Check The Gas Inlet Pressure; Checking Flue Integrity - Worcester GREENSTAR 24i Junior Installation Instructions Manual

SERVICE AND SPARES
6.2

CHECK THE GAS INLET PRESSURE

Refer to section 5.6.1 for more information
NOTICE:
B Ensure that the gas inlet pressure is
satisfactory with all other gas appliances
working.
B Do not continue with the other checks if
the correct gas inlet pressure can not be
achieved.
B Check the gas supply working pressures in the system
conform to the readings shown in the table below:
Natural gas
Allowed mbar pressure drop
meter/ across boiler
regulator pipework inlet
19 - 23 1 18-22
L.P.G.
32 - 45 2.5 29.5 - 42.5
mbar range
44
across gas control
boiler valve
1.5 16.5 - 20.5
1.5 28 - 41
6.3

CHECKING FLUE INTEGRITY

The integrity of the flue system and performance of the
boiler can be checked via the flue turret sample points.
Flue gas sample point
Air inlet sample point
Tab. 23 Key to figure 69
2
1
6720643895-67.1Wo
Fig. 69 Flue test points
B With the boiler case on and the boiler running at
maximum.
B Insert the analyser probe into the air intake test point.
B Allow the readings to stabilise and check that:
– O is equal to, or greater than 20.6%
2
– CO is less than 0.2%
2
B If the readings are outside these limits then this
indicates that there is a problem with the flue system
or combustion circuit.
Fig. 70 Flue integrity test
6 720 644 741a (2010/10)
1
2
1
2
1
2