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Page 10
R
G
AIR
CONDITIONER
UNIT
R
R
G
G
BU
W
W
BK
COOLING‐ONLY APPLICATION
AIR HANDLERTHERMOSTAT
HEAT‐ONLY APPLICATION
AIR HANDLERTHERMOSTAT
COOLING APPLICATION WITH
ELECTRIC HEAT
AIR HANDLERTHERMOSTAT
HEAT PUMP APPLICATION WITH
ELECTRIC HEAT
NOTE - Connect common wire only if required (Refer to the appropriate thermostat installation instructions)
BU
BU
SEE
NOTE
SEE
NOTE
SEE
NOTE
Y
Y
AIR CONDITIONER
UNIT
R
G
BU
W
BK
CONNECT COMMON
WIRE ONLY IF
REQUIRED
(REFER TO THE
APPROPRIATE
THERMOSTAT
INSTALLATION
INSTRUCTIONS)
AIR HANDLER
THERMOSTAT
HEAT PUMP
UNIT
Figure 12. Low Voltage Connections (3-Speed PSC Motor) - Field Wiring
Airflow — Cooling Blower Speed
The cooling blower speed is factory configured to provide
correct airflow for an outdoor unit that matches the cooling
capacity rating of the air handler.
If the outdoor unit is smaller than the maximum cooling
capacity rating for the air handler, the cooling blower speed
may need to be changed. Refer to blower performance
chart, table 2 on page 11 .
WARNING
Electric shock hazard! - Disconnect all
power supplies before servicing.
Replace all parts and panels before op
erating.
Failure to do so can result in death or elec
trical shock.
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 red wire.
4. Remove the wire going to the 4-pin blower motor
connector from the splice.
5. Connect the blower lead [Red (LO), Black (HI)] onto
the splice from the 4-pin blower motor connector.
NOTE — Reuse the factory-installed plastic cap on
whichever wire is not used.
6. Replace all panels.
7. Reconnect power.