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RT-SVX077A-EN
Compressor/Inverter Protection
Symbio™ 700 control receives input from the inverter drive
for any errors encountered by the drive, refer to Packaged
Rooftop Air Conditioners Precedent™ eFlex™
Troubleshooting Guide (RT-SVD008*-EN). If an error is
encountered before the compressor has run for three
minutes, Symbio™ 700 begins counting errors. The drive
will automatically reset when the error condition clears and
Symbio™ 700 will try to start the compressor again, if a call
for cooling remains and three minutes have passed since
the compressor last ran. If Symbio™ 700 counts four such
errors within 30 minutes, the system will go to manual lock
out mode. Refer to Packaged Rooftop Air Conditioners
Precedent™ eFlex™ Troubleshooting Guide (RT-
SVD008*-EN) for potential causes.
Low Pressure Control
When the LPC is opened for 1 continuous second, the
compressor for that circuit is turned off immediately. The
compressor will not be allowed to restart for a minimum of 3
minutes.
If four consecutive open conditions occur during an active
call for cooling, the compressor will be locked out, a
diagnostic generated, if applicable, and a manual reset
required to restart the compressor.
High Pressure Control
The high pressure controls are wired in series between the
compressor outputs on the Symbio™ controller and the
compressor contactor coils. If the high pressure control
switch opens, the controller senses a lack of current while
calling for cooling and locks the compressor out.
If four consecutive open conditions occur during an active
call for cooling, the compressor will be locked out, a
diagnostic generated, if applicable, and a manual reset
required to restart the compressor.
Zone Sensors
Manual Changeover (BAYSENS106*)
This sensor features three system switch settings (Heat,
Cool, and Off) and two fan settings (On and Auto). It is a
manual changeover control with single setpoint.
Manual/Automatic Changeover
(BAYSENS108*)
This sensor features four system switch settings (Heat,
Cool, Auto, and Off) and two fan settings (On and Auto). It
is a manual or auto changeover control with dual setpoint
capability. It can be used with a remote zone temperature
sensor BAYSENS077*.
Wall Mounted Relative Humidity Sensor
(BAYSENS036*)
Field installed, wall mounted humidity sensor that
measures temperature and relative humidity. Relative
humidity input is used to control activation of
dehumidification
Duct Mounted Relative Humidity Sensor
(BAYSENS037*)
Field installed, duct mounted humidity sensor that
measures temperature and relative humidity. Relative
humidity input is used to control activation of
dehumidification.
Integrated Comfort System
(BAYSENS073*)
This sensor features remote zone sensing and timed
override with override cancellation. It is used with a Trane
Integrated Comfort™ building management system.
Integrated Comfort System
(BAYSENS074*)
This sensor features single setpoint capability and timed
override with override cancellation. It is used with a Trane
Integrated Comfort™ building management system.
Remote Zone Sensor (BAYSENS016*)
This bullet type temperature sensor can be used for outside
air (ambient) sensing, return air temperature sensing,
supply air temperature sensing, remote temperature
sensing (uncovered). Wiring procedures vary according to
the particular application and equipment involved. Refer to
the unit’s wiring diagrams for proper connections.
Remote Zone Sensor (BAYSENS077*)
This sensor can be used with BAYSENS106*, 108*, 110*,
800* Remote Panels. When this sensor is wired to a
BAYSENS800* Remote Panel, wiring must be 18 AWG
Shielded Twisted Pair (Belden 8760 or equivalent). Refer to
the specific Remote Panel for wiring details.
Thermostat
The unit must have a thermostat to operate.
• BAYSTAT151
One Heat/One Cool Auto changeover digital display
thermostat.
• BAYSTAT155
Three Heat/Two Cool Auto changeover display
thermostat.
• BAYSENS150
Three Heat/Two Cool Auto changeover digital
display thermostat. Seven day programmable
thermostat with night setback.
General Information
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