Trane DX1B040A9H21B, DX1B060A9H31B, DX1B080A9H31B, DX1D120A9H51B, DX1C100A9H31B User Manual

18- CD22D1- 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”

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

*DX1B040A9H21B
*DX1B060A9H31B
*DX1B080A9H31B
*DX1C100A9H31B
*DX1D120A9H51B

*DX1-H

DOWNFLOW

UPFLOW

UPFLOW/HORIZONTAL

DOWNFLOW/HORIZONTAL

A341624P08

Installer’s Guide

▲

SAFETY SECTION

The following safety practices and precautions must be
followed during the installation, servicing, and operation
of this furnace.

1. Use only with the type of gas approved for this fur­nace. Refer to the furnace rating plate.

2. Install this furnace only in a location and position as
specified in “Location and Clearances” (page 4), of
these instructions.

3. Provide adequate combustion and ventilation air to
the furnace space as specified in “Air for Combus­tion and Ventilation” (pages 8-9), of these instruc­tions.

4. Combustion products must be discharged outdoors.
Connect this furnace to an approved vent system
only, as specified in the “Venting” section (pages 13-

22), of these instructions.

5. Never test for gas leaks with an open flame. Use a
commercially available soap solution made specifi­cally for the detection of leaks to check all connec­tions, as specified in “Gas Piping” (pages 29-30), of
these instructions.

6. Always install the furnace to operate within the
furnace’s intended temperature-rise range with a
duct system which has an external static pressure
within the allowable range, as specified on the unit
rating plate. Airflow with temperature rise for cfm
versus static is shown in the Service Facts accompa­nying this furnace.

7. When a furnace is installed so that 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 casing and terminating outside the space con­taining the furnace.

8. A gas-fired furnace for installation in a residential
garage must be installed as specified in “Location
and Clearances” section (page 4), of these instruc­tions.

9. The furnace may be used for temporary heating of
buildings or structures under construction only
when the following conditions have been met:
a. The furnace venting system must be complete

and installed per manufacturers instructions.

b. The furnace is controlled only by a room ther-

mostat (no field jumpers).

c. The furnace return air duct must be complete

and sealed to the furnace and clean air filters
are in place.

d. The furnace input rate and temperature rise

must be verified to be within nameplate mark­ing.

e. 100% of the furnace combustion air require­ment must come from outside the structure.
f. The furnace return air temperature range is
between 55 and 80 degrees Fahrenheit.
g. Clean the furnace, duct work, and components
upon substantial completion of the construction pro­cess, and verify furnace operating conditions includ­ing ignition, input rate, temperature rise and vent­ing, according to the manufacturer's instructions.

10. This product must be gas piped by a Licensed
Plumber or Gas Fitter in the Commonwealth of
Massachusetts.

!

WARNING

CARBON MONOXIDE POISONING HAZARD
Failure to follow the steps outlined below for each ap­pliance connected to the venting system being placed
into operation could result in carbon monoxide poi­soning or death.
The following steps shall be followed for each appli­ance connected to the venting system being placed
into operation, while all other appliances connected to
the venting system are not in operation:

1. Seal any unused openings in the venting system.

2. Inspect the venting system for proper size and
horizontal pitch, as required in the National Fuel
Gas Code, ANSI Z223.1/NFPA 54 or the CAN/CGA
B149 Installation Codes and these instructions.
Determine that there is no blockage or restriction,
leakage, corrosion and other deficiencies which
could cause an unsafe condition.

3. As far as practical, close all building doors and
windows and all doors between the space in which
the appliance(s) connected to the venting system
are located and other deficiencies which could
cause an unsafe condition.

4. Close fireplace dampers.

5. Turn on clothes dryers and any appliance not con­nected to the venting system. Turn on any exhaust
fans, such as range hoods and bathroom exhausts,
so they are operating at maximum speed. Do not
operate a summer exhaust fan.

6. Follow the lighting instructions. Place the appli­ance being inspected into operation. Adjust the
thermostat so appliance is operating continuously.

7. If improper venting is observed during any of the
above tests, the venting system must be corrected
in accordance with the National Fuel Gas Code,
ANSI Z221.1/NFPA 54 and/or CAN/CGA B149.1 In­stallation Codes.

8. After it has been determined that each appliance
connected to the venting system properly vents
where tested as outlined above, return doors, win­dows, exhaust fans, fireplace dampers and any
other gas-fired burning appliance to their previous
conditions of use.

© 2008 Trane All Rights Reserved 18-CD22D1-8

Installer’s Guide

▲

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.

a. WARNING indicates a potentially hazardous situation

which, if not avoided, could result in death or serious
injury.

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.

!

WARNING

FIRE OR EXPLOSION HAZARD
Failure to follow the safety warnings exactly could re­sult in serious injury, death or property damage.
Improper servicing could result in dangerous opera­tion, serious injury, death, or property damage.

GENERAL INSTALLATION INSTRUCTIONS

The manufacturer assumes no responsibility for equip­ment installed in violation of any code or regulation.
It is recommended that Manual J of the Air Condition­ing Contractors Association (ACCA) or A.R.I. 230 be fol­lowed in estimating heating requirements. When esti­mating heating requirements for installation at alti­tudes 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 ship­ment. Unpack carefully after moving equipment
to approximate location. If damage to contents is
found, report the damage immediately to the de­livering agency.

Codes and local utility requirements governing the
installation of gas fired equipment, wiring, plumbing,
and flue connections must be adhered to. In the ab­sence 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.
1-800-699-9277 or www.aga.org
These furnaces have been classified as CATEGORY IV
furnaces in accordance with latest edition of ANSI
Z21.47 • CAN/ CGA 2.3 standards.

Contents

INSTALLATION INSTRUCTIONS

General Installation Instructions 3
Location and Clearances 4
Outline Drawings 5
Upflow Installation 7
Downflow Installation 7
Horizontal Installation 7
Air For Combustion and Ventilation 8
Duct Connections 10
Return Air Filters 11
General Venting Instructions 14
Venting Material 15
Venting Tables 15
Horizontal Venting 16
Venting Through The Wall 20
Venting Through The Roof 20
Downward Venting 22
Venting Through a Masonry Chimney 22
Condensate Drain Instructions 25
Electrical Connections 27
Field Wiring Diagrams 27
Gas Piping 29
Combustion Input Checks 31

Start Up and Adjustment 33

Preliminary Inspections 33
Lighting Instructions 34
Sequence Of Operation 34
Control And Safety Switch Adjustments 34
Airflow Adjustment 35

Conditions Affecting Furnace Operation 35

IFC Error Flash Code 37

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.

18-CD22D1-8 3

Installer’s Guide

▲

▲

▲

!

CAUTION

To prevent shortening its service life, the furnace
should not be used as a “Construction Heater” during
the finishing phases of construction until the require­ments listed in item 9, a-g of the safety section of this
publication have been met. Condensate in the pres­ence of chlorides and fluorides from paint, varnish,
stains, adhesives, cleaning compounds, and cement
create a corrosive condition which may cause rapid de­terioration of the heat exchanger.

!

CAUTION

Do NOT install the furnace in a corrosive or contami­nated atmosphere.

!

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 WARN­ING DEVICE. IF THE GAS FURNACE IS INSTALLED
IN A BASEMENT, AN EXCAVATED AREA OR A
CONFINED SPACE, IT IS STRONGLY RECOM­MENDED TO CONTACT A GAS SUPPLIER TO IN­STALL A GAS DETECTING WARNING DEVICE IN
CASE OF A GAS LEAK.

NOTE: The manufacturer of your furnace does NOT test

any detectors and makes no representations regarding
any brand or type of detector.

LOCATION AND CLEARANCES

The location of the furnace is normally selected by the ar­chitect, the builder, or the installer. However, before the fur­nace is moved into place, be sure to consider the following
requirements:

1. Is the location selected as near the vent and as cen­tralized 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 acces­sibility to the furnace must be provided. Any access
door or panel must permit removal of the largest com­ponent.

4. Are there at least 3 inches of clearance between the fur­nace 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.

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 pro­tected to avoid physical damage from vehicles.

I

MPORTANT:

The furnace must be installed level. The only allowable
variation would be slightly to the left and/or forward in up­flow installations or slightly toward the front in horizontal in­stallations. This is necessary for proper condensate drain­age.

4 18-CD22D1-8

Installer’s Guide

From Dwg. 21C341884 Rev. 1

(ALL DIMENSIONS ARE IN INCHES)

*UX1-H OUTLINE DRAWING

18-CD22D1-8 5

Installer’s Guide

From Dwg. 21C341885 Rev. 0

(ALL DIMENSIONS ARE IN INCHES)

*DX1-H DOWNFLOW/ HORIZONTAL OUTLINE DRAWING

6 18-CD22D1-8

UPFLOW INSTALLATION

▲

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

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 air­flow.

1

CASED

UPFLOW

FURNACE

STANDOFFS (4)

COIL

STANDOFFS

(BOTH SIDES)

DRILL SCREWS (4)

FOR VERTICAL

INSTALLATIONS:

SCREWS

(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 in­stalled vertically with a cased coil, a subbase is not re­quired.

Required floor opening:

Installer’s Guide

2345678901234567890123456789012123456789012345

2345678901234567890123456789012123456789012345

2345678901234567890123456789012123456789012345

2345678901234567890123456789012123456789012345

2

2345678901234567890123456789012123456789012345

2345678901234567890123456789012123456789012345

2345678901234567890123456789012123456789012345

2345678901234567890123456789012123456789012345

2345678901234567890123456789012123456789012345

2345678901234567890123456789012123456789012345

FURNACE

2345678901234567890123456789012123456789012345

FRONT

2345678901234567890123456789012123456789012345

2345678901234567890123456789012123456789012345

2345678901234567890123456789012123456789012345

2345678901234567890123456789012123456789012345

2345678901234567890123456789012123456789012345

2345678901234567890123456789012123456789012345

2345678901234567890123456789012123456789012345

2345678901234567890123456789012123456789012345

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 horizon­tally installed evaporator coil or 90% gas furnace. Con­nect the auxiliary drain line to a separate drain line (no
trap is needed in this line).
Three brackets (with screws) are included with down­flow furnaces for installation to stabilize and secure the
furnace and TXC cased coil in the horizontal posi-
tion. See Figure 4.

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.

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 Fig­ure 1. However, the coil requires additional support.

3

CASED COIL CONNECTION

BRACKET FOR DOWNFLOW

FURNACE IN HORIZONTAL

A (width)

B (depth)

D

C

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 posi­tion). The horizontal furnace installation in an attic
should be on a service platform large enough to allow

SUBBASE CROSS SECTION

TABLE 1

CABINET

WIDTH

RETURN

DUCT WIDTH

17-1/2" 16-1/4" 16-5/8" 20-1/8" 15-5/8" 19-3/8"

21" 19-3/4" 20-1/8" 20-1/8" 19-1/8" 19-3/8"

24-1/2" 23-1/4" 23-5/8" 20-1/8" 22-5/8" 19-3/8"

FLOOR OPENING PLENUM OPENING

"A" "B" "C" "D"

18-CD22D1-8 7

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.

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.

4

UPFLOW/
HORIZONTAL
SHOWN

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.

5

50 CU. FT. OR MORE
PER 1000 BTU/HR. INPUT
ALL EQUIP. INSTALLED

UNCONFINED

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 ap­plicable provisions of the local building codes. Special
conditions created by mechanical exhausting of air and
fireplaces must be considered to avoid unsatisfactory
furnace operation.

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 expo­sures:
* Commercial buildings
* Buildings with indoor pools
* 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 combus­tion:
* Permanent wave solutions
* Chlorinated waxes and cleaners
* Chlorine based swimming pool chemicals
* Water softening chemicals
* Deicing salts or chemicals
* Carbon Tetrachloride
* Halogen type refrigerants
* 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

AIR FOR COMBUSTION AND VENTILATION

If these furnaces are installed in a nondirect vent capac­ity then the adequate flow of combustion and ventilat­ing air must not be obstructed from reaching the fur­nace. 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 opera­tion 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.

8 18-CD22D1-8

Furnace locations may be in a “confined space” or an
“unconfined space”.

Unconfined space

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 addi­tional air to be provided as described for confined space.

Confined spaces

ft. of space per 1000 BTU/ hr input from all equipment
installed. Air for combustion and ventilation require­ments can be supplied from inside the building as in
Figure 8 or from the outdoors, as in Figure 9.

is defined in Figure 5. These spaces

are installations with less than 50 cu.

Installer’s Guide

6

MAXIMUM BTUH

MINIMUM AREA IN SQUARE FEET

FOR UNCONFINED SPACE INSTALLATIONS

FURNACE

MINIMUM AREA IN SQUARE FEET

INPUT RATING

60,000

80,000
100,000
120,000

WITH 8 FT. CEILING

OF UNCONFINED SPACE

375
500
625
875

1. All air from inside the building as in Figure 8: The
confined space shall be provided with two perma­nent openings communicating directly with an addi­tional room(s) of sufficient volume so that the com­bined volume of all spaces meets the criteria for an
unconfined space. The total input of all gas utiliza­tion equipment installed in the combined space
shall be considered in making this determination.
Refer to Table 2 for minimum open areas require­ments.

7

CONFINED

SPACE

8

9

2.

All air from outdoors as in Figure 9: The confined
space shall be provided with two permanent open­ings, one commencing within 12 inches of the top
and one commencing within 12 inches of the bot­tom of the enclosure. The openings shall communi­cate 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.

Air

From

Inside

100
100
100
120

TABLE 2

Air From Outside

Vertical

Duct

15
20
25
30

Horizontal

Duct

30
40
50
60

MINIMUM FREE AREA IN SQUARE INCHES

EACH OPENING (FURNACE ONLY)

Furnace

Maximum

BTUH/INPUT

Rating

60,000

80,000
100,000
120,000

18-CD22D1-8 9

Installer’s Guide

DUCT CONNECTIONS

Air duct systems should be installed in accordance with
standards for air conditioning systems, National Fire
Protection Association Pamphlet No. 90. They should
be sized in accordance with ACCA Manual D or which­ever is applicable.
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 damp­ers or other means used to control flow of air shall be
adequate to prevent chilled air from entering the fur­nace, 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 mate­rial 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 de­signed 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 in­stallation 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 termi­nating outside the space containing the furnace.

RETURN AIR DUCT SYSTEMS
Where there is no complete return duct system, the re­turn 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.

NOTE:
Minimum return air temperature is 55° F.

All return air duct systems should provide for installa­tion of return air filters.

PREPARATION FOR UPFLOW BOTTOM AND SIDE
RETURN AIR FILTER INSTALLATION

All return air duct systems should provide for installa­tion of return air filters.

1. Determine the appropriate position to set the
furnace in order to existing supply and return
ductwork.

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 compart­ment.

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 rein­stall the two 5/16” screws.

8. The filter retainer is factory supplied for upflow bot­tom return. Use the filter retainer on side or bot­tom if filter is to be used within the furnace cabinet
on upflow only installations.

10 18-CD22D1-8

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 horizon­tal applications.

10. Connect duct work to furnace. See Outline Drawing
for supply and return duct size and location. Flex­ible 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.

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 BOT­TOM or SIDE (left side or right side) return air inlet.
Some filters may need to be trimmed for side or bottom
filter use.

0

LOCATING
NOTCHES PRO­VIDED FOR SIDE
RETURN CUTOUT

SEE OUTLINE DRAWING

*

UPFLOW FURNACE ONLY

CUT OUT
FOR SIDE
FILTER

FRONT
of Furnace

q

TABLE 3

MODELS

NUMBERS

*UX1B040A9H21B
*UX1B060A9H31B
*UX1B080A9H31B

*UX1C100A9H41B 21" 1 - 20" X 25" X 1"

*UX1D120A9H51B 24-1/2" 1 - 24" X 25" X 1"

*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

CABINET

WIDTH

17-1/2" 1 - 17" X 25" X 1"

FILTER

QTY & SIZE

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.

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 BOT­TOM RETURN

The following checklist should be used when installing
a bottom return filter on an upflow furnace:

a. Remove the filter.

b. Remove the filter rack.

c. Remove the bottom panel.

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.

f. Reinstall the furnace filter in the bottom posi-

tion by inserting the chamfer end first into the
filter rack

w

Filter Rack
Retaining

Furnace

Cabinet

Side

Screw/Pin

Filter
Rack

Airflow

Engagement Hole

For

Filter Rack

BOTTOM FILTER RACK INSTALLATION

18-CD22D1-8 11

Installation With

Bottom Return

Bottom Panel

Installer’s Guide

Airflow

Airflow

FILTER RACK INSTALLATION FOR SIDE RETURN AIR
ON UPFLOW FURNACES (Left or Right)

The following checklist should be used when installing
a right or left side return filter on an upflow furnace:

a. Remove the filter.

b. Remove the filter rack.

c. Leave the bottom panel in place.

e

e. Make side cutout by following the directions in

the “Return Air Duct Connections” section on
page 10.

e. Compress the filter rack and reinstall in the

side position on the furnace. Confirm that the
upper retaining pin/screw locks into the engage­ment hole in the blower deck and the lower pin/
screw rests against the side of the bottom panel.
See Figures 13-16.

f. Reinstall the furnace filter in the side position by

inserting the chamfer end first into the filter
rack.

SIDE

e

CUTOUT

Airflow

RETAINING

PIN

(Both Sides)

SPRINGS

t

BLOWER

Engagement Hole
For

Filter Rack
Installation With
Side

Return

Furnace
Blower
Deck

DECK

Furnace

Cabinet

Side

Filter Rack
Retaining
Screw/Pin

Filter
Rack
Assembly

Filter

Furnace

Rack

Cabinet

Side

y

Filter Rack
Retaining
Screw/Pin

Engagement Hole
For

Filter Rack
Installation With
Bottom Return

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 hori­zontal filters. In addition, optional door kit
BAYFLTR206 is also available. See Figures 17 and 19.

FILTER

RACK
RAILS

BOTTOM

PANEL

INSTALLED

RETURN AIR FILTERS FOR UPFLOW FURNACE IN
HORIZONTAL CONFIGURATION

When the Upflow Furnace is installed in the horizontal
configuration, the return air filters must be installed

Typical Upflow Left Side Return Filter Rack Installation

SIDE

r

Airflow

Typical Upflow Right Side Return Filter Rack Installation

12 18-CD22D1-8

BOTTOM

PANEL

INSTALLED

FILTER

CUTOUT

RETAINING

PIN

(Both Sides)

SPRINGS

RACK
RAILS

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 fur­nace. See Figure 17.

u

Airflow

Optional door kit
BAYFLTR206

Typical Horizontal Filter Installation

Installer’s Guide

ALTERNATE UPFLOW FILTER CLIP/
BRACKET INSTALLATION - KIT09224

1. Determine the location to be used. The furnace
cabinet has dimples for location of the alternate fur­nace 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 loca­tion using the screws provided. The filter clip with
the leaf spring mounts in the rear of the cabinet.

i

SIDE

CUT-OUT

REAR

ALTERNATE FILTER
CLIPS LOCATION

TYPICAL DOWNFLOW FURNACE RETURN AIR FILTER
INSTALLATIONS

These furnaces require high velocity type air filters.
Downflow furnace filters must be located outside the
furnace cabinet. Typical installations are shown in Fig­ure 19. Tables 4, 5 and 6 provide information for instal­lation of the filter retaining brackets shipped with
downflow furnaces.

TABLE 4

MODELS

NUMBERS

CABINET

WIDTH

FILTER

QTY & SIZE

*DX1B040A9H21B
*DX1B060A9H31B

17-1/2" 2 - 14" X 20" X 1"

*DX1B080A9H31B
*DX1C100A9H41B 21" 2 - 16" X 20" X 1"
*DX1D120A9H51B 24-1/2" 2 - 16" X 20" X 1"

*First letter may be "A" or "T"

TABLE 5

LOCATING FILTER RETAINER BRACKETS IN DUCTWORK

CABINET

WIDTH

17-1/2" 16-1/4" 15" 14" 14-3/8"

21" 19-3/4" 19-1/2" 14" 13-1/8"

24-1/2" 23-1/4" 22" 14" 13-5/8"

* LOCATION DIMENSION IS FROM END OF DUCT AGAINST THE FURNACE TO THE
SCREW HOLES FOR THE BRACKET.

RETURN

DUCT

WIDTH

DIMENSION

"A"

DIMENSION

"B"

FILTER

BRACKET

LOCATION*

o

DOWNFLOW

FURNACE SURFACE

SIDES 0" 1" 0"

BACK 0" 3" 6"

TOP 1" 1" 1"

FRONT 3" 3" 18"

VENT 0" 0" 0"

NOTE

: CLEARANCE REQUIRED AT TOP OF PLENUM IS 1"

Optional door kit
BAYFLTR206

Airflow

TABLE 6

MINIMUM CLEARANCE FROM COMBUSTIBLE MATERIALS FOR

UPFLOW/HORIZONTAL AND DOWNFLOW/ HORIZONTAL FURNACES

UNIT LOCATION

VERTICAL

CLOSET

Airflow

HORIZONTAL

CLOSET

DOWNFLOW/
HORIZONTAL

HORIZONTAL

ALCOVE / ATTIC

18-CD22D1-8 13

Installer’s Guide

GENERAL VENTING

THIS FURNACE MUST BE VENTED TO THE OUT­DOORS.
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 effi­ciency 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.
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 sys­tems, 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 sys­tem is likely to be too large to properly vent
maining attached appliances.

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

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)

the re-

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 bath­room 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 af­ter 5 minutes of main burner operation. Use the
flame of a match or candle, or smoke from a ciga­rette, cigar, or pipe.

6. After it has been determined that each appliance re­maining connected to the common venting system
properly vents when tested as outlined above, re­turn door, windows, exhaust fans, fireplace dampers
and any other gas-burning appliance to their previ­ous 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 re­maining 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.

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. “Ex­hibit J” includes examples and drawings of typical
venting systems.

14 18-CD22D1-8

Installer’s Guide

PVC VENT FITTING MATERIAL

These fittings are available from your Gas Furnace
Distributors.

Straight Pipe Sections, Couplings, 45° Elbows, 60° El­bows, 90° Elbows, Vent or Sanitary Tee, or other neces­sary fittings may be 2", 2½", 3", or 4" diameter. The al­lowable 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

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 out­side of pipe.
DO NOT ALLOW PRIMER TO DRY BEFORE AP­PLYING 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 pre­vent 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.

prevent escape of combustion products into the build­ing.

TABLE 7

PLASTIC PIPE DESIGNATIONS

PVC

ASTM STANDARD PIPE TYPE ALLOWABLE TEMPERATURE MARKING

F891 CELLULAR CORE *158 ASTM F891

D2665 DWV PIPE **158 ASTM D2665

D1785 SCH 40, 80, 120 **158 ASTM D1785

D2241 SDR SERIES **158 ASTM D2241

CPVC

ASTM STANDARD PIPE TYPE ALLOWABLE TEMPERATURE MARKING

D2846 CPVC 41 **212 ASTM D2846

F441 SCH 40, 80 **212 ASTM F441

F442 SDR SERIES **212 ASTM F442

ABS

ASTM STANDARD PIPE TYPE ALLOWABLE TEMPERATURE MARKING

D2661 SCH 40 DWV ***180 ASTM D2661

F628 SCH 40 DWV CELLULAR CORE ***180 ASTM F628

* - 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:
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.
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

IMPORTANT:

Products installed in Canada must use vent systems
that are certified to the Standard for Type BH Gas Vent­ing 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 prim­ers, and glues must be from a single system manufac­turer 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 inspec­tion.

pipe joint area of all dirt, grease, moisture or chips.

18-CD22D1-8 15

Installer’s Guide

2" TO 3" COUPLING

FURNACE
VENT
OUTLET

FACTORY SUPPLIED ONLY
WITH THE FOLLOWING
MODELS:
UC120 & DC120
UX120 & UY120
UX100 & UY100
UX080C960
ALL DX & DY MODLES
UX3 & DX3
UH3 & DH3

#CPL00838

VENT AND INLET AIR CONNECTIONS

p

Seal INLET AIR PIPE

with RTV sealant

N

OTE:

Front of Furnace

Seal VENT PIPE
with RTV sealant

Follow venting instructions carefully when using PVC
cement.

IMPORTANT:

All joints must be water tight. Flue condensate is some­what acidic, and leaks can cause equipment damage.

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 ser­vice. The inlet and vent pipes must be properly sup­ported 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 re­quire the removal of the vent pipe for service or clear­ance.

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.

a

LABEL
SAYS
"TOP"

STRAIGHT SIDE MUST BE
ON BOTTOM FOR PROPER
CONDENSATE DRAINAGE.

s

NOTE:
To ensure proper operation at the vent lengths indi­cated, 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 VENTING

NOTE:
Vent termination kit BAYAIR30AVENTA or
BAYVENT200B may be used instead of the horizontal
and vertical termination options shown in the follow­ing figures.

16 18-CD22D1-8

HORIZONTAL INSTALLATION
(Upflow/ Horizontal or Downflow/ Horizontal)

NOTE:
In horizontal venting when the factory supplied “off­set” (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.

Installer’s Guide

Vent only
to outside

Air Inlet

A

A = 2' minimum

DOWNFLOW

FURNACE

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)

MODEL

*UX1B040A9H21B

*UX1B060A9H31B

*UX1B080A9H31B

*UX1C100A9H41B

*UX1D120A9H51B

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).
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.

2" PIPE

& FITTINGS

60 80 100 130 50 80 80 130

60 80 100 130 50 80 80 130

50 80 100 130 40 80 80 130

NOT ALLOWED 40 100 130 NOT ALLOWED 40 80 130

NOT ALLOWED 40 100 130 NOT ALLOWED 40 80 130

2-1/2" PIPE

& FITTINGS

3" PIPE

& FITTINGS

4" PIPE

& FITTINGS

& FITTINGS

MAXIMUM VENT LENGTH:

DIRECT VENT (2 PIPE SYSTEM) -

MAXIMUM TOTAL EQUIVALENT FEET FOR

VENT AND INLET AIR PIPES (See Notes)

MODEL

*DX1B040A9H21B

*DX1B060A9H31B

*DX1B080A9H31B

*DX1C100A9H41B

*DX1D120A9H51B

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).
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.

2" PIPE

& FITTINGS

60 80 100 130 50 80 80 130

50 80 100 130 50 80 80 130

45 80 100 130 40 80 80 130

NOT ALLOWED 80 100 130 NOT ALLOWED 80 80 130

NOT ALLOWED 15 60 130 NOT ALLOWED 25 70 130

2-1/2" PIPE

& FITTINGS

3" PIPE

& FITTINGS

4" PIPE

& FITTINGS

& FITTINGS

NONDIRECT VENT (1 PIPE SYSTEM) -

MAXIMUM TOTAL EQUIVALENT FEET FOR

VENT PIPE ONLY (See Notes)

2" PIPE

MAXIMUM TOTAL EQUIVALENT FEET FOR

2" PIPE

2-1/2" PIPE

& FITTINGS

NONDIRECT VENT (1 PIPE SYSTEM) -

VENT PIPE ONLY (See Notes)

2-1/2" PIPE

& FITTINGS

3" PIPE

& FITTINGS

3" PIPE

& FITTINGS

4" PIPE

& FITTINGS

4" PIPE

& FITTINGS

d

SINGLE PIPE VENTING

UPFLOW FURNACE

B

Air Inlet

A

18-CD22D1-8 17

A (0-2') or greater
B (0-2') or greater
A+B = 2' minimum

Vent only
to outside

Installer’s Guide

f

INSIDE

CORNER DETAIL

G

V

D

EE

V

FIXED

CLOSED

J

B

V

X

V

B

L

V

VENT TERMINAL

Clearance above grade, veranda, porch, deck, or

A=

balcony

B= Clearance to window or door that may be opened

C= Clearance to per manently 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

H=

meter/regulator assembly

I= Clearance to service regulator vent outlet 3 feet (91 cm) *

Clearance to nonmechanical air supply inlet to building

J=

or the combustion air inlet to any other appliance

K= Clearance to a mechanical air supply inlet 6 feet (1.83m) 3 feet (91 cm) above if within 10 feet (3m) horizontally

Clearance above a paved sidewalk or paved driveway

L=

located on public property

M= Clearance under veranda, porch, deck, or balcony `12 inches (30 cm) ‡ *

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.

C

FIXED

V

CLOSED

OPERABLE

V

F

B

X

AIR SUPPLY INLET

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), 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)

B

OPERABLE

V

B

Direct Vent Terminal Clearances

3 feet (91 cm) with a height 15 feet (4.5 m) above the

meter/regulator assembly

V

B

A

AREA WHERE TERMINAL IS NOT PERMITTED

Canadian Installations US Installations

12 inches (30 cm) 12 inches (30 cm)

**

7 feet (2.13 m) † *

H

I

M

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)

*

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)

X

V

K

18 18-CD22D1-8

Installer’s Guide

Non-Direct Vent Terminal Clearances

Canadian Installations US Installations

Clearance above grade, veranda, porch, deck, or

A=

balcony

6 inches (15 cm) for appliances =/< 10,000 Btuh (3 kw), 12

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

H=

meter/regulator assembly

I= Clearance to service regulator vent outlet 3 feet (91 cm) *

Clearance to nonmechanical air supply inlet to building

J=

or the combustion air inlet to any other appliance

K= Clearance to a mechanical air supply inlet 6 feet (1.83m) 3 feet (91 cm) above if within 10 feet (3m) horizontally

Clearance above a paved sidewalk or paved driveway

L=

located on public property

M= Clearance under veranda, porch, deck, or balcony `12 inches (30 cm) ‡ *

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, po rch, 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.

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)

3 feet (91 cm) with a height 15 feet (4.5 m) above the

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)

12 inches (30 cm) 12 inches (30 cm)

4 feet (1.2m) below or to the side of opening; 1 foot (0.3m)

above opening.

**

meter/regulator assembly

4 feet (1.2 m) below or to side of opening; 1 foot (300 m) above

opening

7 feet (2.13 m) † 7 feet (2.13 m)

*

g

ELBOW AND TEE MUST BE
AS CLOSE TOGETHER
AS POSSIBLE

POSSIBLE CONFIGURATIONS FOR TWO PIPE VENTING SYSTEMS

18-CD22D1-8 19

Installer’s Guide

▲

!

CAUTION

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 insula­tion 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.

HORIZONTAL VENTING THROUGH WALL
These furnaces may be installed as direct vent (as
shipped) or as nondirect vent. Installation must con­form to national, state, and local codes.

The vent & inlet terminals must be located at least 12"
minimum above normally expected snow accumulation
level.
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.
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 mois­ture, it is recommended that a corrosion resistant
shield (24 inches square) be used behind the vent termi­nal. This shield can be wood, plastic, sheet metal, etc.
Also, silicone caulk all cracks, seams and joints within 3
feet of the vent terminal.

h

ANCHORS
(4 req.)

7.2"

3.2"

COMBUSTION
AIR

VENT

VENT
PLATE

12" MINIMUM
TO OVERHANG

SCREWS
(4 req.)

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 out­side of wall. Use screws or anchor type fasteners suited
to the outside or inside wall surfaces.

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.

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)

j

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.

k

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

Installer’s Guide

4

N

l

z

SEE VENTING TABLE

STRAPS OR OTHER SUITABLE SUPPORTS
AT MAXIMUM OF 3'-0" INTERVALS

;

USE ONLY

APPROVED

TERMINATIO

SUPPORT HORIZONTAL PIPE EVERY 3'
0" WITH THE FIRST SUPPORT AS CLOSE
TO THE FURNACE AS POSSIBLE.
INDUCED DRAFT BLOWER, HOUSING,
AND FURNACE MUST NOT SUPPORT
THE WEIGHT OF THE FLUE PIPE.

NOTE: VENT AND INLET MUST BE SUPPORTED

AT A MAXIMUM OF 3' INTERVALS

COMBUSTION
AIR INLET

UPWARD PITCH -- 1/4" PER FOOT

FIRST SUPPORT SHOULD BE AS

0" UPFLOW OR

DOWNFLOW MODELS

CLOSE TO FURNACE CONNECTION
AS POSSIBLE.

NOTE: ANY FITTINGS PASSING
THROUGH AN UNHEATED SPACE
MUST BE INSULATED.

OUTSIDE

WALL

TEE

COMBUSTION

STRAP
(FIELD SUPPLIED)

VENT

COMBUSTION AIR

ELBOW
(FIELD
SUPPLIED)

BAYAIR30AVENTA

AIR

1" + 1/2"

RAIN CAP

VENT

2", 2-1/2"

or 3" PIPING

BAYVENT200B

REDUCING
COUPLING,
FIELD SUPPLIED
IF NEEDED

3" PIPING

WALL CAVITIES

SEAL ALL

18-CD22D1-8 21

Installer’s Guide

DOWNWARD VENTING

Furnace may be in vertical

x

or horizontal configuration.

DOWNWARD VENT

LENGTH IS LIMITED

TO A MAXIMUM OF 15

EQUIVALENT FEET.

40 Inch
Upflow or
Downflow

Furnace

Slope 1/4" per ft.

Slope 1/4" per ft.

All horizontal pipes must be supported

at a maximum of 3 foot intervals

6" Min.

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 per­missible if allowed by local codes. Caution should
be taken to prevent drains from freezing or causing
slippery conditions that could lead to personal in­jury. Excessive draining of condensate may cause
saturated ground conditions that may result in
damage to plants.

C) The condensate trap should be primed at initial

start up prior to heating season operation.

VENTING ROUTED THROUGH A MASONRY CHIMNEY
VENT FITTING MATERIAL – STAINLESS STEEL

Gas and liquid tight single wall metal vent fitting, de­signed 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.

DIRECTION OF STAINLESS STEEL FITTING

All stainless steel fitting must be installed with male
end towards the furnace.
All horizontal stainless steel sections must be posi­tioned with the seam on top.
All long horizontal sections must be supported to pre­vent sagging.
All pipe joints must be fastened and sealed to prevent
escape of combustion products into the building.

NOTE:
Both venting methods shown in Figure 30 & 31 must
also have the combustion air inlet installed - meeting
dimension requirements of Figure 21.

c

v

VENT

MAINTAIN 12 IN.
(18 IN. FOR CANADA)
MINIMUM CLEARANCE
ABOVE HIGHEST
ANTICIPATED SNOW
LEVEL. MAXIMUM OF
24 IN. ABOVE ROOF.

BAYAIR30AVENTA

b

REMOVE RIBS
FROM CAP

COMBUSTION
AIR

ROOF BOOT
(FIELD SUPPLIED)

VENT

CONCENTRIC VENT

ROOF INSTALLATION

ROOF TOP APPLICATION

VENT

COMBUSTION
AIR

CONCENTRIC VENT

MAINTAIN 12 IN.
(18 IN. FOR CANADA)
MINIMUM CLEARANCE
ABOVE HIGHEST
ANTICIPATED SNOW
LEVEL. MAXIMUM OF
24 IN. ABOVE ROOF

SUPPORT
(FIELD SUPPLIED)

ELBOW
(FIELD SUPPLIED)

COMBUSTION
AIR

22 18-CD22D1-8

Installer’s Guide

IMPORTANT:

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:

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:

1. INSTALLATION OF CARBON MONOXIDE
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 back­up 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”.

4. INSPECTION. The state or local gas inspector of
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.
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:

American Standard, Inc.
6200 Troup Highway
Tyler, TX 75707
Attention: Manager of Field Operations Excellence

18-CD22D1-8 23

Installer’s Guide

L

N

T

STAINLESS

▲

E

S

SS

▲

n

SEAL BETWEEN FLANGE, PIPE,
COUPLING AND METAL PANEL

,

WITH HI TEMP RTV SILICONE SEALANT

SUPPORT

FLANGE

FLUE PIPE

COUPLING

TYPE 29-4C STAINLESS STEEL VENTING -

m

USED THROUGH CHIMNEY THAT VENTS

ANOTHER GAS APPLIANCE

STAINLESS STEEL

STEEL

VENT CAP

VENT CAP

(OPTIONAL)

E CAUTION

6 IN. MIN.

SUPPORT THE SINGLE WA
STAINLESS STEEL GAS
VENTING AND CENTER IT I
THE CHIMNEY OPENING WI
ANGLES AS SHOWN OR
ANOTHER EQUIVALENT
MANNER.

NOTE:
HORIZONTAL VENTING
TO VERTICAL VENTING

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 )

VENTING THROUGH CEILING

PVC PLASTIC VENTING - ONLY

.

FLUE PIPE

UPLING TO SUPPORT

PE FROM ANGLES

OTHER SUITABLE

PPORT METHOD

THROUGH UNUSED CHIMNEY

STAINLESS STEEL

TAINLE

VENT CAP

STEEL

(OPTIONAL)

VENT CAP

SEE CAUTION

FLUE PIPE

6 IN. MIN.

SUPPORT THE SINGL
WALL FLUE PIPE AND
CENTER IT IN THE
CHIMNEY OPENING WI
ANGLES AS SHOWN O
ANOTHER EQUIVALEN
MANNER.

COUPLING
AS REQUIRED

CEILING

!

CAUTION

Do NOT run vent through chimney for wood burning
or oil furnaces or incinerators.
If remaining free area between single wall flue pipe

NOTE:
HORIZONTAL VENTING
TO VERTICAL VENTING

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 con­nected to chimney with separate entry openings.

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 ma­sonry chimney.

Do NOT run vent through chimney for wood burn­ing 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-

!

CAUTION

sonry chimney.

24 18-CD22D1-8

Installer’s Guide

▲

CONDENSATE DRAIN INSTRUCTIONS

!

CAUTION

▲

IT IS RECOMMENDED THAT A DRAIN PAN BE INSTALLED
UNDER THE FURNACE TO PREVENT PROPERTY DAMAGE,
PERSONAL INJURY OR DEATH FROM LEAKING CONDEN­SATE.

VERTICAL APPLICATIONS

Upflow furnace - The connection tubing for left and
right side drainage is shipped in the blower compart­ment. Install the connection tubing from the trap to the
side of the unit and trim all excess tubing to avoid
kinks.

/

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.

HORIZONTAL APPLICATIONS

Upflow and Downflow furnaces - All horizontal appli­cations 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).

@

UPFLOW (VERTICAL)

UPFLOW HORIZONTAL

17" UNITS

(Left side only)

Right side

Use Inducer Drain

hose without

extension

!

Left side

UPFLOW (VERTICAL)

#

Use
extension
hose here

UPFLOW HORIZONTAL 21" & 24" UNITS

(Left side only)

18-CD22D1-8 25

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 reposi­tion into the other drain tap of the inducer, which is lo­cated 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 up­flow 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 caus­ing slippery conditions that could lead to personal in­jury. Excessive draining of condensate may cause satu­rated ground conditions that may result in damage to
plants.

Left

side

DOWNFLOW

(VERTICAL)

DOWNFLOW (VERTICAL)

Use CPVC tubing from Trap outlet,

over burner box to cabinet exit

%

Right

side

NOTE:
Use 1/2" or larger PVC or CPVC pipe and fittings as re­quired for drain connections (fittings, pipe and solvent
cement not provided).

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. Fro­zen condensate will block drains, resulting in furnace shut­down. If the drain line cannot be installed in a conditioned
space, then UL listed heat tape should be applied as re­quired 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.

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 pre­vent water from damaging furnace controls if the pri­mary drain outlet plugs up. Where the furnace is in­stalled 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.

26 18-CD22D1-8

ELECTRICAL CONNECTIONS

Make wiring connections to the unit as indicated on en­closed 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 protec­tion 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 Electri­cal 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 wir­ing diagram attached to furnace diagram attached to
furnace.

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 re­turns with equal pressure drops or ducts with equiva­lent lengths and sizes. See Field Wiring Diagrams for
proper hookup.

Installer’s Guide

&

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.

To drain opening

B/C

FIELD WIRING DIAGRAM FOR 1 STAGE FURNACE

1 STAGE HEATING

USING A 1 STAGE HEATING THERMOSTAT

NO COOLING

FURNACE

SEE

NOTE 7

SEE

NOTE 6

TWIN

B/C

TO 115 V 1 PH.,
60 HZ., POWER
SUPPLY PER
LOCAL CODES

HUM SEE
NOTE 5

EAC SEE
NOTE 5

From drawing B341437 Rv 1

18-CD22D1-8 27

Installer’s Guide

FIELD WIRING DIAGRAM FOR 1 STAGE FURNACE

USING A 1 STAGE HEATING, 1 STAGE COOLING THERMOSTAT

(OUTDOOR SECTION WITHOUT TRANSFORMER)

OUTDOOR UNIT

(NO TRANSFORMER)

SEE

NOTE 6

SEE

B/C

NOTE 8

1 STAGE HEATING, 1 STAGE COOLING

FURNACE

B/C

TO 115 V 1 PH.,
60 HZ., POWER
SUPPLY PER
LOCAL CODES

TWINNING CONNECTION DIAGRAM

FOR TWINNING 1 STAGE FURNACES WITH

1 STAGE HEAT

ONLY

THERMOSTAT

(WITH FAN SWITCH) FURNACE NO. 1

SINGLE WIRE TWINNING FEATURE

1 STAGE HEATING ONLY THERMOSTAT

TWIN

ISOLATION RELAY

(FIELD SUPPLIED)

SEE NOTE 4

R1

HUM SEE
NOTE 5

EAC SEE
NOTE 5

FURNACE NO. 2

BLOWER OPERATION OF
UNIT NO. 2 IS SYNCRONIZED
WITH UNIT NO. 1 VIA SIGNALS

FROM TWIN CONNECTION.

TWIN

SEE NOTE 4

From drawing B340388 Rv 2

R1

ISOLATION RELAY

SEE NOTE 4

B/C

SEE NOTE 3

B/C

B/C

From Dwg. 21B341422 Rev. 3

28 18-CD22D1-8

OUTDOOR UNIT

(WITH TRANSFORMER)

RC

ISOLATION RELAY
(FIELD SUPPLIED)

SEE NOTE 3

OUTDOOR UNIT

(NO TRANSFORMER)

TWINNING CONNECTION DIAGRAM

FOR TWINNING 1 STAGE FURNACES WITH

SINGLE WIRE TWINNING FEATURE

1 STAGE

HEATING / COOLING

THERMOSTAT FURNACE NO. 1

1 STAGE HEAT / 1 STAGE COOL THERMOSTAT

TWIN

FURNACE NO. 2

BLOWER OPERATION OF

UNIT NO. 2 IS SYNCRONIZED

WITH UNIT NO. 1 VIA SIGNALS

FROM TWIN CONNECTION.

TWIN

SEE NOTE 4

Installer’s Guide

R1

ISOLATION RELAY

SEE NOTE 4

B/C

SEE NOTE 5

B/C

GAS PIPING

The upflow/ horizontal furnace is shipped standard for
left side installation of gas piping. A knockout is pro­vided on the right side for an alternate gas piping ar­rangement. See Figure 37.
The installation of piping shall be in accordance with
piping codes and the regulations of the local gas com­pany. 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 in­stalled 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).

R1

B/C

ISOLATION RELAY
(FIELD SUPPLIED)

SEE NOTE 4

From Dwg. 21B341423 Rev. 2

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!

18-CD22D1-8 29

Installer’s Guide

*

MAIN MANUAL

SHUTOFF VALVE

GROUND

UNION

JOINT

DRIP

LEG

UPFLOW – LEFT HAND GAS PIPING

(

AUTOMATIC GAS VALVE

WITH MANUAL SHUTOFF

AUTOMATIC GAS VALVE

WITH MANUAL SHUTOFF

MAIN MANUAL

SHUTOFF VALVE

GROUND

UNION

JOINT

DRIP

LEG

UPFLOW – RIGHT HAND GAS PIPING

THE DOWNFLOW (VERTICAL) MAY BE INSTALLED LEFT OR RIGHT SIDE GAS PIPING

)

AUTOMATIC GAS VALVE

WITH MANUAL SHUTOFF

MAIN MANUAL

SHUTOFF VALVE

GROUND

UNION JOINT

DRIP
LEG

MAIN MANUAL

SHUTOFF VALVE

AUTOMATIC GAS VALVE

WITH MANUAL SHUTOFF

GROUND UNION JOINT

DRIP
LEG

HORIZONTAL FURNACE GAS PIPING MAY BE FROM EITHER SIDE (UPFLOW SHOWN)

30 18-CD22D1-8

▲

!

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

PIPE

SIZE

1/2 132 92 73 63 56 50 46

3/4 278 190 152 130 115 105 96

1-1/4 1050 730 590 520 440 400 370

This table is based on pressure drop of 0.3 inch W.C. and 0.6 SP.GR. gas

10 20 30 40 50 60 70

1 520 350 285 245 215 195 180

LENGTH OF PIPE

TABLE 11

ORIFICE SIZES

INPUT

RATING

BTUH

40,000
60,000

80,000
100,000
120,000

NUMBER

OF

BURNERS

2
3
4
5
6

MAIN BURNER ORIFICE

DRILL SIZE

NAT. GAS LP GAS

45
45
45
45
45

56
56
56
56
56

COMBUSTION AND INPUT CHECK

1. Make sure all gas appliances are off except the fur­nace.

2. Clock the gas meter with the furnace operating (de­termine the dial rating of the meter) for one revolu­tion.

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 sec­onds 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.

Installer’s Guide

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.
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.

18-CD22D1-8 31

Installer’s Guide

▲

▲

Q

!

CAUTION

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, ex­plosion, or property damage.

NOTE:
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 tub­ing, between the tee coming from the burner box tube
and the gas valve,
pressure tap on the outlet side of the gas valve. See
Figure 51.

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 fur­nace. If a change of orifices is required to correct the
furnace input rating refer to Table 14.

FINAL MANIFOLD PRESSURE SETTINGS

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 eleva­tions up to 2,000 ft.

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 sup­plier for the gas being delivered at the installed altitude.

in addition to the regular gas valve

!

CAUTION

TABLE 12

FUEL PRESSURE

Input rate changes can be made by adjusting the mani­fold 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.

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,

TABLE 13

GAS FLOW IN CUBIC FEET PER HOUR

2 CUBIC FOOT DIAL

SEC. FLOW SEC. FLOW SEC. FLOW SEC. FLOW

8 900 29 248 50 144 82 88

9 800 30 240 51 141 84 86
10 720 31 232 52 138 86 84
11 655 32 225 53 136 88 82
12 600 33 218 54 133 90 80
13 555 34 212 55 131 92 78
14 514 35 206 56 129 94 76
15 480 36 200 57 126 96 75
16 450 37 195 58 124 98 73
17 424 38 189 59 122 100 72
18 400 39 185 60 120 104 69
19 379 40 180 62 116 108 67
20 360 41 176 64 112 112 64
21 343 42 172 66 109 116 62
22 327 43 167 68 106 120 60
23 313 44 164 70 103 124 58
24 300 45 160 72 100 128 56
25 288 46 157 74 97 132 54
26 277 47 153 76 95 136 53
27 267 48 150 78 92 140 51
28 257 49 147 80 90 144 50

32 18-CD22D1-8

Installer’s Guide

▲

W

ROTATE THE FRONT
COVER AS SHOWN

INSERT THE TOP
FLANGE OF THE
FRONT COVER
UNDER THE LIP
INSIDE THE BOX

ALL SIDE FLANGES
MUST BE OUTSIDE
OF THE BOX

ROTATE THE FRONT
COVER INWARD
MAKING SURE THAT
ALL SIDE FLANGES
ARE OUTSIDE OF THE
BOX.

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.

IMPORTANT:
Re-install the propane orifices to the same depth as the
orifices supplied with the equipment.

See Table 15 for help in selecting orifices if orifice
change is required. Furnace input rate and tempera­ture rise should be checked again after changing ori­fices 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.

TABLE 14

PART NUMBERS FOR REPLACEMENT ORIFICES

DRILL

SIZE

44
45
46
47
48
49
50

PART

NUMBER

ORF00501
ORF00644
ORF00909
ORF00910
ORF01099
ORF00503
ORF00493

DRILL

SIZE

54
55
56
57
58
59

PART

NUMBER

ORF00555
ORF00693
ORF00907
ORF00908
ORF01338
ORF01339

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.

TABLE 15

Orifice

Twist Drill

Size If

Installed

At Sea

Level

42
43
44
45
46
47

54
55
56
57
58

2000 3000 4000 5000 6000 7000 8000 9000 10000

42
44
45
46
47
48

54
55
56
58
59

From National Fuel Gas Code - Table F-4

ALTITUDE ABOVE SEA LEVEL

and Orifice Required At Other Elevations

43

43

43

44

44

45

44

44

45

45

47

47

47

47

48

49

55

55

55

55

56

57

59

59

60

60

!

WARNING

45
46
47
48
49

55
56
57
60

61

45
47
48
48
49

55
56
57
60
62

46
47
48
49

50

55
56
58
61
62

47
48
49
49
50

56
56
59
62
63

46
47
48
49
50
51

56
56
59
63
63

47
48
50
50
51
52

56
57
60
63
64

CARBON MONOXIDE POISONING HAZARD
Failure to follow the installation instructions for the
venting system being placed into operation could re­sult in carbon monoxide poisoning or death.

START UP AND ADJUSTMENT

PRELIMINARY INSPECTIONS

With gas and electrical power “OFF”

1. Duct connections are properly sealed

2. Filters are in place

3. Venting is properly assembled

4. Blower door is in place

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 min­utes for any gas that might have escaped to dissipate.
LP Gas being heavier than air may require forced venti­lation. Flip the switch on the gas valve in the unit to
the “ON” position.

E

Inlet Pressure
Boss (opt.)

Outlet Pressure Boss

On/Off Switch

White-Rodgers 36G gas valve

Regulator
Adjustment

18-CD22D1-8 33

Installer’s Guide

▲

▲

On/Offff

Switchch

R

LIGHTING INSTRUCTIONS

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 instal­lation 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.
Turn on the main electrical supply and set the thermo­stat 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.

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.

If this is done during the cold weather months, provi­sions 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.

Swi

White-Rodgers 36F gas valve

!

WARNING

!

CAUTION

SEQUENCE OF OPERATION
Thermostat call for heat

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 approxi­mately 20 seconds, then the gas valve is energized to
permit gas flow to the burners. The flame sensor con­firms 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 sec­onds the indoor blower motor will be energized and con­tinue 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-en­ergized. 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 mod­ule.

CONTROL AND SAFETY SWITCH ADJUSTMENTS
LIMIT SWITCH CHECK OUT

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 indi­cated 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 over­heating 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 pa­per or cardboard from the return air inlet. Refer to Ser­vice Facts for additional instructions.

NOTE TO INSTALLER

Review the following warnings with the owner. Review
contents of USER’S INFORMATION MANUAL with the
owner.

34 18-CD22D1-8

Installer’s Guide

▲

AIRFLOW ADJUSTMENT

Check inlet and outlet air temperatures to make sure
they are within the ranges specified on the furnace rat­ing nameplate. If the airflow needs to be increased or
decreased, see the wiring diagram for information on
changing the speed of the blower motor.

!

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 shut­down when the door is removed. Operation with the
door removed or ajar can permit the escape of danger­ous fumes. All panels must be securely closed at all
times for safe operation of the furnace.

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 sec­onds. The factory setting is 100 seconds (See wiring
diagram).
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

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 sup­ply off at the manual gas valve, located in the burner
compartment. Also turn off electrical power to the fur­nace and contact the service agency designated by
your dealer.

BURNER BOX TEMPERATURE LIMIT DEVICE

All models are equipped with a manual reset tempera­ture limit located on the burner box. In case of exces­sive temperature, the limit will open and cause the cir­cuit to open which shuts off all flow of gas.

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 be­comes excessive, the pressure switch will open and
shut off the gas valve until acceptable combustion
pressure is again available.

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.

3. POWER FAILURE

If there is a power failure during a heating cycle,
the system will restart the ignition sequence auto­matically when power is restored if the thermostat
still calls for heat.

4. GAS SUPPLY FAILURE

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.

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 con­densate in the furnace drain pan. The pressure
switch contacts will open and remain open, not al­lowing unit operation. The unit will not operate un­til 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 ther­mostat. The system will not reset unless the proce-

dure off-on-off-on is completed within 30 seconds.

18-CD22D1-8 35

Installer’s Guide

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 de­pressed. 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 Commis­sion recommends that users of gas-burning appliances
install carbon monoxide detectors as well as fire and
smoke detectors per the manufacturers installation in­structions to help alert dwelling occupants of the pres­ence of fire, smoke or unsafe levels of carbon monoxide.
These devises should be listed by Underwriters Labora­tories, Inc. Standards for Single and Multiple Station
Carbon Monoxide Alarms, UL 2034 or CSA Interna­tional Standard, Residential Carbon Monoxide Alarming
Devices, CSA 6.19.

NOTE:
The manufacturer of your furnace does not test any de­tectors and makes no representations regarding any
brand or type of detector.

36 18-CD22D1-8

Installer’s Guide

INTEGRATED FURNACE CONTROL ERROR FLASH CODES

Flashing Slow --- Normal - No call for Heat
Flashing Fast --- Normal - Call for Heat
Continuous ON --- Replace IFC
Continuous OFF --- Check Power
2 Flashes --- System Lockout (Retries or Recycles exceeded)

Draft Pressure Error - Possible problems:

3 Flashes ---

4 Flashes --- Open Temperature Limit Circuit
5 Flashes --- Flame sensed when no flame should be present
6 Flashes --- 115 volt AC power reversed, poor grounding or system voltage too low
7 Flashes --- Gas valve circuit error
8 Flashes --- Low flame sense signal

9 Flashes ---

a) Venting problem
b) Pressure switch problem
c) Inducer problem

Check Ignitor Circuit and Line "N" to 24VAC "Common" voltage (≤ 2 volts)
[possible grounding problem]

18-CD22D1-8 37

Trane
6200 Troup Highway
Tyler, TX 75707

For more information contact
your local dealer (distributor)

Literature Order Number 18-CD22D1-8

File Number 18-CD22D1-8

Supersedes 18-CD22D1-7

Date 05/08

Since the manufacturer has a policy of continuous product and product data improvement, it reserves the right
to change design and specifications without notice.