SCXF-SVX01T-EN
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UNIT OFF Sequence “A”
When complete system shut down is required, the following
sequence can be used.
• Supply fan—off
• Supply fan VFD—off (0 Hz)
• Outside air dampers—closed
• Heat—all stages—off, modulating heat output at 0 Vdc
• Occupied/Unoccupied output—de-energized
• VO relay—energized
• Exhaust fan (field provided -installed)—off
• Exhaust damper (field provided -installed)—closed
PRESSURIZE Sequence “B”
This override sequence can be used if a positively
pressured space is desired instead of a negatively
pressurized space.
• Supply fan—on
• Supply fan VFD—on (60 Hz)/VAV boxes— open
• Outside air dampers—open
• Heat—all stages—off, hydronic heat output at 0 Vdc
• Occupied/ unoccupied output—energized
• VO relay—energized
• Exhaust fan (field provided -installed)—off
• Exhaust damper (field provided -installed)—closed
EXHAUST Sequence “C”
With the building’s exhaust fans running and the unit’s
supply fan off, the conditioned space becomes negatively
pressurized. This is desirable for clearing the area of
smoke when necessary; i.e. from an extinguished fire, to
keep smoke out of areas that were not damaged.
• Supply fan—off
• Supply fan VFD—off (0 Hz)
• Outside air dampers—closed
• Heat—all stages—off, hydronic heat output at 0 Vdc
• Occupied/Unoccupied output—de-energized
• VO relay—energized
• Exhaust fan (field provided -installed)—on
• Exhaust damper (field provided -installed)—open
PURGE Sequence “D”
This sequence can purge the air out of a building before
coming out of unoccupied mode of operation in a VAV
system. Also, it can be used to purge smoke or stale air.
• Supply fan—on
• Supply fan VFD—on (60 hz)/VAV boxes—open
• Outside air damper—open
• Heat—all stages—off, modulating heat output at 0 Vdc
• Occupied/Unoccupied output—energized
• VO relay—energized
• Exhaust fan (field provided -installed)—on
• Exhaust damper (field provided -installed)—open
PURGE with Duct Pressure Control “E”
This sequence can be used when supply air control is
required for smoke control.
• Supply fan—on
• Supply fan VFD—on (if equipped)
• Outside air dampers—open
• Heat—all stages—off, hydronic heat output at 0 Vdc
• Occupied/unoccupied output—energized
• VO relay—energized
• Exhaust fan (field provided -installed)—on
• Exhaust damper (field provided -installed)—open
Note: Each system (cooling, supply air, etc.) within the unit
can be redefined in the field for each of the five
sequences, if required. Also the definitions of any or
all of the five sequences can be locked into the
software by simple key strokes at the human
interface panel. Once locked into the software, the
sequences cannot be changed.
Trane Communications Modules
Lontalk®/BACnet® Communication Interface
Module
(LCI/BCI - Optional - used on units with Trane ICS™ or 3rd
party Building Automation Systems)
The LonTalk/BACnet Communication Interface modules
expand communications from the unit UCM network to a
Trane Tracer Summit™ or a 3rd party building automation
system and allow external setpoint and configuration
adjustment and monitoring of status and diagnostics.
The LCI-I (Lontalk) utilizes an FTT-10A Free Topology
transceiver, which supports non-polarity sensitive, free
topology wiring, which allows the system installer to utilize
star, bus, and loop architectures. This controller works in
standalone mode, peer-to-peer with one or more other
units, or when connected to a Trane Tracer Summit or a
third party building automation system that supports
LonTalk.
The BCI-I (BACnet) utilizes the BACnet defined MS/TP
protocol as defined in ASHRAE standard 135-2004. This
controller works in standalone mode, with Tracer SC® or
when connected to a third party building automation
system that supports BACnet.
Exhaust/Comparative Enthalpy Module
(ECEM - Optional used on units with Statitrac and/or
comparative enthalpy options)
The Exhaust/Comparative Enthalpy module receives
information from the return air humidity sensor, the outside
air humidity sensor, and the return air temperature sensor
Controls
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