I am working on trane rtu that wont come on because of a communication error with the unit and sensor on this tracker system, which I really know not a lot about. I can jump out the unit with that test 1, test 2 terminal strip but it only runs for 1 hour which I understand is the way it is designed. My question is this, is there a way to jump out this type of trane rtu(YCD300BWHADD) for longer than 1 hour so I can keep the customer off my back until I attempt to figure out why I have a communication error at the tracker board.
Jumping out trane rtu
iceage
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I am working on trane rtu that wont come on because of a communication error with the unit and sensor on this tracker system, which I really know not a lot about. I can jump out the unit with that test 1, test 2 terminal strip but it only runs for 1 hour which I understand is the way it is designed. My question is this, is there a way to jump out this type of trane rtu(YCD300BWHADD) for longer than 1 hour so I can keep the customer off my back until I attempt to figure out why I have a communication error at the tracker board.
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yes there is
In order for a Voyager Micro (Constant Volume) unit to operate, it must know the temperature of the zone being conditioned. With this input only, the unit will operate in a default mode. The indoor blower assembly will run constantly, the cooling set point will be 74F and the heating set point will be 71F. The unit will automatically heat or cool to maintain the temperature within the default range.
Disconnect the comm lines and this will make it run.
In order for a Voyager Micro (Constant Volume) unit to operate, it must know the temperature of the zone being conditioned. With this input only, the unit will operate in a default mode. The indoor blower assembly will run constantly, the cooling set point will be 74F and the heating set point will be 71F. The unit will automatically heat or cool to maintain the temperature within the default range.
Disconnect the comm lines and this will make it run.
Does any one know which com lines to disconnect, tried at the unit and jumped out t1 and t2 still ran for an hour and shut off, Not at all familiar with trane voyager units with zone control. always work with systems where I simply jump out r and y.
I'll be honest i dont know whats meant by "tracker" system but I do know that you can take the MAT thermistor (the sensing bulb right by the blower in the return side, take of all the leads at the low voltage landing strip except 1 and 2, disconnect the BAYSENS (room sensor) and hook leads 1 and 2 inside to the MAT sensor, which then becomes your t-stat and the unit wil maintain 72* (72* I think) Really any of the thermistors on the unit will work but thats brobably the easiest to get at. Hope that helps.
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Not to seem trivial, but when you say "tracker," is it possible that you mean "tracer," as in "tracer summit?"
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Connect terminals 1 & 2 on the LTB (not the 2 test terminals) to a 70* 10k thermistor mounted in the return air. You can temporarily use the outdoor air sensor from the corner of the unit near the LTB. just cut it out and nut the wires separate.
Thanks boatracer, what happened here was that another apprentice jumped out a vav apparently and all communication was lost with the tracker system. I traced back the daisy chain wiring back to a dedicated transformer and replace an open fuse. At each VAV five in total, the dip switches were played with and not one would open because the addresses were wrong. After replacing fuse, resetting addresses, unit ran. Appreciate all the help, never did have to jump out unit. Someone else told me I could purchase a resistor at say 10K ohms and put it across Test 1 and 2, disconnect com lines from communitcation board at rtu and this value would simulate a call for cooling and unit would run, dont know if this accurate because i never tried it, anyone here of this solution?
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502 Posts
Not test1 & test2 ... Regular 1 & 2
1 & 2 are the zone sensor terminals
1 & 2 are the zone sensor terminals
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304 Posts
Naw, It's more of an overgrown tcon or pro 8000.
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