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The latest industry insights from the pros at AirReps.

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ONICON Insertion Turbine Meter Diagnostics

Here at AirReps, our team of HVACR experts hears it all! We’re always answering questions about HVACR systems that are facing issues in running properly. Every so often we get a call from a customer wondering why their turbine meter isn’t working, or why the flow rate is significantly different than what they might expect it to be. When it comes to these complex challenges, there are usually two scenarios that cover 95% of these...

Tom Mahrer

March 2, 2026

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ONICON Insertion Turbine Meter

ONICON Insertion Turbine Meter Diagnostics

Here at AirReps, our team of HVACR experts hears it all! We’re always answering questions about HVACR systems that are facing issues in running properly. Every so often we get a call from a customer wondering why their turbine meter...

Tom Mahrer

March 2, 2026

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BACnet, VFDs

Ways to Program a Run Status for the VFD on an HVAC System

The entire team here at AirReps, which now includes the Control Products Group division, is dedicated to helping customers and partners with all of their HVAC needs, 24/7. That’s why when we had a customer reach out with an issue on their HVAC...

AirReps

February 18, 2026

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Rebel Heat Pump

DAIKIN Rebel Heat Pump

How to Handle 100% Outside Air Without Fossil Fuels Even at -10 °F  Designing HVAC systems for 100% outside air in cold climates has always been a challenge. When ambient temperatures drop below freezing, most DOAS heat pumps lock out...

AirReps

January 22, 2026

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VFDs

Using the jog mode on Danfoss VFDs

Recently, we had an interesting inquiry from a customer about having a VFD go to a preset speed from a single input. In this case, that would pre-empt the speed the drive is being commanded to in normal circumstances.   For...

AirReps

December 10, 2025

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BACnet, VFDs

BACnet and Digital Inputs for VFDs

If you’ve read our blog for a bit, you will have most likely realized that many of our topics come from the inquiries of customers and partners. Instead of helping just one customer at a time, we developed blog posts...

AirReps

November 24, 2025

Daikin VRV Cover Photo
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...

Matt Bayley

November 18, 2025

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