Filter Drier Basics w/ Chris Reeves

HVAC School - For Techs, By Techs

Bryan Orr

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

4.8 • 985 Ratings

🗓️ 19 September 2017

⏱️ 42 minutes

🔗️ Recording | iTunes | RSS

🧾️ Download transcript

Summary

In today's podcast, Chris Reeves joins Bryan to discuss filter driers, including suction driers, liquid driers, core driers, different media, and basic applications. Filter driers are simple components, but they have plenty of room for misunderstanding within our trade. We refer to Parker-Sporlan Bulletin 40-10 throughout the podcast, and you can read that bulletin HERE.

Above all, filter driers act as filters that prevent debris from reaching the expansion valves and destroying them. As such, the best place to install a liquid filter line drier is as close to the expansion valve as possible. These filter driers also catch and hold water from the system; they minimize moisture to keep HVAC systems functioning properly. Filter driers also catch and remove acids from the refrigerant circuit. A filter drier and its desiccants CANNOT remove non-condensable gases.

However, filter driers should NOT be the primary method of removing moisture. Proper evacuations with deep vacuums should be the main method, as filter-driers are limited in their moisture removal capacity. You also don't want to use a filter drier that has been exposed to atmosphere any longer than a few minutes; the drier has had time to collect moisture and will be less effective. Each time you open up a system, removing the filter drier is the best practice.

We use biflow filter driers on heat pumps. The refrigerant can flow in both directions; a check valve directs the flow, so the flow always goes through the core and filter pad the same way, regardless of operation mode.

Suction line filter driers are for older HVAC systems with issues. You'll want to install them close to the compressor for maximum protection and watch the pressure drop across the drier.

We also discuss:

Temperature control
Overheating driers and exposing them to heat
HH-style filter driers (with activated carbon)
System sizing as a consideration
Burnout and contamination

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Transcript

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0:00.0	The free training provided by the HVAC School Podcast is made possible because of the generous
0:06.0	support from our sponsors, Testo, Rector Seal, and carrier. Quick fun fact. The Measure Quick app now available on iTunes and Android is awesome. If you listen to this
0:26.2	podcast for any amount of time you've heard Jim Bergman come on the
0:30.0	podcast and Jim is actually the founder of Measure Quick as well as a lot of other things and Jim
0:34.0	actually many moons ago actually worked with Testo. Testo is the first hardware that works directly
0:41.8	with the Measure Quick app and you may say
0:43.7	what's so special about Measure Quick well I could explain it to you I could tell you
0:46.9	all about measuring delivered capacity
0:49.7	measuring sensible versus latent,
0:52.5	giving you diagnostic probability of different faults,
0:55.6	as well as explaining those faults
0:57.1	and training you on those issues just in time,
1:00.5	on a just in time basis, which is what we're all about here at HVAC school.
1:04.8	And the Testo Smart Probes and the Testo Smart Probes app are some of the first smart tools
1:10.1	to work with the Measurejerkwick app.
1:16.0	And so you may ask yourself, well, why wouldn't they do it? Well, I'll tell you why most manufacturers,
1:18.0	or I shouldn't say most, but why many manufacturers don't want to work
1:21.0	with a third-party app, a third-party software like
1:23.8	Mejerkwick, even though it is an industry-changing software, it's because
1:27.7	it's competitive with the softwares that they've already built, right? I mean they've
1:31.1	already made these applications and while they may not be as full
1:33.7	featured as what Jim's built with Measure Quick it's hard to kind of bite that
	...

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