Lennox CBA25UH Installation Instructions Manual

INSTALLATION

©2017 Lennox Industries Inc.
Dallas, Texas, USA

THIS MANUAL MUST BE LEFT WITH THE

HOMEOWNER FOR FUTURE REFERENCE

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

Merit® Series
CBA25UH Air Handler Units

MULTI-POSITION AIR HANDLERS
507751-01
12/2017

Table of Contents

Shipping and Packing List .............................................1

CBA25UH Unit Dimensions – Upow – Inches (mm) ..... 2

General Information ....................................................... 3

Requirements ................................................................3

Installation Clearances ..................................................4

Installation .....................................................................4

Condensate Drain...........................................................7

Duct System and Filters ...............................................8

Brazing Refrigerant Lines .............................................. 9

Sealing the Unit ...........................................................12

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

Air Flow – Cooling Blower Speed ................................ 15

Check-out Procedures ................................................. 16

Operation .................................................................... 17

Homeowner Maintenance ............................................17

Repairing or Replacing Cabinet Insulation .................. 18

Professional Maintenance ...........................................18

Use of Air Handler During Construction .......................18

Shipping and Packing List

Package 1 of 1 contains:

1 – Assembled air handler unit factory-equipped for upow

or horizontal air discharge application (includes upow

and horizontal drain pans and preinstalled air lter).

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

plate to conrm that delivered unit matches order.

IMPORTANT: Special procedures are required for clean­ing the all-aluminum coil in this unit. See page 18 in this
instruction for information.

IMPORTANT INFORMATION FOR INSTALLER

This unit has a delay relay that delays the supply blower “ON” for 1 second and keeps the blower “ON” for 45

seconds on all fan and cooling demands. For more details, refer to page 17 for unit sequence of operation.

1

1

SECOND

DELAY

34

100%

2

CFM

COOLING

DEMAND

Page 1

100%

CFM

45

SECS

OFF

CBA25UH Unit Dimensions – Upow – Inches (mm)

(Top and Left Side)

8

1 (25)

DETAIL OF PIPING PLATE

1 (25)

LINE VOLTAGE

INLETS

3/4

(19)

14-1/2

(368)

TOP VIEW

CIRCUIT

BREAKER

COVER

SUPPLY AIR

OPENING

C

B

1 (25)

LOW VOLTAGE

INLETS

(Top and Right Side)

2-3/8

(60)

4-3/8
(111)

LINE VOLTAGE

INLETS

(Top and Right Side)

LOW VOLTAGE

INLETS

(Either Side)

3/4 (19)

SUCTION

LINE

LIQUID

LINE

2-3/4

(70)

1-3/4

(44)

4-3/4

(121)

CONDENSATE

DRAINS (2)
(Horizontal)

CONDENSATE

DRAINS (2)
(Upflow and

Downflow)

3-1/2

(89)

22

(559)

A

1-1/8

(29)

AIR FLOW

PIPING

PLATE

D

OPENING

CONDENSATE DRAIN

PIPING PLATE (3)

(2-1/4 x 3-3/4)

FILTER
ACCESS

1-1/8

(29)

SUCTION

LINE

LIQUID

LINE

1/2

(13)

20-3/8

(518)

OPENING

FRONT VIEW SIDE VIEW

1-1/

(29)

Page 2

General Information

The CBA25UH series air handler with all-aluminum
coil is designed for indoor installation only. As shipped,

the unit is ready for installation in either upow, horizontal

left-hand or right-hand air discharge applications. Electric
heat, downow air discharge kits, air lters and other ac­cessories are available and listed in the CBA25UH Prod-
uct Specication bulletin for ordering.

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.

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.

Requirements

Local authorities having jurisdiction should be consulted
before installation is made. Such applicable regulations or
requirements take precedence over the general instruc­tions in this manual.

Install the conditioned air plenum, ducts and air lters

(provided) in accordance with NFPA 90B Standard for the
Installation of Warm Air Heating and Air-Conditioning Sys­tems (latest edition).

The air handler is shipped from the factory completely as­sembled. The unit is provided with anges for the connec­tion of the duct system.

Do not remove the cabinet knockouts until it has been de­termined which knockouts will need to be removed for the
installation.

Select the air discharge position which best suits the site
conditions. Consider required clearances, space, routing
requirements for refrigerant line, condensate disposal,

lters, duct system, wiring, and accessibility for service.
Refer to the rating plate on the air handler for specic in-

formation.

WARNING

Excessive Weight Hazard - Use two or more people
when moving and installing the unit. Failure to do so can
result in back or other type of injury.

IMPORTANT

CBA25UH units include a factory-installed check/
expansion valve which will provide optimal refrigerant
control and system performance with outdoor units of
varying capacities. These units must be installed as a
part of a matched system as outlined in the CBA25UH

Product Specication bulletin.

These instructions are intended as a general guide and do
not supersede local or national codes in any way. Consult
authorities having jurisdiction before installation.

Compliance with all local, state, or national codes pertain­ing to this type of equipment should be determined prior
to installation. Read this instruction manual, as well as the
instructions supplied in separate equipment, before start­ing the installation.

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), MUST conform with National Fire Protection As­sociation (NFPA) standards: “Standard for Installation of
Air Conditioning and Ventilation Systems” (NFPA No. 90A)
and “Standard for Installation of Residence Type Warm Air
Heating and Air Conditioning Systems” (NFPA No. 90B).

All models are designed for indoor installation only. The

installation of the air handler, eld wiring, duct system, etc.

must conform to the requirements of the National Electri­cal Code, ANSI/NFPA No. 70 (latest edition) in the United
States, and any state laws, and local ordinances (includ­ing plumbing or waste water codes).

WARNING

Danger of explosion. Keep ammable

materials and vapors, such as gasoline, away
from air handler. Place air handler so that
heating elements are at least 18 inches (46

cm) above the oor for a garage installation.

Failure to follow these instructions can result

in death, explosion, or re.

IMPORTANT

Excessive condensation may occur if the unit is installed
in a warm, humid place. When the unit is installed in
an unconditioned space, apply sealant around electrical
wires, refrigerant piping and condensate lines at the
point where they enter the cabinet.

Apply sealant on the inside of the cabinet at the
point where the electrical wires exit through the
conduit opening. This will also keep warm and moist
unconditioned air out of the air handler cabinet where
it will form condensate on the cooler control box and
electrical controls.

IMPORTANT

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.

The air handler must be installed so that free access is

allowed to the coil/lter compartment and blower/control

compartment.

Page 3

NOTES –

During cooling operation, excessive sweating may occur
if the air handler is installed in a warm and humid space.

If installed in an unconditioned space, sealant should be
applied around the electrical wires, refrigerant tubing, and
condensate lines where they enter the cabinet.

Electrical wires should be sealed on the inside where they
exit the conduit opening. Sealant is required to prevent air
leakage into, and condensate from forming inside of, the
air handler, the control box, and on the electrical controls.

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.

The air handler must be installed so that free access is
allowed to the coil/lter compartment and blower/control
compartment.

Installation Clearances

NON-DUCTED RETURN CLOSET INSTALLATION

The air handler can be installed in a closet with a false
bottom to form a return air plenum. It may also be installed
with a return air plenum under the air handler.

Louvers or return air grilles are eld-supplied. Local codes

may limit application of systems without a ducted return to
single-story buildings.

When a CBA25UH unit is installed in a closet with a lou­vered return opening, the minimum open area for the lou­vers will be:

• 320 square inches for -018 and -024 models;

• 360 square inches for -030 and -036 models;

• 450 square inches for -042 thru -060 models

If the free area is not known, assume a 25% free area for
wood or a 75% free area for metal louvers or grilles. Using
the louver dimensions and the 25% or 75% assumption,
determine if the open area meets the minimum open area
listed above.

If a return air plenum is used, the return air grille should be
immediately in front of the opening in the plenum to allow

for the free ow of return air. When not installed in front of

the opening, there must be adequate clearance around

the air handler to allow for the free ow of return air.

Installation

Each unit consists of a blower assembly, refrigerant coil,
and controls in an insulated galvanized steel factory-n­ished enclosure. Knockouts are provided for electrical wir­ing entrance.

For ease in installation, it is best to make any necessary

coil conguration changes before setting air handler in

place.

REFRIGERANT METERING DEVICE

CBA25UH units are equipped with a factory-installed
check/ expansion valve.

UPFLOW APPLICATION

1 - The air handler must be supported on the bottom

only and set on solid oor or eld-supplied support
frame. Securely attach the air handler to the oor or

support frame.

2 - If installing a unit in an upow application, remove

the horizontal drain pan. IMPORTANT - The

horizontal drain pan is not required in upow

air discharge installations; its removal provides

the best efciency and air ow.

3 - Place the unit in the desired location and slope unit.

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

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

stand that is at least 14" from the oor. This will

allow proper air return.

HORIZONTAL DRAIN PAN
(MUST BE REMOVED)

UP-FLOW /
DOWN-FLOW
DRAIN PAN

FIGURE 1. Upow Conguration

HORIZONTAL APPLICATIONS

IMPORTANT

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

NOTE - When the unit is installed in horizontal applica­tions, a secondary drain pan is recommended. Refer to
local codes.

NOTE - This unit may be installed in left-hand or right­hand air discharge horizontal applications. Adequate sup­port must be provided to ensure cabinet integrity. Ensure
that there is adequate room to remove service and access
panels if installing in the horizontal position.

Page 4

RIGHT-HAND DISCHARGE

FRONT WEIV DNEWEIV

ANGLE IRON OR SHEET

E

RE

1 - Determine which plugs are required for drain line

connections.

2 - With access door removed, remove drain line plugs

to install drain lines.

3 - Set unit so that it is sloped toward the upow drain

pan end of the unit and level from front to back of

unit (see gure 7).

4 - The horizontal conguration is shown in gure 2.

AIR FLOW

Drains

RIGHT‐HAND DRAINS

PLUGS

FIGURE 2. Right-Hand Discharge Conguration

5 - 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 inch to avoid damaging

the coil or lter. See gure 3. Use sheet metal

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

METAL

MAXIMUM 1/2"
LONG SCREW

ANCE 4 IN. (102 MM)

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.

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.

TOP CAP ROTATED TO
CORRECT POSITION

TOP CAP SCREWS

DRAIN PAN

SHIPPING

LOCATION

CABINET

SUPPORT

DRAIN PAN

INSTALLED

HERE

DRIP

SHIELD

90º

BEND

LEFT-HAND AIR DISCHARGE

For horizontal left-hand air discharge, the following eld
modications are required.

1 - Remove access panels and the horizontal drip

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

3 - Remove the drain plugs from back drain holes on

AIR FLOW

FIGURE 3. Suspending Horizontal Unit

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

horizontal drain pan.

horizontal drain pan and reinstall them on front holes.

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

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.

Page 5

HORIZONTAL DRIP SHIELD (-060 MODEL)

DOWN-FLOW RAIL FRONT EDGE OF HORIZONTAL

DRAIN PAN

FIGURE 5. Left-Hand Discharge Conguration

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.

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

front edge of the horizontal drain pan as illustrated

in gure 5.

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. 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.

IMPORTANT

If electric heat section with circuit breakers (ECB29/

ECB31) is installed in a CBA25UH unit in a downow

application, the circuit breakers must be rotated 180°
to the UP position. See ECB29/ECB31 installation
instructions for more details.

Page 6

Condensate Drain

PIPE NIPPLE PROVIDED IN BAG ASSEMBLY - SCH 80, 3/4” I. D. X 5” - 34K7401 (1): CUT THE PIPE IN HALF AND USE IT TO ROUTE THE MAIN DRAIN.

THIS CORNER SHOULD BE 5/8" (+/- 1/8") HIGHER

IMPORTANT

On units of this type, where the blower “draws” rather than “blows” air through the coil, traps must be installed in the
condensate drain lines (primary and auxiliary, if used). Traps prevent the blower from drawing air through the drain lines
into the air supply.

ABOVE

FINISHED

SPACE?

YES

NOTE — WHEN A AIR HANDLER IS LOCATED

ABOVE A FINISHED SPACE THE SECONDARY
DRAIN PA N MUST HAVE A LARGER FOOTPRINT
THAN THE AIR HANDLER.

SECONDARY

DRAIN PAN

WHEN A COIL IS LOCATED ABOVE A FINISHED SPACE, A
3/4” (19.1MM) SECONDARY DRAIN LINE MUST BE:

CONNECTED TO SECONDARY DRAIN PAN

OR

CONNECTED TO THE OVERFLOW DRAIN OUTLET OF
THE AIR HANDLER DRAIN PAN.

TRAPS MUST BE DEEP ENOUGH TO OFFSET MAXIMUM STATIC DIFFERENCES —
GENERALLY, TWO INCHES (51MM).

1

LENNOX P-TRAP 49P66 REQUIRES A LARGER INSTALLATION SPACE THAN THE J-TRAP 91P90.

2

ALWAYS RUN AN OVERFLOW DRAIN LINE. IF NOT POSSIBLE TO
ROUTE OVERFLOW DRAIN LINE, INSTALL LOW VOLTAGE
OVERFLOW SWITCH KIT. WIRE KIT TO SHUT DOWN
COMPRESSOR PER INSTRUCTIONS.

LENNOX #

COMPACT OVERFLOW SWITCH WITH 3/4” FEMALE SLIP INLET

NO

AND MALE ADAPTER, TWO PART DESIGN FOR USE WHERE
OBSTRUCTIONS PREVENT DIRECT THREADING

AIR HANDLER DRAIN PA N

OVERFLOW

DRAIN

OVERFLOW DRAIN LINE

X3169

MAIN

DRAIN

MAIN

DRAIN

CUT TO

REQUIRED

LENGTH

PROVIDED

PIPE NIPPLE

SIDE VIEW

2

VENT MUST EXTEND

ABOVE HEIGHT OF

COIL DRAIN PAN BY

TWO INCHES (51MM)

CLEAN OUT

PRESS IN

(DO NOT GLUE)

1” X 3/4” X 3/4”

REDUCING

TEE WITH

PLUG

1

P-TRAP

LENNOX

49P66, J-TRAP #

91P90 OR ANY

PVC SCH 40 P- OR

J-TRAP 3/4”

FOR NEGATIVE PRESSURE COILS (BLOWER
AFTER COIL) TRAPS ARE REQUIRED ON ALL
DRAIN LINES CONNECTED TO COIL.

VENT

2”

(51MM)

TRAP DEPTH

TO APPROVED

DRAIN

DRAIN LINE SHOULD
SLOPE A MINIMUM OF
ONE INCH PER 10
FEET (25MM PER 3
METERS)

FIGURE 6. Typical Main and Overow Drain

IMPORTANT

THAN DRAIN CORNER

A eld-fabricated secondary drain pan, with a drain pipe

to the outside of the building, is required in all installations

over a nished living space or in any area that may be
damaged by overow from the main drain pan. In some

localities, local codes may require a secondary drain
pan for any horizontal installation.

SLOPING THE UNIT

Make sure the unit is sloped (similar to the slope shown in
gure 7) so that the drain pan will empty completely with-

DRAIN CORNER

out water standing in the pan.

FIGURE 7. Sloping the Unit for Proper Drainage

Page 7

LEVEL PLANE

INSTALL CONDENSATE DRAIN

ALL CBA25UH MODELS

DRAIN PLUG

DRAIN PLUG

The air handler is provided with 3/4" NPT condensate
drain connections.

IMPORTANT

On some pans, the primary and secondary drain holes
have knockouts.

Conrm primary and secondary drains are open.

1 - CBA25UH units are equipped with a drain pan, which

includes green (main drain) and red (secondary
drain) plugs. Unscrew the plugs to remove them

before inserting condensate drain ttings.

UNSCREW PLUGS

AND CONNECT
PROPERLY SIZED
FIELD-PROVIDED

FITTINGS AND

DRAIN LINES.

DRAIN PAN

GREEN MAIN

FIGURE 8. Drain Line Connections

2 - Install properly sized, eld-provided connection

ttings and connect primary drain line to the main

drain pan connection.

NOTE - When installing drain line connection ttings to
the drain pan, hand tighten the tting and use a thread
sealant. Over-tightening the ttings can split connections
on the drain pan.

3 - If the secondary drain line is to be used, remove the

plug or the knockout and route the drain line so that
water draining from the outlet will be easily noticed
by the homeowner. Refer to local codes for drain
trap requirements on the secondary drain line.

4 - Check again to ensure drain ports and drain pan

are free of all debris.

5 - Plug and check any unused drain pan openings for

tightness. Torque plugs to 30 in. lb. to prevent water
leaks or seepage from the drain pan.

6 - Install a 2" trap in the main (primary) drain lines as

close to the unit as practical (see gure 6). Make

sure the top of the trap is below the connection to
the drain pan to allow complete drainage of the pan.

NOTE - Horizontal runs must have an anti-siphon air vent
(standpipe) installed ahead of the horizontal run. See g­ure 6. An extremely long horizontal run may require an
oversized drain line to eliminate air traps.

NOTE - Do not operate air handler without a trap in the
main (primary) drain. The condensate drain is on the
negative pressure side of the blower; therefore, air being
pulled through the condensate line will not allow positive
drainage without a proper trap.

7 - Route the drain line to the outside or to an

appropriate drain. Drain lines must be installed so
they do not block service access to the front of the

air handler. A 24" clearance is required for lter, coil,

or blower removal and service access.

RED SECONDARY

NOTE - Check local codes before connecting the drain
line to an existing drainage system. Insulate the drain
lines where sweating could cause water damage.

TEST CONDENSATE DRAIN

Test the drain pan and drain line after installation:

1 - Pour several quarts of water into drain pan. Use

enough water to ll both the drain trap and the line.

2 - Check the installed drain pan. Drain pan must be

draining completely. Drain line ttings must not be

leaking. Water must be draining from the end of the
primary drain line.

3 - Correct any leaks found.

Duct System and Filters

DUCT SYSTEM

The air handler is provided with anges for the connection

of the supply plenum.
Supply and return duct system must be adequately sized

to meet the system’s air requirements and static pressure
capabilities. The duct system should be insulated with a
minimum of 1" thick insulation with a vapor barrier in con­ditioned areas or 2" minimum in unconditioned areas.

Supply plenum should be the same size as the anged

opening provided around the blower outlet and should ex­tend at least 3 ft. from the air handler before turning or
branching off plenum into duct runs. The plenum forms an
extension of the blower housing and minimizes air expan­sion losses from the blower.

FILTERS

A lter is provided. Table 1 lists the lter size for each unit.

TABLE 1. Unit Air Filter Size Chart

CBA25UH Filter Size – In.

-018, -024, -030 15" x 20" x 1"

-036, -042, -048, -060 18" x 20" x 1"

IMPORTANT

If a high efciency lter is being installed as part of this
system to ensure better indoor air quality, the lter must
be properly sized. High efciency lters have a higher
static pressure drop than standard efciency glass/foam
lters. If the pressure drop is too great, system capacity

and performance may be reduced. The pressure drop
may also cause the limit to trip more frequently during
the winter and the indoor coil to freeze in the summer,
resulting in an increase in the number of service

calls. Before using any lter with this system, check
the specications provided by the lter manufacturer

against the data given in the appropriate Lennox Product

Specications bulletin. Additional information is provided

in Service and Application Note ACC002 (August 2000)..

Page 8

INSTALLING DUCT SYSTEM

Cabinet and Duct Flange

Connect supply air duct to the ange on top of the air han­dler. If an isolation connector is used, it must be nonam-

mable.

FIELD-FABRICATED RETURN AIR DUCT FLANGE

FOR HORIZONTAL APPLICATIONS

A return air duct system is recommended, but not facto-

ry-provided. If the unit is installed in a conned space or

closet, run a full-size return connection to a location out­side the closet.

CABINET
DOOR FLANGE

1−1/2

(38)

WARNING

Polyol ester (POE) oils used with HFC-410A refrigerant
absorb moisture very quickly. It is very important that the
refrigerant system be kept closed as much as possible.
DO NOT remove line set caps or service valve stub caps
until you are ready to make connections.

WARNING

Danger of re. Bleeding the refrigerant

charge from only the high side may result
in pressurization of the low side shell and
suction tubing. Application of a brazing torch
to a pressurized system may result in ignition
of the refrigerant and oil mixture. Check the
high and low pressures before applying heat.

DUCT
FLANGE

3/4

(19)

1−1/2(38)

3/4

(19)

”A”

BRAKE DOWN 90 DEGREES

1/2

(13)

UNIT SIZE

-018, -024,

-030

-036, -042,

-048, -060

3/4

(19)

1/4 (6) DIA.

2−HOLES

"A"

18-3/8"

21-1/2"

BOTTOM OF
CABINET

DUCT
ADAPTER

3/4

(19)

1−1/2

(38)

FIGURE 9. Cabinet and Duct Flange

Brazing Refrigerant Lines

Refrigerant lines must be connected by a qualied techni­cian in accordance with established procedures.

IMPORTANT

Refrigerant lines must be clean, dry, refrigerant-grade
copper lines. Air handler coils should be installed

only with specied line sizes for approved system

combinations.
Handle the refrigerant lines gently during the installation

process. Sharp bends or kinks in the lines will cause a
restriction.

Do not remove the caps from the lines or system
connection points until connections are ready to be
completed.

WARNING

When using a high pressure gas such as
nitrogen to pressurize a refrigeration or air
conditioning system, use a regulator that can
control the pressure down to 1 or 2 psig (6.9
to 13.8 kPa).

CAUTION

Brazing alloys and ux contain materials which are

hazardous to your health.
Avoid breathing vapors or fumes from brazing operations.

Perform operations only in well-ventilated areas.
Wear gloves and protective goggles or face shield to

protect against burns.
Wash hands with soap and water after handling brazing

alloys and ux.

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.

Page 9

NOTE - When installing refrigerant lines longer than 50
feet, see the Lennox Refrigerant Piping Design and Fab­rication Guidelines, CORP. 9351-L9, or contact Lennox
Technical Support Product Applications for assistance.
To obtain the correct information from Lennox, be sure to
communicate the following information: Model and capac­ity.

1 - Route the suction and liquid lines from the ttings

on the indoor coil to the ttings on the outdoor unit.

Run the lines in a direct path, avoiding unnecessary
turns and bends.

2 - Make sure that the suction line is insulated over the

entire exposed length and that neither suction nor

liquid lines are in direct contact with oors, walls,
duct system, oor joists, or other piping.

3 - To avoid damaging the rubber grommets in the

cabinet while brazing, slide the rubber grommets
over the refrigerant lines until they are away from
the heat source.

NOTE - Place wet rags against piping plate and around
suction line connections.

4 - Connect the suction and liquid lines to the evaporator

coil. Take care to protect the cabinet and internal

components as detailed in gure 10.

5 - Braze using an alloy of silver or copper and

phosphorus with a melting point above 1,100°F
(593°C).

NOTE - Do not use soft solder.

6 - Allow refrigerant pipes to cool to room temperature.

NOTE - Make sure to route copper refrigerant tubing away
from sharp edges and make sure that it does not touch
other metal surfaces. This prevents damage caused by
vibration or metal-on-metal contact.

7 - Reinstall the rubber grommets into the refrigerant

piping panel.

NOTE - Make sure expansion valve capillary tube is not
touching metal edges or copper tubing.

8 - Make sure outdoor unit has been placed according

to the Installation Instructions and is connected to
the refrigerant lines

Page 10

PROCEDURES

PLEASE READ IMPORTANT ISSUES CONCERNING BRAZING

OPERATIONS ON PREVIOUS PAGES BEFORE PROCEEDING.

p

NOTE - REFER TO OUTDOOR UNIT INSTALLATION
INSTRUCTIONS FOR REFRIGERANT PIPING SIZE
REQUIREMENTS.

NOTE - Use silver alloy brazing rods with five or six percent
minimum silver alloy for copper-to-copper brazing, 45

ercent alloy for copper-to-brass and copper-to-steel

brazing.

REMOVE ACCESS PANEL

A

REMOVE RUBBER PLUG FROM BOTH LIQUID

B

AND SUCTION LINES

NOTE - CBA25UH SERIES UNITS USE NITROGEN OR DRY AIR
AS A HOLDING CHARGE. IF THERE IS NO PRESSURE WHEN
THE RUBBER PLUGS ARE REMOVED, CHECK THE COIL FOR
LEAKS BEFORE INSTALLING.

EITHER REMOVE OR PUSH PIPE WRAPPING BACK

C

THROUGH HOLE IN PIPING PLATE BEFORE LINE
SET CONNECTION AND BRAZING.

LOW

HIGH

PIPING
PLATE

CONNECT PIPES

D

NOTE - REFRIGERANT LINE SETS
SHOULD BE ROUTED TO ALLOW
FILTER ACCESSIBILITY.

PLACE A WET RAG AGAINST PIPING

F

PLATE AND AROUND THE SUCTION
LINE CONNECTION.

BRAZE CONNECTION. ALLOW PIPE TO

G

COOL BEFORE REMOVING WET RAG
FROM CTXV SENSING BULB AND PIPING
PANEL AREA.

REPEAT PREVIOUS PROCEDURE FOR LIQUID

H

LINE.

CONNECT GAUGES AND

E

START NITROGEN FLOW

FLOW REGULATED NITROGEN (AT 1 TO 2 PSIG)
THROUGH THE REFRIGERATION GAUGE SET INTO THE
VALVE STEM PORT CONNECTION ON THE OUTDOOR
UNIT LIQUID LINE SERVICE VALVE AND OUT OF THE
VALVE STEM PORT CONNECTION ON THE SUCTION
SERVICE VALVE.

REFER TO INSTRUCTIONS PROVIDED WITH OUTDOOR
UNIT FOR LEAK TESTING, EVACUATING AND CHARGING

NITROGEN

FIGURE 10. Brazing Connections

Page 11

Sealing the Unit

Seal the unit so that warm air is not allowed into the cabi­net. Warm air introduces moisture, which results in water
blow-off problems. This is especially important when the
unit is installed in an unconditioned area.

If installed in an unconditioned space, sealant should be
applied around the electrical wires, refrigerant tubing, and
condensate lines where they enter the cabinet.

WARNING

There must be an airtight seal between the bottom of

the air handler and the return air plenum. Use berglass

sealing strips, caulking, or equivalent sealing method
between the plenum and the air handler cabinet to
ensure a tight seal. Return air must not be drawn from a
room where this air handler or any gas-fueled appliance
(i.e., water heater), or carbon monoxide-producing

device (i.e., wood replace) is installed.

IMPORTANT

Use duct tape and/ or Permagum to seal closed any
space around the holes where the drain lines exit the
cabinet. Warm air must not be allowed to enter through
any gaps or holes in the cabinet.

Electrical Connections

WARNING

Electric Shock Hazard.
Can cause injury or death.
Foil-faced insulation has conductive

characteristics similar to metal. Be sure there

are no electrical connections within 1/2ʺ

of the insulation. If the foil-faced insulation
comes in contact with electrical voltage, the
foil could provide a path for current to pass
through to the outer metal cabinet. While
the current produced may not be enough to
trip existing electrical safety devices (e.g.,
fuses or circuit breakers), the current can be
enough to cause an electrical shock hazard
that could cause personal injury or death.

WARNING

Electric Shock Hazard. Can cause injury or
death. Unit must be properly grounded in
accordance with national and local codes.

Line voltage is present at all components when
unit is not in operation on units with single­pole contactors. Disconnect all remote electric
power supplies before opening access panel.
Unit may have multiple power supplies.

WARNING

Electric shock hazard! - Disconnect all power
supplies before servicing.

Replace all parts and panels before
operating.

Failure to do so can result in death or
electrical shock.

WARNING

Run 24V Class II wiring only through specied low

voltage opening. Run line voltage wiring only through

specied high voltage opening. Do not combine voltage

in one opening.

WARNING

Electric Shock Hazard. Can cause injury or
death. Unit must be properly grounded in
accordance with national and local codes.

Line voltage is present at all components
when unit is not in operation on units with
single-pole contactors. Disconnect all remote
electric power supplies before opening
access panel. Unit may have multiple power
supplies.

• Wiring must conform to the current National Electric
Code ANSI/NFPA No. 70, or Canadian Electric Code
Part I, CSA Standard C22.1, and local building codes.
Refer to following wiring diagrams. See unit nameplate
for minimum circuit ampacity and maximum over-cur­rent protection size.

• Electrical wiring, disconnect means and over-current pro­tection are to be supplied by the installer. Refer to the air
handler rating plate for maximum over-current protection,
minimum circuit ampacity, as well as operating voltage.
Select the proper supply circuit conductors in accordance
with tables 310-16 and 310-17 in the National Electric
Code, ANSI/NFPA No. 70 or tables 1 through 4 in the
Canadian Electric Code, Part I, CSA Standard C22.1.

• The power supply must be sized and protected accord-

ing to the specications supplied on the product.

• This air handler is factory-congured for 240 volt, single
phase, 60 cycles. For 208-volt applications, see “208
Volt Conversion” later in this section.

• Separate openings have been provided for 24V low
voltage and line voltage. Refer to the dimension illustra-

tion of specic location.

• This unit is provided with holes for conduit. Use provid­ed caps to seal holes not used.

• Typical unit wiring (as well as wiring of optional eld-in-

stalled electric heat) is given in gure 14. Refer to the

instructions provided with the electric heat section for
proper installation.

Page 12

WARNING

208 / 240 VOLT TRANSFORMER

USE COPPER CONDUCTORS ONLY

1 - Disconnect all power supplies.

2 - Remove the air handler access panel.

3 - Route the eld supply wires to the air handler

electrical connection box.

4 - Use UL-listed wire nuts to connect the eld supply

conductors to the unit black and yellow leads, and
the ground wire to ground terminal marked GND.

5 - 5. Replace the air handler access panel.

TOP

208 VOLT CONVERSION

1 - Disconnect all power supplies.

2 - Remove the air handler access panel.

3 - Using the wiring diagram located on the unit access

panel as a reference, move the 2 connected black
transformer leads from the 240 volt terminal on
the transformer to the 208 volt terminal on the
transformer.

WARNING

Electrically ground air handler. Connect
ground wire to ground terminal marked
“GND”.

Failure to do so can result in death or
electrical shock.

PRIMARY SECONDARY

240 Volts

208 Volts

SIDE

FIGURE 11. Electrical Connections

(Upow Conguration)

NOTE - To avoid the possibility of moisture damage to the
control in some right-hand discharge congurations, the
control panel can be relocated to the end panel as shown
in gure 12.

TOP

FIGURE 13. Converting Unit from 240VAC to 208VAC

SIDE

FIGURE 12. Control Panel Relocated to End Panel

(Left-Hand Horizontal Conguration)

Page 13

FIGURE 14. Typical Wiring Diagram – CBA25UH Air Handler with Electric Heat

Page 14

AIR HANDLERTHERMOSTAT

NOTE - Connect common wire only if required (Refer to the appropriate thermostat installation instructions).

SEE

NOTE

R

G

BU

Y

AIR

CONDITIONER

UNIT

COOLING‐ONLY APPLICATION

NOTE

THERMOSTAT

SEE

AIR HANDLERTHERMOSTAT

R

G

BU

W

HEAT‐ONLY APPLICATION

AIR HANDLER

R

HEAT PUMP

UNIT

AIR HANDLERTHERMOSTAT

R

CONNECT COMMON

WIRE ONLY IF

REQUIRED

(REFER TO THE

APPROPRIATE

THERMOSTAT

INSTALLATION

INSTRUCTIONS)

SEE

NOTE

G

W

BK

BU

Y

AIR CONDITIONER

UNIT

COOLING APPLICATION WITH

ELECTRIC HEAT

FIGURE 15. Low Voltage Connections (3-Speed PSC Motor) – Field Wiring

Air Flow – Cooling Blower Speed

The cooling blower speed is factory congured to provide
correct air ow for an outdoor unit that matches the cool-

ing capacity rating of the air handler.
If the outdoor unit is smaller than the maximum cooling ca-

pacity rating for the air handler, the cooling blower speed
may need to be changed. Refer to blower performance
chart, table 2 on page 16 .

WARNING

Electric shock hazard! - Disconnect all power
supplies before servicing.

Replace all parts and panels before
operating.

Failure to do so can result in death or
electrical shock.

G

BU

BK

W

HEAT PUMP APPLICATION WITH

ELECTRIC HEAT

CHANGE BLOWER SPEED

1 - Disconnect all power supplies.

2 - Remove the air handler access panel.

3 - Locate pin number 2 on the blower relay. Two

black wires are connected to this terminal pin. One
connects to pin number 5 on the blower relay, one
connects to an in-line splice connecting to a blue
wire.

4 - Select the required blower motor speed. Connect

red-LO or black-HI and plug it into the 4-pin blower
relay harness connector.

NOTE - Reuse the factory-installed wire nut on the un­used wires.

5 - Replace all panels.

6 - Reconnect power.

Page 15

BLOWER RELAY

BLOWER CONNECTOR

NOTE - Refer to wiring diagram located on the
unit
ance (table 2).

All air data measured external to unit with 1
inch non-pleated air filter in place.

All factory settings are medium speed.

All data given while air handler is operating
with a dry DX coil.

All downflow applications run on high speed
when utilizing electric heat.

FIGURE 16. Changing Blower Speed

TABLE 2. CBA25UH Blower Performance (3-Speed PSC) – 240V (CFM @ ESP. – in. W. C.)

Air Handler

Model

-018

-024

-030

-036

-042

-048

-060

Blower Speed .10" WC .20" WC .30" WC .40" WC .50" WC

Low (Red)
Med (Blue)
High (Black)

Low (Red)
Med (Blue)
High (Black)

Low (Red)
Med (Blue)
High (Black)

Low (Red)
Med (Blue)
High (Black)

Low (Red)
Med (Blue)
High (Black)

Low (Red)
Med (Blue)
High (Black)

Low (Red)
Med (Blue)
High (Black)

510
670
905

630
885

1130

900
1075
1240

1075
1300
1510

1325
1490
1820

1775
1995
2070

1675
1965
2140

495
650
865

625
875

1100

865
1060
1210

1040
1250
1450

1315
1465
1770

1710
1895
1970

1630
1925
2085

5

BLOWER RELAY
HARNESS

BLUE (MED)

PLASTIC CAPS

RED (L0)

2

BLACK (HI)

YELLOW (COM)

4-PIN

475
630
820

615
850

1070

830
1030
1170

1000
1205
1390

1300
1440
1690

1645
1800
1850

1580
1875
2000

420
595
770

610
820

1010

780
985

1135

950
1145
1320

1275
1395
1600

1565
1685
1719

1520
1800
1895

325
505
705

580
780
950

740
940

1085

900
1085
1245

1225
1315
1500

1470
1560
1595

1450
1695
1795

• Blower Performance (CFM vs. ESP inches H20)

• Cooling speeds should not be reduced below factory setting.

• All units with electric heat approved at 0.5" maximum and medium blower speed minimum.

• All downow applications run on high speed when utilizing electric heat.

Check-out Procedures

NOTE – Refer to outdoor unit installation instructions for sys­tem start-up instructions and refrigerant charging instructions.

PRE-START-UP CHECKS

• Is the air handler properly and securely installed?

• If horizontally congured, is the unit sloped up to 5/8
inch toward drain lines?

• Will the unit be accessible for servicing?

• Has an auxiliary pan been provided under the unit with

separate drain for units installed above a nished ceil­ing or in any installation where condensate overow

could cause damage?

• Have ALL unused drain pan ports been properly
plugged?

• Has the condensate line been properly sized, run,
trapped, pitched, and tested?

• Is the duct system correctly sized, run, sealed, and in­sulated?

• Have all cabinet openings and wiring been sealed?

• Is the indoor coil factory-installed TXV properly sized for
the outdoor unit being used?

• Have all unused parts and packaging been disposed
of?

• Is the lter clean, in place, and of adequate size?

Page 16

• Is the wiring neat, correct, and in accordance with the

SECS

34

wiring diagram?

• Is the unit properly grounded and protected (fused)?

• Is the thermostat correctly wired and in a good location?

• Are all access panels in place and secure?

CHECK BLOWER OPERATION

• Set thermostat to FAN ON.

• The indoor blower should come on.

CHECK COOLING OPERATION

• Set thermostat to force a call for cooling (approximately
5ºF lower than the indoor ambient temperature).

• The outdoor unit should come on immediately and the
indoor blower should start between 30 - 60 seconds lat­er.

• Check the air ow from a register to conrm that the
system is moving cooled air.

• Set the thermostat 5ºF higher than the indoor tempera­ture. The indoor blower and outdoor unit should cycle
off.

CHECK ELECTRIC HEAT (IF USED)

• Set thermostat to call for auxiliary heat (approximate­ly 5°F above ambient temperature). The indoor blow­er and auxiliary heat should come on together. Allow a
minimum of 3 minutes for all sequencers to cycle on.

• Set the thermostat so that it does not call for heat. Allow
up to 5 minutes for all sequencers to cycle off.

Operation

TIME DELAY RELAY

Blower time delay operation:

1 - When cooling demand is initiated, there is a 1

second motor-on delay.

2 - After the motor-on delay expires, motor ramps up

to 100% and runs at 100% until cooling demand is

satised.

3 - Once demand is met, motor runs at 100% for 45

seconds.

4 - Motor ramps down to stop.

contactor in the outdoor unit, starting the compressor and
outdoor fan motor.

On heat pumps, circuit R and O energizes the reversing
valve, switching the valve to the cooling position. (The re­versing valve remains energized as long as the thermo­stat selector switch is in the COOL position.)

At the completion of the cooling demand the indoor blower
and outdoor unit should cycle off. Air handler should cycle
off 45 seconds after the outdoor unit shuts off.

HEATING (ELECTRIC HEAT ONLY)

When the thermostat calls for heat, the circuit between R
and W is completed, and the heat sequencer is energized.
A time delay follows before the heating elements and the
indoor blower motor come on. Units with a second heat

sequencer can be connected with the rst sequencer to W

on the thermostat sub-base, or they may also be connect­ed to a second stage on the sub-base.

HEATING (HEAT PUMP)

When the thermostat calls for heating, 24 volts is applied
to the blower time-delay relay coil. Then, normally open
contacts close, causing the indoor blower motor to oper­ate. The circuit between R and Y is completed, closing
the circuit to the contactor in the outdoor unit, starting the
compressor and outdoor fan motor.

If the room temperature continues to decrease, the cir­cuit between R and W1 is completed by the second-stage
heat room thermostat. Circuit R-W1 energizes a heat se­quencer. The completed circuit will energize supplemen­tal electric heat (if applicable). Units with a second heat

sequencer can be connected with the rst sequencer to

W1 on the thermostat. They may also be connected to
a second heating stage W2 on the thermostat sub-base.

EMERGENCY HEAT (HEATING HEAT PUMP)

If the selector switch on the thermostat is set to the emer­gency heat position, the heat pump will be locked out of
the heating circuit, and all heating will be electric heat (if
applicable). A jumper should be placed between W2 and E
on the thermostat sub-base so that the electric heat con-

trol will transfer to the rst-stage heat on the thermostat.

This will allow the indoor blower to cycle on and off with
the electric heat when the fan switch is in the AUTO po­sition.

Homeowner Maintenance

1

1

SECOND

DELAY

100%

2

CFM

COOLING

DEMAND

100%

CFM

45

FIGURE 17. Blower Time Delay

COOLING (COOLING ONLY OR HEAT PUMP)

When the thermostat calls for cooling, 24 volts is put on
the blower time-delay relay coil and then the indoor blow­er relay energizes. The normally open contacts close,
causing the indoor blower motor to operate. The circuit
between R and Y is completed, closing the circuit to the

OFF

IMPORTANT

Do not operate system without a lter. A lter is required

to protect the coil, blower, and internal parts from

excessive dirt and dust. The lter is placed in the return

duct by the installer.

• Inspect air lters at least once a month and replace or

clean as required. Dirty lters are the most common

cause of inadequate heating or cooling performance.

• Replace disposable lters. Cleanable lters can be
cleaned by soaking in mild detergent and rinsing with
cold water.

Page 17

• Install new/clean lters with the arrows on the side point-

ing in the direction of air ow. Do not replace a clean­able (high velocity) lter with a disposable (low velocity)
lter unless return air system is properly sized for it.

• If water should start coming from the secondary drain
line, a problem exists which should be investigated and

corrected. Contact a qualied service technician.

Repairing or Replacing Cabinet Insulation

IMPORTANT

DAMAGED INSULATION MUST BE REPAIRED OR
REPLACED before the unit is put back into operation.
Insulation loses its insulating value when wet, damaged,
separated or torn.

Matte- or foil-faced insulation is installed in indoor equip­ment to provide a barrier between outside air conditions
(surrounding ambient temperature and humidity) and the
varying conditions inside the unit. If the insulation barrier
is damaged (wet, ripped, torn or separated from the cabi­net walls), the surrounding ambient air will affect the inside
surface temperature of the cabinet.

The temperature/humidity difference between the inside
and outside of the cabinet can cause condensation on the
inside or outside of the cabinet which leads to sheet metal
corrosion and, subsequently, component failure.

REPAIRING DAMAGED INSULATION

Areas of condensation on the cabinet surface are an indi­cation that the insulation is in need of repair.

If the insulation in need of repair is otherwise in good con­dition, the insulation should be cut in an X pattern, peeled
open, glued with an appropriate all-purpose glue and
placed back against the cabinet surface, being careful to
not overly compress the insulation so the insulation can
retain its original thickness. If such repair is not possible,
replace the insulation. If using foil-faced insulation, any
cut, tear, or separations in the insulation surface must be
taped with a similar foil-faced tape.

Professional Maintenance

NOTICE !

Failure to follow instructions will cause damage to
the unit.

This unit is equipped with an aluminum coil.
Aluminum coils may be damaged by exposure to
solutions with a pH below 5 or above 9. The alumi­num coil should be cleaned using potable water
at a moderate pressure (less than 50psi). If the
coil cannot be cleaned using water alone, Lennox
recommends use of a coil cleaner with a pH in the
range of 5 to 9. The coil must be rinsed thoroughly
after cleaning.

In coastal areas, the coil should be cleaned with
potable water several times per year to avoid corro­sive buildup (salt).

Use of Air Handler During Construction

Lennox does not recommend the use of its air handler unit
during any phase of construction. Very low return air tem­peratures, harmful vapors and operation of the unit with

clogged or misplaced lters will damage the unit.

Air handler units may be used for heating (heat pumps)
or cooling of buildings under construction, if the following
conditions are met:

• A room thermostat must control the air handler. The use

of xed jumpers is not allowed.

• Air lter must be installed in the system and must be
maintained during construction.

• Air lter must be replaced upon construction comple-
tion.

• The air handler evaporator coil, supply fan assembly
and duct system must be thoroughly cleaned following

nal construction clean-up.

• All air handler operating conditions must be veried ac-
cording to these installation instructions.

GLUE - Make sure there is
full coverage of glue on the
metal or insulation so there
are no areas where air
pockets may form which
can lead to sweating.

1. CUT INSULATION IN X PATTERN

2. APPLY GLUE

3. PRESS GLUED TABS AGAINST CABINET

FIGURE 18. Repairing Insulation

Page 18

Technician’s Name:_______________________Date Start−Up & Performance Check Completed__________

Installing Contractor’s Name_______________________
Installing

Contractor’s Phone_______________________

Job

Installing Date_______________________________

_

Address____________________________________

8

Temperature

1

Duct

System

5

Duct Static

Air Handler Model #__________________________

Thermostat

SUPPLY

AIR

9

Disconnect

Switch

2

Line Voltage

3

Integrated Control

Blower Motor Amps

6

Electric Heat Amps

7

RETURN

AIR

DUCT SYSTEM

1

SUPPLY AIR DUCT

Sealed

Insulated (if necessary)

Registers Open and Unobstructed

RETURN AIR DUCT

Sealed

Filter Installed and Clean

Registers Open and Unobstructed

2

INTEGRATED CONTROL

Jumpers Configured Correctly (if applicable)

Appropriate Links in Place (if applicable)

3

VOLTAGE CHECK

Supply Voltage ___________

Low Voltage _____________

Electrial Connections Tight

4

DRAIN LINE

Leak Free

Filter

TOTAL EXTERNAL STATIC (dry coil)

5

Supply External Static ______ ______

Return External Static ______ ______

Total External Static = ______ ______

6

ELECTRIC HEAT AMPS____________

7

INDOOR BLOWER AMPS___________

INDOOR BLOWER CFM____________

TEMPERATURE DROP (Cooling Mode)

8

Return Duct Temperature ___________

Supply Duct Temperature − ___________

8

TEMPERATURE RISE (Heating Mode)

Return Duct Temperature __________

Supply Duct Temperature − __________

9

THERMOSTAT

Adjusted and Programmed

Operation Explained to Owner

4

Drain Line

dry coil wet coil

Temperature Drop = ___________

Temperature Rise = __________

Explained Operation of System to Homeowner

FIGURE 19. Start-up and Performance Checklist (Upow Conguration)

Page 19

Technician’s Name:_______________________Date Start−Up & Performance Check Completed__________

Installing Contractor’s Name_______________________
Installing

Contractor’s Phone_______________________

Job

Installing Date_______________________________

_

Address____________________________________

Thermostat

9

1

Duct System

2

Integrated

Control

Filter

Air Handler Model #__________________________

Disconnect

Switch

Line Voltage

3

1

Duct System

DUCT SYSTEM

1

SUPPLY AIR DUCT

Sealed

Insulated (if necessary)

Registers Open and Unobstructed

RETURN AIR DUCT

Sealed

Filter Installed and Clean

Registers Open and Unobstructed

2

INTEGRATED CONTROL

Jumpers Configured Correctly (if applicable)

Appropriate Links in Place (if applicable)

3

VOLTAGE CHECK

Supply Voltage ___________

Low Voltage _____________

Electrial Connections Tight

4

DRAIN LINE

Leak Free

RETURN

4

Drain Line

AIR

Duct Static

Electric Heat Amps

6

Blower motor Amps

7

5

8

Temperature

TOTAL EXTERNAL STATIC (dry coil)

5

Supply External Static ______ ______

Return External Static ______ ______

Total External Static = ______ ______

6

ELECTRIC HEAT AMPS____________

7

INDOOR BLOWER AMPS___________

INDOOR BLOWER CFM____________

TEMPERATURE DROP (Cooling Mode)

8

Return Duct Temperature ___________

Supply Duct Temperature − ___________

Temperature Drop = ___________

8

TEMPERATURE RISE (Heating Mode)

Return Duct Temperature __________

Supply Duct Temperature − __________

Temperature Rise = __________

9

THERMOSTAT

Adjusted and Programmed

Operation Explained to Owner

SUPPLY

AIR

dry coil wet coil

Explained Operation of System to Homeowner

FIGURE 20. Start-Up and Performance Checklist (Horizontal Conguration)

Page 20