View Full Version : Trane Comm4 Digital Input
05-08-2011, 06:53 PM
I am looking for a solution to monitor dry contacts at a Tracer Summit Comm4 IPAK on a BMTW BCU. The inputs will be used to control the compressors for load sheding. In the past we have used MP503's as well as Functional Devices LON relays when there was Comm5 at the IPAKs. Are there any Comm4 devices still available? Maybe some unused inputs at the TCI? I really do not want to have to add a LON card and pull wire for this.
Any ideas would help.
Thanks in advance.
05-10-2011, 05:50 AM
I believe the intelipac heat module has an auxilary temperature input. You can wire a couple resistors in your circuit and if the temp reads x the circuit is closed. If the temp reads Y its open.
05-10-2011, 10:53 AM
Thanks for the reply willf. I really need (3) seperate control points, 1 for each refrigeration circuit and 1 for heating. This is really not that hard except for the notifications that are generated. Heating will disable with a comm failure from the Heat Module and reset automatically after it is restored and forcing a condenser temp sensor out of range will cause a compressor lock out and reset automatically when restored but they generate a diagnostic. Now if there was a way to clear that diagnostic from Summit with CPL that would work. Is there a way to clear the diagnostics with CPL?
05-10-2011, 06:23 PM
Well I've done 4 different states using a temperaure input, to do 3 seperate inputs it would be 9 different states. It's doable as far as inputs but your question has now changed. I would'nt go about shuting off stuff the way you are intending. I would do it through the system and not but shunting sensors and equipment interal comunication.
05-10-2011, 08:57 PM
will, I hear what your saying about controlling it with the system and as it turns out it does not have heat, so probably no 1U50 Heat Mod ( I have not been to the site yet ). Even the demand limit is only either 50 or 100% demand limit and as far as I know can not be referenced to another object. I need to be able to disable circuit 1 and circuit 2 seperately and even with a spare input I do not see a way of controlling it through the system other than using a comp-disable that allready exists. I would not be disabling a saftey device but rather selectively triggering it and allow the system to maintain minimum on and minimum off times. Really no different than changing the low ambient lockout setpoint to shut the compressors off. I understand the in line resistors to to get the different states but unless I am wrong ( and I hope I am ) I still can not control the compressor circuits seperately.
I would love to hear some of the Trane guys chime in on this because I would think there is a way to do this a little cleaner.
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