Fig 4
WARNING: THIS APPLIANCE MUST BE EARTHED.
8. Filling and commissioning-
8.1. Check that the expansion vessel charge pressure is 3 bar.
8.2. Check that all water and electric connections are tight and correctly configured.
8.3. 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.
8.4 Turn off the mains water supply to the cylinder and drain the system through the drain cock.
8.5 Refill the cylinder with hot taps open and close when water flows freely.
8.6 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 prove the
correct function of the discharge arrangement.
8.7. Check all joints for leaks and rectify as necessary.
8.8. With the heater full of water, turn the thermostat to a point just below its mid point setting and
switch on the electricity supply. Check that the cylinder heats the water and the thermostat operates
when the set temperature is reached. Turn on the hot taps to check that warm water is delivered to the
8.9 Check that while the unit is heating up, no water exits from either the expansion relief or the
temperature and pressure relief valve. If water does exit through the valves check the expansion vessel
pressure and installation.
8.10 Increase the temperature to maximum and allow the unit to heat and the temperature to stabilise.
Check that no water discharges from the valves. Turn on the hot taps to drain the heater of hot water.
Set the thermostat to the required temperature and allow the heater to reheat ready for use.
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