SON OF A BITCH.... Hooked it up to the 'RC' terminal and it frickin' works!!!
now that my hair has turned totally white with frustration, I can get to brewing tomorrow!!!!
doing my ice test to see if the fan starts in 'Auto'
SON OF A BITCH.... Hooked it up to the 'RC' terminal and it frickin' works!!!
now that my hair has turned totally white with frustration, I can get to brewing tomorrow!!!!
doing my ice test to see if the fan starts in 'Auto'
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'RH' & 'RC' should be commoned. 'G' is for fan control in a heating/cooling system. 'W' is for heating control. 'Y' is for cooling control. Figure 4 on the bottom should give you the layout.
PJ
Roger,
First, your wiring as posted on the RCB is off on one point: The hot or positive from your transformer should go to the RC on the t-stat. RH is for heating, and if there is no jumper from RH to RC, your existing setup will not work.
Beyond that, it still MIGHT not work. What is the ampacity of your 12 vdc transformer, and what is the amp draw of the fans? It may well be that the current requirement of the fans is larger than the transformer can supply.
If you have to replace components, get 24v AC muffin fans, they are quite common. Then use a 40 va or larger 24 vac transformer, this will also conform with your digital t-stat. If you use the digital stat you will also need to wire the common (C) terminal of the stat to the common side of the transformer.
The transformer secondary terminals: Connect one red wire and one black wire. Test by connecting the two fan wires to the two transformer leads. Fan should run. Then hook it up with the stat. Connect the red transformer wire to the RC on the stat, black to the C (common) on the stat and one of the fan leads. Connect the other fan lead to the G on the stat. Switch the "FAN" switch on the stat from "auto" to "on." Fan should run. Switch back to "auto" and fan should go off. Set t-stat to temp below room temp, fan should go on. If it does not, you need to put a jumper wire from the Y to the G terminals, as a few stats only energize the G with the fan switch. The Y terminal is for cooling, and ONLY energizes whent the setpoint is lower than the ambient temp.
You may also want to make sure that your thermostat is 12V rated, some are actually 24V - been there done that. If it is 24V, you can use a relay to open and close the fan circuit to control it - I used mine to open and close the fan circuit as well as a pump to circulate fluid for a wort chiller.
Hoppy Trails,
Marc
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