Testing The Gas Supply Pressure; Measure Gas/Air Ratio - Bosch Worcester GB162-50 V2 Installation, Commissioning And Servicing Instructions

▶ Remove condensate sump.
Fig. 90 Removing the condensate sump
▶ Clean the condensate sump.
▶ Check the gasket between the condensate sump and heat exchanger
for damage and replace if necessary.
▶ Place the condensate sump under the heat exchanger.
▶ Push the condensate sump completely up to the heat exchanger.
▶ Close the snap fasteners.
▶ Reinsert all components in the reverse order.
▶ Bring the boiler into operation.
▶ Check the various gaskets at the condensate sump during operation
for flue gas and condensate leaks.
11.8

Testing the gas supply pressure

See chapter 8.7"Testing the gas supply pressure".
11.9

Measure gas/air ratio

▶ Take the boiler out of operation.
▶ Close the gas isolation valve.
▶ Undo the pressure test nipple nozzle [1] by turning it through
2 revolutions.
Fig. 91 Opening the burner pressure test nipple (50-V2 and 65-V2)
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Fig. 92 Opening the burner pressure test nipple (85-V2 and 100-V2)
▶ Connect pressure gauge.
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▶ Set pressure gauge to "0".
Hold the pressure gauge at the same height when the measurement
is in progress.
▶ Open the gas isolation valve.
▶ Bring the boiler into operation.
▶ Make sure that the boiler can dissipate the heat generated.
▶ Start the chimney sweep mode ( Chapter 7.3).
▶ Set the lowest possible output value (partial load).
▶ Measure the gas/air ratio.
This differential pressure must be between -10 and 0 Pa (-0.10 and
0.00 mbar) at minimum load. The nominal differential pressure is -5 Pa
(-0.05 mbar).
▶ Remove the cap of the adjusting screw.
▶ Set the gas/air ratio to -5 Pa (-0.05 mbar).
1
Fig. 93 Setting the gas/air ratio (50-V2 and 65-V2)
[1] Cap
[2] Differential pressure incorrect
[3] Differential pressure correct
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Inspection and servicing
1
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1
-5 Pa
3
-10 Pa
2
-15 Pa
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3
0 Pa
2
5 Pa
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