Gas Valve Leakage Test; Measuring The Ionisation Current; Measuring The Gas Inlet Pressure (Working Pressure); Checking And Adjusting The Gas/Air-Ratio - Worcester GB162-65 Installation And Servicing Instruction

INSPECTION
B Replace any pipes that have corroded.
B Carry out a visual inspection of the burner, heat
exchanger, condensate trap, automatic air vent and
all fittings in the boiler.

12.4 GAS VALVE LEAKAGE TEST

Check the internal tightness of the gas fitting on the
input side (with the boiler switched off) at a test
pressure of 20 mbar for natural gas.
B Open the screw plug on the testing nipple for the gas
connection by 2 turns.
B Connect the pressure gauge tube to the testing
nipple. The pressure drop allowed after one minute is
max. 10 mbar.
B If the pressure drop is higher, check all sealing
locations of the gas fitting for leaks using a foaming
product. Repeat the pressure test if no leaks are
found. Replace the gas fitting if the pressure drop is
higher than 10 mbar per minute again
( section 13.2.1 "Removing the gas valve" on
page 64 for instructions on how to remove).
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2
Fig. 103 Checking the gas fitting for internal tightness
12.5 MEASURING THE IONISATION
CURRENT
See section 10.2.11 "Measuring the ionisation current",
page 55.
12.6 MEASURING THE GAS INLET
PRESSURE (WORKING PRESSURE)
See section 10.2.6 "Measuring the gas inlet pressure
(working pressure)", page 51.
12.7 CHECKING AND ADJUSTING THE
GAS/AIR-RATIO
See section 10.2.7 "Checking and adjusting the gas/air-
ratio", page 52.
62
12.8 CARRYING OUT A LEAKAGE TEST IN
See section 10.2.8 "Carrying out a leakage test in
operating conditions", page 54.

12.9 MEASURING THE FLUE GASES CO

See section 10.2.9 "Measuring the flue gases CO2
emissions", page 55.

12.10 FILLING THE HEATING SYSTEM

See section 10.1 "Filling the heating system", page 47.
12.11 CHECKING THE FLUE GAS
See section 10.2.4 "Checking the flue gas connection",
page 51.
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OPERATING CONDITIONS

EMISSIONS

CONNECTION
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