Cased Coil Misalignment

By April 26, 2019

Cased Coil Misalignment

On occasion, you will either find a furnace or be tasked with installing a furnace where the coil overlaps the edge of the furnace because the coil is wider. In the case of a Carrier CNPVP coil, you need to ensure that you align the coil according to the manufacturer's specs, or you risk cutting off about 1/3 of the airflow.

The best-case scenario is to use a coil that is a sizer match for the coil, or you can buy or make a tapered metal transition between the furnace and the coil. In the case of the CNPVP, the manufacturer allows the coil to be offset to the left.

In this video, we illustrate replacing a leaking coil and reconfiguring it in the proper orientation.

—Bryan

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Real training for HVAC ( Heating, Ventilation, Air Conditioning and Refrigeration) Technicians. Including recorded tech training, interviews, diagnostics and general conversations about the trade.

Jason Obrzut comes on the podcast to discuss A2L refrigerant facts. Jason is a member of AHRI’s Safe Refrigerant Transition Task Force and author of the RACT manual.

ASHRAE designates refrigerants into categories based on toxicity (A or B) and flammability (traditionally 1, 2, and 3). So, the new A2L designation indicates that a refrigerant is relatively non-toxic but has a flammability value between 1 (low) and 2 (moderate). While propane (R-290) is a good refrigerant because it is natural and has low toxicity, it is very flammable (A3).

Future refrigerants will likely fall under the A2L designation; the mild flammability will probably be the tradeoff for efficient, low-toxicity refrigerant with a low environmental impact. However, A2L refrigerants cannot be vented, even despite their low GWP. We also cannot use these refrigerants in retrofits.

A2L refrigerants will likely become much more prevalent around 2023 as HFC refrigerants phase down. The phase-down period will be specified shortly, and it will begin with a 10% reduction; the specific parameters of the phase-down have yet to be set.

When working with A2L refrigerants like R-32, you can expect little to no change in how you work on equipment if you’re already employing the best practices. Sizing and capacity will hardly change in the residential market. In the commercial sphere, these systems still look and operate quite similarly to current units.

Jason and Bryan also discuss:

Refrigerant detection systems (RDS)
Flowing nitrogen and other best practices
Non-A2L HFC alternatives
Left-handed threads
Non-standard safety practices
R-32 properties
Refrigerant glide

To learn more about A2L refrigerants, check out the AHRI Safe Refrigerant Transition Task Force’s webinars, newsletters, and fact sheets at ahrinet.org/saferefrigerant.

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Check out information on the 2022 HVACR Training Symposium at https://hvacrschool.com/symposium/.

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