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The modulating round damper, model RDM, is a 24 VAC, power open, power closed modulating damper. The damper is constructed of 22 or 24 ga galvanized steel formed as a rigid spiral pipe and has a circular blade that closes tightly against a neoprene gasket seal. The RDM can be used for zone control, fresh air intake, ventilation or as the motorized damper for by-pass air when controlled by the static pressure switch (SPS) or static pressure control (SPC). It is also designed to also handle high-velocity air-conditioning systems up to 2 in WC.
Zonefirst® Zone Damper, Model: RDM, Circular Blade, Screw Terminal Electrical Connection, 5 to 95% RH Non-Condensing Humidity Rating, 9 s Nominal Powered Timing Range, 250 in-oz Torque, Steel, Galvanized, Inline Mounting, Power Open, Power Closed Motor, Motor Specifications: 24 VAC at 50/60 Hz, 4 VA, 0.17 A, Round Shape, 2 in-WC, 0 to 150 deg F Operating, -20 to 175 deg F Storage, 11-3/4 in Length
| Model | : | RDM |
| Blade Type | : | Circular |
| Electrical Connection | : | Screw Terminal |
| Humidity Rating | : | 5 to 95% RH Non-Condensing |
| Timing Range | : | 9 s Nominal Powered |
| Torque Rating | : | 250 in-oz |
| Material | : | Steel |
| Finish | : | Galvanized |
| Mounting Type | : | Inline |
| Motor Type | : | Power Open, Power Closed |
| Motor Specifications | : | 24 VAC at 50/60 Hz, 4 VA, 0.17 A |
| Shape | : | Round |
| Pressure Rating | : | 2 in-WC |
| Temperature Rating | : | 0 to 150 deg F Operating, -20 to 175 deg F Storage |
| Length | : | 11-3/4 in |
- The simple three wire motor has two light emitting diodes (LEDs) to indicate the damper position
- The MDM also has adjustable minimum position stop located under the motor cover
- The MDM has been factory tested to over 250000 cycles
- The MDM is a reversible motor that powers the damper both open and closed, it also has an adjustable stop for a minimum damper position setting
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