Goodman Mfg GMH95 User Manual

TECHNICAL MANUTECHNICAL MANU

TECHNICAL MANU

TECHNICAL MANUTECHNICAL MANU

ALAL

AL

ALAL

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.

®

C

RT6612018 Rev. 5

US

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.

G

Brand:

G: Goodman

Air Flow Direction

M:Upflow/Horizontal
D: Dedicated Downflow
C: Downflow/Horizontal
H: Hi Air Flow

Description

H: Dual$aver, Multi Speed
V: Two Stage/Variable Speed

M

H

AFUE

9: 90%

95: 95%

KBTUH

045: 45,000
070: 70,000
090: 90,000
115: 115,000
140: 140,000

95

045

3

Maximum CFM @ 0.5" ESP

3: 1200
4: 1600
5: 2000

A

XA

NOx

N: Natural Gas
X: Low NOx

Cabinet Width

A: 14"
B: 17 1/2"
C: 21"
D: 24 1/2"

A

Minior
Revision

A: Revision

Major Revision

A: Initial Release

WARNING

WARNING

WARNING

WARNING

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.

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.

Goodman will not be responsible
for any injury or property damage

2

Installation and repair of this unit

WARNING

WARNING

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.

should be performed
individuals meeting the require-

ONLY by

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

WARNING

WARNING

WARNING

Serious property damage, personal injury, reduced unit
performance and/or hazardous conditions may result
from the use of such non-approved devices.

The United States Environmental Protection Agency (“EPA”) has issued various regulations re­garding the introduction and disposal of refrigerants introduced into this unit. Failure to follow
these regulations may harm the environment and can lead to the imposition of substantial fines.
These regulations may vary by jurisdiction. Should questions arise, contact your local EPA office.

Do not connect or use any device
that is not design certified by
Goodman for use with this unit.

WARNING

WARNING

do not store combustible materials or use gasoline or
other flammable liquids or vapors in the vicinity of this
appliance.

To prevent the risk of property
damage, personal injury, or death,

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

Upflow30010C

Horizontal 3 6 0 6 0 C

*= All positioning is determined as installed unit is viewed from the front.
C= If placed on combustible floor, floor MUST be wood only.
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 prece-

dence 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.

MODEL

NUMBER

GMH95*****XA*

1

LPM -05* supports White-Rodgers 2-stage valves only

2

LPM -06* supports Honeywell and W hite-Rodgers 2-stage valves

PRO PAN E AND HIGH ALT ITUDE KIT S

0 to

7,000 ft.
LPM-05

LPM-06

Propane

Conversion Kit

(#55 Orifices)

1
2

High Altitude

Natural Gas Kit

(#44 Orifices)

7,001 to

9,000 ft.

HANG11

High Altitude

Natural Gas Kit

(#45 O rifice s)

9,001 to

11,000 ft.

HANG12

7,001 to

11,000 ft.

HALP 10

High Altitude

LP Gas Kit

(#56 Orifices)

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
2 Gas Line Entrance (Alternate)
3 Pressure Switch
4 Gas Manifold
5 Combustion Air Intake Connection / “Coupling”
6 Hot Surface Igniter
7 Rollout Limit
8 Burners

9 Flame Sensor
10 Flue Pipe Connection / “Coupling”
11 Flue Pipe (Internal)
1 2 Primary Limit
13 Gas Line Entrance
14 Flue Pipe Connection (Alternate)
15 Rubber Elbow
16 Induced Draft Blower

17 Electrical Connection Inlets (Alternate)
18 Coil Front Cover Pressure Tap
19 Coil Front Cover Drain Port
20 Drain Line Penetrations
21 Drain Trap
22 Blower Door Interlock Switch
23 Capacitor
24 Integrated Control Module

(with fuse and diagnostic LED)
25 24-Volt Thermostat Connections
26 Transformer (40 VA)
27 Circulator Blower
2 8 Auxiliary Limit
29 Junction Box
30 Electrical Connection Inlets
31 Coil Front Cover

5