Opening The Boiler Door; Carry Out A Visual Check For General Signs Of Corrosion; Gas Valve Leakage Test; Measuring The Ionisation Current - Worcester GB162-50 Installation And Servicing Instructions

DANGER:
Danger of fatal accident from explosive fumes.
▶ Only carry out work on gas pipes and fittings if you
are Gas Safe / ACS registered.
▶ Close the gas valve [1].
▶ Close the isolating valves[2].
1
2
Fig. 100 Closing the valves (here: in closed position)
12.2

Opening the boiler door

▶ Turn the vent key through a quarter rotation to undo the boiler door
lock ( detailed picture).
▶ Push the fastener down and open the boiler door.
If the boiler door cannot be swung open completely,
remove it ( section 13.1 "Removing the boiler door",
page 48).
Fig. 101 Opening the boiler door
12.3 Carry out a visual check for general signs of
corrosion
▶ Check all gas and water-bearing pipes for signs of corrosion and for
leaks.
▶ Replace any pipes that have corroded.
▶ Carry out a visual inspection of the burner, heat exchanger,
condensate trap, automatic air vent and all fittings in the boiler.
6720813171 (2015/04)
12.4
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.
▶ Open the screw plug on the testing nipple for the gas connection by
2 turns.
▶ Connect the pressure gauge tube to the testing nipple. The pressure
drop allowed after one minute is max. 10 mbar.
▶ 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 49 for instructions on how to remove).
2
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1
2
Fig. 102 Checking the gas fitting for internal tightness
12.5
See section 10.2.11 "Measuring the ionisation current", page 43.
12.6
See section 10.2.6 "Measuring the gas inlet pressure (working
pressure)", page 40.
12.7
See section 10.2.7 "Checking and adjusting the gas/air-ratio", page 41.
12.8
See section 10.2.8 "Carrying out a leakage test in operating conditions",
page 42.
12.9
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See section 10.2.9 "Measuring the flue gases CO2 emissions", page 43.

12.10 Filling the heating system

See section 10.1 "Filling the heating system", page 37.

12.11 Checking the flue gas connection

See section 10.2.4 "Checking the flue gas connection", page 40.

Gas valve leakage test

Measuring the ionisation current

Measuring the gas inlet pressure (working pressure)

Checking and adjusting the gas/air-ratio

Carrying out a leakage test in operating conditions

Measuring the flue gases CO
Inspection
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emissions
2
47