Checking The Static Pressure And Supply Pressure - Viessmann B1HF Installation And Service Instructions Manual

Commissioning, inspection, maintenance

Checking the static pressure and supply pressure

Danger
CO formation as a result of incorrect burner
adjustment can have serious health implications.
Always carry out a CO test before and after
work on gas appliances.
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 MB, it should be checked to ensure that
the gas pressure is sufficient for correct and safe oper-
ation.
Taking into account a pressure drop from the installa-
tion lines of no more than 1 MB, it can be assumed
that a permissible minimum pressure of 18 MB is
present at the appliance's gas connection (reference
BS 6400-1 Section 6.2, Pressure absorption).
Fig. 26
40
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).
Observe minimum gas pressure at the gas fitting in
accordance with the table – see page 41
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. Undo screw
solenoid valve, but do not remove it. Connect the
pressure gauge.
04. Open the gas shut-off valve.
05. Measure the static pressure and record it in the
report.
Set value: Max. 57.5 mbar (5.75 kPa).
06. Turn on the ON/OFF switch and start the boiler.
Note
During commissioning, the appliance can enter a
A
fault state if there are airlocks in the gas line.
Reset the appliance after approx. 5 s (see operat-
ing instructions).
07. Measure the supply (flow) pressure. For set val-
ues, 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.
08. Record the measured value in the report.
Implement measures as indicated in the table
below.
09. Shut down the boiler. Close the gas shut-off valve.
Remove the pressure gauge. Close test
connector
inside test connector on the gas
A
with the screw.
A