Oil Connection; Capacity Control (Cr) And Start Unloading (Su); Solenoid Valves And Control Sequences - Bitzer CSH6553-35Y Operating Instructions Manual

Additional connections for evacuation
For an optimal evacuation capacity, it is recommended
to install generously-sized, lockable additional connec-
tions on the discharge and suction sides. Sections
locked by check valves must have separate connec-
tions.
Observe the following for all connections retrofitted
on the compressor
NOTICE
!
!
Risk of refrigerant loss!
Check the thread.
Carefully screw the adapter in and tighten it to
the prescribed tightening torque.
Test tightness before commissioning!

5.4 Oil connection

Pressure gauge connection on the oil valve for
maintenance
The pressure gauge connection on the oil valve for
maintenance is delivered with a screwing cap
(7/16-20 UNF, tightening torque max. 10 Nm). In case
of any modification, proceed very carefully.
NOTICE
!
!
Risk of refrigerant loss!
Check the thread.
Carefully screw the adapter in and tighten it to
the prescribed tightening torque.
Test tightness before commissioning!

5.5 Capacity control (CR) and start unloading (SU)

The standard CS. versions are equipped with a "Dual
capacity control" (control with a slider). This allows in-
finite as well as 4-stage regulation without any rebuild-
ing of the compressor. The only difference in the oper-
ating mode is the activation of the solenoid valves.
The capacity control of CSW105 compressors is auto-
matically controlled via the CM-SW-01 compressor
module.
Information
For detailed descriptions on capacity control
and start unloading as well as their control, see
manual SH-170.
SB-170-10
5.5.1

Solenoid valves and control sequences

CR1
(Y1)
CR3
(Y3)
Fig. 7: Arrangement of the solenoid valves
CR
Start / Stop
CAP ⇑
CAP ⇓
CAP ⇔
Tab. 4: Infinite capacity control (CR) in the range 100% .. 25%
CR
Start / Stop
CAP ⇑
CAP min. 50% ⇓
CAP ⇔
Tab. 5: Infinite capacity control (CR) in the range 100% .. 50%
CR
Start / Stop
CAP 25%
CAP 50%
CAP 75%
CAP 100%
Tab. 6: 4-stage capacity control (CR)
CR2
(Y2)
CR4
(Y4)
Y1 Y2 Y3
Y1 Y2 Y3
Y1 Y2 Y3
Y4
Y4
Y4
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