90
RT-SVX063E-EN
Table 39. Ventilation override mode
VOM Input OUTPUT OPERATION
Heat Cool Mode Status
Mode A
(Unit Off)
Supply fan Off/0% Off
Outdoor air damper Closed
Relief fan / Relief damper Off/Closed
VAV Box Relay Energized
Mode B
(Pressurize)
Supply fan On/100%
(a)
Fan Only
Outdoor air damper 100%
Relief fan / Relief damper Off/Closed
VAV Box Relay Energized
Mode C
(Depressurize)
Supply fan Off/0% Fan Only
Outdoor air damper 0%
Relief fan / Relief damper On/Open
VAV Box Relay De-engerized
Mode D
(Purge)
Supply fan On/100%
(a)
Fan Only
Outdoor air damper Open
Relief fan / Relief damper On/Open
VAV Box Relay Energized
Mode E
(Purge with Duct Static Pressure
Control)
Supply fan On/Duct Static Pressure Control Fan Only
Outdoor air damper Open
Relief fan / Relief damper On/Open
VAV Box Relay Energized
(a)
Supply fan will operate at full speed or a limited speed not to exceed duct static pressure high limit.
Emergency Override
Emergency override provides the ability for a Building
Automation System to override control of the HVAC
equipment to pressurize, depressurize, purge,
shutdown ventilation to the space for life safety or
smoke control systems. Refer to Table 40, p.
91summarizing the unit operation in response to
Emergency Override commands.
Ventilation Override Mode v/s. Emergency Override
Ventilation Override inputs/output directly connect to
fire smoke control station (FSCS) panel. UUKL 864
requires that firefighters have the ability to manually
override automated smoke control equipment. Manual
changes from a FSCS panel will take precedence over
Emergency Override from the Building Automation
System.
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