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RT-SVX063G-EN
Table 41. Emergency override
Emergency Override Output Operation Heat Cool Mode Status
Shutdown Supply fan Off/0% Off
Outdoor air damper Closed
Relief fan / Relief damper Off/Closed
VAV Box Relay De-energized
Pressurize Supply fan On/100%
(a)
Fan Only
Outdoor air damper 100%
Relief fan / Relief damper Off/Closed
VAV Box Relay Energized
Depressurize Supply fan Off/0% Fan Only
Outdoor air damper 0%
Relief fan / Relief damper On/Open
VAV Box Relay De-energized
Purge Supply fan On/100% Fan Only
Outdoor air damper Open
Relief fan / Relief damper On/Open
VAV Box Relay Energized
Fire Supply fan Off/0% Off
Outdoor air damper Closed
Relief fan / Relief damper Off/Closed
VAV Box Relay De-energized
(a)
Multi Zone-VAV units will perform duct static pressure control.
Operating Mode OFF and Normal
Operating Modes
See operating mode off and other normal operating modes
in Operating Modes section.
Heat/Cool Capacity Lockouts
and Limits
The controller provides the following capabilities to lockout
or limit all heat and cool capacity installed in the equipment.
These capabilities interact. Capacity Lockouts have highest
priority. When Heat Lockout Command and Cool Lockout
Command are not locked-out; the control will limit capacity
based on active Cooling Capacity Enable, Primary Heat
Enable or Demand Limit Setpoint. The lowest commanded
value will be honored.
In an example, Heat/Cool Lockouts are not active. Cooling
Capacity Enable is 60%, Primary Heat Enable is 50% and
Demand Limit Setpoint is 40%; DX cooling and electric
heating capacity will be limited to 40%. If the unit had gas
heat, heat capacity would be limited to 50%. Review each
capability below for details.
Capacity Lockouts
Capacity Lockouts are points available to the building
automation network to provide a method to completely
disable DX Cooling, Gas Heating and Electric Heating.
Cool Lockout Command will disable all DX cooling
capacity. Economizer operation is still possible. Heat
Lockout Command will disable all gas and electric heating
capacity. External heating is not controlled directly by the
Symbio800 and will not be locked out with the Heat
Lockout Command.
If both points are True (locked out) at the same time, both
will be honored. Trane Graphical Programming (TGP2) can
be used to control these points.
Cooling Capacity Enable
Cooling Capacity Enable is a building automation interface
point used to limit DX cooling capacity of the equipment, it
does not limit economizer cooling. The 0-100% value limits
the amount of cooling capacity.
Sequence of Operation
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