Service Instructions GMSS9*/GCSS9*/AMSS9*/ ACSS9* Single Stage Gas Furnaces and 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 - 6 SERVICING TABLE OF CONTENTS ................ 38 PRODUCT IDENTIFICATION ..........................7-11 TROUBLESHOOTING .................................42- 43 INSTALLATION CONSIDERATIONS ..........12 - 30 SERVICING ..................................................44- 54 SYSTEM OPERATION ...................................... 31 MAINTENANCE ............................................55- 57 ACCESSORIES ...........................
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.
IMPORTANT INFORMATION FOR YOUR SAFETY READ BEFORE OPERATING WARNING: If you do not follow these instructions explosion may result causing property damage, personal injury or loss of life. LIRE AVANT DE METTRE EN MARCHELIRE AVERTISSEMENT: Quiconque ne respecte pas á la lettre les instructions dans le présent manuel risque de déclecher un incendie ou une explosion entraînant des dammages matériels, des lésions corporelles ou la perte de vies humaines. A. This appliance does not have a pilot.
IMPORTANT INFORMATION FOR YOUR SAFETY READ BEFORE OPERATING WARNING: 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 burner. Do not try to light the burner by hand. B.BEFORE OPERATING smell all around the appliance area for gas.
IMPORTANT INFORMATION 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.
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 8 MODEL # MFG # DESCRIPTION GMSS92 GMSS920402BNAA GMSS920603BNAA GMSS920803BNAA GMSS920804CNAA GMSS920805CNAA GMSS921004CNAA GMSS921005CNAA GMSS921205DNAA Goodman® Brand 92% Single Stage Gas Furnace. 34.5" tall, Upflow/Horizontal Installation, 1-stage gas valve induced draft. PSC motor. 120-volt silicon carbide 17-second hot surface ignition. Left or right gas pipe entry. The furnace also features an aluminized steel tubular heat exchanger. Available cabinet widths are 17.
PRODUCT IDENTIFICATION MODEL # MFG # DESCRIPTION AMSS92 AMSS920402BNAA AMSS920603BNAA AMSS920803BNAA AMSS920804CNAA AMSS920805CNAA AMSS921004CNAA AMSS921005CNAA AMSS921205DNAA Amana ® Brand 92% Single Stage Gas Furnace. Upflow/Horizontal Installation, 34.5" tall, 1-stage gas valve induced draft. PSC motor. 120-volt silicon carbide 17second hot surface ignition. Left or right gas pipe entry. The furnace also features a stainless steel tubular heat exchanger. Available cabinet widths are 17.
PRODUCT IDENTIFICATION MODEL # MFG # DESCRIPTION AFE18-60A N/A Fossil Fuel Kit. The AFE18-60A control is designed for use where the indoor coil is located above/downstream of a gas or fossil fuel furnace when used with a heat pump. It will operate with single and two stage heat pumps and single and two stage furnaces. The AFE18-60A control will turn the heat pump unit off when the furnace is turned on. An anti-short cycle feature initiates a 3 minute timed off delay when the compressor goes off.
PRODUCT IDENTIFICATION MODEL # MFG # DESCRIPTION N/A Concentric Vent Kit. This kit is designed to allow terminations of a direct vent furnace to be "concentrically" vented through a wall or roof. This kit allows a single penetration to support terminations for both the vent/flue and the combustion air intake pipe. EFR02 N/A External Filter Rack Kit. For use with 34.5" up flow gas furnaces.
INSTALLATION CONSIDERATIONS 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.
INSTALLATION CONSIDERATIONS 1430 Broadway New York, NY 10018 National Fire Protection Association 1 Batterymarch Park Quincy, MA 02269 • 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.
INSTALLATION CONSIDERATIONS • • • has an adequate supply of combustion air, vent from a nearby uncontaminated room or from outdoors. Refer to the Combustion and Ventilation Air Requirements section in this manual or the installation instructions for details. If the furnace is used in connection with a cooling unit, install the furnace upstream or in parallel with the cooling unit coil. Premature heat exchanger failure will result if the cooling unit coil is placed ahead of the furnace.
INSTALLATION CONSIDERATIONS Corrections must be in accordance with the latest edition of the National Fuel Gas Code NFPA 54/ANSI Z223.1 and/or CSA B149 Installation Codes. If resizing is required on any portion of the venting system, use the appropriate table in Appendix G in the latest edition of the National Fuel Gas Code ANSI Z223.1 and/or CSA B149 Installation Codes.
INSTALLATION CONSIDERATIONS (1) For appliances other than fan-assisted, calculate using the following equation: I other 21 ft3 Required Volume other > ________ _________ ACH 1000 Btu/hr ( ) (2) For fan-assisted appliances, calculate using the following equation: 15 ft3 I fan Required Volume fan > ________ _________ ACH 1000 Btu/hr ) ( where: I other = all appliances other than fan-assisted input in Btu per hour fan = fan-assisted appliances input in Btu per hour ACH = air change per hour (perce
INSTALLATION CONSIDERATIONS (c) The minimum size of outdoor opening(s) shall be the full size of outdoor opening(s) calculated in accordance with 9.3.3, multiplied by the reduction factor. The minimum dimension of air openings shall not be less than 3 in. (80 mm). Chimney or Gas Vent Outlet air duct Furnace NOTE: The air duct openings must have a free area of not less than one square inch per 2000 BTU of the total input rating of all equipment in the enclosure*. 9.3.5 Engineered Installations.
INSTALLATION CONSIDERATIONS 9.3.8.4 Ducts shall not serve both upper and lower combustion air openings where both such openings are used. The separation between ducts servicing upper and lower combustion air openings shall be maintained to the source of combustion air. 9.3.8.5 Ducts shall not be screened where terminating in an attic space. 9.3.8.6 Horizontal upper combustion air ducts shall not slope downward toward the source of combustion air. 9.3.8.
INSTALLATION CONSIDERATIONS Propane Gas and/or High Altitude Installations AIR DISCHARGE WARNING Side Return Duct Connection POSSIBLE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH MAY OCCUR IF THE APPROPRIATE KITS MUST BE APPLIED TO INSURE SAFE AND PROPER FURNACE OPERATION. ALL THE CORRECT CONVERSION KITS ARE NOT INSTALLED. Side Return Duct Connection CONVERSIONS MUST BE PERFORMED BY A QUALIFIED INSTALLER OR SERVICE AGENCY.
INSTALLATION CONSIDERATIONS ensure that all piping and connections possess adequate structural integrity and support to prevent flue pipe separation, shifting, or sagging during furnace operation. Dual Certification: Non-Direct/Direct Vent (90% Furnaces Only) The 90% furnace is dual certified and may be installed as a non-direct vent (single pipe) or direct vent (dual pipe) appliance. A non-direct vent installation requires only a vent/ flue pipe.
INSTALLATION CONSIDERATIONS may be required. Use 1/2” thick closed cell foam insulation such as Armaflex or Insultube where required.
INSTALLATION CONSIDERATIONSAlternate Horizontal Vent Termination (Dual Pipe) 12" MIN. 90° ELBOWS VENT/FLUE TEE (OPTIONAL) or 45° ELBOW TURNED DOWN or 90° ELBOW TURNED DOWN 12" MIN. ABOVE HIGHEST ANTICIPATED SNOW LEVEL 3”-24” BETWEEN PIPES AIR INTAKE SCREEN (OPTIONAL) 12" MIN. ABOVE HIGHEST ANTICIPATED SNOW LEVEL Horizontal Termination (Single Pipe) Above Highest Anticipated Snow Level Combustion Air Intake may also be snorkeled to obtain 12” min ground clearance.
INSTALLATION CONSIDERATIONS exit through the roof of the building. The pipes may be run through an existing unused chimney; however, they must extend a minimum of 12 inches above the top of the chimney. The space between the pipes and the chimney must be closed with a weather tight, corrosion resistant flashing. Both the combustion air intake and a vent/flue pipe terminations must be in the same atmospheric pressure zone.
INSTALLATION CONSIDERATIONS WARNING DO NOT OPERATE THE FURNACE WITH THE RAIN CAP REMOVED AS RECIRUCLATION OF THE FLUE GASES MAY OCCUR. WATER MAY ALSO COLLECT INSIDE THE LARGER COMBUSTIN AIR PIPE AND FLOW TO THE BURNER ENCLOSURE. FAILURE TO FOLLOW THIS WARNING CAN RESULT IN PROPERTY DAMAGE, EQUIPMENT DAMAGE, PERSONAL INJURY OR DEATH. Concentric Sidewall Vent Kit (0170K00000S) This (sidewall only) vent kit is to be used with 2” - 3” vent systems.
INSTALLATION CONSIDERATIONS the gas is artificially derated, the appropriate orifice size must be determined based upon the BTU/ft3 content of the derated gas and the altitude. Refer to the National Fuel Gas Code, NFPA 54/ANSI Z223.1, and information provided by the gas supplier to determine the proper orifice size. A different pressure switch may be required at high altitude regardless of the BTU/ft3 content of the fuel used.
INSTALLATION CONSIDERATIONS and length of the run. The gas line installation must comply with local codes, or in their absence, with the latest edition of the National Fuel Gas Code, NFPA 54/ANSI Z223.1. WARNING TO AVOID THE POSSIBLITY OF EXPLOSION OR FIRE, NEVER USE A Natural Gas Capacity of Pipe MATCH OR OPEN FLAME TO TEST FOR LEAKS.
INSTALLATION CONSIDERATIONS Sizing Betw een First and Second Stage Regulator* 5 to 15 PSIG (20 PSIG Max.) First Stage Regulator 200 PSIG Maximum Continuous 11" W.C. Second Stage Regulator Typical Propane Gas Installation WARNING IF THE GAS FURNACE IS INSTALLED IN A BASEMENT, AN EXCAVATED AREA OR A CONFINED SPACE, IT IS STRONGLY RECOMMENDED TO CONTACT A PROPANE SUPPLIER TO INSTALL A GAS DETECTING WARNING DEVICE IN CASE OF A GAS LEAK.
INSTALLATION CONSIDERATIONS 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 Connect hot, neutral, and ground wires as shown in the wiring diagram located on the unit’s blower door. Line polarity must be observed when making field connections. Line voltage connections can be made through either the right or left side pan. DAMAGE, PERSONAL INJURY OR DEATH.
INSTALLATION CONSIDERATIONS trates the typical field wiring for a heat only single stage system and a single stage heating/single stage cooling system. Refer to the following figures for proper connections to the integrated control module. CIRCULATING AIR AND FILTERS DUCTWORK - AIR FLOW Duct systems and register sizes must be properly designed for the C.F.M. and external static pressure rating of the furnace.
INSTALLATION CONSIDERATIONS installed in any position, except with the access door facing down. The best location for the air cleaner is in the return air duct next to the blower compartment. Before installing the air cleaner, consider the application.
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.
ACCESSORIES EXTERNAL FILTER RACK ( EFR02 ) EFR02 EXTERNAL FILTER RACK KIT SLOTS IN FILTER CLEAR SCREWS ON UNIT Used on Models 90% Upflow Model Furnaces UNIT SIDE PANEL FRONT OF UNIT LOWER EDGE SCREW SIDE WALL VENT KIT (0170K00000S/0170K00001S) SIDE WALL VENT KIT (0170K00000S) This side wall only vent kit #0170K00000S is to be used with 2” - 3” vent systems. This kit is NOT intended for use with single pipe (indirect vent) installations.
ACCESSORIES CONCENTRIC VENT CONVERSION KIT (CVENT-2 (DCVK-20) CVENT-3 (DCVK-30) Vent The CVENT-2 (DCVK-20) (2") or the CVENT-3 (DCVK-30) (3") is a concentric vent kit approved with furnaces listed in this manual. This concentric vent kit allows for vertical or horizontal vent termination. The illustrations give a brief view of the kit and its application.
ACCESSORIES ● ● ● (1) ● ● ● *MSS9*0803BNAA ● ● ● ● ● ● ● (1) ● ● ● *MSS9*0804CNAA ● ● ● ● ● ● ● (1) ● ● ● *MSS9*0805CNAA ● ● ● ● ● ● ● (1) ● ● ● *MSS921004CNAA ● ● ● ● ● ● ● (1) ● ● ● *MSS9*1005CNAA ● ● ● ● ● ● ● (1) ● ● ● *MSS9*1205DNAA ● ● ● ● (1) ● ● ● *CSS9*0402BNAA ● ● ● ● ● ● (1) ● ● ● ● *CSS9*0603BNAA ● ● ● ● ● ● (1) ● ● ● ● *CSS9*0804CNAA ● ● ● ● ● ● (1) ● ● ● ● *CSS9*1005CNAA ● ● ● ●
ACCESSORY WIRE 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 WIRE 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. 0.1 ON SETTI ( ( STAT AN - ) 1 2 L) Y1 L)Y2 N ( U )R (C N) C H H C C (1 (2ND (1 (2ND L HER O AT CONN C ON TW I O ) SI FA T' C R r Wire as above for GMH, AMH, GDH AND GCH hybrid furnaces. ace 1 Furnace 2 Black - High Blue - Med./High Orange - Med.
ACCESSORY WIRE 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. For installations made after 2/1/11 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.
SERVICING SERVICE NUMBERS S-1 CHECKING VOLTAGE ........................................................................................................................... 44 S-2 CHECKING WIRING .............................................................................................................................. 44 S-3A THERMOSTAT AND WIRING ................................................................................................................. 44 S-3B HEATING ANTICIPATOR ............
SERVICING 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. INCOMING POWER METER READS METER READS 120 VOLTS 0 VOLTS 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.
SERVICING 1 1 CUBIC FEET One GAS RATE -- CUBIC FEET PER HOUR 40 5 cu/ft Seconds for One Revolutio n 1/4 cu/ft 1/2 cu/ft 1 cu/ft 2 cu/ft 5 cu/ft 720 1800 36 25 50 100 200 500 327 655 1636 37 -- -- 97 195 486 300 600 1500 38 23 47 95 189 474 138 277 555 1385 39 -- -- 92 185 462 129 257 514 1286 40 22 45 90 180 450 60 120 240 480 1200 41 -- -- -- 176 439 16 56 113 225 450 1125 42 21 43 86 172 429 17 53 106 212 424 1059 43
SERVICING Power Failure Blown Fuse Loose Connection Shorted or Broken W ires No Low Voltage Faulty Thermostat Faulty Transformer Poor or High Resistance Ground • Faulty Flame Sensor 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 • • • • • • • • • • • • • • • • • • • Orifice Size Cracked
TROUBLESHOOTING Symptoms of Abnormal Operation • Furnace fails to operate. • Integrated control module diagnostic LED provides no signal. Associated LED Code2 NONE Fault Description(s) Fault Description(s) Possible Causes Possible Causes • No 115 volt power to • Manual disconnect furnace, or no 24 switch OFF, door switch volt power to open, or 24 volt wires integrated control improperly connected or module. loose. • Blown fuse or circuit • Blown fuse or circuit breaker. breaker.
TROUBLESHOOTING Symptoms of Abnormal Associated Operation LED Code2 • Circulator blower runs continuously. No furnace operation. • Integrated control module diagnostic LED is flashing FOUR (4) flashes. Fault Description(s) Possible Causes Corrective Action • Primary or auxiliary limit circuit is open. • Faulty primary or auxiliary limit switch. • Insufficient conditioned air over the heat exchanger. Blocked filters, restrictive ductwork, improper circulator blower speed, or failed circulator blower.
SERVICING S-1 CHECKING VOLTAGE AND ANTICIPATOR S-3A THERMOSTAT AND WIRING 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 on furnaces to gain entry to the Junction Box. 2. Remove cover from the Junction Box and gain access to incoming power lines. With Power ON: WARNING DISCONNECT ALL POWER BEFORE SERVICING. 1.
SERVICING The cooling anticipator is a small heater (resistor) in the thermostat. During the "OFF" cycle it heats the bimetal element helping the thermostat call for the next cooling cycle. This prevents the room temperature from rising too high before the system is restarted. A properly sized anticipator should maintain room temperature within 1 1/2 to 2 degrees. The anticipator is fixed in the subbase and is not to be replaced. If the anticipator should fail for any reason, the subbase must be changed.
SERVICING S-16A CHECKING AIR CIRCULATOR BLOWER MOTOR (PSC) work. SUPPLY AIR WARNING CUTAWAY OF DUCTWORK TO EXPOSE COIL DISCONNECT ALL POWER BEFORE SERVICING. 1. Remove blower compartment door to gain access to the circulator blower motor and integrated ignition control. 2. Discharge the capacitor on (PSC) motors. Disconnect the motor wire leads from its connection point at the integrated ignition control module and capacitor if applicable. 3.
SERVICING ENCLOSED DISK SUPPLY AIR FRONT VIEW RETURN AIR SIDE VIEW Primary Limit Control Style (90% Furnaces) WARNING Checking Temperature Rise 3. Subtract the return air temperature from the supply air temperature to determine the air temperature rise. Allow adequate time for thermometer readings to stabilize. 4. Adjust temperature rise by adjusting the circulator blower speed. Increase blower speed to reduce temperature rise. Decrease blower speed to increase temperature rise.
SERVICING S-302 CHECKING FLAME ROLLOUT CONTROL A temperature activated manual reset control is mounted to the manifold assembly on 90% furnaces, as shown in the following illustrations. Should read continuous unless heat exchanger temperature is above limit control setting. If not as above, replace the control. VOLT / OHM METER FLAME ROLLOUT SWITCHES COLOR IDENTIFYING TAB * Testing Primary Limit Control (90% Furnaces) 4.
SERVICING S-304 CHECKING GAS VALVE (REDUNDANT) 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. VOLT / OHM METER D N G RED RESET BUTTON WARNING DISCONNECT ALL POWER BEFORE SERVICING COLOR IDENTIFYING TAB Checking Flame Rollout Switch a.
SERVICING age. They should be removed and installed with a box-end 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. WARNING DISCONNECT ALL GAS AND ELECTRICAL POWER SUPPLY. 1. Check orifice visually for distortion and/or burrs. 2. Check orifice size with orifice sizing drills. 3.
SERVICING WARNING HIGH VOLTAGE DISCONNECT ALL ELECTRICAL POWER AND SHUT OFF GAS SUPPLY BEFORE SERVICING OR INSTALLING THIS UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH. 5. Disconnect manometer after turning off gas at manual shutoff valve. Reinstall plug before turning on gas to furnace. 6. Turn OFF any unnecessary gas appliances started in step 3. 7. Turn on gas to furnace and check for leaks.
SERVICING f. Remove regulator cover screw from the outlet pressure regulator adjust tower and turn screw clockwise to increase pressure or counterclockwise to decrease pressure. Replace regulator cover screw. i. Turn off all electrical power and gas supply to the system. j. Remove the manometer hose from the hose barb fitting or outlet pressure boss. k. Remove the 1/8" NPT hose barb fitting from the outlet pressure tap. Replace the outlet pressure boss plug and seal with a high quality thread sealer.
SERVICING S-313 CHECKING INTEGRATED IGNITION CONTROL BOARDS WARNING HIGH VOLTAGE DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS UNIT. M ULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO DO SO MAY CAUSE PROPERTY NOTE: Failure to earth ground the furnace, reversing the neutral and hot wire connection to the line (polarity), or a high resistance connection in the neutral line may cause the control to lockout due to failure to sense flame. DAMAGE, PERSONAL INJURY OR DEATH. 1.
SERVICING 3. Check for 120 volts to the induced draft blower by measuring voltage between Pin 1 (on the 2-pin connector) and Line (Neutral) on the control board. No voltage, replace ignition control. 4. If voltage is present in Steps 1 through 3 and the induced draft blower is operating, check for 120 volts to the ignitor during the preheat cycle. Measure voltage between Pin 2 (on the 2-pin connector) and Line (Neutral) on the control board. No voltage, check pressure switch. 5.
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 IG NITOR BODY WITH BARE FINGERS, ROUG H HANDLING, OR VIBRATIO N COULD RESULT IN EARLY IGNITO R FAILURE. O NLY A Q UALIFIED SERVICER SHOULD EVER HANDLE THE IGNITO R.
MAINTENANCE CONDENSATE DRAINAGE SYSTEM (QUALIFIED SERVICER ONLY) The drain tubes, standpipe, and field supplied drain line must be checked annually and cleaned as often as necessary to ensure proper condensate drainage. 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.
MAINTENANCE EXAMPLE: INPUT: 92,000 BTU/HR OUTPUT CAP: 84,000 Should the figure you calculated not fall within five (5) percent of the nameplate rating of the unit, adjust the gas valve pressure regulator or resize orifices. CAUTION ALWAYS CONNECT A MONOMETER TO THE OUTLET TAP AT THE GAS VALVE BEFORE ADJUSTING THE PRESSURE REGULATOR. IN NO CASE SHOULD THE FINAL MANIFOLD PRESSURE VARY MORE THAN PLUS OR MINUS .3 INCHES WATER COLUMN FROM 3.
