Lennox BCE3MC, BCS3MC Installation Instructions Manual
INSTALLATION INSTRUCTIONS
BCE3M*C & BCS3M*C SERIES AIR HANDLER
These instructions must be read and understood completely before attempting installation.
This is a safety alert symbol and should never be ignored. When you see this symbol on labels or in
manuals, be alert to the potential for personal injury or death.
Table of Contents
Unit Dimensions ..........................................................2
Shipping and Packing List ...........................................3
General ........................................................................3
Requirements ..............................................................3
Installation Clearances ................................................4
Installation ...................................................................4
Condensate Drain........................................................8
Duct System and Filters ............................................10
Brazing Refrigerant Lines .......................................... 11
Sealing the Unit .........................................................13
Electrical Connections ...............................................13
Air Flow — Cooling Blower Speed ............................17
Check-Out Procedures ..............................................19
Operation ...................................................................19
Maintenance ..............................................................20
Cabinet Insulation ......................................................20
Use of Air Handler During Construction.....................21
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 installer (or
equivalent), service agency or the gas supplier.
215 Metropolitan Drive
West Columbia, SC 29170
507621-01 Issue 1720 Page 1 of 23
WARNING
This product contains a chemical known to the State
of California to cause cancer, birth defects or other
reproductive harm.
CAUTION
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.
*P507621-01*
(P) 507621-01
FRONT VIEW SIDE VIEW
1 (25)
Unit Dimensions
SUPPLY AIR
OPENING
E
1 (25)
LINE VOLTAGE
INLETS
(Top and Left Side)
3-5/8
(92)
5 (102)
F
TOP VIEW
CIRCUIT
BREAKER
COVER
AIR FLOW
G
D
SUCTION
LINE
LIQUID
LINE
1 (25)
LOW VOLTAGE
INLETS
(Top and Right Side)
3/4 (19)
LINE VOLTAGE INLETS
A
CONDENSATE DRAIN
PIPING PLATE (4)
(2-1/4 x 3-3/4)
FILTER ACCESS
(Top and Right Side)
LOW VOLTAGE INLETS
(Either Side)
CB
1/2
(13)
JH
Dimension
1-1/8
(29)
OPENING OPENING
1-1/8
(29)
018 024 030 036 042 048/060
in. mm in. mm in. mm in. mm in. mm in. mm
A 38 965 40-1/2 1029 43 1092 52-1/2 1334 48 1219 52-1/2 1334
B 15 381 18-1/2 470 18-1/2 470 21-7/8 556 21-7/8 556 21-7/8 556
C 22 559 22 559 22 559 22 559 26-1/4 667 26-1/4 667
D 13 330 16-1/2 419 16-1/2 419 19-7/8 505 19-7/8 505 19-7/8 505
E 14-1/2 368 14-1/2 368 14-1/2 368 14-1/2 368 18-3/4 476 18-3/4 476
F 8 203 8 203 8 203 8 203 9-1/4 235 9-1/4 235
G 5-5/8 143 5-5/8 143 5-5/8 143 5-5/8 143 4-1/2 114 4-1/2 114
H 12-3/4 324 16-1/4 413 16-1/4 413 19-5/8 498 19-5/8 498 19-5/8 498
J 20-3/8 518 20-3/8 518 20-3/8 518 20-3/8 518 24-5/8 625 24-5/8 625
Note: Unit is shipped congured for horizontal left-hand air discharge. Unit may be converted to horizontal right-hand air
discharge by repositioning horizontal drain pan.
Dimensions remain the same in all congurations.
1-1/8
(29)
507621-01Issue 1720Page 2 of 23
NOTE: These instructions are intended as a general guide and
do not supersede national, state or local codes in any way.
Shipping and Packing List
Package 1 of 1 contains the following:
1 - Assembled air handler unit factory-equipped for upow
or horizontal air discharge application (includes upow
and horizontal drain pans and pre-installed air lter).
Check equipment for shipping damage. If found,
immediately report damage to the last carrier. Check the
unit rating plate to conrm that delivered unit matches
order.
General
These air handlers are designed for indoor installation
only. As shipped, the unit is ready for installation in either
upow or horizontal left-hand air discharge applications.
Horizontal drain pan may be repositioned in the eld to
allow installation in the horizontal right-hand air discharge
position. Downow applications can be accomplished by
purchasing the available downow kit (see table 1).
All units come with a metering device installed.
CAUTION
Physical contact with metal edges and corners while
applying excessive force or rapid motion can result in
personal injury. Be aware of, and use caution when
working near these areas during installation or while
servicing this equipment.
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 Allied Air 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).
Model Downow Kit
-018 96W37
-024, -030 96W38
-036 97W95
-042, -048, -060 97W96
Table 1. Downow Kits
Requirements
IMPORTANT
These units are designed to match, and must be
used with, outdoor units as rated. The indoor sections
are manufactured with a metering device installed
to provide optimum refrigerant control and system
performance with a variety of different capacities of
outdoor units.
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.
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). 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 specic
information.
507621-01 Issue 1720 Page 3 of 23
WARNING
Installation Clearances
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 the
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
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 BCE3M*C or BCS3M*C 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.
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.
IMPORTANT
Horizontal applications of the air handler must be
installed sloped (approximately 5/8 inch) toward the
drain pan openings to ensure proper condensate
drainage.
Installation
General Information
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 qualied installer or service agency.
These units are factory-assembled and congured for
installation in upow or horizontal left-hand air discharge
applications. Horizontal drain pan may be repositioned in
the eld to allow installation in the horizontal right-hand air
discharge position.
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 conguration changes before setting air handler in
place.
507621-01Issue 1720Page 4 of 23
For all performance testing, units must be tested in the
upow orientation with the horizontal drain pan removed.
Refrigerant Metering Device
These units are equipped with a factory-installed metering
device (TXV or piston). Ensure the indoor coil metering
device is properly sized for the outdoor unit being used.
Upow 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 upow application, remove the
horizontal drain pan.
IMPORTANT - The horizontal drain pan is not required
in upow air discharge installations; its removal
provides the best efciency 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.
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 right-hand
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.
Left-Hand Air Discharge
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 drain pan end of
the unit (see gure 11).
4. The left-hand air discharge horizontal conguration is
shown in gure 2.
AIR FLOW
Drains
HORIZONTAL DRAIN PAN
IMPORTANT - REMOVE PAN
FOR BEST EFFICIENCY
AND AIR FLOW.
HORIZONTAL DRAIN
UP-FLOW
DRAIN PAN
UP-FLOW DRAIN
CONNECTIONS (BOTH
SIDES; USE ONE SIDE
OR OTHER)
CONNECTIONS
(BOTH SIDES; NOT
USED)
Figure 1. Upow Conguration
Horizontal Applications
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 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.
PLUGS
LEFT‐HAND DRAINS
Figure 2. Left-Hand Discharge Conguration
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.
ANGLE IRON OR SHEET METAL
MAXIMUM 1/2”
LONG SCREW
AIR FLOW
FRONT VIEW
ELECTRICAL INLET CLEARANCE
4 IN. (102 MM)
END VIEW
Figure 3. Suspending Horizontal Unit
507621-01 Issue 1720 Page 5 of 23
Right-Hand Air Discharge
For horizontal right-hand air discharge, the following eld
modications are required.
1. Remove and set aside blower and coil access panels.
2. Remove brackets securing pan to unit. See gure 4.
Figure 4
3. Remove coil assembly, bottom drain pan and
horizontal drain pan as one unit from the air handler.
See gure 5.
4. Remove the blow-off prevention brackets, top cap and
drip pan between slabs. Move the horizontal drain pan
to the opposite side of the coil. See gure 6.
NOTE: The 1.5- and 2-ton units do not have or require
blow-off prevention brackets or drip pan.
Figure 5
Figure 6
507621-01Issue 1720Page 6 of 23
5. Reinstall the top cap. Rotate the blow-off prevention
brackets 180º and reinstall using the same screws.
Use the correct mounting holes; the brackets must
cover the hairpins. See gure 7.
7. Reinstall the brackets that hold the coil and horizontal
drain pan in place. See gure 9.
Figure 7
6. Slide coil assembly, bottom drain pan and horizontal
drain pan as one unit back into the air handler. See
gure 8.
Figure 9
8. Reinstall the blower and coil access panels.
Figure 8
507621-01 Issue 1720 Page 7 of 23
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