Inspecting And Replacing Filters; Sealing The Unit; Typical Main And Overflow Drain Installations; Filter Dimensions - Lennox CBX32MV-018/024 Manual

ABOVE
ALWAYS RUN AN OVERFLOW DRAIN LINE. IF NOT POSSIBLE TO
FINISHED
ROUTE OVERFLOW DRAIN LINE, INSTALL LOW VOLTAGE
SPACE?
OVERFLOW
COMPRESSOR PER INSTRUCTIONS.
COMPACT OVERFLOW SWITCH WITH 3/4" FEMALE SLIP INLET
NO
AND MALE ADAPTER, TWO PART DESIGN FOR USE WHERE
OBSTRUCTIONS PREVENT DIRECT THREADING
OVERFLOW
DRAIN
YES
NOTE — WHEN A AIR HANDLER IS LOCATED
ABOVE A FINISHED SPACE THE SECONDARY
DRAIN PAN 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:
S
CONNECTED TO SECONDARY DRAIN PAN
OR
S
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
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.

Inspecting and Replacing Filters

IMPORTANT
Filter access door must be in place during unit operation.
Excessive warm air entering the unit from unconditioned
space may result in water blow-off problems.
Filters may be duct-mounted or installed in the cabinet. A
filter is installed at the factory. Note that filter access door
fits over access panel. Air will leak if the access panel is
placed over the filter door.
Filters should be inspected monthly and must be cleaned or
replaced when dirty to assure proper furnace operation.
To replace filter:
1. Loosen the thumbscrews holding the filter panel in
place.
2. Slide the filter out of the guides on either side of cabinet.
3. Insert new filter.
4. Replace panel.
See Table 4 for replacement filter sizes.
OVERFLOW DRAIN LINE
SWITCH KIT. WIRE KIT TO
LENNOX #
X3169
MAIN
AIR HANDLER DRAIN PAN
DRAIN
CUT TO
REQUIRED
LENGTH
MAIN
DRAIN
PROVIDED
PIPE NIPPLE
SIDE VIEW
Figure 13. Typical Main and Overflow Drain Installations
VENT MUST EXTEND
SHUT DOWN
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
LENNOX
49P66, J-TRAP #
91P90 OR ANY
PVC SCH 40 P- OR
J-TRAP 3/4"
2
FOR NEGATIVE PRESSURE COILS (BLOWER
AFTER COIL) TRAPS ARE REQUIRED ON ALL
DRAIN LINES CONNECTED TO COIL.
Table 4. Filter Dimensions
Unit Model No.
-018/024
-024/030
-036
-048 and -060
-068

Sealing the Unit

There must be an airtight seal between the bottom of the
air handler and the return air plenum. Use fiberglass
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 fireplace) is installed.
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.
Page 23
VENT
PLUG
1
P-TRAP
2"
(51MM)
TRAP DEPTH
DRAIN LINE SHOULD
SLOPE A MINIMUM OF
ONE INCH PER 10
FEET (25MM PER 3
METERS)
Filter Size Inches (mm)
15 X 20 x 1(381 x 508 x 25)
20 x 20 x 1(508 x 508 x 25)
20 x 20 x 1(508 x 508 x 25)
20 x 24 x 1(508 x 610 x 25)
20 x 25 x 1(508 x 635 x 25)
WARNING
TO APPROVED
DRAIN
CBX32MV