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04 /26/ 24, 2:28pmLogin ] [ Contact Forum Admin ] [ Main index ] [ Post a new message ] [ Search | Check update time | Archives: 12345[6]78910 ]
Subject: Re: A new owner with a few questions


Author:
Bob Dilks
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Date Posted: 07/ 25/ 04, 1:11pm
In reply to: John Fitzsimmons 's message, "Re: A new owner with a few questions" on 07/ 14/ 04, 6:13pm

Blue Bird wired the AC current to the hot water heater through a large DC relay above the hot water heater. The DC relay is grounded to an insulated screw on the water heater or in the plumbing fittings screwed into the water heater. The screw extends through the insulation and makes contact with the water in the heater grounding the relay and and allowing AC current to flow to the heater. The purpose of the relay is to prevent calrod burn out if the tank is empty which would break the ground, opening the relay and cutting off current. Make sure the tank has water and then attach the grounding wire to the chassis to insure the relay is working. All water heaters have a high temperature cut off switch which cuts off the AC current when the water temperature rises above 180. Since the water heater has a motor aid that runs coolent through the tank at 195 degrees the high temperature switch may be off and needs to be reset. You may also have a burnt out calrod heating unit. Get out your multimeter to test for current flow for all of the above.

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