Burnham K50 Boiler User Manual


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When the operating control (A) calls for heat, it energizes the main gas valves (B) in both gas trains
startingburneroperation.Theburnerswilloperateuntiltheoperatingcontrol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).
The low water cut-off (D) will stop burner operation if the water level in the boiler drops below the low-
est safe level.
Shouldoneofthepilotamesbecomeextinguishedthepilotsafetyswitch(E)towhichitisconnected
wouldshutoffthegassupplytothatpilotandtothemaingasvalvesandburnersitisserving(100%
shut-off). Operation of the burners supplied by the second gas train will be unaffected.
FIG. 56
WIRING DIAGRAM - 15 THRU 24 SECT. BOILERS
THERMOCOUPLE CONTROL SYSTEM
CANADA ONLY
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