Trane Voyager Question

[guardiantech]

My question is in regards to the Trane Voyager controls portion of the unit. If a CTI (conventional t-stat interface) circuit board is in place with the UCP circuit board can the CTI be unplugged from the UCP in order to resort back to the Trane DDC zone sensor module and remote sensor, etc. I have a system currently using a CTI with a 24VAC stat and would like to resort back to the Trane controls. Thanks for any help on this issue.

[Allen]

Hi Guardian,
Yes, you can remove the CTI card and connect the wire harness to the Voyager UCP. Then connect the Trane zone sensor that you want to use.
Good luck,
Allen

[freonrick]

just remember do not run the low voltage wires or check to make sure the low voltage wires is not in the same conduit or strapped to any other wires even 24v. if it is it will act up.

[service guy]

Stick with a conventional stat I can go to supply house and pick up any stat the customer wants, If you go back to trane stats then if a stat fails you go back to trane for a new one and then back again for a new one, Hey you do what you want or what the customer wants I'm just giving my honest opinion.

[willf650]

If you use the conventional thermostat you lose 90% of the logic that actually makes the unit function better than other units out there. The unit becomes stupid but is easier for alot of people to understand. Y1,Y2 and etc. is easier for people to comprehend. As Allen stated if you remove the parts and cycle the power it should reconfigure itself and go to town with the Trane sensor. Actually the same goes for any thing else in the unit as well. The board see's what hooked to it at power up to see what type of unit it is. Heatpump, gas fired ,cooling only and so on.

[service guy]

Originally posted by willf650
If you use the conventional thermostat you lose 90% of the logic that actually makes the unit function better than other units out there. The unit becomes stupid but is easier for alot of people to understand. Y1,Y2 and etc. is easier for people to comprehend. As Allen stated if you remove the parts and cycle the power it should reconfigure itself and go to town with the Trane sensor. Actually the same goes for any thing else in the unit as well. The board see's what hooked to it at power up to see what type of unit it is. Heatpump, gas fired ,cooling only and so on. Really elaborate on this 90% loss of logic?

[willf650]

The voyager units use a PID function to do their control and staging. They will take in account warm up and cool down rate as well as space temp difference from setpoint. They also take in account time away from setpoint in order to try and maintain setpoint. If its hooked to a thermostat all it now knows is on and off. The thermostat can be anything from a cheap mecury bulb to a fancy programable. For the most part they work off of setpoint and a deadband and thats about it.

[Allen]

Hi Guardian,
What Willf650 means in loss of logic is the Voyager UCP is not making the decision of when to heat or cool, the decision is being made by the thermostat.
If a Voyager zone sensor is used, the UCP decides when to start heating or cooling and when to terminate heating or cooling, depending on how rapidly the zone temperature is changing.
Also lost is system diagnostics, which can be read at terminals 6,7,8,9 and 10. They will tell you when the unit is down for cool fail, heat fail, fan fail and dirty filter.
The decision to change the thermostat is yours, one way or the other.
There is an excellent book available on the Voyager controls, that you should get, it will help you troubleshoot the Voyager.
Some of the other people in this forum have made it available for download as a PDF.
Good luck,
Allen