Honeywell MARD Catalog Page
Zone Control Dampers
Modulating Automatic Round Dampers (MARD)
The Modulating Automatic Round Damper is a round damper with
a 24-Vac, floating-control type modulating motor for bypass and
zone damper control.
• Uses 90-second open to closed motor
• Can be used as a zone damper
• ML6161 is replacement motor
• Available in 6, 8, 10, 12, 14, 16, and 18 in. diameter sizes
• Used with Static Pressure Control (SPC) for bypass applications
Application: Motorized Bypass or Zone Damper
Voltag e: 24V
Motor Type: Floating
Wires to Motor: 3
Motor Timing: 90 seconds
Product Number Shape Size (in.) Motor Mount Description
MARD6/U Round 6 in. Diameter Top; Side Power Open, Power Close Damper
MARD8/U Round 8 in. Diameter Top; Side Power Open, Power Close Damper
MARD10/U Round 10 in. Diameter Top; Side Power Open, Power Close Damper
MARD12/U Round 12 in. Diameter Top; Side Power Open, Power Close Damper
MARD14/U Round 14 in. Diameter Top; Side Power Open, Power Close Damper
MARD16/U Round 16 in. Diameter Top; Side Power Open, Power Close Damper
MARD18/U Round 18 in. Diameter Top; Side Power Open, Power Close Damper
Retrofit Round Damper (RRD)
The RRD is a round damper that is easily inserted into rigid round
ducts for retrofit zoning in forced air heating and cooling systems.
It is available in four sizes for use in 5 in., 6 in., 7 in., and 8 in.
ducts. The damper is used with Honeywell HZ221, HZ311, HZ322,
HZ432 and similar zone control systems. The power open, power
closed actuator draws 2 VA allowing multiple dampers per zone,
but delivers high torque for reliable operation.
• Easy slide-in installation
• 2 VA allows for many dampers on one zone
• Available in 4 sizes to fit most rigid round branch ducts
• Quiet, long life motor automatically shuts itself off in
full open and closed positions
• Gaskets around blade and under motor housing for
low internal leakage and very low external leakage
• Range stops with easy adjustment from top of motor
• Easy to see and reliable mechanical blade position indicator
• Easy to hook up with conventional thermostat wire
• Simple manual blade positioning with push button gear release
Application: Zone Damper
Voltag e: 24V
Wires to Motor: 3
Motor Timing: 90 seconds
Other Motor Information: Range stops
Product Number Shape Size (in.) Motor Mount Motor Type Description
RRD5/U Round 5 in. Diameter Direct connection to damper shaft Power open/Power close Retrofit Round Damper
RRD6/U Round 6 in. Diameter Direct connection to damper shaft Power open/Power close Retrofit Round Damper
RRD7/U Round 7 in. Diameter Direct connection to damper shaft Power open/Power close Retrofit Round Damper
RRD8/U Round 8 in. Diameter Direct connection to damper shaft Power open/Power close Retrofit Round Damper
46 customer.honeywell.com 70-6910
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