Cleveland Controls DDP-109-202 Switch

The Cleveland Controls DDP-109-202 Dual Pressure Sensing Switch is an essential component for high-accuracy HVAC air pressure monitoring and energy management systems. This general purpose proving switch features two independently adjustable SPDT snap-acting switches mounted on a common foot bracket, allowing for a versatile adjustable deadband in complex control circuits. With a set point range of 0.05" wc to 2.0" wc, the DDP-109-202 is engineered to sense the differential between two pressure sources, facilitating precise dual-action switching for fan status proofing and filter monitoring.

Built for the rigors of mechanical rooms, the DDP-109-202 utilizes a high-quality silicone diaphragm and field-adjustable calibration springs within plated housings. The unit includes an integrated enclosure cover to protect the 6-32 screw terminals and adjustment screws, and it is designed for vertical mounting to maintain calibrated set points. Technicians can rely on the 1/4" OD compression fittings for secure tubing connections, ensuring reliable differential pressure sensing in both commercial and industrial air handling applications.

Key Benefits

• Dual Independent Set Points: Control two separate circuits or establish a custom deadband between 0.05" and 2.0" wc.
• Versatile Media Compatibility: Optimized for use with air and combustion products in diverse HVACR environments.
• Rugged Protection: Features a NEMA 1 style enclosure cover that accepts 1/2" conduit for safe electrical termination.
• Proven Reliability: Constructed with zinc-plated steel and a flexible silicone diaphragm for long-term cycle life.
• Standardized Installation: Integral mounting bracket with two 3/16" diameter holes spaced 7" apart for easy surface mounting.

Common Questions

Can this switch be used to monitor two separate pressure sources?
Yes, the DDP-109-202 features two separate low-pressure sample connections and a common high-pressure port, allowing it to trigger independent SPDT switch actions based on differential sets.

What is the maximum electrical load for the contacts?
The DDP-109-202 is rated for 300 VA pilot duty at 115 to 277 VAC or a 15A non-inductive load at 277 VAC (60 Hz).

Does the mounting orientation matter for the set point accuracy?
To achieve the lowest specified set point (0.05" wc), the switch must be mounted with the diaphragm in the vertical plane. Mounting with the connections facing up is not recommended.

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.