Zonefirst ZDS User manual

MINIMUM POSITION SETTING CHECKOUT
The ZDs have a minimum
position setting that allows the
damper to remain open to a pre-
set position instead of closing off
fully. This minimum position
provides for a small amount of air
to be by-passed through the
damper to lessen the need for a
separate by-pass damper and
provide continual air circulation.
To set the minimum position, set when there is no power to the
damper and it is in the open position. Loosen the long minimum
position set screw and move to a desired setting shown on the
minimum position label and re-tighten. When the damper is
powered closed the minimum position screw will stop the damper
at the position set.
NOTE: This label and screw does not indicate the position of
the damper. It is only used to set the minimum position.
The ZD damper is a very simple damper to checkout. The two (2)
wire spring return design simply requires a check for voltage at the
motor when the damper is to be CLOSED. There must be 24 Volts
AC, at the motor when the controller or switch provides power to
the motor. When the is no power to the motor the damper will
spring return back to its normally open position.
REPLACEMENT MOTOR
To replace the motor, loosen the locking set screw on the inside collar
ring of the motor that holds the motor to the damper blade shaft,
remove the moved and replace with the new motor. And re- tighten
the set screw.
6 Aspen Drive --
Randolph, New Jersey 07869-1103
Telephone [phone] FAX [phone]
www.zonefirst.com i n fo @z on e fi rs t. com
© 2017 ZONEFIRST® Form 2043 - 0710

POWER TO POWER
CLOSED OPEN
INSTALLATION
WHEN INSTALLING THIS PRODUCT…
Read these instructions carefully. Failure to follow the instructions
could damage the product or cause a hazardous condition. Ensure that
the installer is a trained, experienced service technician. After
completing installation, use these instructions to check product
operation.
LOCATION
The Zone Dampers are installed typically near the furnace/air handler
plenum and in the air duct takeoff to the zone. Always make sure the
dampers are accessible for wiring, checkout, duct cleaning and
replacement of damper or motor if ever needed.
DAMPER SIZE
To ensure proper operation, the ZD must be properly sized for the air
duct. To ensure proper fit, damper sizes are built slightly smaller. ¼”
less than the listed dimensions. If the damper is forced into an
undersized air duct, the excess pressure jams the damper blades and
causes improper operation.
HUMIDIFICATION
Do not install dampers in heating systems where spray or atomizing
type humidifiers are installed in the furnace plenum or air supply duct.
Excessive lime or mineral deposits accumulate on damper blades
and cause improper operation.
For humidification, use evaporative type humidifiers or return air type
humidifiers.
INSTALLATION CONSIDERATIONS
Install Zone Dampers (ZDS) or (ZDB) into a squared air duct. Frame
misalignment may jam the damper blades. Do not weld dampers to air
ducts.
INSTALLING A ZONE DAMPER
Ensure the ZD is correctly sized to the air duct and select a ZD location
near the furnace plenum.
1. Cut a 4-inch (102-millimeter) opening in one side (shorter dimension)
of the air duct at the location selected. Ensure the opening is cut fully to
the top and bottom air duct seams.
2. Slide the ZDS into the cut opening of the air duct. Ensure the electric
actuator is mounted toward the top of the air duct.
3. Secure the ZDS mounting plate to the air duct with the sheet metal
zip screws provided.
CAUTION
Locate and install dampers in an easily accessible location for Service
and Checkout.
Never force dampers into undersized air ducts. Excess pressure will jam
damper blades.
Ensure high limit setting is 200 q F (93 q C) or lower. Higher settings can
damage electric actuator.
WIRING
BEFORE WIRING –MAKE SURE ALL POWER IS DISCONNECTED
TO PREVENT SHOCK AND EQUIPMENT DAMAGE.
ALL WIRING MUST CONFORM TO NEC STANDARDS AND ALL
APPLICABLE LOCAL CODES.
The ZD damper is the simplest damper in the industry to wire. The
ZD requires only two (2) wires for it 24 Volt AC, power-closed, spring
return open operation.
The two wires from the motor wire to a normally open zone control
panel to terminals M1 (Common) and M6 (Closed). See Wiring
Diagram 1.
For other type of controls the two leads go direct to a 24 Volt power
source and one of the motor leads is interrupted by a switch. See
Wiring Diagram 2.
One 24VAC, 40VA Transformer can power up to five (5) damper
motors.
To slave more than one motor together wire the motors in parallel. A
total of five (5) motors should be on one 40VA transformer. When
require more than five motors and isolation relay and additional
transformers may be required.
WIRING DIAGRAM 1
M6/CLOSE
M4/OPEN
M1/COMMON
When replacing older 5 wire
dampers, wire as shown and
jumper M2-M5 terminals on control
panel.
WIRING DIAGRAM 2
Switch
24VAC
CONVERTING ZD from Power Closed to Power Open
Tools required - flat tip (3/16x7") screwdriver (magnetized or adhesive tape)
1. Set the damper on a flat surface with the motor on the top of damper.
2. Note the position of the damper linkage (crank arms/drawbar) on the opposite
side of motor as shown in Power Closed drawing at right.
3. Loosen the slotted set screw on the coupling located between the faceplate
and damper frame. This allows the motor to be removed.
4. Disengage (gently pry up on snap fit crank arm base) and remove the linkage
assy connecting the blades.
5. Rotate damper blades counter clockwise to closed position
6. Reattach (snap fit crank arms) linkage assy, crank arms are now aligned at
apx 7 o'clock position as shown in Power Open drawing at right.
7. Reattach the motor and tighten the set screw. Apply power to ensure the damper
powers open and spring returns closed.
Crank arms shown Crank arms shown
in Open Position in Closed Position