Provide power supply and electrical protection
Requirements:
• An additional external overload protection is
still advisable for either alarm or manual reset.
For overload setting, take the max current
you can face on the application and add
10%. Setting must always be lower than Max
Operating Current (see table “Three phase
electrical characteristics” from the section
“Electrical data, connections and wiring”)
• HP safety switch and DGT must be wired in the
safety chain. Other safety devices such as LP can
be either hardware or software managed.
• Provide separate electrical supply for the
heaters so that they remain energized even
when the machine is out of service (e.g.
seasonal shutdown).
The wiring diagrams below are examples for a safe and reliable compressor wiring:
Wiring information
Control device .................................................. TH
Optional short cycle timer (3 min) .........180 s
Control relay .................................................... KA
Liquid Line Solenoid valve .........................LLSV
Compressor contactor .................................. KM
Phase monitor ................................................ PM
Safety lock out relay ........................................KS
Pump-down control low pressure switch ..LP
High pressure safety switch........................ HPs
Fused disconnect ............................................Q1
Fuses ...................................................................F1
Compressor motor ...........................................M
Discharge gas thermostat ......................... DGT
M
DGT
HPs
180 s
TH
LP
CONTROL CIRCUIT
F1
F1
KM
KM
KM
KA
KA
A1
A2
A3
KA
KA
KS
KS
KS
L1
L3
L2
Q1
T1
T3
T2
LLSV
KS
Wiring diagram with pump-down cycle
PM
Note:
For H-series compressor, phase monitors are mandatory. The selected phase monitor should lock out
the compressor from operation in reverse.
35
FRCC.PC.012.A7.02
GENER
AL INFORM
ATION
PR
ODUC
T INFORM
ATION
INTEGR
ATION INT
O SY
STEM
ORDERING INFORM
ATION
SY
STEM DESIGN