Check Flue Gas Non-Return Valve - Bosch Worcester GB162-50 V2 Installation, Commissioning And Servicing Instructions

Inspection and servicing
1
Fig. 94 Setting the gas/air ratio (85-V2 and 100-V2)
[1] Cap
[2] Differential pressure incorrect
[3] Differential pressure correct
▶ Enter the measurement in the maintenance protocol
( Chapter 11.15, page 43).
▶ Switch off the chimney sweep mode.
▶ Take the boiler out of operation.
▶ Close the gas isolation valve.
▶ Remove the pressure gauge.
▶ Close the test nipple.
▶ Replace the cap on the adjusting screw.
▶ Open the gas isolation valve.
▶ Bring the boiler into operation.
11.10 Measure CO/CO content
2
See chapter 8.9 "Measure the CO and CO

11.11 Check flue gas non-return valve

If the boiler has been installed within an overpressure flue cascade
system, the flue gas non-return valve must be checked.
▶ Open the inspection aperture [1] of the flue gas turret.
▶ Check the flue gas non-return valve [2] for wear, damage or soiling
and replace if necessary.
▶ Close the inspection aperture of the flue gas non-return valve.
Fig. 95 Checking the flue gas non-return valve
[1] Inspection aperture
[2] Flue gas non-return valve
42
-5 Pa
3
3
-10 Pa
0 Pa
2
2
6 720 807 034-071.1DDC
content".
2
1
2
6 720 807 034-68.1TD
11.12 Measure ionisation current
See chapter 8.10"Measure ionisation current".
11.13 Testing for gas leaks
See chapter 8.11"Testing for gas leaks".
11.14 Check for correct operating characteristics
▶ Check all fittings for leaks.
▶ Check the system pressure of the boiler and top up if necessary.
In doing so, take the water quality into account ( Chapter 3.2).
▶ Check the boiler settings ( Chapter 7.2"Setup menu").
▶ Replace the front casing and tighten the retaining screws.
6720814332 (2018/04)