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Condensate Drain
Connect main condensate drain and route downward to an
open drain or sump. Do not connect drain to a closed waste
system. Refer to figure 8 for typical condensate trap con-
figuration.
Typical Condensate Drain Connection
Minimum 1 inch (25 mm) pitch
per 10 feet (3048mm) of line
Trap must be deep enough to
offset maximum static difference
(generally, 2" [51mm] minimum).
Figure 8
It is recommended that the auxiliary drain be connected to
a drain line for all units. If auxiliary drain is not connected, it
must be plugged with provided cap. For downflow units,
the auxiliary drain MUST be connected and routed to a
drain. See figure 9 for auxiliary and main drain locations.
Left−Hand
Upflow or
Discharge
Downflow
Auxiliary drain on left
Figure 9
The following practices are recommended to ensure con-
densate removal (see figures 8 and 9):
1. Drain piping should not be smaller than the drain con-
nections at drain pan.
2. A trap must be installed in the main drain line.
3. The trap must be deep enough to offset the difference
in static pressure between drain pan and atmosphere.
Generally, two inches is satisfactory for medium static
applications.
4. Horizontal runs must be sloped 1 inch per 10 feet of
drain line to offset friction.
5. An open vent in drain line will sometimes be required due
to line length, friction and static pressure.
6. Drain construction and routing should facilitate future
cleaning and must not interfere with filter access.
7. Auxiliary drain should run to an area where homeown-
er will notice any drainage. Refer to local codes.
Pipe diameter difference
Coil
drain
pan
Right−Hand
Discharge
Main drain on right
Page 9
Filters
IMPORTANT
Filter access panel must be in place during unit op-
eration. Excessive warm air entering the unit may re-
sult in water blow−off problems.
Each unit includes a factory−installed filter. Note that filter
access door fits over access panel. Air leakage will occur if
access panel is placed over filter door.
Filters should be inspected monthly and must be cleaned
or replaced when dirty to assure proper furnace operation.
Reusable filters supplied with some units can be washed
with water and mild detergent. Some units are equipped
with standard throw−away type filters which should be re-
placed when dirty.
To remove filter, loosen the thumbscrews holding the filter
panel in place. Slide filter out of the guides on either side of
cabinet, insert new filter and replace panel. See Table 2 for
replacement filter sizes.
Filter Dimensions
Unit Model No.
CB29M/CB30M−21/26, CB29M−31
CB29M−41, −46, CB30M−31
CB29M−51, −65, CB30M−41, −46
CB30M−51, −65
Sealing the Unit
It is very important to 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.
Make sure the liquid line and suction line entry points are
sealed with either the provided Armaflex material or with
Permagum. Permagum may also be used to seal around
the main and auxiliary drains and around open areas of
electrical inlets.
Table 2
Filter Size
Inches (mm)
15 x 20 (381 x 508)
20 x 20 (508 x 508)
20 x 22 (508 x 559)
20 x 24 (508 x 610)
CB29M/CB30M SERIES
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