18
VAV/Zone Controller Package
INSTALLATION & WIRING
VAV/Zone Controller Inputs
Analog Space Sensor or Digital Space Sensor
A Standard Room Temperature Sensor that hard wires to the
Space Sensor wiring terminals on the VAV/Zone Controller is
used when an analog sensor is desired. When an E-BUS Digital
Room Temperature Sensor is desired, it can connect to the Digital
Space Sensor wire terminals on the VAV/Zone Controller or it can
be connected to the E-BUS connector on the VAV/Zone Control-
ler using an E-BUS pre-fabricated cable of the desired length.
Discharge Temperature Sensor
This sensor can be used for monitoring the discharge air tempera-
ture of the terminal unit, round damper or rectangular damper
used with the VAV/Zone Controller. The sensor is typically used
when the terminal unit has reheat installed so the true temperature
of the air being supplied to the space can be monitored. It should
be mounted in the discharge duct downstream of the terminal unit
where the VAV/Zone Controller is installed.
NOTE:
If this is a stand-alone damper, this sensor would be
mounted upstream of the damper to act as a Supply
Air Sensor.
Occupied Switch
This input is used when you have a motion switch or window
switch to determine room occupancy and allows for setback of
the heating or cooling during occupied periods.
Window Open Detection Mode
If the “Window Open Detection” button is checked, and the “Oc-
cupied Switch” contacts (located on the VAV/Zone Controller)
are open, the VAV/Zone controller will control to the Unoccupied
Cooling and Heating Setpoints and the Damper will completely
close. When the contacts are shorted, the unit will control to the
Occupied Cooling and Heating Setpoints. If the “Reverse Contact
Polarity” button is checked, then the unit controls to the Unoc-
cupied Cooling and Heating setpoints when the Occupied Switch
contacts are shorted, and control to the Occupied Cooling and
Heating Setpoints when the contacts are open.
Motion Sensor Occupancy Detection
This operation only occurs in the scheduled Occupied Mode.
If the Motion Sensor Occupancy Detection button is checked,
then the Occupancy Detection Time and Occupancy Duration
Timeout setpoints are used to determine the cooling and heating
setpoints of the VAV/Zone controller. A motion sensor is con-
nected to the Occupied Switch contacts (located on the VAV/
Zone Controller) and when motion is detected (contacts shorted
together) for the Occupancy Detection Time period, the control-
ler will display “Occupied Mode” and control to the Occupied
Cooling and Heating setpoints. If no motion is detected for a
period longer than the Occupancy Duration Timeout setpoint, (the
contacts will open) the controller will display “Occupied Room
Empty” and the controller will go to the Occupancy Cooling and
Heating Setback temperatures, until motion is detected again. If
the “Reverse Contact Polarity” button is checked, then the unit
controls the opposite. When no motion is detected (contacts
shorted) the controller will display “Occupied Room Empty” and
unit will control to the Occupancy Cooling and Heating Setback
temperatures, until motion is detected. When motion is detected
(contacts open) for the Occupancy Detection Time period, the
controller will display “Occupied Mode” and control to the Oc-
cupied Cooling and Heating setpoints.
Air
fl
ow Sensor
If the OE326-23I-OR Pressure Independent VAV/Zone Control-
ler is being used, the terminal unit’s pressure pick-up tube must
be connected with FRP tubing to the barb fi ttings on the side of
the VAV/Zone Controller. No wiring connections are required as
the pressure sensor is integral to the VAV/Zone Controller. This
pressure sensor input is used for CFM (airfl ow) calculations.
VAV/Zone Controller Outputs
Auxiliary Reheat Relay
This relay has a dry contact on the VAV/Zone Controller and can
be confi gured for Auxiliary Heat or Box Re-heat. Box Re-heat
is used when you only need 1 stage of electric heat or On/Off
Hot Water Valve. Auxiliary Heat is selected when you are using
Baseboard or some other Heating Source. Use this relay if the
controlled terminal unit is not a fan terminal unit. When you are
using a fan terminal unit or have more than 1 stage of electric
heat, SCR electric heat, or modulating HW heat, the OE325-03
VAV/Zone Controller Expansion Module must be used.
Confi gure the relay for Auxiliary Heat if the heat being controlled
by the controller is baseboard type heat or any other type heat
that does not require airfl ow through box. The relay will be
energized whenever the Space Temperature drops 0.5° below
the Auxiliary Heat Setpoint and the damper will remain in the
position determined by the mode of operation.
If the relay is confi gured for Box Reheat, then the relay will be
energized whenever the Space Temperature drops below the Oc-
cupied Heating Setpoint and the damper will go to the Minimum
Damper During Box Heating Mode Setpoint. The stages of box
reheat will need to be set to 1.
VAV/Zone Controller Inputs and Outputs
