possible thermostat wiring - http://www.hvacmechanic.com/ Forums
Original message
| christoff
 |  "possible thermostat wiring"
, posted Sun 8 Jun 08:22:  
sorry, i have bought a 30 year old house that has air conditioning
when we moved in the wife wanted a an energy efficient t stat, so i put in a lux 1500. the furnace worked fine all winter, turned on and off at the correct temps.i turned on the air yesterday and all gets cold, but when the desired temp is reached the air will not switch off,even if you raise the temp unless turned to off.
theese are the units that i have; lennox air unit outside is very old but works, the inside unit is a lennox hs18-261-c8p. the furnace has a white rogers circuit board in it with the following connections
air unit has a black and white wires coming into the furnace
black goes to y1 and the white goes to c
now the loom that goes to the thermostat has 4 wires , from the furnace board black goes to y1, green goes to green, red goes to r, and white goes to w1
i have hooked up theese wires to the t stat as follows,
g to green, r to rh, w to w black to o.
i have tried different combonations , but i can;t seem to control the switching off of the air by moving the temp setting, can someone please tell me what i am doing wrong, thanks chris.
[this message was edited by christoff on Sun 8 Jun 08:40] |
| Replies:
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| theduke03
| "Re(1):possible thermostat wiring" , posted Sun 8 Jun 08:54
Switch the black wire on stat from O to Y or Y1.
"My dad was the most feared furnace fighter in Northern Indiana."
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| | christoff
| "Re(2):possible thermostat wiring" , posted Sun 8 Jun 09:11
hi, i just changed the wires, and the air won't turn on at all?
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| | theduke03
| "Re(3):possible thermostat wiring" , posted Sun 8 Jun 10:04
Do you have a jumper between Rh and Rc? If not then add one. Did you shut off furnace before changing the wiring? If not you may have blown a fuse(in furnace) or a transformer.
"My dad was the most feared furnace fighter in Northern Indiana."
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| | christoff
| "Re(4):possible thermostat wiring" , posted Sun 8 Jun 10:17
yes there is a jumper, i did not shut down the furnace, i will check that the fuse isn't blown (there is a breaker for the transformer in the furnace)
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| | theduke03
| "Re(5):possible thermostat wiring" , posted Sun 8 Jun 10:25:
There may be a breaker for the transformer but probably not. Sorry, I'm not very familiar with your furnace. Hopefully there will be a purple or orange fuse like this on the circuitboard:
Your stat may have a 5 minute time delay. Did you wait more than 5 minutes for ac to come on? Will the blower come on if you put fan switch to on?
"My dad was the most feared furnace fighter in Northern Indiana."
[this message was edited by theduke03 on Sun 8 Jun 10:27] |
| | christoff
| "Re(6):possible thermostat wiring" , posted Sun 8 Jun 10:40
the breaker was ok, the fan would not work or the ac would not come on, so i switched the black wire to the o on the t stat and the fan works and the ac came on, but still cannot be switched off by raising the temp.im wondering if the people have the wires on wrong on the furnace?
here is a link to the furnace wiring
http://pirl.lennox.com/PDFs/0124f.pdf
i appreciate your help duke!!
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| | theduke03
| "Re(7):possible thermostat wiring" , posted Sun 8 Jun 10:47
No. the wiring was correct after you put the black on Y. Do this: Put that wire back on Y and add a jumper from Rh or Rc to Y. If ac turns on then your new stat is bad. Lux Sux.
"My dad was the most feared furnace fighter in Northern Indiana."
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| | christoff
| "Re(8):possible thermostat wiring" , posted Sun 8 Jun 10:59
it came on when i jumped it, but i also thought that it was the thermostat, so yesterday i returned the lux and got a brand new one in exchange, hooked it up as you say and it still did not operate, it did the same thing until i hooked the wire up to the o terminal also i have a honeywell and hooked it up and it does the same thing? thats why im wondering if someone hooked up the wires from the ac unit to the furnace wrong
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| | theduke03
| "Re(9):possible thermostat wiring" , posted Sun 8 Jun 11:21:
OK. It is highly unlikely that you got 2 bad stats but I wouldn't put it past Lux. With black wire on Y the wiring is correct which means the problem is most likely the operator. Did you wait 5 minutes? Is stat calling for ac? There should be Putting the jumper from r to y verifies that wiring is correct. Forget about O. That terminal is not for your system. Is the jumper well connected to RC? If there is wire insulation in the terminal it could prevent the jumper from making contact to the terminal.
"My dad was the most feared furnace fighter in Northern Indiana."
[this message was edited by theduke03 on Sun 8 Jun 11:30] |
| | christoff
| "Re(10):possible thermostat wiring" , posted Sun 8 Jun 11:28
ok, i put the wire back and will wait for a while, and see what happens.
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| | christoff
| "Re(2):Re(10):possible thermostat wiring" , posted Sun 8 Jun 12:08
well duke, i did what you said, i set the stat for 24 celcius and started to sand something, 5 mins went by, 10 mins, and truthfully i forgot about it, then after 13 mins. the compressor came on, so i just have to wait to see if it turns off.
ill repost when it turns off i think it has to go down 1 degree lower to shut down. chris.
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| | christoff
|  "Re(3):Re(10):possible thermostat wiring"
, posted Sun 8 Jun 12:32
wow!!!!!!!!! it works, thanks alot duke if your ever up in to. i owe you a beer chris.
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| | theduke03
| "Re(4):Re(10):possible thermostat wiring" , posted Sun 8 Jun 12:56
If you don't mind I'd rather have a joint! Preferably some of that B.C. stuff.
"My dad was the most feared furnace fighter in Northern Indiana."
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| | christoff
| "Re(5):Re(10):possible thermostat wiring" , posted Sun 8 Jun 13:36
lol!!!
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