Hs.95: Capacity Control (Cr) And Start Unloading (Su) - Bitzer HS.8551 Instructions De Service

CR
Start / Stop
CAP ⇑
CAP min. 50% ⇓
CAP ⇔
Tab. 3: Infinite capacity control (CR) in the range 100% .. 50%
CR
Start / Stop
CAP 25% ①
CAP 50%
CAP 75%
CAP 100%
Tab. 4: 4-step capacity control (CR)
CAP Refrigerating capacity
CAP ⇑ Increase refrigerating capacity
CAP ⇓ Decrease refrigerating capacity
CAP ⇔ Constant refrigerating capacity
Solenoid valve de-energized
Solenoid valve energized
Solenoid valve pulsing
Solenoid valve intermittent
(10 s on / 10 s off)
① 25%-step only: at compressor start (start
unloading) and for compressor models in
the low-pressure range (see application
limits SP-110)
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. Data can be de-
termined using BITZER SOFTWARE.
Information
In part-load operation, application ranges are
limited! See Manual SP-110 or BITZER SOFT-
WARE.
4.5 HS.95: Capacity control (CR) and start unloading
(SU)
The HS.95 compressors are equipped with an infinite
capacity control (slide control). The compressor module
controls the solenoid valves. Interconnected electronic
controls allow operators to selectively activate certain
additional part-load points as needed (depending on
the application limits). For detailed explanations of ca-
10
Y1 Y2 Y3
Y1 Y2 Y3
pacity control activation, see Technical Information
Y4
ST-150.
Information
For start unloading, the compressor module
sets the capacity slider to the minimum dis-
placement. A period of approx. 5 min must be
provided for this in the system controller.
Y4
CR(-) CR(+)
Fig. 6: HS.95: Arrangement of the solenoid valves
SB-110-3