9
4.0 COMMISSIONING
4.1 PLUMBING
4.1.1 Do not switch on the electrical supply until the unit has been filled with
water and checked for leaks.
4.1.2 Check that all installation, electrical and discharge pipe requirements
have been met.
4.1.3 Check that all water and electrical connections are tight.
4.1.4 Open a hot water tap, turn on mains water supply to the heater.
4.1.5 Allow unit to fill and leave hot tap running for a short while to purge any
air and flush out the pipework. Close the hot tap and check the system
for leaks.
4.1.6 Manually test the operation of the Pressure (expansion) Relief Valve.
Ensure water flows freely from the valve and through the discharge
pipes.
4.2 ELECTRICAL
4.2.1 Switch on the electrical supply. The indicator light will illuminate during
heating. When the set temperature is reached, the indicator light will
go out.
4.2.2 The set temperature can be adjusted by rotating the knob on the
front face of the unit. Rotate clockwise to increase temperature, anti-
clockwise to reduce temperature. Setting 2 on the temperature control
knob equates to a water temperature of approx 45°C.
4.2.3 Water may drip from the discharge pipe of the pressure relief device
- this pipe must be left open to atmosphere.
