Operating Instruction
Healthcare chiller of the KSC Series
Version „Revision 09“
Type KSC 215-L-U/S
page 9von138
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A lag in connection time has been allowed for in the refrigeration compressors to avoid surges in the current.
The refrigeration compressors keep running as long as cold is required and the reference value for the water
temperature has not been reached.
The water pump remains in constant operation.
Apart from which, the refrigerating machines are only ever switched off during circulation in cases of low or
high pressure in the refrigeration cycle.
When switched off in the normal way, a restart delay provides overload protection to the compressor.
The refrigerant circuits which starts first is changed after 24hours when the difference between the water
return and supply is smaller than 0,7K for a dedicated time .
2.1.1
High-/Low- pressure control
The high-pressure sensor shut off the compressor via SPS if the pressure rises up to 18,9bar.
In series the second compressor will run.
If the sensory high pressure control is not in function a high pressure pressostat is installed.
The high-pressure pressostat reacts to excess pressure of the magnitude of 19,2 bar
by shutting off the compressor.
Causes of this include
- failure of condenser fans,
- high outdoor temperatures,
- a dirty condenser.
The compressor can only be put back in operation when the reset switch is activated on the HP-pressure
control and the pressure has dropped.
An automatic start has not been provided for.
The low-pressure sensor also switches off the compressor when the pressure sinks to 0,5 bar. The sensor is
by-passed during start-up for 30 s.
Causes of this include
- defective Expansion valve,
- low outdoor temperatures,
- low level of refrigerant.
If the pressure rises to 1,0 bar, the compressor will switch on again automatically.
