Question about Dayton (3E379) Heater

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Line voltage Tstat installation Dayton D-F79 elctric shop heater

Wiring in a 240 line voltage T-stat for this heater is confusing. I was under the impression that you could wire in the stat from the breaker first, prior to the heater unit. (breaker>stat>heater). It would act like a "light switch", right?
Well, there is a separate (from the power terminal block) Control Terminal Board within the heater that had a tag on it that read, "Attention. Thermostat MUST be wired to the control terminal board. This unit will not operate if thermostat is wired to the power terminal block. See wiring diagram..."
Following the diagrams in the owner's manual for the heater, and the Honeywell T-498B 4-wire line voltage T-stat, I wired the thing in as best I could figure from the contradicting info in the diagrams. (Haven't hooked to breaker yet).
I'm no electrician, but I can do basic house wiring, and the way they show to wire the thermostat to the control terminal block doesn't make sense to me.
It shows the L2-T2 (red wire side) of the t-stat connecting to a "W2" designated terminal on the control terminal block. This terminal dead ends. There is no wire inside the heater going from this "W2" connection. Doesn't this leave the circuit open?
The notes next to the wiring diagram talk about removing "jumper W1 to W2 when 2-stage thermostat is used." I dont see any "jumper" wire at this location. Should there be one here to complete the circuit or am I mistaken? The "W1" terminal is pre-wired in the heater, to the "contactor" in the heater unit.
I wish i could attach the diagrams.
Does this make sense to anyone?

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If I understand your post correctly....You state that you are hooking up a 240v heater and towards the end you speak of removing jumpers...W2 terminals..ect. It sounds to me your trying to us a 24v low voltage thermostat instead of a Line voltage thermostat.That's what I'd take a look at.

Posted on Jan 21, 2009

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First off, I couldn't quite put it all together based on what I was reading. I finally tracked down the Fahrenheat web site (www.fahrenheatpro.com). And called tech support (800) 452-4179.

To wire 2 BB units to 1 tstat.

1. Use #14 wire for 0-12 amps, #12 wire for 12.1 to 16 amps and #10 wire for 16.1 to 24 amps.

2. I have a 12/2 wire going from the tstat to BB#1 and another 12/2 wire going from BB1 to BB2.

3. Onthe left side of the heater, you will have 2 sets of black wires tied together with a nut (on right side it's 2 sets of Black/Red wires). You can use either side of the heater. For the purpose of explaining this, lets use the left side, 2 sets of black wires.

4. Undo one of the sets of black wires (it doesn't matter witch), the other set will be left alone.

5. Take the black wire coming from the tstat and tie it into one of the black wires from the heater and the black wire going to the second BB unit. So you will have those 3 wires tied together with a nut at the 1st BB unit.

6. Take the white wire coming from the tstat and tie it into the other black wire from the heater and the white wire going to the other BB heater. Again, you will have 3 wire tied together here.

7. At the second BB unit, tie the black wire coming from the 1st unit to one of the black wires in one of those 2 sets of black wires. Again, only undo 1 set of wires at the 2nd unit, leave the other one alone. Tie the white wire coming from the 1st unit to the other black wire.

8. Make sure ground wire in grounded at the tstat and at both BB units.

Hope this helps...... If I was less clear than I hoped, call tech support and they will walk you thru it....

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