Airedale UCFC 125 [17/46] Ultima compact freecool chillers

ULTIMA COMPACT FREECOOL Chillers

Chillers

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

Installation Data

WATER SYSTEM

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.

Pump Statement

• 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.

When all the pipework has been connected in the system, proceed as follows:

• Ensure all shut off and control valves are fully open.

• Pressurise system to the operating pressure, hold for 1 hour (a gradual fall in

pressure shown on the gauge indicates a leak).

• Leaks should be found and repaired and the unit pressure tested for a further hour.

Pressure Testing

When the pressure remains at the operating pressure for 1 hour, the system can be

considered leak free.

CAUTION

Although a pressure of 1.5 x working pressure is adequate for testing purposes,

most local water authorities require 2 x working pressure.

Filling

The whole system MUST be flushed prior to filling to remove debris left in the water

pipework by using a flushing bypass as shown to avoid serious damage to the

plate evaporator.

During filling the system should be vented at all high points.

Once the system has been completely vented all vents should be closed.

To prevent air locking in the system it is advisable to fill the systems from the lowest

point, ie drain point on pipework.

CAUTION

If auto air vents are used then we strongly recommend an auto pressurisation unit be

fitted to the system.