TrueZONE ARD, EARD, and ZD
Series Dampers
INSTALLATION INSTRUCTIONS
APPLICATION
ARD Series Damper
The ARD is a round damper with a 24 Vac, spring-Open return damper motor used to control circulating air in heating, cooling, and ventilating systems.
EARD Series Damper
The EARD is a round damper with a 24 Vac powered-open/ spring-closed motor. It is used for fresh air intake for Ventilation or for combustion makeup air.
ZD Series Damper
The ZD is a power close and spring open damper. It has a 24volt 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
•Taping Flange and non-interfering set screw
•High Temperature outer plastic for hot environments
•Redesigned all Metal Drive Train Gears
•Front facing display with LED Indication light for Open and Close.
•Adjustable damper position range stops
•Quiet operation.
ARD Features
•Adjustable close position range stops
•Shipped as power closed/spring return open damper.
•Available in 5 to 10” inch, 12, 14, 16, 18, and 20 inch diameter sizes.
•Male (crimped) and female (uncrimped) ends to connect to any rigid or flexible round duct.
•Rated to operate up to 1 in. wc
•Blade closes off tightly against gasket for minimal leakage.
•Fail-safe, normally open operation
•Simple, easy-to-wire, two-wire installation with a third wire option M4 for LED open only light
EARD Features
•Adjustable open position range stops
•Shipped as power open/spring return closed damper.
•Blade closes off tightly against gasket for minimal leakage.
•Galvanized steel
•Rated to operate up to 1 in. wc
•Simple, easy-to-wire, two-wire installation
•Male (crimped) and female (uncrimped) ends to connect to any rigid or flexible round duct.
ZD Features
•Adjustable closed position range stops
•Rated to operate up to 1 in. wc
•Solid construction using extruded aluminum frame and blades
•Parallel blade design for low leakage performance
•Simple, easy-to-wire, two-wire installation with a third wire option M4 for LED open light
•Fail-safe, normally open operation
•Ordering Instructions: Order ZD (dimension 1) x (dimension 2). (Motor is always mounted on dimension 2 side.) For example, ZD10x8TZ is a 10 in. x 8 in. damper with the motor on the 8 in. side; but a ZD8x10TZ is a 8 in. x 10 in. damper that has the motor on the 10 in. side.
•Damper can be installed in any orientation (mounting side can be on either the bottom or the side of the duct).
33-00040-01
TRUEZONE ARD, EARD, AND ZD SERIES DAMPERS
SPECIFICATIONS
IMPORTANT
The specifications given in this publication do not include normal manufacturing tolerances. Therefore, this unit may not exactly match the listed specifications. Also, this product is tested and calibrated under closely controlled conditions, and some minor differences in performance can be expected if those conditions are changed.
Motor Electrical Rating: 24 Vac, 60 Hz, 8VA.
Motor Electrical Connection: Push terminals. Solid (not stranded) wire is recommend.
Motor Nominal Angular Rotation: 90°.
Motor Torque: Minimum 71 in.-oz. (500 millinewton meters) output torque available when motor is energized and device is at the spring return initial start position.
Nominal Motor Timing at 77°F (25°C) Ambient:
Energized at rated load: 30 seconds. De-energized (spring return): 10 seconds.
Motor Ambient Temperature Rating: 40° to 140°F (5° to 60°C).
Leakage: Less than 1% at 1/2 in. wc.
Pressure Drop: Maximum at full open: 0.0329 in. wc at 800 ft/min.
4-41/64
(118)
4-1/16
(103)
Maximum Static Pressure: 1 in. wc for all models except 0.3 in. wc for ARD20.
Motor Shaft Rotation Direction: Clockwise, when energized and viewed from the base or shaft end.
Motor Mounting Means: Direct connection to damper shaft.
Motor Mounting Position: Multi-poise.
Motor Dimensions: See Fig. 1.
Construction
ARD Dampers
Frame: Galvanized steel spiral duct, crimped on downstream side.
ARD Sizes: 5 in., 6 in., 7 in., 8 in., 9 in., 10 in., 12 in., 14 in., 16 in., 18 in., and 20 in. diameters.
Gauge: ARD5-ARD12: 24 Gauge frame, and 22 Gauge Blade: ARD14-ARD20: 22 Gauge frame, and 20 Gauge Blade
EARD Dampers
Frame: Galvanized steel spiral duct
EARD Sizes: 5-, 6-. 7-, and 8-, inch diameter sizes
ZD Dampers
Frame: Solid construction using extruded aluminum frame and blades
ZD Sizes: Even sizes from 6in. x 6in. up to 36 in x 36 in. Damper dimensions: All ZD dampers are actually sized 5/ 32 in. smaller than the listed size to ensure correct fit.
4-31/32
(126)
3-61/64
(100)
M35186
Fig. 1. Motor and damper dimensions in in. (mm).
INSTALLATION OF ARD AND EARD DAMPERS
Before Installing this Product…
1.Read all instructions before installing this product. Failure to follow the instructions can damage the product or cause a hazardous condition.
2.Check the ratings given in the instructions and on the product to make sure the product is suitable for your application.
3.Installer must be a trained, experienced service technician.
4.Install the product in an area that is easily accessible for checkout and service.
5.After completing installation, use these instructions to check out the product operation.
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Installing the Round (ARD and
EARD) Dampers
1.Insert the crimped end of the ARD or EARD into the uncrimped end of the rigid round duct and secure with sheet metal screws (not provided). When using flexible duct, slip the duct over the end of the ARD or EARD and secure it with duct straps (not provided).
2.When installing the damper in a horizontal application, make sure the motor actuator is located on the side or top of the damper. Do not locate the motor on the bottom of the damper. The damper can be mounted in a vertical duct.
3.Adjust Range stop position to desired closed positions. ARD and ZD Dampers are completely closed in position 0. EARD Dampers are completely open in position 0.
RANGE STOP
LOCATIONS
M35187
Fig. 2. TrueZONE Actuator range stop positions.
Wiring Multiple Dampers
When the same zone controls two or more dampers, wire the dampers in parallel to terminals M1 and M6 on the zone control panel.
INSTALLATION OF ZD DAMPER
When Installing this Product…
1.Read these instructions carefully. Failure to follow these instructions can damage the product or cause a hazardous condition.
2.Check the ratings given in the instructions and on the product to make sure the product is suitable for your application.
3.Installer must be a trained, experienced service technician.
4.All wiring must comply with local electrical codes, ordinances, and regulations.
5.After completing installation, use these instructions to check out the product operation.
TRUEZONE ARD, EARD, AND ZD SERIES DAMPERS
Planning the Installation
Selecting a Location
Select a location for the zone dampers that is at least three feet from the HVAC unit plenum in the air duct takeoff to the respective zone and is easily accessible for checkout and maintenance.
The ZD comes complete and ready for installation. The motor and linkage are factory-assembled to the damper. The damper is assembled for installation and wiring to the control panel.
Selecting Damper Size
To ensure correct operation, be sure to select the correct zone damper size for the air duct:
IMPORTANT
Be aware that damper sizes are built 5/32 in. smaller than the listed dimensional sizes.
•If the damper is forced into an undersized air duct, the excess pressure can jam the damper blades and cause improper operation.
•When a small percentage of continuous flow is desired in a zone, even when the damper blades are closed, adjust motor closed position to be slightly open to maintain desired air flow.
Selecting Location with Humidifier Installed
IMPORTANT
Excessive lime or mineral deposits can accumulate on damper blades and cause improper operation when spray or atomizing type humidifiers are installed in the furnace plenum or air supply duct with the zone dampers.
•Spray or atomizer type humidifiers that are installed in the furnace plenum or air supply duct are not recommended.
•Evaporative type humidifiers are recommended.
Installing the Damper
IMPORTANT
—Install dampers into a squared air duct.
—Do not weld dampers to the air ducts.
—Do not force dampers into undersized air ducts. Excess pressure can damage damper blades.
—Be sure high limit setting is less than 200° F (93°C).
—Higher settings can damage the electric actuator.
1.Be sure the ZD is correctly sized to the air duct (see Selecting Damper Size section).
2.Select a ZD location that is three feet from the furnace plenum.
3.Cut a 4-in. (102 mm) opening in the accessible side of the air duct at the location selected; ensure the opening of the air duct is cut fully from seam to seam.
4.Secure the ZD mounting plate to the air duct with the self-tapping sheet metal screws provided.
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