Pressure Gauge; Central Heating System Pressure; To Shut Off The Boiler; Frost Protection Mode - Potterton Performa System HE User Manual

Pressure Gauge

2
bar
Fig. 13
Normal Pressure (when cold)
2
bar
Fig. 14
Normal Pressure (operating)
2
bar
Fig. 15
Fault
2
bar
Fig. 16
Below Minimum
On/Off
Selector Switch
Reset
Fig. 17
Off Position
8

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 0.2 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.
13 & 14).
3. A pressure of 3 or greater indicates a fault. The
safety pressure relief valve will operate, at a pressure
of 3 (Fig. 15). It is important that your Installer or
Service Engineer is contacted as soon as
possible.
4. The minimum pressure for correct operation is 0.2.
If the pressure falls below 0.2, this may indicate a
leak on the central heating system (Fig. 16).

To Shut Off the Boiler

1. For short periods: Turn the selector switch to the
Off position (Fig. 17).
2. For long periods: Turn off the selector switch
(Fig.17), 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 there is
additional 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.

Frost Protection Mode

1. The frost protection feature will operate when the
selector switch is in the On position.
The gas and electrical supplies to the boiler must be
on and then system pressure be within the range
described above.
2. If the system temperature falls below 5°C, then the
boiler will fire until the water temperature has been
raised.
3. Further frost protection can be incorporated by
using a frost thermostat to protect the whole system.
Publication No. 5111818