Velux TFF 200, Инструкция по применению

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13 VELUX
SECTION I: TANK INSTALLATION SECTION I: TANK INSTALLATION
8. Maintainance
8.1 Requirements
To ensure the continued optimum performance of the
VELUX Solar Hot Water unit 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 VELUX spare parts. It is
8.2 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.
8.3 Draining the VELUX Unit
Switch off the electrical supply to the immer-
sion heater(s) and shut down the boiler on
indirect units.
Turn off the mains water supply to
the VELUX 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
8.4 Descaling Immersion Heather
Open the cover(s) to the immersion heater housing(s)
and disconnect wiring from immersion heater(s).
Remove the thermostat and unscrew the immersion
heater. Carefully remove any scale from the surface
of the element(s). DO NOT use a sharp implement as
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
if fitted. To do this the VELUX unit will need to be
drained.
Note: The water discharged may be very hot.
Repeat the procedure for the Expansion Relief Valve
(located on the Cold Water Combination Valve or
Expansion Valve Core Unit).
one metre below the unit is recommended. Open hot
water tap nearest to the VELUX unit to relieve the
system pressure. Open drain cock. If water fails to
drain from the VELUX Unit vent the unit by manu-
ally opening the Temperature/Pressure Relief Valve.
damage to the element surface could be caused. En-
sure sealing surfaces are clean and seals are undam-
aged; if in doubt fit a new gasket. Replace immersion
heater. Rewire the immersion heater(s) in accordance
with instructions and close and secure terminal cover.