Goodman Mfg RT6621031r2, GMS8 User Manual

TECHNICAL MANUTECHNICAL MANU

TECHNICAL MANU

TECHNICAL MANUTECHNICAL MANU

GMS8 33-3/8" Gas Furnace Unit s

80% AFUE, Single Stage,

Multi-Speed, Upflow Horizontal

• Refer to Service Manual RS6612006 for troubleshooting information.

• Refer to the appropriate Parts Catalog for part number information.

• Model numbers listed on page 3.

ALAL

AL

ALAL

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 performed by an unqualified
person.

Copyright © 2013 Goodman Manufacturing Company, L.P.

RT6621031r2

November 2013

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.

GMS 8 040 3AXAA

PRODUCT

TYPE:

G: Goodman

SUPPLY TYPE

M: Upflow/ H orizontal

FURNACE

TYPE

S: Single-Stage/

Multi-Speed

AFUE

8: 80%

NOMINAL I NPUT

040: 40,000 Bt uh
060: 60,000 Bt uh
080: 80,000 Bt uh
100: 100,000 Bt uh
120: 120,000 Bt uh
140: 140,000 Bt uh

AIRFLOW

CAPABILITY

3: 1200
4: 1600
5: 2000

CABINET

WIDTH

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

MAJOR REVI SION

A: In itia l Rele ase

MI NOR REVIS I ON

A: Initial Release

ADDITIONAL

FEATURES

N: Nat ural Gas
X: Low NOx

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.

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

HIGH VOLTAGE!

WARNING

WARNING

individuals meeting the requirements of an "entry level
technician" 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.

Installation and repair of this unit
should be performed

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.

GMS80403A*BB

GMS81405DNCC

GMS80603A*BB
GMS80604B*BB
GMS80804B*BB
GMS80805C*BB
GMS81005C*BB

GMS81205D*BA

*These models available in Natural Gas and Low NOx.

WARNING

WARNING

WARNING

WARNING

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. Serious

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 GMS8 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 inner
blower door is not in place. Keep the blower access door in
place except for inspection and maintenance. (See illustra-

tion on pages 5 and 6.)

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 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:

WARNING

O PREVENT POSSIBLE PERSONAL INJURY OR D EATH DUE TO ASPHYXIATION,

T

THIS FURNACE MUST BE

ATEGORY

C

VENT IN G.

III

ATEGORY I VENT ED. DO NOT VENT USING

C

NFPA 54/ANSI Z223.1 - latest edition. In Canada, the fur­naces must be vented in accordance with the National Stan­dard of Canada, CAN/CSA B149.1 and CAN/CSA B149.2 ­latest editions and amendments.

NOTE: The vertical height of the Category I venting system
must be at least as great as the horizontal length of the
venting system.

Accessibility Clearances (Minimum)

Unobstructed front clearanace of 24" for servicing is rec­ommended.

MINIMUM CLEARANCE TO COMBUSTIBLE MATERIALS - INCHES

Sides TopRear Front*

103 6 1 1

* 24" clearnace for serviceability recommended.
** Single Wall Vent (SW) to be used only as a conncetor.

Refer to the venting tables outlined in the Installation Manual for
additional venting requirements.

Vent

SW B

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

IMPORTANT NOTE: The furnace as shipped requires no
change to run between 0 - 5500 feet. Do not attempt to
increase the firing rate by changing orifices or increasing
the manifold pressure below 5500 feet. This can cause poor
combustion and equipment failure.

High altitude installations above 5500 feet may require both
a pressure switch and an orifice change. These changes
are necessary to compensate for the natural reduction in
the density of both the gas fuel and the combustion air at
higher altitude.

For installations above 5500 feet, please refer to your dis­tributor for required kit(s). Contact the distributor for a tabu­lar listing of appropriate manufacturer’s kits for propane gas
and/or high altitude installations. The indicated kits must be
used to insure safe and proper furnace operation. All conver­sions must be performed by a qualified installer, or service
agency.

Category I Venting is venting at a non-positive pressure. A
furnace vented as Category I is considered a fan-assisted
appliance and the vent system does not have to be “gas
tight.” NOTE: Single stage gas furnaces with induced draft
blowers draw products of combustion through a heat ex­changer allowing, in some instances, common venting with
natural draft appliances (i.e. water heaters). All installations
must be vented in accordance with National Fuel Gas Code

4