I have a 1989 Ocean Alexander with an Espar D7L heater that, miracle upon miracle, continues to work. Perhaps I should have followed the adage "If it ain't broke, don't fix it." Well, I didn't try to fix it --- I replaced it, with another D7L that had supposedly recently been rebuilt by an Espar dealer. At least it looks a whole lot cleaner than my old one.
Now the issue: How do I wire it to get what I want? What I have is the rectangular, 6-pin plug that plugs into the socket connected to the heater; the plug whose wires lead up to the heater control in the salon. Looking at the plug, the two top corners are square, & the two bottom corners have a 45 degree section, so that the plug can go into the socket only one way. The upper left pin has no connection; all of the 5 other pins are connected to the heater & are wired, with a 5-wire cable that goes to the heater control in the salon.
The rebuilt heater came with a new heater control that was labeled 302 1235. Looking at it from the top, it is stamped 12 V & has 7 pins. Six of the pins are located concentrically, with #1 located at 135 degrees (ie, SE), #2 located at 90 degrees (ie, E), continuing counter-clockwise & ending at #6 located at 270 degrees (ie, W); the 7th pin is at the center & is labelled #9.
The heater control, according to its description, has various steps that will increase the heat produced by the heater serially, up to its maximum heat. I don't care about that. With my old heater, I added a Honeywell thermostat & turned the old heater control On to its max. That's all I want it to do: Either to turn the heater on to its max when the thermostat turns on; otherwise, the heater is off. I realize that the heater can also be used as a blower without heat. I don't use it that way & want to wire the heater without the possibility of using it simply as a blower.
Question: How do I wire [the 5-pin plug at the heater] to [the heater control & the thermostat] so that the heater turns on to its max when the thermostat turns on; otherwise, the heater turns off?
BTW I went to Boat Electric this morning & discovered that they have moved, from their old building on Westlake up towards the Ballard Bridge at Nickerson Marina. They moved just a few weeks ago, & Jeff, their Espar guy, told me that it'll be a month or two until they get their service dept running again. Their office is loaded with boxes of parts, all of which need to be organized. Jeff referred me to Mark Walter, at Miller & Miller Marine, on Commodore.
Richard Wills
MV Komokwa
Elliott Bay Marina, Seattle