Robertshaw ROUND ZONE DAMPERS - Manual

Robertshaw motorized round zone dampers are just
what you need for low-pressure zone control systems,
and they enhance airflow in any duct system. Our
dampers are designed for light commercial and
residential applications with static pressure systems
not exceeding 1.2” WG. All round zone dampers are
constructed of rolled galvanized steel with stiffening
ribs to maintain rigidity. A single steel offset blade is
attached to a 1-piece steel shaft connected with
nylon bearings for smooth operation. They are
powered by a single stall-type motor with 55 to 75
inch-ounces of torque.
Dampers can be wired with 2-wire or 3-wire
actuators. The 2-wire actuators are spring return with
a normally closed or normally open configuration. The
3-wire actuators are power open-power close in a
normally open configuration. The motor has a “lost
motion” braking system that prevents backlash and
shock to the motor gears, bearings and blade shaft
when the damper is driven open by the spring return.
PRODUCT DESCRIPTION
FEATURES AND BENEFITS
• Lightweight for easy installation
• Stiffening ribs maintain rigidity
• Nylon bushings provide smooth operation and
eliminate blade slippage
• Motor mount welded to shell for added sturdiness
• One piece solid steel shaft eliminates binding
• External minimum position adjust for easy accessibility
• External damper blade position indication
• Anti-backlash braking system prevents shock to system
• Single stall-type motor doesn't require switches
ROUND
ZONE DAMPERS