Function Sequence And Possible Faults - Viessmann Vitodens 200-W Installation And Service Instructions For Contractors

Commissioning, inspection, maintenance
Checking the static and supply pressure
1. Close the gas shut-off valve.
2. Undo screw inside test nipple "IN" on the gas
A
train but do not remove it, and connect the pressure
gauge.
3. Open the gas shut-off valve.
4. Check the static pressure and record the actual
value in the report on page 115.
Set value: max. 57.5 mbar (5.75 kPa).
5. Switch on mains voltage and start up the boiler.
Note
During commissioning, the boiler can enter a fault
state because of airlocks in the gas line. Fault EE
will then be displayed.After approx. 5 s, press reset
button R to reset the burner.
6. Check the supply (flow) pressure.
Set value:
Natural gas: 20 mbar (2 kPa)
■
LPG: 50 mbar (5 kPa)
■
Note
Use a suitable measuring instrument with a resolu-
tion of at least 0.1 mbar (0.01 kPa) to check the
supply pressure.
Supply pressure (flow pressure)
For natural gas
Below 17.4 mbar
(1.74 kPa)
17.4 to 25 mbar
(1.74 to 2.5 kPa)
Above 25 mbar (2.5 kPa)

Function sequence and possible faults

Control unit issues a heat
demand
Yes
Fan starts
26
For LPG
Below 42.5 mbar
(4.25 kPa)
42.5 to 57.5 mbar
(4.25 to 5.75 kPa)
Above 57.5 mbar
(5.75 kPa)
Display
No
No After approx. 51 s, fault F9
(cont.)
7. Record the actual value in the report on page 115.
Take action as shown in the following table.
8. Shut down the boiler, close the gas shut-off valve
and remove the pressure gauge. Close test port
with the screw.
9. Open the gas shut-off valve and start the appliance.
Danger
Gas escaping from the test nipple leads to a
risk of explosion.
Check gas tightness at test connector
Actions
Do not start the boiler. Notify your gas supply utility or
LPG supplier.
Start the boiler.
Install a separate gas pressure governor upstream of
the system and regulate the pre-charge pressure to
20 mbar (2.0 kPa) for natural gas or 50 mbar (5.0 kPa)
for LPG. Notify your gas supply utility or LPG supplier.
.
A
Action
Increase set value and en-
sure heat is drawn off
Check the fan, fan con-
necting cables, power at
the fan and fan control
A