Inspecting And Replacing Filters; Wiring Diagrams - Lennox CBA25UHE Series Unit Information

208 VOLT CONVERSION
1 - Disconnect all power supplies.
2 - Remove the air handler access panel.
3 - Using the wiring diagram located on the unit access
panel as a reference, move the 2 connected black
transformer leads from the 240 volt terminal on
the transformer to the 208 volt terminal on the
transformer.
WARNING
Electrically ground air handler. Connect
ground wire to ground terminal marked
"GND".
Failure to do so can result in death or
electrical shock.

Inspecting and Replacing Filters

IMPORTANT
Filter access door 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.
See table 3 for replacement filter sizes.
TABLE 3. Filter Dimensions
CBA25UHE
-024, -030, -036
-042

Wiring Diagrams

1 Thermostat
R
C
1
E
1 Auxiliary Heat
W/
(Heat Pump)
W1
W2
1 2
Indoor Blower Only
G
Heat Pump
O
Compressor/1st Stage
Y1
Compressor/2nd Stage
2 Y2
1 Refer to thermostat installation instructions
If applicable
2
3 Install jumper for single-stage operation on
electric heater kits 12.5KW and above
FIGURE 20. Thermostat Designations –
NOTES: W1 / W2 are auxiliary heat
(supplemental to heat pump).
"E" is emergency heat (disables heat pump).
Page 23
Filter Size – In. (mm)
15 x 20 x 1 (381 x 508 x 25)
18 x 20 x 1 (457 x 508 x 25)
Indoor Unit
R
C
Auxiliary Heat
(Heat Pump)
W1
1 2
W2
G
O
Y1
Y2
Non-Communicating
Outdoor Unit
R
C
W1
3
O
Y1
Y2