ZoneFirst ZDSM-32X20 Damper

The ZoneFirst ZDSM-32X20 is a heavy-duty rectangular zone damper designed for high-performance airflow management in residential and commercial HVAC systems. Featuring parallel blade construction, this 32" wide x 20" high unit utilizes a 24Vac synchronous motor for reliable power-open and power-closed operation. Engineered with an extruded aluminum frame, the ZDSM-32X20 provides superior structural integrity and corrosion resistance compared to standard galvanized steel alternatives. The motor is side-mounted on the 20" dimension, optimizing the horizontal profile for tight plenum installations. As the official direct replacement for ZDM-32X20, it integrates seamlessly with existing ZoneFirst control panels using a standard 3-wire hookup. This HVAC zone damper is rated for static pressures up to 2.0" W.C., ensuring quiet, efficient modulation in 3-wire zone control applications. For contractors managing airflow balance, this unit offers consistent 24V motorized damper performance with self-lubricating bushings that reduce mechanical drag and operational noise.

• Direct Retrofit Compatibility: Perfectly replaces legacy ZDM-32X20 models without requiring ductwork modifications.
• Precision Airflow Control: Parallel blades provide a tighter seal and more linear airflow modulation for accurate temperature zoning.
• Enhanced Durability: Extruded aluminum construction and synchronous 24Vac motor are built to handle the cycling demands of commercial-grade systems.
• Simplified Wiring: Standard 3-wire terminals (PO/PC) ensure compatibility with ZoneFirst zoning systems and most universal control boards.
• Efficient Performance: Tested to over 250,000 cycles, providing long-term reliability in high-cycle bypass and zone applications.

Is the ZDSM-32X20 a direct swap for the older ZDM-32X20?
Yes, the ZDSM series is the engineered successor to the ZDM line, maintaining the same mounting footprint and electrical requirements.

Can I use this damper for a bypass application?
Absolutely. When paired with a static pressure sensor or control (SPS/SPC), these dampers modulate effectively to manage excess bypass air in multi-zone setups.

Does the motor require a specific mounting orientation?
The motor is mounted on the 20" side. For internal linkage longevity, it is recommended to install the damper with the motor shaft positioned horizontally.

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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.