Thermo Pride CLQS1-050T36N User manual

CONDENSING GAS QUADPOISE FURNACE
INSTALLATION AND OPERATION MANUAL
SINGLE STAGE
CLQS1-050T36N
CLQS1-075T42N
CLQS1-100T48N
CLQS1-125T60N
PLEASE READ THESE INSTRUCTIONS PRIOR TO INSTALLATION, INITIAL FIRING, AND
BEFORE PERFORMING ANY SERVICE OR MAINTENANCE. THESE INSTRUCTIONS MUST
BE LEFT WITH THE HOMEOWNER AND SHOULD BE RETAINED FOR FUTURE REFERENCE
BY QUALIFIED SERVICE PERSONNEL.
THERMO PRODUCTS, LLC.
P.O. BOX 237
DENTON, NC 27239
MG-1052
ECN 55 0-MA 190515 MADE IN USA

All in tallation and ervice mu t be performed by qualified ervice per onnel.
2
INDEX
SECTION BEGINNING PAGE
I. SAFETY INFORMATION 3
II. FURNACE SPECIFICATIONS
A. CLQS1 SERIES (SINGLE STAGE, CONSTANT TORQUE MOTOR)
B. INSTALLATION PARTS PACKAGES - CLQS1 9
III. GENERAL INSTALLATION 10
A. CODES AND CLEARANCES 10
B. FURNACE LOCATION 12
C. REPLACING EXISTING FURNACE FROM A COMMON VENT 12
D. GENERAL REQUIREMENTS - QUADPOISE CONFIGURAION 12
E. GENERAL REQUIREMENTS FOR VENTING 13
F. SIDEWALL VENTING 17
G. CONNECTING FURNACE TO ROOF VENT / INTAKE TERMS. 22
H. CONNECTING FURNACE TO VENT / INTAKE TERMS. 23
I. CONDENSATE DRAIN LINE & TRAP ASSY. 27
J. GENERAL GAS PIPING 33
K. REQUIREMENTS & SIZING OF DUCTWORK 36
L. FILTERS 37
M. WIRING 40
N. AUXILIARY LIMIT 42
O. TWINNING 43
IV. STARTING THE UNIT 44
A. SEQUENCE OF OPERATIONS 44
B. INITIAL START-UP 46
C. ADJUSTMENT OF BTU INPUT RATE 46
D. BURNER ADJUSTMENT 49
E. FURNACE CHECKOUT PROCEDURE 49
V. INSTALLER’S INSTRUCTIONS TO USER 50
VI. TROUBLESHOOTING 51
APPENDIX
A. REPLACEMENT PARTS LIST 56
B. WIRING DIAGRAMS 59
C. SPEED SPECIFICATIONS 60

All in tallation and ervice mu t be performed by qualified ervice per onnel.
3
THIS FURNACE MUST BE INSTALLED SO THERE
ARE PROVISIONS FOR VENTILATING AIR.
CETTE CHAUDIÈRE DOIT ÊTRE INSTALLÉE DE
MANIÈRE À ASSURER UN AIR DE VENTILATION.
I. SAFETY INFORMATION
This and the following page contain reproductions of the various warning and instruction labels placed on
the Thermo Pride Condensing Gas Furnaces. Please read and comply with the contents of these labels.

All in tallation and ervice mu t be performed by qualified ervice per onnel.
4
bWARNING
CAUTION
Moving parts.
Can cause severe personal injury.
Shut off fur ace before removi g this pa el.
Filter mai te a ce: Whe it becomes
ecessary to replace or wash filter remove
the dirty filter from the racks provided a d
wash or replace with ide tical ew filters.
Do not remove t is label
WHAT TO DO IF YOU SMELL GAS:
1. Do not try to light any appliance.
2. Do not touch any electrical switch; do not use any
phone in your building.
3. Immediately call your gas supplier from a
neighbor's phone. Follow the gas supplier's
instructions.
4. If you cannot reach your gas supplier; call the fire
department.
FOR YOUR SAFETY
b ATTENTION
AVERTISSEMENT
Les pièces mobiles peuvent blesser gravement des
personnes.
rrêter la chaudière avant d'enlever ce panneau.
Mai te a ce des filtres : Qua d il le faut,
retirer les filtres e crassés de leurs boîtiers,
les laver ou les remplacer par des filtres
eufs ide tiques.
Ne pas enlever cette étiquette
POUR VOTRE SÉCURITÉ
FIRE AN EXPLOSION HAZAR
Can result in serious injury or death.
Do not store or use gasoline or other flammable vapors
and liquids in the vicinity of this or any other appliance.
Storage of or use of gasoline or other flammable vapors
or liquids in the vicinity of this or any appliance can result
in serious injury or death.
bWARNING
SPECIAL HOMEOWNERS INSTRUCTIONS
INSTRUCTIONS SPÉCIALES POUR LES PROPRIÉTAIRES
RISQUES 'INCEN IE ET 'EXPLOSION
Peuvent entraîner des blessures sérieuses ou la mort.
Ne pas stocker ou utiliser d'essence ni autres vapeurs ou
liquides inflammables à proximité de cet appareil ou tout
autre dispositif.
Le stockage ou l'utilisation d'essence ou autres vapeurs
ou liquides inflammables à proximité de cet appareil ou
tout autre dispositif peut entraîner des blessures
sérieuses ou la mort.
b AVERTISSEMENT
This and the previous page contain reproductions of the various warning and instruction labels placed on
the Thermo Pride Condensing Gas Furnaces. Please read and comply with the contents of these labels.

All in tallation and ervice mu t be performed by qualified ervice per onnel.
5
WARNING: If you do not follow t ese instructions exactly, a
fire or explosion may result causing property damage,
personal injury or loss of life.
1. Set t ermostat to lowest setting, and, if equipped, set t e operating
mode to "COOL" or "OFF".
2. If service is to be performed, turn off all electric power to t e
appliance.
3. To turn off gas control valve, remove t e burner compartment cover.
4. Move t e gas control switc to t e "OFF" position.
5. Replace t e burner compartment cover.
1. STOP! Read t e safety information above on t is label.
2. Set t e t ermostat to t e lowest setting.
3. Turn off all electric power to t e appliance.
4. T is appliance is equipped wit a ot surface igniter t at
automatically lig ts t e burner. Do not try to lig t t e burner by
and.
5. Move t e gas control switc to t e "OFF" position.
6. Wait five (5) minutes to clear out any gas. T en smell for gas,
including near t e floor or ground. If you smell gas, STOP! Follow
"B" in t e safety information above on t is label. If you don't smell
gas, go to t e next step.
7. Move t e gas control switc to t e "ON" position.
8. Turn on all electric power to t e appliance.
9. Set t ermostat to desired setting, and, if equipped, set t e operating
mode to "HEAT".
10.If appliance will not operate, follow t e instructions "To Turn Off
Gas To Appliance" and call your service tec nician or gas supplier.
A. T is appliance does not ave a pilot. It is equipped wit a ot
surface igniter t at automatically lig ts t e burner. Do not try to
lig t t e burner by and.
B. BEFORE OPERATING smell all around t e appliance area for gas.
Be sure to smell next to t e base of unit because some gas is
eavier t an air and will settle on t e floor or ground.
WHAT TO DO IF YOU SMELL GAS
? Do not try to lig t any appliance.
? Do not touc any electric switc ; do not use
any p one in your building.
? Immediately call your gas supplier from a
neig bor's p one. Follow t e gas supplier's
instructions.
? If you cannot reac your gas supplier, call t e fire department.
C. Use only your and to move t e gas control switc . Never use tools.
If t e switc will not move by and, don't try to repair it, call a
qualified service tec nician. Force or attempted repair may result in
a fire or explosion.
D. Do not use t is appliance if any part as been underwater.
Immediately call a qualified service tec nician to inspect t e
appliance and to replace any part of t e control system and any gas
control w ic as been underwater.
ATTENTION ! Si vous ne respectez pas exactement les instructions ci-dessous, un
incendie ou une explosion pourraient endommager la propriété, blesser ou tuer des
personnes.
390568
1. Réglez le t ermostat à sa position la plus basse et, le cas éc éant, réglez le mode de
fonctionnement à la position «COOL» ou «OFF».
2. S'il faut accomplir une certaine tâc e, coupez toute alimentation en électricité de la
c audière.
3. Pour fermer la valve de commande de gaz, enlevez le couvercle du compartiment du brûleur.
4. Mettez l'interrupteur de commande de gaz à la position «OFF».
5. Replacez le couvercle du compartiment du brûleur.
1. STOP ! Lisez l'information sur la sécurité au aut de cette étiquette.
2. Réglez le t ermostat à sa position la plus basse.
3. Coupez toute l'alimentation électrique la c audière.
4. Cette c audière est équipée d'une surface d'allumage c aude qui allume automatiquement le
brûleur. N'essayez pas d'allumer le brûleur manuellement.
5. Placez l'interrupteur de commande de gaz à la position «OFF».
6. Attendez cinq (5) minutes pour que tout le gaz soit évacué. Humez l'air pour détecter une
éventuelle odeur de gaz, sans oublier de l' umer aussi près du sol ou du planc er. Si vous
sentez une odeur de gaz, STOP ! Suivez le point «B» de l'information sur la sécurité au aut de
cette étiquette. Si vous ne sentez aucune odeur de gaz, passez à l'étape suivante.Move t e gas
control switc to t e "ON" position.
7. Placez l'interrupteur de commande de gaz à la position «ON».
8. Appliquez toute l'alimentation électrique à la c audière.
9. Réglez le t ermostat à la position désirée et, le cas éc éant, mettez le mode de
fonctionnement à la position «HEAT».
10.Si la c audière ne fonctionne pas, suivez les instructions de « POUR COUPER
L'ALIMENTATION EN GAZ DE LA CHAUDIÈRE» et appelez votre tec nicien de service ou votre
fournisseur de gaz.
A. Cet appareil n'a pas de veilleuse. Il comporte une surface d'allumage c aude qui
allume automatiquement le brûleur. N'essayez pas d'allumer le brûleur manuellement.
B. AVANT DE DÉMARRER la c audière, umez l'air autour de l'appareil pour détecter une
éventuelle odeur de gaz. Humez aussi l'air près de la base de la c audière puisque le
gaz étant plus lourd que l'air, il pourrait s'accumuler près du sol ou du planc er.
QUOI FAIRE SI VOUS SENTEZ UNE ODEUR DE GAZ
? N'allumez aucun appareil.
? Ne touc ez aucun interrupteur électrique; n'utilisez aucun télép one dans
l'immeuble.
? Appelez immédiatement votre fournisseur de gaz à partir du télép one d'un voisin.
Suivez ses instructions.
? Si vous ne pouvez pas joindre votre fournisseur de gaz, appelez les pompiers.
C. Manipulez l'interrupteur de commande de gaz seulement à la main. N'utilisez jamais
des outils pour cela. Si vous ne pouvez pas manipuler cet interrupteur manuellement,
n'essayez pas de le réparer, appelez un tec nicien de service qualifié. Forcer
l'interrupteur ou tenter de le réparer, pourraient provoquer un incendie ou une
explosion.
D. N'utilisez pas la c audière si l'une de ses pièces a été sous de l'eau. Appelez
immédiatement un tec nicien de service qualifié pour qu'il inspecte la c audière et
remplace toute pièce du système de commande et tout interrupteur de commande de
gaz qui ont été sous de l'eau.
This and the previous page contain reproductions of the various warning and instruction labels placed on
the Thermo Pride Condensing Gas Furnaces. Please read and comply with the contents of these labels.
This page contains various warnings and cautions found throughout this Furnace Manual. Please read and
comply with the statements below.

All in tallation and ervice mu t be performed by qualified ervice per onnel.
6
The following safety information should be read, understood, and followed by the installer.
1. Use only with type of gas approved for this furnace. Refer to furnace rating plate.
2. Connect this furnace to an approved vent system only. Combustion products must be
discharged outdoors. Connect this furnace to an approved vent system only, as specified in
section III parts D though H of these instructions.
: This furnace is not to be used for temporary heating of buildings or structures under
construction.
: These high efficiency condensing furnaces are not certified for and shall not be vented
into a standard or any type of chimney.
: These furnaces may not be common vented with any other appliance.
: The vent and air intake elbows must be kept away from bushes, shrubs or any vegetation
that may restrict the flow of flue products. It must also be kept clear of any leaves, weeds or other
combustible materials. Keep the vent hood clear of snow. Avoid locating the terminals in areas where
standing water or condensate drippage may be a problem.
: Outside combustion air must not come from an area that is directly ad acent to a pool,
hot tub or spa. Measures should be taken to prevent the entry of corrosive chemicals or vapors to the
combustion and ventilation air supply. Such chemicals include but are not limited to chlorinated
and/or fluorinated hydrocarbons such as found in refrigerants, aerosol propellants, dry cleaning
fluids, degreasers, bleaches, air fresheners or solvents. Vapors from such products can form acid
compounds when burned in a gas flame. Should acid compounds form in your furnace; it may
reduce the life of the furnace.
: Because of the potential of odorant fade, a gas leak may not be detected by smell. If this
furnace is installed below grade, contact your gas supplier for a gas detector.
: Turn off power to furnace before it is placed into service. The gas piping system must
have been leak tested by a qualified heating contractor.
: It may be necessary to purge the air out of the gas line for initial start-up of the furnace
after installation. This should be done by a qualified heating contractor. If excessive gas escapes
when purging the gas supply at the union, allow the area to ventilate for at least 15 minutes before
attempting to start the furnace. LP gas is especially dangerous because the specific gravity of LP gas
allows it to accumulate at floor level at a dangerous concentration. For remainder of operating
instructions, reference Users Information Manual.
: Heat exchanger oil will burn off on initial firing creating an unpleasant odor. To
prevent this odor from occurring more than once, it is suggested that:
1. A window(s) be opened.
2. The thermostat set at highest setting.

All in tallation and ervice mu t be performed by qualified ervice per onnel.
7
3. The furnace remain running at conditions 1&2 for 30 minutes or until odor has dissipated
: These furnace models are a sealed combustion design, which does not require an air
shutter ad ustment (air shutters are not used) for proper flame characteristics. Burner door must
always be closed before operating furnace.
: Personal in ury or property damage could result from repair or service of this furnace by anyone other
than a qualified heating contractor. Only the homeowner/user routine maintenance described in the Users Information
Manual may be performed by the user.
FURNACE MODEL NO. NOMENCLATURE
Model Number Digit 1 2 3 4 5 6 7 8 9 10 11 12
13
Category
Profile
Configuration
Staging
Ver ion
Input Input Input
Motor Type
Clg Airflow Cap
Clg Airflow Cap
Ga Type
Ga Furnace Model Nomenclature Example Model Number C L Q S 1 - 0 5 0 T 3 6 N
C = Conden ing C
L = Low-profile L
Q = Quadpoi e Q
Stage: S = Single, X = 2-Stage S
Ver ion (Rev) 1
Input Capacity in MBTUH (1000) - 0 5 0
Motor Type: T = CTM, E = ECM T
Cooling Airflow Capacity in MBTUH (1000) 3 6
Ga Type: N = Natural, P = Liquid Propane N

All in tallation and ervice mu t be performed by qualified ervice per onnel.
II. FURNACE SPECIFICATIONS
A. CLQS1 SERIES (Single Stage, Con tant Torque Blower Motor)
MODEL NO. CLQS1-050T CLQS1-075T CLQS1-100T CLQS1-125T
BTU/Hr INPUT 50,000 75,000 100,000 125,000
BTU/Hr OUTPUT 4 ,000 73,000 96,000 120,000
HT. OF CASING 34-1/2” 34-1/2” 34-1/2” 34-1/2”
WIDTH OF CASING 17-1/2” 21” 21” 24-1/2”
DEPTH OF CASING 2 -1/2” 2 -1/2” 2 -1/2” 2 -1/2”
WARM AIR OUTLET 16-1/2 x 20 20 x 20 20 x 20 20 x 20
RETURN AIR INLET 25 x 16 25 x 16 25 x 16 25 x 16
DIA. OF FLUE 2” 2” 3” 3”
DIA. OF COMBUSTION
AIR INTAKE 2” 2” 3” 3”
CFM @ 0.2” & 0.5” w.c. STATIC 0.2” - 0.5” 0.2” - 0.5” 0.2” - 0.5” 0.2” - 0.5”
@HI SPEED (BLACK) 1360 - 1193 1531 – 136 1762 – 1547 2047 – 1 2
@MH SPEED (YELLOW) 1167 - 1000 1379 – 1210 155 – 1391 1 13 – 1617
@MED SPEED (BLUE) 9 7 - 797 11 9 – 9 2 1416 – 1229 1710 – 1513
@ML SPEED (PURPLE) 27 - 610 1133 – 933 1357 – 11 6 1553 – 1330
@LO SPEED (RED, HEATING) 672 - 420 1025 – 00 117 – 976 1444 – 11 0
TEMPERATURE RISE 60 60 60 60
BLOWER MOTOR HP 1/2 1/2 3/4 3/4
NO. OF SPEEDS 5 5 5 5
LARGEST RECOMMENDED
AIR CONDITIONER 3 Ton 3.5 Ton 4 Ton 5 Ton
SIZE OF FILTERS 24-3/4” x 15-3/4” 24-3/4” x 15-3/4” 24-3/4” x 15-3/4” 24-3/4” x 19-
3/4”
NOTES:
1. BTU output based on annual fuel utilization efficiency rated by manufacturer.
2. On all outlet and inlet dimensions, the first dimension is width.
3. Electrical characteristics at 120 volts, 60 Hz., 1 phase (less than 15 amps. for all models).
NOTES:
1. BTU output based on annual fuel utilization efficiency rated by manufacturer.
2. On all outlet and inlet dimensions, the first dimension is width.
3. Electrical characteristics at 120 volts, 60 Hz., 1 phase (less than 15 amps. for all models).
4. All specifications are subject to change without notice.

All in tallation and ervice mu t be performed by qualified ervice per onnel.
9
B. INSTALLATION PARTS PACKAGES - CLQS1
PARTS PACKAGE
#S00S4566/4567/
4568/4569
DESCRIPTION PART # QUANTITY
#10-32 x ½ green ground screw 300109 1
#10-32 hex nut 300110 1
Wire nut 300132 2
# x ½ TEK screws for mounting J-box 30020 1
3/16” dia. star washer 300270 1
# x ¾ TEK screws for mounting trap 3002 3 2
Spring clamp, 11/16” 300299 6
Adapter, ½" CPVC X PVC 320 33 1
Trap Assembly 32092 1
Grommet for 2” PVC flue pipe 350007 1
Grommet for ½” gas pipe 350009 1
J-box wire bushing 350016 1
2 x 4 electrical J-box cover 350020 1
2 x 4 electrical J-box 350024 1
Hose clamp for coil outlet tubing 300306 1
Thermostat wire busing 350750 1
Flange for 2” PVC air intake 614524 1
S00S4566 LP Gas Conversion Kit (050) AOPS7746 1
S00S4567 LP Gas Conversion Kit (075) AOPS7747 1
S00S456 LP Gas Conversion Kit (100) AOPS774 1
S00S4569 LP Gas Conversion Kit (125) AOPS7749 1
Installation notice MG-966 1
S00S456 /4569 Tubing 5/16 OD 410061 20”
Tubing 11/16 OD 410060 44”
Barbed elbow 1/2” 3202 5 2
Washer gasket, adhesive backed 330395 2
Formed drain hose, 3” (Tube-A) 410102 1
Formed drain hose, 1 ” (Tube-B) 410103 1
Formed drain hose, 20” (Tube-C) 410104 1
PLENUM ANGLE PACKAGE
DESCRIPTION
S00S4580
(050)
S00S4581
(075)
S00S4582
(100)
S00S4583
(125)
Plenum angle, front 145 7 1 145 7 1 145 7 1 145 7 1
Plenum angle, side 145 6 2 145 6 2 145 6 2 614611 2
Plenum angle, rear 145 6 1 145 6 1 14610 1 14610 1
Plenum angle, side (counterflow) - - - 614612 2
Plenum adapter angle (coil cabinet) 61461 2 - - -
Instruction sheet MG-105 1 MG-105 1 MG-105 1 MG-105 1

All in tallation and ervice mu t be performed by qualified ervice per onnel.
10
III. GENERAL INSTALLATION
Install this furnace only in a location and position as specified in Section III of these instructions.
This furnace may be installed in an Upflow, Downflow or Horizontal configuration. However it is
critically important to make the prescribed changes for each configuration as detailed in this manual for
safe and proper operation.
This furnace is equipped with orifices size for operation with natural gas. For conversion to Propane Gas
see instruction in Gas Conversion Section of this manual.
These Category Type IV furnaces are shipped completely assembled and wired (internally). See the
Dealer Receiving and Freight Claim Procedure Section of the price guide for parts shortage or damage.
The furnace and duct system must be adjusted to obtain a temperature rise of 45°F to 75°F through the
furnace after installation. The recommended minimum return air temperature is 55°F. Always install
furnace to operate within the furnace’s intended temperature rise range with a duct system which has an
external static pressure within the allowable range, as specified in Section III of these instructions. See
furnace rating plate. The installation must conform with local codes, or in the absence of local codes,
with the National Fuel Gas Codes (ANSI Z223.1 or latest edition), and these instructions.
: This furnace is not to be used for temporary heating of buildings or structures under
construction.
Many of the chemicals used during construction, when burned, form acid bearing condensate that can
substantially reduce the life of the heat exchanger.
It is recommended that a commercially available CO alarm be installed in conjunction with any fossil fuel
burning appliance. The CO alarm shall be installed according to the alarm manufacturer’s installation
instructions and be listed in accordance with the latest edition of the UL Standard for Single and Multiple
Station Carbon Monoxide Alarms, UL 2034, or the CSA International Standard, Residential Carbon
Monoxide Alarming Devises, CSA 6.19.
NOTICE: The Thermo Pride emblem is shipped loose with the Installation and Operation manual. The
installer should affix the emblem to the burner door as shown in Figure-101.
A. CODES AND CLEARANCES
The following items must be considered when choosing the size and location of the furnace.
1. All local codes and/or regulations take precedence over the instructions in this manual and should be
followed accordingly. In the absence of local codes, installation must conform with these instructions,
regulations of the National Fire Protection Association, provisions of National Electrical Code
(ANSI/NFPA70 or latest edition), and the National Fuel Gas Code (ANSI Z223.1 or latest edition).

All in tallation and ervice mu t be performed by qualified ervice per onnel.
11
2. The BTU output capacity of the furnace proposed for installation should be based on a heat loss
calculation made according to the manuals provided by the Air Conditioning Contractors of America
(ACCA) or ASHRAE.
3. MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS
UPFLOW
DOWNFLOW
HORIZONTAL
CABINET TOP 1 IN 0 IN 0 IN
CABINET SIDES 0 IN 0 IN 1 IN
CABINET BACK
0 IN
0 IN
0 IN
CABINET BOTTOM 0 IN NON-COMBUSTIBLE BASE REQUIRED 0 IN
CABINET FRONT
6 IN
6 IN
6 IN
PLENUM TOP 1 IN 0 IN 5/8 IN
PLENUM SIDES 5/8 IN 5/8 IN 1 IN
PLENUM BACK
5/8 IN
5/8 IN
5/8 IN
PLENUM BOTTOM 0 IN 1 IN 5/8 IN
PLENUM FRONT
5/8 IN
5/8 IN
5/8 IN
VENT 0 IN 0 IN 0 IN
TABLE 1
Figure 101
The furnaces may be installed on combustible flooring as an Upflow or Horizontal a Non-combustible
base is required in the Downflow configuration. The furnace shall not be installed directly on carpeting or
other combustible material other than wood flooring. These furnaces may be installed in an alcove or in a
closet if the minimum clearances to combustible construction (listed previously) are met. The minimum
clearances are listed for fire protection. Clearance for servicing the front of the furnaces and to all points
on the furnace requiring access must be 24”.
Equipment mu t be in talled in accordance with regulation of the National Board of Fire
Underwriter . Authoritie having juri diction hould be con ulted before in tallation are made.

All in tallation and ervice mu t be performed by qualified ervice per onnel.
12
B. FURNACE LOCATION
: These high efficiency condensing furnaces are not certified for and shall not be vented
into a standard or any type of chimney.
The following shall be considered for locating the furnace:
1. For best performance locate the furnace so that it is centralized with respect to the duct system and as
near as possible to a floor drain since condensate drainage must be provided.
2. Place the unit so that proper venting can be achieved, with a minimum number of elbows, in accord
with the instructions in this manual.
3. The furnace must be located on a level, dry surface. The furnace must be installed so that the
electrical components are protected from water. If the area becomes wet or damp at times, the
furnace should be raised above the floor using a concrete base, bricks, patio blocks, etc.
NOTICE: En ure furnace i level after in tallation to en ure proper drainage and operation.
4. This furnace must be connected to a drain in accordance with these instructions. If it is not practical
to connect the unit to a drain, a condensate pump must be used and can be ordered as an accessory,
part number 350224. If an acid neutralizer kit is required by local code or the customer, it is available
under part number 320095.
5. A Furnace installed in a residential garage must be installed so the burner and ignition source are
located higher than 1 inches above the floor. Also, the furnace must be located or protected to
avoid physical damage by vehicles.
6. A gas fired furnace for installation in a residential garage must be installed as specified in Section III
of these instructions.
C. REPLACING EXISTING FURNACE FROM A COMMON VENT
: These furnaces may NOT be common vented with any other appliance.
D. GENERAL REQUIREMENTS FOR QUADPOISE CONFIGURATIONS
1. UPFLOW (as delivered)
a. Install plenum adapters (4) provided.
2. DOWNFLOW
a. Do not install plenum adapters to the warm air outlet of the furnace. They will not be used.

All in tallation and ervice mu t be performed by qualified ervice per onnel.
13
b. Dual pressure switch assembly MUST be relocated to the blower deck using screws/holes
provided.
c. If furnace is installed on a combustible floor, a non-combustible base must be used.
d. Pressure switch tubing to the coil outlet MUST be moved to the bottom ¼” port of the coil
outlet. On CLQS1-100T4 N & CLQS1-125T60N models the 16” long tubing installed from the
factory MUST be replaced with the 20” piece provided in the parts package. Move ¼” cap to the
unused coil outlet port.
3. HORIZONTAL LEFT
a. Install plenum adapters (4) provided.
b. Aux limit on the blower housing MUST be moved to the motor side using the short bracket
pre-installed on blower housing.
c. Dual pressure switch assembly MUST be relocated to the blower deck using screws/holes
provided.
d. Pressure switch tubing to the coil outlet MUST be moved to the bottom ¼” port of the coil
outlet. On CLQS1-100T4 N & CLQS1-125T60N models the 16” long tubing installed from the
factory MUST be replaced with the 20” piece provided in the parts package. Move ¼” cap to the
unused coil outlet port.
4. HORIZONTAL RIGHT
a. Install plenum adapters (4) provided.
b. Inducer MUST be removed, rotated 1 0° & re-installed so that vent pipe exits cabinet thru the
top.
5. If inducer is to be rotated, first remove front channel into which the doors snap. Then remove inducer,
rotate 1 0° and reinstall. Then reinstall the front door channel being sure to align the front edge with the
front edge of the side casings. Remove yellow cap from rubber drain and move to its top port. Remove
the clear internal support from rubber drain and move to its bottom port.
6. Apply adhesive backed foam washers onto condensate tubing at the exit of the cabinet to seal the gap
created between tubing and knockout.
E. GENERAL REQUIREMENTS FOR VENTING
The furnace venting system must be installed by a qualified service person in accordance with local
installation codes and these instructions. In the absence of applicable local codes, conform to the National
Fuel Gas Code, NFPA 54 /ANSI Z223.1-2002, or latest edition thereof.
Provide adequate combustion and ventilation air to the furnace space as specified in Section III parts D
through H.

All in tallation and ervice mu t be performed by qualified ervice per onnel.
14
Installation shall, at least, conform to the following requirements.
1. The exhaust vent / combustion air intake terminations specified by Thermo Products, in this
manual, shall be used. Both exhaust vent / combustion air intake are to be taken from out of
doors.
2. All plastic pipe and pipefittings sourced to complete the exhaust vent and air intake systems shall
be constructed of rigid PVC (polyvinyl chloride) thermoplastic. All components shall have a wall
thickness equivalent to Schedule 40 series materials.
In addition, all sourced PVC components shall be listed by a nationally recognized testing agency
(e.g. NSF, UL, etc.) as conforming to one (1) or more of the following design standards.
PVC Pipe Designation Design Standard
Cellular Core ASTM-F 91
DWV (Drain-Waste-Vent) ASTM-D2665
Schedule 40 ASTM-D17 5
3. The exhaust vent pipe and combustion air pipe shall be at least as large as the exhaust vent / air
intake pipe specified by Thermo Products. Size reduction i never permi ible. The required
exhaust vent / air intake pipe sizes are:
 2-inch PVC thermopla tic pipe, for model CLQS1–050/075
 3-inch PVC thermopla tic pipe, for model CLQS1–100/125
4. All horizontal runs of exhaust vent pipe shall slope upward at least ¼ inch per foot from the
internal connection inside the furnace to the vent termination, beyond the outside wall. This slope
will permit proper drainage of the condensate.
Horizontal runs of air intake pipe shall slope downward at least ¼ inch per foot from the outlet of
the last elbow or last horizontal run, before exiting the wall, to the intake termination beyond the
outside wall. This slope will permit proper drainage of any precipitation that enters the intake
pipe.
5. The exhaust vent pipe shall be supported at every joint (no more than 4-feet between supports) to
prevent pipe blockage due to condensate trapped at a local low point, or sag, in the vent system.
6. The maximum permi ible length of piping (consisting of a combination of straight pipe and a
corresponding number of elbows) permitted is:

All in tallation and ervice mu t be performed by qualified ervice per onnel.
15
Venting Thru Side Wall
Fl e
Terminated
w/Elbow
Fl e
Terminated
w/Tee
Concentric
Vent Side Wall Cap
CLQS1-050T36N 50' 75' 50' 50'
CLQS1-075T42N 50' 75' 50' 50'
CLQS1-100T48N 50' 75' 50' 50'
CLQS1-125T60N 50' 75' 50' 50'
Venting Thru Roof
Fl e
Terminated -
Vertical Pipe
Fl e
Terminated
w/Tee
Concentric
Vent Side Wall Cap
CLQS1-050T36N 75' x 75' x
CLQS1-075T42N 75' x 75' x
CLQS1-100T48N 75' x 75' x
CLQS1-125T60N 75' x 75' x
x = Not Used
TABLE 2
7. When counting pipe elbows, this includes all elbows, or equivalent pipefittings, used inside the
furnace jacket in addition to those used to construct the termination. Each 90° elbow is the
equivalent of 5 feet of pipe length. Furthermore, two (2) 45° elbows can be substituted for one (1)
90° elbow.
Care should be taken to design the shortest possible intake and exhaust systems. Each system
should contain as few elbows as possible to insure the satisfactory operation of the furnace.
However, system length should never be less than 5 ft of pipe with two (2) 90 deg. elbows. This is
separate from the elbows used at the termination and those inside the furnace cabinet.
. Use a saw designed to cut thermoplastic pipe. All cuts should be made at right angles to the pipe
wall. Smooth jagged edges and remove all burrs and strings. All pipe joint mu t utilize
tandard PVC Schedule 40 erie , DWV type elbow , coupling , and fitting . Clean all pipe
surfaces at connections using a fine abrasive material or approved PVC cleaner (primer). Secure
all pipe joints using suitable permanent PVC pipe solvent cement. Joints are NOT to be made by
simply gluing raw edges of butted together vent pipe.
Piping joints inside the furnace vestibule should be sealed with silicone caulk, rather than pipe
cement, to allow for disassembly and removal of piping, if necessary, during maintenance.

All in tallation and ervice mu t be performed by qualified ervice per onnel.
16
Seal the vent installation by caulking the gap around the two (2) holes where the thermoplastic
pipes pass through the wall.
NOTICE: U e ilicone caulk to eal the Combu tion Air pipe a it pa e through the 2”
Intake Air Flange.
9. Vent connections shall be checked for leakage with the furnace running. Use a mild soap and
water solution to check for leaks.
10. Vent pipe passing through an unheated space shall be insulated with 1-inch thick, foil-faced
fiberglass insulation, or equivalent, to prevent freezing of condensate within the pipe.
11. No clearance is required from the outer surface of the thermoplastic piping to combustible
materials for fire hazard prevention.
12. Thermo Products does not require screens be installed in the exhaust vent and air intake piping.
However, optional stainless steel screens are available from Thermo Products, under part no.
320226 for 3” vent and 320219 for 2” vent.
NOTICE: The furnace may be vented either through the idewall or the roof. For sidewall
instructions, continue to the following section. For roof venting, refer to Section III G, of this manual

All in tallation and ervice mu t be performed by qualified ervice per onnel.
17
F. SIDEWALL VENTING
NOTICE: If the furnace has an overall equivalent vent length of 50 feet or less, it may use the
sidewall termination described in Section 1. If the vent length is greater than 50 feet, up to the max
length allowed, these units should use the termination described in Section 5 for a sidewall
termination.
1. Vent and combustion air pipes may pass through a maximum wall thickness of 1 inches. The
minimum wall thickness is 2 inches. Referring to Figure 1, the maximum distance from the outer
wall to the center of the elbow is 12 inches.
Figure 1: Proper Direct Vent Termination
NOTICE: If exterior sidewall building materials are subject to degradation from contact with flue
gases or moisture, a minimum 24-inch diameter shield shall be fabricated from stainless steel or
UV-resistant plastic sheet. The protective shield shall be installed around the vent pipe on the
outside wall.
2. The exhaust vent termination elbow shall be installed in accordance with these instructions and
any applicable local codes. Refer to Figures 1 and 2 for typical examples of proper terminations.
a. The exhaust vent termination must be installed in the same atmospheric pressure zone (i.e. on
the same wall) as the air intake termination.
b. The bottom edge of the vent termination elbow must be installed at least 12-inches above the
outlet of intake termination elbow.
c. The horizontal distance between the inlet and exhaust terminations should be minimized, when
possible, and should never exceed 24-inches.

All in tallation and ervice mu t be performed by qualified ervice per onnel.
1
d. The vent and intake systems should utilize the same numbers of elbows and approximately the
same length of straight pipe to reach the outside termination.
Figure 2: Typical Relative Location of Direct Vent Termination When Sidewall Venting
3. Exhaust Vent Terminal Location Clearance Requirements
a. The vent terminal shall be located at least 3-feet above any forced air inlet located within 10-
feet. Refer to Figure 3 for a depiction of the minimum required clearances between vent
terminations and building features according to the National Fuel Gas Code (NFGC).
b. The vent terminal shall be at least 12-inches below, 12-inches horizontally from, or 12-inches
above, any door, window, or gravity air inlet into a building. The bottom of the vent terminal
shall be located at least 12-inches above grade.
c. The vent terminal shall not be located:
 over public walkways or over an area where wetting of surfaces by condensate, or water
vapor, could create a nuisance or hazard,
 near soffit vents, crawl space vents, or other areas where condensate or water vapor could
create a nuisance, hazard, or cause property damage,
 where wetting of components by condensate, or water vapor, could be detrimental to the
operation of pressure regulators, relief valves, or any other equipment.
d. The vent terminal shall be installed a minimum of 14-inches from any obstruction and 3-feet
from an inside corner of an L-shaped structure.