Installation and operating instruction
Gas condensing unit WTC-GB 15-B Compact and WTC-GB 25-B Compact
6 Operation
83309302 1/2018-05 La
91-196
6.6.7.5 Combustion chamber pressure
Service WTC
Combustion
chamber
pressure
The parameter Combustion chamber pressure can be used to determine the differ-
ential pressure of the heat exchanger.
During service, the parameter is used for diagnostic purposes.
The combustion chamber pressure test nipple is required to carry out the measure-
ment (Order No. 481 000 00 72 2).
Select parameter
10.5.1.4 input H1
Set function to
Heat exchanger Emergency-Off
.
If the input is taken, disconnect plug H1 / H2 if necessary.
An automatic start is avoided.
Burner lockout function activated
is displayed.
Connect measuring device
Switch off system using switch S1 [ch. 5.7].
Remove front panel.
Completely remove the ionisation electrode, also unplug it from the circuit board.
Fit test nipple
1
.
Connect pressure inlet (+) to test nipple
1
.
Connect vacuum input (–) to the flue gas test point
2
and seal up.
Open inspection opening on flue gas system.
Draught conditions of the flue gas system have no influence on the measure-
ment.
1
2