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RT-PRC010-EN80
guide vanes open and the exhaust fan
should be turned off.
- Supply fan - On.
- Supply fan VFD - On (60 Hz) (if
equipped)
- Inlet guide vanes/VAV boxes - Open
(if equipped).
- Exhaust fan - Off, exhaust dampers -
Closed (if equipped).
- Exhaust fan VFD - Off (0 Hz) (if
equipped)
- Outside air dampers - Open.
- Heat - all stages - Off, Modulating heat
output at 0 vdc.
- Occupied/Unoccupied output -
Energized
- VO relay - Energized
EXHAUST sequence “C”
With only the exhaust fans running
(supply fan off), the space that is
conditioned by that rooftop would
become negatively pressurized. This is
desirable for clearing the area of smoke
from the now-extinguished fire, possibly
keeping 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).
- Exhaust fan - On, exhaust dampers -
Open (if equipped).
- Exhaust fan VFD - On (60 Hz) (if
equipped)
- Outside air dampers - Closed.
- Heat - all stages - Off, Modulating heat
output at 0 vdc.
- Occupied/Unoccupied output -
Deenergized
- VO relay - Energized
PURGE sequence “D”
Possibly this sequence could be used for
purging the air out of a building before
coming out of Unoccupied mode of
operation on VAV units or when the
purging of smoke or stale air is required
after a fire.
- Supply fan - On.
- Supply fan VFD - On (60 Hz) (if
equipped)
- Inlet guide vanes/VAV boxes - Open
(if equipped).
- Exhaust fan - On, exhaust dampers -
Open (if equipped).
- Exhaust fan VFD - On (60 Hz) (if
equipped)
- Outside air dampers - Open.
- Heat - all stages - Off, Modulating heat
output at 0 vdc.
- Occupied/Unoccupied output -
Energized
- VO relay - Energized
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/VFD controlled by
supply air pressure control function
with supply air pressure high limit
disabled.
- Exhaust fan - On, exhaust dampers -
Open (if equipped).
- Exhaust fan VFD - On (60 Hz) (if
equipped)
- Outside air dampers - Open.
- Heat - all stages - Off, Modulating heat
output at 0 vdc.
- Occupied/Unoccupied output -
Energized
- VO relay - Energized
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 (5) five
sequences may be locked into the
software by simple key strokes at the
Human Interface Panel.
4
Human Interface Panel (H.I.)
The Human Interface (HI) Panel provides
a 2 line X 40 character clear English
liquid crystal display and a 16 button
keypad for monitoring, setting, editing
and controlling. The Human Interface
Panel is mounted in the unit’s main
control panel and is accessible through a
hatch built into the unit’s control panel
door.
The optional remote-mount version of
the Human Interface (RHI) Panel has all
the functions of the unit-mount version
except Service Mode. To use a RHI the
Controls (VAV/CV Units)