Maintenance
- the system is maintenance free but the status must be checked every
month. This can be done by checking the Pilot LED fitted into the control box.
• Pilot lamp green - mains voltage is present and the system is ready for operation
• Pilot lamp OFF - no mains voltage. Intervention required
• Pilot lamp flashing red - there is a fault. Intervention required. Refer to manufacturers
instructions.
16 Electrical connections for optional immersion heaters
Installation
- When fitting the immersion heater to the tank, ensure that the thermostat
or cut-out is located at the top of the element bundle and that there is sufficient room in
front of the tank to allow removal of the element. Check the immersion heater joint to
the tank ensuring that there are no leaks.
Wiring -
Prior to wiring up the immersion heater, check that the mains supply available
corresponds to the rating on the heater data plate and that the rating of any cables,
fuses and contactors are suitable for the electrical load and that an earth is connected
to the heater - refer to Fig 14.
Check that the thermostat safety cut-out is correctly wired to ensure complete shutdown
of the heater ie. in series with the coil of the main contactor.
Operation -
Ensure that the element is immersed in the water as this includes a
thermostat to sense the water temperature. In the event of a shutdown due to
overheating, the main isolator must be switched off before checking the system, the
water level should be checked and the system inspected. When satisfied, reset the
cutout.
Maintenance -
The immersion heater must be electrically isolated before removing the
terminal cover. Periodically inspect the element to check for any deposit build up on the
element.
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Operation
- the hot water system must be exercised at least every two months to
ensure that gas is not allowed to build up in the tank. The system must not be
disconnected from the mains electrical supply whilst the tank is full of water as this will
compromise the corrosion protection. This is particularly important during prolonged
shut down periods (holidays).
