Service manual

ManualsBrandsManitowoc ManualsAir CompressorJ-1300

J Model

Service

Manual

 1997 Manitowoc Ice, Inc.

Part No. 83-5631-9

Rev A 8/97

Ice Machines

Summary of content (165 pages)

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Ice Machines J Model Service Manual  1997 Manitowoc Ice, Inc. Part No.
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Safety Notices Procedural Notices As you work on a J-Series Ice Machine, be sure to pay close attention to the safety notices in this manual. Disregarding the notices may lead to serious injury and/or damage to the ice machine. As you work on a J-Series Ice Machine, be sure to read the procedural notices in this manual. These notices supply helpful information which may assist you as you work.
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Table of Contents Section 1 - Warranty Coverage..............................................................................................................................................................1-1 Section 2 - Installation References (Refer to Installation Manual for complete Installation Guidelines) Dimensions Ice Machines...................................................................................................................................................2-1 Ice Storage Bins........
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Table of Contents (cont.) Section 3 - Maintenance Component Identification..................................................................................................................................3-1 Operational Checks Water Level Check.........................................................................................................................................3-2 Ice Thickness Check............................................................................................................
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Table of Contents (cont.) Section 6 - Electrical System Energized Parts Charts Self-Contained Air- and Water-Cooled Models.............................................................................................6-1 Remote Models ..............................................................................................................................................6-2 Wiring Diagram Sequence of Operation Self-Contained Models...........................................................................
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Table of Contents (cont.) Section 6 - Electrical System (cont.) Component Specifications and Diagnostics Fuses.............................................................................................................................................................6-36 Bin Switch ....................................................................................................................................................6-36 Compressor Electrical Diagnostics ..........................................
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Table of Contents (cont.) Section 7 - Refrigeration System Sequence of Operation Self-Contained Air- or Water-Cooled Models ...............................................................................................7-1 Remote Models ..............................................................................................................................................7-3 J1300/J1800 Refrigeration Tubing Schematics......................................................................................
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Table of Contents (cont.) Section 7 - Refrigeration System (cont.) Pressure Control Specifications and Diagnostics Fan Cycle Control ........................................................................................................................................7-30 High Pressure Cutout (HPCO) Control........................................................................................................7-30 Cycle Time/24 Hour Ice Production/Refrigerant Pressure Charts J200 ...........................
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Section 1 Warranty Section 1 Warranty Coverage GENERAL The following Warranty outline is provided for your convenience. For a detailed explanation, read the warranty bond shipped with each product. Contact your local Manitowoc representative or Manitowoc Ice, Inc. if you need further warranty information. PARTS 1. Manitowoc warrants the ice machine against defects in materials and workmanship, under normal use and service for three (3) years from the date of original installation. 2.
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Warranty Section 1 THIS PAGE INTENTIONALLY LEFT BLANK 1-2
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Section 2 Installation References Section 2 Installation References Refer to Installation Manual for complete installation guidelines Dimensions 7.00 J320/J420 Ice Machine ICE MACHINES J250 Ice Machine 4.50 3.00 1.50 10.00 H 32.50 14.25 3.50 4.00 2.25 6.50 0.63 6.50 SV1270 28.00 0.75 1.75 15.00 30.00 SV1319 22.00 23.50 1.56 H NOTE: All measurements are in inches. 1.56 0.63 4.63 10.00 SV1271 1.25 NOTE: All measurements are in inches. Ice Machine J320 J420 Dimension H 20.00 25.
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Installation References Section 2 J200-J1000 Ice Machines J1300/J1800 Ice Machines 23.50 48.25 H 5.00 3.25 2.75 3.00 4.00 6.25 10.13 29.75 10.00 17.50 H SV1181 SV1500 23.50 30.00 23.50 48.25 1.56 1.25 H 19.25 2.88 9.88 0.75 1.56 C 1.75 SV1501 SV1180 NOTE: All measurements are in inches. NOTE: All measurements are in inches. Ice Machine J200 J450 J600 J800 J1000 2-2 Dimension H 16.50 20.00 20.00 25.00 28.00 Dimension C 7.25 10.50 10.50 10.50 10.
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Section 2 Installation References ICE STORAGE BINS C730 Ice Storage Bin C170/C400/C470/C570 Ice Storage Bins 42.00 30.00 40.00 B 6.75 16.00 6.50 4.25 31.50 14.00 14.00 SV1497 A SV1187 Bin Model C170 C400 C470 C570 Dimension A 28.25 34.00 29.50 34.00 Dimension B 19.06 31.37 44.00 44.00 C970 Ice Storage Bin 48.25 44.00 C320/C420 Ice Storage Bins 22.00 6.75 B 17.00 4.25 52.00 SV1296 6.50 17.00 11.00 A SV1272 NOTE: All measurements are in inches. Bin Model C320 C420 Dimension A 34.
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Installation References deflector is compatible with Manitowoc ice machines.
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Section 2 Installation References Dual Circuit Condenser - DC0862 REMOTE CONDENSERS JC0495/JC0895/JC1095/JC1395 Condensers OPTIONAL 38.00 34.00 30.00 29.50 27.94 1.50 3.38 OPTIONAL 47.25 43.25 39.25 35.25 31.25 24.00 22.40 OPTIONAL 19.69 15.69 11.69 3.91 8.56 6.34 OPTIONAL 20.00 16.00 12.00 29.16 3.50 8.50 29.16 6.00 4.00 6.34 8.50 6.50 14.69 14.62 29.30 SV1578 SV1297 JC1895 Remote Condenser OPTIONAL 47.25 43.25 39.25 35.25 31.25 29.16 29.50 27.94 3.91 8.56 6.34 1.
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Installation References Location of Ice Machine A Manitowoc ice machine operates most efficiently when it is: 1. Located Away From Heat Sources Do not install the ice machine near heatgenerating equipment or in an area of direct sunlight. Air Temperature Around Ice Machine Minimum Maximum 35°F (1.7°C) 110°F (43.3°C) CAUTION The ice machine must be protected if it will be subjected to temperatures below 32°F (0°C). Failure caused by exposure to freezing temperatures is not covered by the warranty.
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Section 2 Installation References Electrical Fuse Size/Circuit Ampacity WARNING All electrical work, including wire routing and grounding, must conform to local, state and national electrical codes. VOLTAGE The maximum allowable voltage variation is +/- 10% of the rated voltage, at start-up (when the electrical load is the highest). MINIMUM CIRCUIT AMPACITY The minimum circuit ampacity is used to help select the wire size of the electrical supply. (It is NOT the ice machine’s running amp load.
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Section 2 Installation References J320/J420 Ice Machines Ice Machine J320 J420 Voltage, Phase, Cycle 115/1/60 208-230/1/60 230/1/50 115/1/60 208-230/1/60 230/1/50 Air-Cooled Maximum Minimum Circuit Fuse/Circuit Amps Breaker 15 11.3 15 4.8 15 4.6 20 12.7 15 7.8 15 5.7 Water-Cooled Maximum Minimum Circuit Fuse/Circuit Amps Breaker 15 10.9 15 4.2 15 4.0 20 11.8 15 7.4 15 5.
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Installation References Section 2 Electrical Wiring Connections Self Contained Ice Machine 208-230/3/60 L SELF-CONTAINED ELECTRICAL CONNECTIONS WARNING These diagrams are not intended to show proper wire routing, wire sizing, disconnects, etc., only the correct wire connections. 1 L1 L2 L2 L3 L3 GROUND All electrical work, including wire routing and grounding, must conform to local, state and national electrical codes.
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Section 2 Installation References Remote Ice Machine With Single Circuit Model Condenser 208-230/3/60 or 380-415/3/50 REMOTE ELECTRICAL CONNECTIONS WARNING These diagrams are not intended to show proper wire routing, wire sizing, disconnects, etc., only the correct wire connections. L1 SINGLE CIRCUIT REMOTE CONDENSER NOTE: FAN MOTOR IS 208-230V L2 GROUND All electrical work, including wire routing and grounding, must conform to local, state and national electrical codes.
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Installation References Section 2 Water Connections and Drains CAUTION Plumbing must conform to local and state codes. Location Ice making water inlet Ice making water drain Condenser water inlet Condenser Water Drain Bin Drain 1 Water Temperature 33°F (0.6°C) min. 90°F (32.2°C) max Water Pressure 20 psi min. 80 psi max Female Pipe Fitting (F.P.T.)1 Size Tube Size Up to Ice Machine Fitting 3/8” F.P.T. 3/8” - - 1/2” F.P.T. 1/2” 33°F (0.6°C) min. 90°F (32.2°C) max 20 psi min.
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Section 2 Installation References Cooling Tower Applications (Water-Cooled Models) A water cooling tower installation does not require modification of the ice machine. The water regulator valve for the condenser continues to control the refrigeration discharge pressure. It is necessary to know the amount of heat rejection, and the pressure drop through the condenser and water valves (inlet and outlet) when using a cooling tower on an ice machine. • Water entering the condenser must not exceed 90°F (32.
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Installation References Section 2 Remote Condenser/Line Set Installation Ice Machine J490 J690 J890 J1090 J1390 J1890 *Line Set RT RL Remote Single Circuit Condenser JC0495 JC0895 JC1095 JC1395 JC1895 Discharge Line 1/2” (12.7 mm) 1/2” (12.7 mm) Line Set* RT-20-R404A RT-35-R404A RT-50-R404A RL-20-R404A RL-35-R404A RL-50-R404A Typical Additional Refrigerant Label Liquid Line 5/16” (7.9 mm) 3/8” (9.5 mm) If remote line set length is between 50’ and 100’ (15.25-30.5 m), add 1.5 lb (24 oz) (0.
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Section 2 Installation References ROUTING LINE SETS General Condensers must be mounted horizontally with the fan motor on top. Remote condenser installations consist of vertical and horizontal line set distances between the machine and the condenser. When combined, they must fit within approved specifications. The following guidelines, drawings and calculation methods must be followed to verify a proper remote condenser installation.
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Installation References Section 2 Make the following calculations to make sure the line set layout is within specifications. CALCULATING REMOTE CONDENSER INSTALLATION DISTANCES 1. Insert the measured rise into the formula below. Multiply by 1.7 to get the calculated rise. Line Set Length The maximum length is 100’ (30.5 m). (Example: A condenser located 10 feet above the ice machine has a calculated rise of 17 feet.) The ice machine compressor must have the proper oil return.
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Section 2 Installation References SINGLE CIRCUIT REMOTE CONDENSER ELECTRICAL DISCONNECT DISCHARGE LINE LIQUID LINE NOTE: BORE A 2.5” DIAMETER HOLE IN THE ROOF OR WALL FOR TUBING. SEAL WITH TAR OR PITCH. SLOPE TO PREVENT ENTRANCE OF MOISTURE ELECTRICAL DISCONNECT ICE MACHINE ELECTRICAL SUPPLY 36.
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Installation References Section 2 Usage With Non-Manitowoc Multi-Circuit Condensers WARRANTY 1. The sixty (60) month compressor warranty, including the thirty-six (36) month labor replacement warranty, shall not apply when the remote ice machine is not installed within the remote specifications outlined in the Installation Manual. 2. The foregoing warranty shall not apply to any ice machine installed and/or maintained inconsistent with the technical instructions provided by Manitowoc Ice, Inc.. 3.
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Section 2 Installation References INTERNAL CONDENSER VOLUME The multi-circuit condenser internal volume must not be less, nor greater, than that used by Manitowoc. CAUTION Do not exceed internal volume and try to add charge to compensate. Compressor failure will result. CONDENSER ∆T ∆T is the difference in temperature between the condensing refrigerant and the entering air.
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Installation References THIS PAGE INTENTIONALLY LEFT BLANK 2-18 Section 2
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Section 3 Maintenance Section 3 Maintenance Component Identification CONDENSER FAN (AIR-COOLED MODELS) HOT GAS VALVE AIR CONDENSER CONDENSER WATER REGULATING VALVE REMOTE COUPLINGS WATER DUMP VALVE COMPRESSOR DRAIN HOSE DISTRIBUTION TUBE ICE THICKNESS PROBE WATER COOLED MODEL WATER CONDENSER SV1206 EVAPORATOR HIGH PRESSURE CUTOUT/ MANUAL RESET ICE/OFF/CLEAN SWITCH WATER PUMP WATER CURTAIN WATER TROUGH FLOAT VALVE BIN SWITCH SV1205 Component Identification (Typical Q450 Shown) 3-1
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Maintenance Section 3 Operational Checks Manitowoc ice machines are factory-operated and adjusted before shipment. Normally, new installations do not require any adjustment. To ensure proper operation, always follow the Operational Checks: • when starting the ice machine for the first time • after a prolonged out of service period • after cleaning and sanitizing NOTE: Routine adjustments and maintenance procedures are not covered by the warranty. WATER LEVEL CHECK 1.
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Section 3 Maintenance Cleaning the Condenser WARNING Disconnect electric power to the ice machine and the remote condenser at the electric service switch before cleaning the condenser. AIR-COOLED CONDENSER (SELF-CONTAINED AND REMOTE MODELS) A dirty condenser restricts airflow, resulting in excessively high operating temperatures. This reduces ice production and shortens component life. Clean the condenser at least every six months. Follow the steps below. 3.
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Maintenance WATER-COOLED CONDENSER AND WATER REGULATING VALVE Symptoms of restrictions in the condenser water circuit include: • Low ice production • High water consumption • High operating temperatures • High operating pressures 3-4 Section 3 If the ice machine is experiencing any of these symptoms, the water-cooled condenser and water regulating valve may require cleaning due to scale build-up. The cleaning procedures require special pumps and cleaning solutions.
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Section 3 Maintenance Interior Cleaning and Sanitizing GENERAL Clean and sanitize the ice machine every six months for efficient operation. If the ice machine requires more frequent cleaning and sanitizing, consult a qualified service company to test the water quality and recommend appropriate water treatment or installation of AuCS accessory (Automatic Cleaning System). If required, an extremely dirty ice machine may be take apart for cleaning and sanitizing.
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Maintenance Section 3 SELF SANITIZING PROCEDURE Use sanitizer to remove algae or slime. Do not use it to remove lime scale or other mineral deposits. Step 1 Set the toggle switch to the OFF position after ice falls from the evaporator at the end of a Harvest cycle. Or, set the switch to the OFF position and allow the ice to melt off the evaporator. CAUTION Never use anything to force ice from the evaporator. Damage may result. Step 2 To start self-sanitizing, place the toggle switch in the CLEAN position.
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Section 3 AUCS  ACCESSORY This accessory monitors ice making cycles and initiates self-cleaning (or sanitizing) procedures automatically. The AuCS Accessory can be set to automatically clean or sanitize the ice machine every 2, 4, or 12 weeks. CAUTION Refer to the AuCS Accessory Installation - Use and Care Guide for complete details on the installation, operation, maintenance and cautionary statements of this accessory.
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Maintenance REMOVAL OF PARTS FOR CLEANING/SANITIZING 1. Turn off the water supply to the ice machine at the water service valve. WARNING Disconnect electric power to the ice machine at the electric switch box before proceeding. 2. Remove the following parts: • water trough • water curtain • water pump • water distribution tube • ice thickness probe (See the following pages for removal procedures for these parts.) CAUTION Do not mix Cleaner and Sanitizer solutions together.
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Section 3 Maintenance WATER DUMP VALVE The water dump valve normally does not require removal for cleaning. To determine if removal is necessary: 1. Locate the water dump valve. 2. Set the toggle switch to ICE. 3. While the ice machine is in the freeze mode, check the dump valve’s clear plastic outlet drain hose for leakage. DUMP VALVE OUTLET DRAIN HOSE Follow the procedure below to remove the dump valve. WARNING Disconnect the electric power to the ice machine at the electric service switch box. 1.
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Maintenance Section 3 NOTE: During cleaning, do not stretch, damage or remove the spring from the plunger. If it is removed, slide the spring’s flared end into the plunger’s slotted top opening until the spring contacts the plunger spring stop. 5. Remove the tubing from the dump valve by twisting the clamps off. 6. Remove the two screws securing the dump valve and the mounting bracket.
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Section 3 Maintenance ICE THICKNESS PROBE 1. Compress the side of the ice thickness probe near the top hinge pin and remove it from the bracket. WATER TROUGH Water trough removal varies slightly by model. The following procedure is typical. 1. Remove the push-in screws holding the trough in place. DISCONNECT WIRE LEADS COMPRESS HINGE PIN TO REMOVE 1. REMOVE PUSH-IN SCREWS 3. REMOVE TROUGH FROM PEGS ICE THICKNESS PROBE SV1212 2.
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Maintenance Section 3 FLOAT VALVE 1. Turn off the water supply to the ice machine at the water service valve. 2. Turn the splash shield counterclockwise one or two turns. COMPRESSION FITTING WATER CURTAIN 1. Gently flex the curtain in the center and remove it from the right side. WATER INLET TUBE SPLASH SHIELD STEP 1 FILTER SCREEN AND CAP STEP 2 SV1213 Water Curtain Removal 2. Slide the left pin out. SV1217 Float Valve Removal 3. Pull the float valve forward and off the mounting bracket. 4.
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Section 3 Maintenance WATER DISTRIBUTION TUBE 1. Disconnect the water hose from the distribution tube. 4. Disassemble for cleaning. INNER TUBE THUMBSCREW DISTRIBUTION TUBE INNER TUBE THUMBSCREW TAB KEYWAY LOCATING PIN LOCATING HOLE SV1210 Water Distribution Tube Removal 2. Loosen the two thumbscrews which secure the distribution tube. 3. Lift the right side of the distribution tube up off the locating pin, then slide it back and to the right. SV1211 Water Distribution Tube Disassembly A.
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Maintenance Section 3 Water Treatment/Filtration Local water conditions may require the installation of a water treatment system to inhibit scale formation, filter out sediment, and remove chlorine taste and odor. Consult your local distributor for information on Manitowoc’s full line of Tri-Liminator filtration systems. FILTER REPLACEMENT PROCEDURE Tri-Liminator systems include a pre-filter and a primary filter. For maximum filtration efficiency, replace the primary filter cartridge every six months.
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Section 3 Maintenance Removal from Service/Winterization GENERAL Special precautions must be taken if the ice machine is to be removed from service for an extended period of time or exposed to ambient temperatures of 32°F or below. CAUTION If water is allowed to remain in the ice machine in freezing temperatures, severe damage to some components could result. Damage of this nature is not covered by the warranty. WATER-COOLED ICE MACHINES 1. Perform steps 1-6 under “Self-Contained AirCooled Ice Machines.
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Maintenance Section 3 THIS PAGE INTENTIONALLY LEFT BLANK 3-16
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Section 4 Ice Machine Sequence of Operation Section 4 Basic Ice Machine Sequence of Operation Self-Contained Air- and Water-Cooled J200/J250/J320/J420/J450/J600/J800/J1000/J1300/J1800 INITIAL START-UP OR START-UP AFTER AUTOMATIC SHUT-OFF 1. Water Purge Before the compressor starts, the water pump and water dump solenoid are energized for 45 seconds, to completely purge the ice machine of old water. This feature ensures that the ice making cycle starts with fresh water.
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Ice Machine Sequence of Operation Section 4 HARVEST SEQUENCE AUTOMATIC SHUT-OFF 5. Water Purge The water pump continues to run and the water dump valve energizes for 45 seconds, to purge the water in the sump trough. After the 45 second water purge, the water pump and dump valve de-energize. The hot gas valve(s) also opens at the beginning of the water purge, to divert hot refrigerant gas into the evaporator. 7.
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Section 4 Ice Machine Sequence of Operation Remote J450/J600/J800/J1000/J1300/J1800 INITIAL START-UP OR START-UP AFTER AUTOMATIC SHUT-OFF 1. Water Purge Before the compressor starts, the water pump and water dump solenoid are energized for 45 seconds, to completely purge the ice machine of old water. This feature ensures that the ice making cycle starts with fresh water.
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Ice Machine Sequence of Operation Section 4 HARVEST SEQUENCE AUTOMATIC SHUT-OFF 5. Water Purge The water pump continues to run and the water dump valve energizes for 45 seconds, to purge the water in the sump trough. After the 45 second water purge, the water pump and dump valve de-energize. The hot gas valve(s) and HPR solenoid valve also open at the beginning of the water purge. 7.
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Section 5 Water System Ice Making Sequence of Operation Section 5 Water System Ice Making Sequence of Operation NOTE: The sequence of operation is the same for self-contained and remote models. INITIAL START-UP OR START-UP AFTER AUTOMATIC SHUT-OFF 1. Before the ice machine starts, the water pump and water dump solenoid are energized for 45 seconds to purge old water from the water trough. This ensures that the ice-making cycle starts with fresh water. FREEZE CYCLE 2.
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Water System Ice Making Sequence of Operation HARVEST CYCLE 4. The water pump and water dump solenoid are energized for 45 seconds to purge the water from the water trough. 5. After the 45-second purge, the water pump and water dump valve de-energize. Section 5 NOTE: New style control boards have an adjustable water purge in the harvest cycle. This permits a 0 (off), 15, 30 or 45 second purge cycle. AUTOMATIC SHUT-OFF There is no water flow during an automatic shut-off.
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Section 6 Electrical System Section 6 Electrical System Energized Parts Charts SELF-CONTAINED AIR- AND WATER-COOLED MODELS Ice Making Sequence Of Operation Control Board Relays 1 2 Water Pump Hot Gas Valve 4 4A 4B Contactor Coil Compressor Condenser Fan Motor On On On Off Off Off 45 Seconds Off On Off On On May Cycle On/Off 5 Seconds Freeze Sequence Off Off Off On On May Cycle On/Off 30 Seconds 4. Freeze On Off Off On On May Cycle On/Off Until 7 sec.
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Electrical System Section 6 REMOTE MODELS Ice Making Sequence Of Operation Control Board Relays 1 Water Pump 2 a. Hot Gas Valve 3 Water Dump Valve b. 4 4A 4B Contactor Coil Compressor Condenser Fan Motor a. Length Of Time b. HPR Solenoid Start-Up1 Contactor Liquid Line Solenoid On On On Off Off Off 45 Seconds Off On Off On On On 5 Seconds Freeze Sequence Off Off Off On On On 30 Seconds 4. Freeze On Off Off On On On Until 7 sec.
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Section 6 Electrical System Wiring Diagram Sequence of Operation SELF-CONTAINED MODELS Initial Start-Up or Start-Up After Automatic Shut-Off SEE SERIAL PLATE FOR VOLTAGE L2 (N) L1 TB32 (55) TB35 (61) (60) HIGH PRESSURE CUTOUT 1. WATER PURGE Before the compressor starts, the water pump and water dump solenoid are energized for 45 seconds to purge old water from the ice machine. This ensures that the ice-making cycle starts with fresh water. (77) 3 HOT GAS SOLENOID 1 (80) (76) 2 4 TB3 TRANS.
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Electrical System Section 6 Initial Start-Up Or Start-Up After Automatic Shut-Off (cont.) SEE SERIAL PLATE FOR VOLTAGE L2 (N) L1 TB32 2. REFRIGERATION SYSTEM START-UP The compressor starts after the 45-second water purge, and it remains on throughout the Freeze and Harvest cycles. (55) TB35 (61) (60) HIGH PRESSURE CUTOUT (77) 3 HOT GAS SOLENOID 1 (80) (76) 2 4 TRANS.
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Section 6 Freeze Sequence 3. PRE-CHILL To pre-chill the evaporator, the compressor runs for 30 seconds prior to water flow. Electrical System SEE SERIAL PLATE FOR VOLTAGE L2 (N) L1 TB32 (55) TB35 (61) (60) HIGH PRESSURE CUTOUT (77) 3 HOT GAS SOLENOID 1 (80) (76) 2 4 TRANS.
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Electrical System Freeze Sequence (cont.) 4. FREEZE The water pump starts after the 30-second pre-chill. An even flow of water is directed across the evaporator and into each cube cell, where it freezes. Section 6 SEE SERIAL PLATE FOR VOLTAGE L2 (N) L1 TB32 (55) TB35 (61) (60) HIGH PRESSURE CUTOUT (77) 3 HOT GAS SOLENOID 1 4 TB3 TRANS.
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Section 6 Harvest Sequence 5. WATER PURGE The water pump continues to run as the water dump valve energizes for 45 seconds to purge the water from the water trough. Electrical System SEE SERIAL PLATE FOR VOLTAGE L2 (N) L1 TB32 (55) TB35 (61) (60) HIGH PRESSURE CUTOUT (77) 3 HOT GAS SOLENOID 1 4 TB3 TRANS.
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Electrical System Harvest Sequence (cont.) 6. HARVEST The hot gas valve(s) remains open, allowing refrigerant gas to warm the evaporator. This causes the cubes to slide, as a sheet, off the evaporator and into the storage bin. Section 6 SEE SERIAL PLATE FOR VOLTAGE L2 (N) L1 TB32 (55) TB35 (61) (60) HIGH PRESSURE CUTOUT (77) 3 HOT GAS SOLENOID 1 (80) (76) 2 4 TB3 TRANS.
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Section 6 7. Automatic Shut-Off If the storage bin is full at the end of a harvest cycle, the sheet of cubes fails to clear the water curtain and holds it open. After the water curtain is held open for 7 seconds, the ice machine shuts off. Electrical System SEE SERIAL PLATE FOR VOLTAGE L2 (N) L1 TB32 (55) TB35 (61) (60) HIGH PRESSURE CUTOUT (77) 3 HOT GAS SOLENOID 1 4 TRANS.
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Electrical System Section 6 REMOTE MODELS Initial Start-Up Or Start-Up After Automatic Shut-Off SEE SERIAL PLATE FOR VOLTAGE L2 (N) L1 HPR SOLENOID TB32 1. WATER PURGE Before the compressor starts, the water pump and water dump solenoid are energized for 45 seconds to purge old water from the ice machine. This ensures that the ice-making cycle starts with fresh water. (55) (78) TB35 (79) (61) (60) HIGH PRESSURE CUT-OUT (71) 3 (80) HOT GAS SOLENOID 1 (75) (76) 2 (57) TRANS.
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Section 6 Electrical System Initial Start-Up Or Start-Up After Automatic Shut-Off (cont.) 2. REFRIGERATION SYSTEM START-UP The compressor, remote condenser fan motor and liquid line solenoid valve energize after the 45-second water purge, and remain on throughout the Freeze and Harvest cycles. SEE SERIAL PLATE FOR VOLTAGE L2 (N) L1 HPR SOLENOID TB32 (55) (78) TB35 (60) HIGH PRESSURE CUT-OUT (71) 3 (80) HOT GAS SOLENOID 1 (76) 2 (57) TRANS.
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Electrical System Section 6 Freeze Sequence 3. PRE-CHILL To pre-chill the evaporator, the compressor runs for 30 seconds prior to water flow. SEE SERIAL PLATE FOR VOLTAGE L2 (N) L1 HPR SOLENOID TB32 (55) (78) TB35 (79) (61) (60) HIGH PRESSURE CUT-OUT (71) 3 (80) HOT GAS SOLENOID 1 (76) 2 (57) TRANS. TB31 FUSE (75) (98) (99) TB37 (59) (83) (82) LIQUID LINE SOLENOID (73) 1D 1C 1A TB30 TB30 HARVEST LIGHT/ SAFETY LIMIT CODE LIGHT LOW D.C.
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Section 6 Electrical System Freeze Sequence (cont.) 4. FREEZE The water pump starts after the 30-second pre-chill. An even flow of water is directed across the evaporator and into each cube cell, where it freezes. SEE SERIAL PLATE FOR VOLTAGE L2 (N) L1 HPR SOLENOID TB32 (55) (78) TB35 (79) (61) (60) HIGH PRESSURE CUT-OUT (71) 3 (76) 2 (57) TRANS. TB31 FUSE (75) (98) (99) TB37 (59) (83) (82) LIQUID LINE SOLENOID (73) 1D 1C 1A TB30 HARVEST LIGHT/ SAFETY LIMIT CODE LIGHT LOW D.C.
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Electrical System Section 6 Harvest Sequence 5. WATER PURGE The water pump continues to run as the water dump valve energizes for 45 seconds to purge the water from the water trough.
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Section 6 Electrical System SEE SERIAL PLATE FOR VOLTAGE L2 (N) L1 Harvest Sequence (cont.) 6. HARVEST The hot gas valve(s) and HPR solenoid valve remain open, allowing refrigerant gas to warm the evaporator. This causes the cubes to slide, as a sheet, off the evaporator and into the storage bin. HPR SOLENOID TB32 (55) (78) TB35 (79) (61) (60) HIGH PRESSURE CUT-OUT (71) 3 (80) HOT GAS SOLENOID 1 (76) 2 (57) TRANS.
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Electrical System 7. Automatic Shut-Off If the storage bin is full at the end of a harvest cycle, the sheet of cubes fails to clear the water curtain and holds it open. After the water curtain is held open for 7 seconds, the ice machine shuts off. Section 6 SEE SERIAL PLATE FOR VOLTAGE L2 (N) L1 HPR SOLENOID TB32 (55) (78) TB35 (79) (61) (60) HIGH PRESSURE CUT-OUT (71) 3 (76) 2 (57) TRANS.
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Section 6 Electrical System Wiring Diagrams The following pages contain electrical wiring diagrams. Be sure you are referring to the correct diagram for the ice machine which you are servicing. WARNING Always disconnect power before working on electrical circuitry.
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Electrical System Section 6 OLD STYLE SELF-CONTAINED - J200/J250/J320 - 1 PHASE CAUTION: L1 DISCONNECT POWER BEFORE WORKING ON ELECTRICAL CIRCUITRY. NOTE: SEE SERIAL PLATE FOR VOLTAGE L2 (N) DIAGRAM SHOWN DURING FREEZE CYCLE. (61) TB32 (60) (55) (77) TB35 HIGH PRESSUR E CUT- 3 1 HOT GAS SOLENOID 2 (76) 4 DUMP SOLENOID (57) TRANS.
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Section 6 Electrical System OLD STYLE SELF-CONTAINED - J420/J450/J600/J800/J1000 - 1 PHASE L1 CAUTION: DISCONNECT POWER BEFORE WORKING ON ELECTRICAL CIRCUITRY. NOTE: DIAGRAM SHOWN DURING FREEZE CYCLE. TB32 SEE SERIAL PLATE FOR VOLTAGE L2 (N) (55) TB35 (61) (60) HIGH PRESSUR E CUT- (77) 3 1 HOT GAS SOLENOID 2 (76) 4 DUMP SOLENOID (57) TRANS.
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Electrical System Section 6 OLD STYLE SELF-CONTAINED - J800/J1000 - 3 PHASE CAUTION: DISCONNECT POWER BEFORE WORKING ON ELECTRICAL CIRCUITRY. NOTE: DIAGRAM SHOWN DURING FREEZE CYCLE. SEE SERIAL PLATE FOR VOLTAGE L3 L2 L1 TB32 TB35 (61) (55) (60) HIGH PRESSUR E CUT- 3 1 (77) HOT GAS SOLENOID 2 (76) 4 TB37 1C DISCHARGE LINE THERMISTOR (62) (99) (59) (56) TB30 TERMINATES AT PIN CONNECTION (74) (73) 1D 1B LOW D.C.
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Section 6 Electrical System OLD STYLE SELF-CONTAINED - J1300/J1800 - 1 PHASE L1 CAUTION: DISCONNECT POWER BEFORE WORKING ON ELECTRICAL CIRCUITRY. NOTE: DIAGRAM SHOWN DURING FREEZE CYCLE. SEE SERIAL PLATE FOR VOLTAGE L2 (N) RH HOT GAS TB32 TB35 (55) (88) (87) LH HOT GAS SOLENOID (80) (61) (60) HIGH PRESSUR E CUT- (77) 3 1 2 (76) 4 DUMP SOLENOID (57) TRANS.
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Electrical System Section 6 OLD STYLE SELF-CONTAINED - J1300/J1800 - 3 PHASE SEE SERIAL PLATE FOR VOLTAGE L3 L2 L1 CAUTION: DISCONNECT POWER BEFORE WORKING ON ELECTRICAL CIRCUITRY. NOTE: DIAGRAM SHOWN DURING FREEZE CYCLE. RH HOT GAS (88) (87) TB32 TB35 (61) N - 50HZ ONLY (60) HIGH PRESSUR E CUT- (77) 3 1 2 (55) 4 TRANS. FUSE (81) (59) 1D (56) TERMINATES AT PIN CONNECTION (74) CONTACTOR COIL TB30 TB30 HARVEST LIGHT/ SAFETY LIMIT CODE LIGHT LOW D.C.
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Section 6 Electrical System OLD STYLE REMOTE - J450/J600/J800/J1000 - 1 PHASE L1 CAUTION: DISCONNECT POWER BEFORE WORKING ON ELECTRICAL CIRCUITRY. NOTE: DIAGRAM SHOWN DURING FREEZE CYCLE. TB32 TB35 SEE SERIAL PLATE FOR VOLTAGE L2 (N) HPR SOLENOID (78) (79) (55) (61) (60) HIGH PRESSUR E CUTOUT (77) 3 1 HOT GAS SOLENOID 2 (76) 4 DUMP SOLENOID (57) TRANS.
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Electrical System Section 6 OLD STYLE REMOTE - J800/J1000 - 3 PHASE SEE SERIAL PLATE FOR VOLTAGE L3 L2 L1 CAUTION: DISCONNECT POWER BEFORE WORKING ON ELECTRICAL CIRCUITRY. NOTE: DIAGRAM SHOWN DURING FREEZE CYCLE. HPR SOLENOID (78) TB32 TB35 (61) HIGH PRESSUR E CUT- (79) (60) (77) HOT GAS SOLENOID 3 1 2 (55) (80) (76) 4 (57) TB31 TRANS.
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Section 6 Electrical System OLD STYLE REMOTE - J1300/J1800 - 1 PHASE L1 CAUTION: DISCONNECT POWER BEFORE WORKING ON ELECTRICAL CIRCUITRY. NOTE: DIAGRAM SHOWN DURING FREEZE CYCLE. TB32 TB35 SEE SERIAL PLATE FOR VOLTAGE L2 (N) HPR SOLENOID (55) (79) (88) (87) LH HOT GAS SOLENOID (80) RH HOT GAS (61) HIGH PRESSUR E CUT- (78) (60) (77) 3 1 2 (76) 4 (57) TRANS.
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Electrical System Section 6 OLD STYLE REMOTE - J1300/J1800 - 3 PHASE CAUTION: DISCONNECT POWER BEFORE WORKING ON ELECTRICAL CIRCUITRY. NOTE: DIAGRAM SHOWN DURING FREEZE CYCLE. SEE SERIAL PLATE FOR VOLTAGE L3 L2 L1 TB32 TB35 RH HOT GAS (61) HIGH PRESSUR E CUT- N - 50HZ ONLY HPR SOLENOID (78) (79) (88) (87) LH HOT GAS SOLENOID (76) (80) (60) (77) (55) 3 1 2 4 (57) TRANS.
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Section 6 Electrical System NEW STYLE SELF-CONTAINED - J200/J250/J320 - 1 PHASE L1 CAUTION: DISCONNECT POWER BEFORE WORKING ON ELECTRICAL CIRCUITRY. NOTE: DIAGRAM SHOWN DURING FREEZE CYCLE. SEE SERIAL PLATE FOR VOLTAGE L2 (N) (61) (60) TB32 TB35 (55) (77) HOT GAS SOLENOID 3 1 HIGH PRESSUR E CUT- (76) DUMP SOLENOID 2 4 (57) TB31 TRANS.
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Electrical System Section 6 NEW STYLE SELF-CONTAINED - J420/J450/J600/J800/J1000 - 1 PHASE L1 TB32 TB35 CAUTION: DISCONNECT POWER BEFORE WORKING ON ELECTRICAL CIRCUITRY. NOTE: DIAGRAM SHOWN DURING FREEZE CYCLE. SEE SERIAL PLATE FOR VOLTAGE L2 (N) (55) (61) (60) HIGH PRESSUR E CUT- (77) HOT GAS SOLENOID 3 1 (76) 2 (57) TB31 TRANS. (75) DUMP SOLENOID 4 (81) (98) (99) TB37 (59) ICE THICKNESS PROBE (56) 1F (74) TB30 CONTACTOR COIL TB30 CLEAN LIGHT LOW D.C.
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Section 6 Electrical System NEW STYLE SELF-CONTAINED - J800/J1000 - 3 PHASE CAUTION: DISCONNECT POWER BEFORE WORKING ON ELECTRICAL CIRCUITRY. NOTE: DIAGRAM SHOWN DURING FREEZE CYCLE.
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Electrical System Section 6 NEW STYLE SELF-CONTAINED - J1300/J1800 - 1 PHASE L1 CAUTION: DISCONNECT POWER BEFORE WORKING ON ELECTRICAL CIRCUITRY. NOTE: DIAGRAM SHOWN DURING FREEZE CYCLE. SEE SERIAL PLATE FOR VOLTAGE L2 (N) RH HOT GAS TB32 TB35 (55) (88) (87) LH HOT GAS SOLENOID (80) (61) (60) HIGH PRESSUR E CUT- (77) 3 1 2 (76) 4 DUMP SOLENOID (57) (98) TB31 TRANS.
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Section 6 Electrical System NEW STYLE SELF-CONTAINED - J1300/J1800 - 3 PHASE SEE SERIAL PLATE FOR VOLTAGE L3 L2 CAUTION: DISCONNECT POWER BEFORE WORKING ON ELECTRICAL CIRCUITRY. NOTE: DIAGRAM SHOWN DURING FREEZE CYCLE. L1 RH HOT GAS (88) (87) TB32 TB35 (61) (77) 3 1 2 (55) TB31 FUSE (7A) (81) TB30 WATER PUMP (59) TERMINATES AT PIN CONNECTION (73) 1F (56) 1C LOW D.C.
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Electrical System Section 6 NEW STYLE REMOTE - J450/J600/J800/J1000 - 1 PHASE L1 CAUTION: DISCONNECT POWER BEFORE WORKING ON ELECTRICAL CIRCUITRY. NOTE: DIAGRAM SHOWN DURING FREEZE CYCLE. TB32 TB35 SEE SERIAL PLATE FOR VOLTAGE L2 (N) HPR SOLENOID (78) (79) (55) (61) (60) HIGH PRESSUR E CUTOUT (77) 3 1 HOT GAS SOLENOID 2 (76) 4 DUMP SOLENOID (57) TB31 TRANS.
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Section 6 Electrical System NEW STYLE REMOTE - J800/J1000 - 3 PHASE SEE SERIAL PLATE FOR VOLTAGE L3 L2 L1 CAUTION: DISCONNECT POWER BEFORE WORKING ON ELECTRICAL CIRCUITRY. NOTE: DIAGRAM SHOWN DURING FREEZE CYCLE. HPR SOLENOID (78) TB32 TB35 (61) HIGH PRESSUR E CUT- (79) (60) (77) HOT GAS SOLENOID 3 1 2 (55) (80) (76) 4 (57) TB31 TRANS.
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Electrical System Section 6 NEW STYLE REMOTE - J1300/J1800 - 1 PHASE CAUTION: DISCONNECT POWER BEFORE WORKING ON ELECTRICAL CIRCUITRY. NOTE: DIAGRAM SHOWN DURING FREEZE CYCLE. SEE SERIAL PLATE FOR VOLTAGE L2 (N) HPR SOLENOID L1 TB32 TB35 (55) (79) (88) (87) LH HOT GAS SOLENOID (80) RH HOT GAS (61) HIGH PRESSUR E CUT- (78) (60) (77) 3 1 2 (76) 4 (57) TB31 TRANS. (75) (98) (99) TB37 (59) (83) ICE THICKNESS PROBE TB30 1C (74) CONTACTOR COIL (56) TB30 1F CLEAN LIGHT LOW D.C.
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Section 6 Electrical System NEW STYLE REMOTE - J1300/J1800 - 3 PHASE CAUTION: DISCONNECT POWER BEFORE WORKING ON ELECTRICAL CIRCUITRY. NOTE: DIAGRAM SHOWN DURING FREEZE CYCLE. SEE SERIAL PLATE FOR VOLTAGE L3 L2 L1 N - 50HZ ONLY HPR SOLENOID (78) TB32 TB35 RH HOT GAS (61) HIGH PRESSUR E CUT- (79) (88) (87) LH HOT GAS SOLENOID (76) (80) (60) (77) (55) 3 1 2 4 DUMP SOLENOID (98) (57) TB31 TRANS.
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Electrical System Section 6 Component Specifications and Diagnostics FUSES BIN SWITCH Function The control board fuse(s) stops ice machine operation if electrical components fail causing high amp draw. Function Bin switch operation is controlled by movement of the water curtain. The bin switch has two main functions: 1. Terminating the harvest cycle and returning the ice machine to the freeze cycle. Specifications Fuse Main Fuse Transformer Fuse1 1 Specifications 250 Volt, 7 Amp 250 Volt, 60 Hz, .
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Section 6 Electrical System Check Procedure 1. Set the toggle switch to OFF. 2. Watch the bin switch light on the control board. 3. Move the water curtain toward the evaporator. The bin switch must close. The bin switch light “on” indicates the bin switch has closed properly. 4. Move the water curtain away from the evaporator. The bin switch must open. The bin switch light “off” indicates the bin switch has opened properly.
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Electrical System COMPRESSOR ELECTRICAL DIAGNOSTICS The compressor will not start or will trip repeatedly on overload. Check Resistance (Ohm) Values NOTE: Compressor windings can have very low ohm values. Use a properly calibrated meter. Perform the resistance test after the compressor cools. The compressor dome should be cool enough to touch (below 120°F/49°C) to assure that the overload is closed and the resistance readings will be accurate. SINGLE PHASE COMPRESSORS 1.
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Section 6 PTCR DIAGNOSTICS What is a PTCR? A PTCR (or Positive Temperature Coefficient Resistor) is made from high-purity, semi-conducting ceramics. A PTCR is useful because of its resistance versus temperature characteristic. The PTCR has a low resistance over a wide (low) temperature range, but upon reaching a certain higher temperature, its resistance greatly increases, virtually stopping current flow. When the source of heat is removed, the PTCR returns to its initial base resistance.
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Electrical System Section 6 L1 J-Model Automatic Shut-Off and Restart When the storage bin is full at the end of a harvest cycle, the sheet of cubes fails to clear the water curtain and will hold it open. After the water curtain is held open for 7 seconds, the ice machine shuts off. To assure the PTCR has cooled, the ice machine remains off for 3 minutes before it can automatically restart.
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Section 6 Troubleshooting PTCR’s WHY A GOOD PTCR MAY FAIL TO START THE COMPRESSOR The PTCR must be cooled before attempting to start the compressor, otherwise the high starting torque may not last long enough. For example, if the PTCR is properly cooled, say 60°F (15.6°C) when the compressor starts, it will take .25 to 1.0 seconds before its temperature reaches 260°F (126.6°C), and current flow is stopped. If the PTCR is still warm, say 160°F (71.1°C) when the compressor starts, it will take only .125 to .
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Electrical System Section 6 MEASURE OHMS BETWEEN END TABS CHECKING THE PTCR WARNING Disconnect electrical power to the entire ice machine at the building electrical disconnect box before proceeding. 1. Visually inspect the PTCR. Check for signs of physical damage. SV1540 Manitowoc PTCR’s 8505003 & 8504993 NOTE: The PTCR case temperature may reach 210°F (100°C) while the compressor is running. This is normal. Do not change a PTCR just because it is hot. 2.
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Section 6 DISCHARGE LINE THERMISTOR NOTE: The discharge line thermistor is not used on later production J-model ice machines. The part has been removed due to the redundancy of safety limits 3 and 4. Any fault that would stop the ice machine on safety limit 3 or 4 would also stop the ice machine on safety limit 1 or 2. As an example, consider an expansion valve that is overfeeding refrigerant, causing low discharge line temperatures in the harvest cycle. This would stop the ice machine on safety limit 3.
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Electrical System Section 6 Temperature/Resistance Chart As the temperature rises at the thermistor block, the resistance drops. Important If the ohm meter reads “OL”, check the scale setting on the meter before assuming the thermistor is bad. Temperature of Thermistor °F °C 32° 0° (ice water bath) 50° - 60° 10.0° - 15.6° 60° - 70° 15.6° - 21.1° 70° - 80° 21.1° - 26.7° 80° - 90° 26.7° - 32.2° 90° - 100° 32.2° - 37.8° 100° - 110° 37.8° - 43.3° 110° - 120° 43.3° - 48.9° 120° - 130° 48.9° - 54.
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Section 6 CONTROL BOARD RELAYS Function The control board relays energize and de-energize system components. Specifications Relays are not field replaceable. Old and new style control boards use four control board relays. New style control boards have a fifth relay which is not used. Check Procedure To increase relay life, there is a capacitor and a resistor mounted across the relay contacts to reducing arcing. Keep this in mind when measuring voltage through open relay contacts.
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Electrical System Section 6 ELECTRONIC CONTROL BOARD (OLD STYLE) AC LINE VOLTAGE ELECTRICAL PLUG (NUMBERS MARKED ON WIRES) 60 57 61 58 L1 PRIMARY POWER SUPPLY 55 N 115V L2 208-230V 56 MAIN FUSE (7A) TRANSFORMER FUSE (.125A - 60HZ) (.
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Section 6 Electrical System ELECTRONIC CONTROL BOARD (NEW STYLE) AC LINE VOLTAGE ELECTRICAL PLUG (NUMBERS MARKED ON WIRES) 60 57 61 58 55 L1 PRIMARY POWER SUPPLY N 115V L2 208-230V 56 CLEAN LIGHT -- YELLOW MAIN FUSE (7A) LIGHT NOT USED -- GREEN BIN SWITCH LIGHT -- GREEN AUTOMATIC CLEANING SYSTEM (AuCS) ACCESSORY PLUG HARVEST LIGHT/ SAFETY LIMIT CODE LIGHT -- RED ICE THICKNESS PROBE (3/16” CONNECTION) WATER PURGE ADJUSTMENT 1C NOT USED 1F 67 68 62 63 65 DC LOW VOLTAGE ELECTRICAL PLUG (NUMB
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Electrical System Control Board HARVEST INITIATION (ICE THICKNESS PROBE) Manitowoc’s patented solid state electronic sensing circuit assures consistent ice formation. It does not rely on the refrigeration system (pressure), the temperature of the evaporator, or timers. The ice machine must be in the freeze cycle six minutes prior to harvest cycle initiation. See “Freeze Time Lock-In Feature” for details. As the ice forms on the evaporator, water (not ice) will contact the ice thickness probe.
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Section 6 Electrical System Water Curtain Removal The water curtain must be on (bin switch closed) to start ice making. The water curtain can be removed and installed at any time during a freeze cycle without interfering with the electrical control sequence. SAFETY LIMITS In addition to standard safety controls, such as the high pressure cut-out, the control board has built-in safety limits. Old style control boards have four safety limits, while new style control boards have two.
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Electrical System Section 6 Ice Thickness Probe (Harvest Initiation) GENERAL The ice thickness probe has been changed from a dual probe to a single probe. This eliminates the possibility of scale or slime forming between the probes and causing a premature harvest cycle. FREEZE TIME LOCK-IN FEATURE Since original production, the ice machine control system has incorporated a freeze time lock-in feature. This prevents the ice machine from short cycling in and out of harvest.
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Section 6 Electrical System DIAGNOSING PROBE CONTROL CIRCUITRY Ice Machine Cycles Into Harvest Before Water Contact with Probe 1. Disconnect the ice thickness probe from the control board. 2. Bypass the freeze time lock-in feature by moving the ICE/OFF /CLEAN switch to OFF and back to ICE. 3. Wait about 1.5 minutes for water to begin flowing over the evaporator. 4. Monitor the harvestCONTROL light.
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Electrical System Section 6 Ice Machine Does Not Cycle Into Harvest When Water Contacts Probe 1. Bypass the freeze time lock-in feature by moving the ICE/OFF/CLEAN switch to OFF and back to ICE. 2. Clip the leads of a jumper wire onto the ice thickness probe to try to initiate a harvest cycle. 3. Monitor the harvest light.
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Section 6 Electrical System Diagnosing Ice Machine That Will Not Run WARNING High (line) voltage is applied to the control board (terminals #55 and #56) at all times. Removing control board fuses or moving the toggle switch to OFF will not remove the power supplied to the control board. Step Check 1 Verify primary voltage supply to ice machine. 2 Verify the high pressure cut-out is closed. 3 4 5 6 7 Verify main and transformer (if applicable) control board fuses are OK.
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Electrical System Section 6 THIS PAGE INTENTIONALLY LEFT BLANK 6-54
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Section 7 Refrigeration System Section 7 Refrigeration System Sequence of Operation SELF-CONTAINED AIR OR WATER-COOLED MODELS EVAPORATOR HEAT EXCHANGER EXPANSION VALVE HOT GAS SOLENOID VALVE COMPRESSOR STRAINER AIR OR WATER CONDENSER DRIER RECEIVER (WATER COOLED ONLY) HIGH PRESSURE VAPOR HIGH PRESSURE LIQUID LOW PRESSURE LIQUID LOW PRESSURE VAPOR SV1569 Self-Contained Prechill and Freeze Cycle (Models J250/J320/J420/J450/J600/J800/J1000) Prechill Refrigeration Sequence No water flows over the
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Refrigeration System Section 7 EVAPORATOR HEAT EXCHANGER EXPANSION VALVE HOT GAS SOLENOID VALVE COMPRESSOR STRAINER AIR OR WATER CONDENSER DRIER RECEIVER (WATER COOLED ONLY) HIGH PRESSURE VAPOR HIGH PRESSURE LIQUID LOW PRESSURE LIQUID LOW PRESSURE VAPOR SV1570 Self-Contained Harvest Cycle (Models J250/J320/J420/J450/J600/J800/J1000) Harvest Cycle Refrigeration Sequence Hot gas flows through the energized hot gas valve, heating the evaporator.
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Section 7 Refrigeration System REMOTE MODELS EVAPORATOR HEAT EXCHANGER EXPANSION VALVE STRAINER COMPRESSOR HOT GAS SOLENOID VALVE LIQUID LINE SOLENOID VALVE CHECK VALVE HARVEST PRESSURE REGULATING VALVE DRIER REMOTE CONDENSER HARVEST PRESSURE REGULATING SOLENOID VALVE HEAD PRESSURE CONTROL VALVE B R RECEIVER SERVICE VALVE CHECK VALVE C RECEIVER HIGH PRESSURE VAPOR HIGH PRESSURE LIQUID LOW PRESSURE LIQUID LOW PRESSURE VAPOR SV1566 Remote Pre-Chill and Freeze Cycle (Models J450/J600/J800/
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Refrigeration System Section 7 EVAPORATOR HEAT EXCHANGER EXPANSION VALVE STRAINER COMPRESSOR HOT GAS SOLENOID VALVE LIQUID LINE SOLENOID VALVE CHECK VALVE HARVEST PRESSURE REGULATING VALVE DRIER REMOTE CONDENSER HARVEST PRESSURE REGULATING SOLENOID VALVE HEAD PRESSURE CONTROL VALVE B R CHECK VALVE RECEIVER SERVICE VALVE C RECEIVER HIGH PRESSURE VAPOR HIGH PRESSURE LIQUID LOW PRESSURE LIQUID LOW PRESSURE VAPOR SV1567 Remote Harvest Cycle (Models J450/J600/J800/J1000) Harvest Cycle Refriger
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Section 7 Refrigeration System EVAPORATOR HEAT EXCHANGER EXPANSION VALVE STRAINER COMPRESSOR HOT GAS SOLENOID VALVE LIQUID LINE SOLENOID VALVE CHECK VALVE HARVEST PRESSURE REGULATING VALVE DRIER HARVEST PRESSURE REGULATING SOLENOID VALVE REMOTE CONDENSER HEAD PRESSURE CONTROL VALVE B R RECEIVER SERVICE VALVE CHECK VALVE C RECEIVER LIQUID/VAPOR EQUALIZED TO AMBIENT CONDITIONS SV1568 Remote Automatic Shut-Off (Models J450/J600/J800/J1000) Automatic Shut-Off The compressor and liquid line sole
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Refrigeration System Section 7 J1300/J1800 REFRIGERATION TUBING SCHEMATICS EVAPORATOR HEAT EXCHANGE EXPANSION VALVE EXPANSION VALVE HOT GAS SOLENOID VALVES COMPRESSOR STRAINER AIR OR WATER COOLED CONDENSER DRIER CHECK VALVE (J1800 AIR COOLED ONLY) RECEIVER J1300/J1800 Self-Contained Air- or Water-Cooled Models NOTE: The refrigeration sequence for self-contained dual expansion valve ice machines is identical to selfcontained single expansion valve ice machines.
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Section 7 Refrigeration System EVAPORATOR HEAT EXCHANGE EXPANSION VALVE EXPANSION VALVE LIQUID LINE SOLENOID VALVE HOT GAS SOLENOID VALVES COMPRESSOR STRAINER CHECK VALVE REMOTE CONDENSER HARVEST PRESSURE REGULATING VALVE HEAD PRESSURE CONTROL VALVE DRIER CHECK VALVE RECEIVER SERVICE VALVE B R C H.P.R.
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Refrigeration System Section 7 Operational Analysis (Diagnostics) GENERAL When analyzing the refrigeration system, it is important to understand that different refrigeration component malfunctions may cause very similar symptoms. Also, many external factors can make good refrigeration components appear bad. These factors can include improper installation, or water system malfunctions such as hot incoming water supply or water loss.
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Section 7 BEFORE BEGINNING SERVICE Ice machines may experience operational problems only during certain times of the day or night. A machine may function properly while it is being serviced, but malfunctions later. Information provided by the user can help the technician start in the right direction, and may be a determining factor in the final diagnosis. Refrigeration System 2. Refer to the appropriate 24 Hour Ice Production Chart. (These charts begin on page 7-31.
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Refrigeration System INSTALLATION/VISUAL INSPECTION CHECKLIST Possible Problem Ice machine is not level Improper clearance around top, sides and/or back of ice machine Air-cooled condenser filter is dirty Ice machine is not on an independent electrical circuit Water filtration is plugged (if used) Water drains are not run separately and/or are not vented Remote condenser line set is improperly installed Corrective Action Level the ice machine Reinstall according to the Installation Manual Clean the condens
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Section 7 Refrigeration System ICE FORMATION PATTERN Evaporator ice formation pattern analysis is helpful in ice machine diagnostics. 2. Extremely Thin at Evaporator Outlet There is no ice, or a considerable lack of ice formation on the top of the evaporator (tubing outlet). Analyzing the ice formation pattern alone cannot diagnose an ice machine malfunction.
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Refrigeration System Section 7 3. Extremely Thin at Evaporator Inlet There is no ice, or a considerable lack of ice formation on the bottom of the evaporator (tubing inlet). Examples: The ice at the top of the evaporator reaches 1/8” to initiate a harvest, but there is no ice formation at all on the bottom of the evaporator. 5. No Ice Formation The ice machine operates for an extended period, but there is no ice formation at all on the evaporator.
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Section 7 SAFETY LIMITS General In addition to standard safety controls, such as high pressure cut-out, the control board has four built in safety limit controls which protect the ice machine from major component failures. New style control boards have two safety limit controls. Safety Limit #1:If the freeze time reaches 60 minutes, the control board automatically initiates a harvest cycle. If three consecutive 60-minute freeze cycles occur, the ice machine stops.
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Refrigeration System Section 7 Safety Limit #1 Freeze time exceeds 60 minutes for 3 consecutive freeze cycles. Possible Cause Improper installation Water system Electrical system Restricted condenser air flow (air-cooled models) Restricted condenser water flow (water-cooled models) Refrigeration system • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Check/Correct See “Installation/Visual Inspection Checklist” on page 7-10 Low water pressure (20 psi min.
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Section 7 Refrigeration System Safety Limit #2 Harvest time exceeds 3.5 minutes for 3 consecutive harvest cycles.
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Refrigeration System Section 7 Safety Limit #3 Compressor discharge temperature fell below 85°F/29.4°C for 3 consecutive harvest cycles. Possible Cause Improper installation Ice thickness probe Water system - insufficient water flow over evaporator Refrigeration system Thermistor • • • • • • • • • • • • • • • • Check/Correct See “Installation/Visual Inspection Checklist” on page 7-10 Check thickness setting Low water pressure (20 psi min.
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Section 7 HOT GAS VALVE TEMPERATURE CHECK General A hot gas valve requires a critical orifice size. This meters the amount of hot gas flowing into the evaporator during the harvest cycle. If the orifice is even slightly too large or too small, long harvest cycles will result. A too-large orifice causes refrigerant to condense to liquid in the evaporator during the harvest cycle. This liquid will cause compressor damage. A too-small orifice does not allow enough hot gas into the evaporator.
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Refrigeration System SINGLE EXPANSION VALVE ICE MACHINES COMPARING EVAPORATOR INLET AND OUTLET TEMPERATURES NOTE: This procedure will not work on the dual expansion valve J1300 and J1800 ice machines. The temperatures of the suction lines entering and leaving the evaporator alone cannot diagnose an ice machine. However, comparing these temperatures during the freeze cycle, along with using Manitowoc’s Refrigeration System Operational Analysis Table, can help diagnose an ice machine malfunction.
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Section 7 Refrigeration System ANALYZING DISCHARGE PRESSURE DURING FREEZE OR HARVEST CYCLE Procedure 1. Determine the ice machine operating conditions: Air temp. entering condenser ______ Air temp. around ice machine ______ Water temp. entering float valve ______ 2. Refer to Operating Pressure Chart for ice machine being checked. (These charts begin on page 7-31.) Use the operating conditions determined in Step 1 to find the published normal discharge pressures. Freeze Cycle ______ 3.
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Refrigeration System Section 7 ANALYZING SUCTION PRESSURE DURING FREEZE CYCLE The suction pressure gradually drops throughout the freeze cycle. The actual suction pressure (and drop rate) changes as the air and water temperatures entering the ice machine change. This affects freeze cycle times. To analyze and identify the proper suction pressure drop throughout the freeze cycle, compare the published suction pressure to the published freeze cycle time.
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Section 7 Refrigeration System Freeze Cycle Suction Pressure High Checklist Possible Cause Improper installation Discharge pressure Improper refrigerant charge Other • • • • • • • • • Check/Correct See “Installation/Visual Inspection Checklist” on page 7-10 Discharge pressure is too high, and is affecting low side (See “Freeze Cycle Discharge Pressure High Checklist” on page 7-19) Overcharged Wrong type of refrigerant Non-Manitowoc components in system H.P.R.
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Refrigeration System HOW TO USE THE REFRIGERATION SYSTEM OPERATIONAL ANALYSIS TABLES General These tables must be used with charts, checklists and other references to eliminate refrigeration components not listed on the tables and external items and problems which can cause good refrigeration components to appear defective. The tables list five different defects that may affect the ice machine’s operation. NOTE: There are only four columns listed across the top.
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Section 7 Final Analysis Before totaling the four columns, be sure to analyze all detailed charts, checklists, and other references to eliminate external causes which may make a good refrigerant component appear bad. The column with the highest number of check marks identifies the refrigeration problem. Refer to the appropriate heading below. COLUMN 1 - HOT GAS VALVE LEAKING Normally, a leaking hot gas valve can be repaired with a rebuild kit instead of changing the entire valve.
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Refrigeration System Section 7 J Model Single Expansion Valve Refrigeration System Operational Analysis Table This table must be used with charts, checklists and other references to eliminate refrigeration components not listed on the table and external items and problems which can cause good refrigeration components to appear defective.
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Section 7 Refrigeration System J Model Dual Expansion Valve Refrigeration System Operational Analysis Table This table must be used with charts, checklists and other references to eliminate refrigeration components not listed on the table and external items/problems which can cause good refrigeration components to appear defective.
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Refrigeration System Section 7 FREEZE CYCLE The H.P.R. system is not used during the freeze cycle. The H.P.R. solenoid is closed (de-energized), preventing refrigerant flow into the H.P.R. valve. REMOTES ONLY Harvest Pressure Regulating (H.P.R.) System GENERAL The harvest pressure regulating (H.P.R.) system includes: 1. Harvest pressure regulating solenoid valve (H.P.R. solenoid) This is an electrically operated valve which opens when energized, and closes when de-energized.
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Section 7 Refrigeration System H.P.R. SYSTEM FAILURE CHART Freeze Cycle Symptoms The ice machine functions properly. (The H.P.R. solenoid is closed, preventing refrigerant flow into the H.P.R. valve.) Harvest Cycle The discharge pressure is low or normal and the suction pressure is low, which causes extended harvest times. The ice machine usually continues to run, although with extended harvest times, ice production decreases. Possible Causes H.P.R.
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Refrigeration System Section 7 Headmaster Control Valve Manitowoc remote systems require headmaster control valves with special settings. Replace defective headmaster control valves only with “original” Manitowoc replacement parts. OPERATION The R404A headmaster control valve has a nonadjustable setting of 225 PSIG. At ambient temperatures of approximately 70°F (21.1°C) or above, refrigerant flows through the valve from the condenser to the receiver inlet.
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Section 7 LOW ON CHARGE VERIFICATION The remote ice machine requires more refrigerant charge at lower ambient temperatures than at higher temperatures. A low on charge ice machine may function properly during the day, and then malfunction at night. Check this possibility. If you cannot verify that the ice machine is low on charge: 1. Add refrigerant in 2 lb. increments, but do not exceed 6 lbs. 2.
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Refrigeration System Section 7 Pressure Control Specifications and Diagnostics FAN CYCLE CONTROL (Self-Contained Air-Cooled Models Only) HIGH PRESSURE CUTOUT (HPCO) CONTROL Function Cycles the fan motor on and off to maintain proper operating discharge pressure. Function Stops the ice machine if subjected to excessive highside pressure. The fan cycle control closes on an increase, and opens on a decrease in discharge pressure.
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Section 7 Refrigeration System Cycle Time/24 Hour Ice Production/Refrigerant Pressure Charts J200 SERIES WATER-COOLED J200 SERIES SELF-CONTAINED AIR-COOLED NOTE: These characteristics may vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Cycle Time Cycle Times Freeze Time + Harvest Time = Cycle Time Air Temp. Entering Condenser °F/°°C 70/21.1 80/26.7 90/32.2 100/37.8 Freeze Time Water Temperature °F/°°C 50/10.0 11.5-13.5 12.6-14.7 14.5-16.9 17.0-19.8 70/21.1 13.8-16.
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Refrigeration System Section 7 J250 SERIES SELF-CONTAINED AIR-COOLED J250 SERIES WATER-COOLED NOTE: These characteristics may vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Cycle Time Cycle Times Freeze Time + Harvest Time = Cycle Time Air Temp. Entering Condenser °F/°°C 70/21.1 80/26.7 90/32.2 100/37.8 Freeze Time Water Temperature °F/°°C 50/10.0 12.0-14.1 13.1-15.4 14.5-16.9 17.5-20.4 70/21.1 13.8-16.1 15.2-17.8 18.2-21.0 21.2-24.6 90/32.2 16.1-18.7 17.0-19.8 20.
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Section 7 Refrigeration System J320 SERIES SELF-CONTAINED AIR-COOLED J320 SERIES WATER-COOLED NOTE: These characteristics may vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Cycle Time Cycle Times Freeze Time + Harvest Time = Cycle Time Air Temp. Entering Condenser °F/°°C 70/21.1 80/26.7 90/32.2 100/37.8 Freeze Time Water Temperature °F/°°C 50/10.0 11.7-13.4 13.6-15.5 16.1-18.4 19.6-22.3 70/21.1 13.1-14.9 15.1-17.2 18.6-21.2 23.3-26.5 90/32.2 14.7-16.8 17.7-20.2 21.
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Refrigeration System Section 7 J420/450 SERIES SELF-CONTAINED AIR-COOLED J420/450 SERIES WATER-COOLED NOTE: These characteristics may vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Cycle Time Cycle Times Freeze Time + Harvest Time = Cycle Time Air Temp. Entering Condenser °F/°°C 70/21.1 80/26.7 90/32.2 100/37.8 Freeze Time Water Temperature °F/°°C 50/10.0 9.5-11.2 10.4-12.2 12.0-14.0 13.3-15.6 70/21.1 10.9-12.8 12.0-14.1 14.1-16.5 16.0-18.6 90/32.2 12.3-14.4 13.
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Section 7 Refrigeration System J450 SERIES REMOTE NOTE: These characteristics may vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Cycle Time Air Temp. Entering Condenser °F/°°C -20/-28.9 to 70/21.1 80/26.7 90/32.2 100/37.8 110/43.3 Freeze Time Water Temperature °F/°°C 50/10.0 70/21.1 90/32.2 10.9-12.8 12.6-14.8 14.1-16.5 11.1-13.1 11.4-13.4 12.6-14.8 14.1-16.5 13.0-15.2 13.3-15.6 15.0-17.5 17.1-19.9 14.5-17.0 15.0-17.5 17.0-19.9 19.0-22.
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Refrigeration System Section 7 J600 SERIES WATER-COOLED J600 SERIES REMOTE NOTE: These characteristics may vary depending on operating conditions. NOTE: These characteristics may vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Cycle Time Cycle Times Freeze Time + Harvest Time = Cycle Time Air Temp. Around Ice Machine °F/°°C 70/21.1 80/26.7 90/32.2 100/37.8 Freeze Time Water Temperature °F/°°C 50/10.0 8.1-9.5 8.2-9.7 8.4-9.9 8.6-10.1 70/21.1 9.2-10.8 9.4-11.1 9.
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Section 7 Refrigeration System J800 SERIES SELF-CONTAINED AIR-COOLED J800 SERIES WATER-COOLED NOTE: These characteristics may vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Cycle Time Cycle Times Freeze Time + Harvest Time = Cycle Time Air Temp. Entering Condenser °F/°°C 70/21.1 80/26.7 90/32.2 100/37.8 Freeze Time Water Temperature °F/°°C 50/10.0 8.8-10.2 9.4-10.8 10.5-11.5 11.6-13.4 70/21.1 10.3-11.9 11.0-12.7 11.6-13.3 13.6-15.5 90/32.2 11.9-13.6 12.5-14.4 13.
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Refrigeration System Section 7 J800 SERIES REMOTE NOTE: These characteristics may vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Cycle Time Air Temp. Entering Condenser °F/°°C -20/-28.9 to 70/21.1 80/26.7 90/32.2 100/37.8 110/43.3 Freeze Time Water Temperature °F/°°C 50/10.0 70/21.1 90/32.2 8.8-10.2 10.3-11.9 12.1-13.8 8.9-10.3 9.0-10.3 9.7-11.1 10.9-12.5 10.4-12.0 10.5-12.1 11.4-13.1 13.6-15.5 12.2-14.0 12.3-14.1 13.6-15.5 15.0-17.
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Section 7 Refrigeration System J1000 SERIES WATER-COOLED J1000 SERIES REMOTE NOTE: These characteristics may vary depending on operating conditions. NOTE: These characteristics may vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Cycle Time Cycle Times Freeze Time + Harvest Time = Cycle Time Air Temp. Around Ice Machine °F/°°C 70/21.1 80/26.7 90/32.2 100/37.8 Freeze Time Water Temperature °F/°°C 50/10.0 8.8-9.5 8.9-9.6 8.9-9.6 9.0-9.7 70/21.1 10.1-10.9 10.2-11.0 10.
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Refrigeration System Section 7 J1300 SERIES SELF-CONTAINED AIR-COOLED J1300 SERIES WATER-COOLED NOTE: These characteristics may vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Cycle Time Cycle Times Freeze Time + Harvest Time = Cycle Time Air Temp. Entering Condenser °F/°°C 70/21.1 80/26.7 90/32.2 100/37.8 Freeze Time Water Temperature °F/°°C 50/10.0 8.8-9.8 9.1-10.1 9.8-10.9 10.8-12.0 70/21.1 10.2-11.4 10.5-11.7 11.4-12.6 12.8-14.2 90/32.2 11.5-12.8 12.0-13.3 13.
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Section 7 Refrigeration System J1300 SERIES REMOTE NOTE: These characteristics may vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Cycle Time Air Temp. Entering Condenser °F/°°C -20/-28.9 to 70/21.1 80/26.7 90/32.2 100/37.8 110/43.3 Freeze Time Water Temperature °F/°°C 50/10.0 70/21.1 90/32.2 9.2-10.2 10.5-11.7 11.8-13.2 9.4-10.4 9.5-10.6 10.1-11.3 11.0-12.3 10.7-11.9 10.9-12.2 11.6-12.9 12.8-14.2 12.0-13.4 12.2-13.6 13.0-14.5 14.5-16.
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Refrigeration System Section 7 J1800 SERIES WATER-COOLED J1800 SERIES REMOTE NOTE: These characteristics may vary depending on operating conditions. NOTE: These characteristics may vary depending on operating conditions. Cycle Times Freeze Time + Harvest Time = Cycle Time Cycle Times Freeze Time + Harvest Time = Cycle Time Air Temp. Around Ice Machine °F/°°C 70/21.1 80/26.7 90/32.2 100/37.8 Freeze Time Harvest Time Water Temperature °F/°°C 50/10.0 8.8-9.7 8.9-9.9 9.0-10.0 9.2-10.1 70/21.1 10.
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Section 7 Refrigeration System THIS PAGE INTENTIONALLY LEFT BLANK 7-43
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Refrigeration System Section 7 Refrigerant Recovery/Evacuation and Recharging NORMAL SELF-CONTAINED MODEL PROCEDURES Refrigerant Recovery/Evacuation Do not purge refrigerant to the atmosphere. Capture refrigerant using recovery equipment. Follow the manufacturer’s recommendations. Important Manitowoc Ice, Inc. assumes no responsibility for the use of contaminated refrigerant. Damage resulting from the use of contaminated refrigerant is the sole responsibility of the servicing company.
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Section 7 Refrigeration System . Self-Contained Charging Procedures Important The charge is critical on all Manitowoc ice machines. Use a scale or a charging cylinder to ensure the proper charge is installed. 1. Be sure the toggle switch is in the OFF position. MANIFOLD SET CLOSED OPEN FRONTSEATED BACKSEATED LOW SIDE SERVICE VALVE HIGH SIDE SERVICE VALVE CHARGING CYLINDER VACUUM PUMP/ RECOVERY UNIT CLOSED OPEN SV1404B Charging Connections 2.
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Refrigeration System NORMAL REMOTE MODEL PROCEDURES Refrigerant Recovery/Evacuation Do not purge refrigerant to the atmosphere. Capture refrigerant using recovery equipment. Follow the manufacturer’s recommendations. Important Manitowoc Ice, Inc. assumes no responsibility for the use of contaminated refrigerant. Damage resulting from the use of contaminated refrigerant is the sole responsibility of the servicing company. Important Replace the liquid line drier before evacuating and recharging.
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Section 7 Refrigeration System HEAT EXCHANGER EVAPORATOR EXPANSION VALVE HOT GAS SOLENOID VALVES LOW SIDE SERVICE VALVE (BACKSEATED) STRAINER COMPRESSOR HARVEST PRESSURE REGULATING VALVE HARVEST PRESSURE SOLENOID VALVE LIQUID LINE SOLENOID CHECK VALVE HIGH SIDE SERVICE VALVE (BACKSEATED) DISCHARGE LINE QUICK CONNECT SCHRAEDER FITTING DRIER REMOTE CONDENSER RECEIVER SERVICE VALVE (HALF OPEN) B CHECK VALVE R C HEAD PRESSURE CONTROL VALVE TEE MANIFOLD SET OPEN OPEN OPEN VACUUM PUMP/ RECOVER
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Refrigeration System Section 7 Remote Charging Procedures NOTE: Backseat the receiver outlet service valve after 1. Be sure the toggle switch is in the OFF position. charging is complete and before operating the ice 2. Close the vacuum pump valve, the low and high machine. If the access valve core removal and side service valves (frontseat), and the low side installation tool is used on the discharge quickmanifold gauge valve. connect fitting, reinstall the Schraeder valve core 3.
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Section 7 Refrigeration System HEAT EXCHANGER EVAPORATOR EXPANSION VALVE HOT GAS SOLENOID VALVES LOW SIDE SERVICE VALVE (BACKSEATED) STRAINER COMPRESSOR HARVEST PRESSURE REGULATING VALVE HARVEST PRESSURE SOLENOID VALVE LIQUID LINE SOLENOID CHECK VALVE HIGH SIDE SERVICE VALVE (BACKSEATED) DISCHARGE LINE QUICK CONNECT SCHRAEDER FITTING DRIER REMOTE CONDENSER RECEIVER SERVICE VALVE (HALF OPEN) B CHECK VALVE R C HEAD PRESSURE CONTROL VALVE TEE MANIFOLD SET CLOSED OPEN CLOSED VACUUM PUMP/ REC
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Refrigeration System Section 7 SYSTEM CONTAMINATION CLEANUP General This section describes the basic requirements for restoring contaminated systems to reliable service. Important Manitowoc Ice, Inc. assumes no responsibility for the use of contaminated refrigerant. Damage resulting from the use of contaminated refrigerant is the sole responsibility of the servicing company.
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Section 7 Mild System Contamination Cleanup Procedure 1. Replace any failed components. 2. If the compressor is good, change the oil. 3. Replace the liquid line drier. NOTE: If the contamination is from moisture, use heat lamps during evacuation. Position them at the compressor, condenser and evaporator prior to evacuation. Do not position heat lamps too close to plastic components, or they may melt or warp. Important Dry nitrogen is recommended for this procedure. This will prevent CFC release. 4.
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Refrigeration System 11. Follow the normal evacuation procedure, except replace the evacuation step with the following: Important Dry nitrogen is recommended for this procedure. This will prevent CFC release. A. Pull vacuum to 1000 microns. Break the vacuum with dry nitrogen and sweep the system. Pressurize to a minimum of 5 psi. B. Change the vacuum pump oil. C. Pull vacuum to 500 microns. Break the vacuum with dry nitrogen and sweep the system. Pressurize to a minimum of 5 psi. D.
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Section 7 Refrigeration System FIG. A - “PINCHING OFF” TUBING TYPICAL PRESSURE CONTROL SHOWN “PINCH-OFF” TOOL USED HERE SEE FIG. A AND FIG. B FIG.
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Refrigeration System Section 7 FILTER-DRIERS The filter-driers used on Manitowoc ice machines are manufactured to Manitowoc specifications. The difference between Manitowoc driers and offthe-shelf driers is in filtration. Manitowoc driers have dirt-retaining filtration, with fiberglass filters on both the inlet and outlet ends. This is very important because ice machines have a back-flushing action which takes place during every harvest cycle.
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Section 7 REFRIGERANT DEFINITIONS Recover To remove refrigerant, in any condition, from a system and store it in an external container, without necessarily testing or processing it in any way. Recycle To clean refrigerant for re-use by oil separation and single or multiple passes through devices, such as replaceable core filter-driers, which reduce moisture, acidity and particulate matter. This term usually applies to procedures implemented at the field job site or at a local service shop.
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Refrigeration System REFRIGERANT RE-USE POLICY Manitowoc recognizes and supports the need for proper handling, re-use, and disposal of, CFC and HCFC refrigerants. Manitowoc service procedures require recapturing refrigerants, not venting them to the atmosphere. It is not necessary, in or out of warranty, to reduce or compromise the quality and reliability of your customers’ products to achieve this. Important Manitowoc Ice, Inc. assumes no responsibility for use of contaminated refrigerant.
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Section 7 HFC REFRIGERANT QUESTIONS AND ANSWERS Manitowoc uses R-404A and R-134A HFC refrigerants with ozone depletion potential (ODP) factors of zero (0.0). R-404A is used in ice machines and reach-in freezers and R-134A is used in reach-in refrigerators. 1. What compressor oil does Manitowoc require for use with HFC refrigerants? Manitowoc products use Polyol Ester (POE) type compressor oil. It is the lubricant of choice among compressor manufacturers. 2.
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Refrigeration System 7. Is other special equipment required to service HFC refrigerants? No. Standard refrigeration equipment such as gauges, hoses, recovery systems, vacuum pumps, etc., are generally compatible with HFC refrigerants. Consult your equipment manufacturer for specific recommendations for converting existing equipment to HFC usage. Once designated (and calibrated, if needed) for HFC use, this equipment should be used specifically with HFC refrigerants only. Section 7 8.
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MANITOWOC ICE, INC. 2110 South 26th Street P.O. Box 1720 Manitowoc, WI 54221-1720 Phone: (920) 682-0161 Service Fax: (920) 683-7585 Web Site: http://www.manitowoc.com ã1997 Manitowoc Ice, Inc. Litho in U.S.A.