6
The unit also has legacy 24 VAC inputs to support non-com-
municating systems. Route control wires through the low volt-
age port and terminate in accordance with the wiring diagram
provided inside the control panel cover.
HIGH
VOLTAGE
PORT
LOW
VOLTAGE
PORT
Voltage Ports
NOTE:
For two-stage units, refer to the Installation Instructions
supplied with the variable speed indoor units for field wiring
connections.
1
2
R
C
1
2
R
C
HEAT PUMP
COMMUNICATING
THERMOSTAT
1
2
R
C
B
L
U
E
R
E
D
W
H
T
B
L
K
INDOOR
UNIT
Communicating Thermostat
with Low Voltage Wires to Heat Pump
NOTE:
If the heat pump unit is wired in the communicating
mode together with the compatible communicating indoor unit
and CTK0*AA communicating thermostat, then the
communicating thermostat is able to search and identify the
condensing unit when power is applied to the system. Refer to
the Installation Manual of the optional communicating thermostat
for more information.
Use the dipswitch to select defrost time interval (30, 60, 90,
120 minutes). Factory default setting is 30 minutes. The
maximum defrost cycle time is 10 minutes.