INSTALLATION
16
MAINS WATER SUPPLY
Where the mains water supply pressure exceeds that shown in the table below, an approved pressure
limiting valve is required and should be fitted as shown in the installation diagram (refer to diagram on
page 31).
Expansion control valve setting *
Max. mains supply pressure
With expansion control valve
Without expansion control valve
Min. mains supply pressure
* Expansion control valve not supplied with the water heater.
TANK WATER SUPPLY
If the water heater is supplied with water from a tank supply and a minimum water supply pressure of
200 kPa at the water heater cannot be achieved, then a pressure pump system must be installed to allow the
heat pump circulator to operate and avoid air locks in the circuit. Care must be taken to avoid air locks. The
cold water line from the supply tank should be adequately sized and fitted with a full flow gate valve or ball
valve.
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