Assessments - 3, GPA: 4.3
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boilers which have electric water level controls, there are three probe extensions vertically oriented above the water with their lower ends positioned at various levels. Water is admitted to the boiler and is shut off in response to the water level sensed by the tips of the short and the medium length probe extensions. The electrical conductance of the water is used in this system for controlling its level. The third probe extension is a low water safety cutout sensor and operates on the same principle. . Operation Sequence — Water Level Control Assume an empty boiler. To fill, close Switch S for the following operations: 1) Solenoid SV2 is energized allowing the boiler to fill with water at the same time the primary circuit of Transformer T,is also energized. 2) The boiler will continue to fill until the water level reaches the Water Off probe extension completing the T, secondary circuit and energizing Relay Coil RC,. 3) When Relay Coil RC, is energized the normally closed contact opens, de-energizing Solenoid SV2 stopping the water fill. The normally open contact is closed, completing the circuit to the Water On probe. When the water boils away below the end of the Water On probe extension the following occurs: 1) The secondary circuit of Transformer T, is broken and the Relay Coil RCi is de-energized. 2) When Relay Coil RC, is de-energized the normally open contact opens, breaking the circuit to the Water Off probe extension. And. the normally closed contact closes, energizing Solenoid SV2 allowing the boiler to fill as in Step 2 above. Operation — Lew Water Safety Cutout When Switch S is dosed the following operations occur. 1) The primary circuit of Transformer T, is energized. 2) When the water level reaches the low water safety cutout probe extension and the momentary reset switch is manually dosed. Relay Coil RCj is energized. 3) When Relay Coil RC? is energized the normally open contacts close, completing the low water safety circuit through Contacts 7 and 8 and completing the circuit through Contacts 3 and 4. completing the 750 millivolt pilot generator circuit and allowing the gas control package valve to operate. If the water level drops below the Low Water Safety Cutout probe extension, the following occurs: 1) The secondary circuit of Transformer T3 is broken and the Relay Coil RC, is de-energized. Contacts 7 and GAS BOILER CONTROL CIRCUIT which shuts off the flow of gas to the burners. The burners will not operate until water level in the boiler is normal and the reset switch is operated. Optfattow-OoMrDialf» Condenser To activate the Boiler Drain Condenser System close switch S by placing toggle in the down position. To drain boiler, open boiler drain ball valve. The heat from the boiler drain water will close the normally open thermal switch TS and energize the condenser solenoid valve SV,. To de-activate the Boiler Drain Condenser System open switch S by moving toggle to center off position. 8 and 3 and 4 open, breaking the 750 millivolt circuit CLEVELAND RANGE CO., 1333 EAST 178th ST., CLEVELAND, OHIO 44110 Manufacturer rwenms tight of design impiwamaw or modification, as mnwaed. 0482 LITHO IN U-S.A. Data Shaat 260-M2 HOW THE ELECTRIC (WARRICK RELAY) WATER LEVEL CONTROLS OPERATE — ON ELECTRIC STEAM GENERATORS (WITH 3 PROBES) inside Cleveland Range Co. boilers which have electric water level controls, there are three probe extensions vertically oriented above the water with their lower ends positioned at various levels. Water is admitted to the boiler and is shut off in response to the water level sensed by the tips of the short and the medium length probe extensions. The electrical conductance of the water is used in this system for controlling its level. The third probe extension-isa-tow water safety cutoot sensor and operates on the same principle. wperanon sequence water imi conirei Assume an empty boiler. To fill, dose Switch S for the following operations: 1) Solenoid SV: is energized allowing the boiler to fill with water at the same time the primary circuit of Transformer T, is also energized. 2) The boiler will continue to fill until the water level reaches the Water Off probe extension completing the T, secondary circuit, and energizing Relay Coil RC,. 3) When Relay Coil RC, is energized the normally closed contact opens, de-energizing Solenoid SV* stopping the water fill. The normally open contact is dosed, completing the circuit to the Water On probe. When the water boils away below the end of the Water On probe extension the following occurs: 1) The secondary Circuit of Transformer T, is broken and the Relay Coil RC, is de-energized. 2) When Relay Coil RC, is de-energized the normally open contact opens, breaking the circuit to Me Water Off probe extension. And. the normally dosed contact doses, energizing Solenoid SV, allowing the boiler to fill as m Step 2 above. Operation — Low Water Safety Cutout When Switch S is dosed the follow...
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