Wiring In The State Of Delivery; Compressors For Standard Refrigerants; Compressors For Transcritical Co Applications; High Pressure Switch - Bitzer KT-230-2 Technical Information

7.7 Wiring in the state of delivery

Interventions on components that are delivered wired
and on their electrical connections are not necessary.
They are fully installed and wired at delivery:
7.7.1

Compressors for standard refrigerants

• Motor temperature monitoring (standard, R1 .. R6)
• Discharge gas temperature sensor (standard, R7)
• Oil heater (standard, R8)
• Oil monitoring (standard, F4)
• all solenoid valves for capacity control (option, Y3-1,
Y3-2, Y3-3), number depending on order and com-
pressor
• 1 solenoid valve for start unloading (option, Y1)
• The solenoid valve of the RI injection valve is sup-
plied as an accessory (option, Y5).
7.7.2 Compressors for transcritical CO
applications
• Motor temperature monitoring (standard, R1 .. R6)
• Discharge gas temperature sensor (standard, R7)
• Oil heater (standard, R8)
• Oil monitoring (standard, F4)
• all solenoid valves for capacity control (option, Y3-1,
Y3-2), number depending on order and compressor

7.8 High pressure switch

According to EN378, each compressor must be
provided with a high pressure switch (F5) for safety cut-
out in the safety chain. Depending on the displacement
and refrigerant charge, it must be designed as a safety
pressure cut-out and / or only as pressure cut-out. The
software-controlled monitoring of the compressor mod-
ule via the high pressure transmitter (B6) does not suffi-
ciently ensure the safety cut-out function. The high
pressure switch (F5) should preferably be connected to
terminal strip CN3 instead of the bridge.
The installation of a low pressure switch is not neces-
sary, depending on local regulations. The compressor
module is provided with an automatic low pressure cut-
out function.
KT-230-2

8 Connecting cables

Connect the compressor module electrically according
to the schematic wiring diagrams. Observe safety
standards EN60204-1, IEC60364 and national safety
regulations.
!
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Never apply voltage to the voltage outputs, not even for
testing.

8.1 Compressor power connection

The module housing of most compressors is mounted
on the terminal box. In this case, it must first be re-
moved. The installation situation differs depending on
the size of the terminal box.
Small terminal box
• 4FES-3(Y) .. 4BES-9(Y)
• 4PTE(U)-6(L)K .. 4KTE(U)-10(L)K
Installation situation: The module housing is mounted
on a bracket above the terminal box. The protective
conductor cable and the two cables for motor temperat-
ure monitoring run through a cable conduit.
➙ The module housing is fastened to the bracket with a
screw in each corner. The screw heads are located
below the holder.
• Remove all 4 screws.
• Carefully put the module housing aside. Do not pull
on the cable conduit.
• Remove the terminal box cover.
• Place the motor power cable through suitable cable
bushings in the terminal box.
WARNING
Risk of electric shock!
Before working on the terminal box, module
housing and electrical lines: Switch off the main
switch and secure it against being switched on
again!
Close the terminal box and the module housing
before switching on again!
NOTICE
The compressor module may be damaged or
fail!
Never apply any voltage to the terminals of CN7
to CN12 – not even for test purposes!
The voltage applied to the terminals of CN13
must not exceed 10 V!
The voltage applied to terminal 3 of CN14 must
not exceed 24 V! Do no apply voltage to the
other terminals!
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