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The latest industry insights from the pros at AirReps.
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Simplifying Hydronic Decarbonization with Nyle Tero Air-to-Water Heat Pumps
As commercial buildings move toward all-electric heating and cooling, air-to-water heat pumps (AWHPs) are becoming an increasingly important option for hydronic system design. For some applications, VRV provides an efficient and flexible path to electrification. In others, a hydronic approach may be a better fit. With an AWHP system, the refrigerant circuit remains at the outdoor equipment and water becomes the distribution medium inside the building. This changes where refrigerant is located, but it does...
Colin Holt
September 14, 2026
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Tero™ 20 | Tero™ 40
Simplifying Hydronic Decarbonization with Nyle Tero Air-to-Water Heat Pumps
As commercial buildings move toward all-electric heating and cooling, air-to-water heat pumps (AWHPs) are becoming an increasingly important option for hydronic system design. For some applications, VRV provides an efficient and flexible path to electrification. In others, a hydronic approach...
VRV R-32 EMERION
What Are the Upper and Lower Schrader Ports on Daikin VRV R-32 EMERION Outdoor Units?
If you’ve worked on a Daikin VRV R-32 EMERION outdoor unit, you may have noticed the upper and lower Schrader ports inside the unit and wondered where they actually go — and whether there’s ever a reason to use them. It’s a question that’s come up several times during...
Rebel + Rebel Applied
Understanding A2L Refrigerant Leak Detection and Mitigation in Daikin Rebel and Rebel Applied Rooftop Units
With the HVAC industries transition to lower Global Warming Potential (GWP) refrigerants, A2L refrigerants have become the current standard in commercial rooftop systems. While these refrigerants offer environmental advantages, they also introduce new safety requirements due to their mildly flammable classification. Daikin Applied’s Rebel and Rebel Applied Packaged...
Daikin VRV
Bleeding By Daikin VRV EEVs
What does A9-02 mean? Whenever working on any Daikin VRV system, there is always a possibility of generating an A9-02 error code. This code indicates that an indoor fan coil is experiencing refrigerant bleed-by. In this instance liquid refrigerant is...
Daikin VRV
VRV System Not Communicating? Here’s What We Check First
Whether the system is missing indoor units, throwing U4 alarms, or not seeing devices correctly, the issue is usually related to communication wiring, addressing, or controller setup. Before getting too deep into troubleshooting, we typically start by verifying the communication...
Daikin VRV
Understanding the U4 Error Code in Daikin VRV Systems
Understanding the U4 Error Code in Daikin VRV Systems If you’re seeing a U4 error code on your Daikin Variable Refrigerant Volume (VRV) system, you’re dealing with a communication issue that needs prompt attention. This error is one of the most common diagnostic codes...
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