Airedale Ultima Compact FreeCool 30kW - 450kW - Manual (Page 42)

ULTIMA COMPACT Chillers
42
Chillers
Technical Manual : Part No 6259543 TM E_1.3.0 04/2013
Installation Data
WATER SYSTEM Chilled water pipework and ancillary components must be installed in accordance with:

National and Local Water supply company standards.

The manufacturer's instructions are followed when fitting ancillary components.

The system water is treated to prevent corrosion and algae forming.

In ambients of 0°C and below, where static water can be expected, or when water
supply temperatures of +5°C or below is required, the necessary concentration of
Glycol or use of an electrical trace heater must be included.

The schematic is referred to as a guide to ancillary recommendations.
CAUTION The unit water connections are NOT designed to support external pipework,
pipework should be supported during installation.
The water flow commissioning valve set is not shown in the diagram, as the valve can be
fitted elsewhere within the chilled water circuit.
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.
CAUTION Constant water flow MUST be maintained. Variable water volume is
NOT recommended and may invalidate warranty.
CAUTION The correct operation of the flow switch is critical if the chiller warranty is to
be valid.

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.

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 and water
flow switch for safety reasons. Failure to do this will invalidate the chiller warranty.
Do not rely solely on the BMS to protect the chiller against low flow conditions.
An evaporator pump interlock and flow switch MUST be directly wired to the
chiller, refer to
Interconnecting Wiring diagram.