Air Flow - Cooling Blower Speed - Lennox CBA25UH Installation Instructions Manual

THERMOSTAT
R
G
SEE
NOTE
Y
COOLING ONLY APPLICATION
THERMOSTAT
R
G
SEE
Y
NOTE
COOLING APPLICATION WITH
ELECTRIC HEAT
NOTE - Connect common wire only if required (Refer to the appropriate thermostat installation instructions).
FIGURE 15. Low Voltage Connections (3-Speed PSC Motor) – Field Wiring
Air Flow – Cooling Blower Speed
The cooling blower speed is factory configured to provide
correct air flow for an outdoor unit that matches the cool-
ing capacity rating of the air handler.
If the outdoor unit is smaller than the maximum cooling ca-
pacity rating for the air handler, the cooling blower speed
may need to be changed. Refer to blower performance
chart, table 2 on page 16 .
WARNING
Electric shock hazard! - Disconnect all power
supplies before servicing.
Replace all parts and panels before
operating.
Failure to do so can result in death or
electrical shock.
AIR HANDLER
BU
AIR
CONDITIONER
UNIT
AIR HANDLER
CONNECT COMMON
WIRE ONLY IF
(REFER TO THE
W
APPROPRIATE
THERMOSTAT
INSTALLATION
BK
INSTRUCTIONS)
BU
AIR CONDITIONER
UNIT
THERMOSTAT
SEE
NOTE
THERMOSTAT
REQUIRED
CHANGE BLOWER SPEED
1 - Disconnect all power supplies.
2 - Remove the air handler access panel.
3 - Locate pin number 2 on the blower relay. Two
black wires are connected to this terminal pin. One
connects to pin number 5 on the blower relay, one
connects to an in-line splice connecting to a blue
wire.
4 - Select the required blower motor speed. Connect
red-LO or black-HI and plug it into the 4-pin blower
relay harness connector.
NOTE - Reuse the factory-installed wire nut on the un-
used wires.
5 - Replace all panels.
6 - Reconnect power.
Page 15
AIR HANDLER
R
G
BU
W
HEAT ONLY APPLICATION
AIR HANDLER
R
G
BU
BK
W
HEAT PUMP APPLICATION WITH
ELECTRIC HEAT
HEAT PUMP
UNIT