COMMISSIONING
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33
B
If left in the Performance test mode the control will return to normal
operation after 15 minutes.
B
Close the gas isolation valve and remove the manometer.
B
Re-seal the screw in the gas inlet pressure test point.
B
Open the gas isolation valve and check for gas tightness.
GAS PRESSURE WITHIN THE SYSTEM
Refer to the figure below for natural gas pressures.
The pressure at the boiler must not be less than the pressure read at the
meter minus 1 mbar.
The pressure drop from the meter to the gas valve must not be more than
2.5 mbar for natural gas.
If the pressure drops are greater than shown in figure 41, then this
would indicate a problem with the pipe work or connections within the
system.
Fig. 41 Natural gas pressures
Refer to the figure below for L.P.G gas pressures.
The pressure at the boiler must not be less than the pressure read at the
meter minus 2.5 mbar.
The pressure drop from the meter to the gas valve must not be more than
4 mbar for LPG.
If the pressure drops are greater than shown in figure 42, then this
would indicate a problem with the pipe work or connections within the
system.
Fig. 42 L.P.G. pressures
5.5.2 CHECKING THE GAS RATE
B
The gas rate should be measured at the gas meter after 10 minutes
operation at maximum.
See technical data section at the front of this manual.
–
Press the Performance test button (J) for more than ten seconds
and set Central Heating temperature to maximum.
–
The Performance test button (J) will illuminate continually and the
display (C) will alternate between
and the central heating flow
temperature.
B
Where a gas meter is not available (e.g. L.P.G.) the CO/CO
2
must be
checked to the units shown in the setting of the air/gas ratio, refer to
section 6.2.
B
If pressure and gas rate are satisfactory press the Performance test
button again and the boiler will return to normal operation.
–
If left in the Performance test mode the control will return to normal
operation after 15 minutes.
B
Close the gas isolation valve.
B
Remove the manometer.
B
Re-seal the screw in the gas inlet pressure test point.
B
Open the gas isolation valve.
B
Ensure that there are no gas leaks.
B
Replace the outer case.
5.5.3 DOMESTIC HOT WATER:
Controlling the hot water temperature
B
The hot water temperature can be set to between approximately 40°C
and 60°C using the temperature control (H).
5.5.4 DOMESTIC HOT WATER PRE-HEAT:
Pre-heat reduces the time taken to produce hot water at the tap and is
controlled by the ECO button (F).
B
Press the ECO button to select either:
When the ECO button is
not illuminated
the boiler will be in pre-heat
mode (which will reduce the time taken to produce hot water at the tap).
OR
When the ECO button
is illuminated
the boiler will be in Economy mode
with pre-heat no longer active.
NOTICE:
Do not continue commissioning until the correct gas
pressure is achieved.
Meter
Boiler inlet
Gas Control
valve
19 - 23 mbar
18 - 22 mbar
16.5 - 20.5 mbar
1 mbar
drop
1.5 mbar
drop
Natural Gas
6720644744-44.1Wo
Gas Control
valve
L.P.G.
Regulator
Boiler inlet
32 - 45 mbar
29.5 - 42.5 mbar
28 - 41 mbar
2.5 mbar
drop
1.5 mbar
drop
6720644744-45.1Wo
