83003702.K Operating Instruction
Type KPC 108-L-U/S
page 25
\\FILER02\ALLGEMEIN\02 - TECHNISCHE UNTERLAGEN KKT\ORIGINALE\830XXX BEDIENUNGSANLEITUNGEN\KPC\83003702.K KPC108- L-US.DOC
9
Operating instructions
9.1
Switching ON the Industrial Cooler
The cooling medium circulation must be completely filled and all air must be removed.
Turn the “main switch” switch “ON” - to the position “1”
(For additional information about the switch settings please see chapter 3.8 “Swithch settings of main chiller functions
(exfactory settings).
Turn the control switch “ON” this means to “Automatik” if the remote control panel is installed otherwise to position
“HAND”.
The cold water pump starts.
The flow switch protection cuts off the compressor during start-up, if the water circuit has not enough water pressure.
The pressure on the pump supply side rises directly with the system pressure. If not: – the plant has either a leak or
insufficient cooling medium.
A flow switch acts to prevent freezing of the evaporator if and when water volumes drop.
The compressor switches on when the water becomes to warm.
The refrigeration compressor keeps running as long as cooling is required and the reference value for the water
temperature has not been reached. The fine adjustment is performed by hot gas by-pass solenoid valve.
The cooling medium pump remains in constant operation.
The compressor is switched off during circulation in cases of low or high pressure in the refrigerant circuit (fault
massage), or when the cooling is not required (normal).
When switched off in the normal way, the overload protection provides the compressor restart switching lag.
9.2
High/low pressure control
The high-pressure pressostat reacts by shutting off the compressor, when the refrigerant pressure after compressor is
higher then 19 bar.
Cause of this include - failure of condenser fans,
- high outdoor temperatures,
- a dirty condenser heat exchanger.
The compressor can only be put back in operation when the pressure has dropped and the reset switch on the high
pressure pressostat is activated.
An automatic start has not been provided for you have to do a reset on the high – pressure pressostat.
The low-pressure pressostat reacts by shutting off the compressor, when the refrigerant pressure before compressor
sinks to the magnitude mentioned in test report (Settings, Low-pressure-switch, different).
When the pressure rises to high enough, the compressor will switch on again automatically.
The start-up switching lag amount to the adjusted value in the testreport.
