7.1.1 Check soundness of gas valve train
Soundness test
▶
Carry out soundness test:
▪
prior to commissioning,
▪
after all service and maintenance work.
▶
Switch off system.
▶
Close gas isolating valve.
▶
Open screw on test point Pe
1
of the gas pressure switch.
▶
Connect test equipment to Pe.
▶
Generate test pressure of 100 … 150 mbar.
▶
Wait for pressure equalisation for 5 minutes.
▶
Initiate a test period of 5 minutes.
▶
Check pressure loss.
✓
The gas section is sound, if the pressure does not drop by more than 1 mbar.
DANGER
Risk of explosion due to leaking gas
Improper work can lead to escaping gas and explosions.
▶
Tightly close screws after working on the test points of the gas combi valve.
▶
Document result of the soundness test on the engineers report.
Installation and operating instruction
Gas condensing boiler WTC-GB 90-A
7 Commissioning
83266502 • 1/2010-08 • La
53-95
