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2. Operation and
Maintenance
Once CTC Hot Water Storage Tank has been installed, you and your installer
should together check that the system is in perfect operating condition. Let the
installer show you how the system works and how it should be maintained. Bleed
the radiators after approximately three days of operation and refill the water if
necessary.
Pressurise before filling the radiator system (surrounding water). The operating
pressure must not exceed the pressure indicated on the rating plate. A safety valve
must always be equipped.
Safety valve for tank and heating circuit
Check regularly that the valve is working properly by manually turning the valve
knob so that water comes out. Check that water is coming out of the overflow
pipe. The overflow pipe outlet must always be open. Hot water can drip from the
safety valve.
Regularly check all connections for any leaks (including peripheral equipment such as
the boiler, etc.).
Draining the tank
The tank must be disconnected from power when it is being drained. The drain
valve can be connected directly onto one of the lower connections, if one is free,
or to a low lying pipe. When draining the whole system, the mixing valve must be
fully open, i.e. turned anticlockwise as far as it will go. Air must be supplied to the
closed system.
Downtime
If there is a risk of the water freezing when the system is not in use, all the water
must be drained from the tank and the radiator system. The DHW coils, which
hold approx. 6 litres per coil, are emptied by feeding a hose all the way down the
cold water connections and then siphoning out the water.
Noise
Sudden pressure changes in the tap water system may cause noise. This is due
to pressure surges which occur when, for instance, an older type of single-lever
mixer is closed suddenly. The fault is not in the CTC Hot Water Storage Tank,
and the problem can be easily rectified by replacing the mixer with a soft-closing
one. If an unusual sound comes from hard-closing dishwasher and washing
machines, this can be remedied using a shock arrestor. A shock arrestor can also
be an alternative to soft-closing water taps. Minimising pressure surges benefits
the whole of the tap water system throughout the property.
If you hear a rasping sound from the product, check that it has been properly
bled. Turn the boiler safety valve so that any air can be evacuated. Top up with
water where required, so that the correct pressure is achieved. If this noise
recurs, call a technician to check the cause.
11
CTC AT. Hot Water Storage Tanks
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