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Robertshaw ROUND ZONE DAMPERS User Manual

Round, Zone dampers, Product description features and benefits

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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