Checking The Static And Supply Pressure - Viessmann Vitodens 333 Service Instructions Manual

Further details regarding the individual steps
Yes
Gas combination
valve opens
Yes
Ionisation cur-
rent builds
(higher than
2 µA)
Symbol A
Yes
Burner starts No
For further details regarding faults, see page 69.

Checking the static and supply pressure

Danger
CO build-up as a result of incorrect burner setting can have serious
health implications.
Carry out a CO test prior to, and after, work on gas equipment.
Operation with LPG (only 26 kW)
Flush the LPG tank twice during commissioning/replacement. Thoroughly vent
the tank and gas lines after flushing.
Initial start-up, inspection, maintenance
Fault F4
No
Fault F4
No
Stops below set
boiler water tem-
perature and re-
starts immedi-
ately
(cont.)
Check the gas
combination valve
(control voltage
230 V); check the
gas supply pres-
sure
Check ionisation
current, check
electrode adjust-
ment and gas
pipe for airlocks.
Check flue gas
system sound-
ness (flue gas re-
circulation),
check gas flow
pressure
13