72
SCXF-SVX01Q-EN
Once locked, the ventilation sequences cannot be
unlocked.
The compressors and condenser fans disable during
the ventilation operation. If more than one ventilation
sequence activates, the one with the highest priority
(VOM “A”) begins first, with VOM “E” having lowest
priority and beginning last.
A description of the VOM binary inputs follows below.
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
N
No
otte
e:: 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
Summary of Contents for IntelliPak SCRF 25
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