Viessmann Vitovalor PT2 Installation And Service Instructions For Contractors page 70

Commissioning, inspection, maintenance
Measuring connection pressure (flow pressure)
D
B
Fig. 65
01. Switch off the gas condensing boiler ON/OFF
switch.
02. Fold down heat management unit
page 42.
03. Remove cover panel
04. Close gas shut-off valve
05. Loosen the screw in test connector
train, do not unscrew. Connect the pressure
gauge.
06. Open gas shut-off valve
07. Switch on the gas condensing boiler ON/OFF
switch.
08. Check the supply (flow) pressure.
Set value: 20 mbar (2.0 kPa)
If the set value is exceeded, take steps according
to the table on page 71.
Note
Use a suitable measuring device with a resolution
of at least 0.1 mbar (0.01 kPa) to check the supply
pressure.
70
A
. See
A
.
B
.
C
on the gas
D
.
C
(cont.)
C
09. Record the actual value in the report on
page 162.
10. Shut down the appliance and close the gas shut-
off valve. Remove the pressure gauge and tighten
the screw in test connector
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 test connector
12. Fit cover panel
.
D
for gas tightness.
D
.
B