Main Combi 24 HE Manuel de service télécharger pdf (Page 8)

3.0 Appliance Operation

3.1 Central Heating Mode (Fig. 2)

1. With a demand for heating, the pump circulates water

through the primary circuit.

2. Once main burner ignites the fan speed controls the gas

rate to maintain the heating temperature measured by the

temperature sensor.

3. When the flow temperature exceeds the setting

temperature, a 3 minute delay occurs before the burner

relights automatically (anti-cycling). The pump continues to

run during this period.

4. When the demand is satisfied the burner is extinguished

and the pump continues to run for a period of 3 minutes

(Pump Overrun).

3.2 Domestic Hot Water Mode (Fig. 3)

1. Priority is given to the domestic hot water supply. A

demand at a tap or shower will override any central heating

requirement.

2. The flow of water will operate the Hall Effect Sensor

which requests the 3 way valve to change position. This will

allow the pump to circulate the primary water through the

DHW plate heat exchanger.

3. The burner will light automatically and the temperature of

the domestic hot water is controlled by the temperature

sensor.

4. When the domestic hot water demand ceases the burner

will extinguish and the diverter valve will remain in the

domestic hot water mode, unless there is a demand for

central heating.

IMPORTANT: When the selector switch is in the ‘0’

(Off) position the electrical supply to the boiler is isolated.

The boiler will not operate and the integral timer will

require resetting once the selector switch is set to either

Position (i) or Position (ii).

3.3 Frost Protection Mode

1. The frost protection mode is integral to the appliance and

functions only with the selector switch (see Section 2.1) in

the domestic hot water and central heating position. If the

system temperature falls below 5° C then the boiler will fire

on its minimum setting until a flow temperature of 30° C is

reached. Further protection can be incorporated by using a

system frost thermostat.

3.4 Pump Protection

1. With the selector switch (see Section 2.1) in either the

central heating or central heating and domestic hot water

position, the pump will automatically operate for 1 minute in

every 24 hours to prevent sticking.

5 6

1213141516

1 Primary Heat Exchanger

2 Burner

3 Ignition Electrode

4 Flame Sensing Electrode

5 Gas Valve

6 Pump

7 Automatic Air Vent

8 Plate Heat Exchanger

9 Flow Sensor with Filter & Regulator

10 Pressure Relief Valve

11 Boiler Drain Point

12 Heating Return

13 Cold Water Inlet On/Off Valve and Filter

14 Gas Inlet

15 Domestic Hot Water Outlet

16 Heating Flow

17 Pressure Gauge

18 Water Pressure Sensor

19 Automatic By-Pass

20 Fan

21 Diverter Valve Assembly

22 Diverter Valve Motor

23 Domestic Hot Water Flow Temperature Sensor

24 Safety Thermostat

25 Central Heating Temperature Sensor

26 Expansion Vessel

Key

Central Heating Circuit

Domestic Hot Water Circuit

Fig. 3

5 6

1213141516

Fig. 2

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 55 56

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Main Combi 24 HE Manuel de service Page 8

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