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Maintenance
Maintenance requirements
To ensure the continued optimum performance of the MEGAFLO Eco it should be regularly maintained. This is of particular importance in
hard water areas or where the water supply contains particulate matter. Maintenance should be carried out by a competent person and any
replacement parts used should be authorised MEGALO Eco spare parts. It is recommended that maintenance is carried out every 12 months and
includes the checks detailed below.
In hard water areas consideration should be given to periodically descaling the immersion heater elements. To do this the MEGAFLO Eco unit will
need to be drained, details below list how to drain the unit and remove the immersion heater(s).
Check operation of Safety Valves
Slowly open the Temperature and Pressure Relief Valve by twisting its cap for a few seconds. Check water is discharged and that it flows freely
through the tundish and discharge pipework. Check valve reseats correctly when released.
NOTE: The water discharged may be very hot.
Repeat the procedure for the 8 bar Pressure Relief Valve.
Clean the strainer
The strainer is incorporated within the Pressure Reducing Valve housing of the Cold Water Combination Valve (see Figure 17, p.31). To inspect and
clean the strainer:
i) Turn off the isolating valve on the 3 bar Pressure Reducing Valve by turning the blue handle (if fitted in this position) so it lies 90º to the direction
of flow or the main stop cock to the house.
ii) Open the lowest hot tap in the system to relieve the system pressure.
iii) Using a spanner unscrew the Pressure Reducing Cartridge and remove the moulded housing. The strainer will be removed with the cartridge.
iv) Wash any particulate matter from the strainer under clean running water.
v) Replace the strainer and screw the Pressure Reducing Valve Cartridge into the moulded housing.
vi) Close hot tap, turn on isolating valve by turning handle so it lies parallel to the direction of flow. Check for leaks.
Draining the MEGAFLO Eco unit
Switch off the electrical supply to the immersion heater(s) and shut down the boiler on indirect units. Turn off the mains water supply
to the MEGAFLO Eco unit. 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 hot water tap nearest to the MEGAFLO Eco to relieve the system pressure.
Open drain cock. If water fails to drain from the MEGAFLO Eco vent the unit manually by opening the Temperature and Pressure Relief Valve.
Descaling immersion heater(s)
Open the cover(s) to the immersion heater housing(s) and disconnect wiring from immersion heater(s). Remove the thermostat capillaries, 2 or
4 depending on which unit being serviced. Unscrew immersion heater backnut(s) and remove immersion heater from the unit. A key spanner is
supplied with the MEGAFLO Eco unit for easy removal and 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 shafted 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(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 gasket.
Replace immersion heater(s) ensuring the lower (right angled) element hangs vertically downwards towards the base of the unit. It may be helpful
to support the immersion heater using a round shafted screwdriver inserted into one of the thermostat pockets whilst the backnut is tightened.
Replace the thermostat(s) by carefully plugging the two male spade terminations on the underside of the thermostat head into the corresponding
terminations on the element.
Rewire the immersion heater(s) in accordance with Figure 12, p.20 or Figure 15, p.23. Close and secure terminal cover(s).
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 hot tap open, turn on the mains water supply. 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 the hot tap and then open successive hot taps in system to purge any air. The electrical
supply can now be switched on.
Benchmark
TM
On completion of any maintenance or service of the MEGAFLO Eco, the Benchmark
TM
“Installation, Commissioning and Service Record” should
be filled in to record the actions taken and the date the work was undertaken.
MAINTENANCE AND
SERVICING (3)
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