MEGAFLO Eco SolaReady, Product Manual

M

AINTENANCE

37

Maintenance

Maintenance requirements
To ensure the continued optimum performance of the Megaflo Eco SolaReady 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 Megaflo Eco SolaReady 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 SolaReady 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 33, 
page 43). To inspect and clean the strainer:
 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 main stop cock to the house.
Open the lowest hot tap in the system to relieve the system pressure.
 Using a spanner unscrew the pressure reducing cartridge and remove the moulded housing. The strainer will be removed with 
the cartridge.
Wash any particulate matter from the strainer under clean running water.
Replace the strainer and screw the Pressure Reducing Valve cartridge into the moulded housing.
 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 SolaReady 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 SolaReady 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 SolaReady to relieve the system pressure. Open drain cock. If water fails to drain from the Megaflo 
Eco SolaReady vent the unit by manually opening the Temperature / Pressure Relief Valve.

Descaling immersion heater(s)
Open the cover(s) to the immersion heater housing(s) and disconnect wiring from immersion heater(s). Disconnect the two 
wires to the element tabs. 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 
SolaReady 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 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 into 
the corresponding terminations on the element.
Rewire the immersion heater(s) in accordance with Figure 14, page 17 or Figure 15, page 18. Close and secure terminal cover(s).

Expansion Vessel Charge Pressure
Remove the dust cap from the top of the expansion vessel.  Check the charge pressure using a tyre pressure gauge. 
The charge pressure (with the system depressurised) should be 0.3MPa (3 bar). If it is lower than the required setting it should 
be re-charged using a tyre pump (schrader valve type).  DO NOT OVER CHARGE.  Re-check the pressure and when correct 
replace the dust cap.

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 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 hot tap and then open successive hot taps in 
system to purge any air. The electrical supply can now be switched on.