Search:

I understand these tools tested most accurate. I would also be interested if there are equivalent or better tools out there. New tools come out every day.

Everyone must have the EPA 608 Certification.
Some companies want ICE Certification for 1 year entry level techs.
Many want NATE for 2 year+ techs.
RSES also has a certification.

Certification...

I've been involved in buying and selling a few businesses. If the company has sales under about 1 mil, the owner is basically the company and could go after the customers after the buy sell...

If I were going to buy digital refrigerant analyzers for all the techs, what would I buy. Example the Testo 556 is well over $1000, more than the Testo 550. Both provide simutaneous pressures,...

Which Refrigerant analyzer / gauge manifold, and why.
What tools and features are essential in a gauge/manifold for efficient and accurate charging and diagnosis of residential or small commercial...

We used a trash pump mounted on a two wheeler with appropiate fittings, valves and quick connects. Add a plastic barrell.

I'll take a look, thanks

I give up. Can anyone suggest a Dallas Tx vendor that can fix me up with a working solution?

USB to RS485
Ethernet to RS485
PCMCIA to Rs485

Thanks for all the help.

I'm still investigating all of these.

I did get the Vista drivers for the Keyspan USB x 232 from Tripplite.com I connected a 232 x 485 converter made by 3One Data...

Thanks for the help. Looks like I have several options. I will post my progress.
Thanks again

None of our laptops have serial ports.

I can't get a USB x RS485 converter to work on a Vista laptop. I've tried Belkin and another brand. Anyone have any suggestions?

I've also tried a TCP IP x RS485 converter (BF-430) without...

I saw a new system this week that attaches to a rooftop unit with magnets, covering the condenser coil. It has a wet pad with spray heads and a dry prefilter. The theory is the water evaporates...

Drill test well?
If this is a commercial development the civil engineer has probably already drilled geo test holes to determine subsurface soil types for structural design. You are looking for...

My opinion, most of the industrial and large commercial users already have meters that will record time of use.

The real reason for deploying smart meters on small commercial and residential...

Be happy to share when my deal is locked down. Send me an e-mail, it will be a few weeks.

Ok I ordered an industrial PLC front end with a graphical display, software, built in Ethernet, BacNet and Modbus. Controllers are BacNet or Modbus. Modbus controllers have a drag and drop...

Food for thought..... The power companies are spending billions to deploy smart meters. Why? Open market, on peak power, mid day summer, can go for $100. KWH Off peak nights in west Texas with...

It's definatly a result of overheating and the refrigerant oil. We've flushed at least 40 units over 2 years from one manufacturer.

We like full maintenance because we can do most of our work in the off-season. We treat the equipment like we own it and after several years have few unexpected breakdowns. The margins are and...

I saw this a few weeks ago and signed up for e-mail updates but I have not received any.

It looks like they plan to tie this in with smart meters when they are deployed and you will have a real...

This is essentially what engineers are doing with the chiller beam systems we're starting to see.

You can probably drop the temp to about 5 degrees above the dewpoint. One concern would be reducing the airflow significantly. The fan is designed for open air, no restriction or friction loss. I...

Cutting edge schools are using 100% outside air energy recover ventilators with displacement air distribution. Exceeding ASHRAE 62 for fresh air by 30%

1: New Construction? Existing?
Existing for now. New construction soon,

2: If existing..does it have any DDC equipment?If so... Is it Staying? Going? Dont know the options yet?
No existing...

What's open protocol to you?
modbus ... bacnet?

What energy management techniques are you interested in doing?
Would like an easy drag and drop block programming with the ability to write our...

We have used pace scientific and the Onset Hobo. Pace is a 4 channel with great software , shirt pocket size but cost 10 times the price of a Hobo. Really good if you need all 3 legs on 3 phase....

If you can get a curve for that coil from the manufacturer you can use the water pressure drop across the coil to determine GPM flow and read capacity.

When you have that, calculate 1 btu to lower...

1 BTU to raise the temp of 1 pound of water 1 degree.
Convert pounds of water to gallons.
BTU per gallon x temperature difference

Are you looking for capacity? You can do the calculation on the indoor unit with delta for temp and grains of water or you can use the delta on the outdoor unit with just sensible if you know the...

We work on a brand of frozen frapachino machines and would be interested if the offer is still open.

We have a customer with stand alone pastry cases. The condenser is below the case and gets dirty really fast. The unit overheats, oil turns to paraffin and stops up the TXV and gets distributed...

I think the current LEED standard and ASHRAE 62.1 2007 for demand ventilation is 600 PPM CO2 plus the measured exterior CO2 PPM. If you don’t have demand ventilation then you must have constant...

For measurement and verification of energy savings the IPMVP international performance measurement and verification protocol. They have a website and the standards can be downloaded for free. Make...

What manufacturer would you recommend for DDC or PLC. Low up fron cost. Buildings under 100,000 sf. Building automation and energy management, open system protocol. Easy to design algorithm's,...

I've put in verticle wells, lake loops (slinkies) verticle runs and have an open system on my farm for the last 15 years. I use the waste water on my farm for irrigation.

Most of the commercial...

There are significant differences in the heat exchange rate for earth coupled condensers. This size project you should drill a test well and measure the rate of heat exchange.

I have been using an open loop geo in Texas for about 15 years and have put in several closed loop and lake loop systems. My groundwater temp is 59F. Rule of thumb is 3 gpm of condenser water per...

I've seen evaporative spray systems for condenser coils. Fouling or erosion of the coil or fins can be a problem. Why not put in an evaporative condenser?

Are there any good basic reference materials out there that explain the logic and show examples for common logic blocks for controling HVAC and energy management?

I have a thermostat that communicates in modbus. I want to set up a pilot project to communicate and control from a PC. Any recomendations for software that contains HVAC logic for modbus?