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9.3 Check differential pressure at air pressure switch
Observe notes on servicing (see Ch. 9).
▶
Remove right side panel.
▶
Remove hoses from the test points
1
on the air pressure switch.
▶
Connect test equipment:
▪
+ to P1,
▪
- to P2.
During testing the maximum heating operation rating (parameter
37
) must be set
100
%.
▶
Switch on main switch.
▶
Check parameter
37
, if necessary set to
100
%.
▶
Manually drive to rating (see Ch. 6.4).
▶
Set rating to
70
%.
▶
Read differential pressure from measuring device.
If the pressure is above 1.2 mbar the test is ok.
If the pressure is lower:
▶
Check the following components:
▪
Hoses of the air pressure switch
▪
Burner tube for soiling
▪
Heat exchanger for soiling
▪
Air and flue gas ducting unimpeded
▶
If necessary reset parameter
37
after testing.
Installation and operating instruction
Gas condensing boiler WTC-GB 90-A
9 Servicing
83266502 • 1/2010-08 • La
64-95