Airedale Ultima Compact FreeCool 30kW - 450kW - Manual (Page 60)

ULTIMA COMPACT FREECOOL Chillers
60
Chillers
Technical Manual : 6259576 V1.2.0_02__2013
Installation Data
WATER SYSTEM
Component
Recommended
Requirements The recommended requirements to allow commissioning to be carried out correctly are:

The inclusion of Binder Points adjacent to the flow and return connections, to allow
temperature and pressure readings

A flow switch or equivalent, fitted adjacent to the water outlet side of the Chiller

A water-flow commissioning valve set fitted to the system

In multiple chiller installations, 1 commissioning valve set is required per chiller

Air vents are to be installed at all high points and where air is likely to be trapped at
intermediate points

Drain points are to be installed at all low points in the system and in particular
adjacent to the unit for maintenance to be carried out

Isolating valves should be installed adjacent to all major items of equipment for ease
of maintenance

Balancing valves can be installed if required to aid correct system balancing

All chilled water pipework must be insulated and vapour sealed to
avoid condensation

If several units are installed in parallel adjacent to each other, reverse return should
be applied to avoid unnecessary balancing valves
Pump Statement When installing circulating water pumps or equipment containing them, the following rules
should be applied:

Ensure the system is filled with water then vented and the pump primed with water
before running the pump, this is required because the pumped liquid cools the pump
bearings and mechanical seal faces

To avoid cavitation the NPSH (Net Positive Suction Head) incorporating a safety
margin of 0.5m head must be available at the pump inlet during operation
Interlocks & Protection Always electrically interlock the operation of the chiller with the pump controls for
safety reasons.
CAUTION Failure to will invalidate the chiller warranty.
Do not rely solely on the BMS to protect the chiller against low flow conditions.
An evaporator pump interlock MUST be directly wired to the chiller, refer to
Interconnecting Wiring , on page 61
ELECTRICAL
General

As standard the equipment is designed for 400V, 3 phase, 3 wire 50Hz and a
separate permanent 230V, 1 phase, 50Hz supply, to all relevant IEE regulations,
British standards and IEC requirements

The control voltage to the interlocks is 24V, always size the low voltage interlock and
protection cabling for a maximum voltage drop of 2V

Avoid large voltage drops on cable runs, particularly low voltage wiring
CAUTION A fused and isolated electrical supply of the appropriate phase, frequency and
voltage should be installed.
Wires should be capable of carrying the maximum load current under non-fault
conditions at the stipulated voltage.
A separately fused, locally isolated, permanent single phase and neutral supply
MUST BE FITTED for the compressor oil heater, evaporator trace heating and
control circuits, FAILURE to do so will INVALIDATE WARRANTY.
To reduce down time, if possible support the above supply with a UPS.
ALL work MUST be carried out by technically trained competent personnel.
Ensure correct phase rotation.
Refer also to Interlocks & Protection , above.