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Table 2. Refrigerant Line Kits
Vapor/
CB31MV
Liquid
Suction
Units
Line
Line
3/8 in
−41
(10 mm)
(19 mm)
3/8 in
−51
(10 mm)
(22 mm)
3/8 in
1−1/8 in.
−65
(10 mm)
(29 mm)
Installing the 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 13 for typical condensate trap
configuration.
VENT MUST EXTEND ABOVE THE HEIGHT OF THE COIL
DRAIN PAN BY 2 INCHES (51 MM).
DRAIN PAN
TRAP MUST BE DEEP ENOUGH TO OFFSET
MAXIMUM STATIC DIFFERENCE (GENERALLY,
2 INCHES [51MM]).
DRAIN LINE SHOULD SLOPE A MINIMUM 1 INCH PER
10 FEET (25 MM PER 3 M)
Figure 13. Condensate Drain Connection
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 down−flow units,
the auxiliary drain MUST be connected and routed to a
drain. See figure 14 on page 9 for main and auxiliary
drain locations.
LEFT−HAND
UP−FLOW OR
DISCHARGE
DOWN−FLOW
AUXILIARY DRAIN ON LEFT
Figure 14. Main and Auxiliary Drain Locations
The following practices are recommended to ensure
condensate removal:
S
Drain piping should not be smaller than the drain
connections at drain pan.
S
Install a trap in the main drain line. 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.
L10
L15
Line Sets
Line Sets
L10−41
L15−41
3/4 in.
20 ft. − 50 ft.
20 ft. − 50 ft.
(6 m − 15 m)
(6 m − 15 m)
L10−65
L15−65
7/8 in.
30 ft. − 50 ft.
30 ft. − 50 ft.
(9 m − 15 m)
(9 m − 15 m)
Field
Fabricated
Fabricated
VENT
TRAP (49P66)
TO APPROVED DRAIN
RIGHT−HAND
DISCHARGE
MAIN DRAIN ON RIGHT
S
Slope horizontal runs 1 inch per 10 feet of drain line to
offset friction.
S
Leave an open vent in the drain line, as shown in figure
13 to overcome line length, friction and static pressure.
S
Construct drains in a manner which will facilitate future
cleaning. Drains must not interfere with filter access as
illustrated in figure 13 on page 9 .
S
Route auxiliary drain to an area where homeowner will
notice it draining. The auxillary drain line does not
required venting or a trap. Refer to local codes.
Field
Inspecting and Replacing Filters
Filter access panel must be in place during unit
operation. Excessive warm air entering the unit may
result in water blow−off problems.
Filters may be duct−mounted or installed in cabinet. A filter
is factory−installed. 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.
Units are equipped with standard throw−away type filters
which should be replaced when dirty.
To replace filter:
Step 1.
Loosen the thumbscrews holding the filter panel
in place.
Step 2.
Slide the filter out of the guides on either side of
cabinet.
Step 3.
Insert new filter.
Step 4.
Replace panel.
See table 3 for replacement filter sizes.
Unit Model No.
CB31MV−41
CB31MV−51, −65
Sealing the Unit
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 flexible elastomeric thermal
insulation, or field provided material (e.g. Armaflex,
Permagum or equivalent). Any of the previously mention
materials may be used to seal around the main and
auxiliary drains, and around open areas of electrical inlets.
Adjusting the BDC3 Blower Control Board
CB31MV units are equipped with a variable speed motor
that is capable of maintaining a specified CFM throughout
the external static range. A particular CFM can be obtained
by positioning jumpers (COOL, HEAT, and ADJUST) on
Page 9
IMPORTANT
Table 3. Filter Dimensions
Filter Size inches (mm)
20 x 22 (508 x 559)
20 x 24 (508 x 610)
CB31MV SERIES
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