Airedale OptiChill FreeCool 500kW - 1365kW - Manual (Page 67)

Chillers OPTICHILL
™
Chillers
67
Technical Manual : 6530166 V1.6.0 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 unit Chiller

A 20 mesh strainer fitted prior to the evaporator inlet

A water-flow commissioning valve set fitted to the system

In multiple chiller installations, 1 commissioning valve set is required per chiller

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 liquid 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 and flow
proving device for safety reasons.
CAUTION Failure to install safety devices will invalidate the chiller warranty.
CAUTION Do not rely solely on the BMS to protect the chiller against low flow conditions.
An evaporator pump interlock and flow proving device MUST be directly wired to
the chiller, to
Interconnecting wiring diagram.