Trane AUX1B040A9H21B, AUX1B060A9H31B, AUX1B080A9H31B, AUX1C100A9H41B, AUX1D120A9H51B Installer's Manual

18- CD22D1- 5

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 NA TIONAL, STA TE AND LOCAL CODES

IMPORT ANT— 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 3), 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 11-18), 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 22-23), 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 3), 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 thermostat
(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 Farenhiet.

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.

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 situation

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

!

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 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 gas­fired burning appliance to their previous conditions of
use.

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

▲

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.

© 2006 American Standard Inc. All Rights Reserved 18-CD22D1-5

Installer’s Guide

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, 8501 E. Pleasant Valley Rd.,
Cleveland, Ohio 44131.

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.

!

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.

Contents

INST ALLA TION INSTRUCTIONS

General Installation Instructions 3
Location and Clearances 3
Outline Drawings 4-5
Upflow Installation 6
Downflow Installation 6
Horizontal Installation 6
Air For Combustion and Ventilation 7- 8
Duct Connections 8
Return Air Filters 9-12
General Venting Instructions 13
Venting Material 13
Venting Tables 14-17
Horizontal Venting 18
Venting Through The Wall 18
Venting Throught The Roof 20
Downward Venting 20
Venting Through a Masonry Chimney 20
Condensate Drain Instructions 22
Electrical Connections 23
Field Wiring Diagrams 24-25
Gas Piping 26
Combustion Input Checks 27

Start Up and Adjustment 29

Preliminary Inspections 29
Lighting Instructions 29
Sequence Of Operation 30
Control And Safety Switch Adjustments 30
Airflow Adjustment 3 0

Abnormal Conditions 3 1

IFC Error Flash Code 32

!

CAUTION

▲

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

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?

18-CD22D1-5 3

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.

IMPORT ANT:

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-CD22D1-5

Installer’s Guide

*UX1-H OUTLINE DRAWING

(ALL DIMENSIONS ARE IN INCHES)

From Dwg. 21C341884 Rev. 1

18-CD22D1-5 5

*DX1-H DOWNFLOW / HORIZONTAL OUTLINE DRA WING

(ALL DIMENSIONS ARE IN INCHES)

From Dwg. 21C341885 Rev. 0

Installer’s Guide

Installer’s Guide

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

6

UPFLOW INST ALLATION

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

INST ALLATIONS:

SCREWS

(BOTH SIDES)

DOWNFLOW INST ALLATIONS

!

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:

T ABLE 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" "A" "B"

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 position. See Figure 4. The
coil is placed downstream of the furnace, with the apex of the
coil pointing in the direction of the airflow for horizontal
installation. 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

3

CASED COIL CONNECTION

on the left side

(as

BRACKET FOR DOWNFLOW

FURNACE IN HORIZONTAL

DOWNFLOW ONLY

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 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.

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

4

SUBBASE CROSS SECTION

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2

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FURNACE

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FRONT

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6 18-CD22D1-5

A (width)

B (depth)

D

C

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.

UPFLOW/
HORIZONT AL

Installer’s Guide

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

5

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

UNCONFINED

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.

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 “uncon-
fined space”.

Unconfined space

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

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.

6

FOR UNCONFINED SPACE INSTALLATIONS

FURNACE

MAXIMUM BTUH

INPUT RATING

60,000

80,000
100,000
120,000

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

is defined in Figure 5. These spaces may

.

are installations with less than 50 cu. ft. of

MINIMUM AREA IN SQUARE FEET

WITH 8 FT. CEILING

MINIMUM AREA IN SQUARE FEET

OF UNCONFINE D SPACE

375
500
625
875

7

CONFINED

SPACE

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.

All air from outdoors as in Figure 9: The confined space

2.
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 ARE A IN SQUARE INCHES

EACH OPENING (FURNACE ONLY)

Furnace

Maximum

BTUH/INPUT

Rating

60,000

80,000
100,000
120,000

DUCT CONNECTIONS

Air duct systems should be installed in accordance with
standards for air conditioning systems, National Fire Protection

18-CD22D1-5 7

Installer’s Guide

8

9

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 50° F.

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

1. Set the furnace in place.

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

3. 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 4 for duct connection dimensions for various fur­naces.

NOTE:
On upflow 5 ton airflow models, if the airflow requirement
exceeds 1800 CFM, these models will require return air
openings and filters on both sides; OR 1 side and the
bottom; OR just the bottom.

4. 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.

5. If flanges are not required, and a filter frame is installed, cut
between locating notches (See Figure 10).

8 18-CD22D1-5

Installer’s Guide

6. The bottom panel of the upflow furnace must be removed
for bottom return air. Remove the filter and lay the furnace
on its back. Remove the two 1/4" hex screws securing the
bottom front channel to the cabinet. Lower the front edge of
the bottom front channel and pull forward to remove the
channel. The bottom return air panel will now easily slide
out of the cabinet. Reinstall the bottom front channel and
filter for upflow bottom return installations.

7. 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.

The horizontal installation of the upflow furnace requires

8.

an external filter section. Do NOT use the bottom return
filter within the furnace. Filter kits are available for
horizontal applications.

9. 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

These furnaces require high velocity type air filters. The 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 filters may need to be trimmed
for side or bottom filter use.

T ABLE 3

0

LOCATING
NOTCHES PRO­VIDED FOR SIDE
RETURN CUTOUT

SEE OUTLINE DRAWING

*

UPFLOW FURNACE ONLY

q

CUT OUT
FOR SIDE
FILTER

FRONT
of Furnace

Airflow

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 - On 5 ton airflow models, if the airflow requirement
exceeds 1800 CFM, these models will require filters on both sides;
OR 1 side and the bottom; OR just the bottom.

CABINET

WIDTH

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

FILTER

QTY & SIZE

NOTE:
On upflow 5 ton airflow models, if the airflow requirement
exceeds 1800 CFM, these models will require return air
openings and filters on both sides; OR 1 side and the
bottom; OR just the bottom.

The upflow furnace blower door has a hinge at the bottom
which allows the door to tilt forward for filter replacement
without the door being removed (See 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.

Blower Door Hinge and Bottom Filter Rack Installation

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 exterior to the
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 12.

w

Airflow

TYPICAL RETURN AIR FILTER INSTALLA TION IN

UPFLOW MODEL IN HORIZONTAL POSITION

18-CD22D1-5 9

Installer’s Guide

BLOWER DOOR/HINGE REMOVAL

If clearance or other problems create a problem in using the
tilting door, the blower door hinge may be removed without
creating any problems with the seal of the furnace. To remove
the blower door, tilt the door forward 2 to 3 inches and pull up.
To remove the tilt feature, simply remove the lower hinge as
shown in Figure 13. The bottom of the blower door will catch in
the bottom of the furnace front channel for door replacement.

e

Airflow

Door Hinge Removed

ALTERNATE UPFLOW FILTER CLIP / BRACKET
INSTALLATION

1. Determine the location to be used. The furnace cabinet has
dimples for location of the alternate furnace clips (

return only

Bottom return holes are pre-drilled.

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.

). Pre-drill clearance holes with a 3/16" drill.

Side

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 15. Tables 4, 5 and 6
provide information for installation of the filter retaining brackets
shipped with downflow furnaces.

T ABLE 4

MODELS

NUMBERS

CABINET

WIDTH

FILTER

QTY & SIZE

*DX1B040A9H 21B
*DX1B060A9H 31B

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

*DX1B080A9H 31B
*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"

T ABLE 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 DU CT AGAINST THE FURNACE TO THE
SCREW HOLES FOR THE BRACKET.

RETURN

DUCT

WIDTH

DIMENSION

"A"

DIMENSION

"B"

FILTER

BRACKET

LOCATION*

r

SIDE

CUT-OUT

10 18-CD22D1-5

REAR

ALTERNATE FILTER
CLIPS LOCATION