3/12
Service Pin
Connectors
Integrated
Mounting
Brackets
Pressure Sensor Inputs (when equipped)
PRESSURE
LOW
HIGH
Integrated
Mounting
Bracket
E
D
E
D
Figure 5:
VAV-N & ECL-103 series components
Mounting Instructions
The following mounting instructions pertain to controllers that
have a built-in actuator (ECL-VAVS-O, ECL-VAVS, ECL-
VAV, or ECL-VVTS). If mounting a controller without a built-
in actuator (ECL-VAV-N and ECL-103), simply mount the
controller using the integrated mounting bracket(s) and
screw(s) that are provided with the controller.
Each controller is specially designed for easy installation either directly
on an air duct or in a panel by using the integrated mounting collar and
the screw that is provided with the controller. This mounting
arrangement opposes the torque applied to the damper shaft. Mount
the controller as follows:
1. Orient the controller into position on to the damper shaft so that
wiring connections are easily accessible. The controller must be
fitted onto the shaft such that the base of the controller is parallel
to the VAV box (perpendicular to the damper shaft). If the damper
shaft has an external bushing that prevents the controller from
being mounted flush to the side of the VAV box, use a spacer of
the same thickness to compensate and to ensure the controller is
at a right-angle to the shaft to prevent binding.
Condensation from the damper shaft will damage the
controller’s electronics. When the VAV box air supply is
below 10°C (50°F), ensure that any condensation from the
damper shaft or from the VAV box does not enter the
controller’s electronics. Under these conditions, mount the
controller vertically above the damper shaft so that any
condensation from the damper shaft will fall away from the
controller. Further countermeasures may be required in
some installations.
2. Using a power screwdriver, attach the controller to the VAV box
with the screw provided with the controller through the controller’s
mounting bracket slider. Otherwise, mark the screw’s position on
the VAV box with a punch and then drill a hole into the VAV box.
Then attach the controller to the VAV box with the screw provided
with the controller.
Avoid over tightening the mounting screw so as to not strip
the threads. Make sure the screws do not interfere with
damper blade movement.
3. Find the damper position by the marking typically found on the end
of the damper shaft.
Figure 6:
Typical Damper Shaft End Marking
4. Determine the direction required to close the damper: Clockwise
(CW) or Counterclockwise (CCW). Turn the damper shaft with a
pair of pliers to fully close the damper for 90° boxes or fully open
the damper for 45° or 60° boxes.
5. Press and hold down the
Actuator Clutch for Manual Adjustment
button (see Figure 4), and turn the controller’s shaft coupler until it
touches the mechanical end-stop to either the fully closed position
(90° boxes) or the fully open position (45° and 60° boxes).
6. For 90° VAV boxes: If the damper closes CCW, turn the coupler to
the CCW mechanical stop limit. If the damper closes CW, turn the
coupler to the CW mechanical stop limit. The open mechanical
stop is factory preset for 90° boxes.
For 45° and 60° VAV boxes: The mechanical stops must be set for
both the fully closed and fully open damper positions. By installing
the controller at the fully open position, the controller provides the
open mechanical stop for 45° and 60° boxes. The closed damper
seal provides the fully closed stop.
7. Tighten the U-Bolt clamp on to the damper shaft using an 8 mm
(5/16 in.) wrench or socket. Tighten the bolts between 11 and 15
N·m (100 and 130 lb·in).
8. Test for free damper shaft movement: Press and hold down the
Actuator Clutch For Manual Adjustment
button and manually turn
the actuator coupling to be certain that the actuator can rotate from
full closed to full open positions without binding.
9. Connect the VAV box’s flow sensor tubing to the controller’s
Pressure Sensor Inputs
. Create a condensation trap in the
pneumatic tubing by forming it into a vertical loop.
10. Finalize the installation by rotating the damper to the full open
position.
CAUTION: Risk of Property Damage.
Ensure that the
damper is at the full open position before starting the air
handler. Failure to rotate the damper to its full-open position
may result in damage to the Variable Air Volume (VAV) box
or ductwork when the air handler is started.
min. 40 mm (1.5")
Figure 7:
Mounting a controller on a damper shaft
Power Wiring
Voltage:
24VAC/DC; ± 15%, Class 2
This is a Class 2 Product. Use a Class 2 transformer only
(rated at 100VA or less at 24VAC) to power the controller(s).
The Network Guide provides extensive information and requirements
for powering a VAV that uses a L
ON
W
ORKS
network for
communications. It can be downloaded from our website.
When calculating a controller’s power consumption to size the 24VAC
transformer, you must also add the external loads the controller is
going to supply, including the power consumption of any connected
subnet module (for example, for Allure™ Series Communicating
Sensors). See the room device calculator spreadsheet available for
download from our website to determine the power requirements for
the ECL-VAV model:
VAV-Smart Room Control Device
Calculator.xlsm
It is recommended to wire only one controller per 24VAC transformer.
If only one 24VAC transformer is available, determine the maximum
number of daisy-chained VAVs that can be supplied on a single power
cable supplied by a 100 VA transformer, according to the controller’s
expected power consumption including external loads, the cable’s wire
gauge, and the total cable length from the following table. Any
installation condition that is outside of the parameters of Table 1
should be avoided.
