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VIII−MAINTENANCE
WARNING
Improper installation of the air handler can result in
personal injury or death.
Do not allow external combustion products or other
contaminants to enter the return air system or to be mixed
with air that will be supplied to the living space. Use sheet
metal screws and joint tape or duct mastic to seal return
air system to air handler. In platform installations, the air
handler should be sealed airtight to the return air plenum.
A door must never be used as a portion of the return air
duct system. The base must provide a stable support and
an airtight seal to the air handler. Allow absolutely no
sagging, cracks, gaps. etc.
For no reason should return and supply air duct systems
ever be connected to or from other heating devices such
as a fireplace or stove. etc. Fire, explosion, carbon
monoxide poisoning, personal injury and/or property
damage could result.
WARNING
Electric shock hazard. Can cause injury or
death. Before attempting to perform any
service or maintenance, turn the electrical
power
to
switch(es). Unit may have multiple power
supplies.
At the beginning of each heating/cooling season, the
system should be checked as follows:
A−FILTERS
IMPORTANT
Filter access panel must be in place during unit operation.
Excessive warm air entering the unit from unconditioned
space may result in water blow−off problems.
Filters may be duct−mounted or installed in the cabinet. A
filter is installed at the factory. Note that filter access door
fits over access panel. Air will leak if the access panel is
placed over the filter door.
Filters should be inspected monthly and must be cleaned or
replaced when dirty to assure proper furnace operation.
To replace filter:
1. Loosen the thumbscrews holding the filter panel in
place.
2. Slide the filter out of the guides on either side of cabinet.
3. Insert new filter.
4. Replace panel.
CBX40UHV
unit
OFF
at
disconnect
See the tables below for replacement filter sizes.
Table 17. MERV16 Disposable Filter (five inch)
Unit Model No.
CBX40UHV−024,
−030 and −036
−CBX40UHV−048,
−042, and −060
Table 18. Disposable Filter (one inch))
Unit Model No.
CBX40UHV−024,
−030 and −036
−CBX40UHV−048,
−042, and −060
NOTE
To use one inch filter bend tabs up as illustrated in
figure 32.
FILTER
COMPARTMENT
B−SUPPLY AIR BLOWER
1. Check and clean blower wheel.
2. Motors are prelubricated for extended life; no further
lubrication is required.
C−ELECTRICAL
1. Check all wiring for loose connections.
2. Check circuit breaker located in unit control box.
3. Check for correct voltage at unit (unit operating).
4. Check amp-draw using a True RMS amp meter. Typical
clamp−on ammeters do not read current accurately.
5. Check to see that heat (if applicable) is operating.
D−INSULATION
Outdoor piping insulation should be inspected yearly for
deterioration. If necessary, replace with same materials.
Page 37
Filter Size Inches (mm)
20 x 20 x 5 (508 x 508 x 127)
20 x 25 x 5 (508 x 635 x 127)
Filter Size Inches (mm)
20 x 20 x 1 (508 x 508 x 25)
20 x 25 x 1 (508 x 635 x 25)
BEND ALL THREE
TABS
Figure 32. Tabs
Catalog #
X7935
X6675
Catalog #
X1963
X1970
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