41
13.4.5
GAS PRESSURE ADJUSTMENT
1.
After the burner has operated for approximately 10 minutes, switch off the equipment.
2.
Open the pressure test point on the inlet side of the gas valve, attach a manometer and check the
standing gas-inlet pressure. See
Figure 12.3
or
12.4
for location.
3.
Relight the appliance and check the operating gas-inlet pressure.
NOTE:
The equipment has been designed to conform to the requirements of the Gas Appliance (Safety)
Regulations (1992). For Natural Gas the gas pressure governor control system is configured for a
nominal gas inlet pressure of 20 mbar, with a maximum inlet pressure of 25 mbar. Information relating
to propane firing can be found in
Section 13: LPG FUEL
.
4.
Switch off the appliance, remove manometer and close pressure test point.
5.
Open the pressure test point on the outlet side of the gas valve and attach a manometer.
6.
Relight the appliance and check the burner pressure according to the model.
7.
If required, the burner pressure can be corrected by removing the dust cap with a large slotted
screwdriver and the adjusting screw turned clockwise to increase burner pressure or counter-clockwise
to decrease burner pressure. Details of the correct burner pressure can be found in
Table 3.1.
NOTE:
If the dust cap is removed, once reinstalled it should be marked with an anti-tamper indicator.
8.
Carry out a combustion analysis.
Record all readings for future reference on a relevant
commissioning sheet.
FIGURE 12.3
GAS VALVES
ADJUSTMENT SCREW
OUTLET TEST POINT
INLET TEST POINT
ADJUSTMENT SCREW
INLET TEST POINT
OUTLET TEST POINT
LBF81/121
LBF151 - 401
Summary of Contents for LBF121
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