Trane BAYECON355 Series, Installation Manual

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8 RT-SVN044A-EN
Economizer Controller
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• Upon power up or after a power outage or
brownout (or if power goes below 18 VAC),
the controller begins a 5
5 m miin nu utte e 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 6
60 0 m miin nu utte ess 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.
• The 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 9. 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 connection)
OAT
OAT 20k NTC
and COM Outdoor Air Temperature Sensor
(polarity insensitive connection)
S-BUS
S-BUS SYLK Bus Sylk Bus Sensor (polarity insensitive
connection)
Bottom Left Terminal 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