36
Series 49
Installation, Operating & Service Instructions
111368-04 - 1/22
18. Check gas Inlet pressure
A. While boiler and all other gas appliances
are not firing, gas inlet pressure should not
exceed ½ psig.
B. While boiler and all other gas appliances
are firing, gas inlet pressure must be
between minimum and maximum shown
on rating label.
19. Check gas outlet (manifold) pressure
A. Install manometer on 1/8" outlet pressure
tap on gas valve (see Figure 9-3). Use
of shutoff valve between manometer and gas
valve can prevent pressure surge that blows
out manometer fluid.
B. Adjust regulator on gas valve so manifold
pressure matches values listed on rating label.
C. Turning regulator adjustment screw
clockwise (
) increases pressure.
D. Turning regulator adjustment screw
counterclockwise (
) decreases pressure.
20. Check gas input rate to boiler
A. When checking rate, ensure all other
appliances connected to same meter as
boiler are off.
B. Do not exceed input rate shown on rating
label (up to 2,000 ft.)
21. Measure carbon monoxide (CO) level in vent after
5 minutes of main burner operation. CO should
not exceed 200 ppm air free.
22. Test thermostat operation while boiler is running.
Turn thermostat to lowest setting. Both pilot and
main burners should stop firing. Raise thermostat
back to highest setting. Pilot and main burners
should relight.
23. Verify auto reset LWCO operation while boiler is
running. Slowly open drain valve and drain boiler
until water level drops below auto reset LWCO
line. Water should be visible in gauge glass when
auto reset LWCO shuts down both pilot and main
burners. Make sure auto reset pressure limit,
thermostat or other controls have not shut off
boiler. Upon test completion refill boiler to NWL.
Pilot and main burners should relight.
24. Check auto reset pressure limit operation. When
steam pressure is registered on pressure
gauge, lower auto reset pressure limit setting
(
MAIN
) below gauge reading. Both pilot and main
burners should stop firing. Raise operating auto
reset pressure limit setting (
MAIN
) above gauge
reading. Pilot and main burners should relight.
Return to settings prescribed in step 6 of this
section.
25. After boiler has operated for approximately 30
minutes, check boiler and heating system piping
for leaks. Repair leaks at once.
26. Inspect vent system for flue gas leaks. Repair
leaks found before leaving boiler in operation.
27. Replacement of a steam boiler tends to break
loose accumulated scale from system. After new
boiler has been installed and put into continuous
operation for several days, clean boiler of oil,
grease, sludge, and other contaminants that may
have been present in existing piping. This will
prevent unsteady water line and water carry over
into supply main. Skim boiler per Appendix A.
10
System Start-Up and Checkout
(continued)
WARNING
Failure to follow the following procedure exactly could result in over firing of boiler and a carbon monoxide
hazard.
!
