MEGAFLO 400L Product Manual - page 22
Unvented Hot Water Cylinder
22
MAINTENANCE AND
SER
VICING (3)
Maintenance
Maintenance requirements
To ensure the continued optimum performance of the MEGAFLO Eco Plus 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 Plus 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 de scaling the immersion heater elements. To do this the MEGAFLO Eco Plus 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 pipe work. 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 4, Page 11). To inspect and clean
the strainer:
i) Turn off the isolating valve to the 3.5 Bar Pressure Reducing Valve 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 Plus 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 Plus 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 Plus to relieve the system pressure. Open drain
cock. If water fails to drain from the MEGAFLO Eco Plus vent the unit by manually opening the Temperature / Pressure Relief Valve.
De-scaling immersion heater(s)
After making sure the electrical supply has been switched off and the cylinder drained down remove the cover to the immersion heater and disconnect the
power cable. With a suitable tool unscrew the immersion from the housing. Take care of the “O” ring on the immersion housing and replace if worn.
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.
To refit the element make sure the housing is clean and free from any contamination, screw the element in, taking care not to damage the “O” ring. If
more than one element has been removed repeat the operation until all elements have be replaced. Refill the cylinder and check for leaks. Rewire the
elements as per Fig 12, page19. Close and secure terminal cover(s).
Note:
If the cylinder needs to be inspected internally this can be done via the immersion heater boss.
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.
Benchmark
TM
On completion of any maintenance or service of the MEGAFLO Eco Plus, the Benchmark
TM
“Installation, Commissioning and Service Record” should be
filled in to record the actions taken and the date the work was undertaken.