The ZD is a power close and spring open damper. It has a 24-volt motor used to control circulating air in HVAC systems and used when a normally-open damper is required. The ZD is typically used with the TrueZONE and other electronic zoning systems.
 
  Features
  
  - Mechanical visual position indicator for damper status.
- Solid construction using extruded aluminum frame and blades.
- Parallel blade design for low leakage performance.
- Simple, easy-to-wire, two-wire installation.
- Reliable, strong, 24-volt spring-return motor.
- Fail-safe, normally open operation.
- Damper can be installed in any orientation (mounting side can be on either the bottom or the side of the duct).
Product Specifications
 Application:  Parallel Blade Damper
Used With:  Honeywell zoning systems
Voltage:  24V
Size(in.):  14 in. x 8 in.
Blade Action:  Parallel
Shape:  Rectangular
Motor or Actuator Mounting:  Side
Motor:  Power closed, Spring open
Motor Timing:  30 seconds power open/10 seconds spring return
Wires to Motor:  Terminals: M1-Power; M6 Common; M4(optional)-LED indication
Other Motor Information:  Simplified range stops