Chapter 5 — Starting and Operating Instructions
5-16 Part No. 750-184
J. CONTROL OPERATIONAL TEST AND CHECKS
Proper operation of the various controls should be verified and
tested when the boiler is initially placed into service, or whenever a
control is replaced. Periodic checks should be made thereafter in
accordance with a planned maintenance program.
The operating limit control may be checked by allowing steam
pressure or water temperature to increase until the burner shuts
down. Depending upon the load, it may be necessary to manually
increase the firing rate to raise steam pressure to the burner shut off
point. If the load is heavy, the header valve can be closed or
throttled until the pressure increases. Observe the steam gauge to
check the cut off pressure as the operating limit control shuts the
burner down. Slowly open the header valve to release steam
pressure and check the cut-in setting as the burner restarts. Check
the modulating control for the desired operating pressure range. See
Chapter 6 for instructions on the adjustment of controls.
The water temperature on a hot water boiler that may be operating
at less than full load may be raised by manually increasing the firing
rate until the burner shuts down through the action of the operating
limit control. Observe the thermometer to verify the desired settings
at the point of cut-out and again when the burner restarts. Return
the manual automatic switch to “automatic” and check the
modulating control for the desired temperature range. See Chapter
6 for instructions on the adjustment of the controls.
Check the proper operation and setting of the low-water cutoff (and
pump operating control, if used).
Proper operation of the flame failure device should be checked at
startup and at least once a week thereafter. Refer to Chapter 8 for
information on flame safety checks. Check the program relay’s
annunciation for any system failure. Observe the promptness of
ignition of the pilot flame and the main flame.
Check for tight shut-off of all fuel valves. Despite precautions and
strainers, foreign material may lodge under a valve seat and prevent
tight closure. Promptly correct any conditions that cause leakage.
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