Bedienungsanleitung Worcester-Bosch Greenstar Heatslave II Internal (Seite 8 von 16) (Englisch)

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Using your boiler

Greenstar Heatslave II 2022+ – 6 721 843 979 (2022/01)

3.2.7 Frost protection

▶ The boiler has built in frost protection to protect the boiler,

the boiler must have power for this to operate.

▶ If you are leaving the property unoccupied during cold

weather, please leave your programmer on constant and

your room thermostat set to around 10 to 15°C.

▶ If the temperature within the boiler falls below 8°C the

pump will run to circulate water and prevent the system

freezing.

▶ If the temperature within the boiler falls below 4.5°C the

boiler will fire immediately, bringing the boiler temperature

up to 12°C to avoid the possibility of the system freezing.

▶ This process will be repeated until such time that the boiler

temperature does not drop below 4.5°C.

3.2.8 System pressure

This boiler is fitted to a sealed heating system which is pre-

pressurised. Your installer will advise you of the minimum and

maximum pressure indicated on the pressure gauge.

▶ Check regularly that the pressure is maintained.

Fig. 5

Optimum system pressure when your boiler is cold (area A) and

the pump is off. The indicated pressure will change as the pump

switches on, for more accurate readings check pressure when

the pump is not running.

▶ If the pressure gauge reads less than 1 bar then the system

requires re-charging.

– Check for leaks on heating system (pipe work and

radiator valves).

▶ Contact your installer or maintenance engineer if a

permanent significant decrease or increase in pressure is

indicated on the pressure gauge.

– Constantly having to re-pressuring the heating system

should be investigated as the concentration of inhibitor

in the system will be reduced; this can result in

corrosion within the heating system.

Filling loop

If the sealed system pressure within your system drops to

below 0.5 bar (shown on the pressure gauge) you will need to

increase the pressure to ensure your boiler continues to run

without problems.

Once the external filling loop has been located, follow the

instructions for re-pressurising the system.

1. Unscrew blanking cap.

2. Attach the hose to the valves, screw on hand-tight.

3. Turn the handle/screwdriver slot through 90° to open

valves.

4. The handle/screwdriver slot will be in line with the valves.

5. When the pressure reaches between the 1 and 1.5 bar

marks (zone A), turn the handles/screwdriver slots back,

through 90°, to close the valves.

6. The handle/screwdriver slot will be at 90° to the valves.

7. Remove the hose and replace the blanking caps.

Fig. 6

6 720 805 211-06.1TL

Your installer should have informed you where

to find the filling system and instructed you in

its use.

6 720 805 211-06.1TL

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