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Wiring a thermostat

What do ''comm'', ''satisfied'' and ''demand'' relate to on the wirin diagram. i am not using it in a conventional heating setup but a plant growroonm to maintan constant temp control of stand alone heater.
i know one must relate to live ,earth etc but which ones?

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  • b_dawood Dec 14, 2008

    1st of all many thanx 4 your reply

    i didnt mention i was in uk. i wired the live from the mains to the "demand" terminal no 2.

    i wired the live from the heater to the "common"terminal.

    I joined both earths (grounds) ( 1 from main , 1 from heater)together.

    again both neutrals were joined this time in jinction box; and another feed from this went to terminal "neutral"

    so far so good but am not an electrician and would luv any comments

  • Robert Cannon
    Robert Cannon May 11, 2010


    Can you provide more information on the thermostat? A thermostat is a simple computer that doesn't necessarily follow live, neutral, and ground.


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Comm should be the common terminal/wire
Satisfied means that the unit is no longer calling for heat because the thermostats setting has been "satisfied" and has shut the unit off until the room is cooler and it is then "damanding" operation. This should bring the unit on. (when the thermostat is in "demand")

Posted on Dec 20, 2008

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I know how to set the thermostat but the heaters dont seem to come on unless set to a high heat !!

If you have 2 thermostats it is called a 2 zone system. I can help you but it may take a few messages back and forth.
  1. Go to one the thermostats and read the actual temperature the thermostat is showing in the room.
  2. Turn the the heat on by increasing the temperature you are requesting on the Thermostat (use the dial or buttons depending on the type) & write this temperature down
  3. Write down the temperature in the room when the unit stops.
Reply to this message with the (3) Temperatures i/e T1=__, T2=__, T3=__. I will get back to you w/ the next step.

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The double snowflake means that the second stage cooling is on. (One snowflake indicates first stage cooling.) This gives a greater temperature change in extremely hot conditions with than you could get with a single cooling medium and drier air in your home.
From the patent: A two stage cooling system in which the first stage's cooling affect is transferred to the second stage through direct contact with an oil-like material. The oil-like material is cooled by direct contact with water which has been evaporatively cooled. The oil-like material is then utilized to cool the air stream prior to the second stage evaporative cooling. The use of an oil-like material in the first cooling stage of evaporative cooling allows a relatively dry air stream to be produced so as to fully capitalize upon the evaporative cooling affect of the second stage cooler.

The second stage comes on if your system hasn't reached the desired temperature at the thermostat within a programmed length of time (5 minutes is a usual setting). BTW: Your system also has two stage heating.

I hope this helps.

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My Robertshaw 9600 displays 99 degrees and because it is satisfied, is not calling for heat. The temp is actually in the lo 60's and falling. I've tried battery replacement, but nothing changed. Other...

Hmm. I don't think it posted the first time around. So I'll try again.

There is a temperature sensing diode on the back side of this thermostat's circuit board. This diode may have failed or become disconnected.

I'd lean towards its having become disconnected, as I've been inside an example of this Robertshaw (originally Maple/Chase) 9600 thermostat and noticed that the soldering on this part was of poor quality. So if you have a soldering iron, and know how to use it, you could probably fix it.

I have a web page (just the facts, no ads, malware or fluff) that talks of some other common problems with this thermostat and how to fix them:

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