Short #9 - Commercial Maintenance

HVAC School - For Techs, By Techs

Bryan Orr

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

4.8 • 985 Ratings

🗓️ 24 May 2018

⏱️ 10 minutes

🔗️ Recording | iTunes | RSS

🧾️ Download transcript

Summary

Today's short episode covers five things residential techs need to consider when tasked with doing maintenance on a commercial system. We mostly talk about light commercial package unit maintenance in this episode.

If you come across fresh air filters, be sure to wash those. Some commercial units have economizers that bring in fresh air, but not all fresh air is high-quality. Wash those filters to avoid pollen and other types of outdoor gunk buildup.

Then, you'll want to check and adjust belt tension. Make sure you adjust the belt in each direction correctly; don't get them too tight. Otherwise, you might break or stretch the belt. You may also wear out the bearings or cause higher amperage on the blower motor. In general, you want the belt to be tight enough not to slip off and no tighter. We recommend using the Browning belt tension tool. You may also consider replacing the belt if need be.

You'll also want to align pulleys. Don't just align the edges; align the entire pulley. If you're dealing with sheaves, you can adjust those to tweak your CFM rate. Make sure the motor mounts are square, too.

The next maintenance step is familiar with residential techs: properly wash the condenser coils. However, you may have to "split" the coils; you'll pull them apart and put them on a piece of wood as you separate them. Even though it sounds difficult and time-consuming, splitting the coils is the only way to do a thorough cleaning.

Lastly, you'll want to check the phase balance on three-phase equipment. Phase imbalance can lead to the death of a motor; more than 2% of imbalance can cause issues, and 4% indicates a severe problem.

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Transcript

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0:00.0	Hey, this is the HVAC school podcast. I'm Brian. This is the podcast that helps you remember some stuff, okay? That's what it comes down to. We're going to even abbreviate the intro. Just helps you remember some stuff. In today's episode is about five things to
0:15.0	consider when doing a maintenance on a commercial package unit or at least a
0:19.2	light commercial package unit because some package units can get pretty big
0:21.7	there's some similarities and maybe some differences depending on tonnage and brand,
0:25.0	but we're going to go over five things. We're not going to go over everything, just five things, all right?
0:30.0	So, chill.
0:31.0	But first I want to thank our great sponsors, carrier, Mitsubishi Electric
0:36.7	cooling and heating. I also want to thank UEEI and the Hub Smart Kit, but also the
0:41.2	WRS scales. If you haven't looked at the wireless
0:43.7	WRS scales from UEEI and Arbiter, my friend Adolfo over there is the designer of
0:48.8	the WRS Scales as well as the Hub Kit. I would encourage you to take a look at them because they're really
0:53.6	good scales. I really like them. The scales I prefer at my company Kalo Services.
0:58.0	And you can find those by going to UEEI test.com. Also big thanks to refrigeration technologies at refrigge tech.com,
1:05.0	re frig tech.com, makers of all kinds of great chemicals.
1:10.0	They really try to make them safe, good for the environment, and effective in the field.
1:14.0	That's what refrigeration technologies is out to do.
1:16.4	John Pastorello, I met him at AHR and we've interacted on email a few times.
1:21.7	He's given me both positive and negative feedback on things that I've said in the past and I appreciate that and then also air oasis makers of the
1:29.1	bipolar and nano air purification products if you haven't taken a look at these products yet, then I would encourage you to do so.
1:35.0	If your distributors do not sell these products, then I would ask them why not? Because they are good products.
1:40.0	They're made in the USA. Very, very good companies.
1:42.6	And then also BizPow.org
	...

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