Cleveland Controls DDP-109-187 Switch

The Cleveland Controls DDP-109-187 is a heavy-duty dual air pressure sensing switch designed for critical HVAC and energy management proving circuits. This unit features two independently adjustable SPDT switches mounted on a common foot bracket, allowing technicians to establish a precise deadband for complex control sequences. Each switch assembly operates separately, measuring differential pressures from 0.05" wc to 2.0" wc. This configuration is essential for monitoring two distinct pressure sources or sensing the differential for actuation at two independent set points, such as high and low fire verification in multi-stage systems.

Built for the field, the DDP-109-187 utilizes a silicone diaphragm and snap-acting switches rated for 300 VA pilot duty at 115-277 VAC. The plated housings include enclosure covers that protect live terminal screws and set point adjustments, with dual 1/2-inch conduit connections for streamlined wiring. For reliable operation, the unit must be mounted with the diaphragm in a vertical plane. The sample line connections use 1/4" OD metallic tubing with integral compression ferrules, ensuring a leak-proof seal in high-vibration environments.

• Independent Dual Set Points: Allows for custom high/low actuation points and adjustable deadband control.
• Robust Enclosure: Features protective covers for both switch assemblies to prevent accidental contact with live terminals.
• Versatile Media Compatibility: High-performance silicone diaphragm designed for monitoring inert dry air across a wide temperature range.
• Standardized Connections: Utilizes 1/4" compression fittings and 1/2" conduit openings for rapid field installation.

How do I adjust the actuation points on the DDP-109-187?
Each of the two switches has its own set point adjusting screw located under the enclosure cover. Turning the screw allows for field calibration within the 0.05" to 2.0" wc range.

What is the proper mounting orientation for this pressure switch?
To achieve the specified set point accuracy, the unit must be mounted with the diaphragm in the vertical plane. Avoid mounting with the sample line connections facing upward to prevent moisture or debris accumulation.

Can this switch be used for both positive and negative pressure applications?
Yes. By utilizing the common high-pressure (H) inlet and the dual independent low-pressure (L) inlets, you can configure the unit for positive, negative, or true differential pressure sensing.

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.