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8: Installation - Maintenance
8.1 Maintenance Requirements
The Megalife solar has been designed and manufactured to require very little maintenance. However, to ensure
the continued optimum performance of the Megalife solar 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 solar spare parts.
In hard water areas consideration should be given to periodically descaling the immersion heater elements. To do
this the Megalife solar 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, shut down the auxillary boiler on indirect units and shut
down the solar primary circuit. Turn off the cold water supply to the Megalife solar 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)
Switch off the electrical supply prior to removing the control cover.
Open the cover(s) to the immersion heater housing and disconnect wiring from immersion heater. Remove the
thermostat capillaries by carefully pulling outwards from the immersion heater. (Note which order they are fitted).
Remove the terminal shroud. Unscrew immersion heater backnut(s) and remove immersion heater from the unit. A
key spanner is supplied with the Megalife solar unit for easy removal/tightening of the immersion heater(s). Over
time the immersion heater gasket may become stuck to the mating surface. To break the seal insert a round bladed
screwdriver into one of the pockets on the immersion heater and gently lever up and down.
Carefully remove any scale from the surface of the element. 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
gasket. Replace immersion heater ensuring the (right angled) element hangs vertically downwards towards the base
of the unit. It may be helpful to support the immersion heater using a round bladed screwdriver inserted into one
of the thermostat pockets whilst the backnut is tightened. Replace the terminal shroud. Replace the thermostat
capillaries into the capliilary pockets, taking care to put the curly tail capillary in first.
Rewire the immersion heater(s) in accordance with Fig. 05, page 9 . Check, close and secure terminal cover.
8.4 REFILLING SYSTEM
DO NOT switch on the immersion heater, auxillary boiler or solar primary circuit 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 emits 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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