Cleveland Controls DDP-109-186 Pressure Switch

The Cleveland Controls DDP-109-186 is a professional-grade dual pressure switch engineered for high-precision air pressure sensing in HVAC and energy management systems. This robust unit features two independently adjustable SPDT snap-acting switches mounted on a shared foot bracket, allowing technicians to establish a precise deadband for complex control circuits. Each switch assembly is housed in a plated metallic enclosure with a silicone diaphragm and a dedicated calibration spring, ensuring reliable operation across a set point range of 0.05" to 2.0" w.c. Designed for versatility, the DDP-109 monitors differential pressure, positive pressure, or vacuum pressures, making it an essential component for proving airflow in commercial dampers and air handlers. The unit includes three 1/4" OD compression fittings—one common high-pressure inlet and two independent low-pressure inlets—facilitating streamlined plumbing in multi-point sensing applications. With a pilot duty rating of 300 VA at 115-277 Vac, this air pressure sensing switch provides the durability required for demanding industrial environments.

• Dual Independent Set Points: Two separately operated switches allow for independent high and low actuation points on a single mounting bracket.
• Precise Field Adjustability: Calibrate each element from 0.05" to 2.0" w.c. using intuitive adjustment screws for tailored system performance.
• Industrial-Grade Build: Rugged zinc-plated steel housing and NEMA 1 enclosure protect internal snap-acting switches from environmental debris.
• Flexible Connectivity: Integrated 1/4" OD compression ferrule and nut fittings accept copper, aluminum, or plastic tubing for universal compatibility.
• Reliable Operation: Tested for a minimum of 100,000 cycles at maximum rated electrical loads, ensuring long-term stability in critical HVAC applications.

How do I plumb the DDP-109 for differential pressure sensing?
Connect your high-pressure source to the common "H" port located on the foot bracket. Connect the low-pressure sources to the "L" ports on Element A and Element B respectively. This allows each switch to independently monitor the pressure drop across two different points relative to a single high-pressure reference.

What is the proper mounting orientation for this switch?
For maximum accuracy and to reach the lowest specified set point, always mount the DDP-109-186 with the diaphragm in a vertical plane. Avoid mounting locations prone to high vibration or orientations where sample line connections face upwards, as this can lead to moisture accumulation in the housing.

Can this switch be used to monitor negative pressure?
Yes. To monitor a vacuum or negative pressure source, connect the sample line to the "L" port of the desired element while leaving the "H" port open to the atmosphere. For two separate negative samples, connect the higher negative (closer to zero) to "H" and the lower negative (more vacuum) to "L".

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.