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9. Filling and commissioning
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9.1.Check that the expansion vessel charge pressure is 3 bar.
9.2.Check that all connections are made tight including the immersion heater.
9.3.Open the main stopcock and fill the secondary system first. Open successive taps (hot and
cold) starting with the tap furthest from the cylinder. Leave each tap open for a few moments to
allow all air and possibly debris from the system to exit. Manually lift (by rotating the knob)
both the expansion relief (EV) and the temperature and pressure relief valve (TPV) for a short
period to remove trapped air from behind the valve seating and to prove the correct function of
the discharge arrangement.
9.4. Check all joints for leaks, rectify as necessary.
9.5. Check that the control and high limit settings for the indirect system and the immersion
heater are as required.
9.6. Fill the primary side, (note:- it will be necessary to manually open the 2 port valve whilst
filling the system, this is achieved by moving the lever on the valve head sideways). Check for
leaks and rectify as necessary. Vent all heat emitters of air and, following the manufacturers
lighting instructions, ignite the boiler.
9.7. Check that while the cylinder is heating up, no water issues from either the expansion relief
or the temperature and pressure relief valve and, when the cylinder reaches temperature, that the
2 port valve closes.
