
CONTROL SYSTEMS (STEAM AND MOTOR)
124
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\ IB 17 glVi
/ Oil
Heater
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1 High Oil Temp. Cut-out Switch 11 Fuel Supply
2 Low Oil Temp. Cut-out Switch 12 Fuel to Burner
3
Ou
Heater Switch 13 Fuel to Recirculating Line
Flame Failure Cut-out Switch 14 Steam Pressure Switch
4 (hand reset) 15 Oil Pump
5 Photo Cell (Ignition Spark) Low Water Level Cut-out
6 Ignition Circuit Switch 16 (hand reset)
7 Hame Failure Circuit Switch 17 F.D. Fan
8 Flame Failure Photo-cell Combustion Air Failure Cut-out
9 Time Delay (Air Purge) 18 Switch
10 Timer (Ignition Spark) 19 Time Delay
Fig. 123 Auxiliary Boiler Control System
Fig. 123 shows a combustio ...