7.4 Pump exercise programme
After a power cut or every 23 hour in frost protection mode the pump will run for one minute to
prevent it from sticking. This will also occur during normal operating if there is no demand for
more than 24 hours.
7.5 Final flush of the heating system (hot)
● Operate the appliance until the heating system is up to temperature.
● Check the heating system for leaks.
● Connect a hose to the drain valve located at the lowest position of the heating system.
● Shut off the appliance, open the drain valve and all bleed valves on the radiators and
allow the water to flow out of the heating system and the boiler quickly and fully.
● Close the drain valve.
● Fill the heating system again with water.
● If fitted to a sealed system. Release water from the system until the system design
pressure is attained. (The actual reading on the digital pressure gauge should ideally be
0.5 bar plus an additional pressure corresponding to the highest point of the system
above the base of the boiler 10 m head equals an additional 1 bar reading on the
pressure gauge. The minimum pressure should not be less than 1 bar in any
installation.) If the system is to be treated with an inhibitor it should be applied at this
stage in accordance with the manufacturer’s instructions (see section 3.16).
● Refit the boiler casing (see section 5.10)
7.6 Handing over to the user
NOTE:
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