Function Sequence And Possible Faults - Viessmann VITODENS 111-W Installation And Service Instructions Manual

Checking the static pressure and supply pressure
08. Check the supply (flow) pressure. For set values,
see the following table.
Note
Use a suitable measuring device with a resolution
of at least 0.1 mbar (0.01 kPa) to check the supply
pressure.
09. Record the value in the report.
Implement measures as indicated in the table
below.
10. Shut down the boiler. Close the gas shut-off valve.
Remove the pressure gauge. Close test connector
B with the screw.
Supply pressure (flow pressure)
For natural gas
< 13 mbar (1.3 kPa)
13 to 25 mbar (1.3 to
2.5 kPa)
> 25 mbar (2.5 kPa)

Function sequence and possible faults

Control unit issues a heat
demand
Yes
Fan starts
Yes
Ignition
Yes
Gas solenoid valve opens
For LPG
< 25 mbar (2.5 kPa)
25 to 57.5 mbar (2.5 to
5.75 kPa)
> 57.5 mbar (5.75 kPa)
Display
No
No Fault 59, 457
No
Fault 359
No Fault 357
Commissioning, inspection, maintenance
(cont.)
11. Open the gas shut-off valve and start the appli-
ance.
Danger
Gas escaping from the test connector leads
to a risk of explosion.
Check gas tightness at test connector
12. Fit cover panel .
A
13. Fit front panel (see installation sequence).
Measures
Do not start the boiler. Notify the gas supply utility or
LPG supplier.
Start the boiler.
Install a separate gas pressure governor upstream of
the system. Set the pre-charge pressure to 20 mbar
(2.0 kPa) for natural gas and 50 mbar (5.0 kPa) for
LPG. Notify the gas supply utility or LPG supplier.
Measure
Increase set value. Ensure
heat transfer.
Check the fan connecting ca-
bles. Check the fan power
supply.
Check ignition module (con-
trol voltage 230 V across
plug "X1/54" terminals "L"
and "N" on the HBMU).
Check the gas supply.
Check the gas supply pres-
sure.
.
B
43