Heatrae Sadia Hotflo 10 Fitting Instructions And User Manual page 12

6.4 SAFETY VALVES
The Pressure (Expansion) Relief Valve and, if fitted, the Temperature/Pressure
Relief Valve should be operated regularly to remove lime deposits and to verify
that it is not blocked. Manually operate the valves by either twisting the cap or
lifting the lever. Ensure water flows freely from the valve(s) and through the
discharge pipes. Ensure the valve(s) reseat correctly when released.
6.5 EXPANSION VESSEL PRESSURE
6.5.1 The Expansion Vessel, if fitted, should have a precharge pressure of
4.1 bar (60 p.s.i.). This can reduce over time and eventually require
re-charging. To do this:
6.5.2 Turn off water supply to the unit; open a hot tap to relieve system
pressure.
6.5.3 Remove dust cap from top of Expansion Vessel
6.5.4 Check pre-charge pressure using a tyre pressure gauge. If the pressure
is lower than 4.1 bar (60 p.s.i.) it should be recharged using a tyre pump
(Schraeder Valve type). DO NOT OVER CHARGE.
6.5.5 Re-check pressure and when correct replace dust cap.
6.5.6 Turn on mains water supply and close hot tap.
6.6 SUPPLY CORD
If the supply cord is damaged the water heater should be switched off until
the supply cord can be replaced by a competent electrician or a Heateam
Engineer in order to avoid a hazard.
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