RT-SVX24Q-EN
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– OA Dampers - Closed; Return Damper - Open
– Heat - All heat stages off; Mod Heat output at 0
VDC
– Occupied/Unoccupied/VAV box output -
Energized
– VOM Relay - Energized (if so equipped)
– Preheat Output - Off
– Return Fan - Off; Exhaust Dampers - Closed (if
so equipped)
– Return VFD - Min (if so equipped)
• EEMMEERRGG__FFIIRREE -- IInnppuutt ffrroomm ffiirree ppuullll bbooxx//ssyysstteemm
– Supply Fan - Off
– Supply Fan VFD - Closed/Min (if so equipped)
– Exhaust Fan - Off; Exhaust Dampers Closed (if
so equipped)
– OA Dampers - Closed; Return Damper - Open
– Heat - All heat stages off; Mod Heat output at 0
VDC
– Occupied/Unoccupied/VAV box output -
Energized
– VOM Relay - Energized (if so equipped)
– Preheat Output - Off
– Return Fan - Off; Exhaust Dampers - Closed (if
so equipped)
– Return VFD - Min (if so equipped)
Ventilation Override Module (VOM)
IImmppoorrttaanntt:: The ventilation override system should not
be used to signal the presence of smoke
caused by a fire, as it is not intended nor
designed to do so.
The user can customize up to five (5) different override
sequences for purposes of ventilation override control.
If more than one VOM sequence is being requested, the
sequence with the highest priority is initiated first.
Sequence hierarchy is the sequence “A” (UNIT OFF) is
first, with sequence “E” (PURGE with Duct Pressure
Control) last. A ventilation override mode can be
initiated by closing any of the five (5) corresponding
binary inputs on the VOM module. A binary output is
provided on the VOM module to provide remote
indication of an active VOM mode. All compressors,
condenser fans and the Humidification output are
deenergized for any VOM sequence. The factory default
definitions for each mode are as follows:
• UUNNIITT OOFFFF sseeqquueennccee ““AA””
When complete system shutdown is required
the following sequence can be used.
– Supply Fan - Off
– Supply Fan VFD - Closed/Min (if so equipped)
– Exhaust Fan - Off; Exhaust Dampers Closed (if
so equipped)
– OA Dampers - Closed; Return Damper - Open
– Heat - All heat stages off; Mod Heat output at 0
VDC
– Occupied/Unoccupied/VAV box output -
Deenergized
– VOM Relay - Energized
– Preheat Output - Off
– Return Fan - Off; Exhaust Dampers - Closed (if
so equipped)
– Return VFD - Min (if so equipped)
– OA Bypass Dampers - Open (if so equipped)
– Exhaust Bypass Dampers - Open (if so
equipped)
• PPRREESSSSUURRIIZZEE sseeqquueennccee ““BB””
Perhaps a positively pressurized space is
desired instead of a negatively pressurized
space. In this case, the supply fan should be
turned on with VFD at 100% speed and exhaust
fan should be turned off.
– Supply Fan - On
– Supply Fan VFD - Max (if so equipped)
– Exhaust Fan - Off; Exhaust Dampers Closed (if
so equipped)
– OA Dampers - Open; Return Damper - Closed
– Heat - All heat stages off; Mod Heat output at 0
VDC
– Occupied/Unoccupied/VAV box output -
Energized
– VOM Relay - Energized
– Preheat Output - Off
– Return Fan - Off; Exhaust Dampers - Closed (if
so equipped)
– Return VFD - Min (if so equipped)
– OA Bypass Dampers - Open (if so equipped)
– Exhaust Bypass Dampers - Open (if so
equipped)
• EEXXHHAAUUSSTT sseeqquueennccee ““CC””
With only the exhaust fans running (supply fan
off), the space that is conditioned by the 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 - Closed/Min (if so equipped)
– Exhaust Fan - On; Exhaust Dampers - Open (if so
equipped)
– OA Dampers - Closed; Return Damper - Open
– Heat - All heat stages off; Mod Heat output at 0
VDC
– Occupied/Unoccupied/VAV box output -
Deenergized
– VOM Relay - Energized
– Preheat Output - Off
– Return Fan - On; Exhaust Dampers - Open (if so
equipped)
– Return VFD - Max (if so equipped)
IInnssttaallllaattiioonn
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