Table of Contents
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Service and Troubleshooting
Goodman
®
Pride and workmanship go into every product to provide
our customers with quality products. It is possible, however,
that during its lifetime a product may require service.
Products should be serviced only by a qualified service
technician who is familiar with the safety procedures
required in the repair and who is equipped with the proper
tools, parts, testing instruments and the appropriate service
manual. REVIEW ALL SERVICE INFORMATION IN THE
APPROPRIATE SERVICE MANUAL BEFORE
BEGINNING REPAIRS.
Only personnel that have been trained to install, adjust,
service or repair(hereinafter, "service") the equipment
specified in this manual should service the equipment. The
manufacturer will not be responsible for any injury or
property damage arising from improper service or service
procedures. If you service this unit, you assume responsi-
bility for any injury or property damage which may re-
sult. In addition, in jurisdictions that require one or more
licenses to service the equipment specified in this manual,
only licensed personnel should servise the equipment.
Improper installation, adjustment, servicing or repair of
the equipment specified in this manual, or attempting to
install, adjust, service or repair the equipment specified in
this manual without proper training may result in product
damage, property damage, personal injury or death.
Brand GM9C96/GC9C96 & Amana
Two Stage Furnace with Nine speed ECM Motor
WARNING
Copyright © 2021
is a registered trademark of Maytag Corporation or its related companies and is used under license.
®
IMPORTANT INFORMATION ............................................ 2
PRODUCT IDENTIFICATION ........................................... 4
SYSTEM OPERATION ...................................................... 5
SCHEDULED MAINTENANCE ....................................... 18
SERVICING ..................................................................... 22
CHECKING VOLTAGE .............................................. 23
CHECKING WIRING .................................................. 23
CHECKNG THERMOSTAT, WIRING ........................ 23
CIRCUIT ...................................................................... 23
CHECKING DUCT STATIC ........................................ 24
CHECKING TEMPERATURE RISE .......................... 25
CHECKING PRIMARY LIMIT CONTROL ................. 25
CHECKING AUXILIARY LIMIT CONTROL ............... 26
CHECKING FLAME ROLLOUT CONTROL ............. 27
INDUCED DRAFT BLOWER MOTOR ...................... 27
CECKING GAS VALVE (REDUNDANT) ................... 27
CHECKING MAIN BURNERS ................................... 28
CHECKING ORIFICES .............................................. 28
CHECKING GAS PRESSURE .................................. 28
CHECKING HOT SURFACE IGNITOR ..................... 30
CHECKING FOR FLASHBACK ................................. 30
CHECKING PRESSURE SWITCH............................ 30
HIGH ALTITUDE APPLICATION ............................... 31
CHECKING FOR DELAYED IGNITION .................... 31
BOARDS ..................................................................... 31
CHECKING FLAME SENSOR ................................... 32
TROUBLESHOOTING CHART ....................................... 33
WIRING DIAGRAMS ....................................................... 37
Goodman Manufacturing Company, L.P.
All rights reserved.
Brand AM9C96/AC9C96
®
TABLE OF CONTENTS
RS6612020
June 2021
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Related Manuals for Maytag Goodman GM9C96
Summary of Contents for Maytag Goodman GM9C96
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Page 1: Table Of Contents
CHECKING FLAME SENSOR ........32 TROUBLESHOOTING CHART ........33 WIRING DIAGRAMS ............37 RS6612020 June 2021 Copyright © 2021 Goodman Manufacturing Company, L.P. is a registered trademark of Maytag Corporation or its related companies and is used under license. ® All rights reserved. -
Page 2: Important Information
IMPORTANT INFORMATION IMPORTANT NOTICES FOR CONSUMERS AND SERVICERS RECOGNIZE SAFETY SYMBOLS, WORDS AND LABELS Pride and workmanship go into every product to provide our customers with quality products. It is possible, however, that during its lifetime a product may require service. Products should be serviced only by a qualified service technician who is familiar with the safety procedures required in the repair and who is equipped with the proper tools, parts, testing in-... - Page 3 IMPORTANT INFORMATION CO can cause serious illness including permanent brain damage or death. B10259-216 Advertencia especial para la instalación de calentadores ó manejadoras de aire en áreas cerradas como estacionamientos ó cuartos de servicio. Las emisiones de monóxido de carbono pueden circular a través del aparato cuando se opera en cualquier modo.
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Page 4: Product Identification
NOMENCLATURE 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. Brand Minor Revision G - Goodman A - Initial Release V - GMC B - 1st Revision Configuration M - Upflow/Horizontal... -
Page 5: System Operation
SYSTEM OPERATION Introduction Return any old or new controls to their containers before touching any ungrounded object. This is a Category lV furnace. This furnace uses a pressurized venting system and must be installed per National and local Product Application codes requirements and the installation manual that was This product is designed for use as a residential home gas shipped with the furnace. - Page 6 SYSTEM OPERATION of the house (clothes dryers, exhaust fans, fireplaces, etc.) *M9C96 M INIMUM CLEARANCES TO COMBUSTIBLE M ATERIALS increase the problem by starving appliances for air. When the furnace is installed as a direct ven (2-pipe) furnace, POSITION*S IDES REAR FRONTB OTTOMF...
- Page 7 SYSTEM OPERATION DISCHARGE Side Side Return Return Duct Duct Connection Connection Bottom Return Duct Connection Figure 10 UPFLOW Counterflow UPRIGHT 1. Remove screws from the vent flange. 2. Remove the internal elbow and vent pipe Bottom 3. Cut 2 1/2” from the flange . Return Duct 4.
- Page 8 SYSTEM OPERATION Propane Gas and/or High Altitude Installations WARNING WARNING N UPRIGHT UPFLOW INSTALLATIONS, THE DRAIN TRAP MUST BE MOUNTED ON OSSIBLE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH MAY OCCUR IF THE OPPOSITE SIDE OF THE UNIT FROM THE JUNCTION BOX. HIS WILL THE CORRECT CONVERSION KITS ARE NOT INSTALLED.
- Page 9 SYSTEM OPERATION amount of air into the burner. This may cause incomplete The gas piping supplying the furnace must be properly sized combustion, flashback, and possible yellow tipping. based on the gas flow required, specific gravity of the gas, and length of the run. The gas line installation must comply In some areas the gas supplier may artificially derate the gas with local codes, or in their absence, with the latest edition of in an effort to compensate for the effects of altitude.
- Page 10 SYSTEM OPERATION GAS PIPING CHECKS Before placing unit in operation, leak test the unit and gas 5 to 15 PSIG First Stage (20 PSIG Max.) Regulator connections. Continuous 11" W.C. WARNING 200 PSIG Second Stage O AVOID THE POSSIBLITY OF EXPLOSION OR FIRE, NEVER USE A MATCH Maximum Regulator OR OPEN FLAME TO TEST FOR LEAKS.
- Page 11 SYSTEM OPERATION When installing a propane storage tank, the contractor WARNING must consider proper tank sizing, safety, efficiency, ground characteristics and aesthetics. For a residential customer, F THE INFORMATION IN THESE INSTRUCTIONS IS NOT FOLLOWED EXACTLY, A the size may range from 100-1,000 gallons, depending on FIRE OR EXPLOSION MAY RESULT CAUSING PROPERTY DAMAGE, PERSONAL household use.
- Page 12 SYSTEM OPERATION are built into the furnace to allow use with most cooling equipment. Consult the wiring diagram located in this manual, the installation manual, or on the blower door for further details of 115 Volt and 24 Volt wiring. N 90% FURNACE UPRIGHT UPFLOW INSTALLATIONS, THE DRAIN TRAP MUST BE MOUNTED ON THE OPPOSITE SIDE OF THE UNIT FROM THE JUNCTION BOX.
- Page 13 SYSTEM OPERATION • Fixed time options are expressed in minutes on the Twinning allows simultaneous operation of two furnaces and display as: 10 20 30 60. forces the indoor blower motors of each furnace to operate synchronously into a common duct system. Using the twinning •...
- Page 14 SYSTEM OPERATION inside the furnace junction box. The integrated control module humidifier terminal (HUM H) is energized with 115 volts whenever the induced draft blower is energized. The integrated control module electronic air cleaner terminal (EAC H) is energized with 115 volts whenever the circulator blower is energized.
- Page 15 SYSTEM OPERATION • The 2nd stage gas heat speed of the indoor blower is 2. The control will rotate available speed number every time energized left/right switches are pressed. All 9 speeds are available for circulation. • When the thermostat is satisfied: 3.
- Page 16 SYSTEM OPERATION Cooling Mode Speed Selection must supply a means of filtering all of the return air. Filter(s) shall comply with UL900 or CAN/ULC-S111 Standards. If To change the main blower speed in COOLING mode, follow the furnace is installed without filters, and is not covered by the following steps: the warranty.
- Page 17 SYSTEM OPERATION make sure furnace condensate trap is clean. Make sure Upflow Models Minimum Recommended Filter Size furnace is not improperly sloped. Make sure air conditioning *0403A* 1 - 16 X 25 Side or 1 - 14 X 24 Bottom Return coil drain is not interfering with furnace drain.
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Page 18: Scheduled Maintenance
SCHEDULED MAINTENANCE Maintenance WARNING Improper filter maintenance is the most common cause of inadequate heating or cooling performance. Filters should HIGH VOLTAGE be cleaned (permanent) or replaced (disposable) every two ISCONNECT POWER BEFORE SERVICING OR months or as required. It is the owner’s responsibility to keep INSTALLING THIS UNIT. - Page 19 SCHEDULED MAINTENANCE Periodically during the heating season make a visual check of the burner flames. Turn the furnace on at the thermostat. Wait a few minutes since any dislodged dust will alter the normal flame appearance. Flames should be stable, quiet, soft and blue with slightly orange tips.
- Page 20 SCHEDULED MAINTENANCE In this example we are using the one cubic foot dial on the gas meter CUBIC FEET TABLE 1 4. Using Table 2 below, find the number of seconds it took for the dial to make a full revolution. To the right of that num- ber of seconds and below the Size of Test Dial (selected in step 3 and shown in Table 1) will be the Cubic Feet per Hour (CFH).
- Page 21 SCHEDULED MAINTENANCE 6. Check with your local utility for actual BTU content (caloric value) of natural gas in the area (the average is 1025 BTU’s). 7. Use this formula to calculate the BTU/HR input (See BTU/HR Calculation Example): Cubic Feet per Hour (CFH) x BTU content of your natural gas = BTU/HR input 8.
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Page 22: Servicing
SERVICING As more and more electronic's are introduced to the Heat- INCOMING POWER ing Trade, Polarization of incoming power and phasing of 120.00 0.00 primary to secondary voltage on transformers becomes more important. 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. -
Page 23: Checking Voltage
SERVICING CHECKING VOLTAGE CHECKING THERMOSTAT, WIRING WARNING WARNING HIGH VOLTAGE ISCONNECT POWER BEFORE SERVICING. ISCONNECT POWER BEFORE SERVICING OR 1. Remove the blower compartment door to gain access to CHANGING ANY ELECTRICAL WIRING. ULTIPLE POWER the thermostat low voltage wires located at the furnace SOURCES MAY BE PRESENT. -
Page 24: Checking Air Circulator Blower Motor
SERVICING 2. Remove the thermostat low voltage wires at the furnace one of the speed taps is referenced between the COM integrated control module terminals. terminal in the speed tap harness and the speed taps on the control board. These voltages will range from 3-15 With Power On (and Door Interlock Switch closed): vDC depending upon speed selection. -
Page 25: Checking Temperature Rise
SERVICING speed. Increase blower speed to reduce temperature rise. CHECKING TEMPERATURE RISE Decrease blower speed to increase temperature rise. Refer to Circulator Blower Speed section in the Product The more air (CFM) being delivered through a given furnace, Design section of this manual for speed changing details. the less the rise will be;... -
Page 26: Checking Auxiliary Limit Control
SERVICING 3. With an ohmmeter, test between these two terminals WARNING as shown in the following drawing. The ohmmeter should read continuous unless heat exchanger tem- HIGH VOLTAGE perature is above limit control setting. If not as above, ISCONNECT POWER BEFORE SERVICING OR replace the control. -
Page 27: Checking Flame Rollout Control
SERVICING CHECKING FLAME ROLLOUT CONTROL INDUCED DRAFT BLOWER MOTOR A temperature activated manual reset control is mounted to WARNING the manifold assembly as shown in the following illustration. HIGH VOLTAGE ISCONNECT POWER BEFORE SERVICING OR ULTIPLE POWER SOURCES MAY INSTALLING THIS UNIT. BE PRESENT. -
Page 28: Checking Main Burners
SERVICING Check orifice visually for distortion and/or burrs. CHECKING MAIN BURNERS Check orifice size with orifice sizing drills. The main burners are used to provide complete combustion of various fuels in a limited space, and transfer this heat of the burning process to the heat exchanger. Proper ignition, combustion, and extinction are primarily due to burner design, orifice sizing, gas pressure, primary and secondary air, vent and proper seating of burners. - Page 29 SERVICING High Fire Regulator Adjust Regulator Vent . Common Terminal(C) White-Rodgers Model 36J54 Connected to Manometer White-Rodgers Model 36J54 Connected to Manometer Measuring Inlet Gas Pressure (Alt. Method) 1. Turn OFF gas to furnace at the manual gas shutoff valve external to the furnace. CAUTION 2.
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Page 30: Checking Hot Surface Ignitor
SERVICING CHECKING HOT SURFACE IGNITOR 12. Remove the manometer hose from the hose barb fitting or outlet pressure tap. 120V Silicon Nitride Ignitor - *M/C9C96 use a 120V silicon nitride igniter for ignition. The normal operating temperature 13. Replace outlet pressure tap: is approximately 2156°F - 2678°F. -
Page 31: High Altitude Application
SERVICING and the ohm meter should show a complete circuit across 2. Improper burner positioning - burners should be in locating the pressure switch. If the switch is not closed, compare slots, level front to rear and left to right. the negative pressure to the closing point specified for 3. -
Page 32: Checking Flame Sensor
SERVICING CHECKING FLAME SENSOR A flame sensing device is used in conjunction with the ignition control module to prove combustion. If proof of flame is not present the control will de-energize the gas valve and “retry” for ignition or lockout. WARNING HIGH VOLTAGE ISCONNECT... - Page 33 IMPORTANT INFORMATION 2 Stage Status Codes LED Display Menu Description Notes Main Menu Option Menu ( xx: code numbers ) xx Active Alarm menu xx ( xx: code numbers ) Last 6 Faults ...
- Page 34 IMPORTANT INFORMATION 2 Stage Status Codes Main Mode Menu Idle Continous Fan Compressor Cooling, Low Stage Compressor Cooling, High Stage Gas heat, Low Stage ...
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Page 35: Troubleshooting Chart
IMPORTANT INFORMATION 2 Stage Troubleshooting Codes TROUBLESHOOTING CHART Symptom LED Status Fault Description Corrective Actions Normal operation Normal operation None Locate and correct gas interruption Replace or realign igniter Furnace lockout due to an excessive number Check flame sense signal, clean sensor if coated or of ignition “retries”... - Page 36 IMPORTANT INFORMATION 2 Stage Troubleshooting Codes TROUBLESHOOTING CHART Symptom LED Status Fault Description Corrective Actions Flame sense micro amp signal is minimal Clean flame sensor if coated or oxidized Inspect for Flame sensor is coated/oxidized proper flame sensor alignment Normal furnace operation Flame sensor incorrectly positioned in burner ...
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Page 37: Wiring Diagrams
WIRING DIAGRAMS *M9C96/*C9C96 POWER BEFORE PROPERLY POLARIZED 40 VA TRANSFORMER TH (3) HLO (1) PS1(5) READ CODES FROM LEFT TO RIGHT HLI (8) MVL (10) MVH (4) INTEGRATED CONTROL MODULE MVC (11) TR (7) W/W1 R Y/Y1 ECM MTR INDOOR HARNESS CIRCULATOR MICRO... - Page 38 GOODMAN BRAND ® AMANA BRAND ® is a registered trademark of Maytag Corporation or its related companies and is used under license. ® All rights reserved. Copyright © 2021 Goodman Manufacturing Company, L.P.