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Why replace the BCU? it seems the easiest approach would be to use the JACE to talk to the rest of the Trane gear (then you don't have to worry about Comm3, Comm4 etc etc) via the BCU (using BACnet)...

I agree with Codewriter that it ain't always so that the power saved on compressors is more then the increased fan power! In typical commercial building in Oz (Central AHU's and Chiller Plant, VAVs...

Thanks once again for the responses. I agree that the environment and its effect on the wiring connections and control circuitry are really the issue and certainly in my opinion space sensors are not...

There I was feeling inadequate at being a plain old "Regular" member, move over I want a Super Pro category now.

I will get a proposal from JCI and presumably they willl offer an NAE solution. Thats fine but I am looking at options and the JACE is one of them. By the way you should understand that down here we...

Has anyone had experience connecting a JCI DX-9100 Ver 1 controller to a JACE using the N2 bus. I am considering using the JACE to get visibility of an installation of 2 off DX9100 (standalone, no...

Thanks for the feedback gents which pretty much confirms my thinking on this subject. After working in controls contracting for almost 20 years and now working for a property owner on the other side...

Does anyone have any thoughts on the service life of 10K thermistors. I was advised recently that the thermistors (space temperature sensors) should be replaced every 5 years....

I am dubious...

The DP sensor in a VAV controller is measuring the velocity pressure with repect to the static pressure. Hence the sampling tube has holes directly in the path of the airflow and at 90 degrees to...

Ninax I feel that you give LON far to much credit in terms of changing market forces. The low cost install high service cost "model" is more a result of the construction industry way of doing things...

mech_head you hit on a point that at times gets overlooked. The technology arguments are but a small part of the picture. Many times comments about this or that technolgy being crap are based on...

The pulse output will provide you with power consumption data (KWh) not demand (KW). Changing the KWh per pulse parameter will change the rate of the pulses but won't do anything for your electricity...

The "auto-magic" you describe assumes a network structure that is aligned with the physical ductwork, which is unlikely. BACnet, LON or whatever the development of tools to assist in system...

The last couple of posts have struck a chord with me. We all know the the problem of poor commissioning that continues to dog the industry, it is an discussion that deserves a thread of its own.
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Bennyk,

I think you need to spell put a bit more what you're question is. Speaking generically I would say that if you are just using pneumatic actuation then nothing is different between...

Smells like a Dorothy Dixer to me! Looking into the future of this thread I see 40 - 50 plus replies, vented spleens, hyperbole plus plus. If you are really looking for solid information good luck...

HVAC Controls and Systems - Levenhagen and Spethmann (McGraw Hill)

The Honeywell Grey Manual is a very comprehensive reference and a deifinite must have.

The short answer is NO. The longer answer is that as a physical communications layer LON may comply but there's no way you would be sending BACnet packets down a LON wire.

So I would be looking...

Nhilar,

I think for that sort of load you really would be best advised to install a contactor to switch the load and use any standard thermostat to switch the control line to the contactor. If you...

A note of caution particularly for those new to controls. While I have no reason to doubt Integrator's skills and technology has given us great options for remote diagnosis, there is no substitute...

Glad to be of help!

Stay cool, not that you've got any choice in the wrong half of the world!

Port 1 is the main air supply from the air station and Port 3 goes to the mains controls for the Air Handler. When de-energised the the mains air to the control circuit bleeds out through port 2 and...

Your'e problem may be that the address you are using is out by one. For example the client device may have its address map start at 1 but the master device assumes a base of 0. This is a problem that...

qtip is correct, using JDE (if using R2 Tridium) or AX quivalent you can learn the BCU and this will give you all the AI, AO, BO and BI. It is very straight forward. You should only need the Network...

Thanks for the info, the reference http://tristate.apogee.net/cool/cxfrc.asp
helps. I am going to get the original specification soon so hopefully I can get to the bottom of exactly why series...