Do you even CAZ test? w/ Jim Bergmann

HVAC School - For Techs, By Techs

Bryan Orr

Training, Careers, Airconditioning, Self-improvement, Hvac, Business, Education, Refrigeration, Heating, Ac, Apprenticeship

4.8 • 985 Ratings

🗓️ 25 October 2018

⏱️ 36 minutes

🔗️ Recording | iTunes | RSS

🧾️ Download transcript

Summary

In this first part of the two-part combustion analysis series, Jim Bergmann covers CAZ testing or worst-case draft pressure testing in detail. He also explains why it matters to techs and customers. Once again, MeasureQuick will come in handy if you do CAZ testing in the field; Jim Bergmann is working on automating the testing process in his app.

CAZ (combustion air zone) testing will benefit the customer in both safety and efficiency. A proper CAZ test will also likely increase the furnace system's longevity. This test identifies if there is a high potential for flue gas spillage. We want to check if the appliance is installed in a space where it can easily and safely vent combustion gases. Other appliances can potentially give off exhaust, and they may impede a combustion appliance's ability to vent properly.

Worst-case draft pressure testing is a way of making sure that we have enough combustion air in a room for an appliance to operate safely. Some sealed combustion appliances can potentially suffer negative impacts of depressurization, which is dangerous despite the sealed combustion.

First, you want to measure the CAZ pressure with respect to the outdoors. Then, you turn the air handler on and measure that pressure again to identify possible duct leakage. After that, you close the interior doors and measure the CAZ again. Redo all three of these steps to produce the highest negative pressure. You can measure your pressures with a good manometer or the draft gauge on your combustion analyzer; ideally, your tool's resolution will read tenths of Pascals.

Jim and Bryan also discuss:

Pressurization and pathways
Radiant heaters and other appliances
Disconnected supply
Sealed and unsealed base pans
Exhaust pipe ventilation
Temperature-draft relationship
Water heaters
Resolution, accuracy, and precision
Measurement tools

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Transcript

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0:00.0	and This episode of the HVAC School podcast is made possible by our excellent sponsors.
0:21.2	Carrier and carrier.com carrier makers of lots of stuff.
0:25.0	You don't know who carrier is and I don't know where you've been, but they did a little thing called inventing air conditioning.
0:30.0	That's Willis carrier, but we are carrier dealers here in Central Florida and we're very
0:34.4	thankful to be partnered with them in Carrier Enterprise. Find out more by going to carrier.com
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0:58.2	no of course they're not corded flaring tools but there are manual flaring
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1:44.6	solder weld and you also should be able to find it at a distributor very soon
	...

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