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COMMISSIONING
34
TO FILL AND TURN ON THE WATER HEATER
The power supply to the solar storage tank and solar control unit must not be
switched on until the water heater is filled with water and a satisfactory megger
reading is obtained.
Open all of the hot water taps in the house (don’t forget the shower). Open the
cold water isolation valve fully to the water heater. Air will be forced out of the
taps. As water flows freely from each tap, close it. Check the piping for leaks.
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Bleed the solar collectors (refer to “Bleeding the Solar Collectors” on page 34).
Switch on the electrical supply at the isolating switch to the solar storage tank.
Plug in the solar control unit and switch the power on.
Explain to the householder the functions and operation of the solar water heater.
BLEEDING THE SOLAR COLLECTORS
Upon completion of the installation, it is necessary to purge the air from the
collector circuit. To purge air from the collector circuit:
· Ensure the solar storage tank is full of
water and all of the hot taps are turned
off.
· Using a flat blade screwdriver, open
the bleed valve fitted adjacent to the
5 way tee at the cold water inlet of the
water heater (see diagram).
· The mains pressure will force water to
flow from the tank and through the
pipe work, forcing air from the collector
circuit through the bleed valve. This is
evidenced by spurting of water from
the drain line connected to the bleed
valve.
air bleed valve
Warning: Exercise caution, as water may be at a very high temperature.
· Close the bleed valve when water runs freely from the drain line.