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8
Maintenance
8.1 MAINTENANCE REQUIREMENTS
The MegaLife has been designed and manufactured to require very little maintenance. However, to
ensure the continued optimum performance of the MegaLife it should be periodically maintained. This
is of particular importance in hard water areas where limescale can build up on hot surfaces and
eventually affect the heating efficiency of either the immersion heater(s) or primary heating coil.
Maintenance should be carried out by a competent person and any replacement parts used should be
authorised Heatrae Sadia MegaLife spare parts.
In hard water areas consideration should be given to periodically descaling the immersion heater
elements. To do this the MegaLife unit will need to be drained, 8.2 and 8.3 below detail how to drain
the unit and remove the immersion heater(s).
8.2 DRAINING THE MEGALIFE UNIT
Switch off the electrical supply to the immersion heater(s) and shut down the boiler on
indirect units. Turn off the cold water supply to the MegaLife unit by shutting the service valve in
the cold water feed pipe from the feed cistern. Attach a hosepipe to the drain cock having sufficient
length to take water to a suitable discharge point below the level of the unit, at least one metre below
the unit is recommended. Open drain cock.
8.3 DESCALING IMMERSION HEATER(S)
Open the cover(s) to the immersion heater(s) and disconnect wiring from immersion heater(s). Un-
screw immersion heater(s) using an immersion heater box spanner.
Carefully remove any scale from the surface of the element(s). DO NOT use a sharp implement as
damage to the element surface could be caused. Ensure sealing surfaces are clean and seals are
undamaged, if in doubt fit a new 'o'-ring seal.
Replace immersion heater(s) and tighten using an immerion heater box spanner.
Rewire the immersion heater(s) in accordance with Diagram 3. Close and secure terminal cover(s).
8.4 REFILLING SYSTEM
DO NOT switch on the immersion heater(s) or boiler until the system has been completely refilled.
Close the drain tap. With the highest hot tap in the system open, turn on the service valve in the cold
water feed pipe. When water flows from the hot tap allow to flow for a short while to purge air and to
flush through any disturbed particles. Close hot tap and then open successive hot taps in system to
purge any air. The electrical supply can now be switched on.
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