Emergency Override Definitions (With Lci Or Bci Module Installed) - Trane S*HF*20-75 Troubleshooting Manual

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Emergency Override Definitions (with LCI or BCI module installed)

When an LCI or BCI module is installed, the user can initiate one of five (5) Emergency Override sequences that have the
following predefined unit operation via LonTalk or BACnet Communication:
PRESSURIZE
• Supply Fan – On
• Inlet Vanes - Open (if equipped)
• Return Fan VFD – Min
• Return Fan / Exhaust Damper - Off / Closed (if equipped)
• OA Dampers – Open
• Heat - All heat stages Off (staged gas and elec.); Hydronic heat & Mod Gas Heat output at 0%.
• Occupied / Unoccupied output – Energized
• VO Relay - Energized (with VOM module installed)
• VCM Preheater State - Off (with VCM installed)
DEPRESSURIZE
• Supply Fan – Off
• Inlet Vanes - Closed (if equipped)
• Return Fan VFD – Max
• Return Fan / Exhaust Damper - On / Open (if equipped)
• OA Dampers – Closed
• Heat - All heat stages Off (staged gas and elec.); Hydronic heat & Mod Gas Heat output at 0%.
• Occupied / Unoccupied output - De-energized
• VO Relay - Energized (with VOM module installed)
• VCM Preheater State - Off (with VCM installed)
PURGE
• Supply Fan – On
• Inlet Vanes - Open (if equipped)
• Return Fan / Exhaust Damper - On / Open (if equipped)
• Return Fan VFD – Max
• OA Dampers – Open
• Heat - All heat stages Off (staged gas and elec.); Hydronic heat & Mod Gas Heat output at 0%.
• Occupied / Unoccupied output – Energized
• VO Relay - Energized (with VOM module installed)
• VCM Preheater State - Off (with VCM installed)
SHUTDOWN
• Supply Fan – Off
• Inlet Vanes - Closed (if equipped)
• Return Fan / Exhaust Damper - Off / Closed (if equipped)
• Return Fan VFD – Min
• OA Dampers – Closed
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