WattMaster MG331-21-VAVCAV - Manual (Page 2)

Form: WMS-MG320-VAVBOXController-1C.doc
Page 1 of 1
VAV System
Description
The MG320-00-VAV VAVBOX controller is used for
controlling airflow and operation of VAV 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 assembly, which
monitors space temperature allowing the VAVBOX
controller to modulate a damper in response to
space temperature, duct temperature and airflow
requirements in the controlled space.
The MG320-00-VAV VAVBOX Controller has three
integral modular jacks for connection to the actua-
tor, airflow sensor (for pressure independent appli-
cations) and relay or analog expansion boards, via
modular cables. A 2 wire terminal block is provided
for connection of a 24VDC power transformer, a 2
wire terminal block is provided for the Room Tem-
perature Sensor and a 3 wire terminal block is pro-
vided for connection of the communications loop.
The controller has an on-board dip switch provided
for board addressing.
The VAVBOX controller is provided with two relays
for tri-state control of the damper actuator. The
actuator connects via a modular cable to the board
and provides the VAVBOX controller with feedback
monitoring for precise positioning of the actuator.
Mounting
Each VAVBOX controller is provided with a plastic
snap track modular mounting base. The snap track
is designed to be mounted with sheet metal screws
to a flat surface using the pre-punched mounting
slots provided. The VAVBOX controller is then
snapped into place on the snap track providing for
easy field mounting and servicing.
Technical Data MG320-00-VAV
VAVBOX Controller
Specifications: Inputs:
Supply Power 24 Volt AC/DC Room Temperature Sensor Type III-10kohm Sensor
Wire Terminals
Power Consumption 4 VA Maximum Air Flow Sensor
(PI Applications Only) 0-5” H
2
O Velocity Pressure
Modular Cable Connection
Operating Temperature 35 ° F to 125 ° F Power Wire Terminals
Operating Humidity 90% RH Non-Condensing Communications Wire Terminals
Memory EEPROM Duct Temperature Sensor Type III-10kohm Sensor
Wire Terminals
Communications RS-485 - 9600 Baud Outputs:
Mounting Method Snap Track Actuator Modular Cable Connection
Addressing Rocker Type Dip Switch Expansion Boards- Digital or Analog Modular Cable Connection
Three Year Warranty WattMaster reserves the right to change specifications without notice
MG320-00-VAV
VAVBOX Controller
7.00"
4.00"
CX6 SW1 U10
75176
EXP
AN SION
Q3
Q2
D3
VR1
7824
GND
24VAC
M
7824C
T
MC340
64A9936
R17
R16 U7
C7
R15
POWER
R21
REV
.2
YS101 562
MDL
F1
250
D4
R26
LD3
L1
SCAN REC R12
C6
R1
1
TOKEN
NET
LD2
32
R14
R13
R100
LD1
C5
D1 K1
V2
fTimes New
Roman|b0|i0|c0|p18;
G5L-114P-PS
24VDC
CONTACT:
UL / CSA 5A250VAC
fTimes New
Roman|b0|i0|
c0|p18;OMRON
K2
D2
ACTUA TO
R
fTimes New
Roman|b0|i0|
c0|p18;OMRON
fTimes New
Roman|b0|i0|c0|p18;
G5L-114P-PS
24VDC
CONTACT:
UL / CSA 5A250VAC
R10
R9
PJ2
V1
C4
AZZONE
V4.00F
C094
74HC573N B31920PS
TCU32K2V
9936
MS6264L-70PC
EPROM
VREF ADJ
R23
C10
PCB80C552-5-16WP 500650=1/3 DFD9940SM
PHILIPS
EWDOG
COMM
D7
CX10
R25
R28 T'STA
T U1
1
C15
R20 C1
1
R24
8
16
2
4
ADDRE
SS ADD
1 U6 93C46
U5
R19
PHILIPS
U9 CX9
R32
D5
C14
P.U.
R22
C13 LMC662
R27
D5
RAM
C9
C8
80C55
2
CX5
PJ1
C3
R8
R7
R5
R6
R4
C2
C1
X1 74HC259 B31920PS
U2
R1
R2
R3
CX2
Q1
16L8
32K
R34
FLOW
U8
1
RN1
CX8 U4
R18
CX4
8K
RAM
U3
CX3
U1
CX1
Zone Controller Board
Snap Track