American Standard AUXIB060A9361A, AUXIB080A9421A, AUXIC100A9481A, AUXID100A9601A, AUXID120A9601A Installer's Manual

IIIIII IIIIIIIIIIIIII IIII IIII

18- CD19D6- 27

Upflow / Horizontal and Downflow / Horizontal

Gas-Fired, Direct Vent Condensing Furnaces

*UXIB040A9241A *UXIC100A9481A
*UXIB060A9361A *UXID100A9601A
*UXIB080A9421A *UXID120A9601A
*UXIC080A9601A

*__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.

*DXIB040A9241A
*DXIB060A9361A
*DXIB080A9421A
*DXIC100A9481A
*DXID120A9601A

*DX-IN-IO

*UX-1 *DX-1

DOWNFLOW

AIR

FLOW

UPFLOW/HORIZONTAL

AIR

FLOW

A/R

FLOW

UPFLOW

DOWN FLOW/HORIZONTAL FLOW

/

\

o

A341624P06

Installer's Guide

SAFETY SECTION

The fl)llowing safety practices and precautions must be
fl)llowed during the installation, servicing, an(] operation of

this fllrnace.

1. Use only with the type of gas approved fl)r this fllrnace.
Reler to the fllrnace rating plate.

2. Install this fllrnace 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
fllrnace space as specified in "Air lot Combustion and

Ventilation" (pages 8-9), of these instructions.

4. Combustion products must be discharged outdoors.
Connect this fllrnace to an approved vent system only, as

specified in the "Venting" section (pages 11-18), of these
instructions.

5. Never test fl)r gas leaks with an open flame. Use a
commercially available soap solution made specifically

fl)r the detection of leaks to check all connections, as
specified in "Gas Piping" (pages 22-23), of these

instructions.

6. Always install the fllrnace to operate within the fllrnace's
intended temperature-rise range with a duct system
which has an external static pressure within the allow-
able range, as specified on the unit rating plate. Airfow
with temperature rise lot cfln versus static is shown in
the Service Facts accompanying this fllrnace.

7. When a fllrnace is installed so that supply ducts carry air
circulated by the fllrnace to areas outside the space
containing the fllrnace, the return air shall also be
handled by a duct(s) sealed to the fllrnace casing and
terminating outside the space containing the fllrnace.

8. A gas-fired fllrnace lbr installation in a residential garage
must be installed as specified in "Location and Clear-
ances" section (page 3), of these instructions.

9. The fllrnace may be tlsed :[or temporary heating of
buildings or structures under construction only when the

fl)llowing conditions have been met:
a. The fllrnace venting system must be complete and

installed per manufacturers instructions.
b. The fllrnace is controlled only by a room thermostat

(no field jumpers).

c. The fllrnace return air duct must be complete and
sealed to the fllrnace and clean air filters are in place.

d. The fllrnace input rate and temperature rise must be
verified to be within nameplate marking.

e. 100% of the fllrnace combustion air requirement
must come from outside the structure.

f. The fllrnace return air temperature range is between
55 and 80 degrees Farenhiet.

g. Clean the fllrnace, duct work, and components upon
substantial completion of the construction process, and

verily/fllrnace 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 lbr salety 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 situa-

tions.

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 opera-
tion, 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 horizon-

tal 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 sum-

mer 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 accor-
dance 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.

b.

WARNING indicates a potentially hazardous situation

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

c.

CAUTION indicates a potentially hazardous situation

which, if not aw_ided, may result in minor or moderate
injury. It is also used to alert against unsafe practices
and hazards inw_lving only property damage.

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-CD19D6-27

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 fl)llowed in
estimating heating requirements. When estimating heating
requirements _br 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 installa-
tion of gas fired equipment, wiring, plumbing, and flue

connections must be adhered to. In the absence of local codes,
the installation must confl)rm with latest edition of the
National Fuel Gas Code ANSI Z223.1 • National Installation

Code, CAN/CGA B 149.1. The latest code may be obtained
fl'om the American Gas Association Laboratories,

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

These flwnaces have been classified as CATEGORY IV

flwnaces in accordance with latest edition of ANSI Z21.47 •
CAN/CGA 2.3 standards.

Category IV flwnaces 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
flwnaces are approved for installation in Manutactured/
Mobile housing when used with BAYMFGH 100A.

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

INSTALLATION INSTRUCTIONS

General Installation Instructions
Location and Clearances

Outline Drawings
Upflow Installation

Downflow Installation
Horizontal Installation

Air For Combustion and Ventilation
Duct Connections
Return Air Filters

General Venting Instructions
Venting Material

Venting Tables
Horizontal Venting
Venting Through The Wall
Venting Throught The Roof

Downward Venting
Venting Through a Masonry Chimney

Condensate Drain Instructions
Electrical Connections

Field Wiring Diagrams
Gas Piping

Combustion Input Checks

Start Up and Adjustment

Preliminary Inspections
Lighting Instructions
Sequence Of Operation

Control And Safety Switch Adjustments
Airflow Adjustment

Abnormal Conditions

IFC Error Flash Code

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, beibre the
fllrnace is moved into place, be sure to consider the fl_llowing

requirements:

1. Is the location selected as near the vent and as central-
ized fl_r heat distribution as practical?

2. Do all clearances between the flwnace and enclosure
equal or exceed the minimums shown in the Table 1.

3. Is there sufficient space lbr servicing the flwnace and
other equipment? A minimum of 24 inches front accessi-
bility to the flwnace 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 fllrnace
front panel and any closed panel or door provided?

18-CD19D6-27 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 flwnace to provide lbr cooling coil installation if the
cooling coil is not installed at the time of this flwnace

installation.

7.

A flwnace shall be installed so electrical components are
protected from water.

8.

If the flwnace 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 flwnace must be located or protected to
aw_id 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 installa-

tions. This is necessary for proper condensate drainage.

o
I:D

r.D

E:I

Ob

go

/5" KNOCKOUr

DRAN

(AL_ iNAT[)

MINIMUMCLEARANCETO
COMBUSTIBLEMATERIALS

LPFLOW

SIDES O iN
_EAN O i_
FIONT 3 _
TOP i i_,

L, O N

HORIZONTAL (FLUE
DISCHARGE ON THE LEFTI

SIDES

RI@H[ 0 N

LEFT O N
NE/,R 6 iN
FRONT i8 iN
TOP N

L,,E N

CLOSET

SDES

NIGHT iN

LEFT iN
REAR i N
FRONT iN
OP N
FLUE N

Y

DIM "D-

_L_

INLETAIR ' _i

24 1/32"

3 7/32

NOTES:

I * X _10 960 REOUiR 5 3" DIAMETER V[I_Y PiPE

_XiO0 948 ?_ _UXi00¢960 RFOUIR_S 2¸i/2" OR 3"
D[AM[TRR VENT PIPE

2 DIAMETER OF VENT PiP_ MAY BE Li_fT[D TO 2 I/2" OR 3"

ON SOME MODELS AT Di_LRENT ALTii_D[S REFER _0 T_[
VENT LF/GTH TA@LE _OR PROPER APPLICA_iON

(SEE NoTEMODELI&2) DIM "A" DIM "B" DIM "C" DIM "[3" DIM "E" DIM "F

_UX iBO4OAgP/I i A*
_,UXi5060A936i ^*
_UX iBO80A942i ^"
_'UXO60R936*_'
_UX080'!942_ _
_UYOGQRgVS_

_UYO8OR9V3_

_UX 5040A9 21""
_UX BO60A963 *"
_,UX BOSOAgN3 "*

i7 i/2" 2 i/4" i6 i/4 16 7 1/2"

_'UXiG i 00A948i"_
÷UX iC080A960 i ^"
_UX i00R948÷÷
_,UY OORf,V4_'_
_UX ', i 00,'/9H4 i_

_UX biOOA960i'_
_UX D120A960 i ^"
_UX POR960_
*UY 20R9VD_,
_UX Di2OA9Hbi_"

2i 2 i/2" i9 3/4 i9 i/2 9

24 i/2" ? i5/i6" 23 i/4 2 " I0

3 _

3"

PREFIX MAY BE A OR "Y"

_ SUFF X LL}TER VAY isE "D" 0 THRU 9

_ SUFFIX LLTTEN MAY iE "W" 0 THRU 9

^ SUFFIX LLYTER MAY _[ A /_

From Dwg. 21C341884 Rev. 4

m
m

0

E,

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/ _?CONNKC Tu

/

//' S NOT

/ _B

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OR iO_'_TAL {/)"d} I,,S:'T_

[}Ri_ I N \

I 7/8' x 7/8'

/2

SLOT v_,,OC KOU T \,

_ /8" -_

ECTRiCAL

SUPP Y

OA$ CONNKC I0

(ALTEi_ AT: ) K OCKOUT

*DX-C DOWNFLOW / HORIZONTAL OUTLINE DRAWING

(ALL DIMENSIONS ARE IN INCHES)

7 3/8 _

/--CONNECT_7/8 @LKC RCALoN(AL}EB!,_AT }

/

7 314

PR X MAv B A 0 T

_ SUF X TIER S,IA7 BL D 0 _P 9

_ SUFFIX L(ITER MAV BE 'W" 0 T_NU 9

A SUPri× L_TTER MM' @_ A Z

NOTS:

I I}}A!/ET R OF VFN PIPE ray BF _<qlFD

0 2 i/:_" OR 3' ON S@{E MOO LS AT DIRR R f';
,_L TUOES REFER TO THE V S,T L fsq}TH T,_!_LE
FOr7 _70PER APPLfCATiON

MODEL A B C D

*DX1 B040A9241A
*DX1B060A9361A 17-1!2" 2-1/4" 16-1/4" 16"

*DX1 B080A9421A
*DX1C100A9481A 21" 2-1/2"" 19-3/4" 19-1/2"

*DX1D120A9601A 24-1/2" 2-15/16" 23-1/4" 23"

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

MINIMUMCLEARANCETO
COMBUSTIBLEMATERIALS

DOWNFLOW

SIDES O
_EAR O
RONT 3 N
'OP
U O

.....................................HORIZONTAL IFLUE

DISCHARGE ON THE LEFT}

ALCOVE

S_DES

RIOF C N

LEFT O iN
REAR 6 N
FRONT 8 IN

CLOSET

SIDES

RIGH T iN

LEFT N
REAR iN
FRONT iN

TOP i N

FLUE IN

From Dwg. 21C341885 Rev. 4

m

m
m

=__,

Installer's Guide

iiiiiiiiiiii

UPFLOW INSTALLATION

Standofl_s and screws (See Figure 1) are included with the
cased coils Ior 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
standofl' is inserted into the cabinet alignment hole. The drill
screws are inserted through the standofl's then screwed into
the furnace flange.

The coil is always placed downstream of the furnace airflow.

(_ STANDOFFS (4) DRILL SCREWS (4)

,g

FOR VERTICAL

INSTALLATIONS:

SCREWS

TABLE 1

CABINET RETURN FLOOR OPENING PLENUM OPENING

WIDTH DUCT WIDTH "A .... B.... A.... B"

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"

HORIZONTALINSTALLATION

The coil and filrnace must be fidly supported when used in the
horizontal position. It is always recommended that an
auxiliary drain pan be installed under a horizontally in-
stalled evaporator coil or 90% gas lurnace. 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 coilpointing in the direction of the airflow lor 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 (lor downflow/horizonml fllrnace). Use tour 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.

STANDOFFS

(BOTH SIDES)

DOWNFLOW INSTALLATIONS

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:

CABINET SIDE _ CABINET SIDE

FLANGE -- / FLANGE
(BENT UP) -- (BENT UP)
SUB-BASE _ SUB-BASE

SUB-BASE _ _ SUB-BASE

SUBBASE CROSS SECTION

_) CASED COIL CONNECTION

BRACKET FOR DOWNFLOW

FURNACE IN HORIZONTAL

DOWNFLOW ONL Y

The fllrnace 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 plat-
lorm large enough to allow tot proper clearances on all sides
and service access to the front ofthe furnace (See Figure 4 &
Clearance Table). Line contact is only permissible between
lines Iormed by intersections of the top and two sides of the
furnace casing and buildingjoists, studs, or framing.

©

6 18-CD19D6-27

The furnace may be placed horizontally in a crawl space on a
pad or other noncombustible material which will raise the
unit tot sufficient protection from moisture. The furnace

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

Installer's Guide

The furnace must also be elevated a minimum o['6

inches to allow clearance for the condensate drain to

exit the cabinet in the horizontal position.

The horizontal fllrnace may also be suspended from the joists

using 3/8" all-thread rods with pieces of angle iron under-
neath the furnace to lbrm a hanging rack at both ends anti the
midpoint. The rods need to be of sufficient length to allow liar
proper clearances from combustible materials. The angle iron
needs to be at least 32" in length to allow for access to service
panels.

@

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

ALL EQUIP. INSTALLED

"i;""O"Y'"

W'T'"]OLO,..S

UNCONFINED

AIR FOR COMBUSTION AND VENTILATION

If these furnaces are installed in a nondirect vent capacity
then the adequate flow of combustion anti ventilating air
must not be obstructed from reaching the furnace. Air open-
ings provided lbr combustion air must be kept free of obstruc-

tions which restrict the flow of air. Airflow restrictions aflect
the efficiency anti sale operation of the furnace. Keep this in

mind should you choose m remodel or change the area which
contains your furnace. Furnaces must have a free flow of air
lbr proper performance.

Provisions lbr combustion anti ventilation air shall be made
in accordance with latest edition of Section 5.3, Air lbr

Combustion anti Ventilation, of the National Fuel Gas Code,
ANSI Z223.1 -- CAN/CGA B149.1 or applicable provisions of

the local btdlding codes. Special conditions created by
mechanical exhausting of air anti fireplaces must be con-
sidered to aw_id unsatisfactory l_lrnace operation.

OUTSIDE AIR IS RECOMMENDED

The use of indoor air lbr 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 lot combustion.

The fl)llowing types ofinstallations will require use of

OUTDOOR AIR lbr 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 lbllowing 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 sol_ening chemicals
*Deicing salts or chemicals

* Carbon Tetrachloride
*Halogen type reli'igerants

* 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".

Unc'mlfined space is defined in Figure 5. These spaces may
have adequate air by infiltration to provide air lbr combustion
anti ventilation. Buildings with tight construction (lbr
example, weather stripping, heavily insulated, caulked, vapor
barrier, etc.), may need additional air to be provided as
described lbr confinect space.

C'onf_ned spaces are installations with less than 50 cu. ft. of
space per 1000 BTU/hr input from all equipment installed.
Air Áor combustion and ventilation requirements can be
supplied from inside the building as in Figure 8 or from the
outdoors, as in Figure 9.

MINIMUM AREA IN SQUARE FEET

(_FOR UNCONFINED SPACE INSTALLATIONS

FURNACE WITH 8 FT. CEILING

MAXIMUM BTUH MINIMUM AREA IN SQUARE FEET

INPUT RATING OF UNCONFINED SPACE

60,000 375

80,000 500
100,000 625
120,000 875

Q I FURNACE _'_1

m

CONFINED

SPACE

LESS THAN 50 CU. FT.
PER 1000 BTU/HR. INPUT

ALL EQUIP. INSTALLED

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 lbr an unconfined space.
The total input of all gas utilization equipment installed
in the combined space shall be considered in making this

determination. Reler 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 anti one com-

mencing 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. Reler to Table 2, for

minimum open areas requirements.

TABLE 2

MINIMUM FREE AREA IN SQUARE INCHES

EACH OPENING FURNACE ONLY)

Furnace

Maximum

BTUH/INPUT

Rating

60,000

80,000

100,000
120,000

Air

From

Inside

100
100

100
120

Air From Outside

Vertical

Duct

15

20
25

30

Horizontal

Duct

30
40

50
60

18-CD19D6-27 7

iiiiiiiiiiii

Installer's Guide

®

CONFINED SPACE
AIR FROM INSIDE BUILDING

CONFINED
SPACE

®

CONFINED SPACE
AIR FROM OUTDOORS

L

CONFINED-
SPACE

CONFINED SPACE k
AIR FROM VENTILATED ATTIC/CRAWL SPACE

_ ATTIC LOUVERS

CONFINED - AIR
SPACE

ALTERNATE INLET

INLET A_R _ AIR DUCT

PERMANENT
OPENINGS

_J

,UTLET

DOORS

DUCT CONNECTIONS

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

Protection Association Pamphlet No. 90. They shouM be sized
in accordance with ACCA Manual D or whichever is appli-

cable.
Central filrnaces, 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 fllrnace, and if manually operated, must
be equipped with means to prevent operation of either unit
unless the damper is in fifll heat or cool position.

On any job, flexible connections of nonflammable material may
be used Ibr return air and discharge connections to prevent

transmission of vibration. Though these units have t_en spe-
cifically designed _br quiet, vibration free operation, air ducts
can act as sounding boards and could, if poorly installed, am-

plil_¢ the slightest vibration to the annoyance level.
When the filrnace is located in a utility room adjacent to the

living area, the system should be carefiflly designed with
returns to minimize noise transmission through the return
air grille. Although these filrnaces are designed with large

blowers operating at moderate speeds, any blower moving a
high w)lume 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 fllrnace is installed so that the supply ducts carry
air circulated by the furnace to areas outside the space

containing the fllrnace, 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 fur-

nace to a location outside the utility room, basement,
attic, or crawl space.

Do Not install return air through the back of the Iumace
cabinet

Do Not install return air through the side of the filrnace
cabinet on horizontal applications.

NOTE:
Minimum return air temperature is 50 ° F.

CONFINED SPACE
AIR FROM VENTILATED ATTIC

CONFINED-
SPACE

INLET
AIR DUCT

8 18-CD19D6-27

:LOUVERS

TO OUTDOORS

All return air duct systems should provide fl)r installation of
return air filters.

1. Set the fllrnace 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 Ior
return air, refer m Figure 10 and the outline drawing on

page 4 lbr 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 I side and the
bottom; OR just the bottom.

4. If a 3/4" flange is to be used lot attaching the air inlet
duct, add to cut where indicated by dotted lines in

Figure 10. Cut corners diagonally anti bend outward to

form flange.

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

6. The bottom panel of the upflow fllrnace must be removed
lot bottom return air. Lay the fllrnace 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 lbrward to remove the channel.
The bottom return air panel will now easily slide out of
the cabinet. Reinstall the bottom front channel fl)r upflow

bottom return installations.

7. Use the filter retainer on side or bottom if filter is to be
used within the fllrnace cabinet on upflow only installa-

tions.

8. The horizontal installation of the uptlow furnace

requires an external filter section. Filter kits are
available for horizontal applications.

9. Connect duct work to fllrnace. See Outline Drawing lor
supply and return duct size and location. Flexible duct
connectors are recommended to connect both supply and

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

Installer's Guide

UPFLOW FURNACE ONLY

LOCATING *'_ ",.. I
NOTCHES PRO- _ I/

VlDED FOR SIDE I _"

RETURN CUTOUT; _ _"'/1

i //"_

/

_,"_-.._"_. I

/ FRONT

*SEE OUTLINE DRAWING

The filter rack itself slides to adjust to the required width
needed lot bottom or side return (See Figure 12).

OPTIONAL BOTTOM FILTER RACK INSTALLATION

With the filter removed, the filter rack is compressed ant]
then inserted into the bottom of the furnace. The retaining
screw/pin on each sitie inserts into engagement holes at the

bottom of the furnace cabinet sitie.

I

CUT OUT

FOR SIDE

of Furnace

RETURN AIR FILTERS
(Filters not supplied with unit)

TYPICAL UPFLOW RETURN AIR FILTER INSTALLATIONS

These furnaces require high velocity type air filters. The

filters may be located within the furnace blower compartment
lbr UPFLOW furnaces in either a BOTTOM or SIDE (left side
or right side) return air inlet.

TABLE 3

MODELS CABINET RLTER

NUMBERS WIDTH QTY&SIZE

*UX1B040A9241A

*UX1B060A9361A 17-1/2" 1 - 17" X 25" X 1"
*UX1B080A9421A

*UX1C080A9601A
*UX1C100A9481A

*UX1D100A9601A
*UX1D120A9601A

*Firstlettermaybe"A"or"T"
***NOTE-On5tonairflowmodels,iftheairflowrequirement

exceeds1800CFM,thesemodelswillrequirefilterson bothsides;
OR1sideandthebottom;ORjustthebottom.

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 I side and the
bottom; OR just the bottom.

21" 1-20" X25" X 1"

24-1/2" 1 - 24" X25" X 1"

Blower Door Hinge and Bottom Filter Rack Installation

@

FILTER

RACK -_

RAILS

The upflow fllrnace blower door has a hinge at the bottom
which allows the door to tilt lorward fl)r filter replacement
without the door being removed (See Figure 11). The optional

fllrnace filter in the bottom or side configuration can be
removed by simply turning the two latches on the blower door
ant] tilting the door lbrward.

The filter rails are spring loaded fl)r automatic adjustment to

allow standard size, locally obtainable replacement filters.

18-CD19D6-27 9

AUTOMATIC

ADJUSTMENT

Optional Filter Rack Accessory Kit

RETAINING

(Both Sides)

BA YRACK960A

PIN

Installer's Guide

®

iiiiiiiiiiii

ENGAGEMENT

HOLE DETAIL

(Typical both sides
and blower deck)

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

NOTE:

The optional filter rack installation is not allowed for right

side return on the following model: *UXI COSOA9601.

If side air return is desired, the following instructions should

be used:

a.

Open or remove the blower door.

b.

Leave the bottom panel in place.

C.

Alter the side cutout is made lbllowing the directions

in the "Return Air Duct Connections" section on
pages 8 and 9, compress the optional filter rack and

reinstall in the side of 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 14 -

18.

d. Install the optional fllrnace filter on the side inserting

the chamler end first.

®

Furnace

Cabinet

Side

Engagement Hole

For Filter Rack

Installation With

Bottom Return

®

BLOWER
DECK

Furnace

Cabinet =,,,_

Side

SIDE

CUTOUT

RETAINING

(B°PIN "_

BOTTOM ENGAGEMENT

Filter Rack
Retaining

Screw/Pin

t

Bottom Panel

Engagement Hole Furnace
For Filter Rack Blower

Installation With
Side Return Deck

N Filter

Retain ing Rack

Screw/Pin Assembly

\

Filter
Rack

®

Cabinet

Furnace / Rack

Side

Engagement Hole
For Filter Rack

Installation With

Bottom Return

10 18-CD19D6-27

Filter

Filter Rack
Retaining

Screw/Pin

Iti /// FILTER

BOTTOM

PANEL

INSTALLED

Typical Upflow Left Side Return Filter Rack Installation