Without seeing the wiring diagram, I can only say that the MV/PV terminal in many cases is used as the common from the thermostat/transformer. Usually, the 24 volts is supplied to the thermostat from a step down transformer and the thermostat sends voltage to the controller. I would hesitate to "guess" at this without a complete understanding of the wiring requirements. Any HVAC tech should be able to help you.
SOURCE: Line voltage Tstat installation Dayton D-F79 elctric shop heater
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.
SOURCE: I am hooking up a Honeywell RTH111 Thermostat, it
http://customer.honeywell.com/techlit/pdf/PackedLit/69-2060EFS.pdf
Hi I have a manual regarding the thermostat, however that's about the only info i could glean from the 'net.
However from the data in the manual, I am pretty sure you should be able to work it out, most often, wiring goes color to color.
Some wires are NOT used, usually there are only Three, Phase Neutral, & Earth.
SOURCE: iam working on a reznor
Have you checked to make sure that the new module is passing voltage to the MV terminal on the gas valve? I have seen the solder joint loosen on these things and intermittedly pass voltage. Could also be the relay in the module. Your meter will tell you which it is.
SOURCE: wiring for Honeywell H46C1166 - Dehumidistat, 24/120/240 Vac Wall-Mounted
Suggest you people READ the question before giving BS answers !!!!!!!!!!
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