Cleveland Controls DDP-109-204 Switch

The Cleveland Controls DDP-109-204 is a robust dual pressure sensing switch designed for critical HVAC and energy management applications. This general-purpose proving switch features two independently-adjustable SPDT snap-acting switches mounted on a robust common foot bracket, allowing technicians to establish a precise deadband for complex control circuits. With an adjustment range from 0.05" to 2.0" w.c., this differential pressure switch is ideal for monitoring airflow, filter status, and fan proving in large-scale air handling units. Each sensing element utilizes a silicone diaphragm and a plated housing to ensure long-term reliability in varying environmental conditions. The DDP-109-204 facilitates dual switching action from a single high-pressure source, significantly reducing installation time and manifold complexity for HVAC contractors. For optimal sensitivity, the unit should be surface mounted with the diaphragms in a vertical plane at least 1.5 duct diameters downstream from the air source.

• Dual Independent Sensors: Provides two separately-operated SPDT switches for high and low actuation points from a single manifold.
• Field Adjustable Range: Precision calibration screws allow for a set point range of 0.05" ± .02" w.c. to 2.0" w.c. across both elements.
• Universal Compatibility: Designed for 1/4" OD metallic tubing with integral compression ferrule and nut fittings.
• Industrial Durability: NEMA 1 rated zinc-plated steel enclosure protects the 6-32 screw terminals and internal mechanisms.
• Versatile Application: Suitable for differential pressure monitoring, clogged filter detection, and combustion air proving.

How do I adjust the set points on this dual pressure switch?
Each element is calibrated by turning the adjustment screw. From the stop, rotating clockwise engages the spring; each subsequent full turn adjusts the set point by approximately 0.2" w.c. A digital manometer is recommended for final verification.

Can this switch be used for both positive and negative pressure?
Yes. The DDP-109-204 features a common high-pressure port (H) and two individual low-pressure ports (L). It can be configured for positive pressure, vacuum (negative) pressure, or differential pressure between two different sources.

What is the maximum electrical load for the SPDT contacts?
The snap switches are rated for 300 VA pilot duty at 115 to 277 Vac, with a 15A resistive rating at 277 Vac, making them compatible with standard industrial control circuits.

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.