Installing The Condensate Drain - Lennox CBA25UHV-018 Unit Information

Installing the Condensate Drain

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
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
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
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.
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.
SLOPING THE UNIT
Make sure the unit is sloped (similar to the slope shown
in figure 22) so that the drain pan will empty completely
without water standing in the pan.
IMPORTANT
OVERFLOW DRAIN LINE
SWITCH KIT. WIRE KIT TO
LENNOX #
X3169
AIR HANDLER DRAIN PAN
DRAIN
FOOTPRINT
MAIN
DRAIN
DRAIN OUTLET OF
FIGURE 21. Typical Main and Overflow Drain Installations
SHUT DOWN
CLEAN OUT
PRESS IN
(DO NOT GLUE)
MAIN
CUT TO
REQUIRED
LENGTH
PROVIDED
2
PIPE NIPPLE
SIDE VIEW
FOR NEGATIVE PRESSURE COILS (BLOWER
AFTER COIL) TRAPS ARE REQUIRED ON ALL
DRAIN LINES CONNECTED TO COIL.
THIS CORNER SHOULD BE 5/8" (+/- 1/8") HIGHER
THAN DRAIN CORNER
FIGURE 22. Sloping the Unit for Proper Drainage
Page 24
VENT MUST EXTEND
ABOVE HEIGHT OF
COIL DRAIN PAN BY
TWO INCHES (51MM)
VENT
1" X 3/4" X 3/4"
REDUCING
TEE WITH
PLUG
1
LENNOX P-TRAP
49P66, J-TRAP #
91P90 OR ANY
PVC SCH 40 P- OR
J-TRAP 3/4" 2"
(51MM)
TRAP DEPTH
DRAIN CORNER
TO APPROVED
DRAIN
DRAIN LINE SHOULD
SLOPE A MINIMUM OF
ONE INCH PER 10
FEET (25MM PER 3
METERS)