Unit installation

In regards to the controls and their wiring, please ensure compliance to the following points to avoid Electro Magnetic

Interference and to optimise the efficiency of EMI filters:

• Make sure that the conducting area around board support holes on main, auxiliary and user boards are very well

grounded to the mounting plates through conducting studs, screws and metal spacers.

• Cables for transducers, sensors, user boards and serial lines must be wired far from high voltage lines like main

power and controls power.

• For shielded cables, connect the shield wire to the ground; exposed wire length must be 15 mm maximum.

Control wiring/cables connected to the control panel should never be run in the

same conduit with power wiring.

Some very important recommendations with regard to the main power switching On & Off to these chillers is as

follows. Failure to follow these recommendations could result in serious damage to the equipment:

Removing high voltage power (switching OFF the main disconnect) will

disable the 230VAC supply voltage to controls and the compressor crankcase

heaters. At initial start-up or after a prolonged power disconnection, the

crankcase heaters must be energized for a minimum of 12 hours (main

disconnect should be switched ON) before starting/operating the unit.

If the unit is located in an area where low ambient temperatures are

encountered, do not disconnect main power unless alternate means are

provided to assure operation of the cooler heater or the liquid system has been

drained completely.

After a prolonged power disconnections do not switch ON main power to the

unit unless power supply cables and unit control panel have been properly

inspected.

CAUTION

WARNING