BOCK FK40 Series - 7 Accessories; Capacity Regulator

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7| Accessories
7.1 Capacity regulation
Foradescription,seetechnicalinformation"Capacityregulation"(ItemNo.09900)
Ifthecapacityregulatorisfactory-tted,itisintegratedintoanextra,dedicatedcylindercover.For
retrots,itissuppliedwiththecylindercover.Theregulatorclosesonecylinderbank(capacityregula-
tionapprox.50%).
FK40 / ... ... N + TK ... K
Designation Ref. No. Ref. No.
Special accessory 12 V 08703 08708
Special accessory 24 V 08704 08709
ATTENTION 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sufcient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).