Original message
| toomyw
 |  "T8624D Honeywell Problem"
, posted Mon 18 Jul 18:01  
I'm working at a non-profit in New York City.
Recently I purchased three Honeywell T8624D's to replace our Honeywell T874D's. Then we'll have programmed on and off times and I won't have to go into each mechanical rooms to tend to the units.
The wiring looks very straightforward and I tried to install two of them today. However, after installing them and throwing the breaker, the new thermostat display didn't show anything at all- no LCD.
I reinstalled the old thermostat and the system started right up without a problem.
Our system is a 2 cycle cooling and 1 cycle heating.
Wiring on old and new
W1--W1
G--G
Rc--Rc
Rh--R
Y1--Y1
Y2--Y2
Rc and Rh are bridged on the old thermostat, so I bridged them on the new thermostat.
Then I tried it once without the bridging. Nothing happened still.
Any opinions, questions, help you can offer would be very appreciated.
Tom
|
|
Replies:
|
| Xenos
Webmaster 
| "Re(1):T8624D Honeywell Problem" , posted Mon 18 Jul 21:47
I belive that thermostat requires a common... Does it have a C terminal?
Xenos.
The best way to escape a problem is to solve it.
|
| | toomyw
| "Re(2):T8624D Honeywell Problem" , posted Tue 19 Jul 09:11
Thank you for replying to this problem. I appreciate it.
Yes, the thermostat does have a "C" terminal.
Do you have any advice on how I should get a 24v common to the thermostat?
Thank you.
|
| | Xenos
Webmaster
| "Re(3):T8624D Honeywell Problem" , posted Tue 19 Jul 19:50
You need to run a wire from the furnace to the thermostat.
Xenos.
The best way to escape a problem is to solve it.
|
|
|
