Starting and Operating Instructions
5-16
750-211 (revised 2009)
Promethean Boilers, Model 4WI Manual
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 shutoff point. If the load is light, the header valve can be closed or throttled until the
pressure increases. Observe the steam gauge to check the cutoff 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 cutout 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).
5. 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 sys-
tem failure. Observe the promptness of ignition of the pilot flame and the main flame.
Refer to the adjustment procedures and maintenance instructions given in Chapters 6 and 8.
It is advisable to check for tight shutoff of fuel valves. Despite precautions and strainers, foreign material in either new
or renovated fuel lines may lodge under a valve seat and prevent tight closure. The situation is especially true in new
installations. Promptly correct any conditions causing leakage. Failure to follow these instructions could result in seri-
ous injury or death.
!
Warning
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