Trane Microphone DX1B040A9H21B User Manual

1 8 - CD2 2 D1 - 8  
Installer’s Guide  
High Efficiency Single Stage Upflow/ Horizontal  
and Downflow/ Horizontal Gas-Fired, Direct Vent  
Condensing Furnaces  
*UX1B040A9H21B  
*UX1B060A9H31B  
*UX1B080A9H31B  
*UX1C100A9H41B  
*UX1D120A9H51B  
*__First letter may be “A” or “T”  
*DX1B040A9H21B  
*DX1B060A9H31B  
*DX1B080A9H31B  
*DX1C100A9H31B  
*DX1D120A9H51B  
ALL phases of this installation must comply with NATIONAL, STATE AND LOCAL CODES  
IMPORTANT — This Document is customer property and is to remain with this unit.  
Please return to service information pack upon completion of work.  
*UX1-H  
*DX1-H  
DOWNFLOW  
UPFLOW  
UPFLOW/HORIZONTAL  
DOWNFLOW/HORIZONTAL  
A341624P08  
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Installer’s Guide  
Contents  
Safety signal words are used to designate a degree or level  
of seriousness associated with a particular hazard. The  
signal words for safety markings are WARNING and  
CAUTION.  
INSTALLATION INSTRUCTIONS  
General Installation Instructions  
Location and Clearances  
Outline Drawings  
3
4
a. WARNING indicates a potentially hazardous situation  
which, if not avoided, could result in death or serious  
injury.  
5
Upflow Installation  
7
b. CAUTION indicates a potentially hazardous situation  
which, if not avoided, may result in minor or moderate  
injury. It is also used to alert against unsafe practices  
and hazards involving only property damage.  
Downflow Installation  
Horizontal Installation  
Air For Combustion and Ventilation  
Duct Connections  
7
7
8
10  
11  
14  
15  
15  
16  
20  
20  
22  
22  
25  
27  
27  
29  
31  
Return Air Filters  
General Venting Instructions  
Venting Material  
Venting Tables  
!
WARNING  
Horizontal Venting  
FIRE OR EXPLOSION HAZARD  
Venting Through The Wall  
Venting Through The Roof  
Downward Venting  
Failure to follow the safety warnings exactly could re-  
sult in serious injury, death or property damage.  
Improper servicing could result in dangerous opera-  
tion, serious injury, death, or property damage.  
Venting Through a Masonry Chimney  
Condensate Drain Instructions  
Electrical Connections  
Field Wiring Diagrams  
Gas Piping  
GENERAL INSTALLATION INSTRUCTIONS  
The manufacturer assumes no responsibility for equip-  
ment installed in violation of any code or regulation.  
It is recommended that Manual J of the Air Condition-  
ing Contractors Association (ACCA) or A.R.I. 230 be fol-  
lowed in estimating heating requirements. When esti-  
mating heating requirements for installation at alti-  
tudes above 2000 ft., remember the gas input may need  
to be reduced (See High Altitude Installation).  
Material in this shipment has been inspected at  
the factory and released to the transportation  
agency without known damage. Inspect exterior  
of carton for evidence of rough handling in ship-  
ment. Unpack carefully after moving equipment  
to approximate location. If damage to contents is  
found, report the damage immediately to the de-  
livering agency.  
Combustion Input Checks  
Start Up and Adjustment  
33  
Preliminary Inspections  
33  
34  
34  
34  
35  
Lighting Instructions  
Sequence Of Operation  
Control And Safety Switch Adjustments  
Airflow Adjustment  
Conditions Affecting Furnace Operation  
35  
37  
IFC Error Flash Code  
Category IV furnaces operate with positive vent static  
pressure and with a flue loss less than 17 percent.  
These conditions require special venting systems, which  
must be gas tight and water tight. These Category IV  
Direct Vent furnaces are approved for installation in  
Manufactured/Mobile housing when used with  
BAYMFGH100A.  
Codes and local utility requirements governing the  
installation of gas fired equipment, wiring, plumbing,  
and flue connections must be adhered to. In the ab-  
sence of local codes, the installation must conform with  
latest edition of the National Fuel Gas Code ANSI  
Z223.1 • National Installation Code, CAN/CGA B149.1.  
The latest code may be obtained from the American Gas  
Association Laboratories, 400 N. Capitol St. NW,  
Washington D.C. 20001.  
These furnaces have been classified as CATEGORY IV  
furnaces in accordance with latest edition of ANSI  
Z21.47 • CAN/ CGA 2.3 standards.  
18-CD22D1-8  
3
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Installer’s Guide  
LOCATION AND CLEARANCES  
!
CAUTION  
The location of the furnace is normally selected by the ar-  
chitect, the builder, or the installer. However, before the fur-  
nace is moved into place, be sure to consider the following  
requirements:  
1. Is the location selected as near the vent and as cen-  
tralized for heat distribution as practical?  
2. Do all clearances between the furnace and enclosure  
equal or exceed the minimums shown in the Table 1.  
3. Is there sufficient space for servicing the furnace and  
other equipment? A minimum of 24 inches front acces-  
sibility to the furnace must be provided. Any access  
door or panel must permit removal of the largest com-  
ponent.  
To prevent shortening its service life, the furnace  
should not be used as a “Construction Heater” during  
the finishing phases of construction until the require-  
ments listed in item 9, a-g of the safety section of this  
publication have been met. Condensate in the pres-  
ence of chlorides and fluorides from paint, varnish,  
stains, adhesives, cleaning compounds, and cement  
create a corrosive condition which may cause rapid de-  
terioration of the heat exchanger.  
!
CAUTION  
Do NOT install the furnace in a corrosive or contami-  
nated atmosphere.  
4. Are there at least 3 inches of clearance between the fur-  
nace front panel and any closed panel or door provided?  
5. Are the vent pipe and combustion air inlet pipe within  
vent table lengths? Will the pipes remain unobstructed?  
6. Allow sufficient height in supply plenum above or below  
the furnace to provide for cooling coil installation if the  
cooling coil is not installed at the time of this furnace  
installation.  
!
WARNING  
EXPLOSION HAZARD!  
PROPANE GAS IS HEAVIER THAN AIR AND MAY  
COLLECT IN ANY LOW AREAS OR CONFINED  
SPACES. IN ADDITION, ODORANT FADE MAY MAKE  
THE GAS UNDETECTABLE EXCEPT WITH A WARN-  
ING DEVICE. IF THE GAS FURNACE IS INSTALLED  
IN A BASEMENT, AN EXCAVATED AREA OR A  
CONFINED SPACE, IT IS STRONGLY RECOM-  
MENDED TO CONTACT A GAS SUPPLIER TO IN-  
STALL A GAS DETECTING WARNING DEVICE IN  
CASE OF A GAS LEAK.  
7. A furnace shall be installed so electrical components  
are protected from water.  
8. If the furnace is installed in a residential garage, it  
must be installed so that the burners and the ignition  
source are located not less than 18 inches (46 cm)  
above the floor and the furnace must be located or pro-  
tected to avoid physical damage from vehicles.  
NOTE: The manufacturer of your furnace does NOT test  
any detectors and makes no representations regarding  
any brand or type of detector.  
IMPORTANT:  
The furnace must be installed level. The only allowable  
variation would be slightly to the left and/or forward in up-  
flow installations or slightly toward the front in horizontal in-  
stallations. This is necessary for proper condensate drain-  
age.  
4
18-CD22D1-8  
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Installer’s Guide  
18-CD22D1-8  
5
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Installer’s Guide  
6
18-CD22D1-8  
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Installer’s Guide  
UPFLOW INSTALLATION  
2
Standoffs and screws (See Figure 1) are included with  
the cased coils for attachment to the furnace. There are  
clearance alignment holes near the bottom of the coil  
wrapper. Drill screws are used to engage the furnace  
top flanges. The standoff is inserted into the cabinet  
alignment hole. The drill screws are inserted through  
the standoffs then screwed into the furnace flange.  
The coil is always placed downstream of the furnace air-  
flow.  
A (width)  
B (depth)  
FURNACE  
FRONT  
D
C
HORIZONTAL INSTALLATION  
The coil and furnace must be fully supported when used  
in the horizontal position. It is always recommended  
that an auxiliary drain pan be installed under a horizon-  
tally installed evaporator coil or 90% gas furnace. Con-  
nect the auxiliary drain line to a separate drain line (no  
trap is needed in this line).  
DRILL SCREWS (4)  
STANDOFFS (4)  
1
Three brackets (with screws) are included with down-  
flow furnaces for installation to stabilize and secure the  
furnace and TXC cased coil in the horizontal posi-  
tion. See Figure 4.  
CASED  
COIL  
FOR VERTICAL  
INSTALLATIONS:  
IMPORTANT:  
The 2/4TXC cased coil must be placed downstream of the  
furnace. In horizontal installations, the apex of the coil  
may point either toward or away from the furnace. See  
the 2/4TXC coil Installer's Guide for more details.  
SCREWS  
(BOTH SIDES)  
UPFLO  
FURNA  
The cased coil is secured to the furnace and both the  
furnace and the cased coil must be properly supported.  
The brackets mount using the rear screws on the coil  
case and use the screws provided to secure the bracket  
to the furnace. The remaining bracket is placed as close  
to center as possible (horizontally) between the coil case  
front and the furnace bottom channel (for downflow/  
horizontal furnace). Use four of the screws provided to  
secure the bracket. The upflow furnace, converted to  
horizontal, aligns and attaches the TXC coil as in Fig-  
ure 1. However, the coil requires additional support.  
W
CE  
STANDOFFS  
(BOTH SIDES)  
DOWNFLOW INSTALLATIONS  
!
WARNING  
Do NOT install the furnace directly on carpeting, tile or  
other combustible material other than wood flooring.  
For  
vertical  
downflow  
application,  
subbase  
(BAYBASE205) must be used between the furnace and  
combustible flooring. When the downflow furnace is in-  
stalled vertically with a cased coil, a subbase is not re-  
quired.  
3CASED COIL CONNECTION  
BRACKET FOR DOWNFLOW  
FURNACE IN HORIZONTAL  
Required floor opening:  
DOWNFLOW ONLY  
The furnace may be installed in an attic or crawl space  
in the horizontal position by placing the furnace on the  
left side (as viewed from the front in the vertical posi-  
tion). The horizontal furnace installation in an attic  
should be on a service platform large enough to allow  
for proper clearances on all sides and service access to  
the front of the furnace (See Figure 4 & Clearance  
Table). Line contact is only permissible between lines  
formed by intersections of the top and two sides of the  
furnace casing and building joists, studs, or framing.  
SUBBASE CROSS SECTION  
TABLE 1  
FLOOR OPENING PLENUM OPENING  
CABINET  
RETURN  
WIDTH DUCT WIDTH  
"A"  
"B"  
"C"  
"D"  
17-1/2"  
21"  
16-1/4"  
19-3/4"  
23-1/4"  
16-5/8" 20-1/8"  
20-1/8" 20-1/8"  
23-5/8" 20-1/8"  
15-5/8"  
19-1/8"  
22-5/8"  
19-3/8"  
19-3/8"  
19-3/8"  
24-1/2"  
18-CD22D1-8  
7
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Installer’s Guide  
The furnace may be placed horizontally in a crawl space  
on a pad or other noncombustible material which will  
raise the unit for sufficient protection from moisture.  
The furnace must be supported at both ends and the  
middle when installed horizontally.  
Provisions for combustion and ventilation air shall be  
made in accordance with latest edition of Section 5.3,  
Air for Combustion and Ventilation, of the National  
Fuel Gas Code, ANSI Z223.1 — CAN/CGA B149.1 or ap-  
plicable provisions of the local building codes. Special  
conditions created by mechanical exhausting of air and  
fireplaces must be considered to avoid unsatisfactory  
furnace operation.  
4
OUTSIDE AIR IS RECOMMENDED  
The use of indoor air for most applications is acceptable,  
unless there is the presence of corrosive chemicals  
or contamination. Certain types of installation will  
require the use of outside air for combustion.  
The following types of installations will require use of  
OUTDOOR AIR for combustion, due to chemical expo-  
sures:  
UPFLOW/  
HORIZONTAL  
SHOWN  
* Commercial buildings  
* Buildings with indoor pools  
The furnace must also be elevated a minimum of 6  
inches to allow clearance for the condensate drain to  
exit the cabinet in the horizontal position.  
The horizontal furnace may also be suspended from the  
joists using 3/8" all-thread rods with pieces of angle iron  
underneath the furnace to form a hanging rack at both  
ends and the midpoint. The rods need to be of sufficient  
length to allow for proper clearances from combustible  
materials. The angle iron needs to be at least 32" in  
length to allow for access to service panels.  
* Furnaces installed in “confined” laundry rooms  
* Furnaces installed in “confined” hobby or craft rooms  
* Furnaces installed near chemical storage areas.  
Exposure to the following substances in the combustion  
air supply will also require OUTDOOR AIR for combus-  
tion:  
* Permanent wave solutions  
* Chlorinated waxes and cleaners  
* Chlorine based swimming pool chemicals  
* Water softening chemicals  
* Deicing salts or chemicals  
* Carbon Tetrachloride  
5
* Halogen type refrigerants  
50 CU. FT. OR MORE  
PER 1000 BTU/HR. INPUT  
ALL EQUIP. INSTALLED  
* Cleaning solvents (such as perchloroethylene)  
* Printing inks, paint removers, varnish, etc.  
* Hydrochloric acid  
* Cements and glues  
* Antistatic fabric softeners for clothes dryers  
* Masonry acid washing materials  
UNCONFINED  
Furnace locations may be in a “confined space” or an  
“unconfined space”.  
AIR FOR COMBUSTION AND VENTILATION  
If these furnaces are installed in a nondirect vent capac-  
ity then the adequate flow of combustion and ventilat-  
ing air must not be obstructed from reaching the fur-  
nace. Air openings provided for combustion air must be  
kept free of obstructions which restrict the flow of air.  
Airflow restrictions affect the efficiency and safe opera-  
tion of the furnace. Keep this in mind should you  
choose to remodel or change the area which contains  
your furnace. Furnaces must have a free flow of air for  
proper performance.  
Unconfined space is defined in Figure 5. These spaces  
may have adequate air by infiltration to provide air for  
combustion and ventilation. Buildings with tight  
construction (for example, weather stripping, heavily  
insulated, caulked, vapor barrier, etc.), may need addi-  
tional air to be provided as described for confined space.  
Confined spaces are installations with less than 50 cu.  
ft. of space per 1000 BTU/ hr input from all equipment  
installed. Air for combustion and ventilation require-  
ments can be supplied from inside the building as in  
Figure 8 or from the outdoors, as in Figure 9.  
8
18-CD22D1-8  
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Installer’s Guide  
MINIMUM AREA IN SQUARE FEET  
8
6FOR UNCONFINED SPACE INSTALLATIONS  
FURNACE  
WITH 8 FT. CEILING  
MAXIMUM BTUH MINIMUM AREA IN SQUARE FEET  
INPUT RATING  
OF UNCONFINED SPACE  
60,000  
80,000  
100,000  
120,000  
375  
500  
625  
875  
1. All air from inside the building as in Figure 8: The  
confined space shall be provided with two perma-  
nent openings communicating directly with an addi-  
tional room(s) of sufficient volume so that the com-  
bined volume of all spaces meets the criteria for an  
unconfined space. The total input of all gas utiliza-  
tion equipment installed in the combined space  
shall be considered in making this determination.  
Refer to Table 2 for minimum open areas require-  
ments.  
9
7
CONFINED  
SPACE  
2. All air from outdoors as in Figure 9: The confined  
space shall be provided with two permanent open-  
ings, one commencing within 12 inches of the top  
and one commencing within 12 inches of the bot-  
tom of the enclosure. The openings shall communi-  
cate directly, or by ducts, with the outdoors or  
spaces (crawl or attic) that freely communicate with  
the outdoors. Refer to Table 2, for minimum open  
areas requirements.  
TABLE 2  
MINIMUM FREE AREA IN SQUARE INCHES  
EACH OPENING (FURNACE ONLY)  
Furnace  
Air From Outside  
Air  
From  
Inside  
Maximum  
BTUH/INPUT  
Rating  
Vertical  
Horizontal  
Duct  
Duct  
60,000  
80,000  
100,000  
120,000  
100  
100  
100  
120  
15  
20  
25  
30  
30  
40  
50  
60  
18-CD22D1-8  
9
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Installer’s Guide  
DUCT CONNECTIONS  
PREPARATION FOR UPFLOW BOTTOM AND SIDE  
Air duct systems should be installed in accordance with RETURN AIR FILTER INSTALLATION  
standards for air conditioning systems, National Fire  
All return air duct systems should provide for installa-  
tion of return air filters.  
Protection Association Pamphlet No. 90. They should  
be sized in accordance with ACCA Manual D or which-  
ever is applicable.  
1. Determine the appropriate position to set the  
furnace in order to existing supply and return  
ductwork.  
Central furnaces, when used in connection with cooling  
units, shall be installed in parallel or on the upstream  
side of the cooling coil to avoid condensation in the heat  
exchanger. With a parallel flow arrangement, the damp-  
ers or other means used to control flow of air shall be  
adequate to prevent chilled air from entering the fur-  
nace, and if manually operated, must be equipped with  
means to prevent operation of either unit unless the  
damper is in full heat or cool position.  
On any job, flexible connections of nonflammable mate-  
rial may be used for return air and discharge connections  
to prevent transmission of vibration. Though these units  
have been specifically designed for quiet, vibration free  
operation, air ducts can act as sounding boards and could,  
if poorly installed, amplify the slightest vibration to the  
annoyance level.  
When the furnace is located in a utility room adjacent  
to the living area, the system should be carefully de-  
signed with returns to minimize noise transmission  
through the return air grille. Although these furnaces  
are designed with large blowers operating at moderate  
speeds, any blower moving a high volume of air will  
produce audible noise which could be objectionable  
when the unit is located very close to a living area. It is  
often advisable to route the return air ducts under the  
floor or through the attic. Such design permits the in-  
stallation of air return remote from the living area  
(i.e. central hall).  
When the furnace is installed so that the supply ducts  
carry air circulated by the furnace to areas outside the  
space containing the furnace, the return air shall also  
be handled by a duct(s) sealed to the furnace and termi-  
nating outside the space containing the furnace.  
2. The return air filter and rack are shipped in either  
the bottom or side location. Remove the filter and  
filter rack by first turning the two latches on the  
blower door and tilting the door forward to remove.  
Remove the filter by sliding it out of the rack.  
Compress the spring loaded filter rack to disengage  
the retaining pins/screws from the furnace sides  
and slide the filter rack out.  
The filter rails are spring loaded for automatic  
adjustment to allow standard size, locally obtainable  
replacement filters. The filter rack itself slides to  
adjust to the required width needed for bottom or  
side return.  
3. For upflow side return installations, remove the  
insulation around the opening in the blower compart-  
ment.  
4. The side panels of the upflow furnace include  
locating notches that are used as guides for cutting  
an opening for return air, refer to Figure 10 and the  
outline drawing on page 5 for duct connection  
dimensions for various furnaces.  
5. If a 3/4" flange is to be used for attaching the air  
inlet duct, add to cut where indicated by dotted  
lines in Figure 10. Cut corners diagonally and bend  
outward to form flange.  
6. If flanges are not required, and a filter frame is  
installed, cut between locating notches (See Figure  
10).  
7. The bottom panel of the upflow furnace must be  
removed for bottom return air. After removing the  
filter and filter rack, lay the furnace on its back.  
Remove the two 5/16" hex screws securing the front  
of the bottom channel to the cabinet. Rotate the  
channel downward (or remove by lowering the front  
edge of the channel and pulling forward). Slide the  
bottom return air panel out of the cabinet. Rotate  
the front channel to its original position and rein-  
stall the two 5/16” screws.  
RETURN AIR DUCT SYSTEMS  
Where there is no complete return duct system, the re-  
turn connection must be run full size from the furnace  
to a location outside the utility room, basement, attic,  
or crawl space.  
Do Not install return air through the back of the furnace  
cabinet  
Do Not install return air through the side of the furnace  
cabinet on horizontal applications.  
8. The filter retainer is factory supplied for upflow bot-  
tom return. Use the filter retainer on side or bot-  
tom if filter is to be used within the furnace cabinet  
on upflow only installations.  
NOTE:  
Minimum return air temperature is 55° F.  
All return air duct systems should provide for installa-  
tion of return air filters.  
10  
18-CD22D1-8  
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Installer’s Guide  
9. The horizontal installation of the upflow  
furnace requires an external filter section. Do  
NOT use the bottom return filter within the  
furnace. Filter kits are available for horizon-  
tal applications.  
TABLE 3  
MODELS  
NUMBERS  
CABINET  
WIDTH  
FILTER  
QTY & SIZE  
*UX1B040A9H21B  
*UX1B060A9H31B  
*UX1B080A9H31B  
17-1/2"  
1 - 17" X 25" X 1"  
*UX1C100A9H41B  
21"  
1 - 20" X 25" X 1"  
1 - 24" X 25" X 1"  
10. Connect duct work to furnace. See Outline Drawing  
for supply and return duct size and location. Flex-  
ible duct connectors are recommended to connect  
both supply and return air ducts to the furnace. If  
only the front of the furnace is accessible, it is  
recommended that both supply and return air  
plenums are removable.  
*UX1D120A9H51B  
24-1/2"  
*First letter may be "A" or "T"  
**NOTE: For upflow 5 ton airflow models where the airflow  
requirement exceeds 1800 CFM - Modles will require return air  
openings and filters on: (1) both sides, or (2) one side and the  
bottom, or (3) just on the bottom  
NOTE: For upflow 5 ton airflow models where the  
airflow requirement exceeds 1800 CFM - Models will  
require return air openings and filters on: (1) both  
sides, or (2)1 side and the bottom, or (3) just the  
bottom.  
RETURN AIR FILTERS  
TYPICAL UPFLOW RETURN  
AIR FILTER INSTALLATIONS  
furnaces require high velocity type air filters. The  
filters may be installed within the furnace blower  
compartment for UPFLOW furnaces in either a BOT-  
TOM or SIDE (left side or right side) return air inlet.  
Some filters may need to be trimmed for side or bottom  
filter use.  
The furnace and the bottom filter rack installation can  
be seen in Figure 11.  
The furnace filter in the bottom or side configuration  
can be removed by simply turning the two latches on  
the blower door and tilting the door forward.  
OPTIONAL FILTER RACK INSTALLATION FOR BOT-  
TOM RETURN  
UPFLOW FURNACE ONLY  
0
LOCATING  
CUT OUT  
FOR SIDE  
FILTER  
NOTCHES PRO-  
The following checklist should be used when installing  
a bottom return filter on an upflow furnace:  
VIDED FOR SIDE  
RETURN CUTOUT  
a. Remove the filter.  
b. Remove the filter rack.  
c. Remove the bottom panel.  
FRONT  
of Furnace  
e. With the filter removed, the filter rack is com-  
pressed and then inserted into the bottom of the  
furnace. The retaining screw/pin on each side  
inserts into engagement holes at the bottom of  
the furnace cabinet side. See Figure 12.  
SEE OUTLINE DRAWING  
*
q
f. Reinstall the furnace filter in the bottom posi-  
tion by inserting the chamfer end first into the  
filter rack  
w
Filter Rack  
Retaining  
Screw/Pin  
Furnace  
Cabinet  
Side  
Filter  
Rack  
Airflow  
Engagement Hole  
For Filter Rack  
Installation With  
Bottom Return  
BOTTOM FILTER RACK INSTALLATION  
Bottom Panel  
18-CD22D1-8  
11  
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Installer’s Guide  
FILTER RACK INSTALLATION FOR SIDE RETURN AIR  
ON UPFLOW FURNACES (Left or Right)  
Furnace  
Blower  
Deck  
Engagement Hole  
For Filter Rack  
Installation With  
Side Return  
t
BLOWER  
DECK  
The following checklist should be used when installing  
a right or left side return filter on an upflow furnace:  
Furnace  
Cabinet  
Side  
a. Remove the filter.  
b. Remove the filter rack.  
c. Leave the bottom panel in place.  
Filter  
Rack  
Assembly  
Filter Rack  
Retaining  
Screw/Pin  
e
e. Make side cutout by following the directions in  
the “Return Air Duct Connections” section on  
page 10.  
Filter  
Rack  
e. Compress the filter rack and reinstall in the  
side position on the furnace. Confirm that the  
upper retaining pin/screw locks into the engage-  
ment hole in the blower deck and the lower pin/  
screw rests against the side of the bottom panel.  
See Figures 13-16.  
Furnace  
Cabinet  
Side  
y
f. Reinstall the furnace filter in the side position by  
inserting the chamfer end first into the filter  
rack.  
Filter Rack  
Retaining  
Screw/Pin  
Engagement Hole  
For Filter Rack  
Installation With  
Bottom Return  
SIDE  
CUTOUT  
e
RETAINING  
PIN  
(Both Sides)  
Conversion kits for horizontal filters are BAYFLTR203  
for 17 1/2" width cabinets, BAYFLTR204 for 21" width  
cabinets, and BAYFLTR205 for 24" width cabinets.  
These include filters and brackets necessary for hori-  
zontal filters. In addition, optional door kit  
SPRINGS  
BAYFLTR206 is also available. See Figures 17 and 19.  
RETURN AIR FILTERS FOR UPFLOW FURNACE IN  
HORIZONTAL CONFIGURATION  
BOTTOM  
PANEL  
INSTALLED  
FILTER  
RACK  
RAILS  
When the Upflow Furnace is installed in the horizontal  
configuration, the return air filters must be installed  
exterior to the furnace cabinet. Remote filter grilles  
may be used for homeowner convenience or the filters  
may be installed in the duct work upstream of the fur-  
nace. See Figure 17.  
Typical Upflow Left Side Return Filter Rack Installation  
SIDE  
CUTOUT  
r
RETAINING  
PIN  
(Both Sides)  
u
SPRINGS  
BOTTOM  
FILTER  
PANEL  
RACK  
RAILS  
INSTALLED  
Optional door kit  
BAYFLTR206  
Typical Horizontal Filter Installation  
Typical Upflow Right Side Return Filter Rack Installation  
12  
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TYPICAL DOWNFLOW FURNACE RETURN AIR FILTER  
INSTALLATIONS  
ALTERNATE UPFLOW FILTER CLIP/  
BRACKET INSTALLATION - KIT09224  
These furnaces require high velocity type air filters.  
Downflow furnace filters must be located outside the  
furnace cabinet. Typical installations are shown in Fig-  
ure 19. Tables 4, 5 and 6 provide information for instal-  
lation of the filter retaining brackets shipped with  
downflow furnaces.  
1. Determine the location to be used. The furnace  
cabinet has dimples for location of the alternate fur-  
nace clips (Side return only). Pre-drill clearance  
holes with a 3/16" drill. Bottom return holes are  
pre-drilled. See Figure 18.  
2. Install the clips in front and rear of the desired loca-  
tion using the screws provided. The filter clip with  
the leaf spring mounts in the rear of the cabinet.  
TABLE 4  
MODELS  
NUMBERS  
FILTER  
QTY & SIZE  
CABINET  
WIDTH  
*DX1B040A9H21B  
*DX1B060A9H31B  
*DX1B080A9H31B  
17-1/2"  
2 - 14" X 20" X 1"  
i
REAR  
*DX1C100A9H41B  
*DX1D120A9H51B  
21"  
2 - 16" X 20" X 1"  
2 - 16" X 20" X 1"  
24-1/2"  
SIDE  
-OUT  
CUT  
*First letter may be "A" or "T"  
TABLE 5  
LOCATING FILTER RETAINER BRACKETS IN DUCTWORK  
RETURN  
DUCT  
FILTER  
CABINET  
WIDTH  
DIMENSION DIMENSION  
BRACKET  
LOCATION*  
"A"  
"B"  
WIDTH  
ALTERNATE FILTER  
CLIPS LOCATION  
17-1/2"  
21"  
16-1/4"  
19-3/4"  
23-1/4"  
15"  
19-1/2"  
22"  
14"  
14"  
14"  
14-3/8"  
13-1/8"  
13-5/8"  
24-1/2"  
* LOCATION DIMENSION IS FROM END OF DUCT AGAINST THE FURNACE TO THE  
SCREW HOLES FOR THE BRACKET.  
Optional door kit  
BAYFLTR206  
o
Airflow  
DOWNFLOW  
DOWNFLOW/  
HORIZONTAL  
TABLE 6  
MINIMUM CLEARANCE FROM COMBUSTIBLE MATERIALS FOR  
UPFLOW/HORIZONTAL AND DOWNFLOW/ HORIZONTAL FURNACES  
UNIT LOCATION  
VERTICAL  
CLOSET  
HORIZONTAL  
CLOSET  
HORIZONTAL  
ALCOVE / ATTIC  
FURNACE SURFACE  
SIDES  
BACK  
TOP  
0"  
0"  
1"  
3"  
0"  
1"  
3"  
1"  
3"  
0"  
0"  
6"  
1"  
FRONT  
VENT  
18"  
0"  
NOTE: CLEARANCE REQUIRED AT TOP OF PLENUM IS 1"  
18-CD22D1-8  
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Installer’s Guide  
3. Insofar as is practical, close all building doors and  
windows and all doors between the space in which  
the appliances remaining connected to the common  
venting system are located and other spaces of the  
building. Turn on clothes dryers and any appliances  
not connected to the common venting system. Turn  
on any exhaust fans, such as range hoods and bath-  
room exhausts, so they will operate at maximum  
speed. Do not operate a summer exhaust fan, close  
fireplace dampers.  
4. Follow the lighting instructions. Place the appliance  
being inspected in operation. Adjust thermostat so  
appliance will operate continuously.  
5. Test for spillage at the draft hood relief opening af-  
ter 5 minutes of main burner operation. Use the  
flame of a match or candle, or smoke from a ciga-  
rette, cigar, or pipe.  
GENERAL VENTING  
THIS FURNACE MUST BE VENTED TO THE OUT-  
DOORS.  
THESE FURNACES ARE INDUCED DRAFT VENTED  
AND MUST NOT BE CONNECTED TO ANY VENT  
SERVING ANOTHER APPLIANCE. PLEASE NOTE  
THAT THESE FURNACES USE POSITIVE-PRES-  
SURE VENT SYSTEMS.  
Proper venting is essential to obtain maximum effi-  
ciency from a condensing furnace. Proper installation of  
the vent system is necessary to assure drainage of the  
condensate and prevent deterioration of the vent  
system.  
American Gas Association has certified the design of  
condensing furnaces for a minimum of 0" clearance  
from combustible materials with a single wall plastic  
vent pipe.  
The recommended system is assembled from 2", 2-1/2",  
or 3" plastic pipe and fittings (See Table 7, page 12).  
Where the system is routed to the outdoors through an  
existing masonry chimney containing flue products  
from another gas appliance, or where required by local  
codes, then 3" venting of Type 29-4C stainless steel  
must be used in place of PVC material.  
6. After it has been determined that each appliance re-  
maining connected to the common venting system  
properly vents when tested as outlined above, re-  
turn door, windows, exhaust fans, fireplace dampers  
and any other gas-burning appliance to their previ-  
ous conditions of use.  
If improper venting is observed during any of the above  
tests, the remaining common venting system must be  
corrected. Correction of the remaining common vent  
system should be done by referring to the latest edition  
of the National Fuel Gas Code (ANSI Z223.1) • CAN/  
CGA B149.1 Installation Codes or “Exhibit J” of  
ANSI Z21.47 • CAN/CGA-2.3 Standards. The following  
are general steps to be used to correct or resize a re-  
maining vent system when a furnace which may not be  
common vented is removed from the system:  
a. Determine the Btu per hour input of all remain-  
ing appliances attached to the venting system.  
b. Determine the diameter, rise, and lateral of the  
existing venting system, as well as quantity and  
type of bends.  
These furnaces have been classified as CATEGORY IV  
furnaces in accordance with the latest edition of  
ANSI Z21.47 • CAN/CGA-2.3 Standards. Category IV  
furnaces operate with positive vent pressure and with a  
vent gas temperature less than 140° F above the  
dewpoint. These conditions require special venting sys-  
tems, which must be gas tight and water tight.  
NOTE:  
When an existing furnace is removed from a venting  
system serving other gas appliances, the venting sys-  
tem is likely to be too large to properly vent the re-  
maining attached appliances.  
The following steps shall be followed with each appli-  
ance remaining connected to the common venting sys-  
tem placed in operation, while the other appliances re-  
maining connected to the common venting system are  
not in operation.  
c. Use the appropriate tables in the latest edition of  
the National Fuel Gas Code (ANSI Z223.1 •  
CAN/CGA B149.1 Installation Codes or “Exhibit  
J” of ANSI Z21.47 • CAN/CGA-2.3 Standards. “Ex-  
hibit J” includes examples and drawings of typical  
venting systems.  
1. Seal any unused openings in the common venting  
system.  
2. Visually inspect the venting system for proper size  
and horizontal pitch and determine there is no  
blockage or restriction, leakage, corrosion or other  
deficiencies which could cause an unsafe condition.  
IMPORTANT:  
These furnaces may be installed as Direct Vent (sealed combustion) or as Nondirect vent (single pipe). The furnaces are  
shipped DIRECT VENT with sealed combustion.  
For DIRECT VENT APPLICATION: The furnaces must be vented to the exterior of the house and combustion air MUST  
come through the inlet air pipe FROM OUTSIDE AIR.  
For NONDIRECT VENT APPLICATION: The furnace shall be vented to the exterior of the house, but combustion air may  
enter from the surrounding area as long as combustion air requirements are met. (See AIR FOR COMBUSTION AND  
VENTILATION)  
14  
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2. After checking pipe and socket for proper fit, wipe  
socket and pipe with cleaner-primer. Apply a liberal  
coat of primer to inside surface of socket and out-  
side of pipe.  
DO NOT ALLOW PRIMER TO DRY BEFORE AP-  
PLYING CEMENT.  
3. Apply a thin coat of cement evenly in the socket.  
Quickly apply a heavy coat of cement to the pipe  
end and insert pipe into fitting with a slight twisting  
movement until it bottoms out.  
4. Hold the pipe in the fitting for 30 seconds to pre-  
vent tapered socket from pushing the pipe out of  
the fitting.  
5. Wipe all excess cement from the joint with a rag.  
Allow 15 minutes before handling. Cure time varies  
according to fit, temperature and humidity.  
PVC VENT FITTING MATERIAL  
These fittings are available from your Gas Furnace  
Distributors.  
Straight Pipe Sections, Couplings, 45° Elbows, 60° El-  
bows, 90° Elbows, Vent or Sanitary Tee, or other neces-  
sary fittings may be 2", 2½", 3", or 4" diameter. The al-  
lowable materials are shown in Table 7.  
VENT FITTING MATERIAL – PLASTIC  
Gas and liquid tight single wall vent fittings, designed  
for resistance to corrosive flue condensate, MUST be  
used throughout.  
Listed in Table 8 & 9 are 2", 2½", 3", and 4" size fittings  
that meet these requirements. The materials listed are  
various grades of PVC and ABS plastic.  
PIPE JOINTS: All joints must be fastened and sealed to  
prevent escape of combustion products into the build-  
ing.  
TABLE 7  
PLASTIC PIPE DESIGNATIONS  
PVC  
ASTM STANDARD  
PIPE TYPE  
CELLULAR CORE  
DWV PIPE  
ALLOWABLE TEMPERATURE  
MARKING  
ASTM F891  
ASTM D2665  
ASTM D1785  
ASTM D2241  
F891  
D2665  
D1785  
D2241  
*158  
**158  
**158  
**158  
SCH 40, 80, 120  
SDR SERIES  
CPVC  
ABS  
ASTM STANDARD  
PIPE TYPE  
CPVC 41  
ALLOWABLE TEMPERATURE  
MARKING  
ASTM D2846  
ASTM F441  
ASTM F442  
D2846  
F441  
F442  
**212  
**212  
**212  
SCH 40, 80  
SDR SERIES  
ASTM STANDARD  
PIPE TYPE  
SCH 40 DWV  
ALLOWABLE TEMPERATURE  
MARKING  
ASTM D2661  
ASTM F628  
D2661  
F628  
***180  
***180  
SCH 40 DWV CELLULAR CORE  
*
- Allowable temperatures based on classifications covered in ASTM D4396 [Deflection Temps Under Load (264 PSI)]  
** - Allowable temperatures based on classifications covered in ASTM D1784 [Deflection Temps Under Load (264 PSI)]  
*** - Allowable temperatures based on classifications covered in ASTM D3965 [Deflection Temps Under Load (264 PSI)]  
NOTE:  
IMPORTANT:  
It is recommended that the first joints from the furnace  
be connected and sealed with high temperature RTV.  
This will enable the pipes to be removed later without  
cutting.  
Products installed in Canada must use vent systems  
that are certified to the Standard for Type BH Gas Vent-  
ing Systems (ULC S636) for Class II-A venting systems  
(up to 65°C). Components of the vent system must not  
be interchanged with other vent systems or unlisted  
pipe or fittings. Plastic components, specified prim-  
ers, and glues must be from a single system manufac-  
turer and not intermixed with other system  
manufacturer's vent system parts. In addition, the first  
three feet of the vent pipe must be visible for inspec-  
tion.  
Be sure to properly support these joints.  
BONDING OF PVC  
Commercially available solvent cement must be used  
to join the pipe and fittings. Follow instructions on the  
container carefully.  
Procedure for Cementing Joints:  
1. Cut pipe square, remove ragged edges and burrs.  
Chamfer end of pipe, then clean fitting socket and  
pipe joint area of all dirt, grease, moisture or chips.  
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Installer’s Guide  
VENT AND INLET AIR CONNECTIONS  
WHEN THE FACTORY SUPPLIED "OFF-SET" (2X3  
REDUCING COUPLING) IS USED FOR 3" VENT PIPE  
INSTALLATION, MAKE SURE THE MARKING "TOP" IS  
LOCATED ON THE TOP SIDE OF THE PIPE.  
Seal VENT PIPE  
with RTV sealant  
p
a
LABEL  
SAYS  
"TOP"  
Front of Furnace  
Seal INLET AIR PIPE  
with RTV sealant  
NOTE:  
Follow venting instructions carefully when using PVC  
cement.  
STRAIGHT SIDE MUST BE  
ON BOTTOM FOR PROPER  
CONDENSATE DRAINAGE.  
IMPORTANT:  
All joints must be water tight. Flue condensate is some-  
what acidic, and leaks can cause equipment damage.  
2" TO 3" COUPLING  
s
Connection of the pipe and collar of the combustion  
air inlet should just be a friction fit. It is recommended  
that the inlet air joint be sealed with RTV type sealant  
to allow the joint to be separated for possible future ser-  
vice. The inlet and vent pipes must be properly sup-  
ported throughout the entire length.  
Connection of the vent pipe to the vent collar should  
also be accomplished using RTV type sealant. This type  
sealant provides a connection which remains flexible  
and can be separated in the future if service needs re-  
quire the removal of the vent pipe for service or clear-  
ance.  
#CPL00838  
FACTORY SUPPLIED ONLY  
WITH THE FOLLOWING  
MODELS:  
UC120 & DC120  
UX120 & UY120  
UX100 & UY100  
UX080C960  
ALL DX & DY MODLES  
UX3 & DX3  
UH3 & DH3  
NOTE:  
FURNACE  
VENT  
OUTLET  
To ensure proper operation at the vent lengths indi-  
cated, the combustion air inlet and vent terminals  
should be in the same pressure zone. Terminating the  
vent and inlet in different pressure zones will change  
the maximum vent lengths and may cause nuisance  
tripping of the pressure switch(es). The amount of  
change can not be predicted. The selection of the inlet  
and outlet terminal locations are the responsibility of  
the designer/installer. If the installer chooses separate  
pressure zones for the terminals, the combustion air  
inlet termination must be in the higher (more positive)  
pressure zone.  
HORIZONTAL INSTALLATION  
(Upflow/ Horizontal or Downflow/ Horizontal)  
NOTE:  
In horizontal venting when the factory supplied “off-  
set” (2X3 reducing coupling) is used for 3” vent pipe  
installation, make sure the marking “Top” is located on  
the top side of the pipe. The straight side must be on  
bottom for proper condensate drainage. This coupling  
is factory supplied only with the following models:  
*UC120 & *DC120, *UX120 & *UY120 *UX100 & *UY100,  
*UX808C960, and all *DX & *DY models.  
HORIZONTAL VENTING  
NOTE:  
Vent  
termination  
kit  
BAYAIR30AVENTA  
or  
BAYVENT200B may be used instead of the horizontal  
and vertical termination options shown in the follow-  
ing figures.  
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UPFLOW/ HORIZONTAL VENTING TABLE  
TABLE 8  
MAXIMUM VENT LENGTH:  
DIRECT VENT (2 PIPE SYSTEM) -  
MAXIMUM TOTAL EQUIVALENT FEET FOR  
VENT AND INLET AIR PIPES (See Notes)  
NONDIRECT VENT (1 PIPE SYSTEM) -  
MAXIMUM TOTAL EQUIVALENT FEET FOR  
VENT PIPE ONLY (See Notes)  
2" PIPE  
& FITTINGS  
2-1/2" PIPE  
3" PIPE  
4" PIPE  
2" PIPE  
& FITTINGS  
2-1/2" PIPE  
3" PIPE  
4" PIPE  
MODEL  
& FITTINGS & FITTINGS & FITTINGS  
& FITTINGS & FITTINGS & FITTINGS  
*UX1B040A9H21B  
*UX1B060A9H31B  
*UX1B080A9H31B  
60  
60  
50  
80  
80  
80  
40  
40  
100  
100  
100  
100  
100  
130  
130  
130  
130  
130  
50  
80  
80  
80  
40  
40  
80  
80  
80  
80  
80  
130  
130  
130  
130  
130  
50  
40  
*UX1C100A9H41B NOT ALLOWED  
*UX1D120A9H51B NOT ALLOWED  
NOTES: * - First letter may be "A" or "T"  
1. The INLET AIR of one pipe systems require the installation of a 90° elbow (to prevent dust and debris from falling straight into thefurnace) and a 2 foot  
horizontal or vertical straight pipe section connected before or after the elbow.  
2. DO NOT MIX PIPE DIAMETERS IN THE SAME LENGTH OF PIPE OUTSIDE THE FURNACE CABINET (Except adapters at the top of the furnace).  
NOT ALLOWED  
NOT ALLOWED  
If different inlet and vent pipe sizes are used, the vent pipe must adhere to the maximum length limit shown in the table above (See Note 7 below for exception).  
The inlet pipe can be of a larger diameter, but never smaller than the vent pipe.  
3. MAXIMUM PIPE LENGTHS MUST NOT BE EXCEEDED! THE LENGTH SHOWN IS NOT A COMBINED TOTAL, IT IS THE MAXIMUM LENGTH OF EACH  
(Vent or Inlet air pipes in two pipe systems).  
4. One standard radius 90° elbow is equivalent to 12' of 4" pipe; one SHORT radius 90° elbow is equivalent to 10' of 3" pipe and one LONG radius elbow is  
equivalent to 6' of 3" pipe. One SHORT/LONG radius 90° elbow is equivalent to 7½' of 2½" pipe, & 5' of 2" pipe. Two 45° elbows equal one 90°elbow.  
5. The termination tee or bend must be included in the total number of elbows. If the BAYVENT100 termination kit is used, the equivalent length of pipe is 5 feet.  
There is zero equivalent length for the BAYVENT200.  
6. Pipe adapters are field supplied.  
7. 4" pipe may be reduced to 3" for termination with BAYAIR30AVENTA or BAYVENT200 without additional length restriction.  
MAXIMUM VENT LENGTH:  
DIRECT VENT (2 PIPE SYSTEM) -  
MAXIMUM TOTAL EQUIVALENT FEET FOR  
VENT AND INLET AIR PIPES (See Notes)  
NONDIRECT VENT (1 PIPE SYSTEM) -  
MAXIMUM TOTAL EQUIVALENT FEET FOR  
VENT PIPE ONLY (See Notes)  
2" PIPE  
& FITTINGS  
2-1/2" PIPE  
3" PIPE  
4" PIPE  
2" PIPE  
& FITTINGS  
2-1/2" PIPE  
3" PIPE  
4" PIPE  
MODEL  
& FITTINGS & FITTINGS & FITTINGS  
& FITTINGS & FITTINGS & FITTINGS  
*DX1B040A9H21B  
*DX1B060A9H31B  
*DX1B080A9H31B  
60  
50  
45  
80  
80  
80  
80  
15  
100  
100  
100  
100  
60  
130  
130  
130  
130  
130  
50  
80  
80  
80  
80  
25  
80  
80  
80  
80  
70  
130  
130  
130  
130  
130  
50  
40  
*DX1C100A9H41B NOT ALLOWED  
*DX1D120A9H51B NOT ALLOWED  
NOTES: * - First letter may be "A" or "T"  
1. The INLET AIR of one pipe systems require the installation of a 90° elbow (to prevent dust and debris from falling straight into thefurnace) and a 2 foot  
horizontal or vertical straight pipe section connected before or after the elbow.  
2. DO NOT MIX PIPE DIAMETERS IN THE SAME LENGTH OF PIPE OUTSIDE THE FURNACE CABINET (Except adapters at the top of the furnace).  
NOT ALLOWED  
NOT ALLOWED  
If different inlet and vent pipe sizes are used, the vent pipe must adhere to the maximum length limit shown in the table above (See Note 7 below for exception).  
The inlet pipe can be of a larger diameter, but never smaller than the vent pipe.  
3. MAXIMUM PIPE LENGTHS MUST NOT BE EXCEEDED! THE LENGTH SHOWN IS NOT A COMBINED TOTAL, IT IS THE MAXIMUM LENGTH OF EACH  
(Vent or Inlet air pipes in two pipe systems).  
4. One standard radius 90° elbow is equivalent to 12' of 4" pipe; one SHORT radius 90° elbow is equivalent to 10' of 3" pipe and one LONG radius elbow is  
equivalent to 6' of 3" pipe. One SHORT/LONG radius 90° elbow is equivalent to 7½' of 2½" pipe, & 5' of 2" pipe. Two 45° elbows equal one 90°elbow.  
5. The termination tee or bend must be included in the total number of elbows. If the BAYAIR30VENTA termination kit is used, the equivalent length of pipe is 5 feet.  
There is zero equivalent length for the BAYVENT200.  
6. Pipe adapters are field supplied.  
7. 4" pipe may be reduced to 3" for termination with BAYAIR30AVENTA or BAYVENT200 without additional length restriction.  
DOWNFLOW  
FURNACE  
SINGLE PIPE VENTING  
Air Inlet  
d
UPFLOW FURNACE  
A (0-2') or greater  
B (0-2') or greater  
A+B = 2' minimum  
B
Vent only  
to outside  
Air Inlet  
A
A
A = 2' minimum  
Vent only  
to outside  
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f
INSIDE  
CORNER DETAIL  
G
V
H
D
E
V
B
C
I
V
B
B
B
V
V
L
V
M
V
X
F
X
V
V
J
B
K
A
B
V
X
AREA WHERE TERMINAL IS NOT PERMITTED  
VENT TERMINAL  
AIR SUPPLY INLET  
Direct Vent Terminal Clearances  
Canadian Installations  
US Installations  
Clearance above grade, veranda, porch, deck, or  
balcony  
A=  
B=  
12 inches (30 cm)  
12 inches (30 cm)  
6 inches (15 cm) for appliances =/< 10,000 Btuh (3 kw), 12  
inches (30 cm) for appliances > 10,000 Btuh (3 kw) and =/<  
100,000 Btuh (30 kw), 36 inches (91 cm) for appliances >  
100,000 Btuh (30 kw)  
6 inches (15 cm) for appliances =/< 10,000 Btuh (3 kw), 9  
inches (23 cm) for appliances > 10,000 Btuh (3 kw) and =/<  
50,000 Btuh (15 kw), 12 inches (30 cm) for appliances > 50,000  
Btuh (15 kw)  
Clearance to window or door that may be opened  
C=  
D=  
Clearance to permanently closed window  
*
*
Vertical clearance to ventilated soffit located above the  
terminal within a horizontal distance of 2 feet (61 cm)  
from the center line of the terminal  
*
*
E=  
F=  
G=  
Clearance to unventilated soffit  
Clearance to outside corner  
Clearance to inside corner  
*
*
*
*
*
*
Clearance to each side of center line extended above  
meter/regulator assembly  
3 feet (91 cm) with a height 15 feet (4.5 m) above the  
meter/regulator assembly  
H=  
I=  
*
*
Clearance to service regulator vent outlet  
3 feet (91 cm)  
6 inches (15 cm) for appliances =/< 10,000 Btuh (3 kw), 12  
inches (30 cm) for appliances > 10,000 Btuh (3 kw) and =/<  
100,000 Btuh (30 kw), 36 inches (91 cm) for appliances >  
100,000 Btuh (30 kw)  
6 inches (15 cm) for appliances =/< 10,000 Btuh (3 kw), 9  
inches (23 cm) for appliances > 10,000 Btuh (3 kw) and =/<  
50,000 Btuh (15 kw), 12 inches (30 cm) for appliances > 50,000  
Btuh (15 kw)  
Clearance to nonmechanical air supply inlet to building  
or the combustion air inlet to any other appliance  
J=  
K=  
Clearance to a mechanical air supply inlet  
6 feet (1.83m)  
7 feet (2.13 m) †  
`12 inches (30 cm) ‡  
3 feet (91 cm) above if within 10 feet (3m) horizontally  
Clearance above a paved sidewalk or paved driveway  
located on public property  
L=  
*
*
M=  
Clearance under veranda, porch, deck, or balcony  
Notes:  
1. In accordance with the current CSA B149.1 Natural Gas and Propane Installation Code.  
2. In accordance with the current ANSI Z223.1/NFPA 54 National Fuel Gas Code.  
†. A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwelling and serves both dwellings.  
‡. Pemitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.  
*
Clearance in accordance with local installation codes and the requirements of the gas supplier and the manufacturer's Installation Instructions.  
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Installer’s Guide  
Non-Direct Vent Terminal Clearances  
Canadian Installations  
US Installations  
Clearance above grade, veranda, porch, deck, or  
balcony  
A=  
12 inches (30 cm)  
12 inches (30 cm)  
6 inches (15 cm) for appliances =/< 10,000 Btuh (3 kw), 12  
inches (30 cm) for appliances > 10,000 Btuh (3 kw) and =/<  
100,000 Btuh (30 kw), 36 inches (91 cm) for appliances >  
100,000 Btuh (30 kw)  
4 feet (1.2m) below or to the side of opening; 1 foot (0.3m)  
above opening.  
B= Clearance to window or door that may be opened  
C= Clearance to permanently closed window  
*
*
*
Vertical clearance to ventilated soffit located above the  
D= terminal within a horizontal distance of 2 feet (61 cm)  
from the center line of the terminal  
*
E= Clearance to unventilated soffit  
*
*
*
*
*
*
F=  
Clearance to outside corner  
G= Clearance to inside corner  
Clearance to each side of center line extended above  
meter/regulator assembly  
3 feet (91 cm) with a height 15 feet (4.5 m) above the  
meter/regulator assembly  
H=  
*
*
I=  
Clearance to service regulator vent outlet  
3 feet (91 cm)  
6 inches (15 cm) for appliances =/< 10,000 Btuh (3 kw), 12  
inches (30 cm) for appliances > 10,000 Btuh (3 kw) and =/<  
100,000 Btuh (30 kw), 36 inches (91 cm) for appliances >  
100,000 Btuh (30 kw)  
Clearance to nonmechanical air supply inlet to building  
or the combustion air inlet to any other appliance  
4 feet (1.2 m) below or to side of opening; 1 foot (300 m) above  
opening  
J=  
K= Clearance to a mechanical air supply inlet  
6 feet (1.83m)  
7 feet (2.13 m) †  
`12 inches (30 cm) ‡  
3 feet (91 cm) above if within 10 feet (3m) horizontally  
Clearance above a paved sidewalk or paved driveway  
located on public property  
L=  
7 feet (2.13 m)  
*
M= Clearance under veranda, porch, deck, or balcony  
Notes:  
1. In accordance with the current CSA B149.1 Natural Gas and Propane Installation Code.  
2. In accordance with the current ANSI Z223.1/NFPA 54 National Fuel Gas Code.  
†. A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwelling and serves both dwellings.  
‡. Pemitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.  
*
Clearance in accordance with local installation codes and the requirements of the gas supplier and the manufacturer's Installation Instructions.  
g
ELBOW AND TEE MUST BE  
AS CLOSE TOGETHER  
AS POSSIBLE  
POSSIBLE CONFIGURATIONS FOR TWO PIPE VENTING SYSTEMS  
18-CD22D1-8  
19  
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Installer’s Guide  
!
CAUTION  
Shield material to be a minimum of 24 gauge stainless  
or aluminized sheet metal. Minimum dimensions are  
12"x12". Shield must be fastened to both inside and out-  
side of wall. Use screws or anchor type fasteners suited  
to the outside or inside wall surfaces.  
When the vent pipe is exposed to temperatures below  
freezing, i.e., when it passes through unheated spaces,  
etc., the pipe must be insulated with 1/2 inch (22.7 mm)  
thick Armaflex-type insulation or equal. If the space is  
heated sufficiently to prevent freezing, then the insula-  
tion would not be required. If domestic water pipes are  
not protected from freezing then it is assumed the  
space meets the condition of a heated space.  
NONCOMBUSTIBLE MATERIAL WALL  
The hole through the wall must be large enough to maintain  
pitch of vent and properly seal.  
Use cement mortar seal on inside and outside of wall.  
See Figure 29.  
HORIZONTAL VENTING THROUGH WALL  
These furnaces may be installed as direct vent (as  
shipped) or as nondirect vent. Installation must con-  
form to national, state, and local codes.  
The vent & inlet terminals must be located at least 12"  
minimum above normally expected snow accumulation  
level.  
VENTING THROUGH THE ROOF  
When penetrating roof with a 2" PVC vent pipe, a 2"  
electrical conduit flashing may be used for a weather  
tight seal. Lubricate flexible seal on flashing before PVC  
pipe is pushed through the seal. (Field Supplied)  
Avoid areas where staining or condensate drippage may  
be a problem.  
Location of the vent/ wind terminal should be chosen to  
meet the requirements of Figure 24 for either direct or  
non-direct vent applications.  
j
PITCH – Venting through the wall must maintain 1/4"  
per foot pitched upward to insure that condensate  
drains back to the furnace.  
FLUE GAS DEGRADATION – The moisture content  
of the flue gas may have a detrimental effect on some  
building materials. This can be avoided by using the  
roof or chimney venting option. When wall venting is  
used on any surface that can be affected by this mois-  
ture, it is recommended that a corrosion resistant  
shield (24 inches square) be used behind the vent termi-  
nal. This shield can be wood, plastic, sheet metal, etc.  
Also, silicone caulk all cracks, seams and joints within 3  
feet of the vent terminal.  
BAYAIR30AVENTA  
(Sidewall)  
NOTE:  
No vent cap as shown in Figure 33 is the preferred  
method for vertical vent termination in extremely cold  
climates.  
In extreme climate conditions, insulate the exposed  
pipe above the roof line with Armaflex type insulation.  
h
ANCHORS  
(4 req.)  
VENT  
PLATE  
VENT  
3.2"  
12" MINIMUM  
TO OVERHANG  
k
COMBUSTION  
AIR  
SCREWS  
(4 req.)  
VENT  
VENT  
CAP  
MAINTAIN 12" (18" FOR CANADA) MINIMUM  
CLEARANCE ABOVE HIGHEST ANTICIPATED  
SNOW LEVEL OR GRADE WHICHEVER IS GREATER  
BAYVENT200B  
COMBUSTIBLE MATERIAL WALL  
A minimum clearance of 1" to combustible materials  
must be maintained when using single wall stainless  
steel venting. See Figure 28.  
20  
18-CD22D1-8  
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Installer’s Guide  
SUPPORT HORIZONTAL PIPE EVERY 3'  
0" WITH THE FIRST SUPPORT AS CLOSE  
TO THE FURNACE AS POSSIBLE.  
l
;
INDUCED DRAFT BLOWER, HOUSING,  
AND FURNACE MUST NOT SUPPORT  
THE WEIGHT OF THE FLUE PIPE.  
z
NOTE: VENT AND INLET MUST BE SUPPORTED  
AT A MAXIMUM OF 3' INTERVALS  
SEE VENTING TABLE  
STRAPS OR OTHER SUITABLE SUPPORTS  
AT MAXIMUM OF 3'-0" INTERVALS  
USE ONLY  
APPROVED  
TERMINATION  
COMBUSTION  
AIR INLET  
UPWARD PITCH -- 1/4" PER FOOT  
FIRST SUPPORT SHOULD BE AS  
CLOSE TO FURNACE CONNECTION  
AS POSSIBLE.  
OUTSIDE  
WALL  
40" UPFLOW OR  
DOWNFLOW MODELS  
NOTE: ANY FITTINGS PASSING  
THROUGH AN UNHEATED SPACE  
MUST BE INSULATED.  
EE  
COMBUSTION  
AIR  
REDUCING  
COUPLING,  
FIELD SUPPLIED  
IF NEEDED  
STRAP  
(FIELD SUPPLIED)  
RAIN CAP  
VENT  
2", 2-1/2"  
or 3" PIPING  
VENT  
1" + 1/2"  
ELBOW  
(FIELD  
COMBUSTION AIR  
3" PIPING  
SUPPLIED)  
SEAL ALL  
WALL CAVITIES  
BAYAIR30AVENTA  
BAYVENT200B  
18-CD22D1-8  
21  
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Installer’s Guide  
DOWNWARD VENTING  
Furnace may be in vertical  
or horizontal configuration.  
NOTE:  
x
Both venting methods shown in Figure 30 & 31 must  
also have the combustion air inlet installed - meeting  
dimension requirements of Figure 21.  
DOWNWARD VENT  
LENGTH IS LIMITED  
TO A MAXIMUM OF 15  
EQUIVALENT FEET.  
c
40 Inch  
Upflow or  
Downflow  
Furnace  
Slope 1/4" per ft.  
Slope 1/4" per ft.  
6" Min.  
All horizontal pipes must be supported  
at a maximum of 3 foot intervals  
v
NOTES:  
A) Condensate trap for vent pipe must be a minimum  
of 6 inches in height.  
B) Condensate trap for vent and inlet pipe must be  
connected into a condensate drain pump; an open  
or vented drain; or it can be connected to the outlet  
hose of the furnace's condensate trap. Outdoor  
draining of the furnace and coil condensate is per-  
missible if allowed by local codes. Caution should  
be taken to prevent drains from freezing or causing  
slippery conditions that could lead to personal in-  
jury. Excessive draining of condensate may cause  
saturated ground conditions that may result in  
damage to plants.  
MAINTA
(18 IN. F
MINIMU
ABOVE
ANTICIP
LEVEL
24 IN. A
BAYAIR30AVENTA  
CONCENTRIC VENT  
ROOF TOP APPLICATION  
C) The condensate trap should be primed at initial  
start up prior to heating season operation.  
MAINTAIN 12 IN.  
VENT  
b
(18 IN. FOR CANADA)  
MINIMUM CLEARANCE  
ABOVE HIGHEST  
ANTICIPATED SNOW  
LEVEL. MAXIMUM OF  
24 IN. ABOVE ROOF  
VENTING ROUTED THROUGH A MASONRY CHIMNEY  
VENT FITTING MATERIAL – STAINLESS STEEL  
Gas and liquid tight single wall metal vent fitting, de-  
signed for resistance to corrosive flue condensate such  
as Type 29-4C MUST be used throughout.  
These fittings and fitting accessories are to be supplied  
locally.  
REMOVE RIBS  
FROM CAP  
COMBUSTION  
AIR  
ROOF BOOT  
(FIELD SUPPLIED)  
SUPPORT  
(FIELD SUPPLIED)  
DIRECTION OF STAINLESS STEEL FITTING  
All stainless steel fitting must be installed with male  
end towards the furnace.  
ELBOW  
All horizontal stainless steel sections must be posi-  
tioned with the seam on top.  
(FIELD SUPPLIED)  
All long horizontal sections must be supported to pre-  
vent sagging.  
COMBUSTION  
AIR  
VENT  
All pipe joints must be fastened and sealed to prevent  
escape of combustion products into the building.  
CONCENTRIC VENT  
ROOF INSTALLATION  
22  
18-CD22D1-8  
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Installer’s Guide  
INSPECTION. The state or local gas inspector of  
IMPORTANT:  
4.  
the side wall horizontally vented gas fueled equipment  
shall not approve the installation unless, upon inspection,  
the inspector observes carbon monoxide detectors and  
signage installed in accordance with the provisions of 248  
CMR 5.08(2)(a)1 through 4.  
The Commonwealth of Massachusetts requires compliance  
with regulation 248 CMR 4.00 and 5.00 for installation of  
through – the – wall vented gas appliances as follows:  
This appliance requires a special venting system. If  
BAYAIR30AVENTA or BAYVENT200B are used, a copy of  
the installation instructions for the kit shall remain with  
the appliance or equipment at the completion of  
installation. The venting system installation instructions  
can be obtained from the manufacturer by writing to the  
following address:  
For all side wall horizontally vented gas fueled equipment  
installed in every dwelling, building or structure used in  
whole or in part for residential purposes, including those  
owned or operated by the Commonwealth and where the  
side wall exhaust vent termination is less than seven (7)  
feet above finished grade in the area of the venting,  
including but not limited to decks and porches, the  
following requirements shall be satisfied:  
American Standard, Inc.  
1.  
INSTALLATION OF CARBON MONOXIDE  
6200 Troup Highway  
Tyler, TX 75707  
Attention: Manager of Field Operations Excellence  
DETECTORS. At the time of installation of the side wall  
horizontal vented gas fueled equipment, the installing  
plumber or gasfitter shall observe that a hard wired  
carbon monoxide detector with an alarm and battery back-  
up is installed on the floor level where the gas equipment  
is to be installed. In addition, the installing plumber or  
gasfitter shall observe that a battery operated or hard  
wired carbon monoxide detector with an alarm is installed  
on each additional level of the dwelling, building or  
structure served by the side wall horizontal vented gas  
fueled equipment. It shall be the responsibility of the  
property owner to secure the services of qualified licensed  
professionals for the installation of hard wired carbon  
monoxide detectors  
a.  
In the event that the side wall horizontally vented  
gas fueled equipment is installed in a crawl space or an  
attic, the hard wired carbon monoxide detector with alarm  
and battery back-up may be installed on the next adjacent  
floor level.  
b.  
In the event that the requirements of this  
subdivision can not be met at the time of completion of  
installation, the owner shall have a period of thirty (30)  
days to comply with the above requirements; provided,  
however, that during said thirty (30) day period, a battery  
operated carbon monoxide detector with an alarm shall be  
installed.  
2.  
APPROVED CARBON MONOXIDE  
DETECTORS. Each carbon monoxide detector as required  
in accordance with the above provisions shall comply with  
NFPA 720 and be ANSI/UL 2034 listed and IAS certified.  
3.  
SIGNAGE. A metal or plastic identification plate  
shall be permanently mounted to the exterior of the  
building at a minimum height of eight (8) feet above grade  
directly in line with the exhaust vent terminal for the  
horizontally vented gas fueled heating appliance or  
equipment. The sign shall read, in print size no less than  
one-half (1/2) inch in size, “GAS VENT DIRECTLY  
BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS”.  
18-CD22D1-8  
23  
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Installer’s Guide  
SEAL BETWEEN FLANGE, PIPE,  
COUPLING AND METAL PANEL  
WITH HI TEMP RTV SILICONE SEALANT  
,
FLUE PIPE  
COUPLING  
SUPPORT  
FLANGE  
CEILING  
GALVANIZED FIRESTOP SHOULD  
BE FABRICATED WITH 3-7/8" DIA.  
HOLE FOR SUPPORT FLANGE  
(12" x 12" PANEL OR 12" DIA MIN.)  
CLEARANCE ( 0" ACCEPTABLE FOR PVC VENT PIPE )  
( 1" ACCEPTABLE FOR TYPE 29-4C STAINLESS STEEL VENT PIPE )  
m TYPE 29-4C STAINLESS STEEL VENTING -  
USED THROUGH CHIMNEY THAT VENTS  
ANOTHER GAS APPLIANCE  
VENTING THROUGH CEILING  
STAINLESS  
STAINLESSSTEEL  
VENTCAP  
PVC PLASTIC VENTING - ONLY  
THROUGH UNUSED CHIMNEY  
(OPTIONAL)  
EE CAUTION  
.
6 IN. MIN.  
STAINLESSSTEEL  
VENTCAP  
(OPTIONAL)  
SUPPORT THE SINGLE WAL  
STAINLESS STEEL GAS  
VENTING AND CENTER IT IN  
THE CHIMNEY OPENING WIT  
ANGLES AS SHOWN OR  
ANOTHER EQUIVALENT  
MANNER.  
SEE CAUTION  
FLUE PIPE  
6 IN. MIN.  
SUPPORT THE SINGLE  
OUPLING TO SUPPORT  
PE FROM ANGLES  
R OTHER SUITABLE  
UPPORT METHOD  
WALL FLUE PIPE AND  
CENTER IT IN THE  
CHIMNEY OPENING WI  
ANGLES AS SHOWN O  
ANOTHER EQUIVALEN  
MANNER.  
COUPLING  
AS REQUIRED  
FLUE PIPE  
NOTE:  
HORIZONTAL VENTING  
TO VERTICAL VENTING  
!
CAUTION  
Do NOT run vent through chimney for wood burning  
or oil furnaces or incinerators.  
If remaining free area between single wall flue pipe  
and masonry chimney is to be used for another gas  
appliance venting area must be sufficient to vent  
that appliance and that appliance must be con-  
nected to chimney with separate entry openings.  
NOTE:  
HORIZONTAL VENTING  
TO VERTICAL VENTING  
!
CAUTION  
Do NOT run vent through chimney for wood burn-  
ing or oil furnaces or incinerators or any other gas  
appliance.  
IMPORTANT –  
The single wall flue pipe joints must be sealed.  
The 90° elbow connection to vertical pipe must be  
sealed to prevent condensate leakage to base of ma-  
sonry chimney.  
IMPORTANT –  
The single wall flue pipe joints must be sealed.  
The 90° elbow connection to vertical pipe must be  
sealed to prevent condensate leakage to base of ma-  
sonry chimney.  
24  
18-CD22D1-8  
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Installer’s Guide  
Downflow furnace - The furnace is shipped with the  
left side drainage setup. To change the right side drain,  
remove the drain lines from the trap, rotate the trap  
180° so it exits to the right, reconnect the lines, and run  
a 1/2" CPVC pipe from the trap out through the right  
side knockout. Use RTV silicone sealant to connect the  
CPVC pipe to the trap for ease of removing to clean the  
trap.  
CONDENSATE DRAIN INSTRUCTIONS  
!
CAUTION  
IT IS RECOMMENDED THAT A DRAIN PAN BE INSTALLED  
UNDERTHE FURNACETO PREVENT PROPERTY DAMAGE,  
PERSONAL INJURY OR DEATH FROM LEAKING CONDEN-  
SATE.  
VERTICAL APPLICATIONS  
HORIZONTALAPPLICATIONS  
Upflow furnace - The connection tubing for left and  
right side drainage is shipped in the blower compart-  
ment. Install the connection tubing from the trap to the  
side of the unit and trim all excess tubing to avoid  
kinks.  
Upflow and Downflow furnaces - All horizontal appli-  
cations are left side only. It is always recommended that  
the auxiliary drain pan be installed under a horizontally  
installed evaporator and/or 90% gas furnace. Connect the  
auxiliary drain pan to a separate drain line (no trap is  
needed in this line).  
/
@
Left side  
Right side  
UPFLOW (VERTICAL)  
UPFLOW (VERTICAL)  
#
!
Use  
extension  
hose here  
UPFLOW HORIZONTAL  
17" UNITS  
Use Inducer Drain  
hose without  
extension  
UPFLOW HORIZONTAL 21" & 24" UNITS  
(Left side only)  
(Left side only)  
18-CD22D1-8  
25  
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Installer’s Guide  
The trap must be repositioned to the exterior of the  
cabinet. Remove the trap from its present location and  
reposition the trap outside of the unit, through the long  
circular hole, next to the secondary recuperative cell.  
Remove the larger drain line (from the secondary cell)  
and trim to fit between the secondary cell and the new  
trap location. On upflow units, plug the hole in the  
blower deck where the tube went through.  
^
Remove the hose from the induced blower and reposi-  
tion into the other drain tap of the inducer, which is lo-  
cated 90° clockwise around the inducer. Move the cap  
from that drain tap to the unused drain tap. On upflow  
units, plug the hole in the blower deck where the tube  
went through. This tube on downflow units will need to  
be cut to fit between the inducer and the trap. On up-  
flow units, this tube may need to be extended, using the  
tubing shipped with the furnace.  
Cut off curved end of  
Inducer drain hose  
DOWNFLOW (HORIZONTAL)  
Connections must be made to an OPEN/ VENTED  
DRAIN. Outdoor draining of the furnace and coil con-  
densate is permissible if allowed by local codes. Caution  
should be taken to prevent drains from freezing or caus-  
ing slippery conditions that could lead to personal in-  
jury. Excessive draining of condensate may cause satu-  
rated ground conditions that may result in damage to  
plants.  
$
NOTE:  
Use 1/2" or larger PVC or CPVC pipe and fittings as re-  
quired for drain connections (fittings, pipe and solvent  
cement not provided).  
Left  
side  
NOTE:  
A corrosion resistant condensate pump must be used  
if a pump is required for a specific drain system.  
IMPORTANT:  
The condensate drain should be installed with provisions to  
prevent winter freeze-up of the condensate drain line. Fro-  
zen condensate will block drains, resulting in furnace shut-  
down. If the drain line cannot be installed in a conditioned  
space, then UL listed heat tape should be applied as re-  
quired to prevent freezing (per manufacturer’s instructions).  
The heat tape should be rated at 5 or 6 watts per foot at  
120 volts. Self-regulating (preferred) or thermostatically  
controlled heat tape is required.  
DOWNFLOW (VERTICAL)  
%
Evaporator and furnace condensate drain piping may  
be manifolded together. A primary drain vent stack  
must be installed and terminated below the outlet of  
the secondary heat exchanger drain connection to pre-  
vent water from damaging furnace controls if the pri-  
mary drain outlet plugs up. Where the furnace is in-  
stalled above a finished ceiling, the primary drain vent  
stack must be installed such that overflow from the  
vent stack opening will flow into an axillary drain pan  
in order to prevent water damage to the finished ceiling  
below.  
Right  
side  
DOWNFLOW  
(VERTICAL)  
Use CPVC tubing from Trap outlet,  
over burner box to cabinet exit  
26  
18-CD22D1-8  
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Installer’s Guide  
ELECTRICAL CONNECTIONS  
Make wiring connections to the unit as indicated on en-  
closed wiring diagram. As with all gas appliances using  
electrical power, this furnace shall be connected into a  
permanently live electric circuit. It is recommended  
that furnace be provided with a separate “circuit protec-  
tion device” in the electric circuit. The furnace must be  
electrically grounded in accordance with local codes or  
in the absence of local codes with the National Electri-  
cal Code, ANSI/ NFPA 70 or CSA C22.1 Electrical Code,  
if an external electrical source is utilized. The inte-  
grated furnace control is polarity sensitive. The hot  
leg of the 120V power supply must be connected to the  
black power lead as indicated on the wiring diagram.  
Provision for hooking up an electronic air cleaner and  
or humidifier is provided on the integrated control.  
Refer to the SERVICE FACTS literature and unit wir-  
ing diagram attached to furnace diagram attached to  
furnace.  
&
If upflow furnace is installed  
over a finished ceiling, overflow  
from the primary drain vent  
stack must flow into an auxillary  
drain pan to prevent damage to  
the finished ceiling below.  
Primary drain vent stack  
must terminate below  
secondary heat exchanger  
condensate drain outlet.  
TWINNING FURNACES  
These furnaces may be twinned. Twinning requires  
that two furnaces with the same configuration, capacity,  
and airflow must be used. They shall have common re-  
turns with equal pressure drops or ducts with equiva-  
lent lengths and sizes. See Field Wiring Diagrams for  
proper hookup.  
To drain opening  
FIELD WIRING DIAGRAM FOR 1 STAGE FURNACE  
1 STAGE HEATING  
USING A 1 STAGE HEATING THERMOSTAT  
NO COOLING  
FURNACE  
SEE  
NOTE 7  
TWIN  
SEE  
NOTE 6  
TO 115 V 1 PH.,  
60 HZ., POWER  
SUPPLY PER  
B/C  
B/C  
LOCAL CODES  
HUM SEE  
NOTE 5  
EAC SEE  
NOTE 5  
From drawing B341437 Rv 1  
18-CD22D1-8  
27  
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Installer’s Guide  
FIELD WIRING DIAGRAM FOR 1 STAGE FURNACE  
1 STAGE HEATING, 1 STAGE COOLING  
USING A 1 STAGE HEATING, 1 STAGE COOLING THERMOSTAT  
(OUTDOOR SECTION WITHOUT TRANSFORMER)  
FURNACE  
OUTDOOR UNIT  
(NO TRANSFORMER)  
SEE  
NOTE 6  
SEE  
NOTE 8  
B/C  
B/C  
TO 115 V 1 PH.,  
60 HZ., POWER  
SUPPLY PER  
LOCAL CODES  
HUM SEE  
NOTE 5  
EAC SEE  
NOTE 5  
From drawing B340388 Rv 2  
TWINNING CONNECTION DIAGRAM  
FOR TWINNING 1 STAGE FURNACES WITH  
SINGLE WIRE TWINNING FEATURE  
1 STAGE HEATING ONLY THERMOSTAT  
1 STAGE HEAT  
ONLY  
THERMOSTAT  
(WITH FAN SWITCH)  
FURNACE NO. 1  
FURNACE NO. 2  
BLOWER OPERATION OF  
UNIT NO. 2 IS SYNCRONIZED  
WITH UNIT NO. 1 VIA SIGNALS  
FROM TWIN CONNECTION.  
TWIN  
TWIN  
SEE NOTE 4  
ISOLATION RELAY  
(FIELD SUPPLIED)  
SEE NOTE 4  
R1  
R1  
ISOLATION RELAY  
SEE NOTE 4  
SEE NOTE 3  
B/C  
B/C  
B/C  
From Dwg. 21B341422 Rev. 3  
28  
18-CD22D1-8  
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Installer’s Guide  
TWINNING CONNECTION DIAGRAM  
FOR TWINNING 1 STAGE FURNACES WITH  
SINGLE WIRE TWINNING FEATURE  
1 STAGE HEAT / 1 STAGE COOL THERMOSTAT  
1 STAGE  
OUTDOOR UNIT  
(WITH TRANSFORMER)  
HEATING / COOLING  
THERMOSTAT  
FURNACE NO. 1  
FURNACE NO. 2  
BLOWER OPERATION OF  
UNIT NO. 2 IS SYNCRONIZED  
WITH UNIT NO. 1 VIA SIGNALS  
FROM TWIN CONNECTION.  
TWIN  
TWIN  
ISOLATION RELAY  
(FIELD SUPPLIED)  
SEE NOTE 3  
SEE NOTE 4  
OUTDOOR UNIT  
(NO TRANSFORMER)  
R1  
ISOLATION RELAY  
SEE NOTE 4  
R1  
SEE NOTE 5  
B/C  
B/C  
B/C  
ISOLATION RELAY  
(FIELD SUPPLIED)  
SEE NOTE 4  
From Dwg. 21B341423 Rev. 2  
GAS PIPING  
NOTE:  
Maximum pressure to the gas valve for natural gas is  
13.8" W.C. Minimum pressure is 5.0" W.C. Maximum  
pressure to the gas valve for propane is 13.8" W.C.  
Minimum pressure is 11.0" W.C.  
All gas fittings must be checked for leaks using a  
soapy solution before lighting the furnace. DO NOT  
CHECK WITH AN OPEN FLAME!  
The upflow/ horizontal furnace is shipped standard for  
left side installation of gas piping. A knockout is pro-  
vided on the right side for an alternate gas piping ar-  
rangement. See Figure 37.  
The installation of piping shall be in accordance with  
piping codes and the regulations of the local gas com-  
pany. Pipe joint compound must be resistant to the  
chemical reaction with liquefied petroleum gases.  
Refer to piping Table 10, for delivery sizes. Connect gas  
supply to the unit, using a ground joint union and a  
manual shut-off valve as shown in Figures 37-39.  
National codes require a condensation drip leg to be in-  
stalled ahead of the controls as shown in Figures 37-39.  
The furnace and its individual shut-off valve must be  
disconnected from the gas supply piping system during  
any pressure testing of that system at test pressures in  
excess of 1/2 psig (3.5 kPa).  
The furnace must be isolated from the gas supply piping  
by closing its individual manual shut-off valve during  
any pressure testing of the gas supply piping system at  
test pressures equal to or less than 1/2 psig (3.5 kPa).  
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*
AUTOMATIC GAS VALVE  
WITH MANUAL SHUTOFF  
AUTOMATIC GAS VALVE  
WITH MANUAL SHUTOFF  
MAIN MANUAL  
SHUTOFF VALVE  
MAIN MANUAL  
SHUTOFF VALVE  
GROUND  
UNION  
JOINT  
GROUND  
UNION  
JOINT  
DRIP  
LEG  
DRIP  
LEG  
UPFLOW – LEFT HAND GAS PIPING  
UPFLOW – RIGHT HAND GAS PIPING  
(
THE DOWNFLOW (VERTICAL) MAY BE INSTALLED LEFT OR RIGHT SIDE GAS PIPING  
MAIN MANUAL  
SHUTOFF VALVE  
)
AUTOMATIC GAS VALVE  
WITH MANUAL SHUTOFF  
GROUND UNION JOINT  
DRIP  
LEG  
MAIN MANUAL  
SHUTOFF VALVE  
DRIP  
LEG  
GROUND  
UNION JOINT  
AUTOMATIC GAS VALVE  
WITH MANUAL SHUTOFF  
HORIZONTAL FURNACE GAS PIPING MAY BE FROM EITHER SIDE (UPFLOW SHOWN)  
30  
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b.Attach a manifold pressure gauge to the outlet  
pressure tap marked "OUT PRESS TAP" on  
White-Rodgers gas valve model 36F or boss  
marked "OUT P" on White-Rodgers gas valve  
model 36G. (See Figure 53 for White-Rodgers gas  
valve model 36F and Figure 54 for White-Rodgers  
gas valve model 36G.). For the gas valve model  
36F, measurement requires removal of the plug  
and installation of a barbed fitting. Attach flexible  
tubing and a manometer to the barbed fitting.  
For the gas valve model 36G, do not remove the  
pressure tap test screw. Using a 3/32" hex  
wrench, loosen the pressure tap test screw one  
turn and install 5/16" flexible tubing and a ma-  
nometer directly onto the outlet pressure boss.  
c. Turn on system power and energize valve.  
d.Remove the regulator adjustment screw cap on  
the gas valve for manifold pressure adjustment.  
e.Turn the adjustment nut clockwise to increase  
the gas flow rate, and counterclockwise to de-  
crease the gas flow rate using a 3/32" hex wench.  
f. The final manifold pressure setting shall be as  
specified in Table 12 with an input of no more  
than nameplate rating and no less than 93% of  
the nameplate rating, unless the unit is derated  
for high altitude.  
!
CAUTION  
Use a backup wrench on the gas valve when installing  
gas piping to prevent damage to the gas valve and  
manifold assembly.  
TABLE 10  
NATURAL GAS ONLY  
TABLE OF CUBIC FEET PER HOUR OF GAS  
FOR VARIOUS PIPE SIZES AND LENGTHS  
LENGTH OF PIPE  
PIPE  
SIZE  
10  
132  
278  
520  
1050  
20  
30  
40  
50  
60  
50  
70  
46  
1/2  
3/4  
1
92  
73  
63  
56  
190  
350  
730  
152  
285  
590  
130  
245  
520  
115  
215  
440  
105  
195  
400  
96  
180  
370  
1-1/4  
This table is based on pressure drop of 0.3 inch W.C. and 0.6 SP.GR. gas  
TABLE 11  
ORIFICE SIZES  
MAIN BURNER ORIFICE  
DRILL SIZE  
INPUT  
RATING  
BTUH  
NUMBER  
OF  
BURNERS  
NAT. GAS  
LP GAS  
40,000  
60,000  
80,000  
100,000  
120,000  
2
3
4
5
6
45  
45  
45  
45  
45  
56  
56  
56  
56  
56  
g.Replace the regulator adjustment screw cap and  
tighten securely.  
h.Turn off all electrical power to the system.  
i. Remove the manometer and flexible tubing. Re-  
move the barbed fitting and replace the plug or  
tighten the pressure test screw.  
j. Turn on electrical power to the system and ener-  
gize valve.  
k.Using a leak detection solution or soap suds,  
check for leaks at plug or pressure boss screw.  
COMBUSTION AND INPUT CHECK  
1. Make sure all gas appliances are off except the fur-  
nace.  
2. Clock the gas meter with the furnace operating (de-  
termine the dial rating of the meter) for one revolu-  
tion.  
3. Match the “Sec” column in the gas flow (in cfh)  
Table 13 with the time clocked.  
4. Read the “Flow” column opposite the number of sec-  
onds clocked.  
5. Use the following factors if necessary:  
For 1 Cu. Ft. Dial Gas Flow CFH =  
Chart Flow Reading ÷2  
For 1/2 Cu Ft. Dial Gas Flow CFH =  
Chart Flow Reading ÷4  
For 5 Cu. Ft. Dial Gas Flow CFH =  
10X Chart Flow Reading ÷4  
6. Multiply the final figure by the heating value of the  
gas obtained from the utility company and compare  
to the nameplate rating. This must not exceed the  
nameplate rating.  
7. Changes can be made by adjusting the manifold  
pressure or changing orifices (orifice change may  
not always be required). To adjust the manifold  
pressure:  
a. Turn off all electrical power to the system.  
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Q
!
CAUTION  
Input rate changes can be made by adjusting the mani-  
fold pressure (min 3.0 - max 3.7 in. W.C. - Natural Gas)  
or changing orifices (orifice change may not always be  
required). If the desired input rate can not be achieved  
with a change in manifold pressure, then the orifices  
must be changed. LP installations will require an orifice  
change.  
Replace and/ or tighten all plugs removed or loosened  
when adjusting gas pressure. Leak check the fittings  
before placing the furnace into regular service.  
Failure to follow this warning could result in fire, ex-  
plosion, or property damage.  
NOTE:  
Installation of this furnace at altitudes above 2,000 ft.  
(610m) shall be in accordance with local codes, or in the  
absence of local codes, the National Fuel Gas Code,  
The manifold pressure must be referenced to the  
burner box. The burner box pressure tap equalizes the  
gas valve pressure regulator. Manifold pressure is  
checked by installing a tee (field supplied) in the tub-  
ing, between the tee coming from the burner box tube  
and the gas valve, in addition to the regular gas valve  
pressure tap on the outlet side of the gas valve. See  
Figure 51.  
TABLE 13  
GAS FLOW IN CUBIC FEET PER HOUR  
2 CUBIC FOOT DIAL  
SEC. FLOW SEC. FLOW SEC. FLOW SEC. FLOW  
8
9
900  
800  
720  
655  
600  
555  
514  
480  
450  
424  
400  
379  
360  
343  
327  
313  
300  
288  
277  
267  
257  
29  
30  
31  
32  
33  
34  
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
45  
46  
47  
48  
49  
248  
240  
232  
225  
218  
212  
206  
200  
195  
189  
185  
180  
176  
172  
167  
164  
160  
157  
153  
150  
147  
50  
51  
52  
53  
54  
55  
56  
57  
58  
59  
60  
62  
64  
66  
68  
70  
72  
74  
76  
78  
80  
144  
141  
138  
136  
133  
131  
129  
126  
124  
122  
120  
116  
112  
109  
106  
103  
100  
97  
82  
84  
86  
88  
90  
92  
94  
96  
98  
100  
104  
108  
112  
116  
120  
124  
128  
132  
136  
140  
144  
88  
86  
84  
82  
80  
78  
76  
75  
73  
72  
69  
67  
64  
62  
60  
58  
56  
54  
53  
51  
50  
!
CAUTION  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
Replace manifold pressure tap threaded plug and leak  
check after checking/ adjusting manifold gas pressure.  
Table 11 lists the main burner orifices used with the fur-  
nace. If a change of orifices is required to correct the  
furnace input rating refer to Table 14.  
TABLE 12  
FINAL MANIFOLD PRESSURE SETTINGS  
FUEL  
PRESSURE  
NATURAL GAS  
3.5" W.C.  
LP GAS  
11.0" W.C.  
HIGH ALTITUDE DERATE  
Input ratings (BTUH) of these furnaces are based on  
sea level operation and should not be changed at eleva-  
tions up to 2,000 ft.  
95  
92  
90  
If the installation is 2,000 ft. or above, the furnace input  
rate (BTUH) shall be reduced 4% for each 1,000 ft.  
above sea level. The furnace input rate shall be checked  
by clocking the gas flow rate (CFH) and multiplying by  
the heating value obtained from the local utility sup-  
plier for the gas being delivered at the installed altitude.  
32  
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TABLE 15  
ROTATE THE FRONT  
COVER AS SHOWN  
W
Orifice  
Twist Drill  
Size If  
ALTITUDE ABOVE SEA LEVEL  
INSERT THE TOP  
FLANGE OF THE  
FRONT COVER  
UNDER THE LIP  
INSIDE THE BOX  
and Orifice Required At Other Elevations  
Installed  
At Sea  
Level  
2000 3000 4000 5000 6000 7000 8000 9000 10000  
42  
43  
44  
45  
46  
47  
42 43 43 43 44 44 45 46  
44 44 44 45 45 46 47 47  
45 45 45 46 47 47 48 48  
46 47 47 47 48 48 49 49  
47 47 47 48 48 49 49 50  
47  
48  
50  
50  
51  
52  
ALL SIDE FLANGES  
MUST BE OUTSIDE  
OF THE BOX  
48 48 49 49 49 50 50  
51  
ROTATE THE FRONT  
COVER INWARD  
MAKING SURE THAT  
ALL SIDE FLANGES  
ARE OUTSIDE OF THE  
BOX.  
54  
55  
56  
57  
58  
54 55 55 55 55 55 56 56  
55 55 55 56 56 56 56 56  
56 56 57 57 57 58 59 59  
56  
57  
60  
63  
64  
58 59 59 60 60  
61 62 63  
59 60 60 61 62 62 63 63  
From National Fuel Gas Code - Table F-4  
!
WARNING  
CARBON MONOXIDE POISONING HAZARD  
Failure to follow the installation instructions for the  
venting system being placed into operation could re-  
sult in carbon monoxide poisoning or death.  
ANSI Z223.1/ NFPA 54 or National Standard of  
Canada, Natural Gas and Propane Installation Code,  
CSA B149.1. Installation of this furnace at altitudes  
above 2,000 ft. (610m) shall be made in accordance with  
the listed high Altitude Conversion Kit available with  
this furnace.  
START UP AND ADJUSTMENT  
PRELIMINARY INSPECTIONS  
With gas and electrical power “OFF”  
1. Duct connections are properly sealed  
2. Filters are in place  
IMPORTANT:  
Re-install the propane orifices to the same depth as the  
orifices supplied with the equipment.  
3. Venting is properly assembled  
4. Blower door is in place  
See Table 15 for help in selecting orifices if orifice  
change is required. Furnace input rate and tempera-  
ture rise should be checked again after changing ori-  
fices to confirm the proper rate for the altitude.  
Installations above 4,000 feet may require a pressure  
switch change. If required, use the BAYHALT*** Kit  
(High Altitude Accessory Kit) listed in PRODUCT DATA.  
Flip the switch on main gas valve within the unit to the  
OFF” position. Turn the external gas valve to “ON”.  
Purge the air from the gas lines. After purging, Check  
all gas connections for leaks with a soapy solution —  
DO NOT CHECK WITH AN OPEN FLAME. Allow 5 min-  
utes for any gas that might have escaped to dissipate.  
LP Gas being heavier than air may require forced venti-  
lation. Flip the switch on the gas valve in the unit to  
the “ON” position.  
TABLE 14  
PART NUMBERS FOR REPLACEMENT ORIFICES  
DRILL  
SIZE  
PART  
NUMBER  
DRILL  
SIZE  
PART  
NUMBER  
44  
45  
46  
47  
48  
49  
50  
ORF00501  
ORF00644  
ORF00909  
ORF00910  
ORF01099  
ORF00503  
ORF00493  
54  
55  
56  
57  
58  
59  
ORF00555  
ORF00693  
ORF00907  
ORF00908  
ORF01338  
ORF01339  
Regulator  
Adjustment  
E
Outlet Pressure Boss  
REINSTALLATION OF THE BURNER BOX COVER  
Figure 52 shows the correct way to reinstall the burner  
box cover if adjustment or replacement of the flame  
sensor, hot surface igniter, or main burner orifices have  
required removal of the cover.  
Inlet Pressure  
Boss (opt.)  
On/Off Switch  
White-Rodgers 36G gas valve  
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SEQUENCE OF OPERATION  
Thermostat call for heat  
R
On/Off Switch  
R and W thermostat contacts close signaling the control  
module to run its self-check routine. After the control  
module has verified that the pressure switch contacts  
are open and the limit switch(es) contacts are closed,  
the draft blower will be energized.  
As the induced draft blower comes up to speed, the  
pressure switch contacts will close and the ignitor warm  
up period will begin. The ignitor will heat for approxi-  
mately 20 seconds, then the gas valve is energized to  
permit gas flow to the burners. The flame sensor con-  
firms that ignition has been achieved.  
After the flame sensor confirms within a 4 second trial  
period that ignition has been achieved, the delay to fan  
ON period begins timing. After approximately 45 sec-  
onds the indoor blower motor will be energized and con-  
tinue to run during the heating cycle.  
When the thermostat is satisfied, R and W thermostat  
contacts open, the gas valve will close, the flames will  
extinguish, and the induced draft blower will be de-en-  
ergized. The indoor blower motor will continue to run  
for the fan off period (Field selectable at 60, 100, 140 or  
180 seconds), then be de-energized by the control mod-  
ule.  
White-Rodgers 36F gas valve  
LIGHTING INSTRUCTIONS  
!
WARNING  
DO NOT attempt to manually light the burner.  
Failure to follow this warning could result in property  
damage, personal injury or death.  
Lighting instructions appear on each unit. Each instal-  
lation must be checked out at the time of initial start up  
to insure proper operation of all components. Check out  
should include putting the unit through one complete  
cycle as outlined below.  
CONTROL AND SAFETY SWITCH ADJUSTMENTS  
LIMIT SWITCH CHECK OUT  
Turn on the main electrical supply and set the thermo-  
stat above the indicated temperature. The ignitor will  
automatically heat, then the gas valve is energized to  
permit the flow of gas to the burners. After ignition and  
flame is established, the flame control module monitors  
the flame and supplies power to the gas valve until the  
thermostat is satisfied.  
The limit switch is a safety device designed to close the  
gas valve should the furnace become overheated. Since  
proper operation of this switch is important to the  
safety of the unit, it must be checked out on initial  
start up by the installer.  
To check for proper operation of the limit switches, set  
the thermostat to a temperature higher than the indi-  
cated temperature to bring on the gas valve. Restrict  
the airflow by blocking the return air (disconnecting the  
indoor blower may trip the inducer limit). When the  
furnace reaches the maximum outlet temperature as  
shown on the rating plate, the burners must shut off. If  
they do not shut off after a reasonable time and over-  
heating is evident, a faulty limit switch is probable and  
the limit switch must be replaced. After checking the  
operation of the limit control, be sure to remove the pa-  
per or cardboard from the return air inlet. Refer to Ser-  
vice Facts for additional instructions.  
To shut off.  
For complete shut-down: Flip the switch on the main  
gas valve to the “OFF” position, (See Figure 53 & 54).  
Disconnect the electrical supply to the unit.  
!
CAUTION  
If this is done during the cold weather months, provi-  
sions must be taken to prevent freeze-up of all water  
pipes and water receptacles.  
Failure to follow this warning could result in property  
damage.  
Whenever your house is to be vacant, arrange to have  
someone inspect your house for proper temperature.  
This is very important during freezing weather. If for  
any reason your furnace should fail to operate damage  
could result, such as frozen water pipes.  
NOTE TO INSTALLER  
Review the following warnings with the owner. Review  
contents of USER’S INFORMATION MANUAL with the  
owner.  
34  
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BURNER BOX TEMPERATURE LIMIT DEVICE  
AIRFLOW ADJUSTMENT  
Check inlet and outlet air temperatures to make sure All models are equipped with a manual reset tempera-  
they are within the ranges specified on the furnace rat- ture limit located on the burner box. In case of exces-  
ing nameplate. If the airflow needs to be increased or sive temperature, the limit will open and cause the cir-  
decreased, see the wiring diagram for information on cuit to open which shuts off all flow of gas.  
changing the speed of the blower motor.  
CONDITIONS AFFECTING FURNACE OPERATION  
1. EXCESSIVE COMBUSTION PRESSURE (WIND IN  
EXCESS OF 40 M.P.H.) VENT OR FLUE BLOCKAGE  
If pressure against induced draft blower outlet be-  
comes excessive, the pressure switch will open and  
shut off the gas valve until acceptable combustion  
pressure is again available.  
!
WARNING  
Disconnect power to the unit before removing the  
blower door.  
Failure to follow this warning could result in property  
damage, personal injury or death.  
This unit is equipped with a blower door switch which  
cuts power to the blower and gas valve causing shut-  
down when the door is removed. Operation with the  
door removed or ajar can permit the escape of danger-  
ous fumes. All panels must be securely closed at all  
times for safe operation of the furnace.  
2. LOSS OF FLAME  
If loss of flame occurs during a heating cycle, or  
flame is not present at the sensor, the flame control  
module will close the gas valve. The flame control  
module will then recycle the ignition sequence,  
then if ignition is not achieved, it will shut off the  
gas valve and lock out the system.  
INDOOR BLOWER TIMING  
Heating: The integrated furnace control module controls  
the indoor blower. The blower start is fixed at 45  
seconds after ignition. The FAN-OFF period is field  
selectable by dip switches at 60, 100, 140, or 180 sec-  
onds. The factory setting is 100 seconds (See wiring  
diagram).  
3. POWER FAILURE  
If there is a power failure during a heating cycle,  
the system will restart the ignition sequence auto-  
matically when power is restored if the thermostat  
still calls for heat.  
4. GAS SUPPLY FAILURE  
Cooling: The fan delay off period is factory set at 0  
seconds. The option for 80 second delay off is field  
selectable (See wiring diagram).  
ROOM AIR THERMOSTAT  
HEAT ANTICIPATOR ADJUSTMENT  
If loss of flame occurs during a heating cycle, the  
system integrated control module will recycle the  
ignition sequence, then if ignition is not achieved,  
the integrated control module will shut off the gas  
valve and lock out the system.  
Set the thermostat heat anticipator according to the  
current flow measured, or the settings found in the  
notes on the furnace wiring diagram (found in the  
SERVICE FACTS or inside the furnace casing).  
INSTRUCTIONS TO THE OWNERS  
In the event that electrical, fuel, or mechanical failures  
occur, the owner should immediately turn the gas sup-  
ply off at the manual gas valve, located in the burner  
compartment. Also turn off electrical power to the fur-  
nace and contact the service agency designated by  
your dealer.  
5. INDUCED DRAFT BLOWER FAILURE  
If pressure is not sensed by the pressure switch, the  
contacts will remain open and not allow the gas  
valve to open, therefore the unit will not start. If  
failure occurs during a running cycle, the pressure  
switch contacts will open and the gas valve will  
close to shut the unit down.  
6. CONDENSATE DRAIN BLOCKAGE  
If the condensate drain is blocked, either by debris,  
improper draining, or by freezing condensate, the  
pressure switch will sense the accumulation of con-  
densate in the furnace drain pan. The pressure  
switch contacts will open and remain open, not al-  
lowing unit operation. The unit will not operate un-  
til the condensate drain has been cleared, and the  
condensate flows freely.  
7. RESET AFTER LOCKOUT  
When the integrated control module has shut the  
system down and gone into lockout, the system  
must be manually reset before the unit will restart.  
To reset, turn the system power off, then on, then  
off and then on again within 30 seconds. This may  
be done at the unit’s power source or at the ther-  
mostat. The system will not reset unless the proce-  
dure off-on-off-on is completed within 30 seconds.  
18-CD22D1-8  
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8. RESET AFTER BURNER BOX LIMIT SHUTDOWN  
If the furnace shuts down, one thing that can be  
checked is the burner box temperature limit switch.  
It is located on the bottom of the burner box. The  
vent and combustion air inlet terminations should  
be checked for blockage. If blockage exists, clear  
the problem and then the reset button may be de-  
pressed. If there is no blockage of the terminations,  
the limit switch must be reset by a qualified  
servicer.  
Carbon monoxide, fire or smoke can cause serious  
bodily injury, death, and/ or property damage.  
A variety of potential sources of carbon monoxide can be  
found in a building or dwelling such as gas-fired clothes  
dryers, gas cooking stoves, water heaters, furnaces and  
fireplaces. The U.S. Consumer Product Safety Commis-  
sion recommends that users of gas-burning appliances  
install carbon monoxide detectors as well as fire and  
smoke detectors per the manufacturers installation in-  
structions to help alert dwelling occupants of the pres-  
ence of fire, smoke or unsafe levels of carbon monoxide.  
These devises should be listed by Underwriters Labora-  
tories, Inc. Standards for Single and Multiple Station  
Carbon Monoxide Alarms, UL 2034 or CSA Interna-  
tional Standard, Residential Carbon Monoxide Alarming  
Devices, CSA 6.19.  
NOTE:  
The manufacturer of your furnace does not test any de-  
tectors and makes no representations regarding any  
brand or type of detector.  
36  
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INTEGRATED FURNACE CONTROL ERROR FLASH CODES  
Flashing Slow ---  
Flashing Fast ---  
Continuous ON ---  
Normal - No call for Heat  
Normal - Call for Heat  
Replace IFC  
Continuous OFF --- Check Power  
2 Flashes ---  
System Lockout (Retries or Recycles exceeded)  
Draft Pressure Error - Possible problems:  
a) Venting problem  
b) Pressure switch problem  
3 Flashes ---  
c) Inducer problem  
4 Flashes ---  
5 Flashes ---  
6 Flashes ---  
7 Flashes ---  
8 Flashes ---  
Open Temperature Limit Circuit  
Flame sensed when no flame should be present  
115 volt AC power reversed, poor grounding or system voltage too low  
Gas valve circuit error  
Low flame sense signal  
Check Ignitor Circuit and Line "N" to 24VAC "Common" voltage (2 volts)  
[possible grounding problem]  
9 Flashes ---  
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Trane  
6200 Troup Highway  
Tyler, TX 75707  
Literature Order Number  
File Number  
18-CD22D1-8  
18-CD22D1-8  
18-CD22D1-7  
05/08  
Supersedes  
Date  
For more information contact  
your local dealer (distributor)  
Since the manufacturer has a policy of continuous product and product data improvement, it reserves the right  
to change design and specifications without notice.  
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