Goodman GMSS920402BNAA, GMSS920603BNAA, GMSS920803BNAA, GMSS920804CNAA, GMSS920805CNAA User Manual

Service Instructions

GMSS9*/GCSS9*/AMSS9*/ ACSS9*

Single Stage Gas Furnaces

and Accessories

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. The material in this manual does not supercede manufacturer's installation and operation instructions.

is a registered trademark of Maytag Corporation or its related companies

and is used under license to Goodman Company, L.P., Houston, TX. All rights reserved.

Copyright © 2014 Goodman Manufacturing Company, L.P.

RS6612012

August 2014

TABLE OF CONTENTS

IMPORTANT INFORMATION..........................2 - 6

PRODUCT IDENTIFICATION..........................7-11

INSTALLATION CONSIDERATIONS ..........12 - 30

SYSTEM OPERATION ......................................31

SERVICING TABLE OF CONTENTS ................38

TROUBLESHOOTING.................................42- 43

SERVICING ..................................................44- 54

MAINTENANCE ............................................55- 57

ACCESSORIES...........................................32- 37

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. Products should be serviced only by a qualified service
technician who is familiar with the safety procedures required in the repair and who is equipped with the proper tools,
parts, testing instruments and the appropriate service manual. REVIEW ALL SERVICE INFORMATION IN THE

APPROPRIATE SERVICE MANUAL BEFORE BEGINNING REPAIRS.

IMPORTANT NOTICES FOR CONSUMERS AND SERVICERS

RECOGNIZE SAFETY SYMBOLS, WORDS AND LABELS

WARNING

T

O PREVENT THE RISK OF PROPERTY DAMAGE, PERSONAL INJURY, OR DEATH,

DO NOT STORE COMBUSTIBLE MATER IALS OR USE GASOLINE OR OTHER

FLAMMABLE LIQUIDS OR VAPORS IN THE VICINITY OF THIS APPLIANCE.

WARNING

G

OODMAN WILL NOT BE RESPONSIBLE FOR ANY INJURY OR PROPERTY DAMAGE ARISING FROM IMPROPER SERVICE OR SERVICE PROCEDURES.

I

F YOU INSTALL OR PERFORM SERVICE ON THIS UNIT, YOU ASSUME RESPONSIBILITY FOR ANY PERSONAL INJURY OR PROPERTY DAMAGE WHICH

MAY RESULT.

M

ANY JURISDICTIONS REQUIRE A LICENSE TO INSTALL O R SERVICE HEATING AN D AIR CONDITIONING EQUIPMENT.

WARNING

HIGH VOLTAGE
D

ISCONNECT ALL POWER BEFORE SERVICING OR

INSTALLING THIS UNIT.

BE PRESENT.

DAMAGE, PERSONAL INJURY OR DEATH.

FAILURE TO DO SO MAY CAUSE PROPERTY

MULTIPLE POWER SOURCES MAY

2

IMPORTANT INFORMATION

Special Warning for Installation of Furnace or Air Handling Units in
Enclosed Areas such as Garages, Utility Rooms or Parking Areas

Carbon monoxide producing devices (such as an automobile, space
heater, gas water heater, etc.) should not be opera ted in enclosed areas
such as unventilated garages, utility rooms or parking areas because of
the danger of carbon monoxide (CO) poisoning resulting from the exhaust
emissions. If a furnace or air handler is installed in an enclosed area s uch
as a garage, utility room or parking area and a carbon monoxide producing
device is operated therei n, there must be adequate, direct outside
ventilation.

This ventilation is necessary to avoid the danger of CO poisoning which
can occur if a carbon monoxide producing device continues t o operate in
the enclosed area. Carb on monoxide emissions can be (re)circu lated
throughout the structure if the furnace or air handler is operating in any
mode.

CO can cause serious illness including permanent brain damage or death.

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

GOODMAN® BRAND PRODUCTS

TOLL FREE

1-877-254-4729 (U.S. only)

email us at:

[e-mail]

fax us at: [phone]

email us at: [e-mail]

CONSUMER INFORMATION LINE

AMANA® BRAND PRODUCTS

TOLL FREE

1-877-254-4729 (U.S. only)

fax us at: [phone]

(Not a technical assistance line for dealers.)

(Not a technical assistance line for dealers.)

Outside the U.S., call 1-713-861-2500.

(Not a technical assistance line for dealers.) Your telephone company will bill you for the call.

3

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IMPORTANT INFORMATION

FOR YOUR SAFETY

READ BEFORE OPERATING

If you do not follow these instructions

WARNING:

explosion may result causing propertyexactly, a fire or

damage, personal injury or

loss of life.

A. This appliance does not have a pilot. It is equipped
with a n ignition device which au t o matically lights
to light the burner by hand.

th e burner. Do no t try
B. smell all aroun d the appliance

BEFORE OPERATING

area for gas. Be sure to smell next to the floor
bec ause some gas is heavier than air and will
settle on the floor.

WHAT TO DO IF YOU SMELL GAS

Do not tr y to light any appliance.
Do not touch any electric switch;
do not use any phone in your building.
Immediately call your gas supplier from a neighbor's
phone. Follow the gas supplier's instructions.
If you cannot re ach your gas supplier,
call the fire department.

C. Use only your hand to push in or turn the gas control lever.
Never use tools. If the lever will not push in or turn by
hand, don't try to repair it, call a q ualified service
technician. Forc e or attempted repair may result in a fire
or explosion.

D.

Do not use this appliance if any part has been underwater.
Immediately ca ll a qu a l ified service technician to inspect
th e appliance and to rep lace any part of the control
system and any ga s control which has been underwater.

LIRE AVANT DE METTRE

EN MARCHE LIRE

AVERTISSEMENT:

la lettre les instructions dans le presén t manuel
risque de déclencher un incendie ou une exp losion
entraînant des dommages matériels, des lesions
corporelles ou la perte de vies humaines.

Cet appareil ne comp orte pas de veilleuse. Il est

A.

muni d'un dispositif d'allumage qui allume
automatiquemen t le brûleur. Ne pas tenter
d'allumer le brûleur manuellement.

B. AVANT DE LE FAIRE FONCTIONNER,

renifler tout autour de l'ap pariel pour decéler
une odeur de gaz. Renifler prés du plancher, car
certains gaz son t plus lourds que l'air et
peuv en t s'accumuler au niveau du sol.

QUE FAIRE S'IL Y A UNE ODEUR DE GAZ

Ne pas tenter d'allumer d'appareils.

Ne

toucher à au c un interrupteur; ne pas vous servir

des téléphone s dans le bâtiment.
Appelez immédiatement votre fo urnisseur de gaz depuis

un voisin. Suivez les instructions du fournisseur de gaz

Si vous ne pouvez rejoindre le fournisseur de gaz,

appelez le service des incendies.»
C. Ne pousser ou tourner la ma nette d'admission du gaz
qu'à la main. Ne jamais emploer d'outil à cette fin.

Si la manette reste coincée, ne tenter pas de la
réparer; appel e z un technicien qualifié. Quiconque
te nte de forcer la m anette ou de la réparer peut
provoquer un e explosion ou un incendie.»

D. Ne pas se servir de cet appareil s'il a été plongé dans
l'eau, même partiellement. Fa ir e inspecter l'appareil
par un technici en qualifié et remplacer toutr partie du

systéme de contrôle et toute commande qui ont été
plongées dans l'eau.»

Quiconque ne re specte pas à

OPERATING INSTRUCTIONS

1. Re ad the safety inform ation abov e on

STOP.

th i s label.

2. Set the thermostat to lowest se tting.

3. Turn of f all electric power to the appliance.

4. This appliance is eq uipped with an ignition
device which automatically lights the burner.
Do not try to light the burner by hand.

5. Push the gas control leve r to Position.
Do not force.

6. Wait five (5) minute s to clear out any gas. Then
sme ll for gas, including near the floor. If you
th en smell gas, Follow
in the safety information above
on this label if you don 't smell
gas, go to ne xt step.

7. Push gas control lever
to

"ON".

8. Replace access panel.

9. Turn on all electric
power to the appliance.

10. Set thermostat to desired setting.

11. If the appliance wil l not operate,
follow the instructions “To Turn
Off Gas To Applianc e " and call your
servi c e tec hnician or gas company.

STOP. "B"

"OFF”

GAS
INLE T

ARRIVEE

DU GAZ

ROBINET A GAZ
MANUEL, EN POS
"ON/MARCHE"

MANUAL GAS
LEVER SHOWN
IN "ON" POS

TO TURN OFF GAS TO APPLIANCE

1. Set the thermostat to lowest setting.

2. Turn off all electric power to the appliance
if service is to be performed.

3. Push the gas control l ever to Position.

Do not force.

4. Replace control access panel.

"O FF”

MISE EN MARCHE

1. Lisez les instructions de sécurité dans la

ARRÊTEZ

section supérieure de cette étiquette.

.

2. Régler le thermostat à la température la plus basse.

3. Couper l'alimentation électrique de l'appareil.

4. Cet appareil me n ager etant dote d'un systeme
d'allumage au t om atiqu e , ne pas essayer à
allumer le brûleur manuellement.

5. Po usse le levier du contrÔle du gaz a

position.

6. Attendre cinq (5) minutes pour laisser echapper tout le
gaz. Renifler tout autour de l'appareil, y compris prés du

plancher, pour déceler une odeur de gaz. Si c ' est le ca s,
Passer à l'etape B des instructions de securite

ARRÊTEZ.

sur la portion su perieure de cette etiquette.
S'il n'y a pas d'odeur de ga z , passer à l'etàpe suivante.

7. P o u sse l e le v i e r du contrôle du gaz à

position.

8. Remettre en place le pann eau d'accés.

9. Mettre l'appareil sous tension.

10. Régler le thermostat à la température désirée.

11. Si l'appareil ne se met pas en marche, suivre les
instructions intitulées Comment couper l' ad mi ssion
de gaz de l'appareil et appeler un technicien
qualifié ou le fo urnisseur de gaz.

"OFF/ ARRET”

"ON/MARCHE”

POUR COUPER L'ADMISSION
DE GAZ DE L'APPAREIL

1. Régler le thermostat à la température la plus bassé.

2. Couper l'alimentation él ectrique de l'appareil s'il
faut procéder à des operations d'entretien.

3. Pousse le levier du contrôle du gaz à
position.
Ne pas forcer.

4. Remettre en place le panneau d'accés.

"OFF/ ARRET"

0140F00681 R EV A

5

IMPORTANT INFORMATION

FOR YOUR SAFETY READ BEFORE OPERATING

If you do not follow these instructions exactly,
a fire or explosion may result causing property
damage, personal injury or loss of life.

A. This appliance does not have a pilot. It
is equipped with an ignition device which
automatically lights the burners. Do n
try to light the burners by hand.

B. BEFORE OPERATING smell around
the appliance area for gas. Be sure to
smell next to the floor because some gas
is heavier than air and will settle on the
floor.

WHAT TO DO IF YOU SMELL GAS

Do not try to light any appliance.
Do not touch any electric switch;
do not use any telephone in your
building.
Immediately call your supplier
from a neighbor's phone. Follow
the gas suppliers instructions.

ot

If you cannot reach your gas supplier,
call the fire department.

C. Use only your hand to move the gas
control switch or knob. Never use
tools. If the gas control switch or knob
will not operate, don't try to repair it,
call a qualified service technician.
Force or attempted repair may result in
a fire or explosion.

D. Do not use this appliance if any part
has been under water. Immediately call
a qualified service technician to inspect
the appliance and to replace any part of
the control system and any gas control
which has been under water.

OPERATING INSTRUCTIONS

1. STOP! R e ad the safety information
above on this label.

2. Set the thermostat to lowest setting.

3. Turn off all electric power to the
appliance.

4. This appliance is equipped with an
automatic ignition system which
automatically lights the burne rs. Do n
try to light the burners by hand.

5. Remove con trol access panel.

6. Move the gas control switch or knob
to "OFF".

GAS CONTROL
SWIT C H SHO W N
IN "ON" POSIT ION

ot

7. Wait five (5) minutes to clear out any
gas. If you then smell gas, STOP!
Follow "B" in the safety information
above on this label. If you don't smell
gas, go to the next step.

8. Move the gas control switch or knob
to "ON".

9. Replace control access panel.

10. Turn on all electric power to the
appliance.

11. Set the thermostat to the desired
setting.

12. If the appliance will not operate,
follow the instructions "To Turn Off Gas
To Appliance" and call your service
technician or gas supplier.

TO TURN OFF GAS TO APPLIANCE

1. Set the thermostat to its lowest setting.

2. Turn off all electric power to the
appliance if service is to be performed.

3. Remove control access panel.

4. Move the gas control switch or knob
to "OFF". Do not force.

5. Replace control access panel.

WARNING:

installation, adjustme nt,
alteration, service or
maintenance can
cause injury or
property damage.
Refer to the user's
information manual
provided with this
furnace. For assistance
or additional information
consult a qualified
installer, servi ce ag ency
or the gas supplier.

This furnace must be
installed in accordance
with the manufacturers
instructions and local
codes. In the absence
of local codes, follow
the National Fuel Gas

Code, ANSI Z223.1.

WARNING:

installed, operated
and maintained in
accordance with the
manufacturer's
instructions, this
product could expose
you to substances
in fuel combustion
which can cause
death or serious
illness and which
are known to the
State of California to
cause cancer, birth
defects or other
reproductive harm.
This product contains
fiberglass insulation.
Fiberglass insulation
contains a chemical
known by the State of
California to cause
cancer.

Improper

If not

FOR YOUR SAFETY

Do not store or use gasoline or

other flammable vapors and liquids in the vicinity of this
or any other appliance.

6

0140F00688 Rev A

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.

* M S S 96 060 3 B N A A
1 2 3 4 5 6 7 8 9 10 11 12 13 14

Brand Minor Revision
A- Amana® G- Goodman® A - Initia l Releas e

Configuration
M - U pflow/Horizontal Ma jor Revision
C - Downflow/Horizontal A - Initia l Releas e
K - Dedicated Upflow B - 1 st Revision
D - Dedicated Downflow

Airflow N - Natur a l Gas
C - Variable Speed/ComfortNet X - Low Nox
E - High Efficiency
S - Single Speed Cabinet W idth

Gas Valve S tages B - 17.5"
M - Modulating C - 21"
V - 2 Stage D - 24.5"
H - Convertible 2 Stage
S - Single Stage Maximum CFM

AFUE 4 - 1600 CFM
97 - 97% AFUE 5 - 2000 CFM
80 - 80% AFUE

B - 1 st Revision

Nox

A - 14"

3 - 1200 CFM

MBTU/h
040 - 40,00 0
060 - 60,00 0
080 - 80,00 0
100 - 100,000
120 - 120,000

7

PRODUCT IDENTIFICATION

MODEL # MFG # DESCRIPTION

GMSS920402BNAA

GMSS92

GMSS920603BNAA
GMSS920803BNAA
GMSS920804CNAA
GMSS920805CNAA
GMSS921004CNAA
GMSS921005CNAA
GMSS921205DNAA

Goodman® Brand 92% Single Stage Gas Furnace.

Installation, 1- stage gas valve induced draft. PSC motor . 120- volt silicon carbide
17-second hot sur fac e ignit ion. Left or r ight gas pipe ent r y. The furnace also
feat ures an aluminized steel tubular heat exchanger. A vailable cabinet widt hs
are 17.5", 21", and 24.5 " wide .

34.5" tall, Upf low/ Horizontal

GCS S 9 2

GMSS96

GCS S 9 6

GCSS9204 02BNAA
GCSS9206 03BNAA
GCSS920804CNAA
GCSS921005CNAA

GMSS960402BNAA
GMSS960603BNAA
GMSS960803BNAA
GMSS960804CNAA
GMSS960805CNAA
GMSS961005CNAA
GMSS961205DNAA

GCSS9604 02BNAA
GCSS9606 03BNAA
GCSS960804CNAA
GCSS 961005CNAA
GCSS961205DNAA

Goodman® Brand 92% Single Stage Gas Furnace.

Downflow/Horizontal Installation, 1-stage gas valve induced draft. PSC motor.
120-volt silicon carbide 17-second hot sur f ac e ignit ion. Lef t or right gas pipe
entry. T he furnace also features an aluminized steel t ubular heat exchanger.
Available cabinet widths are 17.5" and 21" wide.

Goodman® Brand 96% Single Stage Gas Furnace.

Inst allation,1-st age ga s v al ve induced dr af t. PSC mot or . 120 volt silic on c ar bid e
17-second hot sur fac e ignit ion. Left or r ight gas pipe ent r y. The furnace also
feat ures an aluminized steel tubular heat exchanger. A vailable cabinet widt hs
are 17.5" 21" and 24.5" wide.

Goodman® Brand 96% Single Stage Gas Furnace.

Downflow/Horizontal Installation, 1-stage gas valve induced draf t. PSC motor.
120-volt silicon carbide 17-second hot sur f ac e ignit ion. Lef t or right gas pipe
entry. T he furnace also features an aluminized st eel t ubular heat exchanger.
Available cabinet widths are 17.5" , 21", and 24. 5" wide.

34.5" tall,

34.5" tall, Upf low/ Horizontal

34.5" tall,

8

PRODUCT IDENTIFICATION

MODEL # MFG # DESCRIPTION

AMSS920402BNAA

AMSS92

AMSS920603BNAA

AMSS920803BNAA
AMSS920804CNAA
AMS S 92 0805 CN AA
AMS S 92 1004 CN AA
AMSS921005CNAA
AMSS921205DNAA

®

Ama na

34.5 " tall, 1 - st age gas valv e in duced draft. PSC mot or. 1 20- volt silicon c arbide 17­second hot surface ignit ion. Left or right ga s pipe entry . The f urnace also f ea tures
a stainless steel tubular he at exc h ange r . Available c abi ne t widt h s are 17.5", 21",
and 24. 5" wid e.

Brand 92% Single Stage Gas Furnace.

Upflow/Horiz ontal Installation,

ACSS92

AMSS96

ACSS96

ACSS920402BNAA

ACSS920603BNAA
ACSS920804CNAA
ACSS921005CNAA

AMSS960402BNAA

AMSS960603BNAA

AMSS960803BNAA
AMSS960804CNAA
AMS S 96 0805 CN AA
AMSS961005CNAA
AMSS961205DNAA

ACSS960402BNAA

ACSS960603BNAA
ACSS960804CNAA
ACSS961005CNAA
ACSS961205DNAA

®

Ama na

34.5 " tall, 1 - st age gas valv e in duced draft. PSC mot or. 1 20- volt silicon c arbide 17­second hot surface ignit ion. Left or right ga s pipe entry .The f ur n ac e al so fe atures
a stainless steel tubular he at exc h ange r . Available c abi ne t widt h s are 17 .5" and
21" wi de .

Ama na

34.5 " tall, 1 - st age gas valv e in duced draft. PSC mot or. 1 20- volt silicon c arbide 17­second hot surface ignit ion. Left or right ga s pipe entry . The f urnace also f ea tures
a stainless steel tubular he at exc h ange r . Available c abi ne t widt h s are 17 .5" 21"
& 24.5 wide.

Ama na

Inst allation, 34.5" tall, 1-stage gas valve induced dra ft. PSC motor . 120- volt
silicon car bi de 17 - secon d ho t surface ignit io n. Left or right gas pipe e ntry . The
furnace also featur es a stainless st eel t ubular heat exchanger. Available cabinet
widths are 17.5", 21", and 24. 5" wide.

Brand 92% Single Stage Gas Furnace

®

Brand 96% Single Stage Gas Furnace

®

Brand 96% Single Stage Gas Furnace

. Downflow/Horiz ontal Installation,

. Upflow/Horiz ontal Installation,

. Downflow/Horizontal

9

PRODUCT IDENTIFICATION

MODEL # MFG # DESCRIPTION

AFE18-60A

AMU1 620
AMU1 625
AMU2 020
AMU2 025

GMU1620
GMU1625
GMU2020
GMU2025

ASAS-10
ASAS-11
ASAS-12
ASAS-18

CFSB17
CFSB21
CFSB24

N/A

P1251305F
P1251306F
P1251307F
P1251308F

N/A

P1251301F
P1251302F
P1251303F
P1251304F

N/A

Fossil Fuel Kit.

located above/downstr eam of a g as or f o ssil fuel furnac e whe n used wit h a heat pump.
It will operate w ith single and two stage heat pumps and single and two st a ge
furnaces. The AFE18-60A contr ol wi ll turn the heat pump unit off wh en the furnac e is
turned on. An anti-short c ycle f ea ture initiates a 3 minute timed off delay when the
compressor goes off .

Me dia Air Clea ner.

pollen and other mic roscopic par ticles from the air passing through it. Flexible
performance rang e up to 2,000 CFM capacit y. T h e a ir c lea ner should be installed in the
system so that all the sy ste m air is circ u lated through the air cleaner . T he air c le aner
will only remove the airborne contaminants delivered t o i t. Maximum perf ormance is
obtai ned w hen the system blower is set f or continu ous operation. Carbon filters
(optional) ar e available.

Electronic Air Cleaner.

remove air c on taminants down to .01 micr on s. Car bon filt er s (optional) remov e o dor s.
Dual indicator lights show unit operation at a glance. E le c tronic proving switch c ycles
the a ir cleaner On/Off with the system fan. Durable pow der - coat paint finish resists
corrosion.

Counterflow Subbase Kit

are available for t he following furnac e widt h s: 17. 5 " wide ( CF S B 17) , 21" wide (CF S B21 )
and 24. 5" wide (CFS B 2 4) . The kits must be used t o prevent excessive temperat ur e
from reaching c ombustible mater ials, if the fu r nace is installed on a combustible floor.
This subbase effectively separa ted the fu r nace base and plenum from combustible
materials. To ensur e safe install ation, do not inst all the counter flow floor base direc tly
on car peting, t ile, or other combustible material other than wood flooring.

The AFE 18 - 60A control is d esigned f or use where t he indo or c oi l is

A high eff ic i enc y air filt r ation devi c e designed t o remove dir t, dust,

The Hi gh- Efficiency Elect r oni c Air Cleaner is designed to

. For use with 34.5" down flow furnac e models. These kits

10

PRODUCT IDENTIFICATION

MODEL # MFG # DESCRIPTION

DCVK-20

(CVENT-2)

DCVK-30

(CVENT-3)

N/A

Concentric Vent Kit

to be "concentrically" vented through a w all or r oof. Th is kit allows a single penetration
to support terminations f or both the ve nt/flue an d the combustion air intake pipe.

. This k it is designed to allow terminations of a direct vent furnace

EFR02

0170K00000S

0170K00001S

LPLP03

LPM-0 7

RF000142

N/A

N/A

N/A

N/A

N/A

N/A

External Filter Rack Kit

provide a locat io n, external to the furnac e casing for inst alla tion of a per manent filter.
The rack is mounted over t he indo or a ir b lower c ompartment area of e ither side panel,
and provide filter ret ention as well a s a location for attaching r eturn air ductwork.

Side W all Only Concentr ic Vent Kit

The vent kit must t er minat e ou tside the str uc ture. This kit is NOT intended for use wit h
single pipe (indirect vent) installat io ns.

Side W all Only Concentr ic Vent Kit

vent kit must te r minat e ou tside the struc ture. This kit is NO T intended f or u se wit h
single pipe (indirect vent) installat io n

LP Gas Low Pressure Kit

monitors gas line pressure with a pr essure switch and will open the circuit to the gas
valve if the LP tank pressur e gets low.

LP Conversion Kit

kit c ont ai ns an L.P . gas valve and a set of six L.P. or if i ce s.

Drain Coupling Kit

horizontal left installat ion . This kit pr event s condensate from getting in the induc er and
routes the cond ensate to a drain.

. For use with 34. 5" up flow gas fur naces. Thi s kit is intended to

. This kit is to be used with 2" - 3" vent sy stems.

. This kit is to be used with 2" vent systems. The

. D esigned f or use with f ur nac es converted to L P ga s. The kit

Converts a 34.5" single sta ge furnace t o ope r ate on L.P. gas. The

For use when the dr ain /vent elbow has been r emoved in a

11

INSTALLATION CONSIDERATIONS

Safety

Please adhere to the following warnings and cautions when
installing, adjusting, altering, servicing, or operating the fur­nace.

WARNING

T

O PREVENT PERSONAL INJURY OR DEATH DUE TO IMPROPER INSTALLATION,

ADJUSTMENT, ALTERATI ON, SERVICE OR MAINTENANCE, REFER TO THIS

MANUAL.

QUALIFIED INSTALLER, SERVICE AGENCY OR THE GAS SUPPLIER.

OR ADDITIONAL ASSISTANCE OR INFORMATION, CONSULT A

F

WARNING

HIS PRODUCT CONTAINS OR PRODUCES A CHEMICAL OR CHEMICALS WHICH

T

MAY CAUSE SERIOUS ILLNESS OR DEATH AND WHICH ARE KNOWN TO THE

S

TATE OF CALIFORNIA TO CAUSE CANCER, BI RTH DEFECTS OR OTHER

REPRODUCTIVE HARM.

WARNING

TO PREVENT POSSIBLE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH

DUE TO ELECTRICAL SHOCK, THE FURNACE MUST BE LOCATED TO PROTECT

THE ELECTRICAL COMPO NENTS FROM WATER.

Charge (ESD) Precautions

NOTE: Discharge body’s static electricity before touching

unit. An electrostatic discharge can adversely affect electri­cal components.

Use the following precautions during furnace installation and
servicing to protect the integrated control module from dam­age. By putting the furnace, the control, and the person at
the same electrostatic potential, these steps will help avoid
exposing the integrated control module to electrostatic dis­charge. This procedure is applicable to both installed and
uninstalled (ungrounded) furnaces.

1. Disconnect all power to the furnace. Do not touch the
integrated control module or any wire connected to the
control prior to discharging your body’s electrostatic
charge to ground.

2. Firmly touch a clean, unpainted, metal surface of the
furnace near the control. Any tools held in a person’s
hand during grounding will be discharged.

3. Service integrated control module or connecting wiring
following the discharge process in Step 2. Use caution
not to recharge your body with static electricity; (i.e., do
not move or shuffle your feet, do not touch ungrounded
objects, etc.). If you come in contact with an ungrounded
object, repeat Step 2 before touching control or wires.

4. Discharge any static electricity from your body to ground
before removing a new control from its container. Follow
Steps 1 through 3 if installing the control on a furnace.
Return any old or new controls to their containers before
touching any ungrounded object.

Product Application

This product is designed for use as a residential home gas
furnace. It is not designed or certified for use in mobile home,
trailer, or recreational vehicle applications.

This furnace can be used in the following non-industrial
commercial applications: Schools, Office buildings, Churches,
Retail stores, Nursing homes, Hotels/motels, Common or
office areas. In all applications, the furnace must be installed
per the installation instructions.

Goodman® brand G*SS9* and Amana® brand A*SS9* fur­naces are ETL certified. All furnaces are built for use with
Natural gas but can be converted for use with LP gas.

(NOTE: If using propane gas, a propane conversion kit is
required).

Goodman® brand G*SS9* and Amana® brand A*SS9* high
efficiency furnaces are dual certified. Dual certification means
that the combustion air inlet pipe is optional and the furnace
can be vented as a:

To ensure proper installation, operation and servicing, thor­oughly read the installation and service manuals for specif­ics pertaining to the installation, servicing and application of
this product.

OSSIBLE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH DUE TO FIRE,

P

EXPLOSION, SMOKE, SOOT, CONDENSTAION, E LECTRICAL SHOCK OR CARBON

MONOXIDE MAY RESULT FROM IMPROPER INSTALLATION, REPAIR, OPERATION,

OR MAINTENANCE OF THIS PRODUCT.

T

O PREVENT PROPERTY DAMAGE, PERSONAL INJURY OR DEATH DUE TO FIRE,

DO NOT INSTALL THIS FURNACE IN A MOBILE HOME, TRAILER, OR RECREATIONAL

VEHICLE.

To ensure proper furnace operation, install, operate, main­tain and service the furnace in accordance with the installa­tion, operation and service instructions, all local building
codes and ordinances. In their absence, follow the latest
edition of the National Fuel Gas Code (NFPA 54/ANSI
Z223.1), and/or CAN/CGA B149 Installation Codes, local
plumbing or waste water codes, and other applicable codes.

A copy of the National Fuel Gas Code (NFPA 54/ANSI
Z223.1) can be obtained from any of the following:

Non-direct vent (single pipe) central forced air furnace
in which combustion air is taken from the installation
area or from air ducted from the outside or,

Direct vent (dual pipe) central forced air furnace in which
all combustion air supplied directly to the furnace burn­ers through a special air intake system outlined in
this manual and the installation instructions.

WARNING

WARNING

American National Standards Institute

12

INSTALLATION CONSIDERATIONS

1430 Broadway
New York, NY 10018

National Fire Protection Association
1 Batterymarch Park
Quincy, MA 02269

CSA International
8501 East Pleasant Valley
Cleveland, OH 44131

A copy of the CAN/CGA B149 Installation Codes can be
obtained from:

CSA International
178 Rexdale Boulevard
Etobicoke, Ontario, Canada M9W, 1R3

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.

Location Requirements and Considerations

WARNING

O PREVENT POSSIBLE EQUIPMENT DAMAGE, PROPERTY DAMAGE, PERSONAL

T

INJURY OR DEATH, THE FO LLOWING BULLET POINTS MUST BE OBSERVED

WHEN INSTALLING THE UNIT.

Follow the instructions listed below when selecting a fur­nace location. Refer also to the guidelines provided in the
Combustion and Ventilation Air Requirements section in this
manual or the installation instructions for details.

• Centrally locate the furnace with respect to the pro­posed or existing air distribution system.

• Ensure the temperature of the return air entering the
furnace is between 55°F and 100°F when the furnace
is heating.

• If the furnace is installed in an application where the
typical operating sound level of a furnace is deemed
objectionable, an optional sound reduction kit is avail­able. Consult your local distributor for more details.

• Provide provisions for venting combustion products
outdoors through a proper venting system. Special
consideration should be given to vent/flue pipe routing
and combustion air intake pipe when applicable.

90% Furnaces: Refer to the Vent/Flue Pipe and Com-
bustion Air Pipe -Termination Locations section in this

manual or the installation instructions for appropriate
termination locations. Also for 90% furnaces, refer to
the Vent/Flue Pipe and Combustion Air Pipe -Termi-
nation Locations section in this manual or the instal-

lation instructions to determine if the piping system
from furnace to termination can be accomplished
within the guidelines given. NOTE: The length of flue
and/or combustion air piping can be a limiting factor
in the location of the furnace.

• Locate the 90% furnace so that the condensate can
be piped at a downward slope away from the furnace
to the drain. Do not locate the furnace or its conden­sate drainage system in any area subject to below
freezing temperatures without proper freeze protec­tion. Refer to the Condensate Drain Lines and Trap
section in this manual or the installation instructions
for further details.

• Set the 90% furnace on a level floor to enable proper
condensate drainage. If the floor becomes wet or damp
at times, place the furnace above the floor on a con­crete base sized approximately 1-1/2" larger than the
base of the furnace. Refer to the Horizontal Applica-
tions and Considerations section in this manual or
the installation instructions for leveling of horizontal
furnaces.

• Ensure upflow or horizontal furnaces are not installed
directly on carpeting, or any other combustible mate­rial. The only combustible material allowed is wood.

• A special accessory subbase must be used for up­right counterflow unit installations over any combus­tible material (including wood). Refer to subbase in­structions for installation details. (NOTE: A subbase
will not be required if an air conditioning coil is located
beneath the furnace between the supply air opening
and the combustible floor.

• Exposure to contaminated combustion air will result
in safety and performance-related problems. Do not
install the furnace where the combustion air is ex­posed to the following substances:

chlorinated waxes or cleaners
chlorine-based swimming pool chemicals
water softening chemicals
deicing salts or chemicals
carbon tetrachloride
halogen type refrigerants
cleaning solutions (such as perchloroethylene)
printing inks
paint removers
varnishes
hydrochloric acid
cements and glues
antistatic fabric softeners for clothes dryers
and masonry acid washing materials

• Isolate a nondirect furnace from an area contaminated
by any of the above substances. This protects the
non-direct vent furnace from airborne contaminants.
To ensure that the enclosed non-direct vent furnace

13

INSTALLATION CONSIDERATIONS

has an adequate supply of combustion air, vent from
a nearby uncontaminated room or from outdoors. Re­fer to the Combustion and Ventilation Air Require-
ments section in this manual or the installation in­structions for details.

• If the furnace is used in connection with a cooling
unit, install the furnace upstream or in parallel with
the cooling unit coil. Premature heat exchanger fail­ure will result if the cooling unit coil is placed ahead of
the furnace.

• If the furnace is installed in a residential garage, posi­tion the furnace so that the burners and ignition source
are located not less than 18 inches (457 mm) above
the floor. Protect the furnace from physical damage
by vehicles.

• If the furnace is installed horizontally, the furnace ac­cess doors must be vertical so that the burners fire
horizontally into the heat exchanger. Do not install
the unit with the access doors on the “up/top” or “down/
bottom” side of the furnace.

Clearances and Accessibility

Installations must adhere to the clearances to combustible
materials to which this furnace has been design certified.
The minimum clearance information for this furnace is pro­vided on the unit’s clearance label. These clearances must
be permanently maintained. Refer to Specification Sheet for
minimum clearances to combustible materials. Clearances
must also accommodate an installation’s gas, electrical,
and drain trap and drain line connections. If the alternate
combustion air intake or vent/flue connections are used on
a 90% furnace, additional clearances must be provided to
accommodate these connections. Refer to Vent Flue Pipe
and Combustion Air Pipe section in this manual or the in­stallation instructions for details. NOTE: In addition to the
required clearances to combustible materials, a minimum
of 24 inches service clearance must be available in front of
the unit.

A furnace installed in a confined space (i.e., a closet or
utility room) must have two ventilation openings with a total
minimum free area of 0.25 square inches per 1,000 BTU/hr
of furnace input rating. One of the ventilation openings must
be within 12 inches of the top; the other opening must be
within 12 inches of the bottom of the confined space. In a
typical construction, the clearance between the door and
door frame is usually adequate to satisfy this ventilation re­quirement.

Furnace Suspension

If suspending the furnace from rafters or joist, use 3/8"
threaded rod and 2”x2”x1/8” angle iron as shown in the fol­lowing figure. If the furnace is installed in a crawl space it
must also be suspended from the floor joist or supported by
a concrete pad. Never install the furnace on the ground or
allow it to be exposed to water. The length of rod will depend
on the application and the clearances necessary.

GAS

PIPING

EXISTING FURNACE REMOVAL

NOTE: When an existing furnace is removed from a venting

system serving other appliances, the venting system may
be too large to properly vent the remaining attached appli­ances.

The following vent testing procedure is reproduced from the

American National Standard/National Standard of Canada for
Gas-Fired Central Furnaces ANSI Z21.47, latest edition,
CSA-2.3b, latest edition Section 1.23.1.

The following steps shall be followed with each appliance connected to
the venting system placed in operation, while any other appliances
connected to the venting system are not in operation:

a. Seal any unused openings in the venting system;
b. Inspect the venting system for proper size and horizontal pitch,

c. In so far as practical, close all building doors and windows and all

d. Follow the lighting instructions. Place the appliance being in-

e. Test for draft hood equipped spillage at the draft hood relief

f. After it has been determined that each appliance connected to the

g . If improper venting is observed during any of the above tests, the

2" 2" 1/8"

XX

ANGLE IRON

(3

PLACES

)

90% Suspended Furnace Shown

as required by the National Fuel Gas Code, ANSI Z223.1 or the
CSA B149 Installation Codes and these instructions. Determine
that there is no blockage or restriction, leakage, corrosion and other
deficiencies which could cause an unsafe condition;

doors between the space in which the appliance(s) connected to
the venting system are located and other spaces of the building.
Turn on clothes dryers and any appliance not connected to the
venting system. Turn on any exhaust fans, such as range hoods
and bathroom exhausts, so they shall operate at maximum speed.
Do not operate a summer exhaust fan. Close fireplace dampers;

spected in operation. Adjust thermostat so appliance shall oper­ate continuously;

opening after 5 minutes of main burner operation. Use the flame
of a match or candle;

venting system properly vents when tested as outlined above,
return doors, windows, exhaust fans, fireplace dampers and any
other gas burning appliance to their previous conditions of use;

common venting system must be corrected.

14

INSTALLATION CONSIDERATIONS

Corrections must be in accordance with the latest edition of
the National Fuel Gas Code NFPA 54/ANSI Z223.1 and/or
CSA B149 Installation Codes.

If resizing is required on any portion of the venting system,
use the appropriate table in Appendix G in the latest edition
of the National Fuel Gas Code ANSI Z223.1 and/or CSA B149

Installation Codes.

Thermostat Requirements

A high quality single stage thermostat with a "C" terminal is
recommended to control the G*SS9* and A*SS9* furnace.

Thermostat Location

In an area having good air circulation, locate the thermostat
about five feet high on a vibration-free inside wall. Do not
install the thermostat where it may be influenced by any of
the following:

• Drafts, or dead spots behind doors, in corners, or un­der cabinets.

• Hot or cold air from registers.

• Radiant heat from the sun.

• Light fixtures or other appliances.

• Radiant heat from a fireplace.

• Concealed hot or cold water pipes, or chimneys.

• Unconditioned areas behind the thermostat and de­humidistat, such as an outside wall.

(Section 9.3), or CAN/CGA B149 Installation Codes (Sec­tions 7.2, 7.3, or 7.4), or applicable provisions of the local
building codes for determining the combustion air require­ments for the appliances.

Most homes will require outside air be supplied to the fur­nace area by means of ventilation grilles or ducts connect­ing directly to the outdoors or spaces open to the outdoors
such as attics or crawl spaces.

The following information on air for combustion and ventilation
is reproduced from the National Fuel Gas Code NFPA 54/ANSI

Z223.1 Section 9.3.

9.3* Air for Combustion and Ventilation.

9.3.1 General.

9.3.1.1 Air for combustion, ventilation, and dilution of flue gases for

appliances installed in buildings shall be obtained by application of one
of the methods covered in 9.3.2 through 9.3.6. Where the requirements
of 9.3.2 are not met, outdoor air shall be introduced in accordance with
methods covered in 9.3.3 through 9.3.6.

Exception No. 1: This provision shall not apply to direct vent appliances.

9.3.1.2 Appliances of other than natural draft design and other than
Category 1 vented appliances shall be provided with combustion, ven­tilation, and dilution air in accordance with the appliance manufacturer’s
instructions.

9.3.1.3 Appliances shall be located so as not to interfere with proper
circulation of combustion, ventilation, and dilution air.

COMBUSTION AND VENTILATION AIR
REQUIREMENTS

WARNING

OSSIBLE PROPERTY DAMAGE, PERSONAL I NJURY OR DEATH MAY OCCUR

P

IF THE FURNACE I S NOT PROVIDED WITH ENOUGH FRESH AIR FOR PROPER

COMBUSTION AND VENTILATION OF FLUE GASES. MOST HOMES REQUIRE

OUTSIDE AIR BE SUPPLIED TO THE FURNACE AREA.

Improved construction and additional insulation in buildings
have reduced heat loss by reducing air infiltration and es­cape around doors and windows. These changes have helped
in reducing heating/cooling costs but have created a prob­lem supplying combustion and ventilation air for gas fired
and other fuel burning appliances. Appliances that pull air
out of the house (clothes dryers, exhaust fans, fireplaces,
etc.) increase the problem by starving appliances for air.

When the furnace is installed as a direct vent (2-pipe) fur­nace, no special provisions for air for combustion are re­quired. However, if this furnace is to be installed in the same
space with other gas appliances, such as a water heater,
ensure there is an adequate supply of combustion and ven­tilation air for the other appliances. Refer to the latest edi­tion of the National Fuel Gas Code NFPA 54/ANSI Z223.1

9.3.1.4 Where used, a draft hood or a barometric draft regulator shall be
installed in the same room or enclosure as the appliance served so as to
prevent any difference in pressure between the hood or regulator and the
combustion air supply.

9.3.1.5 Makeup air requirements for the operation of exhaust fans, kitchen
ventilation systems, clothes dryers, and fireplaces shall be considered in
determining the adequacy of a space to provide combustion air require­ments.

9.3.2 Indoor Combustion Air. The required volume of indoor air shall
be determined in accordance with the method in 9.3.2.1 or 9.3.2.2 ex­cept that where the air infiltration rate is known to be less than 0.40
ACH, the method in 9.3.2.2 shall be used. The total required volume
shall be the sum of the required volume calculated for all appliances
located within the space. Rooms communicating directly with the space
in which the appliances are installed through openings not furnished
with doors, and through combustion air openings sized and located in
accordance with 9.3.2.3, are considered a part of the required volume.

9.3.2.1* Standard Method. The minimum required volume shall be 50
ft 3 per 1,000/Btu/hour (4.8m3/kW).

9.3.2.2* Known Air Infiltration Rate Method. Where the air infiltra­tion rate of a structure is known, the minimum required volume shall be
determined as follows:

15

INSTALLATION CONSIDERATIONS

A

(1) For appliances other than fan-assisted, calculate using the following

equation:
Required Volume

> ________ _________

other

(2) For fan-assisted appliances, calculate using the following equation:

Required Volume

> ________ _________

fan

3

21 ft

ACH 1000 Btu/hr

15 ft

ACH 1000 Btu/hr

I

other

(

3

I

fan

(

)

)

ods in 9.3.3.1 or 9.3.3.2. The minimum dimension of air openings shall
not be less than 3 in. (80 mm).

9.3.3.1 Two Permanent Openings Method. Two permanent open­ings, one commencing within 12 in. (300 mm) of the top and one com­mencing within 12 in. (300 mm) of the bottom, of the enclosure shall be
provided. The openings shall communicate directly, or by ducts, with
the outdoors or spaces that freely communicate with the outdoors, as
follows:

where:

I

I

= all appliances other than fan-assisted input in Btu per

other

fan

hour

= fan-assisted appliances input in Btu per hour

ACH = air change per hour (percent of volume of space exchanged

per hour, expressed as a decimal)

(3) For purposes of this calculation, an infiltration rate greater than

0.60 ACH shall not be used in the equations in 9.3.2.2(1) and

9.3.2.2(2).

9.3.2.3 Indoor Opening Size and Location. Openings used to connect
indoor spaces shall be sized and located in accordance with the follow­ing:

(1)*Combining spaces on the same story. Each opening shall have a

minimum free area of 1 in.2/1000Btu/hr (2200 mm2/kW) of the total
input rating of all appliances in the space but not less than 100 in.
(0.60m2). One opening shall commence within 12 in. (300 mm) of
the top, and one opening shall commence within 12 in. (300 mm) of
the bottom, of the enclosure [see Figure A.9.3.2.3(1)]. The mini-
mum dimension of air openings shall be not less than 3 in. (80 mm).

NOTE: Each opening must have
a free area of not less than one
square inch per 1000 BTU of
the total input rating of all equip­ment in the enclosure, but not
less than 100 square inches.

Chimney or Gas Vent

Water
Heater

Furnace

Opening

Opening

Figure A.9.2.3.3.(1) All Combustion Air from Adjacent

Indoor Spaces through Indoor Combustion Air Openings.

(1)*Where directly communicating with the outdoors or where commu-

nicating to the outdoors through vertical ducts, each opening shall
have a minimum free area of 1 in.

2

/4000 Btu/hr (550 min2/kW) of

total input rating of all appliances in the enclosure. [See Figure

A.9.3.3.1(1)(a) and Figure A.9.3.3.1(1)(b).]

Chimney or Gas Vent

Ventilation louvers
(each end of attic)

NOTE: Th e inlet and outlet air
openings must each have a free
area of not less than one sq uare
inch per 4000 BTU of the
total input rating of all equipment
in the enclosure.

Outlet Air

Water
Heater

Furnace

2

lternate

air inlet

Ventilation louvers for
unheated crawl space

Inlet Air

Figure A.9.3.3.1(1)(a) All Combustion Air Fr om Outdoors -

Inlet Air from Ventilated Crawl Space and Outlet Air

to Ventilated Attic.

Chimney or Gas Vent

Ventilation louvers
(each end of attic)

NOTE: The inlet and outlet air
openings must each have a free
area of not less than one square
inch per 4000 BTU of the
total input rating of all equipment
in the enclosure.

Outlet Air

Water
Heater

Furnace

Inlet air duct
[ends 1 ft (300 mm)
above floor]

(2) Combining spaces in different stories. The volumes of spaces in

different stories shall be considered as communicating spaces where
such spaces are connected by one or more openings in doors or
floors having a total minimum free area of 2 in.2/1000 Btu/hr (4400
mm2/kW) of total input rating of all appliances.

9.3.3 Outdoor Combustion Air. Outdoor combustion air shall be pro­vided through opening(s) to the outdoors in accordance with the meth-

(2)*Where communicating with the outdoors through horizontal ducts,

each opening shall have a minimum free area of 1 in.2/2000 Btu/hr
(1100 min2/kW) of total input rating of all appliances in the enclo­sure. [See Figure A.9.3.3.1(2).]

Figure A.9.3.3.1(1)(b) All Combustion Air
From Outdoors through Ventilated Attic.

16

INSTALLATION CONSIDERATIONS

Chimney or Gas Vent

NOTE: The air duct openings
must have a free area of not
less th an one square inch per
2000 BTU of the total input
rating of all equipment in the
enclosure*.

Furnace

Water
Heater

Outlet air duct

Inlet air duct

Figure A.9.3.3.1(2) All Combustion Air From Outdoors

through Horizontal Ducts.

9.3.3.2* One Permanent Opening Method. One permanent open-

ings, commencing within 12 in. (300 mm) of the top of the enclosure,
shall be provided. The appliance shall have clearances of at least 1 in.
(25 mm) from the sides and back and 6 in. (150 mm) from the front of
the appliance. The opening shall directly communicate with the out­doors or shall communicate through a vertical or horizontal duct to the
outdoors or spaces that freely communicate with the outdoors (see
Figure A.9.3.3.2) and shall have a minimum free area of the following:
(1) 1 in.

2

/3000 Btu/hr (700 mm2 per kW) of the total input rating of all

appliances located in the enclosure, and

(2) Not less than the sum of the areas of all vent connectors in the

space.

NOTE: The single op ening must h ave
a free area of not less than one
square inch per 3000 BTU of
the total in put rating of all equi p­ment in t he enclo sure, but not less than
the sum of t he areas of all vent
connectors in the confined space.

Chimney or Gas Vent

Opening

9.3.5 Engineered Installations. Engineered combustion air installa­tions shall provide an adequate supply of combustion, ventilation, and
dilution air and shall be approved by the authority having jurisdiction.

9.3.6 Mechanical Combustion Air Supply . Where all combustion air
is provided by a mechanical air supply system, the combustion air shall
be supplied form outdoors at the minimum rate of 0.35 ft
Btu/hr (0.034 m3/min per kW) for all appliances located within the
space.

9.3.6.1 Where exhaust fans are installed, additional air shall be provided
to replace the exhausted air.

9.3.6.2 Each of the appliances served shall be interlocked to the me­chanical air supply system to prevent main burner operation where the
mechanical air supply system is not in operation.

9.3.6.3 Where combustion air is provided by the building’ s mechanical
ventilation system, the system shall provide the specified combustion
air rate in addition to the required ventilation air.

9.3.7 Louvers, Grilles, and Screens.

9.3.7.1 Louvers and Grilles. The required size of openings for com-

bustion, ventilation, and dilution air shall be based on the net free area of
each opening. Where the free area through a design of louver or grille or
screen is known, it shall be used in calculating the size opening required
to provide the free area specified. Where the louver and grille design and
free area are not known, it shall be assumed that wood louvers will have
25 percent free area, and metal louvers and grilles will have 75 percent
free area. Nonmotorized louvers and grilles shall be fixed in the open
position.

(c) The minimum size of outdoor opening(s) shall be the full size

of outdoor opening(s) calculated in accordance with 9.3.3,
multiplied by the reduction factor. The minimum dimension
of air openings shall not be less than 3 in. (80 mm).

3

/min per 1000

Alternate
Opening
Location

Furnace

Water
Heater

Figure A.9.3.3.2 All Combustion Air

From Outdoors through Single Combustion Air Opening.

9.3.4 Combination Indoor and Outdoor Combustion Air . The use of

a combination of indoor and outdoor combustion air shall be in accor­dance with (1) through (3) (see example calculation in Annex J]:

(1) Indoor Openings: Where used, openings connecting the interior

spaces shall comply with 9.3.2.3.

(2) Outdoor Opening(s) Location. Outdoor opening(s) shall be located

in accordance with 9.3.3.

(3) Outdoor Opening(s) Size. The outdoor opening(s) size shall be

calculated in accordance with the following:

(a) The ratio of the interior spaces shall be the available volume

of all communicating spaces divided by the required volume.

(b) The outdoor size reduction factor shall be 1 minus the ratio of

interior spaces.

9.3.7.2 Minimum Scree Mesh Size. Screens shall not be smaller than
1/4 in. mesh.

9.3.7.3 Motorized Louvers. Motorized louvers shall be interlocked
with the appliance so they are proven in the full open position prior to
main burner ignition and during main burner operation. Means shall be
provided to prevent the main burner form igniting should the louver fail
to open during burner startup and to shut down the main burner if the
louvers close during burner operation.

9.3.8 Combustion Air Ducts. Combustion air ducts shall comply with

9.3.8.1 through 9.3.8.8.

9.3.8.1 Ducts shall be constructed of galvanized steel or a material
having equivalent corrosion resistance, strength, and rigidity.

Exception: Within dwellings units, unobstructed stud and joist spaces
shall not be prohibited from conveying combustion air, provided that
not more than one fireblock is removed.

9.3.8.2 Ducts shall terminate in an unobstructed space, allowing free
movement of combustion air to the appliances.

9.3.8.3 Ducts shall serve a single space.

17

INSTALLATION CONSIDERATIONS

tions. Refer to Vent/Flue Pipe and Combustion Air Pipe

9.3.8.4 Ducts shall not serve both upper and lower combustion air
openings where both such openings are used. The separation between
ducts servicing upper and lower combustion air openings shall be main­tained to the source of combustion air.

9.3.8.5 Ducts shall not be screened where terminating in an attic space.

9.3.8.6 Horizontal upper combustion air ducts shall not slope down-

ward toward the source of combustion air.

9.3.8.7 The remaining space surrounding a chimney liner, gas vent, spe­cial gas vent, or plastic piping installed within a masonry, metal, or
factory built chimney shall not be used to supply combustion air.

Exception: Direct vent appliances designed for installation in a solid
fuel-burning fireplace where installed in accordance with the
manufacture’s installation instructions.

9.3.8.8 Combustion air intake openings located on the exterior of the
building shall have the lowest side of the combustion air intake openings
located at least 12 in. (300 mm) vertically from the adjoining grade level.

section in the installation instructions for details concerning
the conversion to the alternate vent/flue and combustion air
connections on the 90% furnace.

The 34.5" single stage furnace is one of the products in our
newly redesigned line of shorter chassis furnaces. It is avail­able in 92% / 96% AFUE up flow / horizontal model and a
down flow / horizontal model.

The up flow / horizontal 34.5" single stage furnace is avail­able in the following models:

*MSS920402BNAA
*MSS920603BNAA
*MSS9S0803BNAA
*MSS920804CNAA
*MSS920805CNAA
*MSS921004CNAA
*MSS921005CNAA
*MSS921205DNAA

Horizontal Applications and Considerations

Horizontal applications, in particular, may dictate many of
the installation’s specifics such as airflow direction, duct­work connections, flue and/or combustion air pipe connec­tions, etc. The basic application of this furnace as a hori­zontal furnace differs only slightly from an upright installa­tion. When installing a furnace horizontally, additional con­sideration must be given to the following:

Drain Trap and Lines

In horizontal applications the condensate drain trap is se­cured to the furnace side panel, suspending it below the
furnace. A minimum clearance of 5.5" below the furnace
must be provided for the drain trap. Additionally, the appro­priate downward piping slope must be maintained from the
drain trap to the drain location. Refer to Condensate Drain
Trap and Lines section in this manual or the installation
instructions for further details. If the drain trap and drain line
will be exposed to temperatures near or below freezing, ad­equate measures must be taken to prevent condensate from
freezing. NOTE: The use of insulation and/or heat tape is
recommended. Failure to provide proper condensate drain­age can result in property damage.

Leveling

Leveling ensures proper condensate drainage from the heat
exchanger and induced draft blower. For proper flue pipe
drainage, the furnace must be level lengthwise from end to
end. The furnace should also be level from back to front or
have a slight tilt with the access doors downhill (approxi­mately 3/4") from the back panel. The slight tilt allows the
heat exchanger condensate, generated in the recuperator
coil, to flow forward to the recuperator coil front cover.

In horizontal installations with the furnace laying on the left
hand side, the alternate vent connection may be used. In
this configuration the internal elbow is removed. The stan­dard piping connections may also be used in these posi-

*MSS960402BNAA
*MSS960603BNAA
*MSS960803BNAA
*MSS960804CNAA
*MSS960805CNAA
*MSS961005CNAA
*MSS961205DNAA

The down flow / horizontal 34.5" single stage furnace is avail­able in the following models.

*CSS920402BNAA
*CSS920603BNAA
*CSS920804CNAA
*CSS921005CNAA

*CSS960402BNAA
*CSS960603BNAA
*CSS960804CNAA
*CSS961005CNAA
*CSS961205CNAA

18