COMMISSIONING INSTRUCTIONS
TR05A153.B1107
40
When the pressure has been checked:
•
Switch off the appliance and close the gas supply isolation valve;
•
Disconnect the pressure gauge then reopen the isolation valve.
If the measured pressure does not equal that stated on data plate, or if it is more than 1 mbar less than the working
pressure at the meter, check the gas supply pipe work. Confirm that the pipe work is correctly sized and that there
is no blockage.
5.6.2 Mechanical minimum gas pressure
The minimum gas pressure for this appliance has been
factory set. Nonetheless, it must be checked to confirm
that it corresponds to the value stated on the boiler data
plate and in Section 5.8.
Once the boiler has been successfully fired (to eliminate
all air from the gas supply line):
•
Switch the appliance on, select Heating Only Mode,
then
switch the appliance off
(see Section 3.6);
•
Connect a pressure gauge to pressure point
B
of the
gas valve (see Figure 37);
•
Switch the appliance on.
The boiler will operate at the minimum gas pressure for
10 seconds prior to the burner ignition sequence. Check
that the pressure measured on the gauge is equal to the
minimum gas pressure stated on the boiler data plate.
If the measured pressure does not equal that stated on
the data plate:
•
Adjust the minimum gas pressure by turning screw
D
on the gas valve using a screw driver;
•
Switch the appliance off
before disconnecting the
pressure gauge.
5.6.3 Mechanical maximum gas pressure
The maximum gas pressure for this appliance has been factory set. Nonetheless, it must be checked to confirm
that it corresponds to the value stated on the boiler data plate and in Section 5.8.
Once the boiler has been successfully fired (to eliminate all air from the gas supply line):
•
Switch the appliance off
(see Section 3.6);
•
Connect a pressure gauge to pressure point
B
of the gas valve (see Figure 37);
•
Operate the appliance at maximum gas rate as described in Section 5.6.1;
Check that the maximum gas pressure is equal to the value stated on the boiler data plate.
If the measured pressure does not equal that stated on the data plate:
•
Remove plug
A
on the gas valve and adjust the maximum gas pressure by turning the screw underneath the
plug using a screw driver;
•
Switch the appliance off
before disconnecting the pressure gauge.
5.6.4 Maximum and minimum CH gas pressures
The minimum CH gas pressure for this appliance has been factory set and should not need to be adjusted.
However, it can be adjusted using Control Parameter 10 (see Section 5.6).
In order to maximise appliance efficiency and minimise noise, it is essential to match the appliance maximum CH
output to the heating demand of the system.
This is achieved by limiting the maximum CH gas pressure using Control Parameter 11 (see Section 5.6) and
following the instruction below.
Fig. 1
D
B
10
20
30
40
A
MANOMETRO
C
Figure 37: Burner gas pressure adjustment
