Supplied By www.heating spares.co Tel. 0161 620 6677
6.5
6.6
6.7
SETTING THE SYSTEM DESIGN
PRESSURE
The design pressure must be a min. 1 bar
and max. 1.5 bar. These figures are read
off the pressure gauge.
- The actual reading should ideally be 1
bar + the height in metres to the highest
point of the system above the base of
the appliance (up to a max of 1.5 bar).
N.B.: The safety valve is set to lift a 3
bars (30 mt/42.5 psig).
- If external controls are installed (e.g.
timeclock and thermostat) make sure
that they call for heat.
- Press summer/winter selector switch la
Fig. 50 to winter.
Fig. 46
- To lower the system pressure to the
required value remove drain point (Fig.
93) or drain on the heating circuit.
FILLING THE HOT WATER SYSTEM
Close all hot water draw-off taps.
Open the cold water inlet cock.
Slowly open each draw-off tap until clear
water is discharged.
LIGHTING THE BOILER (Fig. 50)
Before lighting the main burner make sure
that the heating circuit flow and return
valves are open and also that the cold
water input cock is also open.
ELECTRICAL CONNECTION
Fig. 48
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