ZD Series Dampers Product Data

ZD SERIES DAMPERS
3 68-0247-2
INSTALLATION
When Installing this Product...
1. Read these instructions carefully. Failure to follow these
instructions can damage the product or cause a hazard-
ous 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 techni-
cian.
4. All wiring must comply with local electrical codes, ordi-
nances, and regulations.
5. After completing installation, use these instructions to
check out the product operation.
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.
WIRING
CAUTION
Personal Electrical Shock Hazard.
Can cause electrical shock or equipment damage.
Disconnect power before beginning installation.
The ZD has a 24 Vac, 50/60 cycle, .32A motor. The ZD is
wired to terminals M1 and M6 for power closed/spring return
open. See Fig. 2.The ZD is a spring return damper that
requires 24V to the two motor leads to power the damper
closed. When power is removed from the motor, the damper
springs back to its normally-open position. When used with
Honeywell Networked Zoning, use closed and com terminals.
Fig. 2. Power closed spring return open ZD wiring.
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.
C
LOSED M6
M14851A
OPEN M4
COM M1
NOTE:
WHEN INSTALLING ON OLDER MASTERTROL
TM
BOARDS SUCH AS THE MARK V, JUMPER
M2-M5 ON THE PANEL.