ROTARY SCREW LIQUID CHILLERS INSTALLATION, OPERATION, MAINTENANCE Supersedes: 160.81-NOM2 (605) Form 160.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 IMPORTANT! READ BEFORE PROCEEDING! GENERAL SAFETY GUIDELINES This equipment is a relatively complicated apparatus. During installation, operation maintenance or service, individuals may be exposed to certain components or conditions including, but not limited to: refrigerants, materials under pressure, rotating components, and both high and low voltage. Each of these items has the potential, if misused or handled improperly, to cause bodily injury or death.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 CHANGEABILITY OF THIS DOCUMENT In complying with Johnson Controls’ policy for continuous product improvement, the information contained in this document is subject to change without notice. Johnson Controls makes no commitment to update or provide current information automatically to the manual owner. Updated manuals, if applicable, can be obtained by contacting the nearest Johnson Controls Service office.
FORM 160.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 TABLE OF CONTENTS SECTION 1 – INSTALLATION...................................................................................................................................9 General.............................................................................................................................................................. 9 Construction Drawings............................................................................................................
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 TABLE OF CONTENTS (CONT'D) Capacity Control ............................................................................................................................................. 51 Need For Maintenance Or Service.................................................................................................................. 52 Normal Safety Shutdown and Repairs....................................................................................................
FORM 160.
FORM 160.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 SECTION 1 – INSTALLATION 1 GENERAL INSTALLATION RESTRICTIONS This instruction describes the installation of a Model YR Rotary Screw Liquid Chiller. The standard unit is shipped as a single factory assembled, piped, wired and nitrogen or refrigerant charged package. This unit requires a minimum of field labor to make chilled water connections, condenser water connections, refrigerant atmospheric relief connections, and electrical power connections.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 SECTION 1 – INSTALLATION INSPECTION – DAMAGE – SHORTAGE CLEARANCE FOR SERVICE REQUIREMENTS The unit shipment should be checked on arrival to see that all major pieces, boxes and crates are received. Each unit should be checked on the trailer when received, before unloading, for any visible signs of damage. Any damage or signs of possible damage must be reported to the transportation company immediately for their inspection.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 SECTION 1 – INSTALLATION If optional shipping skids are used, remove them before lowering the unit to its mounting position. Rig the unit to its final location on the floor or mounting pad by lifting the unit (or shell assembly) with an overhead lift and lower the unit to its mounting position. Units shipped dismantled should be assembled under the supervision of a Johnson Controls representative.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 SECTION 1 – INSTALLATION Table 3 - UNIT WEIGHTS COMP.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 SECTION 1 – INSTALLATION TABLE 3 - UNIT WEIGHTS (CONT'D) COMP.
FORM 160.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 SECTION 1 – INSTALLATION OVERALL DIMENSIONS 1 Table 4 - OVERALL DIMENSIONS EVAPORATOR – CONDENSER SHELL CODES DIM.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 SECTION 1 – INSTALLATION LOCATING AND INSTALLING ISOLATOR PADS The isolator pads should be located in accordance with the floor layout of the dimensional product drawing, Form 160.81-PA1. After the isolator pads have been placed into position on the floor, lower the unit onto the pads. Make sure the pads are even with the edges of the mounting feet.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 SECTION 1 – INSTALLATION 1 FLOOR LAYOUT CL EVAPORATOR CL SHELLS END SHEET END SHEET DIMENSION "C" From Figure 2 (pages 12 and 13) CL CONDENSER 22 mm DIA. HOLE 76.2 SUPPORT FOOT 152.4 76.2 25 203.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 SECTION 1 – INSTALLATION INSTALLING OPTIONAL SPRING ISOLATORS When ordered, 4 spring type isolator assemblies will be furnished with the unit. The 4 assemblies are identical and can be placed at any of the 4 corners of the unit. While the unit is still suspended by the rigging, the isolators should be bolted to the unit by inserting the cap screw(s) through the hole(s) in the mounting bracket into the tapped hole in the top of the isolator leveling bolt(s).
FORM 160.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 SECTION 1 – INSTALLATION SHIPPING FORM 2, 3, 7, AND 8 This instruction explains the procedure to be used for reassembling the Model YR Rotary Screw Chiller shipped disassembled. (Shipping Form 3, 7, and 8.) Units MUST be field reassembled under the supervision of a Johnson Controls service representative. FORMS OF SHIPMENT FORM 2 – FACTORY ASSEMBLED (STANDARD) – Unit completely assembled except not charged with oil or refrigerant. Standard oil shipped separately.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 When more than one unit is involved, the major parts of each unit will be marked to prevent mixing of assemblies. (Piping and Wiring Drawings to be furnished by Johnson Controls.) All openings on compressor, oil separator and shells are closed and charged with dry nitrogen [5 psig (34 kPa)].
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 SECTION 1 – INSTALLATION Evaporator-Condenser Shells – Remove all refrigerant connection covers. Shells are shipped with a 5 psig (34 kPa) nitrogen charge. 4. Place gasket on the evaporator suction flange and lower the compressor assembly. Guide the studs through the gasket and suction flange on top of evaporator. (Refer to Figure 9 on page 23.) 5. Insert the cap screws, washers, and nuts to fasten the motor to the motor support bracket. Level the compressor-motor.
FORM 160.
SECTION 1 – INSTALLATION Form 7 Shipment 1. Locate evaporator and condenser shells in their final position. 2. Remove shipping closures from the flanges on refrigerant line on bottom of evaporator and condenser. (Shells are shipped with a holding charge of nitrogen.) Discard gaskets. Install orifice plate using new gaskets and 3/4" x 3" long cap screws and nuts. 3. Bolt tube sheets together using cap screws, lock washers and nuts. (Refer to Figure 10 on page 24) 4. Assemble vibration isolators to the unit.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 9. Assemble nuts to studs on the evaporator suction flange. Tighten nuts alternately and evenly, to insure a leak tight fit. 10. Remove the hoist from the compressor-motor assembly. 11. Place gasket on the condenser discharge connection and then place the condenser shut-off valve on the discharge connection. Make sure the handle of the shut-off valve is perpendicular to the condenser shell. Place gasket on the top side of the shut-off valve. 12.
SECTION 1 – INSTALLATION Figure 11 - FORM 7 FIELD ASSEMBLY – EXPLODED VIEW 26 FORM 160.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 SECTION 1 – INSTALLATION Form 8 Shipment Table 7 - FORM 8 FIELD ASSEMBLY PARTS 1. Assemble vibration isolators to the unit. (Refer to Locating And Installing Isolator Pads on page 16 of this manual) ITEM NO. DESCRIPTION 1 COMPRESSOR WITH MOTOR 2 GASKET 2. Level shells in both directions. The longitudinal alignment of the shell should be checked by placing a level on the top of the shell, next to the discharge connection.
SECTION 1 – INSTALLATION FORM 160.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 VACUUM DEHYDRATION To obtain a sufficiently dry system, the following instructions have been assembled to provide an effective method for evacuating and dehydrating a system in the field. Although there are several methods of dehydrating a system, we are recommending the following, as it produces one of the best results, and affords a means of obtaining accurate readings as to the extent of dehydration.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 SECTION 1 – INSTALLATION Table 9 - SYSTEM PRESSURES *GAUGE ABSOLUTE INCHES OF MERCURY (HG) BELOW ONE STANDARD ATMOSPHERE PSIA MILLIMETERS OF MERCURY (HG) MICRONS 0 14.696 760 760,000 212 (100) 10.24* 9.629 500 500,000 192 (89) BOILING TEMPERATURES OF WATER °F 22.05* 3.865 200 200,000 151 (66) 25.98* 1.935 100 100,000 124 (51) 27.95* .968 050 050,000 101 (38) 28.94* .481 025 025,000 078 (25) 29.53* .
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 PIPING CONNECTIONS After the unit is leveled (and wedged in place for optional spring isolators) the piping connections may be fabricated; chilled water, condenser water and refrigerant relief. The piping should be arranged with offsets for flexibility, and adequately supported and braced independently of the unit to avoid strain on the unit and vibration transmission. Hangers must allow for alignment of pipe.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 SECTION 1 – INSTALLATION drive coolant temperature, fail-closed, and set for a temperature above dewpoint. It can be requested as factorysupplied on a chiller order by special quotation. System Turnover Rate (STR) = Chilled Water Circuit As noted previously, if the STR is above 15 minutes, chilled water flow rate of change is 15 minutes.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 SECTION 1 – INSTALLATION 1 LD07069 Figure 14 - SCHEMATIC OF A TYPICAL PIPING ARRANGEMENT Condenser Water Circuit For proper operation of the unit, condenser refrigerant pressure must be maintained above evaporator pressure. If operating conditions will fulfill this requirement, no attempt should be made to control condenser water temperature by means of automatic valves, cycling of the cooling tower fan or other means.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 SECTION 1 – INSTALLATION Cooling Tower Roof Sump w/ Strainer 3-Way Diverting Valve Alternate Bypass Condenser Gauges Controller LD10024 Figure 15 - COOLING TOWER PIPING WITH 3 PORT BY-PASS VALVE Stop Valves Checking Piping Circuits and Venting Air Stop valves may be provided (by others) in the evaporator and condenser water piping, adjacent to the unit to ease maintenance.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 REFRIGERANT RELIEF PIPING Each unit is equipped with relief device(s) on the evaporator, condenser and oil separator for the purpose of quickly relieving excess pressure of the refrigerant charge to the atmosphere in case of an emergency. The relief valve is furnished in accordance with American Society of Heating, Refrigeration and Air Conditioning Engineers Standard 15 (ASHRAE 15) and set to relieve at 235 PSIG (1621 kPa).
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 SECTION 1 – INSTALLATION Table 11 - REFRIGERANT RELIEF CHARACTERISTICS EVAPORATOR C SHELL CODE SINGLE RELIEF VALVE CR OUTLET CR OUTLET NPT LBS. AIR PER MIN. (kPa) NPT 1-11-1/2 (FEM) 55.9 (385.4) 1-11-1/2 (FEM) LBS. AIR PER MIN. (kPa) T 34.7 (239.3) 55.9 (385.4) DUAL RELIEF VALVE1 V 48.5 (334.4) 55.9 (385.4) 1-11-1/2 (FEM) 55.9 (385.4) 1-11-1/2 (FEM) W 48.0 (330.9) 91.8 (632.9) 1-1/4 - 11-1/2 (FEM) 91.8 (632.9) 1-1/4 - 11-1/2 (FEM) X 64.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 SECTION 1 – INSTALLATION To ensure proper motor rotation, the starter power input and starter to motor connections must be checked with a phase sequence indicator in the presence of the Johnson Controls Representative. IMPORTANT: DO NOT cut wires to final length or make final connections to motor terminals or starter power input terminals until approved by the Johnson Controls Representative.
Supersedes: 160.81-CL1 (801) FORM 160.
INSTRUCTIONS FOR USE OF FORM JOHNSON CONTROLS REGIONAL OR DISTRICT SERVICE OFFICE 1 1. Fill in the blanks at the top of the form. * To: (Service Managers Name and Johnson Controls office address) JOHNSON CONTROLS TELEPHONE NO. JOB NAME LOCATION CUSTOMER ORDER NO. JOHNSON CONTROLS ORDER NO. JOHNSON CONTROLS CONTRACT NO. SYSTEM MODEL NO. 2. Completely rule out or “XXXX” out items on check list that do NOT apply to this specific job. (Review Para. A-1, A-2, D-lb, D-2, D-3, E, E-1, E-2, E-3, E-4, and E-5). 3.
FORM 160.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 SECTION 2 – CHILLER COMMISSIONING OPTIVIEW CONTROL CENTER Refer to Operator's Manual (Form 160.81-O1) and Service Manual (Form 160.81-M1) for more information concerning the OptiView Control Center. YR CHILLERS PRE-STARTUP CHECKLIST Installation Check all utility interconnections to the chiller: water piping, electrical and control wiring to the chiller. Verify that the chiller is level. Check the mounting spring isolators or vibration isolators for equal loading.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 SECTION 2 – CHILLER COMMISSIONING START-UP 1. If the chilled water pump is manually operated, start the pump – the OptiView Control Center will not allow the chiller to start unless chilled liquid flow is established through the unit. (A field installed chilled water flow switch is required.) If the chilled liquid pump is wired to the OptiView Control Center the pump will automatically start; therefore, this step is not necessary. 2.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 SECTION 2 – CHILLER COMMISSIONING Leak Check (Visual) Maintenance Thoroughly check all fittings and connections for oil and refrigerant leaks. CUSTOMER (OPERATING PERSONNEL) INSTRUCTION Operation Instruct the customer or operating personnel on the location of all controls and the operation of the OptiView Control Center. Review the maintenance schedule with the customer.
FORM 160.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 SECTION 3 – OPERATION BASIC DESCRIPTION Oil Separator The YORK YR Chiller package uses a refrigerantflooded evaporator and a liquid-cooled condenser. The compressor is a heavy-duty, industrial-rated rotary screw compressor. The YR package consists of five major components – Driveline, Oil Separator, Condenser, Evaporator and OptiView™ Control Center. The oil separator removes the oil that was injected into the compressor. The oil separator is a two stage design.
SERVICE CONNECTION EVAPORATOR RELIEF VALVE VALVE STOP ANGLE VERTICAL RELIEF VALVE VALVE STOP ANGLE VERTICAL FILTER DRYER DRIVELINE OIL SEPARATOR VARIABLE ORIFICE INSERT 1 LD07961 SECTION 3 – OPERATION FORM 160.
FORM 160.
SECTION 3 – OPERATION FORM 160.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 Variable Orifice Since liquid refrigerant is transferred from the Condenser to the Evaporator via the Condenser-Evaporator pressure differential, a large differential can create an excess refrigerant level in the evaporator. A small differential can result in insufficient level in the Evaporator. To maintain an appropriate refrigerant level in the Evaporator under all conditions, the chiller is equipped with a variable orifice.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 SECTION 3 – OPERATION The oil leaving the oil eductor manifold block flows into the compressor to lubricate the compressor bearings. All of the oil that is injected into the compressor mixes with refrigerant gas during compression. The oil and refrigerant gas is discharged into the oil separator, where it is separated and returned to the oil sump. A high discharge temperature safety is located in the discharge line, between the compressor and oil separator.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 SECTION 3 – OPERATION Oil-rich refrigerant flows into the eductor block through the filter drier from the evaporator. The oil rich refrigerant mixes with the discharge pressure gas and flows into the compressor suction line. The filter driers should be changed annually or when excessive amount of oil is indicated in the refrigerant charge.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 SECTION 3 – OPERATION NEED FOR MAINTENANCE OR SERVICE If the system is malfunctioning in any manner, or the unit is stopped by one of the safety controls, please call the nearest Johnson Controls Service Office. Failure to report constant troubles could damage the unit and increase the cost of repairs considerably.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 STOPPING THE SYSTEM The OptiView™ Control Center can be programmed to start and stop automatically (maximum, once each day) whenever desired. 1. Push the COMPRESSOR “STOP/RESET” switch. The Control Center Display will show: SYSTEM LOCKOUT DELAY This prevents compressor restart until system equalization is achieved. 2. Stop the chilled water pump (if not wired into the Control Center, in which case it will shut off automatically). 3.
FORM 160.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 SECTION 4 – OPERATING INSPECTIONS GENERAL Weekly By following a regular inspection using the display readings of the OptiView Control Center, and maintenance procedure, the operator will avoid serious operating difficulty. The following list of inspections and procedures should be used as a guide. Check the Refrigerant charge. Daily 1. Check OptiView Control Center displays. 2. If the compressor is in operation, check the bearing oil pressure.
FORM 160.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 SECTION 5 – MAINTENANCE GENERAL The maintenance requirements for YR Chillers is shown below. The procedure is given in the left- hand column and the frequency required is marked with an “X” shown in the right-hand columns. Refer to the note at the bottom of the form to maintain warranty validation.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 SECTION 5 – MAINTENANCE COMPRESSOR OIL CHARGING UNIT WITH OIL Yearly oil analysis is recommended to verify the continued use of the compressor oil. The Oil Charge It is very important to take the oil sample after the oil filter. The oil sample should not be left open to the atmosphere for more than 15 minutes since it will absorb moisture from the atmosphere and may yield erroneous results.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 SECTION 5 – MAINTENANCE water loop. This can cause refrigerant in the oil separator to condense, creating a liquid level (oil and refrigerant mixture) that exceeds the top of the upper sight glass. When the chiller motor is not running, a qualified technician should confirm that the oil heater is in proper working condition and is energized.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 SECTION 5 – MAINTENANCE 4. As soon as oil charging is complete, close the power supply to the starter to energize the oil heater. This will keep the concentration of refrigerant in the oil to a minimum. Oil Charging Procedure The oil should be charged into the oil separator using the YORK Oil Charging Pump – YORK Part No. 07010654. To charge oil, proceed as follows: 5. The immersion oil heater will maintain the oil temperature between 105°F (40°C) and 115°F (46°C).
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 SECTION 5 – MAINTENANCE The YORK control panel will automatically display the message “DIRTY OIL FILTER” when the differential pressure reaches 15 PSID across the oil filter. A safety shutdown will be initiated if the oil pressure differential pressure reaches 25 PSID. The control panel will display the message “CLOGGED OIL FILTER” OIL FILTER REPLACEMENT Single Oil Filter The chiller must be OFF.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 SECTION 5 – MAINTENANCE DETERMINING CORRECT REFRIGERANT CHARGE LEVEL The refrigerant charge level is correct when the measured evaporator approach and discharge refrigerant gas superheat are within the values listed in Table 17 on page 62. IMPORTANT: The chiller must be at design operating conditions and full load operation before the correct refrigerant charge level can be properly determined. Liquid refrigerant will be visible in the evaporator sight glass.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 CONDENSERS AND EVAPORATORS General Maintenance of condenser and evaporator shells is important to provide trouble free operation of the unit. The water side of the tubes in the shell must be kept clean and free from scale. Proper maintenance such as tube cleaning, and testing for leaks, is covered on the following pages.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 SECTION 5 – MAINTENANCE When chemical cleaning of the condenser tubes is required, it may be necessary to calculate the internal volume of the waterside condenser tubes. This information is necessary to properly mix the correct concentration of cleaning solution. Standard materials of construction for YORK YR Chiller condensers is copper tubes and mild carbon steel water boxes.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 SECTION 5 – MAINTENANCE LD00475 Figure 26 - DIAGRAM, MEGOHM MOTOR WINDINGS MEGOHM THE MOTOR Make certain that the motor disconnect switch (circuit breaker) is in the open position. Megohm the motor as follows: 1. Use a megohm meter to verify the minimum motor and wiring insulation resistance. Megohm between phases and each phase to ground, Refer to Figure 26 on page 65, Diagram, Megohm Motor Windings. 2.
SECTION 5 – MAINTENANCE and tube sheets may be considered tight. If refrigerant is detected at the vents, the heads must be removed, the leak located (by means of soap test or leak detector) and repaired. 5. When absolute tightness of the system has been established, blow the mixture of nitrogen and refrigerant through the charging valve.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 SECTION 5 – MAINTENANCE pumps are stopped. The level should be at the center of the upper sight glass. connecting the other end by means of a hose to the water supply. Charge the refrigerant in accordance with the method shown under “Refrigerant Charging.” The refrigerant level should be observed and the level recorded after initial charging. The tubes should always be brush cleaned before acid cleaning.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 SECTION 5 – MAINTENANCE location is not definite, all the tubes will require investigation). 2. Wash off both tube heads and the ends of all tubes with water. Do not use carbon tetrachloride for this purpose since its fumes give the same flame discoloration that the refrigerant does. 3. With nitrogen or dry air, blow out the tubes to clear them of traces of refrigerant laden moisture from the circulation water.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 Compressor 1. Oil Filter – The oil filter must be changed when the oil pressure drops 30% or semiannually if not required earlier. When the oil filter is changed, it should be inspected thoroughly for any metal particles which would indicate possible bearing wear. If metal particles are found this should be brought to the attention of the nearest Johnson Controls Service Office for their further investigation and recommendations. 2.
FORM 160.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 SECTION 6 – TROUBLESHOOTING When an operating problem develops, compare all operating information on the OPERATING DISPLAY with normal operating conditions. If an Operating Log has been maintained, the log can help determine what constitutes normal operation for the compressor unit in that particular system. TROUBLESHOOTING GUIDE Successful problem solving requires an organized approach to define the problem, identify the cause, and make the proper correction.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 SECTION 6 – TROUBLESHOOTING TABLE 18 – OPERATING ANALYSIS CHART (CONT'D) RESULTS POSSIBLE CAUSE REMEDY 2. SYMPTOM: ABNORMALLY LOW SUCTION PRESSURE Temperature difference between leaving chilled water and refrigerant in evaporator greater than normal with high discharge temperature. Insufficient charge of refrigerant. Check for leaks and charge refrigerant into system. Flow orifice blocked. Remove obstruction.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 SECTION 6 – TROUBLESHOOTING PRESSURE/TEMPERATURE CONVERSION TABLES The numbers in bold‑face type in the center column refer to the temperature, either in Centigrade or Fahrenheit, which is to be converted to the other scale. Converting Fahrenheit to Centigrade the equivalent tem- perature will be found in the left column. If converting Centigrade to Fahrenheit, the equivalent temperature will be found in the column on the right.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 SECTION 6 – TROUBLESHOOTING TEMPERATURE CONVERSION TABLES The numbers in bold‑face type in the center column refer to the temperature, either in Centigrade or Fahrenheit, which is to be converted to the other scale. Converting Fahrenheit to Centigrade the equivalent tem°C -40.0 -39.4 -38.9 -38.3 -37.8 -37.2 -36.7 -36.1 -35.6 -35.0 -34.4 -33.9 -33.3 -32.8 -32.2 -31.7 -31.1 -30.6 -30.0 -29.4 -28.9 -28.3 -27.8 -27.2 -26.7 -26.1 -25.6 -25.0 -24.4 -23.9 -23.3 -22.8 -22.
FORM 160.81-NOM2 ISSUE DATE: 2/29/2012 The following factors can be used to convert from English to the most common SI Metric values. Table 19 - SI METRIC CONVERSION MEASUREMENT MULTIPLY ENGLISH UNIT BY FACTOR TO OBTAIN METRIC UNIT Capacity Tons Refrigerant Effect (ton) 3.516 Kilowatts (kW) Power Horsepower 0.7457 Kilowatts (kW) Flow Rate Gallons / Minute (gpm) 0.0631 Liters / Second (l/s) Feet (ft) 304.8 Meters (m) Inches (in) 25.4 Millimeters (mm) Weight Pounds (lbs) 0.
P.O. Box 1592, York, Pennsylvania USA 17405-1592 Copyright © by Johnson Controls 2011 Form 160.81-NOM2 (212) Issue Date: February 29, 2012 Supersedes: 160.81-NOM2 (605) 800-861-1001 www.johnsoncontrols.com Subject to change without notice.
