4
Fig. 2. Water flow diagram.
7
6
1. CH flow
8. Expansion vessel
2. Domestic hot water flow
9. Primary heat exchanger
3. Mains cold water inlet
10. Expansion vessel charge point
4. CH return
11. Relief valve
5. Pressure relief valve discharge 12. Boiler drain point
6. Domestic water flow turbine
13. Charging link (optional extra)
7. Circulating pump
8
9
10
11
12
2.11.2 Domestic Hot Water:
The appliance can provide domestic hot water whenever it is
switched on electrically
.
A demand for hot water will light the burner. The pressure will
immediately rise to maximum. At the end of the demand the fan
will continue to run for 35 seconds if there is no heating
demand.
In winter it may be necessary to reduce the flow at the taps to
maintain the delivery temperature.
2.11.3 Domestic Hot Water and Central Heating:
The demand for hot water will override the central heating
function when the appliance is in the heating and hot water
mode of operation.
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1
2
5
3
4
