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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Re: wiring a thermostat
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")
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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.
If you have only two wires and two terminals, it doesn't matter which one is which.
The thermostat is a switch. Your black and red wires would be the input and output to that switch. One is always hot, the other is hot only when the thermostat is calling for cooling, that is, when the switch is closed.
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:
Do you have a circulator that circulates when the water is up? Many controls have a AUX connection ... wire the AUX to your fan --- alaternatively, wire directly fron your circulator connection to the fan.
Best solution GET RID IT BEFORE IT'S TOO LATE....Original 9420 installed 8-18-06 changed temperature by itself and would not allow any adjustments...this one replaced on 1-3-08 and this one is doing same thing. Heat set on 70 when I noticed it getting extremely hot I checked thermostat and it was on 99 and would not allow me to adjust. Switched to off position waited 25 minutes and cut back on to heat....still will not allow me to adjust down from 99.....THIS PIECE OF **** WILL BE REPLACED TOMORROW WITH ANOTHER TYPE OF THERMOSTAT.
what kind of light switch are you replacing??? assuming house light switch???
one way or two way switch??
I have not come across the type of switch before.
L1, L2 is just label as line 1 and line 2, comm is usually refer to common (ground wire-white).
is the red wire-hot???