Orion System VAV/Zone Controller - Manual (Page 3)

VAV/Zone Controller 3
Technical Guide
Features
VAV/Zone Controller
This manual applies to the VAV/Zone controller that is included in the
following Orion products:
OE742-XX-VAVZ VAV/Zone Package
Pressure Dependent
OE744-XX-VAVZ VAV/Zone Package
Pressure Independent
OE520-XX VAV/Zone Round Damper
Assembly - Pressure Dependent
OE521-XX VAV/Zone Round Damper
Assembly - Pressure Independent
OE736-XX VAV/Zone Rectangular Damper Kit
The VAV/Zone Controller is used for controlling airflow and operation
of VAV or Zoning terminal units. It is a programmable digital controller
which allows for program setpoints to be stored in non-volatile memory.
The controller is connected to a room sensor via a modular cable as-
sembly which monitors space temperature allowing the VAV/Zone con-
troller to modulate a damper in response to space temperature, duct
temperature and airflow requirements in the controlled space.
The VAV/Zone controller has four integral modular jacks for connec-
tion to the actuator, airflow sensor (for pressure independent applica-
tions), room sensor and relay or analog expansion boards, via modular
cables. Molex cable connections are provided for the 24 VDC power
and system communications. A quick connect terminal connector is also
supplied for connection of the Modular Service Tool to facilitate pro-
Controller Overview
gramming of the controller. The controller has an on-board dip switch
provided for board addressing.
The VAV/Zone controller is provided with two relays for tri-state con-
trol of the damper actuator. All outputs and the relay common are elec-
trically isolated from all other circuitry on the board. All relay outputs
are supplied with transient suppression devices across each set of con-
tacts to reduce EMI and arcing. The relay output contacts are rated for
pilot duty control of a maximum of 2 Amps @ 24 VAC or 24 VDC.
The actuator connects via a modular cable to the board and provides the
VAV/Zone controller with feedback monitoring for precise positioning
of the actuator.
OE322 Output Expansion Boards
The OE322, 3 Relay with Analog Output Expansion board is used in
conjunction with the VAV/Zone Controller board to allow for control
of VAV and Zone terminal units, including series and parallel fan
terminal units with up to 3 stages of electric heat or modulating hot
water heat. The OE322, 3 Relay with Analog Output Expansion board
provides 3 relay outputs for pilot duty switching control, and 1 Analog
output for control of a 0-10 V modulating hot water valve.
The OE322 Output Expansion board connects to the VAV/Zone
controller board by means of a modular cable provided with the
expansion board. Power is supplied to the board by means of this
modular cable. Screw terminals are provided for connection of field
wiring to the relay and analog outputs.
The relay outputs are N.O. contacts with one common terminal. All
outputs and the relay common are electrically isolated from all other
circuitry on the board. All relay outputs are supplied with transient
suppression devices across each set of contacts to reduce EMI and
arcing. The relay output contacts are rated for pilot duty control of a
maximum of 2 Amps @ 24 VAC or 24 VDC. The analog output provides
a 0 – 10 VDC modulating signal output into a 1K ohm minimum load.
Figure 1: VAV/Zone Controller Dimensions
ACTUATOR EXPANSION NET
ADD
8 32 16 2 4 1
SW1 U1
EEPROM
CX1
C2
C4
U3
U2
CX6 U6
RN1
CX9
CX10
EPROM
CX1
1
U9
PA
L
U10
U1
1 PJ4
AIRFLOW SPACE SENSOR
PJ3
R25 R24
D5
C12
R21
R22
JP2
U7
CX7
C9 C10 C11
TB2
AIN GND
AUX
C13
L1
PWR
RV
1
VR1
R33
CX4
U4
CX3
C5
C7
R1
R9 R8 R7 R6 R5 R4 R3
C1
C3
R10
R14 R15 R19 R20
R18
SCAN REC
Q3
D1 D2
Q1 Q2
X1
U5
C8
R16
C6
D4
D3
R32
R23
U8 CX8
C14
OUT
IN
P1
P2
K1 K2 PJ2 PJ1
WDOG
JP1
V
A
V
Z
CONTROLLER
YS101854
REV
.2
R36 R35 R37
R38
P3
HAND HELD
4.00"
6.30”