Electrical data, connections and wiring
Compressor models SM / SZ 175 – 185 R and C version
Legends
Compressor models SY / SZ 240 - 300 - 380
Compressor models SM/SZ175-185 (J, K, P, S, U, W, X, Y versions)
Fuses F1
Compressor contactor
KM
Control relay
KA
Safety lock out relay
KS
Optional short cycle timer (3 min)
180 s
External overload protection
F2
Pump-down pressure switch
LP
High pressure safety switch
HP
Control device
TH
Liquid Line Solenoid valve
LLSV
Discharge gas thermostat
DGT
Fused disconnect
Q1
Motor safety thermostat
thM
Compressor motor
M
Motor Protection Module
MPM
Thermistor chain
S
Safety pressure switch
LPS
CONTROL CIRCUIT
F1
F1
KA
KA
KA
HP
LPS
T1
T2
T3
KM
DGT
KS
KS
1
2
M
Th
M
KS
KS
KA
KM
KM
LLSV
180s
TH
F2
Q1
L1
L3
L2
A1
A2
A3
Wiring diagram with pump-down cycle
LP
CONTROL CIRCUIT
F1
F1
KA
KA
KA
HP
T1
T2
T3
KM
DGT
KS
KS
1
2
TH
KS
LPS
KA
KM
180s
F2
Q1
L1
L3 L2
M
Th
M
A1
A2
A3
Wiring diagram without pump-down cycle
A1
A3
A2
MPM
S
LPS
Wiring diagram with pump-down cycle
LP
A1
A3
A2
MPM
S
KS
Wiring diagram without pump-down cycle
LPS
A1
A3
A2
LP
LPS
MPM
12 14 11
N
2
1
L1
S
Wiring diagram with pump-down cycle
A1
A3
A2
LPS
MPM
12 14 11
N
2
1
L1
Wiring diagram without pump-down cycle
Application guidelines
20
FRCC.PC.003.A5.22