Pressure Measurement Pro Tips w/ Steve Rogers
HVAC School - For Techs, By Techs
Bryan Orr
4.9 • 1K Ratings
🗓️ 4 November 2021
⏱️ 36 minutes
🧾️ Download transcript
Summary
In this podcast, Steve Rogers from The Energy Conservatory explains some pro tips for pressure measurement.
There are three common types of pressure measurements: absolute, gauge, and differential. Absolute pressure is the pressure in a particular space in reference to a complete vacuum. (All absolute measurements use the zero point as a reference.) Gauge pressure uses atmospheric pressure as a reference point (which varies with altitude and location). Differential pressure relies on two connections (one of them is a reference point to the other).
The Energy Conservatory recently designed a manometer (DG-8) that differs from the standard manometers. The purpose of that manometer is to make pressure measurements in a more cost-effective way. Most manometers have similar sensors (diaphragms move with pressure, and the measurement read is the resulting difference in resistance). However, the DG-8's methodology can help it yield much more accurate measurements.
When dealing with small pressure measurements (like Pascals), the DG-8 is one of the most accurate manometers you will find on the market.
When you look at room pressure, keep in mind that pressurizing one room will depressurize another. Temperature differences also impact the pressure, and the HVAC unit can cause differences in pressure to arise as a result of temperature differences. When you run the kitchen or bathroom exhaust and expel a lot of air in your home, you can also bring the home under negative pressure; that can even cause your water heater to backdraft.
Steve and Bryan also discuss:
- Blower door manometers vs. DG-8 manometers
- Pascal scale
- Room pressures and air paths
- Infiltration and its effect on load calculations
- Dominant duct leakage
- Combustion appliance zone (CAZ) testing
- Mechanical ventilation and pressure
- Orphaned water heaters
- DG-8 and the TrueFlow grid
Learn more about the DG-8 HERE.
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Check out information on the 2022 HVACR Training Symposium at https://hvacrschool.com/symposium/.
Transcript
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| 0:00.0 | The HVAC School Podcast is made possible by these brand partners. |
| 0:09.1 | Carrier at carrier.com. |
| 0:11.7 | Refrigeration Technologies at Refrigge Tech.com. |
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| 0:40.7 | Navac and Navac Global.com if you haven't taken a look at the NRD C4M recovery machine. |
| 0:46.8 | It is a four cylinder recovery machine. |
| 0:48.8 | Literally the fastest recovery machine that you're going to be able to buy from a supply house is the NRD C4M. |
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| 1:00.9 | at check out if you are in the commercial side or industrial |
| 1:03.6 | sides of the industry especially you're going to want to take a look at the |
| 1:06.7 | NRD C4M from Navac. I'm going to talk for a second about the coil shot from Speedplane. |
| 1:14.6 | Coil shot from Speedplane. |
| 1:15.7 | Coil shot are these tablets that go into a special gun. |
| 1:19.6 | You can take a look on YouTube. |
| 1:20.7 | We've done some videos on them, how to clean coils with them. |
| 1:23.4 | It's a really interesting way of limiting the amount of cleaner that you use and kind of better |
| 1:28.3 | controlling that, especially for people who are going to be doing a lot of simple |
| 1:31.6 | maintenance cleanings. I can see it being a really effective tool for that to put on a truck of maybe a maintenance technician something along those lines and it comes with a special applicator gun. You slide the tablet into the gun and you're ready to go. You don't need anything else. |
| 1:44.8 | You just switch on the side of the gun between rinse and chemical apply. |
... |
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