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9
Maintenance
9.1 MAINTENANCE REQUIREMENTS
To ensure the continued optimum performance of the Megaflo Solar 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 Heatrae Sadia Megaflo Solar spare
parts. It is recommended that maintenance is carried out every 12 months and includes the
checks detailed in 9.2 and 9.3 below.
In hard water areas consideration should be given to periodically descaling the immersion
heater elements. To do this the Megaflo Solar unit will need to be drained, 9.4 and 9.5
detail how to drain the unit and remove the immersion heater(s).
9.2 CHECK OPERATION OF SAFETY VALVES
Slowly open the Temperature and Pressure Relief Valve by twisting its cap for a few sec-
onds. 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 Expansion Relief Valve (located on the Cold Water Combina-
tion Valve or Expansion Valve Core Unit).
9.3 CLEAN THE STRAINER
The strainer is incorporated within the Pressure Reducing Valve housing of the Cold Water
Combination Valve (see Diagram 2). To inspect and clean the strainer:
i)
Turn off the isolating valve on the Cold Water Combination Valve by turning the black
handle so it lies 90
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 (see diagram 16).
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.
9.4 DRAINING THE MEGAFLO SOLAR 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 Solar 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 Solar to relieve the system pressure. Open drain cock. If water fails
to drain from the Megaflo Solar vent the unit by manually opening the Temperature/Pres-
sure Relief Valve.
to the direction of flow.
o
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