Checking The Static Pressure And Supply Pressure - Viessmann VITODENS 100-W Installation And Service Instructions Manual

Checking the static pressure and supply pressure

Danger
CO formation as a result of incorrect burner
adjustment can have serious health implications.
Check the CO content before and after carrying
out work on gas appliances.
Operation with LPG
Purge the LPG tank twice on commissioning or
replacement. Vent the tank and gas connection line
thoroughly after purging.
A
Fig. 21
1. Close the gas shut-off valve.
2. Undo screw A inside test connector "IN" on the
gas train but do not remove it, and connect the
pressure gauge.
3. Open the gas shut-off valve.
4. Check the static pressure.
Set value:
■ Natural gas: 20 mbar (2.0 kPa)
LPG: 37 mbar (3.7 kPa)
■
Supply pressure (flow pressure)
For natural gas
Below 10 mbar (1.0 kPa)
10 to 33 mbar
(1.0 to 3.3 kPa)
Above 33 mbar (3.3 kPa)
For LPG
Below 25 mbar (2.5 kPa)
25 to 57.5 mbar
(2.5 to 5.75 kPa)
Above 57.5 mbar
(5.75 kPa)
Commissioning, inspection, maintenance
5. Start the boiler.
Note
During commissioning, the appliance can enter a
fault state because of airlocks in the gas line. After
approx. 5 s, tap and hold "R" for approx. 2 s to
reset the burner.
Ensure that enough heat is being drawn during the
testing and setting processes.
6. Check the supply (flow) pressure.
Set value: see type plate.
Note
Use a suitable tester with a resolution of at least
0.1 mbar (10 Pa) to check the supply pressure.
7. Implement measures as indicated in the table
below.
8. Shut down the boiler, close the gas shut-off valve,
remove the pressure gauge and close test connec-
tor with the screw.
A
9. 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
Note
The maximum pressure drop between the gas shut-off
valve and test connector
0.5 mbar (50 Pa).
Steps
Do not commission the boiler. Notify the gas supply util-
ity or LPG supplier.
Start the boiler.
Connect a separate gas pressure governor upstream of
the system and set it to the nominal pressure (see type
plate). Notify the gas supply utility or LPG supplier.
A
at the gas train is
A
.
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