Arzel Zoning
There’s been a big change in HVAC this year with the introduction of A2L refrigerants. By now, most of our customers have done some kind of training on R-32 or R-454B refrigerant. The new class of refrigerants does have some impacts on zoning. Here’s what you need to know about HVAC zoning with A2L refrigerants.
Indoor coils that are designed for A2L refrigerants have mitigation controls that respond if they detect a refrigerant leak. These are important because A2L refrigerants are mildly flammable. If there is a leak, the system needs to respond by dispersing the refrigerant.
According to UL, when an A2L refrigerant leak is detected, all zoning dampers need to be opened. When you’re installing A2L equipment with an Arzel Zoning system, you’ll need to add a relay to accomplish this functionality.
To add the necessary functionality to an Arzel Zoning system, follow the wiring diagram below. You will wire a double-pole double-throw relay to the mitigation board and the Arzel Zoning panel. This will shut off the panel and open all dampers in the event of a refrigerant leak.
Download A2L Mitigation Wiring Diagram
Okay, so you added the relay for A2L mitigation. Now what? Here’s what will happen if the A2L control detects a leak:
If you’re working with Trane or American Standard equipment, you may not need to add the relay. These brands have mitigation boards with extra contacts that you can use to wire the mitigation board to the Arzel Zoning board. Here’s how you can wire the Arzel Zoning board to A2L mitigation boards that have these extra contacts.
Download Trane A2L Mitigation Wiring Diagram
Download American Standard A2L Mitigation Wiring Diagram
We are working on adding a circuit to our new products that will directly connect to the mitigation board in the equipment without the need for a relay. Right now, you’ll need to use the wiring diagram above to add that functionality.
There’s been a big change in HVAC this year with the introduction of A2L refrigerants. By now, most of our customers have done some kind of training on R-32 or R-454B refrigerant. The new class of refrigerants does have some impacts on zoning. Here’s what you need to know about HVAC zoning with A2L refrigerants. […]
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