Intro to Manual J & S w/ Jack Rise

HVAC School - For Techs, By Techs

Bryan Orr

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

4.8 • 985 Ratings

🗓️ 12 April 2018

⏱️ 48 minutes

🔗️ Recording | iTunes | RSS

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Summary

In today's podcast episode, we talk with system and duct design educator Jack Rise about ACCA Manual J load calculation and Manual S system selection.

Many people know about Manual J, but relatively few techs follow it properly. When people attempt to do Manual J calculations, many of them go wrong when they overestimate the difficulty of the equations in Manual J. However, many of these techs do better when they can use software like Wrightsoft to help with their load calculations. The best way to approach load calculations is to develop confidence in software programs and field experience (sizing equipment and sealing ductwork); you are more likely to make mistakes if you put all of your confidence in one or the other. Some techs also don't take the time to measure buildings properly if they are either over-reliant on technology or too confident in their field skills.

Manual S is all about equipment selection after the load calculation. However, much of the manual is not useful for fieldwork. The rules are also not as regionally thoughtful as they could be, especially regarding furnace sizing and the consequential heat loss. Manual S is only useful if you perform a Manual J calculation first and use that result as a guide. Rise does not believe that Manual S is bad, but he thinks it gives installers way too much leeway on sizing as it stands.

Jack and Bryan also discuss:

Wrightsoft
Manual J practices in different types of buildings
Envelope leakage in retrofit applications
Most important chapters of Manual S
Accounting for sensible and latent heat load
New ventilation requirements
Odors, cooking, and building design
Increasing airtightness in building construction
Encapsulated attics

Learn more about ACCA standards and codes at acca.org.

Learn more about Wrightsoft HERE.

If you have an iPhone, subscribe to the podcast HERE, and if you have an Android phone, subscribe HERE.

Transcript

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0:00.0	This episode of the HVAC School Podcast is made possible by our excellent
0:17.8	partners carrier and Mitsubishi Comfort. Also along the lines of today's episode, which is about Manual J and Manual S.
0:28.0	I recently got a blower door from Retro Tech as well as a duct leakage tester from Retrotech and I've been
0:34.1	really impressed by these products as well as the precision monometers that come
0:38.8	with them like the gauges that come with them you know we're just getting more into the building science
0:44.3	building performance you know advance measurement field at my company Kailos and
0:48.2	I'm surprised at how easy these tools make it to do I mean it really isn't that bad. You go through their
0:54.0	training, they have a good kind of pre-training where they talk about the products and how they
0:57.8	work and how to assemble them and disassemble them and keep them from breaking on you.
1:01.0	But really I'm impressed by how rugged they are, how easy they are to use. And you know, like doing a blower door test. I always thought that was a really big deal and we're finding we can do a blower door test fairly easily. It takes us about 20 minutes to do it so far even. We're not even that good at it yet.
1:14.9	So big thanks to Retro Tech for making a great product and also I want to mention
1:19.7	TESTO. I've been using the 440 I, which is a advanced airflow measurement and indoor
1:27.0	quality test kit that you can get with different either Bluetooth or wired
1:31.8	devices for measuring airflow with a hot wire. with different
1:34.0	Bluetooth or wired devices for measuring airflow with a hot wire,
1:35.0	mini vein, large vein anemometer, a bunch of different attachments
1:38.0	and I've been using that a lot for airflow measurement.
1:40.0	A really nice tool and then the test of 440 air capture hood is just a nice light easy to use accurate
1:47.6	airflow hood that you can use in your company even if you don't you don't have it on every truck you can get
1:53.4	maybe one to serve the entire company and then that way when you do a do a retrofit or
1:58.3	something and you're adding in some ducks or making a change to a duck system you can
2:01.4	go in and confirm or if you do new construction you can also
	...

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