Burnham K50 Boiler User Manual


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thermocoupleprovespilotameand,intheabsence
ofsuch,willcooland,within45to90seconds,will
causetheL62GB-3CPilotSafetySwitchtowhichitis
connected, to break the electrical circuit to the main gas
valvesaswellasshutofftheowofgastothepilot.
Thus,100%shut-offisachieved.
The5015Bthru5024Bboilersutilizetwo
Thermocouple Control Systems that are interconnected
electrically thru all operating and safety controls.
Should any of the aforementioned controls break the
power supply circuit, both Thermocouple Control
Systems would be de-energized. The proceeding
paragraph describes the function and operation of each
Thermocouple Control System. Should a pilot failure
on one Thermocouple Control System occur, the other
Thermocouple 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satised.
When operating control (A) calls for heat, it energizes main gas valves (B), starting burner operation.
Theburnerswilloperateuntiloperatingcontrol(A)issatised.Thehighlimitcontrol(C),willstopburner
operationincaseofexcessivesteampressure(steamboiler)orexcessiveboilerwatertemperature(waterboiler).
Low water cut-off (D) will stop burner operation if the water level in boiler drops below the lowest safe level.
The pilot safety switch (E), connected to main gas valve (B), prevents operation of the main burners in case the
pilotamebecomesextinguished.Pilotsafetyswitch(E)providefor100%shut-offofgassupply.
FIG. 55
WIRING DIAGRAM - 6 THRU 13 SECT. BOILERS
THERMOCOUPLE CONTROL SYSTEM
CANADA ONLY
a. LIGHTING INSTRUCTIONS
(1) Make sure that all main manual and pilot valves
havebeenoffforatleastve(5)minutes.
(2) Set operating and limit controls to desired
setting.
(3) Open pilot valve.
(4) Depress button on pilot safety switch to which
it is connected and hold lighted match on pilot.
Hold button in for at least one minute, or until
the pilot burner remains lit after the button is
released. Repeat for second pilot when boiler is
so equipped.
(5) Open manual main shut-off valve(s).
(6)Turnonmainelectricswitch.
NORMAL OPERATION SEQUENCE
5006Bthru5013B,seeFig.55
5015Bthru5024B,seeFig.56
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