Mechanical
APR Control®
The suction pressure-activated mechanical valve that turns oversized, staged DX equipment into a system that runs instead of cycling. Continuous capacity modulation, sized to the lead compressor, with nothing to program.
UL Listed · 100,000+ valves installed since 1993
New or existing equipment
APR Control fits both ways: retrofit onto the equipment you already run, or built into new equipment by OEMs, contractors, and third-party modifiers, with no design-day capacity penalty.
What APR Control does
APR Control is an external compressor unloader that adds continuous capacity modulation to DX systems, allowing compressors to run at reduced capacity instead of cycling on and off. With turndown capabilities of up to 80%+ (depending on system configuration), APR Control helps match cooling capacity to the actual load in the space. Its mechanical, suction pressure-activated design requires no programming, controllers, or software maintenance.
Key Benefits
Runs Instead of Cycling
Continuous modulation replaces on/off cycling at part load, where roughly 90% of operating hours live.
Humidity Control
Longer runtimes at lower capacity keep coils cold and remove moisture.
Reliability
Fewer compressor starts mean less wear and longer service life.
Passive Freeze Protection
Evaporator freeze protection is passive, no add-on controls.
Models and Specs
APR Control is sized to the lead compressor, and can be applied to systems as small as 1.5 tons. Turndown is application-specific; our engineers confirm the model and operating values for your equipment and refrigerant.
| Series | Application | Modulation |
|---|---|---|
| Small systems | Residential, from 1.5 tons | Application-specific |
| APR Control | Lead compressor | Upwards of 80%+, unit-dependent |
Full model tables and turndown values are confirmed per application.
Refrigerant Compatibility
Compatible with standard RTU and split systems, and new or old refrigerants (R-410A, R-454B, R-32). Legacy R-22 systems are supported as well. See the Refrigerants Hub for the transition picture.
Backed by a 1-year parts warranty and live engineering support.