Initial Start-up, Inspection and Maintenance
48
Steps
(continued)
4. Measure static pressure and running pressure (continued)
S
ervice
Start-up and Maintenance
Running pressure
8.
All measurements must be made
under high fire conditions
.
Measure the running pressure; value
must be:
Use suitable measuring instruments
calibrated with a minimum resolution
of 0.04 “w.c. for measuring the
running pressure.
Running supply pressure with
Corrective action
Natural gas
H
under 4 ”w.c.
Do not attempt adjustment. Call local
gas utility to increase pressure.
H
4 to 14 “w.c.
Start up boiler.
over 14 ”w.c.
Do not attempt adjustment. Call local
gas utility to decrease pressure.
Boiler valve must not be exposed to
pressure 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
and all gas
connections are gas-tight.
5
5
8
1
7
7
5
1
.3
Measuring running gas supply pressure,
using test nipple
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.
WARNING
