Main Combi 30 HE Manual del usuario - Página 7

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Fig. 4

Fig. 5

Fig. 6

Fig. 7

Central Heating

Temperature Control

bar

Normal Pressure

bar

Requires

Repressurising

bar

Fault

Domestic Hot Water

Fig. 8

Temperature Control

4.0 System Pressure & Temperature

4.1

Central Heating System Pressure

1. The normal operating water pressure is between 1 and 2.5

bar (Fig. 4). If the pressure exceeds 3 bar the safety pressure

valve will operate and a fault is indicated (Fig. 6). Contact your

installer.

2. It may be necessary to repressurise the system occasionally

(Fig. 5). A filling device (the filling loop) will be fitted on the

system. If you are unsure of its position, or cannot identify it,

consult the installer who fitted the boiler.

3. The filling loop will probably consist of two taps and a

separate metal braided hose with connection fittings.

4. Only when repressurising should the hose be connected

between the two taps. Ensure that the nuts on the pipe ends

are tightened onto the taps.

5. Fully open one of the taps first, and then while watching the

pressure gauge, carefully open the second tap.

6. When the needle on the gauge is indicating 1 or more turn

both taps off.

7. Disconnect the metal braided hose from the taps (a small

amount of water may be present) and remove it. Keep the

hose in a safe place for future use.

4.2

Temperature Control

1. Central Heating: The central heating hot water flow

temperature can be adjusted between 35° C (± 5° C)

minimum and 85° C (± 5° C) maximum.

2. Turn the control knob clockwise to increase the

temperature (Fig. 7). In normal winter usage we recommend

that the central heating temperature be set at maximum.

3. Domestic Hot Water: The temperature of the domestic

hot water can be adjusted by turning the control knob

clockwise to increase up to a maximum of 65° C (Fig. 8).

4. The temperature of the water is also dependent on the

water flow rate and the temperature of the mains coming into

the house.

5. By slightly reducing the flow from the tap the temperature

will increase up to the maximum if required.

6. The flow rate can be reduced down to as low as 2.5

litre/min. The boiler will still recognise the need to heat the

water.