Operating Instruction
Healthcare chiller of the KSC Series
Version „Revision 09“
Type KSC 215-L-U/S
page 8von138
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Safety pack for the cooling circuit, consisting of:
Crankcase heater, high pressure pressostat as well as protective motor relay.
Shut-off ball valve at the cold water / ethylene-glycol entry, dirt absorber, expansion tank, feeder and safety
valve. High-pressure centrifugal-pump adjusted to the overall system, filling and drainage valve with automatic,
ventilation, manometer in forward and reverse flow. Quantity balancing-valve, overflow valve with connection
piece for computer terminal in cold water / AFN exit.
Temperature control as hot gas by-pass control with one regulating solenoid valves for each circuit.
The supply temperature of the water circuit is controlled by a Siemens SPS.
Additionally there is an connections to the MR for signals “run” and several faults
Condenser pressure control via pressure transmitter in the cooling circuit and frequency inverter, overload relay
for system safety.
Internal cold water / ethylene-glycol (AFN) piping made of Cu-pipe, brazed, with diffusion sealer, surrounded by
armaflex insulation.
All necessary block and clip angles used for cooling and cold water / ethylene-glycol(AFN) construction are
made of rust-proof and powder-coated material.
Switch-cabinet integrated in cooling block, system of protection IP 54, wired according to VDE-regulations with
a main switch, supply-check indicator lamp, phase monitoring relay and Siemens components such as,
overload release, sliding-panel, motor safety-switch, control-switch and indicator lamps.
A pump post-relay for the safety of the vaporizer as well as pot. proof contacts for "supply-control" and
"collective fault messages".
The switch cabinet of the outdoor version contains a switch cabinet heater and a mechanical switch cabinet
ventilator.
All parts described above are assembled into a ready-to-connect unit.
2.1
Functional description
The cold water pump starts as soon as the master switch 5Q1 have been turned from “OFF” to “ON”.
The pump main switch should only to be turned to “On” when the aqueous medium circuit has been completely
filled and all air has been removed.
The flow switch protecting of the refrigerating compressors is cut off during start-up.
The pressure on the delivery side of the pump rises directly with the system pressure.
Should this fail to be in case the plant has either a leak or insufficient water. A flow switch acts to prevent
freezing of the evaporator when water volumes drop. The refrigerating machines switch on as soon as the
safety sequence, flow switch and control motor-protection pump is in order.
