750-211 (revised 2009)
Promethean Boilers, Model 4WI Manual
8-9
8.6 — Flame Safety Control
Your spare control should be stored in a dry atmosphere and
wrapped in plastic. During an extended shutdown (e.g., sea-
sonal), the active control should be removed and stored. Mois-
ture can cause problems with control operation.
It is recommended that service be rotated between the active and a
spare control to assure a working replacement is available.
Be sure the connecting contacts on the control and its base are not
bend out of position.
FIGURE 8-10. Control Panel Open
The flame detector lens should be cleaned as often as operating conditions demand. Use a soft cloth moistened
with detergent to clean the lens.
A safety check procedure should be established to test the complete safeguard system at least once a month, or
more often. Tests should verify safety shutdown and a safety lockout upon failure to ignite the pilot, upon failure to
ignite the main flame, and upon loss of flame. Each of the conditions should be checked on a scheduled basis.
The following tests should be used to test the complete safeguard system. If the sequence of events is not as
described, then a problem may exist. Contact your local Cleaver-Brooks authorized representative for assistance.
8.6.1 — Checking Pilot Flame Failure
Close the gas pilot shutoff cock. Also shut off the main fuel supply. Turn the burner switch “on.”
The pilot ignition circuit will be energized at the end of the pre-purge period. There should be an ignition spark,
but no flame. The ignition spark can be viewed through the sight port in the rear door. Since there is no flame to be
detected, the program relay will signal the condition. The ignition circuit will de-energize and the control will lock
out on a safety shutdown. The flame failure light (and optional alarm) will be activated. The blower motor will run
through the post-purge and stop.
When replacing a control, be sure to lock out the main power supply switch since the control is “hot” even though the
burner switch is off. Failure to follow these instructions could result in serious injury or death.
!
Warning
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