Trane IntelliPak Signature Series Programming Manual page 8

Ventilation Override Module (VOM)
Definitions
The ventilation override module can be
field-configured with up to five different
override sequences for ventilation
override control purpose. When any one
of the module's five binary inputs are
activated, it will initiate specified func-
tions 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)
(if equipped)
• Inlet guide vanes – closed
(if equipped)
• 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)
(if equipped)
• Inlet guide vanes/VAV boxes – open
(if equipped)
• Outside air dampers – open
• Heat – all stages – off, hydronic heat
output at 0 vdc
8
Programming
• Occupied/ unoccupied output - ener-
gized
• 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 condi-
tioned 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)
(if equipped)
• Inlet guide vanes – closed
(if equipped)
• 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 could be used for purging
the air out of a building before coming out
of unoccupied mode of operation on VAV
units. Also, it can be used to purge smoke
or stale air.
• Supply fan – on
• Supply fan VFD – on (60 Hz)
(if equipped)
• Inlet guide vanes/VAV boxes – Open
(if equipped)
• Outside air damper – Open
• Heat – all stages – Off, Modulating heat
output at 0 vdc
• Occupied/Unoccupied output – Ener-
gized
• 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)
• Inlet guide vanes – controlled by supply
air pressure control function with
supply air pressure high limit disabled
• Outside air dampers – open
• Heat – all stages – off, hydronic heat
output at 0 vdc
General
Information
• Occupied/unoccupied output – energized
• VO relay – energized
• Exhaust fan (field-installed) - on
• Exhaust damper (field-installed) - open
Note: Each 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 using the
human interface panel keypad. Once
locked into the software, the sequences
cannot be changed.
PKG-SVP01B-EN