Starting and Operating Instructions
5-14
750-211 (revised 2009)
Promethean Boilers, Model 4WI Manual
Set the manual-automatic switch to “Manual” and turn the manual flame control to “Close.”
Turn the burner switch to “On.” The load demand light should glow. The low-water level light should remain out,
indicating a safe water level in the boiler. The programmer is now sequencing. See Chapter 4 for sequence details.
On ignition failure, the flame failure light will glow and the blower will purge the boiler of unburned fuel vapors
before stopping. After ignition failure, wait a few moments before resetting the lockout switch.
After main flame ignition, the burner should be set on manual control at its low-fire setting (with manual flame
control at “close”) until the boiler is properly warmed. Close the steam header.
In the case of a steam boiler, close the vent valve when the steam begins to appear.
A hot water boiler must have a continuous flow of system water through the vessel during the warm-up period.
The entire water content of the system and boiler must be warmed prior to increasing fuel input.
If the flame at low-fire provides insufficient heat to reach normal operating pressure or temperature after 30 min-
utes, gradually increase the firing rate by turning the manual flame control in one point increments to no higher
than the third cam screw. Operate at the increased fuel input rate for a period of time until an increase is noted in
pressure or temperature.
After the boiler is thoroughly warmed, turn the manual flame control to high fire. At this point a combustion anal-
ysis should be made, with instruments, and fuel flow regulated as required. Refer to the adjustment procedures in
Chapter 6. After making the high-fire adjustment, manually decrease the firing rate, stopping at each cam screw to
analyze combustion gases, and adjust as required.
To properly perform the testing and adjusting, it is necessary that the burner be allowed to fire at a maximum rate
long enough to achieve desired results.
Do not relight the pilot or attempt to start the main burner, either oil or gas, if the combustion chamber is hot and/or
if gas or oil vapor combustion gases are present in the furnace or flue passages. Failure to follow these instructions
could result in serious injury or death.
NOTE:
On an initial starting attempt, several efforts might be required to accomplish “bleeding” of fuel lines, main or
pilot. If ignition does not hen occur, do not repeat unsuccessful attempts without rechecking the burner and pilot
adjustment.
The burner and control system is designed to provide a “pre-purge” period of fan operation prior to establishing igni-
tion spark and pilot flame. Do not attempt to alter the system or take any action that might circumvent the “pre-purge”
feature. Failure to follow these instructions could result in serious injury or death.
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Warning
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Warning
Summary of Contents for 4WI
Page 46: ...Burner Operation and Control 2 22 750 211 revised 2009 Promethean Boilers Model 4WI Manual...
Page 62: ...Waterside Care and Requirements 3 16 750 211 revised 2009 Promethean Boilers Model 4WI Manual...
Page 70: ...Sequence of Operation 4 8 750 211 revised 2009 Promethean Boilers Model 4WI Manual...
Page 114: ...Adjustment Procedures 6 28 750 211 revised 2009 Promethean Boilers Model 4WI Manual...
