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RT-SVX094A-EN
Unit Nameplate
A Mylar unit nameplate is located on the unit corner
support next to the filter access panel. It includes the unit
model number, serial number, electrical characteristics,
refrigerant charge, and other pertinent unit data.
Compressor Nameplate
The nameplate for the compressors are located on the side
of the compressor.
System Input Devices and
Functions
The Symbio™ 700 controller requires a zone sensor or
thermostat input to operate the unit in a CVZT or VVZT
configuration.
Note: Use of a conventional thermostat will reduce unit
functionality.
The number of available modes depends on the type of
zone sensor or thermostat selected. Descriptions of the
basic input devices used with the Symbio 700 network are
provided to acquaint the operator with the various modules.
Refer to the unit schematic for specific module
connections. The following controls are available from the
factory for field installation.
Drain Pan Condensate Overflow Switch
A condensate overflow condition is detected by a
condensate overflow float switch.
When the condensate level reaches the trip point, the
diagnostic condition is detected.
When the condensate overflow input closes for 6 seconds,
the following actions are taken by the Symbio™ 700
controls:
• An auto-reset diagnostic is generated. All compressor
or heating operations are disabled immediately.
Condenser fans and compressors are de-energized
and supply fan operation shutsdown.
• Once the overflow condition is cleared and the input is
open for 6 seconds, all diagnostic conditions are
cleared. The unit returns to normal operation. Auto-
reset clearing occurs twice each time the unit is
powered up. On the third occurrence, the unit initiates a
lock-out and requires manual reset. If an auto- reset
overflow occurs once, but does not occur again for 72
hours, the trip counter will reset allowing more auto-
resets to occur.
Phase Monitor
This sensor monitors voltage between three conductors of
the three-phase power supply. Two LED lights are
provided:
• The green light indicates that a balanced three-phase
supply circuit is properly connected.
• The red light indicates that unit operation has been
prevented. There are two conditions that will prevent
unit operation:
– The power supply circuit is not balanced with the
proper phase sequence of L1, L2, L3 for the 3
conductors of a three-phase circuit.
– The line to line voltage is not between 180 volts and
633 volts.
Discharge Line Temp Switch (DLTS)
The DLTS is looped in series with HPC and LPC. It
prevents the compressor from overheating (over 300°F
dome temp) in case of indoor fan failure (cooling) or
outdoor fan failure (heating).
Power Exhaust Control (Optional)
The power exhaust fan starts whenever the position of the
outdoor air damper meets or exceeds the relief enable
position setpoint when the indoor fan is on.
Evaporator Frost Control
Frostat™ is standard on all units.
Sensors
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*.
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, and 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.
General Information
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