Trane Modular 20 to 35 Tons Liste des pièces télécharger pdf (Page 46)

46 PKG-PRC003U-EN

Controls

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)

• Outside air dampers – closed

• Heat – all stages – off, modulating heat output at 0 vdc

• Occupied/unoccupied output – deenergized

• 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)/VAV boxes – open (if equipped)

• Outside air dampers – open

• Heat – all stages – off, modulating heat output at 0 vdc

• Occupied/unoccupied output - energized

• 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 conditioned 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)

• Outside air dampers – closed

• Heat – all stages – off, modulating heat output at 0 vdc

• Occupied/unoccupied output – deenergized

• 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)/VAV boxes – open (if equipped)

• Outside air damper – open

• Heat – all stages – off, modulating heat output at 0 vdc

• Occupied/unoccupied output – energized

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Trane Modular 20 to 35 Tons Liste des pièces Page 46

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