Air Conditioning - Installed new thermostat but outside unit won't turn on

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slb5547
08-07-05, 02:20 AM
I have a duel zone system and put a new thermostat on the upstairs system. I checked all wires multiple times to make sure they are correctly attached. The thermostat is reading correctly but the outside unit has not turned on. I installed the same thermostat on the downstairs system couple months ago and had no problems.

mattison
08-07-05, 07:01 AM
Is the downstairs stat working?? Can you confirm voltage at the stat?
slb5547
08-07-05, 07:17 AM
No, when i restored power to the system the downstairs one never came back on. Let me check voltgage.

slb5547
08-07-05, 08:17 AM
I tried checking voltgage and didnt get any reading. But that's the first time doing it so I am not sure if i did it correctly.
mattison
08-07-05, 08:20 AM
The easiest way is to go to the airhandler and take a reading from the "R" to common and you should get around 24 volts.
slb5547
08-07-05, 07:38 PM
Looks like i blew my transformer when installing the new tstat. $200 for a new one. Thanks for your help.
mattison
08-08-05, 05:03 AM
$200 Dollars ???? Where are you buying this thing ??
slb5547
08-08-05, 08:27 PM
How much should one costs?
james curry
08-09-05, 05:00 AM
make sure you buy the right one 40va and 60va transformers are out there , they are usually around 50 to 60 dollars at the most
mattison
08-09-05, 05:06 AM
The most a person should pay for a 40 va transformer is $40 - $50 bucks at the most.