47
3062547_201802
29 Cascade operation - Flue gas
damper tightness test
Tightness test on
connections to adjacent
appliances
As part of the annual heating appliance inspection, the cascade
damper on overpressure boiler systems must be tested for tightness,
to ensure no flue gas can escape into the boiler room. Flue gas can
lead to asphyxiation or severe to life-threatening poisoning.
The check must be carried out with the appliance closed.
Tightness test on connections to adjacent appliances
- Set the program selector (l.h. rotary selector) to "Standby" on the BM
programming unit.
- Then turn the first COB to position 1 "Emissions test" by means of the heating
water temperature selector
è
COB starts.
- Operate the first COB for at least 5 minutes.
- Check the CO
2
content in the air connectors on all other appliances:
- If the CO
2
value exceeds 0.2% within 15 minutes, the leak must be found and
remedied.
- Subsequently close all test apertures again. When doing so, ensure the caps are
seated firmly.
Testing the first COB for tightness
- Turn the temperature selector for heating water on the first COB to its centre
position
è
COB shuts down.
- The turn the second COB to position 1 "Emissions test" by means of the heating
water temperature selector
è
COB starts.
- Operate the second COB for at least 5 minutes.
- Carry out the CO
2
test on the first COB.
- If the CO
2
value exceeds 0.2% within 15 minutes, the leak must be found and
remedied.
- Subsequently close all test apertures again. When doing so, ensure the caps are
seated firmly.
1
2
3
4
1. ON
OFF
OFF
OFF
2. OFF
ON
OFF
OFF
Summary of Contents for COB
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