Goodman GMS8 User manual

RT6622014r3
November2013
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.
•RefertoServiceManualRS6612006fortroubleshootinginformation.
•All safetyinformation must befollowed as providedin the ServiceManual.
•Refertothe appropriate Parts Catalogforpart number information.
•Model numbers listed on page 3.
GMS8 33-3/8" 80% Gas Furnace Units
80% AFUE, Single Stage,
Multi-Speed, Upflow Horizontal
TECHNICAL MANUTECHNICAL MANU
TECHNICAL MANUTECHNICAL MANU
TECHNICAL MANUALAL
ALAL
AL
Copyright ©2011, 2013 GoodmanManufacturingCompany, L.P.
CUS
®

PRODUCT IDENTIFICATION
2
The model and manufacturing number are used for positive identification of component parts used in manufacturing.
Pleaseuse these numberswhenrequesting service orpartsinformation.
WARNING
WARNING 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.
Installation and repair of this unit
should be performed ONLY by
individuals meeting the requirements of an "entry level
technician"asspecifiedbytheAir-Conditioning,Heating,
andRefrigerationInstitute(AHRI). Attemptingtoinstallor
repair this unit without such background may result in
product damage, personal injury or death.
Goodman will not be responsible
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.
WARNING
WARNING WARNING
WARNING
GMS 8 040 3AXAA
SUPPLY TYPE
M: Upflow/Horizontal
FURNACE TYPE
S: Single-Stage/
Multi-Speed
AFUE
8: 80%
A* Revisions
NOMINAL INPUT
040: 45,000 Btuh
060: 70,000 Btuh
080: 90,000 Btuh
100: 115,000 Btuh
120: 140,000 Btuh
AIRFLOW
C
APABILITY
3: 1200
4: 1600
5: 2000
CABINET
WIDTH
A: 14"
B: 17-1/2"
C: 21"
D: 24-1/2"
ADDITIONAL
FEATURES
N: Natural Gas
X: Low NOx
PRODUCT
TYPE:
G: Goodman MAJOR REVISION
A: Initial Release
MINOR REVISION
A: Initial Release
B* Revisions
NOMINAL INPUT
040: 40,000 Btuh
060: 60,000 Btuh
080: 80,000 Btuh
100: 100,000 Btuh
120: 120,000 Btuh

3
PRODUCT IDENTIFICATION
The model and manufacturing number are used for positive identification of component parts used in manufacturing.
Pleaseuse these numberswhenrequesting service orpartsinformation.
GMS80403A*A*
GMS80603A*A*
GMS80604B*A*
GMS80804B*A*
GMS80805C*A*
GMS81005C*A*
GMS81205D*A
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
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.
WARNING
WARNING
Do not connect or use any device
thatisnotdesigncertifiedbyGood-
man for use with this unit. Serious
property damage, personal injury, reduced unit perfor-
mance and/or hazardous conditions may result from the
use of such non-approved devices.
WARNING
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.
WARNING
WARNING
*Thesemodels available inNaturalGas and LowNOx.
GMS80403A*B*
GMS80603A*B*
GMS80604B*B*
GMS80804B*B*
GMS80805C*B*
GMS81005C*B*
GMS81205D*B*

4
PRODUCT DESIGN
NFPA 54/ANSI Z223.1 - latest edition. In Canada, the fur-
nacesmustbeventedinaccordancewiththeNationalStan-
dardof Canada, CAN/CSAB149.1and CAN/CSA B149.2-
latesteditions and amendments.
NOTE: Thevertical height of theCategory I venting system
must be at least as great as the horizontal length of the
ventingsystem.
Accessibility Clearances (Minimum)
Unobstructed front clearanace of 24" for servicing is rec-
ommended.
SW B
103 6 1 1
* 24" clearnace for serviceability recommended.
MINIMUM CLEARANCE TO COMBUSTIBLE MATERIALS - INCHES
** 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
Sides TopRear Front*
Note: Inall cases accessibilityclearance shalltake prece-
denceoverclearancesfromtheenclosurewhereaccessibil-
ityclearancesaregreater. Alldimensionsaregivenininches.
HighAltitudeDerate
IMPORTANT NOTE: The furnace as shipped requires no
change to run between 0 - 4500 feet. Do not attempt to
increase the firing rate by changing orifices or increasing
themanifoldpressurebelow4500feet.Thiscan cause poor
combustionand equipment failure.
Highaltitudeinstallationsabove 4500 feetmayrequireboth
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
higheraltitude.
For installations above 4500 feet, please refer to your dis-
tributorfor required kit(s).Contactthe distributor fora tabu-
lar listing of appropriate manufacturer’s kits for propane
gasand/orhighaltitudeinstallations.Theindicatedkitsmust
be used to insure safe and proper furnace operation. All
conversions must be performed by a qualified installer, or
service agency.
GeneralOperation
TheGMS8furnacesareequippedwithanelectronicignition
deviceusedtolightthe burners and aninduceddraftblower
to exhaust combustion products.
An interlock switch prevents furnace operation if the inner
blowerdoor is notin place.Keep the bloweraccess door in
placeexcept for inspectionand maintenance. (Seeillustra-
tion on pages 5 and 6.)
This furnace is also equipped with a self-diagnosing elec-
tronic control module. In the event a furnace component is
notoperatingproperly,thecontrolmoduleLED will flashon
and off in a factory-programmed sequence, depending on
theproblem encountered. Thislight can beviewedthrough
theobservation window in theblower access door. Referto
theTroubleshootingChart forfurtherexplanationoftheLED
codesand Abnormal Operation -IntegratedIgnitionControl
section in the Service Instructions for an explanation of the
possibleproblem.
Theratedheating capacity ofthefurnace should begreater
thanor equal tothe totalheat loss ofthe area tobe heated.
The total heat loss should be calculated by an approved
methodorin accordance with“ASHRAEGuide” or “Manual
J-LoadCalculations”publishedbytheAirConditioningCon-
tractors of America.
*Obtain from: American National Standards Institute 1430
BroadwayNewYork, NY 10018
LocationConsiderations
• The furnace should be as centralized as is practical
with respect to the air distribution system.
• Donotinstall the furnacedirectlyoncarpeting, tile, or
combustiblematerialother than woodflooring.
• When installed in a residential garage, the furnace
mustbepositionedsotheburnersandignitionsource
are located not less than 18 inches (457 mm) above
the floor and protected from physical damage by ve-
hicles.
Notes:
WARNING
TO PREVENT POSSIBLE PERSONAL INJURY OR DEATH DUE TO ASPHYXIATION,
THIS FURNACE MUST BE CATEGORY IVENTED. DO NOT VENT USING
CATEGORY III VENTING.
CategoryI Venting isventing at anon-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: Singlestagegas furnaces withinduceddraft
blowers draw products of combustion through a heat ex-
changerallowing, in someinstances,common venting with
naturaldraftappliances (i.e. waterheaters).Allinstallations
mustbeventedin accordance withNationalFuelGasCode

5
COMPONENT IDENTIFICATION
Upflow/Horizontal
1 TubularHeatExchanger
2 PressureSwitch
3 FluePipeConnection
4 InducedDraftBlower
5 GasLine Entrance
6 GasValve
7 RolloutLimit
8 JunctionBox
?
Pressure Switch
Tubular Heat Exchanger
Flue Pipe Connection
Gas Line Entrance
(Alternate)
Induced Draft Blower
Gas Line
Entrance
Gas Valve
Rollout Limit
Junction Box
Wiring Harness
Grommet
Gas Manifold
Inshot Burner
Blower Door
Interlock Switch
Integrated Control Module
Transformer Circulator Blower
1
2
3
4
5
6
78
9
9 WiringHarnessGrommet
10 GasManifold
11 InshotBurner
12 Transformer
13 IntegratedControlModule
14 Blower DoorInterlockSwtich
15 CirculatorBlower
16 Gas LineEntrance(Alternate)
Note: Primary Limit Not Shown

PRODUCT DIMENSIONS
6
GMS8
A
lt. Gas Inlet
High Voltage Inlet
Low Voltage
A
lt. Gas Inlet
A
lt. High Voltage
Alt. LowVoltage
MODEL A B
GMS80403A***
GMS80603A***
GMS80604B***
GMS80804B***
GMS80805C***
GMS81005C***
GMS81205D*** 24 - 1/2 23
21 19 - 1/2
14 12 - 1/2
17 - 1/2 16

7
PRODUCT DESIGN
For installations in Canada, the GMS furnaces are certifed only to 4,500 ft.
* Negative pressure readings are in inches of water column (*w.c.)
GMS8***A*
Model
Trip Point
ID Blower
Pressure
Switch
ID Blower
Pressure
Switch
Part #
GMS80403A*A* -0.70 B1370158
GMS80603A*A* -0.70 B1370158
GMS80604B*A* -0.75 B1370179
GMS80804B*A* -0.75 B1370179
GMS80805C*A* -0.75 B1370179
GMS81005C*A* -0.90 0130F00041
GMS81205D*A* -0.80 0130F00042
Pressure Switch Trip Points
Part Number 0130F00035 20162906 20162903 0130F00036
Open Setting (°F) 220 170 160 180
GMS80403A*A* 1 --- --- ---
GMS80603A*A* --- 1 --- ---
GMS80604B*A* --- 1 --- ---
GMS80804B*A* --- --- 1 ---
GMS80805C*A* --- 1 --- ---
GMS81005C*A* --- --- --- 1
GMS81205D*A* --- --- 1 ---
PRIMARY LIMIT
Part Number 10123529
Open Setting (°F) 300
GMS80403A*** 2
GMS80603A*** 2
GMS80604B*** 2
GMS80804B*** 2
GMS80805C*** 2
GMS81005C*** 2
GMS81205D*** 2
ROLLOUT LIMIT SWITCHES Part Number 0130F00038
Open Setting (°F) 120
GMS80403A*** 1
GMS80603A*** 1
GMS80604B*** 1
GMS80804B*** 1
GMS80805C*** 1
GMS81005C*** 1
GMS81205D*** 1
AUXILIARY LIMIT SWITCHES

PRODUCT DIMENSIONS
8
GMS8***B*
Model
Trip Point
ID Blower
Pressure
Switch
ID Blower
Pressure
Switch
Part #
GMS80403A*B* -0.80 0130F00042
GMS80603A*B* -0.80 0130F00042
GMS80604B*B* -0.90 0130F00041
GMS80804B*B* -0.80 0130F00042
GMS80805C*B* -0.80 0130F00042
GMS81005C*B* -0.80 0130F00042
GMS81205D*B* -0.80 0130F00042
Pressure Switch Trip Points
Part Number 20162901 20162904 20162903
Open Setting (°F) 210 150 160
GMS80403A*B* 1------
GMS80603A*B* --- 1 ---
GMS80604B*B* --- 1 ---
GMS80804B*B* --- 1 ---
GMS80805C*B* --- --- 1
GMS81005C*B* --- 1 ---
GMS81205D*B* --- --- 1
PRIMARY LIMIT
Part Number 10123529
Open Setting (°F) 300
GMS80403A*** 2
GMS80603A*** 2
GMS80604B*** 2
GMS80804B*** 2
GMS80805C*** 2
GMS81005C*** 2
GMS81205D*** 2
ROLLOUT LIMIT SWITCHES Part Number 0130F00038
Open Setting (°F) 120
GMS80403A*** 1
GMS80603A*** 1
GMS80604B*** 1
GMS80804B*** 1
GMS80805C*** 1
GMS81005C*** 1
GMS81205D*** 1
AUXILIARY LIMIT SWITCHES
For installations in Canada, the GMS furnaces are certifed only to 4,500 ft.
* Negative pressure readings are in inches of water column (*w.c.)

9
PRODUCT DESIGN
Coil Matches:
A large array of Amana®brand coils are available for use with the GMS8 furnaces, in either upflow or horizontal applica-
tions.Thesecoilsareavailableinbothcasedanduncasedmodels (with the option of field installedTXVexpansiondevice).
These 80% furnaces match up with the existing Amana®brand coils as shown below.
Coil Matches (for Goodman®units using R22 and R-410A):
• All CAPF coils in B, C, & D widths have insulated blank off plates for use with one size smaller furnaces.
• All CAPF coils have a CAUF equivalent.
• All CHPF coils in B, C & D heights have an insulated Z bracket for use with one size smaller furnace.
• All proper coil combinations are subject to being ARI rated with a matched outdoor unit.
C A P F 1824 A 6 A
PRODUCT
TYPE:
C: Indoor Coil
CABINET FINISH:
U: Unpainted
P: Painted
N: Unpainted Case
EXPANSION
DEVICE:
F: Flowrater
NOMINAL CAPACITY RANGE
@ 13 SEER
1824: 1 1/2 to 2 Tons
3030: 2 1/2 Tons
3636: 3 Tons
3642: 3 to 3 1/2 Tons
4860: 4 & 5 Tons
REVISION
A: Revision
NOMINAL WIDTH FOR GAS FURNACE
A:Fits14" FurnaceCabinet
B: Fits 17 1/2" Furnace Cabinet
C: Fits 21" Furnace Cabinet
D: Fits 24 1/2" Furnace Cabinet
N: Does Not Apply (Horizontal SlabCoils)
APPLICATION
A: Upflow/Downflow Coil
H: Horizontal A Coil
S: Horizontal Slab Coil
REFRIGERANT
CHARGE:
6: R-410A or R-22
2: R-22
4: R-410a

10
PRODUCT DESIGN
Thermostats:
Filters:
Filters are required with this furnace and must be provided by the installer. The filters used must comply with UL900 or
CAN/ULCS111standards. Installing thisfurnacewithout filters willvoid the unitwarranty
Upflow Filters
Cabinet
Width
(in.)
Nominal
Filter Size
(in.)
Approx.
Flow Area
(in2)
Cabinet
Width
(in.)
Nominal
Filter Size
(in.)
Approx.
Flow Area
(in2)
All 16 x 25 x 1 400 17-1/2 14 x 25 x 1 350
21 16 x 25 x 1 400
24-1/2 20 x 25 x 1 500
BOTTOM RETURNSIDE RETURN
RefertoMinimumFilterAreatablestodeterminefilterarearequirement.NOTE:Filterscanalsobeinstalledelsewherein
the duct system such as a central return.
Disposable Minimum Filter Area (in2)
[Based on a 300 ft/min filter face velocity]
*Minimum filter area dictated by heating airflow requirement. *Minimum filter area dictated by heating airflow requirement.
Permanent Minimum Filter Area (in2)
[Based on 600 ft/min filter face velocity]
600 800 1000 1200 1400 1600 2000
0604__XA --- --- 564* 564* 672 768
0605__XA --- --- --- 752* 752* 768 960
1005__XA --- --- --- 940* 940* 940* 960
600 800 1000 1200 1400 1600 2000
0604__XA --- --- 641* 641* 672 768 ---
0805__XA --- --- --- 854* 854* 854* 960
Input__Airflow
UPFLOW
COOLING AIRFLOWREQUIREMENT (CFM)
COUNTERFLOW
COOLING AIRFLOWREQUIREMENT (CFM)
Input
Airflow
600 800 1000 1200 1400 1600 2000
0604__XA --- --- 627* 627* 672 768 ---
0805__XA --- --- --- 836* 836* 836* 960
1005__XA --- --- --- 940* 940* 940* 960
600 800 1000 1200 1400 1600 2000
0604__XA --- --- 320* 320* 336 384 ---
0805__XA --- --- --- 427* 427* 427* 480
UPFLOW
COOLING AIRFLOW REQUIREMENT (CFM)
COUNTERFLOW
COOLING AIRFLOW REQUIREMENT (CFM)
Input
Airflow Input__Airflow
It is recommended that a single-stage heat, non-power robbing thermostat be used. Refer to the product marketing
literaturefor a completelist of thermostatsoffered.