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Service Instructions
Goodman
& Amana
PROP 65 WARNING
FOR CALIFORNIA CONSUMERS
WARN ING
www.P65Warnings.ca.gov
This manual is to be used by qualified, professionally trained HVAC technicians only. Goodman does not as-
sume 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 manufacturers installation
and operation instructions.
and is under license to Goodman Company, L.P., Houston, TX, USA. All rights reserved.
Brand GMEC80/GCEC80
®
Brand AMEC80/ACEC80
®
Two Stage Furnace
with multi-speed ECM Motor
-
0140M00517-A
is a registered trademark of Maytag Corporation or its related companies
®
Copyright© 2019 Goodman Company, L.P.
®
WARNING
Only personnel that have been trained to install, adjust, ser-
vice or repair(hereinafter, "service") the equipment specified
in this manual should service the equipment. The manufac-
turer will not be responsible for any injury or property dam-
age arising from improper service or servide procedures.
If you service this unit, you assume responsibility for any
injury or property damage which may result. 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 dam-
age, property damage, personal injury or death.
RS6621005
October 2019
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Table of Contents
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Summary of Contents for Goodman GMEC80
- Page 1 0140M00517-A This manual is to be used by qualified, professionally trained HVAC technicians only. Goodman does not as- sume 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 manufacturers installation and operation instructions.
-
Page 2: Table Of Contents
TABLE OF CONTENTS IMPORTANT INFORMATION .......2 SERVICING ............17 PRODUCT IDENTIFICATION ......6 TROUBLESHOOTING ........20 ACCESSORIES............7 SERVICING ............23 SYSTEM OPERATION.........9 MAINTENANCE ..........35 ACCESSORY WIRING DIAGRAMS ....16 WIRING DIAGRAMS ..........36 IMPORTANT INFORMATION 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. - Page 3 IMPORTANT INFORMATION FOR YOUR SAFETY READ BEFORE OPERATING WARNING: Improper If you do not follow these instructions exactly, alteration, service or a fire or explosion may result causing property maintenance can damage, personal injury or loss of life. cause injury or property damage.
- Page 4 CONSIGNES DE SECURITE - LIRE INSTRUCTIONS DE SERVICE AVANT D'ALLUMER L'APPAREIL 1. UN INSTANT! Lisez d'abord les consignes de securite ci-dessus. 2. Reglez le thermostat a son point le plus bas. AVERTISSEMENT: Le non-respect des instructions qui suivent peut 3. Coupez l'alimentation electrique de l'appareil. entrainer un risque d'incendie ou d'explosion causant des dommages, 4.
- Page 5 To locate an authorized servicer, please consult your telephone book or the dealer from whom you purchased this product. For further assistance, please contact: CONSUMER INFORMATION LINE CONSUMER INFORMATION LINE AMANA BRAND PRODUCTS GOODMAN BRAND PRODUCTS ® ® TOLL FREE TOLL FREE 1-877-254-4729 (U.S.
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Page 6: Product Identification
Please use these numbers when requesting service or parts information. Furnace Nomenclature (14 Digits) Brand Minor Revision A- Amana A - Initial Release G - Goodman B - 1st Revision Configuration M - Upflow/Horizontal Major Revision C - Downflow/Horizontal A - Initial Release... -
Page 7: Accessories
ACCESSORIES ACCESSORY DESCRIPTION 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 AFE18-60A pumps and single and two stage furnaces. - Page 8 L.P. ® ® External Filter Rack Kit. For use with Goodman and Amana Brand 80% upflow gas furnaces. This kit is intended to provide a location, external to the furnace casing for installation of a permanent filter. The rack is...
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Page 9: System Operation
SYSTEM OPERATION 70 and/or The Canadian Electric Code CSA C22.1. WARNING An electrical disconnect must be provided at the furnace location. F THE INFORMATION IN THESE INSTRUCTIONS IS NOT FOLLOWED EXACTLY, A FIRE OR EXPLOSION MAY RESULT CAUSING PROPERTY DAMAGE, PERSONAL NOTE: Line polarity must be observed when making field INJURY OR LOSS OF LIFE. - Page 10 SYSTEM OPERATION The integrated control module electronic air cleaner ter- Single-Stage Heating Thermostat Application minals (EAC) are energized with 115 volts whenever the A single-stage thermostat with only one heating stage circulator blower is energized. may be used to control this furnace. The application of a single-stage thermostat offers a timed transition from low 24 VOLT THERMOSTAT WIRING to high fire.
- Page 11 SYSTEM OPERATION CIRCULATOR BLOWER SPEED ADJUSTMENT CIRCULATING AIR AND FILTERS DUCTWORK - AIR FLOW WARNING Duct systems and register sizes must be properly designed for the C.F.M. and external static pressure rating of the HIGH VOLTAGE furnace. Ductwork should be designed in accordance with ISCONNECT POWER BEFOR CHANGING SPEED TAPS.
- Page 12 SYSTEM OPERATION installer must supply a means of filtering all of the return WARNING air. Filter(s) shall comply with UL900 or CAN/ULC-S111 Standards. If the furnace is installed without filters, and is O AVOID PERSONAL INJURY OR DEATH DUE TO ELECTRICAL SHOCK not covered by the warranty.
- Page 13 SYSTEM OPERATION DIP Switch Settings PCBBF139 CONTROL BOARD DIP SWITCHES Cooling Switches Heating Dip Switch Switch Purpose Function Group Switches 2 Stage Stat Thermostat 1 Stg Stat 10 min delay Setup 1 Stg Stat 20 min delay Auto OFF* Continuous Heating Fan Fan CFM Off Delay...
- Page 14 SYSTEM OPERATION • The air cleaner will be energized with the circulator. WARNING • If the call for heat is lost while the control is in the trial for ignition period without flame being detected, O AVOID PERSONAL INJURY OR DEATH DUE TO ELECTRICAL SHOCK the control will turn off the gas valve and igniter.
- Page 15 SYSTEM OPERATION • Following the 60 second Cool Mode Fan Off Delay • If the average calculated duty cycle is 50% or greater, then the heating cycle will be treated as if high stage period, the cool circulator and air cleaner relay are is needed and the transition from low to high stage de-energized.
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Page 16: Accessory Wiring Diagrams
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. ALL FUEL SYSTEM CONTROL BOARD - AFE1860A 24VAC +VDC POWER SUPPLY P1-8... -
Page 17: Servicing
SERVICING As more and more electronic's are introduced to the Heat- INCOMING POWER ing Trade, Polarization of incoming power and phasing of METER READS METER READS primary to secondary voltage on transformers becomes 120 VOLTS 0 VOLTS more important. Polarization has been apparent in the Appliance industry VOLT / OHM VOLT / OHM since the introduction of the three prong plug, however,... - Page 18 SERVICING CUBIC FEET GAS RATE -- CUBIC FEET PER HOUR Size of Test Dial Size of Test Dial Seconds Seconds for One for One Revolution Revolution cu/ft cu/ft cu/ft cu/ft cu/ft cu/ft cu/ft cu/ft cu/ft cu/ft 1800 1636 1500 1385 1286 1200 1125...
- Page 19 SERVICING HEATING PERFORMANCE TEST Before attempting to diagnose an operating fault, run a heating performance test and apply the results to the Service Problem Analysis Guide. To conduct a heating performance test, the BTU input to the furnace must be calculated. After the heating cycle has been in operation for at least fifteen minutes and with all other gas appliances turned off, the gas meter should be clocked.
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Page 20: Troubleshooting
TROUBLESHOOTING Green Amber Symptoms Fault Description Check Cautions LED Code LED Code LED Code •Defective disconnect switch •Determine cause and restore •Confirm electrically safe •Furnace fails to operate •defective door switch • No •None •None •None proper high and low volt power condition before •Control board LED is off 115 volt power •No 24 volt... - Page 21 TROUBLESHOOTING Green Amber Symptoms Fault Description Check Cautions LED Code LED Code LED Code •Temperature rise, duct static, •Furnace does not •Four •Open limit circuit, main •Confirm electrically safe gas pressure, burner alignment, operate, four Red •None •None repeating limit, aux limit, or roll out condition before orifice plate position, wiring to flashes on control board...
- Page 22 Diagnostic Chart will flash three green flashes when the memory has been Refer to the Troubleshooting Chart in the back of this manual cleared. for assistance in determining the source of unit operational The ignition control is equipped with a momentary push problems.
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Page 23: Servicing
SERVICING CHECKING THERMOSTAT CHECKING VOLTAGE 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 SERVICING CHECKING TRANSFORMER AND CONTROL CHECKING AIR CIRCULATOR BLOWER MOTOR CIRCUIT (MULTI-SPEED ECM MOTOR) A step-down transformer 120 volt primary to 24 volt second- WARNING ary, 40 VA (Heating and Cooling Models) supplies ample capacity of power for either operation. ISCONNECT POWER BEFORE SERVICING.
- Page 25 SERVICING CHECKING TEMPERATURE RISE CHECKING DUCT STATIC The more air (CFM) being delivered through a given fur- The maximum and minimum allowable external static nace, the less the rise will be; so the less air (CFM) being pressures are found in the specification section. These delivered, the greater the rise.
- Page 26 SERVICING CHECKING PRIMARY LIMIT CONTROL heat, the furnace will go into lockout for one hour. The RED LED will display a FOUR flash code during this time. All primary limit controls are nonadjustable, automatic The control board can be reset by cycling 115 volt power reset, bi-metal type limit control.
- Page 27 SERVICING AUXILIARY LIMIT CONTROL VOLT / OHM METER LIMIT BLOWER HOUSING RESET BUTTON AUXILIARY LIMIT CONTROL COLOR IDENTIFYING Auxiliary Limit Control Location Testing Auxiliary Limit Control WARNING HIGH VOLTAGE ISCONNECT POWER BEFORE SERVICING OR INSTALLING THIS UNIT. ULTIPLE POWER SOURCES MAY BE PRESENT.
- Page 28 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. FLAME HIGH VOLTAGE ROLLOUT SWITCHES ISCONNECT POWER BEFORE SERVICING OR INSTALLING THIS UNIT. ULTIPLE POWER SOURCES MAY BE PRESENT.
- Page 29 SERVICING CHECKING MAIN BURNERS WARNING Burners have been redesigned for 34.5" chassis furnaces. Overall length and width dimensions remain the same as ALL G ISCONNECT AS AND LECTRICAL OWER UPPLY. 40" model burners. The burners used 34.5" models have burner head insert with larger diameter center hole and a 1.
- Page 30 SERVICING Gas Manifold Pressure Measurement and Ad- Open to Atmosphere justment Only small variations in gas pressure should be made by ad- High Fire Regulator Outlet Adjust justing the gas valve pressure regulator. The manifold pressure Regulator Pressure Boss must be measured with the burners operating. To measure Vent and adjust the manifold pressure, use the following procedure.
- Page 31 SERVICING 9. Close thermostat “R”, “W1” and “W2” contacts to pro- Common Terminal(C) vide a call for high stage heat. High Fire Coil 10. Remove regulator cover screw from the high (HI) Terminal (HI) outlet pressure regulator adjust tower and turn screw Low Fire Coil clockwise to increase pressure or counterclockwise Terminal (LO)
- Page 32 SERVICING The pressure control is a safety device to prevent the Manifold Gas Pressure combustion cycle from occurring with inadequate venting caused by a restricted or blocked vent pipe. Rate Range Nominal High Stage 3.2 to 3.8" w.c. 3.5" w.c. Natural Gas Low Stage 1.6 to 2.2"...
- Page 33 In some areas the gas supplier may artificially derate the period is 4 seconds. gas in an effort to compensate for the effects of altitude. If Goodman ® Brand and Amana® Brand Two-Stage the gas is artificially derated the appropriate orfice size must 1.
- Page 34 SERVICING order and that the heating system functions appropriately. Pay particular attention to the following items. Repair or service as necessary. • Flue pipe system. Check for blockage and/or leakage. Check the outside termination and the connections Flame Current at and internal to the furnace. Solder Pads •...
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Page 35: Maintenance
MAINTENANCE TEST EQUIPMENT Filter Sizing Chart Proper test equipment for accurate diagnosis is as essential Model Minimum Recommended Filter Size^ as regular hand tools. *MEC960303AN* 1 - 16 X 25 Side or 1 - 14 X 25 Bottom The following is a must for every service technician and *MEC960403AN* 1 - 16 X 25 Side or 1 - 14 X 25 Bottom *MEC960603AN*... -
Page 36: Wiring Diagrams
WIRING DIAGRAMS WARNING:DISCONNECT POWER BEFORE SERVICING. WIRING TO UNIT MUST BE PROPERLY POLARIZED AND GROUNDED. ECM MTR HARNESS CIRCULATOR BLOWER EQUIPMENT GND FIELD GND FIELD SPLICE SWITCH (TEMP.) IGNITER SWITCH (PRESS.) OVERCURRENT PROT. DEVICE JUNCTION TERMINAL INTERNAL TO INTEGRATED CONTROL PLUG CONNECTION LOW VOLTAGE (24V) LOW VOLTAGE FIELD... - Page 37 Product Registration page. Our continuing commitment to quality products may mean a change in specifications without notice. 5151 San Felipe Suite 500 • Houston, TX 77056 www.goodmanmfg.com • www.amana-hac.com © 2019 Goodman Manufacturing Company, L.P...
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Questions and answers
HOW TO CHECK THE MANIFOLD PRESSURE ON A GOODMAN GMEC800403ANAA IT DOES NOT HAVE A SERVICE PORT TO CHECK THE PRESSURE, ONLY A PLASTIC PLUG BUT NO ALLEN SCREW TO LOOSEN
To check the manifold pressure on a Goodman GMEC80 without a service port, follow these steps:
1. Turn off the gas to the furnace using the manual gas shutoff valve external to the furnace.
2. Connect a calibrated water manometer or appropriate gas pressure gauge to the gas piping drip leg or the gas valve inlet pressure tap, as shown in the diagram for the White-Rodgers Model 36J54 gas valve.
3. Turn the gas back on and operate the furnace with the burners on.
4. Measure the manifold pressure using the connected manometer while the burners are firing.
Make sure all connections are tight and leak-free during measurement.
This answer is automatically generated