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4
Electrical connection
4.1
General recommendations
The compressor terminal box has a wiring diagram on the inside of its cover. Before connecting the
compressor, ensure the supply voltage, the phases and the frequency match the nameplate data.
4.2
Electrical installation
4.2.1 Wiring diagrams
The recommended wiring diagrams are shown in figures hereunder.
NOTE: Emerson recommends using a contactor K2 for the safety chain in order to comply
with EN 60335.
Single-phase (PF*) compressors
For the ZH04K1P to ZH12K1P and ZHI05K1P & ZHI11K1P ranges of compressors t he f ollowing
circuit diagrams can be used:
Power circuit
Motor terminal connections
Legend
B1 ........... System controller
B3 ........... Discharge gas thermostat
C2 ........... Run capacitor
F1, F6...... Fuses
F3 ........... HP limiter
F4 ........... LP switch
Figure 17: Wiring diagrams for single-phase compressors
AGL_HP_ST_ZHK1P_EN_Rev00
Single-phase compressors are connected to the
Common (C), Start (S) and Run (R) connections
K1, K2 ......Contactors
Q1 ...........Main switch
R2............Crankcase heater
S1............Auxiliary switch
Y5............Solenoid valve for injection (
RCD.........Residual current device
Control circuit
L1
F1
K1
K1
K2
K2
F3
F4
B3
Y5
R2
K2
N
1
2
S1
P>
P<
B1
B1
K1
3
4
)
if available
17
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