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G−CONDENSATE DRAIN
LEFT−HAND AIR
UPFLOW OR
DISCHARGE
DOWNFLOW
OVERFLOW
DRAIN ON LEFT
Figure 29. Main and Overflow Drain Locations based
on Main Drain
Connect the main drain and route downward to drain line or
sump. Do not connect drain to a closed waste system. See
Figure 30 for typical drain trap configuration.
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
OPTIONAL
SAFETY
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).
*LENNOX P−TRAP 49P66 REQUIRES A LARGER INSTALLATION SPACE THAN THE J−TRAP 91P90.
CBX40UHV
RIGHT−HAND AIR
DISCHARGE
MAIN DRAIN ON
RIGHT
OVERFLOW DRAIN LINE
SWITCH
KIT.
WIRE
KIT
TO
LENNOX #
X3169
MAIN
AIR HANDLER DRAIN PAN
DRAIN
Figure 30. Main Drain
It is recommended that the overflow drain is connected to a
overflow drain line for all units. If overflow drain is not
connected, it must be plugged with provided cap.
For downflow orientation, the overflow drain MUST be
connected and routed to a overflow drain line. See Figure
30 for main and overflow drain locations based on coil
orientation.
The following best practices are recommended to ensure
better condensate removal:
S
Main and overflow drain lines should NOT be smaller
than both drain connections at drain pan.
S
Overflow drain line should run to an area where
homeowner will notice drainage.
S
It is recommended that the overflow drain line be
vented and a trap installed. Refer to local codes.
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
LENNOX* P−TRAP
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.
Page 35
OVERFLOW DRAIN
BEST PRACTICES
VENT
TEE WITH
PLUG
2"
(51MM)
TRAP DEPTH
DRAIN LINE SHOULD
SLOPE A MINIMUM OF
ONE INCH PER 10
FEET (25MM PER 3
METERS)
TO APPROVED
DRAIN
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