WattMaster WM-WCC3-TGD-01B - Manual (Page 813)

Controller Installation & Wiring
General
Correct wiring of the VAV/Zone Controller is the most important factor
in the overall success of the controller installation process. The VAV/
Zone Controller wiring has been simplifi ed by the use of modular con-
nectors and prefabricated modular cables.
Controller Mounting
If you purchased the Round Zone Damper or Rectangular Zone Damper
Kits from WattMaster, the controller and actuator are factory mounted
and wired in the damper control enclosure. If your VAV/Zone Control-
lers are pressure independent, an airfl ow probe and pressure sensor will
also be factory mounted and wired.
Most terminal unit manufacturers will offer the option of factory mount-
ing the WCC III controls in their terminal units for an additional charge.
An installation worksheet and instructions are available for the VAV/
Zone Controller actuator package which can be shipped with the VAV/
Zone control(s) to the terminal unit manufacturer to simplify factory
mounting and wiring of the controller.
When the VAV/Zone Controller Actuator Package is to be fi eld mounted,
it is important to mount it in a location that is free from extreme high
or low temperatures, moisture, dust, and dirt.
1. Leave the enclosure cover on the VAV/Zone Controller Actuator
Package circuit board during installation to protect the circuit
board from damage. The damper actuator is factory mounted
for what we refer to as right-hand terminal unit mounting. This
assumes you are standing downstream of the terminal unit with
air hitting you in the face. The side of the unit towards your right
arm would be the right side of the unit and where the standard
confi guration Zone Controller Actuator Package would be
mounted over the damper shaft. If you have a left-hand termi-
nal unit, the actuator will need to be rotated 180 degrees within
the plastic enclosure and the enclosure assembly fl ipped over
to mount over the damper shaft on the left side of the terminal
unit. The enclosure base is designed with the appropriate holes
and cutouts to allow for these two mounting options. A left-hand
label is also included with the actuator and can be applied over
the right-hand label for left-hand control locations when desired.
2. If you need to rotate the damper actuator from its factory
supplied position, fi rst unplug the actuator cable from the actua-
tor, then remove the (3) screws on the back side of the enclosure
base that secure the actuator to the enclosure’s base. Rotate
the actuator 180 degrees and re-install the (3) screws you just
removed into the mating holes on the enclosure base and tighten
them to secure the actuator to the base.
3. Turn the enclosure base/actuator assembly back over to its
original mounting position so the actuator is facing up. All instal-
lation instructions are based on the damper moving clockwise to
open (see the note below if your damper requires counterclock-
wise-to-open rotation). Check the damper for proper rotation and
mark the end of the damper shaft to indicate open and closed
positions. Loosen the (2) shaft mounting bracket nuts on the
ends of the universal mounting clamp enough to slide the entire
actuator and plastic enclosure assembly over the terminal unit
damper shaft. Rotate the enclosure base/actuator assembly until
it is approximately level and perpendicular with the terminal
unit mounting surface or enclosure side walls. Use the included
self-tapping mounting screw to secure the enclosure base to the
terminal unit sheet metal or terminal unit control enclosure sur-
face. This is done by inserting the screw through the anti-rotation
bushing, centering it and the bushing in the mounting slot, and
using a battery powered drill to tighten it until the screw head
is fl ush with the top surface of the anti-rotation bushing. Do not
over tighten the screw!
4. Turn the damper blade to its fully closed position. With the man-
ual override clutch button depressed, rotate the actuator clamp
to within approximately
1 /
16
in. to ⅛ in. of the distance between
the actuator stop and the clamp. This varies depending on the
damper seal design and thickness. Finger-tighten the universal
clamp mounting nuts. Then tighten the two nuts again with an
8 millimeter wrench to approximately 3-5 ft./lb. of torque. On
dampers with edge seals, the actuator will compress the damper
blade seal when reaching the end position. Adjust the end stops,
if required. Re-attach the actuator cable removed in step #2 to
the actuator.
NOTE: If the damper on the terminal unit cannot be installed for
clockwise-to-open operation, the VAV/Zone Controller
Actuator Package can be confi gured for counterclock-
wise-to-open operation through the WCC SCUSCR soft-
ware program. It must be changed prior to system start-up
for the designated units for the zone damper to function
properly. See page 21 of this manual for detailed, reverse
acting confi guration information. Installation for reverse
acting confi gurations is the same as for clockwise-to-open
units except all references to clockwise will now be in
the counter-clockwise direction.
Important Wiring Considerations
Please carefully read and apply the following information when wiring
the VAV/Zone Controller Actuator Package. See Figure 7 for VAV/
Zone Controller Actuator Package wiring and connections. See Figure
12 for connecting and wiring multiple VAV/Zone Controller Actuator
Packages in a system.
1. Size and wire the VAV/Zone Controller Actuator Package(s) per
the instructions. Failure to size the transformer and/or wire the
VAV/Zone Controller Actuator Package(s) correctly may cause
the VAV/Zone Controller Actuator Package to operate erratically
or not at all. See Figure 13 for wiring and transformer sizing
information.
2. If a Discharge/Duct Air Temperature Sensor is to be connected,
the minimum wire size used should be 24 gauge.
3. Do not pry on the connectors when connecting or
disconnecting the modular cables. Be sure to push in on the
connector release clip and then pull straight up.
4. Communications wiring should be 18 gauge 2 conductor twisted
pair with shield, Belden #82760 or its equivalent. This type of
wire is available from WattMaster.
9 VAV/Zone Controller Actuator Package Technical Guide
Installation & Wiring