Hot water heater power relay

[Joe Garner]

Hi Mike,

What Ralph says is what I have on my '87.  When I replaced the heater I remember drawing out a schematic of the circuit board, but cant find it now.

I attached a print from  BB that details the wiring...


HTH, Joe
'87 PT40
Sedona, AZ

On Mon, Aug 1, 2011 at 9:27 PM, mbulriss <"mbulriss@yahoo.com"> wrote:

 

A friend with a 1986 PT40 called with a weird power problem to his hot water heater. He says the 110V power is routed through a relay in the 110 power line before the normal on/off switch. It appears the relay is one of those 12V switched relays which controls the 110 power. He has not been able to trace it to see where the 12V leads go to. The relay appears to be stuck open now and he gets no power to the hot water heater. If he by-passes the relay, and turns the on/off switch on, he gets power and hot water.



I do not remember having that set up on my 83, nor on my 91. Does anyone have a power setup like that for their hot water heater power? What is controlling the 12V power source? An over temperature switch/sensor somewhere? Or is this some prior owner's undocumented "upgrade"? He is concerned about just bypassing the relay without knowing what it is for.



Thanks for any ideas.



Mike Bulriss

1991 WB40 "Texas Minivan" (with hot water)

San Antonio, TX (balmy triple digits are us)