Checking The Static Pressure And Supply Pressure - Viessmann VITODENS 111-W Installation And Service Instructions Manual

Commissioning, inspection, maintenance

Checking the static pressure and supply pressure

C
A B
Fig. 25
Cover panel
A
Type plate
C
Gas installation to BS 6891:2005
It is the gas installer's responsibility to size the gas
installation lines in accordance with BS 6891:2005.
If it is determined that the operating pressure falls
below the minimum outlet level for the measuring
device of 19 mbar: Check and ensure that the gas
pressure is sufficient for correct and safe operation.
Operation with LPG
Purge the LPG tank twice on commissioning/replace-
ment. Vent the tank and gas connection line thoroughly
after purging.
01. Turn off the ON/OFF switch.
02. Close the gas shut-off valve.
03. Remove cover panel
04. Undo screw in the test connector on the gas
B
solenoid valve, but do not remove it. Connect the
pressure gauge.
05. Open the gas shut-off valve.
42
.
A
Danger
CO formation as a result of incorrect burner
adjustment can have serious health implications.
Carry out a CO test before and after work on
gas appliances.
Taking into account a pressure drop from the installa-
tion lines of no more than 1 mbar, it can be assumed
that a permissible minimum pressure of 18 mbar is
present at the appliance's gas connection (reference
BS 6400-1 Section 6.2, Pressure absorption).
The external gas tap may reduce operating pressure
further if measured at its test point. The pressure drop
is relative to the heat input of the boiler (kW).
06. Measure the static pressure and record it in the
report:
Max. 57.5 mbar (5.75 kPa).
07. Turn on the ON/OFF switch and start the boiler.
Note
During commissioning, the appliance can enter a
fault state if there are airlocks in the gas line.
Reset the appliance after approx. 5 s (see operat-
ing instructions).