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Tech Tip #7 Electric boilers contain several 5 KW elements that are usually staged to turn on and off with timed sequencers. You must break each element individually with a separate relay with line voltage control in order to control the elements. To break the elements separately, you must have the control unit close enough to the boiler to make wiring with the line voltage economical, or you must use an Energy Sentry® Remote Relay Unit (see Tech Tip #10 for information).
Hook-up 1. Turn breaker(s) to the boiler OFF. 2. Mount Remote Relay Unit (if used) near the boiler to be controlled. Or, if the boiler is close enough to run conduit of flex between the main control unit and the boiler, make the connections directly at the control unit itself. 3. Interrupt the wires that feed each 5 KW element and wire them throught the relays. Use one element per relay if possible (four elements are typical). Use two elements per relay if necessary (five or six elements are typical). 4. Hook up the Remote Relay Unit to the control unit using the instructions provided. 5. With electric furnaces, the load control strategy should be programmed as "fixed priority," in the same order as the loads are controlled by the sequencer. Refer to Tech Tip #15 for information about load control strategy.
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