Trane S*HF*20-75 Troubleshooting Manual page 67

• 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)
FIRE
• Supply Fan – Off
• Inlet Vanes - Closed (if equipped)
• Return Fan / Exhaust Damper - Off / Closed (if equipped)
• Return Fan VFD – Min
• 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)
Ventilation Override Mode Definitions (with VOM installed)
Each of the five VOM modes have factory presets, that when initiated by a VOM contact closure, will accomplish five
predefined operations (listed below). Any of the five sequences may be user-redefined by changing the factory presets
at the unit mounted Human Interface or through Tracer.
Ventilation Override Mode A - (Unit Off)
• Supply Fan – Off
• Inlet Vanes / VFD - Closed / 0%
• Return Fan VFD – Min
• Return Fan / Exhaust Damper – Off / Closed (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 – Deenergized
• VO Relay – Energized
• VCM Preheater State - Off (with VCM installed)
Ventilation Override Mode B - (Pressurize)
• Supply Fan – On
• Inlet Vanes / VFD - Open / 100%
• Return Fan VFD – Min
• Return Fan / Exhaust Damper - Off / Closed (if equipped)
• OA Dampers – Open
• Heat - All heat stages Off (staged gas & elec.); Hydronic heat & Mod Gas Heat output at 0%.
• Occupied / Unoccupied output – Energized
• VO Relay – Energized
• VCM Preheater State - Off (with VCM installed)
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