Operation
9
Greenstar 2000 – 6 721 820 553 (2021/02)
CAUTION
Caution must be exercised when venting radiators or re-pressurising/
topping up the heating system:
▶ Do not vent air from radiators whilst the central heating is switched
on.
▶ Allow 30 minutes after venting the radiators before using central
heating or hot water.
▶ Whilst venting radiators, do not allow the pressure to drop below the
green zone on the boiler’s pressure gauge/reading.
If symptoms persist:
▶ Do not repeatedly vent your radiators.
▶ Contact a heating engineer.
4Operation
These operating instructions describe the operation of the gas-fired
condensing boiler. Therefore please also observe the operating
instructions for the user interface.
4.1 Switching on/off the appliance
Switching on
After initial power-up of the appliance, the appliance will initiate siphon
fill mode.
When and the flow temperature appear alternately on the display,
the appliance remains at minimum heat output for 15 minutes to fill the
condensate trap.
Switching off
NOTICE
Risk of damage to the system from frost!
The heating system can freeze after a prolonged period (e.g. during a
power failure, switching off the power supply, faulty fuel supply,
appliance fault etc.).
▶ Ensure that the heating system is in constant use (particularly when
there is a risk of frost).
Frost protection for the heating system is only ensured if the heating
pump is operational and is pumping heating water through the entire
system.
▶ Leave the heating switched on.
▶ Set the time control to constant ON and set the room thermostat to
12 °C.
The anti-seizing function is not active when the appliance is switched off.
The anti-seizing function prevents the heating pump and the diverter
valve from seizing up following long periods of inactivity.
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