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INSTALLATION – SOLAR STORAGE TANK
19
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 29).
Model 270
Relief valve setting 1000 kPa
Expansion control valve setting * 850 kPa
Max. mains supply pressure
With expansion control valve 680 kPa
Without expansion control valve 800 kPa
Min. mains supply pressure
140 kPa
* Expansion control valve not supplied with the water heater.
TANK WATER SUPPLY
If the water heater is supplied with water from a tank supply, then a pressure pump system is
recommended to ensure a minimum water pressure of 140 kPa is achieved to allow the gas booster to
operate. Take care to avoid air locks.
Notes:
• It is not recommended to install this water heater with a low pressure water supply.
• This water heater is not suitable for connection to bore water or spring water unless a water
treatment device is fitted.
• If sludge or foreign matter is present in the water supply, it is recommended a suitable filter be
incorporated in the cold water line to the water heater.
• Refer to “Water Supplies” on page 52.