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If you dont mind - me too?

Are the building heat valves on DDC? Maybe a strategy to gauge building demand via valve positions? Or possibly watch the delta T, warmer return indicating low load and time to stage off (and don't...

Those are the fuses for the control transformer primary. One fuse remains, and the TX is a single-phase load, so it's still protected against overcurrent. If the transformer primary were to go to...

Just curious, how is not running the low side to the fan inlet a Honeywell product issue? I have used hundreds of them, they are a simple diaphragm switch like everyone else's and have always worked...

Yesturday I cudnt evin spel engineer - today I ARE wun!

btw.... welcome to the forum, BMS!

Is this a DIY project, or commercial? If it's something you're just experimenting with, then something like this could fill the bill:

http://www.mydtcstore.com/ (specifically the TinyDTC)

In...

I type too slow.....

Sent from my ADR6300 using Tapatalk 2

One BTU is the heat required to raise one pound of water one degree F. To use BTU as a unit of energy it is expressed as BTU per hour, or Btu/h.

One ton of refrigeration is equal to 12000 BTU/h,...

Ok,here's my two cents worth. Start with the opening closed (how else will you get the two rooms to their respective temps?). Gently open. The colder air is denser, and so will tend to flow over the...

Joe, the OP did not say measure, he said calculate. I (and others I imagine) think he is asking if the sling psychrometer (or other means of measuring WB) is needed to calculate the target SH or SC,...

That is very cool! I wonder what the whole machine costs?

The response time is what it is, not adjustable as far as I know.

Just the one space is doing it, but all units in that space are? I have had issues where the space static pressure was wrong, and the differential pressure pulled air out of the wall cavity and...

How stupid... gotta use orange wall anchors for that wire size.

For an unbalanced (120V) load the neutral carries the exact same current the hot does...

Aluminum?

That is just painful to watch...

I wasn't allowed to get my license until I already had a job and had saved enough to start paying my share of the premiums.... of course that was 38 years ago.

I just did a chiller replacement job where the old chillers were replaced with new Trane CVHE's. It was the first time I had seen the Adaptiview touch-screens on the little arm (very nice), and also...

I guess I've lived a sheltered life, have never seen this done. Seems like a soft-starter would be more cost effective than a VFD.....

One of my customers has a total of 6 York YK's, 900-ish tons...

You're going to feed an otherwise constant speed machine with a 3rd party VFD? Interesting. I wonder how the chiller's motor protection, etc. will react. Does Trane know about (and approve of) this...

Costco - been a member since 1984. Wife had a Sams card, let it lapse in favor of Costco.

The tables imply it, but no one has mentioned it, there are two common 10K RTD's - type II and type III, best to use the table that matches your particular sensor. acsj's table lists them both.

That's one of those ideas that make you slap your foerhead and wonder why didn't I think of that! Great idea!

Um, Lon? You may not have a Cbus at all. XL800 controllers can also integrate via Lon, in which case you are talking about a whole different animal, involving an LNS database and such.... (which...

Lantronix UDS1100 - I use 'em by the bucketload. Works great.

Forgive me if this was mentioned, I didn't see it - as I remember, to enter AT codes, you first had to get the modem's attention by typing plus three times in rapid succession "+++".

Welcome Dehno!

I found several examples of Excel to OPC server software by doing a Google search. Perhaps you could get the vendor or custy to run one, and import the data into the Jace via OPC?

Hi acddc,

I have used an L-VIS (the BACnet flavored one), but have not used both network ports. It's true, you can create a ring topology, but only if you use a switch that supports Spanning Tree...

Nope, it's for daisy-chaining multiple devices together without having to add a switch. The switch is built-in.

Neat! Glad it worked.

If you read the description, it doesn't actually have dual network adaptors. It has two ports and a built-in network switch. No different than any other device with a single NIC plugged into an...

You might check your drive as well. Some, like the ABB ACH550, are programmable to do floating control directly via two DI's (I have not personally tried this though).

Or an AUD module:

http://workaci.com/products/aud-flotating-point-analog-output

If I read the OP correctly his main problem is how to display the speed though.

You don't have to calculate the percentage. Nearly all VFD's that I have seen (at least recently) have a 0-10V analog output that is or can be programmed to follow the VFD speed. There's your...

Here's a reference for purity levels for various grades of CO2 (from the same company hvac5646 used). It lists welding/industrial grade CO2 as 99.8% pure, and less than 32ppm H2O.
...

What is the intended function of the second NIC? Redundancy?

I am so glad you said that. Landmine said VPN but I heard VLAN, my comments pertained to a VLAN, not a VPN - until you typed them both together I didn't realize I was using the wrong term. Funny...

Landmine, have you read Chipkin's BACnet for Field Techicians?

http://www.chipkin.com/files/pdf/Bacnet%20For%20Field%20Technicians.pdf

control$, have you put BACnet devices on a VPN, where otherwise they would have been on different subnets, in lieu of using a BBMD? I could not get this to work. I would be interested if you have.

Thank you, Google Translate!





Marvin, welcome, and I hope you find a good job in Texas!

I have tried VPN's before. Although the IP's and SNM's would imply everyone is on the same subnet (logically), they really aren't (physically). Traffic still has to go through routers, and routers...

I would hate to be in there during a head-on. The airbag would just hold my head in place as everything else beat me to a pulp...

Could also be the sixth week of 2012, weeks more common in date codes.

Presumably your clock has been running, so it probably had an even earlier date when you bought it - but the default date for electronic equipment is almost never related to its manufacture date....

No prob... makes my neck hurt to look sideways! :grin2:

376231

Two employees, according to the Dept of Labor, but the business must gross at least $500K. It says:

Enterprise Coverage
Employees who work for certain businesses or organizations (or...

millertime,

I believe the practice of not paying you drive time is illegal, if you are an employee. If you google "Fair Labor Standards Act" and read up, you will find it says (in part):

Travel...