Page 7
CBX32M SERIES
TOP VIEW
OPENING
SIDE VIEW
1-5/8 (41)
11-3/8
(289)
2 (51)
22-1/8 (562)
5/8 (16)
13-3/8 (340)
SUPPLY
AIR
OPENING
18−1/4 (464)
CBX32M−21/26
and 31
CB30M−21/26
23−1/4 (591)
CBX32M−41 to −65
CB30M−31 to 65
15 (381)
CBX32M−21/26
and 31
CB30M−21/26
20 (508)
CBX32M−41 to −65
CB30M−31 to 65
1-5/8 (41)
1-5/8 (41)
inches
(mm)
Figure 7. Downflow Combustible Base Dimensions
If the homeowner reports water dripping from supply air
diffusers, check the shields and tape. Make sure the tape is
completely attached to the edges of the drip shield, and
that the drip shield is wedged firmly in place.
Brazing Connections
WARNING
Danger of explosion!
Can cause equipment damage, injury,
or death.
When using a high pressure gas such
as dry nitrogen to pressurize a
refrigeration or air conditioning
system, use a regulator that can
control the pressure down to 1 or 2 psig
(6.9 to 13.8 kPa).
IMPORTANT
To prevent the build up of high levels of nitrogen
when purging, be sure it is done in a well ventilated
area. Purge low pressure nitrogen (1 to 2 psig)
through the refrigerant piping during brazing. This
will help to prevent oxidation and the introduction
of moisture into a system.
All coils are equipped with a factory−installed, internally
mounted check/expansion valve, which is suitable for use
in applications as follows:
S
valve suitable for HCFC−22 use (CBX32M unit)
S
valve suitable for HFC−410A use (CB30M unit)
The CBX32M/CB30M air handler’s coil line sizes are listed
in table 2. Use Lennox L15 (sweat) series line sets (refer to
the outdoor unit Engineering Handbook for proper size,
type and application). For field−fabricated refrigerant lines,
see the piping section of the Lennox Unit Information
Service Manual.
AIR HANDLER UNIT
SUCTION LINE
LIQUID LINE
Figure 8. Brazing Connections
NOTE − CBX32M series evaporators use nitrogen or dry
air as a holding charge. If there is no pressure when the
rubber plugs are removed, check the coil or line set for
leaks before installing. After installation, pull a vacuum
on the line set and coil before releasing the unit charge
into the system.
