Diagram of
R
efrigerant
C
ycle & Wiring
Refrigerant
F
low
D
iagram
3
Gas piping
Wide service valve
Pressure
sensor
High pressure switch
Low pressure switch
Compressor
Accumulator
4-way valve
Heat exchanger
Liquid piping
Check valve
Heating cycle
Cooling cycle
INDOOR UNIT
OUTDOOR UNIT
P
P
L
Heat exchanger
EEV
Service valve
Note
:
High pressure switch and low pressure switch are only valid for 48K
/
60K
model
s
.
Electrical Wiring Diagram
L1 L2 PE
Power supply
Power supply
Power supply
Thermostat
Indoor unit
Outdoor unit
Power
terminal
panel
OR
(L2)
(L2)
(
)
(L1)
(L1)
W1
B
C
R
Y
G
G R C
C B Y W SI
W1 SI
Note
:
The SI wire between the indoor and outdoor units is not mandatory, especially when the outdoor unit is connected to an
indoor unit of a different brand. It is more energy-efficient when the outdoor unit is connected to a Pioneer indoor unit via SI
wire. However, it still can run without it.
If the matching indoor (air handling) unit does not have an S1 terminal, then ignore the S1 to S1 connection.
