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9.8 Check gas pressure switch
▶
Check setting of 13 mbar and adjust if necessary.
▶
Drive burner to 40 … 50 % of the rating.
▶
Slowly close gas isolating valve.
✓
The gas pressure drops.
The flue gas pressure switch functions correctly, if the burner switches off and the
display shows
W47
.
15
10
Installation and operating instruction
Gas condensing boiler WTC-GB 90-A
9 Servicing
83266502 • 1/2010-08 • La
70-95