Problem controlling Carrier chiller over BACNet interface

[MathMan]

Hi,
I have a Carrier chiller connected to a BACNet network. I need to change the setpoint via the network using Delta's ORCAView, but I can't figure out exactly which variable will do the trick.
Any help would be appreciated!

[blackbelt3677]

OK, Carrier makes many chillers!! Little more info and we might help you.

[jogas]

I just commissioned two new 150 ton Carrier screws, both with Bacnet interface cards. Each chiller had 3 setpoints....unoccupied, occupied, and (I think) Ice Making setpoints on the chiller display and the Bacnet points were setpoint 1,2,& 3.
Anyways, any setpoint I write to changes on the display, but the chiller keeps on using the 45* effective(?) setpoint.
When the Carrier Tech came out to flash the Bacnet boards, he said he did not have any Point Doc info. I really found that hard to believe, but we're not resetting CHWS temp, so it's a rear burner issue for me right now.
As this job has several types of Carrier chillers, does anyone know if any interface point Docs exist? We're a Carrier dealer, so I'd think we should be able to get Docs if available.

[kontrolthis]

Generally in the back of the service literature book there are tables with all the point names. Next to them will be a description (r) read or (r/w) read/wirte. The r/w are normally the points that appear in bold on the carriew comfrot view screens also.

Hope this helps.

[Ausccn]

Gents,

The Carrier LEI (Local Equipment Interface) is an add on module that reads the information out of the Carrier controller/chiller that it is connected to. As default they do an AUTO map to the device that they are connected to and having 60 points available ( except for the LON interface). A carrier chiller or device can have (in a chiller) 200 points + available for mapping so the interface grabs the 1st 60 points that are available.

Now.......Carrier chillers are divided into tables for their point displays and the 1st display table that they grab depends on what type of chiller it is (US or French etc) I dont know why but usually the main table that is first automatically mapped does not include both CHW leaving & entering temps (which is what most people want to read).

So to get the entering temp + they have to be manually mapped. Which either needs a Carrier Tech to do or if U have the Carrier software it must be manually done by disabling the AUTO MAP configuration and copy & paste the appropriate point data into the LEI table.

I have seen sooooooo many POST's on this website about this issue. If U dont have the Carrier software & can map it yourself then it is going to require a Carrier Tech (or the like) to do this for you. And if U want to be able to write to Carrier points then the chiller must be running in CCN mode for this to happen.

[joey791]

I just programmed a modbus card this week.

This is only the second job I have done with a translator card, the first one Carrier programmed. We bought the software on the job and after messing with the card, I programmed this job. Did not know about the CCN setting for setpoint reset. I do find it unusual though that on the RTU's you can R/W the Occupied point to bring the system on but on the chillers Occupied is just a status and you have to R/W to Chil_S_S.

[simsd]

Gents,

The Carrier LEI (Local Equipment Interface) is an add on module that reads the information out of the Carrier controller/chiller that it is connected to. As default they do an AUTO map to the device that they are connected to and having 60 points available ( except for the LON interface). A carrier chiller or device can have (in a chiller) 200 points + available for mapping so the interface grabs the 1st 60 points that are available.

Now.......Carrier chillers are divided into tables for their point displays and the 1st display table that they grab depends on what type of chiller it is (US or French etc) I dont know why but usually the main table that is first automatically mapped does not include both CHW leaving & entering temps (which is what most people want to read).

So to get the entering temp + they have to be manually mapped. Which either needs a Carrier Tech to do or if U have the Carrier software it must be manually done by disabling the AUTO MAP configuration and copy & paste the appropriate point data into the LEI table.

I have seen sooooooo many POST's on this website about this issue. If U dont have the Carrier software & can map it yourself then it is going to require a Carrier Tech (or the like) to do this for you. And if U want to be able to write to Carrier points then the chiller must be running in CCN mode for this to happen.

Ausccn is correct, about the "Automapping" feature grabbing up to 60 points. He was able to help us understand this on another job. The 60 points are random - so you cannot choose which ones you want unless you have some sort of interface device. We bought Carrier Service Tool V. We had a CCN to BACnet converter card on some newer Package untis that had a Comfortlink controller.

The Service Tool allows you to see the CCN side (we are assuming the Carrier side is or has a CCN connection available).

What we had to do was find the point locations on the CCN side first and write down their locations. There are multiple "Tables" on the CCN side that we had to search through to find the points we wanted, but ultimately they were there. Once you find them, you map them into the BACnet side of the converter card. To tell you the truth, the whole software interface through the Service Tool is pretty Mickey Mouse looking (not a criticism - just an observation) and is simpler than you think. If you buy it you will discover a lot of other points that you may want to bring in and replace with some of the more useless points that are Automapped.

If you have as many chillers as you say you do, get some sort of Carrier interface. The Service Tool V was fine for our needs and now we have it forever and never have to worry about being locked out of Carrier equipment. I didn't think it was that expensive given that we now have it forever.

One other thing I forgot - this is from the Carrier BACnet Modbus Translator Manual. I have a copy of it in pdf if you want it.

Note: To modify the BACnet/MODBUS Carrier Translator’s
BACnet/Modbus address, a Carrier user interface (such as
ComfortVIEW or the Network Service Tool) must be used.
The device has a default address of 16 on the BACnet or
Modbus side.

So as you add more chillers, the addresses will all be 16 unless you change them.

You need to confirm if Service Tool V will work on a chiller. Let me know if we can help.

[AutoPilot]

I just did a project with Delta Controls and Carrier Chillers. I had to have the Carrier Tech address his controllers correctly, so I could see them on the network. After that I could see all the Chiller points in navigator, but could not start or stop the chillers. I had to have the jerk come back and put his controller in CCN mode.

[simsd]

BUY THE SERVICE TOOL.

We had the exact same problem.

You see, here's the deal.

Unless you tell the Carrier guy the points you want, he won't map them in.

Unless you have the Service Tool, you won't know what points are available.

You might be able to find something in the Installation Manual that has all of the CCN points listed in the Mapping Table in the back of book.

[joey791]

What service tool are yall talking about? Anyone have a link? I used Comfortview to set up my card. I noticed on the chiller I set up this week(small Aquasnap) there was a list(special section) in the back of the manual with all the Bacnet and Modbus points available in it. I had not seen this list in any manual before.

I couldnt upload the manual because of size but check out page 91 Appendix C in the Operations manual.

http://www.commercial.carrier.com/co..._PRD40,00.html

[simsd]

joey791

That's it. I believe you should have no problem looking at those Tables from Comfortview.

Look on the left hand side and it tells you the Table (IE: A_UNIT) and then under POINT you will see the name of the point as it will be described in the Table in Comfortview.

The Data Port is/was a read only device from Carrier to whatever system you might be using (Modbus etc) and as you can see the DataLink gives you read/write capabilities. The BAClink follows in the tradition of the DataLink but with less points for some reason.

Because the BAClink grabs 60 random points, you will get points from these tables but who knows which and why they grab them.

So now you know what you can find. Once you find them, you manually have to "map" the point name into the BAClinc or whatever card you are using side of the card.

The "service tool" is called Carrier Network Service Tool V. It is a USB to RS-485 converter with a software disk.

[Dallas Duster]

Joey you can use Comfortview NSVT-5 is not necessary.

[joey791]

Thanks, for the info. I had some problems programming my first card earlier last week but for those that dont know, the yes/no values have to be copied and pasted to change the values, took me about 25 minutes to figure that one out