Capacity Optimization
Your DX system was sized for peak conditions. Those conditions exist 3% of the time. RCCD handles the other 97%.
The RCCD Capacity Control Valve continuously modulates DX cooling output from 0 to 60% — without replacing existing equipment. The result is longer run times, better humidity control, less wear, and real comfort improvement.
3%
of time at peak design load
0–60%
continuous modulation range
2–4 hrs
typical installation time
The Problem
Why Most DX Systems Struggle
HVAC equipment is sized for peak design load — the hottest day of the year, at full occupancy. That condition rarely happens. Most of the time the building load is a fraction of design peak. Traditional DX systems respond with one option: cycle on at full capacity, then off. Repeat.
Short Cycling
Frequent on/off starts stress compressors, shorten equipment life, and spike energy use at startup.
Poor Humidity Control
Systems don't run long enough to adequately dehumidify. Occupants feel clammy even when the thermostat reads correctly.
Comfort Complaints
Temperature swings cause hot and cold spots throughout the day.
Coil Freeze Risk
Under low-load conditions, evaporator coils can drop below freezing, causing ice buildup and system faults.
Compressor Wear
Each startup puts significant stress on the compressor. Systems cycling 10–15 times per hour age prematurely.
How It Works
Continuous Capacity Modulation — No Controls Required
RCCD installs in the refrigerant circuit and continuously senses load conditions. As building load drops, RCCD modulates capacity downward — allowing the system to keep running at reduced output rather than cycling off.
No complex controls. No variable frequency drives. No replacement compressors. RCCD works with the existing system and adjusts in real time.
No controls wiring required
Works with existing compressors
Real-time load sensing
Installs in the refrigerant circuit
Key Benefits
What Makes RCCD Different
0–60% Modulation Range
A system with RCCD behaves more like a variable-capacity unit. It runs longer at lower power, matching actual building load instead of slamming between 100% and off.
Senses Load Automatically
RCCD reads evaporator conditions and keeps evaporator temperature stable as room conditions change. No external sensors or programming needed.
Patented Bottom Exhaust
Bottom exhaust design supports uniform compressor oil return and eliminates the risk of liquid refrigerant or oil trapping — a common failure point in competing designs.
Built-in Sensing Bulbs
Permanently mounted sensing bulbs eliminate the need for external attachments that can shift, leak, or lose calibration over time.
Installation
Designed for Practical, Real-World Installs
Flexible Mounting
Mount vertically, horizontally, or anywhere in between.
On-Body Diagram
Connection points are labeled directly on the valve body.
Blygold Coating
Coated for corrosion and UV resistance in coastal, humid, and demanding environments.
Energy Equalization
Injection mixing nozzle and thermodynamic catalyst for stable operation with minimal back pressure.
Applications
Where RCCD Performs Best
RCCD is most effective in buildings where load varies significantly throughout the day — which is most buildings. If your system short-cycles, has humidity complaints, or runs oversized equipment, RCCD is worth evaluating.
Schools, libraries, offices
Adapts to changing occupancy and usage patterns throughout the day
Technology and equipment rooms
Responds to fluctuating internal heat loads without over-cooling
Facilities with humidity complaints
Longer run times at reduced capacity dramatically improve moisture removal
Zoned systems
Adjusts capacity as zones open and close
Chillers at low load
Reduces evaporator freeze risk during shoulder-season conditions
Multi-stage systems
Installed on the first stage, RCCD can double or triple the effective modulation range
Oversized RTUs
Ideal for buildings where loads changed due to renovations or repurposed spaces
High make-up air systems
Reduces short cycling caused by wide swings in outdoor air conditions
FAQ
Common Questions
Get in Touch
Tell us about your project. We'll find the right solution.
TPI handles sizing and local technical support for all RCCD products. Submit your system details and we'll respond with sizing recommendations and pricing.
Product Resources
RCCD Valve — Literature & Resources
Product literature, videos, brochures, and technical documents for the RCCD Capacity Control Valve.
Capacity Optimization
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