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6. FILLING AND COMMISSIONING
6.1. Check that the expansion vessel charge pressure is 0.15 or
0.3 MPa.
6.2. Check that all water and electric connections are correctly
configured.
6.3. Open the main stopcock and fill the unit. Open successive hot
taps starting with the tap furthest from the heater. Leave each tap
open for a few moments to allow all air and debris from the system
to exit. Close all of the taps.
6.4. Turn off the mains water supply to the cylinder and drain the
system through the drain cock.
6.5. Refill the cylinder with hot taps open and close when water
flows freely.
6.6. Manually lift (by rotating the knob) both the expansion relief
and the temperature and pressure relief valves for a short period
to remove trapped air from behind the valve seating and to check
the correct function of the discharge arrangement.
6.7. Check all joints for leaks and rectify as necessary.
6.8. With the heater full of water, switch on the electricity supply.
Check that the cylinder heats the water and the thermostat operates.
Turn on the hot taps to check that warm water is delivered.
6.9. Check that while the unit is heating up, no water exits from
either the expansion relief valve or the temperature and pressure
relief valve. If water does exit through the valves check the
expansion vessel pressure and installation.
6.10. Increase the temperature to maximum and allow the unit to
heat and the temperature to stabilise. Check that no water discharg-
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