RT-SVX063E-EN
91
Table 40. 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.
CCaappaacciittyy LLoocckkoouuttss
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.
CCoooolliinngg CCaappaacciittyy EEnnaabbllee
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.
SSeeqquueennccee ooff OOppeerraattiioonn
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