Viessmann VITODENS 100-W WB1B Series Installation And Service Instructions Manual page 48

Initial Start-up, Inspection and Maintenance
Steps
(continued)
Start-up and Maintenance
Fig. 48 Measuring running gas supply
pressure, using test nipple A
48
4. Measure static pressure and running pressure (continued)
8. All measurements must be made
under high-fire conditions.
Measure the running pressure;
value must be:
Running supply Running supply
pressure with pressure with
Natural gas Liquid propane gas
under 4 "w.c. under 10 "w.c.
g g
4 to 14 "w.c. 10 to 14 "w.c.
g g
over 14 "w.c. over 14 "w.c.
g g
9. Enter gas type into Maintenance
Record on page 83 in this manual.
10. Switch off the heating system
on/off service switch (boiler is
shut down), close the gas shut-
off valve, remove the manometer
and re-tighten the screw in the
test nipple A.
11. Open gas shutoff valve and check
that the test nipple A and all gas
connections are gas-tight.
Use suitable measuring instruments
calibrated with a minimum
resolution of 0.04 "w.c. for
measuring the running pressure.
Corrective action
Do not attempt adjustment. Call
local gas utility to increase pressure.
Start up boiler.
Do not attempt adjustment.
Call local gas utility to decrease
pressure.
Boiler valve must not be exposed to
pressure over 14 "w.c.
WARNING
Ensure that there is no open flame
in the room.
WARNING
Never purge a gas line into a
combustion chamber. Never use
matches, candles, flame, or other
sources of ignition for purpose of
checking leakage. Use a soap-and-
water solution to check for leakage.
A failure to follow this warning
could result in fire, explosion,
personal injury, or death.