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(8) When the operating control is satised,
terminals #6 in the panel and relay are de-
energized. Terminal #5, “Main Gas Valve”
lamp, Main Gas Valves, and Pilot Line Solenoid
Valve are all de-energized and main burner and
pilot burner ames are extinguished.
(9) “Main Power” lamp remains lighted.
c. SAFETY SHUTDOWN
(1) SAFETY SWITCH CIRCUIT
If limit control, Low Water Cut-Off or any other
electrical safety switch opens, power to terminal
#6 in Panel is interrupted thus de-energizing
terminal #5 in Panel. Consequently Main Gas
Valves are de-energized and main burners are
immediately extinguished. Normal operation
can be resumed when the cause of safety switch
malfunction is corrected. Make sure all manual
resets are activated where involved.
(2) PILOT FAILURE:
(a) Pilot failure can only occur during the
operating cycle of the boiler. Any pilot
failure on the Q179C Electronic Pilot, after
ignition of pilot ame, will close the main
gas valves in 0.8 second.
(b) For 15 seconds, after failure of the Q179
pilot, the relay through terminals #3 and
#4 will try to re-establish pilot ame. If
no pilot ame can be sensed by the ame
rod circuit, terminals #3 and #4 are de-
energized, the relay will lock out of
safety. “Pilot Failure Alarm Lamp” will be
activated.
(c) Pilot failure is caused by the following:
(1) Complete loss of gas supply.
(2) Poor ignition spark caused by low
voltage, poor ground connection, faulty
wiring, and possibly a defective ignition
transformer.
(3) Low gas pressure will prevent ame rod
circuit from sensing pilot ame properly.
(4) Unusually strong secondary air drafts
can blow the pilot ame away from the
rod momentarily causing nuisance shut-
down.
(5) A pilot line solenoid valve will not open
because of faulty wiring, low voltage, or
possibly the valve is defective.
(6) A defective RA890 may be the cause
but items (1) thru (5) should be followed
rst. See also RA890 relay literature
furnished with the panel system.
(7) By referring to the Sequence of
Operations, step by step operation of
the system can be controlled with
diligent use of the switches in the
Panel(s). In this manner the cause of
pilot failure can be readily found. After
12. EEP CONTROL SYSTEM – 5015B thru 5026B
The 5015B thru 5026B boilers utilize two EEP Control
Systems that are interconnected electrically thru all
operating and safety controls. Should any of the
aforementioned controls break the power supply circuit,
both EEP Control Systems would be de-energized.
The succeeding paragraphs describe the function and
operation of each EEP Control System. Should a pilot
failure on one EE Control System occur, the other
EEP Control System would not be affected. Thus
main burners on the unaffected side would ignite on a
“call for heat” and would continue to operate until the
operating control was satised.
The EEP Control System functionally is the same as
the EE Control System. The RA890F Protectorelay
however, is installed in a prewired control cabinet along
with a terminal strip, “main power” switch, “main gas
valves” switch, “main power” lamp, “main gas valves”
lamp, and “pilot failure” lamp.
The EEP Control System utilizes an RA890F
Protectorelay and a Q179C Rectication Pilot, which
in addition to a pilot burner and rectifying ame rod
ame detector to prove pilot, includes an ignition
electrode for spark ignition of the pilot. A Webster
612-6A7 Transformer supplies the high voltage spark
potential. Once pilot ame is proven, ignition stops but
pilot ame continues as long as there is a “call for heat”
(intermittent electrically ignited pilot).
The RA890F Protectorelay Primary Control is a non-
programming amplifying relay which when used with
the Q179C Pilot provides solid state electronic Flame
Safeguard Protection that will not allow the main
gas valves to open on “call for heat” or that will shut
down main burners and turn off “Main Gas Valves”
lamp within 0.8 second if pilot ame is not “proved”.
Protectorelay will lockout on safety shutdown within
15 seconds if there is a pilot ame failure on start or, if
during the “run” cycle, pilot ame is not re-established,
“Pilot Failure Alarm Lamp” will come on. Since #3
terminal in the Protectorelay is de-energized at end of
safety switch timing, a solenoid valve in the pilot line
will close and thus 100% shut-off is achieved.
a. OPERATING INSTRUCTIONS
(1) Turn off all switches on both panels.
(2) Turn off all manual main and pilot gas valves.
Wait at least ve (5) minutes before proceeding.
(3) Push safety reset button on both panels.
(4) Set Operating Control to desired temperature or
pressure.
the cause of pilot failure has been
corrected, resume normal operation by
following the Lighting Instructions on
the Panel.
d.
SHUTDOWN INSTRUCTIONS
(1) Turn off switches on panel.
(2) Close manual shut-off valve and pilot valve.