Accessories; Capacity Regulator - BOCK FK40 Series Assembly Instructions Manual

7| Accessories

7.1 Capacity regulation
ATTENTION
FK40 / ...
Designation
Special accessory 12 V
Special accessory 24 V
For a description, see technical information "Capacity regulation" (Item No. 09900)
If the capacity regulator is factory-fitted, it is integrated into an extra, dedicated cylinder cover. For
retrofits, it is supplied with the cylinder cover. The regulator closes one cylinder bank (capacity regula-
tion approx. 50%).
Capacity-regulated operation alters the gas speeds and pressure
ratios of the refrigerating plant: Adjust the suction line routing and
dimensioning accordingly, do not set the control intervals too close and
do not let the system switch more than 12 times per hour (refriger-
ating plant must have reached a state of equilibrium). Continuous
operation in the control stage is not recommended as the gas
velocity in the plant system under certain circumstances does not
guarantee sufficient oil return to the compressor with activated
capacity regulator for a compressor speed below 1200 - 1500 rpm.
We recommend switching to unregulated operation (100% capacity)
for at least 5 minutes per capacity-regulated operating hour. An
assured oil return can also be realised by a 100% capacity require-
ment after each compressor restart as otherwise the compressor
can also be shut down in the regulated operating time by the
thermostat.
Electrical actuation of the solenoid valve: Normally open, (cor-
responds to 100 % compressor capacity).
Cylinder covers for capacity regulation are marked with the
designation "CR" (Capacity Regulator).
... N + TK
Ref. No.
08703
08704
... K
Ref. No.
08708
08709
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