Condensate Drain; Filters; Supply & Return Connections - Lennox 13CHA SERIES Installation Instructions Manual

Condensate Drain

The 13CHA unit is equipped with a 3/4 inch FPT coupling
for condensate line connection. Plumbing must conform to
local codes. Use a sealing compound on male pipe
threads.
The drain line must be properly trapped and routed to a
suitable drain. See figure 3 for proper drain arrangement.
The drain line must pitch to an open drain or pump a
minimum of 1 inch per 10 feet to prevent clogging of the
line. Seal around drain connection with suitable material to
prevent air leakage into return air system.
NOTE − Drain line connection may not carry the weight of
the unsupported drain line. Support the drain line, if
necessary.
Drain piping should not be smaller than drain connection at
coil. An open vent in drain line will some times be required
due to line length, friction and static pressure. Drains
should be constructed in a manner to facilitate future clean-
ing.
NOTE − The condensate drain line MUST be trapped to
provide proper drainage.
CAUTION
Condensate line connection must be hand−tight-
ened. Do not use tools.
Typical Condensate Drain
Unit
Positive Liquid Seal Required
Figure 3

Filters

Filters are not factory−supplied with the unit; however,
optional internally installed filter kits are available. Filter kit
92M54 is used with 2, 2−1/2 and 3−ton units. Filter kit 92M55
is used with 3−1/2, 4 and 5−ton units. The filter kits
Drain Connection
1.00" Min.
3.00" Min.
12.00"
Max.
accommodate the use of 1", 2" or 4" filters. If the optional
filter kit is not used, a filter must be field−installed.
Filters must always be installed ahead of evaporator coil
and must be kept clean or replaced. Dirty filters will reduce
the airflow of the unit. Filter sizes are shown in table 1.
Unit Model
−24, −30, −36
−42, −48, −60
Supply & Return Duct Connections
The duct system should be designed and sized according
to the methods in Manual Q of the Air Conditioning
Contractors of America (ACCA).
A closed return duct system shall be used. This shall not
preclude use of economizers or outdoor fresh air intake. It
is recommended that supply and return duct connections
at the unit be made with flexible joints.
The supply and return air duct systems should be
designed for the CFM and static requirements of the job.
They should NOT be sized by simply matching the
dimensions of the duct connections on the unit.
Ducting installed outdoors MUST be insulated and
waterproofed.
When fastening duct system to side duct flanges on
unit, insert screws through duct flanges only. Do not
insert screws through casing. Outdoor duct must be
insulated and waterproofed.
The 13CHA unit is shipped ready for horizontal air
discharge (side duct connections). If bottom air discharge
is desired, the covers must be removed from the supply
and return air openings on the bottom of the unit and
re−installed to cover the side openings.
Removing Supply and Return
Air Opening Covers
1. Remove screw and lift.
2. Slide cover to free back pin.
Page 6
Table 1
Unit Filter Size
Filter Size Filter Quantity
20 in. X 25 in.
16 in. X 25 in.
CAUTION
2
1
Base
Figure 4
1
2