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

4.4 Oil connection

Observe the following for all connections retrofitted on
the compressor:
NOTICE
!
!
Risk of refrigerant loss!
Check the threads.
Screw in the adapter carefully with the required
tightening torque.
Perform a tightness test before commissioning!
Pressure gauge connection at the oil service valve
The pressure gauge connection at the oil service valve
is equipped with a screwing cap (7/16-20 UNF, tighten-
ing torque max. 10 Nm).

4.5 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.
Information
Detailed descriptions of the capacity control and
the start unloading as well as their control, see
manual SH-170.
4.5.1

Solenoid valves and control sequences

CR1
(Y1)
CR3
(Y3)
Fig. 5: Arrangement of the solenoid valves
34
Tab. 2: Infinite capacity control (CR) in the range 100% .. 25%
Tab. 3: Infinite capacity control (CR) in the range 100% .. 50%
Tab. 4: 4-stage capacity control (CR)
CR2
(Y2)
Tab. 5: Legends
Capacity steps 75%/50%/25% are nominal values. The
real residual capacities depend on the operating condi-
tions and on the compressor design. The data can be
determined with the BITZER Software.
CR4
(Y4)
CR
Start / Stop
CAP ⇑
CAP ⇓
CAP ⇔
CR
Start / Stop
CAP ⇑
CAP min. 50% ⇓
CAP ⇔
CR
Start / Stop
CAP 25%
CAP 50%
CAP 75%
CAP 100%
CAP Cooling capacity
CAP ⇑ Increase cooling capacity
CAP ⇓ Decrease cooling capacity
CAP ⇔ Constant cooling capacity
Solenoid valve de-energized
Solenoid valve energized
Solenoid valve pulsing
Solenoid valve intermittent
(10 s on / 10 s off)
Information
In part-load operation, the application ranges
are limited! See manual SH-170 or BITZER
Software.
Y1 Y2 Y3
Y1 Y2 Y3
Y1 Y2 Y3
SB-170-7
Y4
Y4
Y4