The SK2 series of compressors for CO2
subcritical applications has been developed taking into consideration the most recent requirements
coming from industrial refrigeration and from manufacturers of supermarket refrigeration systems. Thanks to high design pressures these
compressors can be installed in the most common cascade and booster systems with standstill pressures up to 60bar.
• 11 models optimised for refrigeration applications.
• 8 models also suitable for heat pumps as well as refrigeration applications.
• Maximum allowable pressures: discharge side ps
= 140bar, suction side ps
= 80bar.
• Suitable for operation with variable frequency drive.
• Model optimised for refrigeration applications are supplied with POE 85 oil; model
optimised for heat pumps are supplied with PAG 68 oil.
• The whole range is supplied with Kriwan protection module INT69® Diagnose.
• Discharge temperature sensor is supplied with all compressors.
• Water cooled head available for all models of S series.
• Integrated variable frequency drive available for all models of Q series.
Standard extent of delivery
TK range’s compressors are supplied complete with suction and discharge copper plated valves suitable for weld connections (discharge valve
suitable for steel pipe connection is available upon request), external pressure relief valve on both discharge and suction side, discharge temperature
sensor, vibration dampers, lubricant charge, nitrogen protective charge, oil level sight glass, electronic protection module Krivan INT69® Diagnose
Transcritical two-stage compressor
The new model Q9-5.3STK is a two-stage CO2 transcritical compressor designed to operate in a flash-gas by-pass cycle with one temperature
level or two different levels, medium and low temperature. At the evaporating temperature -30°C and discharge pressure 87bar, with gas
cooler outlet temperature 35°C, the compressor is able to provide a cooling capacity of about 8kW