Owner manual

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09704-09.2013-DGbFITrCn
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7| Accessories
7.1 Capacity regulation
FK50 / ... ... N + TK ... K
Designation Item No. Item No.
Specialaccessory12V 08703 08708
Specialaccessory24V 08704 08709
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atatime(capacity
regulationapprox.33%).Tworetrotkitsarerequiredforacapacityregulationofapprox.66%.
Ascrew-inoptionisprovidedforthesensorelementonthehotgassideofthecompressor
housing(seeChap.9).Connectthethermalprotectionthermostatinserieswiththecontrolline.
TechnicalData:
Switchingvoltagemax. : 24VDC
Switchingcurrentmax. : 2.5Aat24VDC
Switch-offtemperature : 145°C±5K
Switch-ontemperature : approx.115°C
7.2 Thermal protection thermostat (Item No. 07595)
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,(corre-
sponds to 100 % compressor capacity).
Cylinder covers for capacity regulation are marked with the
designation "CR" (Capacity Regulator).