Service Instructions Goodman® & Amana® Brand 33 3/8" 80% Modified Two Stage Gas Furnaces AMH8, GMH8, GDH8, ADSH8 & Accessories This manual is to be used by qualified, professionally trained HVAC technicians only. Goodman does not assume any responsibility for property damage or personal injury due to improper service procedures or services performed by an unqualified person.The material in this manual does not supercede manufacturer’s installation and operation instructions.
TABLE OF CONTENTS IMPORTANT INFORMATION ..........................2 - 3 SYSTEM OPERATION ....................................... 39 PRODUCT IDENTIFICATION ........................4 - 10 TROUBLESHOOTING ................................ 40 - 41 ACCESSORIES ........................................... 11 - 15 MAINTENANCE ........................................... 42 - 45 OPERATING INSTRUCTIONS .................... 16 - 18 SERVICING .................................................
IMPORTANT INFORMATION Special Warning for Installation of Furnace or Air Handling Units in Enclosed Areas such as Garages, Utility Rooms or Parking Areas Carbon monoxide producing devices (such as an automobile, space heater, gas water heater, etc.) should not be operated in enclosed areas such as unventilated garages, utility rooms or parking areas because of the danger of carbon monoxide (CO) poisoning resulting from the exhaust emissions.
PRODUCT IDENTIFICATION The model and manufacturing number are used for positive identification of component parts used in manufacturing. Please use these numbers when requesting service or parts information.
PRODUCT IDENTIFICATION MODEL# MFG.# DESCRIPTION GDH8**CA GDH80453A* GDH80703A* GDH80904B* GDH81155C* Goodman® Brand 80% Modified Tw o-Stage Gas Furnace, Dedicated down flow installation, 33 3/8" tall, Induced draft, Two stage gas Valve, Integrated circuit board controlling 2nd stage gas val ve by time. Left or right side ga s entry. Alumini zed steel heat excha nger. PSC blower motor. 115 volt silico n nitride ign iter. "X" models are low NOx. Chassis sizes are 14", 17.5" and 2 1" wide.
PRODUCT IDENTIFICATION 6 MODEL # MFG.# DESCRIPTION GMH8**CA GMH80453A* GMH80703A* GMH80704B* GMH80903B* GMH80904C* GMH80905C* GMH81155C* GMH81405D* Goodman® Brand 80% Modified Two-Stage Gas Furnace, Upflow/Horizontal Left and Right installation, 33 3/8" tall, Induced draft, Two stage gas Valve, Integrated circuit board controlling 2nd stage gas valve by time. Left or right side gas entry. Aluminized steel heat exchanger. PSC blower motor. 115 volt silicon nitride igniter. "X" models are low NOx.
PRODUCT IDENTIFICATION MODEL# MFG.# DESCRIPTION AMH8**CA AMH80453A* AMH80703A* AMH80704B* AMH80903B* AMH80904C* AMH80905C* AMH81155C* AMH81405D* Amana® Brand 80% Modified Two-Stage Gas Furnace, Upflow/Horizontal Left and Right installation, 33 3/8" tall, Two tone painted cabinet. Induced draft, Two stage gas Valve, Integrated circuit board controlling 2nd stage gas valve by time. Left or right side gas entry. Stainless steel heat exchanger. PSC blower motor. 115 volt silicon nitride igniter.
PRODUCT IDENTIFICATION 8 MODEL# MFG.# ADSH80***AA ADSH800403AX* ADSH800603AX* ADSH800804CX* ADSH801005CX* DESCRIPTION Amana® Brand 80% Modified Two-Stage Ga s Furnace, Dedicated down flow instal lation, 33 3/8" tall, Two tone painted cabinet. Induced draft, Two stage gas Valve, Integrated circuit board control ling 2nd stage gas valve by time. Left or right side gas en try. Stainless steel heat exchanger. PSC blower motor. 115 volt silicon nitride igniter. "X" mo dels are low NOx.
PRODUCT IDENTIFICATION MODEL # MFG # DESCRIPTION AFE18-60A N/A Fossil Fuel Kit. The AFE18-60A control is d esigned for use where the indo or coil is lo cated above/d ownstream of a gas or fossil fuel furnace when used with a heat p ump. It will operate with sing le and two stage heat pumps and single and two stage furna ces. The AFE18-60A control wi ll turn the he at pump unit off when the furnace is turned on.
PRODUCT IDENTIFICATION MODEL # LPLP03 LPT-06 MVK-01A MVK-02A SBT14 SBT17 SBT21 10 MFG # DESCRIPTION N/A LP Gas Low Pressure Kit. Designed for application on gas fired furnace products installed on LP gas listed in this manual. This kit includes harness adaptors to work with White-Rodgers single & two stage gas valves,Honeywell single and two-stage gas valves, as well as modulating gas valves. N/A LP Conversion Kit. This kit converts only two-stage gas fired units from natural to propane gas.
ACCESSORIES ® G DH8 10 0 5 C** · (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (2 ) (3 ) (4 ) (2 ) (3 ) (4 ) (2 ) (3 ) (4 ) (2 ) (3 ) (4 ) (2 ) (3 ) (4 ) (2 ) (3 ) (4 ) · · · · · · · (5 ) (5 ) (4 ) (2 ) (3 ) (4 ) (2 ) (3 ) (4 ) (2 ) (3 ) (4 ) (2 ) (3 ) FSRKG24 Sound Reduction Kit FSRKG21 Sound Reduction Kit FSRKG17 Sound Reduction Kit FSRKG14 Sound Reduction Kit MVK-02 HANG21 High Altitude Orifices W/Pressure Switch (4 ) Masonry Vent Kit HANG20 High Altitude Ori
ACCESSORIES ® · 12 (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (2 ) (3 ) (4 ) (2 ) (3 ) (4 ) (2 ) (3 ) (4 ) (2 ) (3 ) (4 ) (2 ) (3 ) (4 ) (2 ) (3 ) (4 ) · · · · · · · (5 ) (5 ) · · · · not approved for this model approved for this model (1) W/R & HW 2 stg valve (2) BA REV 4,500 - 10,000 FT (excluding AMH81205D*BA) (3) BB REV 5,500 - 10,000 FT (4) AA Rev (5) AMH81205D*BA and AMH81405D*CE 5,500 FT - 10,000 FT FSRKG24 Sound Reduction Kit FSRKG21 Sound Reduction Kit FSRKG17 Sound
ACCESSORIES EXTERNAL FILTER RACK KIT ( EFR01 ) SLOTS IN FILTER CLEAR SCREWS ON UNIT BLOWER DECK SCREWS UNIT SIDE PANEL FRONT OF UNIT FILTER RACK ASSEMBLY (FACE FILTER OPENING TOWARDS FRONT OF UNIT) BASE OF UNIT RETURN AIR CUTOUT AREA LOWER EDGE SCREW EFR01 EXTERNAL FILTER RACK KIT Used on Models 80% Upflow Model Furnaces 13
ACCESSORY WIRING DIAGRAMS HIGH VOLTAGE! DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
ACCESSORY WIRING DIAGRAMS HIGH VOLTAGE! DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH. FURNACE TWINING KIT - FTK04 (UTEC Control Board) This wiring diagram is for reference only. Not all wiring is as shown above. Refer to the appropriate wiring diagram for the unit being serviced.
OPERATING INSTRUCTIONS FOR YOUR SAFETY READ BEFORE OPERATING If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or loss of life. A. This appliance does not have a pilot. It is equipped with an ignition device which automatically lights the burners. Do not try to light the burners by hand. B. BEFORE OPERATING smell around the appliance area for gas.
OPERATING INSTRUCTIONS CONSIGNES DE SECURITE - LIRE AVANT D'ALLUMER L'APPAREIL INSTRUCTIONS DE SERVICE AVERTISSEMENT: Le non-respect des instructions qui suivent peut ^ entrainer un risque d'incendie ou d'explosion causant des dommages, des blessures ou la mort. A. Cet appareil comporte pas de veilleuse. Il est muni d'un mecanisme qui allume ^ ^ manuellement. automatiquement le bruleur. N'allumez paz le bruleur B. Sentir tout autour de l'appariel AVANT D'ALLUMER afin de deceler toute fuite de gaz.
OPERATING INSTRUCTIONS ROBINET A GAZ MANUEL, EN POS "ON/MARCHE" GAS INLET ARRIVEE DU GAZ MANUAL GAS LEVER SHOWN IN "ON" POS 18
PRODUCT DESIGN Safety Please adhere to the following warnings and cautions when installing, adjusting, altering, servicing, or operating the furnace. WARNING TO PREVENT PERSONAL INJURY OR DEATH DUE TO IMPROPER INSTALLATION, ADJUSTMENT, ALTERATION, SERVICE OR MAINTENANCE, REFER TO THIS MANUAL. FOR ADDITIONAL ASSISTANCE OR INFORMATION, CONSULT A QUALIFIED INSTALLER, SERVICE AGENCY OR THE GAS SUPPLIER.
PRODUCT DESIGN CSA International 8501 East Pleasant Valley Cleveland, OH 44131 • A copy of the CAN/CGA B149 Installation Codes can be obtained from: CSA International 178 Rexdale Boulevard Etobicoke, Ontario, Canada M9W, 1R3 The rated heating capacity of the furnace should be greater than or equal to the total heat loss of the area to be heated.
PRODUCT DESIGN als, a minimum of 24 inches service clearance must be available in front of the unit. A furnace installed in a confined space (i.e., a closet or utility room) must have two ventilation openings with a total minimum free area of 0.25 square inches per 1,000 BTU/ hr of furnace input rating. One of the ventilation openings must be within 12 inches of the top; the other opening must be within 12 inches of the bottom of the confined space.
PRODUCT DESIGN COMBUSTION AND VENTILATION AIR REQUIREMENTS WARNING POSSIBLE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH MAY OCCUR IF THE FURNACE IS NOT PROVIDED WITH ENOUGH FRESH AIR FOR PROPER COMBUSTION AND VENTILATION OF FLUE GASES. MOST HOMES REQUIRE OUTSIDE AIR BE SUPPLIED TO THE FURNACE AREA. Improved construction and additional insulation in buildings have reduced heat loss by reducing air infiltration and escape around doors and windows.
PRODUCT DESIGN Chimney or Gas Vent Chimney or Gas Vent NOTE: Each opening must have a free area of not less than one square inch per 1000 BTU of the total input rating of all equipment in the enclosure, but not less than 100 square inches. Ventilation louvers (each end of attic) NOTE: The inlet and outlet air openings must each have a free area of not less than one square inch per 4000 BTU of the total input rating of all equipment in the enclosure.
PRODUCT DESIGN NOTE: The single opening must have a free area of not less than one square inch per 3000 BTU of the total input rating of all equipment in the enclosure, but not less than the sum of the areas of all vent connectors in the confined space. each opening. Where the free area through a design of louver or grille or screen is known, it shall be used in calculating the size opening required to provide the free area specified.
PRODUCT DESIGN Category I Venting (Vertical Venting) (80% Furnaces Only) WARNING WARNING TO PREVENT DEATH OR SERIOUS ILLNESS TO BUILDING OCCUPANTS DUE TO FLUE PRODUCTS LEAKING INTO THE BUILDING, PROPER INSTALLATION OF TO PREVENT POSSIBLE PERSONAL INJURY OR DEATH DUE TO GASKETS AND SCREWS IS ESSENTIAL FOR PROVIDING A GAS TIGHT SEAL ASPHYXIATION, NON-CONDENSING GAS FIRED WARM AIR FURNACES MUST BETWEEN THE PARTITION PANEL AND THE INDUCED DRAFT BLOWER. CATEGORY I VENTED.
PRODUCT DESIGN Checklist Summary This checklist serves as a summary of the items to be checked before venting an 80% furnace into a masonry chimney. In addition, we recommend that a qualified serviceman use this checklist to perform a yearly inspection of the furnace venting system. This checklist is only a summary. For detailed information on each of the procedures mentioned, see the paragraph referenced with each item.
PRODUCT DESIGN Check 2 - Any solid or liquid fuel appliances vented into this chimney channel. Solid fuel appliances include fireplaces, wood stoves, coal furnaces, and incinerators. Liquid fuel appliances include oil furnaces, oil-fired boilers and oil-fired water heaters. Appliances which burn propane (sometimes referred to as LP (liquefied petroleum)) gas are considered gas-fired appliances. Check 3 - Chimney Crown Condition. Damage from condensate usually shows up first in the crown.
PRODUCT DESIGN Check 7 - Complete the Installation. If Checks 1 through 6 have been satisfactory, and the liner is an acceptable size as determined by the tables in National Fuel Gas Code NFPA 54/ANSI Z223.1 - latest edition and in the National Standard of Canada, CAN/CGA B149.1 and CAN/CGA B149.2 - latest editions and amendments, then the clay tile liner can probably be used as a vent for the gas appliances.
PRODUCT DESIGN To install the liner, read and follow the liner manufacturer’s instructions and your local codes. Excess liner length should be pulled out of the chimney and cut off. Use caution when doing this, as the cut edges of flexible liners may be sharp. Do not spiral excess liner inside of the chimney. Support the liner as recommended by the liner manufacturer. Some manufacturers of flexible liners offer an insulation sleeve designed to be added to the liner before it is installed in the chimney.
PRODUCT DESIGN High altitude kits are purchased according to the installation altitude and usage of either natural or propane gas. Refer to the product Specification Sheet or Technical Manual for a tabular listing of appropriate altitude ranges and corresponding manufacturer’s high altitude (Natural, Propane gas, and/or Pressure Switch) kits. Do not derate the furnace by adjusting the manifold pressure to a lower pressure than specified on the furnace rating plate.
PRODUCT DESIGN 4. Install a drip leg to trap dirt and moisture before it can enter the gas valve. The drip leg must be a minimum of three inches long. 5. Install a 1/8" NPT pipe plug fitting, accessible for test gage connection, immediately upstream of the gas supply connection to the furnace. 6. Use two pipe wrenches when making connection to the gas valve to keep it from turning. The orientation of the gas valve on the manifold must be maintained as shipped from the factory. 7.
PRODUCT DESIGN All propane gas equipment must conform to the safety standards of the National Board of Fire Underwriters, NBFU Manual 58. For satisfactory operation, propane gas pressure must be 11 inch WC at the furnace manifold with all gas appliances in operation. Maintaining proper gas pressure depends on three main factors: 1. Vaporization rate, depending on temperature of the liquid, and “wetted surface” area of the container or containers. 2. Proper pressure regulation.
PRODUCT DESIGN Refer to the wiring diagram for wire routings. If any of the original wire as supplied with the furnace must be replaced, it must be replaced with wiring material having a temperature rating of at least 105° C. Any replacement wiring must be copper conductor. Sizing Between Second or Second Stage Regulator & Appliance* Maximum Propane Capacities listed are based on 1/2" W.C. pressure drop at 11" W.C. setting. Capacities in 1,000 BTU/hour.
PRODUCT DESIGN 115 VOLT LINE CONNECTION OF ACCESSORIES (HUMIDIFIER AND ELECTRONIC AIR CLEANER) WARNING HIGH VOLTAGE DISCONNECT ALL POWER BEFORE SERVICING OR CHANGING ANY ELECTRICAL WIRING. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH. Some furnaces have an integrated ignition control that is equipped with line voltage accessory terminals for controlling power to an optional field-supplied humidifier and/or electronic air cleaner.
PRODUCT DESIGN A return air filter is not supplied with the furnace. The installer must supply a means of filtering all of the return air. Filter(s) shall comply with UL900 or CAN/ULC-S111 Standards. If the furnace is installed without filters, the warranty will be voided. MINIMUM FILTER SIZES for DISPOSABLE FILTERS FURNACE INPUT FILTER SIZE 40M / 45M 320 in 2 60M / 70M 483 in 2 80M / 90M 640 in 2 100M / 115M 800 in 2 120M 738 in 2 140M 738 in 2 DISPOSABLE NOMINAL 300 F.M.
PRODUCT DESIGN 3. Integrated ignition control module LED will light. 4. Integrated ignition control monitors safety circuits continuously. Return Air 5. Furnace awaits call from thermostat. Optional Access Door HEATING MODE "A" Min (MODE DIP SWITCH IS SET TO “1 STG” POSITION) COUNTERFLOW TOP RETURN Cabinet Width 14 17 1/2 21 24 1/2 14 17 1/2 21 24 1/2 14 17 1/2 21 24 1/2 Filter Area 2 (in ) Qty. Filter Size (in) 600 2 15x20x1 800 2 20x20x1 1000 2 25x20x1 Dimension "A: (in) 15.1 14.2 13.
PRODUCT DESIGN • • • • • • • • • • • High-stage gas valve closes after five seconds; lowstage gas valve remains open. Integrated control module monitors flame presence. Gas valve will remain open only if flame is detected. Circulator blower is energized on low heat speed following a fixed thirty second blower on delay. Electronic air cleaner terminals are energized with circulator blower. Furnace is now operating in low-stage heating mode.
PRODUCT DESIGN TwinComfort™ Configuration & Operation TwinComfort™ This furnace is capable of the following heating modes: • Single Stage (Factory Setting) • Modified Two-Stage > Fixed 5-Min. Low Stage > Auto Time (1-12 Min.
SYSTEM OPERATION HEATING - Abnormal Operation The following presents the probable causes of questionable furnace operation and how to fix them. Look through the observation window in the blower access door and make a note of the number of flashes in sequence between pauses. Next, refer to the Troubleshooting Chart on the following pages for an interpretation of the LED signals and to the information in this section for a description of the problem. 1.
A/GMH8, GDH8, ADSH8 TROUBLESHOOTING TROUBLESHOOTING CHART Symptoms of Abnormal • Furnace fails to operate. • Integrated control module diagnostic LED Associated NONE Fault Description(s) Fault Possible Causes Possible Causes • No 115 volt power to • Manual disconnect furnace, or no 24 switch OFF, door switch open, or 24 volt wires volt power to integrated control improperly connected or module. loose. • Blown fuse or circuit • Blown fuse or circuit breaker. breaker.
A/GMH8, GDH8, ADSH8 TROUBLESHOOTING TROUBLESHOOTING CHART Symptoms of Abnormal Operation • Circulator blower runs continuously. No furnace operation. Associated LED Code2 Fault Description(s) 4 • Primary limit circuit is open. • Integrated control module diagnostic LED is flashing FOUR (4) flashes. Possible Causes • Insufficient conditioned air over the heat exchanger. Blocked filters, restrictive ductwork, improper circulator blower speed, or failed circulator blower. • Faulty primary limit switch.
POLARIZATION AND PHASING INCOMING POWER METER READS METER READS 120 VOLTS 0 VOLTS As more and more electronic's are introduced to the Heating Trade, Polarization of incoming power and phasing of primary to secondary voltage on transformers becomes more important. VOLT / OHM METER VOLT / OHM METER GND GND Polarization has been apparent in the Appliance industry since the introduction of the three prong plug, however, the Heating Industry does not use a plug for incoming power, but is hard wired.
MAINTENANCE WARNING HIGH VOLTAGE DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH. CAUTION IF YOU MUST HANDLE THE ITNITOR, HANDLE WITH CARE. T OUCHING THE IGNITOR BODY WITH BARE FINGERS, ROUGH HANDLING, OR VIBRATION COULD RESULT IN EARLY IGNITO R FAILURE. O NLY A Q UALIFIED SERVICER SHOULD EVER HANDLE THE IGNITOR.
MAINTENANCE FLAME SENSOR (QUALIFIED SERVICER ONLY) Under some conditions, the fuel or air supply can create a nearly invisible coating on the flame sensor. This coating acts as an insulator, causing a drop in the flame sensing signal. If this occurs, a qualified servicer must carefully clean the flame sensor with steel wool. After cleaning, the flame sensor output should be as listed on the specification sheet. BURNERS WARNING HIGH VOLTAGE ELECTRICAL COMPONENTS ARE CONTAINED IN BOTH COMPARTMENTS.
MAINTENANCE gas and with proper inlet pressures and correct piping size, full capacity will be obtained. With propane gas, no unit gas valve regulator is used; however, the second stage supply line pressure regulator should be adjusted to give 11" water column with all other gas consuming appliances running. The dissipation of the heat transferred to the heat exchanger is now controlled by the amount of air circulated over its surface.
SERVICING 1 1 CUBIC FEET One GAS RATE -- CUBIC FEET PER HOUR Seconds for One Revolution 1/4 cu/ft 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 90 82 75 69 64 60 56 53 50 47 45 43 41 39 37 36 34 33 32 31 30 -28 -26 -- 46 Size of Test Dial 1/2 1 2 cu/ft cu/ft cu/ft 5 cu/ft 180 164 150 138 129 120 113 106 100 95 90 86 82 78 75 72 69 67 64 62 60 -56 -53 -- 1800 1636 1500 1385 1286 1200 1125 1059 1000 947 900 857 818 783 750 720 692 667 643 621 600 581 563 545 529 514
SERVICING Power Failure Blown Fuse Loos e Connection Shorted or Brok en Wires No Low Voltage Faulty Thermostat Faulty Transformer Poor or High Resistance Ground • • • • • • • Faulty Ignition Control Gas Valve or Gas Supply Shut Off Faulty Induced Draft Blower Faulty Blower Motor (PSC) Broken or Shorted Ignitor Dirty Flame Sensor, Low UA Stuck Gas Valve Faulty Gas Valve Open Auxiliary Limit Improper Air Flow or Distribution Cycling on Limit Delayed Ignition • • • • • • • • • • • • • • • • • • • • • Fu
SERVICING SERVICE NUMBERS S-1 CHECKING VOLTAGE ................................................................................................................................. 49 S-2 CHECKING WIRING ................................................................................................................................... 49 S-3A S-3B THERMOSTAT AND WIRING .......................................................................................................................
SERVICING S-1 CHECKING VOLTAGE CHECKING THERMOSTAT, WIRING AND ANTICIPATOR WARNING HIGH VOLTAGE DISCONNECT ALL POWER BEFORE SERVICING OR CHANGING ANY ELECTRICAL WIRING. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH. 1. Remove the burner door to gain entry to the Junction Box. 2. Remove cover from the Junction Box and gain access to incoming power lines.
SERVICING If the anticipator current draw is unknown, then a current amp draw should be measured to determine the anticipator setting. Use an amprobe as shown in the following drawing. 10 TURNS OF THERMOSTAT WIRE (From "W" on thermostat) STATIONARY JAW OF AMPROBE WARNING LINE VOLTAGE NOW PRESENT 3. Use a voltmeter, check voltage across terminals R and C. Must read 24 VAC. 4. No voltage indicates faulty transformer, open fuse, bad wiring, bad splice, or open door interlock switch. 5.
SERVICING 4. Touch one probe of the ohmmeter to the motor frame (ground) and the other probe in turn to each lead. If the windings do not test continuous or a reading is obtained to ground, replace the motor. 5. After completing check and/or replacement of circulator blower motor or induced draft blower motor, reinstall blower compartment door. 6. Turn on electrical power and verify proper unit operation.
SERVICING SUPPLY AIR CUTAWAY OF DUCTWORK TO EXPOSE COIL SUPPLY AIR INCLINED MANOMETER Amana Elec tronic Ai r Cleaner Ca ution High Voltage To a void per sonal in u j ry, wait 15 secon ds afte r de -ene rgizing u nit b efore touch n i g unit n i terior . RETURN AIR Checking Static Pressure (80% Furnace Shown, 90% Similar) S-201 CHECKING TEMPERATURE RISE The more air (CFM) being delivered through a given furnace, the less the rise will be; so the less air (CFM) being delivered, the greater the rise.
SERVICING S-300 CHECKING PRIMARY LIMIT CONTROL All use a nonadjustable, automatic reset, bi-metal type limit control. Refer to the following drawing for the location of the primary limit. Location of Primary Limit Testing Primary Limit Control S-301 CHECKING AUXILIARY LIMIT CONTROL Primary Limit Control Location (80% Upflow Furnace Shown, Counterflow Similar) Style 1 drawing illustrates the Primary Limit used on the 80% furnaces.
SERVICING WARNING HIGH VOLTAGE DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO DO SO MAY CAUSE PROPERTY S-302 CHECKING FLAME ROLLOUT CONTROL A temperature activated manual reset control is mounted to the manifold assembly on 80% furnaces, DAMAGE, PERSONAL INJURY OR DEATH.
SERVICING 7. Turn on electrical power and verify proper unit operation. S-304 CHECKING GAS VALVE (Redundant) VOLT / OHM METER G N D RED RES ET BUT TON A combination redundant operator type gas valve which provides all manual and automatic control functions required for gas fired heating equipment is used. The valve provides control of main burner gas flow, pressure regulation, and 100 percent safety shut-off. WARNING COLOR IDENTIFY ING TAB Checking Flame Rollout Switch a.
SERVICING Orifices should be treated with care in order to prevent damage. They should be removed and installed with a boxend wrench in order to prevent distortion. In no instance should an orifice be peened over and redrilled. This will change the angle or deflection of the vacuum effect or entraining of primary air, which will make it difficult to adjust the flame properly. This same problem can occur if an orifice spud of a different length is substituted.
SERVICING WARNING HIGH VOLTAGE DISCONNECT ALL ELECTRICAL POWER AND SHUT OFF GAS ate gas pressure gauge) at the gas valve outlet pressure tap. Refer to Measuring Gas Pressure: TwoStage Valves figure for two-stage gas valve outlet pressure tap connections. SUPPLY BEFORE SERVICING OR INSTALLING THIS UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO WARNING DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH. LINE VOLTAGE NOW PRESENT 5.
SERVICING Manometer Hose High Fire Regulator Adjust Regulator Vent Common Terminal(C) High Fire Coil Terminal (HI) Manometer Hose Open to Atmosphere Low Fire Coil Terminal (LO) i Inlet Pressure Tap 1/8 NPT Manometer Manometer Measuring Manifold Gas Pressure (36G54 Valve) Outlet Pressure Tap 1/8 NPT Regulator Vent High Fire Regulator Adjust Honeywell Model VR9205 Connected to Manometer 4.
SERVICING Manifold Gas Pressure Gas Natural Gas Rate Range Nominal High Stage 3.2 to 3.8" w.c. 3.5" w.c. Low Stage 1.6 to 2.2" w.c. 1. Improper gas pressure - adjust to proper pressure (See S-307 CHECKING GAS PRESSURE).. 2. Check burner for proper alignment and/or replace burner. 3. Improper orifice size - check orifice for obstruction. 1.9" w.c.
SERVICING S-312 CHECKING FOR DELAYED IGNITION Induced Draft Blower Pressure Switch Pressure Switch Hose 1/4" Tee Inclined Manometer Hose to Induced Draft Blower Tap Delayed ignition is a delay in lighting a combustible mixture of gas and air which has accumulated in the combustion chamber. Furnace design makes this extremely unlikely unless safety controls have been by-passed or tampered with. Never by-pass or alter furnace controls. If delayed ignition should occur, the following should be checked: 1.
SERVICING EAC- H LINE- H K1 K3 XFMR-H K6 K4 COOL-H LINE NEUTRAL PARK PARK LO HEAT- H K5 K2 HI HEAT-H 2. Check for 24 volts from W to C terminal on the ignition control. No voltage. Check transformer, room thermostat, and wiring. If you have 24 volts coming off the transformer but receive approximately 13 volts on the terminal board between (C) and (R), check for blown fuse. 3.
SERVICING WARNING HIGH VOLTAGE DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH. 1. Disconnect the orange flame sensor wire from the sensor . 2. Connect a micro-amp meter in series with this wire and the sensor terminal. 3. Place the unit into a heating cycle. WARNING LINE VOLTAGE NOW PRESENT 4.
