Trane TUC1B040A9241A, TUC1B060A9361A, TUC1B080A9421A, TUC1C100A9481A, TUC1D100A9601A Installer's Manual

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Installer’s Guide

Upflow/ Horizontal and Downflow/ Horizontal
Gas-Fired Condensing Furnaces

*UC1B040A9241A
*UC1B060A9361A
*UC1B080A9421A
*UC1C100A9481A

*__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.

*UC1

*UC1D100A9601A
*UC1D120A9601A
*DC1B040A9241A
*DC1B060A9361A

*DC1B080A9421A
*DC1C100A9481A
*DC1D120A9601A

*DC1

DOWNFLOW

UPFLOW/ HORIZONTAL

UPFLOW

DOWNFLOW/ HORIZONTAL

A341624P01

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 16-

26), 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” (page 32), 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 require-

ment 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.

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 DANGER,
WARNING, and CAUTION.

a. DANGER indicates an imminently hazardous situa-

tion which, if not avoided, will result in death or seri­ous injury. This signal word is limited to the most ex­treme situations.

b. WARNING indicates a potentially hazardous situation

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

c. 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

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.

© 2009 Trane All Rights Reserved 18-CD19D5-25

Installer’s Guide

▲

▲

▲

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 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.

!

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.
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.

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 16
Venting Material 16
Venting Tables 18
Horizontal Venting 21
Venting Through The Wall 21
Venting Through The Roof 25
Downward Venting 25
Venting Through a Masonry Chimney 26
Condensate Drain Instructions 27
Electrical Connections 29
Field Wiring Diagrams 29
Gas Piping 32
Combustion Input Checks 33

Start Up and Adjustment 35

Preliminary Inspections 35
Lighting Instructions 36
Sequence Of Operation 36
Control And Safety Switch Adjustments 36
Airflow Adjustment 37

Abnormal Conditions 37

IFC Error Flash Code 39

!

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.

18-CD19D5-25 3

Installer’s Guide

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.

IMPORTANT:

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-CD19D5-25

18-CD19D5-25 5

Installer’s Guide

*UC1 OUTLINE DRAWING

(ALL DIMENSIONS ARE IN INCHES)

6 18-CD19D5-25

Installer’s Guide

*DC1 DOWNFLOW/ HORIZONTAL OUTLINE DRAWING

(ALL DIMENSIONS ARE IN INCHES)

Installer’s Guide

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6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

UPFLOW INSTALLATION

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)

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"

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 2/4TXC cased coil in the horizontal posi-
tion. See Figure 3.

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.

4

CASED COIL CONNECTION

BRACKET FOR DOWNFLOW

FURNACE IN HORIZONTAL

DOWNFLOW ONLY

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 (BAYBASE-

205) 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:

2

SUBBASE CROSS SECTION

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3

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FURNACE

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FRONT

18-CD19D5-25 7

A (width)

B (depth)

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.
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
for proper clearances on all sides and service access to
the front of the furnace (See Figure 5 & 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.

D

C

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.

Installer’s Guide

5

UPFLOW/
HORIZONTAL
SHOWN

The furnace must be supported at both ends and
the middle when installed horizontally.
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.

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.

6

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
Furnace locations may be in a “confined space” or an
“unconfined space”.
Unconfined space is defined in Figure 6. These spaces
may have adequate air by infiltration to provide air for
combustion and ventilation. Buildings with tight
construction (for example, weather stripping, heavily
insulated, caulked, vapor barrier, etc.), may need addi­tional air to be provided as described for confined space.
Confined spaces are installations with less than 50 cu.
ft. of space per 1000 BTU/hr input from all equipment
installed. Air for combustion and ventilation require­ments can be supplied from inside the building as in
Figure 8 or from the outdoors, as in Figure 9.

8 18-CD19D5-25

Installer’s Guide

TABLE 2

MINIMUM AREA IN SQUARE FEET

FOR UNCONFINED SPACE INSTALLATIONS

FURNACE

MAXIMUM BTUH

INPUT RATING

60,000

80,000
100,000
120,000

MINIMUM AREA IN SQUARE FEET

WITH 8 FT. CEILING

OF UNCONFINED SPACE

375
500
625
875

7

CONFINED

SPACE

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.

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 3, for minimum open
areas requirements.

TABLE 3

MINIMUM FREE AREA IN SQUARE INCHES

EACH OPENING (FURNACE ONLY)

8

9

Furnace

Maximum

BTUH/INPUT

Rating

60,000

80,000
100,000
120,000

18-CD19D5-25 9

Air

From

Inside

100
100
100
120

Vertical

Duct

Air From Outside

Horizontal

15
20
25
30

Duct

30
40
50
60

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 CONNECTION

NOTE:
On upflow 5 or 6 ton airflow models where the
airflow requirement exceeds 1800 CFM - Models will
require return air openings and filters on: (1) both
sides; or (2) one side and the bottom; or (3) just the
bottom.

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 connect to the existing supply
and return ductwork.

2. For side return installations on upflow models,
remove the insulation around the opening in the
blower compartment.

10 18-CD19D5-25

3. The side panels on upflow furnaces include locating
notches which may be used as guides for cutting an
opening for return air. Refer to Figure 11 and the
outline drawing on page 5 for duct connection
dimensions for various furnaces.

4. If a 3/4" flange is to be used for attaching the air
inlet duct, add to cut where indicated by dashed
lines in Figure 11. Cut corners diagonally and bend
outward to form flange.

5. If flanges are not required, and a filter frame is
installed, cut along knockout guidelines.

6. Upflow Furnaces: Use the optional filter rack on
either side or on the bottom if the filter is to be
used within the furnace cabinet.

When the upflow furnace is installed in the horizon­tal right or left application and a return duct is
attached to the top side as shown in Figure 10,
install the filter in a remote location.

!

WARNING

Do not install the filter in the return duct directly above the
furnace in horizontal applications. Install the filter remotely.
Installing the filter directly above the furnace in horizontal
applications may cause property damage, serious injury or
death.

!

WARNING

TO PREVENT INJURY OR DEATH DUE TO CONTACT
WITH MOVING PARTS, TURN THE POWER TO THE
FURNACE OFF BEFORE SERVICING FILTERS.

Do not install the filter in the return duct directly
above the furnace in horizontal applications.

When the upflow furnace is installed in the horizon­tal right or left application and a close coupled (less
than 36") return duct is attached to the bottom side
of the furnace as shown in Figure 10, securely
attach a 1/2" mesh metal hardware cloth protective
e screen to the inside bottom of the filter grill to

prevent personal injury from contacting
moving parts when reaching into the return
opening to replace the filter.

Close coupled (less than 36") return (filter directly
beneath bottom side return) is not recommended
due to noise considerations.

Downflow Furnaces: Brackets are factory
supplied to mount filters in the return air duct
work.

7. Connect the duct work to the furnace. See Outline
Drawing (pages 5&6) for supply and return duct size
and location. Flexible duct connectors are recom­mended to connect both supply and return air ducts
to the furnace.

Installer’s Guide

REMOVE FILTER FROM UPFLOW
FURNACE WHEN RETURN DUCT IS
ATTACHED TO FURNACE TOP SIDE
(HORIZONTAL LEFT OR RIGHT
APPLICATIONS) AS SHOWN.

Close coupled (less than 36")
return (filter directly beneath bottom
side return) not recommended due to
noise considerations. If used, securely
attach 1/2" mesh metal hardware cloth
protective screen to the inside bottom of
filter grill.

If only the front of the furnace is accessible, it is
recommended that both supply and return air
plenums are removable.

8. When replacing a furnace, old duct work should be
cleaned out. Thin cloths should be placed over the
registers and the furnace fan should be run for
10 minutes. Don’t forget to remove the cloths
before you start the furnace.

FILTER

0

RETURN AIR FILTERS

(Filter and filter rack are not supplied with unit)

TYPICAL UPFLOW RETURN AIR FILTER INSTALLA­TIONS

These furnaces require high velocity type air filters.
The optional filters may be located within the furnace
blower compartment for UPFLOW furnaces in either a
BOTTOM or SIDE (left side or right side) return air
inlet. Some optional filters may need to be trimmed for
side or bottom filter use.

The furnace and the blower filter rack installation can
be seen in Figure 12 & 13.

The optional 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.

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.

TABLE 4

MODELS

NUMBERS

*UC1B040A9241A
*UC1B060A9361A
*UC1B080A9421A

*UC1C100A9481A 21" 1 - 20" X 25" X 1"

*UC1D100A9601A##
*UC1D120A9601A##

*DC1B040A9241A
*DC1B060A9361A
*DC1B080A9421A

*DC1C100A9481A 21" 2 - 16" X 20" X 1"

*DC1D120A9601A 24-1/2" 2 - 16" X 20" X 1"

## - Requires filters on 2 sides OR 1 side and bottom
filter or just the bottom

CABINET

WIDTH

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

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

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

FILTER

QTY & SIZE

NOTE:

On upflow 5 or 6 ton airflow models where the
airflow requirement exceeds 1800 CFM - Models will
require return air openings and filters on: (1) both
sides; or (2) one side and the bottom; or (3) just the
bottom.

q

LOCATING
NOTCHES
PROVIDED
FOR SIDE
RETURN
CUTOUT

*

*

*

*

SEE OUTLINE DRAWING

*

18-CD19D5-25 11

CUT OUT

FOR

SIDE

FILTER

FRONT

of Furnace

Installer’s Guide

w

Airflow

NOTE: The narrow 14.5" width furnace cabinet prevents use
of the filter rack for right side return. Pre-drill clearance
holes and then attach filter clips with the screws provided.
The filter clip with the leaf spring mounts in the rear of the
cabinet

OPTIONAL FILTER RACK INSTALLATION FOR BOTTOM
RETURN

With the filter removed, the filter rack is compressed 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 Figures 13, 14 & 16.

NOTE: Remove the bottom front channel to install the filter
rack in the 14-1/2" width cabinet furnaces.

t

e

r

Airflow

BOTTOM FILTER RACK INSTALLATION

Blower Deck
Engagement

Hole

ENGAGEMENT

HOLE DETAIL

(Typical both sides
and blower deck)

y

Furnace

Cabinet

Side

VIEW

Filter
Rack

Optional Filter Rack Accessory Kit

BAYRACK960A

12 18-CD19D5-25

Engagement Hole
For

Filter Rack
Installation With
Bottom Return

Filter Rack
Retaining
Screw/Pin