TECHNICAL MANUAL
GMH95
40" 95% Gas Furnace
•Refer to Service Manual RS6610004 for installation, operation, and troubleshooting information.
•All safety information must be followed as provided in the Service Manual.
•Refer to the appropriate Parts Catalog for part number information.
•Model numbers listed on page 3.
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.
Copyright © 2007, 2009-2010 Goodman Manufacturing Company, L.P.
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RT6612018Rev.5
April 2010
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.
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95 |
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Brand: |
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Minior |
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G: Goodman |
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Revision |
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A: Revision |
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Air Flow Direction |
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M:Upflow/Horizontal |
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D: Dedicated Downflow |
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Major Revision |
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C: Downflow/Horizontal |
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A: Initial Release |
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H: Hi Air Flow |
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Description |
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NOx |
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H: Dual$aver, Multi Speed |
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N: Natural Gas |
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V: Two Stage/Variable Speed |
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X: Low NOx |
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AFUE |
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Cabinet Width |
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9: 90% |
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95: 95% |
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A: 14" |
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B: 17 1/2" |
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C: 21" |
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KBTUH |
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D: 24 1/2" |
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045: |
45,000 |
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070: |
70,000 |
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Maximum CFM @ 0.5" ESP |
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090: |
90,000 |
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3: |
1200 |
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115: |
115,000 |
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4: |
1600 |
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140: |
140,000 |
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5: |
2000 |
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WARNING |
HIGH VOLTAGE! |
Disconnect ALL power before servicing or installing this unit. Multiple power |
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sources may be present. Failure to do so may cause property damage, personal |
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injury or death. |
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WARNING |
Goodman will not be responsible |
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for any injury or property damage |
arising from improper service or service procedures. If you install or perform service on this unit, you assume responsibility for any personal injury or property damage which may result. Many jurisdictions require a license to install or service heating and air conditioning equipment.
Installation and repair of this unit
WARNING should be performed ONLY by individuals meeting the require-
ments of an "entry level technician", at a minimum, as specified by the Air-Conditioning, Heating, and Refrigeration Institute (AHRI). Attempting to install or repair this unit without such background may result in product damage, personal injury or death.
2
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.
GMH950453BXA*
GMH950703BXA*
GMH950704CXA*
GMH950904CXA*
GMH950905DXA*
GMH951155DXA*
WARNING |
The United States Environmental Protection Agency (“EPA”) has issued various regulations re- |
garding the introduction and disposal of refrigerants introduced into this unit. Failure to follow |
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these regulations may harm the environment and can lead to the imposition of substantial fines. |
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These regulations may vary by jurisdiction. Should questions arise, contact your local EPA office. |
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WARNING |
Do not connect or use any device |
that is not design certified by |
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Goodman for use with this unit. |
Serious property damage, personal injury, reduced unit performance and/or hazardous conditions may result from the use of such non-approved devices.
WARNING To prevent the risk of property damage, personal injury, or death,
do not store combustible materials or use gasoline or other flammable liquids or vapors in the vicinity of this appliance.
3
PRODUCT DESIGN
General Operation
The GMH95 furnaces are equipped with an electronic ignition device used to light the burners and an induced draft blower to exhaust combustion products.
An interlock switch prevents furnace operation if the blower door is not in place. Keep the blower access door in place except for inspection and maintenance.
This furnace is also equipped with a self-diagnosing electronic control module. In the event a furnace component is not operating properly, the control module LED will flash on and off in a factory-programmed sequence, depending on the problem encountered. This light can be viewed through the observation window in the blower access door. Refer to the Troubleshooting Chart for further explanation of the LED codes and Abnormal Operation - Integrated Ignition Control section in the Service Instructions for an explanation of the possible problem.
The rated heating capacity of the furnace should be greater than or equal to the total heat loss of the area to be heated. The total heat loss should be calculated by an approved method or in accordance with “ASHRAE Guide” or “Manual J-Load Calculations” published by the Air Conditioning Contractors of America.
*Obtain from: American National Standards Institute 1430 Broadway New York, NY 10018
Location Considerations
•The furnace should be as centralized as is practical with respect to the air distribution system.
•Do not install the furnace directly on carpeting, tile, or combustible material other than wood flooring.
•When suspending the furnace from rafters or joists, use 3/8" threaded rod and 2” x 2” x 3/8” angle as shown in the Installation and Service Instructions. The length of the rod will depend on the application and clearance necessary.
•When installed in a residential garage, the furnace must be positioned so the burners and ignition source are located not less than 18 inches (457 mm) above the floor and protected from physical damage by vehicles.
Notes:
1.Installer must supply one or two PVC pipes: one for combustion air (optional) and one for the flue outlet (required). Vent pipe must be either 2” or 3” in diameter, depending upon furnace input, number of elbows, length of run and installation (1 or 2 pipes). The optional Combustion Air Pipe is dependent on installation/code requirements and must be 2” or 3” diameter PVC.
2.Line voltage wiring can enter through the right or left side of the furnace. Low voltage wiring can enter through the right or left side of furnace.
3.Conversion kits for high altitude natural or propane gas operation are available. See High Altitude Derate chart for details.
4.Installer must supply the following gas line fittings, depending on which entrance is used:
Left -- Two 90º Elbows, one close nipple, straight pipe. Right -- Straight pipe to reach gas valve.
Accessibility Clearances (Minimum)
MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS (INCHES)
POSITION* FRONT SIDES REAR TOP FLUE FLOOR
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Upflow |
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0 |
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1 |
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Horizontal |
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0 |
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All positioning is determined as installed unit is viewed from the front. |
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If placed on combustible floor, floor MUST be wood only. |
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NC= For instalaltion on non-combustible floors only. A non-combustible subbase must be used for installations on combustible flooring.
24" at front is required for servicing or cleaning.
Note: In all cases accessibility clearance shall take precedence over clearances from the enclosure where accessibility clearances are greater. All dimensions are given in inches.
High Altitude Derate
When this furnace is installed at high altitude, the appropriate High Altitude orifice kit must be installed. This is required due to the natural reduction in the density of both the gas fuel and combustion air as altitude increases. The kit will provide the proper design certified input rate within the specified altitude range.
P ROPANE AND HIGH ALTITUDE KITS
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M ODEL |
0 to |
7,001 to |
9,001 to |
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NUM BER |
7,000 ft. |
9,000 ft. |
11,000 ft. |
11,000 ft. |
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LPM-05 1 |
HANG11 |
HANG12 |
HALP 10 |
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LPM-06 2 |
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GM H95*****XA* |
H igh Altitude |
H igh Altitude |
H igh Altitude |
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Propane |
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N atural Gas Kit |
N atural Gas Kit |
LP Gas Kit |
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C onvers ion Kit |
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(#55 Orifices ) |
(#44 Orifices ) |
(#45 Orifices ) |
(#56 Orifices ) |
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1 |
LP M -05* s upports W hite-Rodgers 2-s tage valves only |
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LP M -06* s upports Honey well and W hite-Rodgers 2-stage valves |
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High altitude kits are purchased according to the installation altitude and usage of either natural or propane gas. Refer to the chart above for a tabular listing of appropriate altitude ranges and corresponding manufacturer’s high altitude Natural Gas and Propane Gas kits. For a tabular listing of appropriate altitude ranges and corresponding manufacturer's High Altitude Pressure Switch kits, refer to either the Pressure Switch Trip Points & Usage Chart in this manual or the Accessory Charts in Service Instructions.
4
COMPONENT IDENTIFICATION
Upflow/Horizontal |
1 |
Gas Valve |
17 |
Electrical Connection Inlets (Alternate) |
2 |
Gas Line Entrance (Alternate) |
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Coil Front Cover Pressure Tap |
3 |
Pressure Switch |
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Coil Front Cover Drain Port |
4 |
Gas Manifold |
20 |
Drain Line Penetrations |
5 |
Combustion Air Intake Connection / “Coupling” |
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Drain Trap |
6 |
Hot Surface Igniter |
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Blower Door Interlock Switch |
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Rollout Limit |
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Capacitor |
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Burners |
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Integrated Control Module |
9 |
Flame Sensor |
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(with fuse and diagnostic LED) |
10 Flue Pipe Connection / “Coupling” |
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24-Volt Thermostat Connections |
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Flue Pipe (Internal) |
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Transformer (40 VA) |
12 |
Primary Limit |
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Circulator Blower |
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Gas Line Entrance |
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Auxiliary Limit |
14 Flue Pipe Connection (Alternate) |
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Junction Box |
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Rubber Elbow |
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Electrical Connection Inlets |
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Induced Draft Blower |
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Coil Front Cover |
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