Lennox CBA27UHE-018, CBA27UHE-024, CBA27UHE-030, CBA27UHE-036, CBA27UHE-048 Installation Instructions Manual

INSTALLATION

©2017 Lennox Industries Inc.
Dallas, Texas, USA

THIS MANUAL MUST BE LEFT WITH THE

HOMEOWNER FOR FUTURE REFERENCE

WARNING

This product contains a chemical known to the State
of California to cause cancer, birth defects, or other
reproductive harm.

WARNING

Improper installation, adjustment, alteration, service
or maintenance can cause property damage, personal
injury or loss of life. Installation and service must be
performed by a licensed professional HVAC installer or
equivalent, service agency, or the gas supplier.

IMPORTANT

The Clean Air Act of 1990 bans the intentional venting of
refrigerant (CFCs, HCFCs and HFCs) as of July 1, 1992.
Approved methods of recovery, recycling or reclaiming
must be followed. Fines and/or incarceration may be
levied for noncompliance.

INSTRUCTIONS

Elite® Series
CBA27UHE Air Handler Units

MULTI-POSITION AIR HANDLERS
507674-01
3/2017

Table of Contents

CBA27UHE Upow and Downow Unit Dimensions ..... 2

CBA27UHE Horizontal Left- and Right-Hand Discharge

Unit Dimensions .............................................................3

General Information ....................................................... 4

Shipping and Packing List .............................................4

Requirements ................................................................4

Installing the Unit ........................................................... 4

Brazing Connections .....................................................6

Installing the Condensate Drain ....................................7

Inspecting and Replacing Filters ...................................8

Sealing the Unit .............................................................8

Measuring Static Pressure ............................................9

Adjusting the Blower Speed ..........................................9

Making Electrical Connections ....................................12

Repairing or Replacing Cabinet Insulation .................. 15

Homeowner Maintenance ............................................15

Check-Out Procedures ................................................ 16

IMPORTANT: Special procedures are required for cleaning the all-aluminum coil in this unit. See page 15 in this instruction
for information.

IMPORTANT INFORMATION FOR INSTALLER

CHECK FOR AND REMOVE THESE ITEMS BEFORE OPERATING UNIT.

TOP CAP SHIPPING

BRACKET (REPLACE

SCREWS IN TOP CAP

BLOWER HOUSING

SUPPORT PAD

HORIZONTAL DRAIN PAN (SEE PAGES 4
AND 6)

REFRIGERANT LINE PLUGS

D

(SEE PAGE 6)

AFTER REMOVAL)

DRIP SHIELD. (USED FOR -060 UNITS HORIZONTAL
APPLICATIONS ONLY.) (SEE PAGE 5.) SHOWN
INSTALLED ON DRAIN PAN IN -060 UNIT.

D

Page 1

CBA27UHE Upow and Downow Unit Dimensions – Inches (mm)

3/4 (19)

11‐1/16 (281)

LINE VOLTAGE

INLETS (TOP

AND LEFT SIDE)

TOP VIEW

FLOW

RETURN AIR

FRONT VIEW

SUPPLY AIR

D

AIR

F

OPENING

LOW VOLTAGE

INLETS (TOP AND

RIGHT SIDE)

5/8 (16)

3/4 (19)

5/8 (16)

G

ELECTRIC HEAT

(FIELD-INSTALLED)

A

H

FILTER ACCESS

UP-FLOW POSITION

OPTIONAL

SUCTION

LINE

LIQUID

LINE

FILTER

2

2‐3/4
(70)

PIPING PLAT E DETAIL

1‐3/4 (44)

4‐3/8 (111)

3‐1/2 (89)

(FOR UP-FLOW AND DOWN-FLOW POSITIONS)

1‐1/8 (29)

(51)

5‐3/8

(137)

CB

FILTER

SUCTION

BLOWER

COIL

RETURN AIR

)52( 1)61( 8/5

SIDE VIEW

E

5/8 (16)

LINE

LIQUID

LINE

OPTIONAL

ELECTRIC HEAT

(FIELD-INSTALLED)

LOW VOLTAGE

(RIGHT SIDE)

LINE VOLTAGE

(LEFT SIDE)

SUCTION LINE

CONDENSATE DRAINS
(2) (HORIZONTAL)

LIQUID LINE

CONDENSATE DRAINS
(2) (UP-FLOW AND
DOWN-FLOW)

C

COIL

BLOWER

SUPPLY

11‐1/16 (281)

AIR

SIDE VIEW

5/8 (16)

5/8 (16)

5/8 (16)

DOWN-FLOW POSITION

5/8 (16)

F

Air Opening

E

1 (25)

TOP VIEW

B

AIR FLOW

SUPPLY AIR

D

FRONT VIEW

5/8 (16)

Return

FILTER ACCESS

H

A

G

5/8 (16)

CBA27UHE Common Dimensions - Inches (mm)

Dim. -018/-024 -030/-036 -042/-048 -060

A

B

C

D

E

F

G

H

49-1/4 (1251) 51 (1295) 58-1/2 (1486) 62‐1/2 (1588)

21-1/4 (540) 21-1/4 (540) 21‐1/4 (540) 21‐1/4 (540)

20-5/8 (524) 22‐5/8 (575) 24-5/8 (625) 24-5/8 (625)

19-3/4 (502) 19-3/4 (502) 19‐3/4 (502) 19‐3/4 (502)

19 (483) 21 (533) 23 (584) 23 (584)

20 (508) 20 (508) 20 (508) 20 (508)

24-5/8 (625) 26‐3/8 (670) 27‐7/8 (708) 27‐7/8 (708)

24-5/8 (625) 24-5/8 (625) 30-5/8 (778) 34‐5/8 (879)

Page 2

CBA27UHE Horizontal Left- and Right-Hand Discharge Unit Dimensions – Inches (mm)

5‐3/8
(137)

CONDENSATE

DRAINS (2)

(UP-FLOW

AND

DOWN-FLOW)

CONDENSATE

DRAINS (2)

(HORIZONTAL)

PIPING PLAT E

DETAIL

5/8 (16)

5/8 (16)

5/8 (16)

5‐3/4

(46)

E

RETURN AIR

OPENING

F

END VIEW

Horizontal Position

(Left‐Hand Air

Discharge)

1‐3/4

(44)

(51)

2

1‐1/2

(38)

1 (25)

FILTER ACCESS

LIQUID

LINE

SUCTION

LINE

1‐1/8

(29)

4‐3/8
(111)

FILTER

Horizontal Position

(Right‐Hand Air

Discharge)

Coil

LIQUID

SUCTION

LINE

LINE

TOP VIEW

A

H

AIR

FLOW

FRONT VIEW

C

BLOWER

BLOWER

OPTIONAL ELECTRIC

HEAT (FIELD-INSTA LLED)

G

Coil

5/8 (16)

B

INLETS (BOTTOM

C

LINE VOLTAGE

INLETS (TOP

AND RIGHT

SIDE)

LOW VOLTAGE

AND RIGHT

SIDE)

FOR DIMENSIONS “A” THROUGH

“H”, SEE CHART ON PAGE 2.

11‐1/16

3/4 (19)

(281)

Supply

4‐3/8
(111)

1‐1/8

(29)

Air

Opening

END VIEW

D

3/4 (19)

3/4 (19)

3/4 (19)

3/4 (19)

LOW VOLTAGE

3/4 (19)

11‐1/16

(281)

Supply

D

Air Opening

LINE VOLTAGE INLETS

(BOTTOM AND LEFT SIDE)

END VIEW

INLETS (TOP AND

LEFT SIDE)

OPTIONAL ELECTRIC

HEAT (FIELD INSTALLED)

5/8 (16)

B

CONDENSATE DRAINS (2)

(HORIZONTA L)

G

Air Flow

FILTER

TOP VIEW

A

FRONT VIEW

SUCTION

LINE

H

1‐3/4

(44)

LIQUID

LINE

5‐3/4
(146)

SUCTION LINE

PIPING PLAT E

DETAIL

FILTER ACCESS

1‐1/2 (38)

LIQUID

LINE

1 (25)

E

Return

Air Opening

END VIEW

(51)

2

5‐3/8
(137)

5/8 (16)

5/8 (16)

F

5/8 (16)

Page 3

CAUTION

As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take
care while handling this equipment and wear gloves and
protective clothing.

General Information

The Elite® CBA27UHE series air handler with all-alumi­num coil is designed for installation with optional eld-in-

stalled electric heat and a matching HFC-410A outdoor
unit.

This instruction is intended as a general guide and does
not supersede local or national codes in any way. Consult
authorities having jurisdiction before installation.

Shipping and Packing List

Package 1 of 1 contains:
1 – Assembled air handler unit

1 – Horizontal drip shield (CBA27UHE-060 only)
1 – Pipe nipple (Sch80, 3/4" I.D. x 5"

1 – Warranty card

NOTE – For downow applications, order kit number

83M57.

Check the air handler for shipping damage; if found, im­mediately contact the last carrier.

Requirements

IMPORTANT

This unit must be matched with an indoor coil as specied

in the Lennox Engineering Handbook. Coils previously

charged with HCFC-22 must be ushed.

In addition to conforming to manufacturer’s installation in­structions and local municipal building codes, installation
of Lennox air handler units (with or without optional elec­tric heat), shall conform with the following National Fire
Protection Association (NFPA) standards:

• NFPA No. 90A - Standard for Installation of Air Condi­tioning and Ventilation Systems

• NFPA No. 90B - Standard for Installation of Residence
Type Warm Air Heating and Air Conditioning Systems

This unit is approved for installation clearance to combus­tible material as stated on the unit rating plate. Accessi­bility and service clearances must take precedence over
combustible material clearances.

To disassemble:

1 - Remove access panels.

2 - Remove both blower and coil assemblies. This will

lighten the cabinet for lifting.

3 - Remove one screw from the left and right posts

inside the unit. Remove one screw from each
side on the back of the unit. Unit sections will now
separate.

To reassemble:

1 - Align cabinet sections together.

2 - Reinstall screws.

3 - Replace blower and coil assemblies.

4 - Replace access panel.

UPFLOW APPLICATION

Use the following procedures to congure the unit for up­ow operations:

1 - Remove access panels.

2 - Remove and discard the horizontal drip shield (-060

model, used only on horizontal applications) and
the corrugated padding between the blower and coil
assembly.

3 - The horizontal drain pan must be removed when

the coil blower is installed in the upow position.

Removing the horizontal drain pain will allow proper

air ow and increased efciency.

4 - After removing the horizontal drain pan, place the

unit in the desired location. Set unit so that it is level.
Connect return and supply air plenums as required

using sheet metal screws as illustrated in gure 1.

5 - Install units that have no return air plenum on a

stand that is at least 14" from the oor to allow for
proper air return. Lennox offers an optional upow

unit stand as listed in table 1.

HORIZONTAL DRAIN PAN
(MUST BE REMOVED)

UP-FLOW /
DOWN-FLOW
DRAIN PAN

Installing the Unit

These units are factory-congured for upow and hori­zontal right-hand discharge installation. For downow or
horizontal left-hand discharge, certain eld modications

are required.

DISASSEMBLE/REASSEMBLE AIR HANDLER UNITS

The air handler units consists of two factory-assembled
sections. It may be necessary to disassemble the sections
when positioning the unit for installation.

FIGURE 1. Upow Conguration

TABLE 1. Optional Side-Return Unit Stand

(Upow Only)

Model Kit Number

All unit sizes 45K32

Page 4

HORIZONTAL RIGHT-HAND DISCHARGE

UP-FLOW / DOWN-FLOW
DRAIN

HORIZONT
PA

FRONT VIEW END VIEW

TOP CAP ROTATED TO

APPLICATION

Use the following procedures to congure the unit for hor­izontal right-hand discharge operations:

NOTE – For horizontal applications, a secondary drain
pan is recommended. Refer to local codes.

1 - Before operating the unit, remove access panels

and the horizontal drip shield (-060 model) and the
corrugated padding between the blower and coil
assembly. Discard the corrugated padding.

2 - Install the horizontal shield on the front edge of the

horizontal drain pan as illustrated in gure 2.

3 - No further adjustment is necessary. Set unit so that

it is sloped 1/4" towards the drain pan end of the
unit.

4 - If the unit is suspended, the entire length of the

cabinet must be supported. If you use a chain or
strap, use a piece of angle iron or sheet metal
attached to the unit (either above or below) to
support the length of the cabinet. Use securing
screws no longer than 1/2" to avoid damaging the

coil or lter as illustrated in gure 3. Use sheet

metal screws to connect the return and supply air
plenums as required.

HORIZONTAL DRIP SHIELD (-060 MODELS)

PAN

1/2" SCREWS MAXIMUM

ANGLE IRON OR

SHEET METAL

ELECTRICAL INLET CLEARANCE 4"
(102 mm)

FIGURE 3. Suspending Horizontal Unit

IMPORTANT

When removing the coil, there is possible danger of
equipment damage and personal injury. Be careful when
removing the coil assembly from a unit installed in right­or left-hand applications. The coil may tip into the drain
pan once it is clear of the cabinet. Support the coil when
removing it.

HORIZONTAL LEFT-HAND DISCHARGE
APPLICATION

NOTE – For horizontal applications, a secondary drain
pan is recommended. Refer to local codes.

CABINET

SUPPORT

DRIP

SHIELD

CORRECT POSITION

TOP CAP SCREWS

N

FIGURE 2. Right-Hand Discharge Conguration

HORIZONTAL RIGHT-HAND DISCHARGE
APPLICATION IN HIGH-HUMIDITY AREAS

For horizontal applications in high humidity areas, remove

the downow rail closest to the drain pan.

To remove rail:

1 - Remove the screws from the rail at the back of unit

and at the cabinet support rail.

2 - Remove the downow rail then replace screws.

3 - Seal around the exiting drain pipe, liquid line, and

suction line to prevent humid air from inltrating into

the unit.

AL DRAIN

NO ADJUSTMENT IS NECESSARY

DOWN-FLOW RAIL

90º

BEND

DRAIN PAN

REINSTALLED

HERE

REINSTALLED HERE REMOVED FROM HERE

COIL SHOWN IN UPLOAD POSITION FOR EASY CONVERSION

TOP
CAP

90º

BEND

———— DRAIN PLUGS ————

ALIGN HOLES WITH
HOLES IN COIL END
PLATE. STARTING WITH
THE ROUND HOLES ON
THIS END.

BACK COIL END SEAL

FIGURE 4. Field Modication for

Left-Hand Discharge

DRAIN PAN

SHIPPING

LOCATION

Page 5

Use the following procedures to congure the unit for hor-

HORIZONTAL DRIP SHIELD (-060 MODEL)

DRAIN PAN

izontal left-hand discharge operations:

1 - Before operating the unit, remove access panels

and the horizontal drip shield (-060 model) and the
corrugated padding between the blower and coil
assembly. Discard the corrugated padding.

2 - Pull the coil assembly from unit. Pull off the

horizontal drain pan.

3 - Remove the drain plugs from back drain holes on

horizontal drain pan and reinstall them on front
holes.

IMPORTANT

After removal of drain pan plug(s), check drain hole(s)
to verify that drain opening is fully open and free of any
debris. Also check to make sure that no debris has fallen
into the drain pan during installation that may plug up the
drain opening.

4 - Rotate drain pan 180º front-to-back and install it on

the opposite side of the coil.

5 - Remove screws from top cap. Remove horizontal

drip shield screw located in the center of the back

coil end seal as illustrated in gure 4 on page 5.

6 - Rotate horizontal drip shield 180º front-to-back.

7 - Remove plastic plug from left hole on coil front

end seal and reinstall plug in back hole. Reinstall
horizontal drip shield screw in front coil end seal.
Drip shield should drain downward into horizontal
drain pan inside coil.

10 - Install the horizontal shield (-060 model) on the

front edge of the horizontal drain pan as illustrated

in gure 5 on page 6.

NOTE – For horizontal applications in high humidity ar-
eas, remove the downow rail closest to the drain pan. To
remove rail, remove screw from rail at back of unit and at
cabinet support rail. Remove downow rail then replace
screws. Also, seal around the exiting drain pipe, liquid and
suction lines to prevent inltration of humid air.

11 - Knock out drain seal plate from access door. Secure

plate to cabinet front ange with screw provided.

12 - Flip access door and replace it on the unit.

13 - Set unit so that it is sloped 1/4ʺ toward the drain

pan end of the unit. Connect return and supply air
plenums as required using sheet metal screws.

14 - If suspending the unit, it must be supported along the

entire length of the cabinet. If using chain or strap,
use a piece of angle iron or sheet metal attached
to the unit (either above or below) so that the full
length of the cabinet is supported. Use securing

screws no longer than 1/2ʺ to avoid damage to coil
or lter, as illustrated in gure 3 on page 5. Connect

return and supply air plenums as required using
sheet metal screws.

DOWNFLOW APPLICATION

NOTE – If downow application is required, separately
order kit number 83M57 and install per kit’s instructions.
Also use metal or class I supply and return air plenums.

Use the installation instruction provided with the downow
kit.

DOWN-FLOW RAIL FRONT EDGE OF HORIZONTAL

FIGURE 5. Left-Hand Discharge Conguration

8 - Rotate top cap 180º front-to-back and align with

unused screw holes. Holes must align with front and
back coil end plates. The top cap has a 45º bend on
one side and a 90º bend on the other. The 90º bend

must be on the same side as the horizontal drain

pan as illustrated in gure 4 on page 5.

NOTE – Be very careful when reinstalling the screws into
the coil end plate engaging holes. Misaligned screws may
damage the coil.

9 - From the upow position, ip cabinet 90º to the

left and set into place. Replace blower assembly.
Secure coil in place by bending down the tab on the

cabinet support rail as illustrated in gures 4 and 5.

IMPORTANT

If electric heat section with circuit breakers (ECB29) is

installed in a CBA27UHE unit in a downow application,

the circuit breakers must be rotated 180° to the UP
position. See ECB29 installation instructions for more
details.

Brazing Connections

IMPORTANT

To prevent the build-up of high levels of nitrogen when
purging, it must be done in a well-ventilated area. Purge
low-pressure nitrogen (1 to 2 psig) through the refrigerant
piping during brazing. This will help to prevent oxidation
and the introduction of moisture into the system.

All coils are equipped with a factory-installed, internally
mounted check/expansion valve.

The air handler’s coil line sizes are listed in table 2. Use
Lennox L15 (sweat) series line sets (refer to the outdoor

unit Product Specications (EHB) for proper size, type
and application). For eld-fabricated refrigerant lines, see

the piping section of the Lennox Unit Information Service
Manual.

Page 6