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Initial Start-up, Inspection and Maintenance
Steps
(continued)
S
Start-up and Maintenance
ervice
Measuring running gas supply pressure,
using test nipple
48
4. Measure static pressure and running pressure (continued)
Running pressure
8. All measurements must be made
under high fire conditions.
Measure the running pressure; value
must be:
Running supply pressure with
Natural gas
Hunder 4 "w.c.
H4 to 14 "w.c.
over 14 "w.c.
9. Enter gas type into Maintenance
Record on page 74 in this manual.
10. Switch off the heating system
on/off service switch (boiler is shut
down), close the gas shutoff 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
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
and all gas
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.
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