Unit installation

Controls
SCXF-SVX01K-EN 67
functions such as; space pressurization, exhaust, purge,
purge with duct pressure control, and unit off.
Once the ventilation sequences are configured, they can
be changed unless they are locked using the HI. 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-installed) - off
• Exhaust damper (field-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-installed) - off
• Exhaust damper (field-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-installed) - on
• Exhaust damper (field-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-installed) - on
• Exhaust damper (field-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-installed) - on
• Exhaust damper (field-installed) - open
Note: Eac
h system (cooling, exhaust, 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 may
be locked into the software by simple key strokes at
the human interface panel. Once locked into the
software, the sequences cannot be changed.
LonTalk
®
Communications Interface (LCI-I)
Module
The LonTalk Communication Interface for IntelliPak self-
contained (LCI-I) controller expands communications
from the unit UCM network to aTraneTracer Summit or a
3rd party building automation system, utilizing LonTalk,
and allows external setpoint and configuration
adjustment and monitoring of status and diagnostics.The
LCI-I utilizes an FTT-10A FreeTopology transceiver, which
supports nonpolarity 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 aTraneTracer Summit or a 3rd party building
automation system that supports LonTalk.