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Master tech
Master tech, Mechanical Engineer
Category: HVAC
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Experience:  35 years hvac/r master, awarded inventor
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I need the wiring diagram for a Robertshaw grayson 70008DE-S7B,

Resolved Question:

I need the wiring diagram for a Robertshaw grayson 70008DE-S7B, 3E0-500-872 Reg No Reg 24VAC 0.55 Total Amp Gas Control valve. I have a Radiant Heater and need to know what terminal on the top get the Ground and what gets the 24 V from the control mondule. There are 3 terminals on top of the unit. Any help would be greatly appreciated
Submitted: 6 years ago.
Category: HVAC
Expert:  Master tech replied 6 years ago.
Hello, are the screws colored and what colors?
Customer: replied 6 years ago.

There are no screws on top of the unit - just three blade connectors. From a top view you have one blade at 10:00 position and two blades (one at 3 o'clock and one at 9'oclock). I am cetrain that the one at 3 9'clock is Ground. I am 80% sure that the one at 9 o'clock is 24 VAC from the controller - but not positive. On the back there is a valve that I have not removed the wiring as of yet

Expert:  Master tech replied 6 years ago.
if you have an ohm meter check each spade with one probe of the meter and the other touch to any metal body and if you get a reading you have found the ground connection. The other two terminals be be your 24v is and one is nuetral from the transformer
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