6
Central Heating System Pressure
1. The water pressure in the central heating
system is indicated by the pressure gauge.
2. With the system cold and the boiler not
operating the pressure should be between 0.5 and
1.0 bar. During operation the pressure should not
exceed 2.5 bar, and will normally be between 1.0
and 2.0 (Figs. 8 & 9).
3. A pressure of 3 or greater indicates a fault. The
safety pressure relief valve will operate, at a
pressure of 3 (Fig. 10).
It is important that your
Installer or Service Engineer is contacted as
soon as possible.
4. The minimum pressure for correct operation is
0.5. If the pressure falls below 0.5, this may
indicate a leak on the central heating system (Fig.
11).
To Shut Off the Boiler
1.
For short periods:
Turn the selector switch to
the OFF position (Fig. 12).
2.
For long periods:
Turn off the selector switch
(Fig. 12), electricity and gas supplies.
If your home is to be left unoccupied for long
periods during cold weather the boiler and
whole system should be drained unless
equipped with frost protection.
3. Your installer will advise you about frost
protection and draining the system.
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 (if fitted) will require
resetting once the selector switch is set to
either Position (i) or Position (ii).
2
1
0
4
3
bar
2
1
0
4
3
bar
2
1
0
4
3
bar
2
1
0
4
3
bar
ON/OFF/RESET
Selector Switch
Reset
OFF Position
Fig. 12
Normal Pressure (when cold)
Normal Pressure (operating)
Fig. 8
Fault
Fig. 9
Below Minimum
Fig. 10
Fig. 11
Pressure Gauge
