N/A Presented with a goal to create a complete energy efficient compressed air treatment system, our engineers conceived and designed the RSD Series. This one package is able to provide you with maximum energy efficiency, clean dry oil-free air, and a single set of connections for easy installation.

RSD Series Digital Scroll Refrigerated Air Dryers combine proven elements to your advantage for:

N/A ...Compression Made Simple

There are less moving parts in the entire Digital Scroll refrigeration circuit. The motor shaft/orbiting lower scroll assembly, the upper scroll, and a solenoid valve tested to 40 million cycles that loads and unloads the hermetically sealed refrigerant circuit. The RSD Series’ patented Digital Scroll compression technology benefits you with:

Radial Compliance… the ability to automatically adjust the side-to-side movement of the scroll set to accommodate the presence and removal of non-compressible elements such as liquids or solids in the event of abnormal conditions

Axial Compliance… enables the digital load control solenoid to move the upper scroll up-and-down 4/1000 of an inch, to load and unload the refrigeration compressor

Less Parts… means greater reliability. Piston compression requires 9 parts per cylinder. Digital Scroll compression is accomplished with only two parts; the upper and lower scroll set.

N/A …Simple, Original Cooling

The beauty of the Digital Scroll refrigeration circuit is in its simplicity. Environmentally friendly low-pressure R-404a refrigerant gas is pressurized in the Digital Scroll Compressor (1). Once compressed into a high-pressure gas, it then flows through the condenser (2) and changes to a cold 35°F liquid. The thermal expansion valve (3) precisely meters the cold liquid refrigerant into the evaporator (4) where the work is done. Hot, saturated compressed air enters the evaporator at the end opposite the incoming liquid refrigerant. The compressed air is chilled as they cross paths. Water is condensed out of the cold exiting air and is efficiently removed in the Separator/Filter (5). When ordered, the Grade E cold coalescing filter (6) removes oil droplets and aerosols to 0.008 ppm. The warm refrigerant is now a gas and returns to the Digital Scroll Compressor to continue the process.

While the compressor continues to run, the Energy Saving Controller (7) automatically energizes and de-energizes the solenoid valve (8) to load and unload the compressor. This precisely controls the flow of the refrigeration circuit to exactly match your load conditions. We maintain a stable 38° F pressure dew point, and provide you with maximum energy savings.

N/A ...State-of-the-Art Instrumentation

The RSD Series’ Energy Saving Controller (ESC) combines advanced electronics with globally recognized symbolism for simple at-a-glance operational security that includes an RS-232 communications interface port.

ESC Controls benefit you with:

N/A Digital Scroll Refrigeration Compressor

N/A Dew Point Stability & Energy Efficiency…what a concept!

For decades, compressed air drying technologies have forced you to choose between pressure dew point stability and energy efficiency. Why? Because until the RSD Series was invented, it was virtually impossible to deliver both at the same time! Dew point stability relies on prompt responses of cooling-energy to the changes in heat load generated by swings in ambient conditions and compressed air flow. Energy savings result from interpreting those very same changes and then controlling the response of the refrigeration compressor.

Advanced Digital Scroll cooling technology holds your dew point steady and starts saving you money the minute you turn it on. Digital Scroll compression uses environmentally friendly R-404a refrigerant and consumes less energy. You benefit with a steady 38°F pressure dew point that matches your plant air demand to the second and your drying costs to the penny.

N/A 1. Digital Scroll
Digital Scroll technology holds a steady dew point while it examines the actual heat load to know precisely when to start and stop the flow of the refrigerant. Maintaining constant motor speed and winding temperature ensures maximum motor lubrication and service life. Revolutionary design matches energy consumption to work load to achieve up to 91% energy savings while in operation. Scheduler mode totally eliminates all intermittent energy consumption during non-working hours without compromising dew point stability when work begins anew.

2. Hot Gas Bypass Valves (HGBV)
“Non-cycling” systems use a HGBV and run continuously to control the flow of the refrigerant and maintain a stable dew point. Energy consumption remains fairly constant regardless of air demands. Ideal for a stable pressure dew point at full load conditions.

3. Thermal Mass Storage
Cycling systems normally use a volume of a chemical called Proplylene Glycol or Sand to store cooling energy so the refrigeration compressor can be stopped and started. Energy is saved while the compressor is off. Start/stop temperature differential set points may produce an unsteady dew point. Dew point spikes can allow up to 120% more water vapor to remain than when maintaining a steady 38°F pressure dew point.

4. Variable Frequency/Speed Drive (VFD or VSD)
Motor speed is controlled by electronics that manufacture variable AC power. Energy savings maximizes at 50% of speed. Limiting motor speed reductions to 50% minimizes upper motor bearing lubrication losses that increase as compressor speed is reduced. HGBV is included to control dew point when operating below 50% of rated capacity.

N/A ...Energy Savings

System Pressure Savings
RSD Series Dryers start saving you money before you even turn them on. Your first line of savings results from being able to reduce your system pressure. Pressure savings result from our exclusive heat exchanger design that doesn’t need a Prefilter. You save by not having to purchase and install a prefilter or, pay for the costly pressure drop associated with it. This feature alone saves you 2-5% of the rated brake horsepower of your air compressor.

Productivity Savings
Manufacturing productivity averages 81% of available time per shift. The remaining 19% of working hours is comprised of coffee breaks, lunch breaks and shift changes. Air demands may drop sharply due to curtailed usage during those periods. The RSD Series’ unrivaled efficiency will match those demand changes and shift the savings to your bottom line.

It is common to have large surges in plant air demand that challenge system capacity for a brief period. This gives you the illusion that you are running your compressors at full capacity. However, many air system audits find continuous changes in demand with 75% of capacity representing a typical average load for first shift operation. Lighter loads on second shift may reduce air demand to less than one-half of capacity, and even less on third shift. Rely on the RSD Series to automatically maximize your bottom line energy savings.