83003702.K Operating Instruction
Type KPC 108-L-U/S
page 26
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9.3
Electronic controls
The control system consists of a 2-step controller. The reference value is set value see testreport for the outlet
temperature. The sensor for the controller is installed on the outlet side.
9.4
Regulating refrigerating capacity
The exact regulation of the leaving temperature is achieved by means of 2-step controllers and hot gas by-pass
injectors with solenoid valves. The setting is based on approx. 50% of each machine’s refrigerating capacity.
9.5
Condenser pressure regulation
the condenser-pressure is regulated with help of the Frequency Inverter.
– see caption “Frequency Inverter”
9.6
Safety functions to protect components of cooling water circuit
When the refrigerant cycle is failure the water pump heats up the cooling medium.
To prevent the components in the cooling circuit, there is a safety function which switches off the pump if the water
temperature is longer than 30 minutes over 30 °C.
When this function has worked, the lamp (7H3 – in switch gear) on the switch box lights and the water pump has
stopped.
The lamp is labelled “reset overheating water”.
When the problem in the refrigerant circuit is solved, you have to pull down the button “reset overheating water”. This
is the requirement that the pump can run again.
9.7
Collective alarm
The red warning lamp in the door of the switch box lights up when one of the safety sensors has been triggered. The
cause of the error can be identified more exactly by means of the LEDs in the switch box. For the purpose of external
evaluation of the error signal, the collective alarm message can be accessed, potential-free, from the terminal. (See
also circuit diagram)
9.8
Flow switch
Monitors the water flow volume through the evaporator and shuts the device down completely if the min. water
quantity is reached.
9.9
Dirt trap
The dirt trap is fully installed (see Shema in the appendix) and protects the evaporator from dirt.
As a matter of principle the plant is to be operated with clean water. With that regular servicing of the filter is
unnecessary.
Caution! Work on electric and refrigerant circuits should only be performed by qualified operatives.
Observe the safety rules!
