Airedale UCFC 125 [35/46] Ultima compact freecool chillers

ULTIMA COMPACT FREECOOL Chillers

Chillers

Installation & Maintenance : 903-132 IM E 06/05/A

Commissioning Data

OPERATIONAL SEQUENCE

Refrigerant Charge

Check for the presence of a refrigerant charge in the condenser side.

Sump Heater

The mains supply to the sump (oil) heater should be switched on at least 8 hours prior to

compressor starting to avoid refrigerant migration.

CAUTION

A separately fused, locally isolated, permanent single phase and neutral supply

MUST BE FITTED

for the compressor sump heater, evaporator trace heating and

control circuits, FAILURE to do so could INVALIDATE WARRANTY

Pre-Start-Up Check

Before compressor start-up, make sure that an oil level is showing in the compressor

sight glass, and that all refrigerant ball valves are opened.

CAUTION

Check phase rotation by connecting pressure gauges to the suction and

discharge ports, if no differential pressure occurs, isolate immediately.

Adding Refrigerant

The unit is supplied with a full refrigerant charge, additional refrigerant should be added to

the system via 1/4” schrader connection on the expansion line if required.

Pump Down

Never pump down without the low pressure trip and high discharge temperature switches

being operative.

UNLOADING PROTECTION

Head Pressure

The microprocessor has inbuilt protection against nuisance trips. If the head pressure

rises above 24Barg the system will unload 1 compressor and remain unloaded until the

head pressure drops below 17Barg.

Low Pressure

If low pressure drops below the microprocessor setting, the compressor will unload to 1

compressor, if low pressure persists for 1 minute, the circuit will be switched off and

sound an alarm.