Lochinvar Commercial Electric Water Heaters warranty Contactors, Control Circuit Transformer

Page 9

The limit is reset by pushing the red reset button on the limit. Operation of the limit control usually indicates a major problem with the heating elements or temperature control. Do not continue to push the reset multiple times. The problem causing the reset to function must be found and corrected to insure proper operation. The blanket of fiberglass insulation must be replaced over the surface thermostats and immersion heating elements before the power is turned on and the heater is returned to service.

CONTACTORS

FIG. 9 Magnetic Contactor

When the immersion thermostat and contactor option is provided, the power to the immersion electric heating elements is switched by a definite purpose magnetic contactor. The contactor is supplied with 120 VAC from the control circuit when the immersion thermostat senses a drop in stored water temperature below the desired set point. A magnetic coil in the contactor is energized to complete the electric circuit supplying power to the immersion heating elements. When the thermostat is satisfied, the contactor coil is de-energized and power to the heating elements is turned off.

CONTROL CIRCUIT TRANSFORMER

FIG. 10 Control Circuit Transformer

When the immersion thermostat and contactor option is provided, a transformer is used to reduce the line voltage to 120 VAC for internal control operation. The transformer is fused on the primary side. The VA rating of the control circuit transformer is based on the load of the various components in the water heater control circuit.

IMMERSION THERMOSTAT(S)

FIG. 11 Immersion Thermostat

9

Image 9
Contents Warranty Special Instructions To OwnerChecking Equipment Owner Warning ContentsInstallation Procedure Location of Unit CodesApprovals Table a Clearances from Combustible Construction Clearances from Combustible ConstructionMounting Water ConnectionsStorage Tank Inlet and Outlet ConnectionsRelief Valve Thermal Expansion WaterElectrical Connections Standard Equipment Jacket AssemblyComponents and Controls Terminal BlockSurface Thermostats With High Limit Fuses and Fuse BlocksContactors Control Circuit TransformerImmersion Thermostats Temperature Regulation Water Temperature SettingsApproximate Time / Temperature Relationships in Scalds High Water Temperature Limit Control Temperature AdjustmentImmersion Heating Elements START-UP ProcedureThermal Expansion Filling the Water HeaterInitial Start UP Checks Start UPMaintenance Shutdown ProcedureTemperature and Pressure Relief Valve Operation Water ChemistrySediment Removal Flushing the Storage TankIf YOU Cannot Identify Or Correct the Source Malfunction Trouble Shooting