12 ACC-SVN203C-EN
Economizer Controller
NOTICE
Equipment Damage!
Electrostatic discharge can short equipment circuitry.
Ensure that you are properly grounded before handling
the sensor.
Notes:
• Upon power up or after a power outage or brownout
(or if po
wer goes below 18 Vac), the controller begins
a 5 minute power up delay before enabling
mechanical cooling. Power must be above 18 VAC for
the delay to become functional.
• The controller will be in “Setup
” mode for the first 60
minutes after powered. If a sensor for outside air or
one of the Sylk Bus devices (sensor or actuator) is
disconnected during the set up mode, the controller
will not alarm that failure. The mixed air temperature
sensor is a system “critical sensor”; if it is removed
during the set up mode the controller will alarm. After
60 minutes the controller will change to “Operation”
mode and all components removed or failed will alarm
in the operation mode.
• T
he terminals on MAT, OAT and S-BUS sensors are
polarity insensitive.
Controller User Interface and
Keypad
The user interface consists of an LCD display and a 4-
button keypad on the front of the economizer module. The
LCD is a 16 character by 2 line dot matrix display.
Figure 16. Controller user interface and keypad
Table 2. Economizer module - left hand terminal blocks
Label Type Description
Top Left Terminal Block
MAT
MAT
20k NTC and
COM
Mixed Air Temperature Sensor (polarity
insensitive conne
ction)
OAT
OAT
20k NTC and
COM
Outdoor Air Temperature Sensor (polarity
insensitive conne
ction)
S-BUS
S-BUS
SYLK Bus
Sylk Bus Sensor (polarity insensitive
connection)
Bottom Left Te
rminal Block
IAQ 2-10 2-10 Vdc
Air Quality Sensor Input (e.g. CO
2
sensor)
IAQ COM COM Air Quality Sensor Common
IAQ 24V 24 Vac Air Quality Sensor 24 Vac Source
ACT 2-10 2-10 Vdc Damper Actuator Output (2-10 Vdc)
ACT COM COM Damper Actuator Output Common
ACT 24V 24 Vac Damper Actuator 24 Vac Source
n/a The last pin is not used
Table 3. Economizer module - right hand terminal
blocks
Label Type Description
Top Right Terminal Block
n/a The first pin is not used
AUX2 I 24 Vac IN
Shut Down (SD) or Heat (W)
Conventional only o
r Heat Pump
Changeover (O/B) in Heat Pump mode
OCC 24 Vac IN Occupied / Unoccupied Input
E-GND EGND Earth Ground - System Required
EXH1 24 Vac OUT Exhaust Fan 1 Output
AUX1 O 24 Vac OUT
Programmable:
Exhaust fan 2 Output or ERV or System
Alarm out
put
Bottom Right Terminal
Block
Y2-I 24 Vac IN
Y2 in - Cooling Stage 2 Input fr
om Space
Thermostat
Y2-O 24 Vac OUT
Y2 out - Cooling Stage 2 Output to Stage
2 Mechanical Cooling
Y1-I 24 Vac
IN
Y1 in - Cooling Stage 1 Input fr
om Space
Thermostat
Y1-O 24 Vac OUT
Y1 out - Cooling Stage 1 Output to Stage
1 Mechanical Cooling
C CO
M 24 Vac Common
R 24 Vac 24 Vac Power (Hot)
Scroll
(up/down)
Buttons
Select (Enter)
Button
Menu Up
(Exit)
Button
2 Line LCD
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