Emergency Override - Trane IntelliPak RA 20 Installation, Operation And Maintenance Manual

S S e e q q u u e e n n c c e e o o f f O O p p e e r r a a t t i i o o n n
Table 39. Ventilation override mode
VOM Input
Mode A
(Unit Off)
Mode B
(Pressurize)
Mode C
(Depressurize)
Mode D
(Purge)
Mode E
(Purge with Duct Static Pressure
Control)
(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
91summarizing the unit operation in response to
Emergency Override commands.
90
OUTPUT
Supply fan
Outdoor air damper
Relief fan / Relief damper
VAV Box Relay
Supply fan
Outdoor air damper
Relief fan / Relief damper
VAV Box Relay
Supply fan
Outdoor air damper
Relief fan / Relief damper
VAV Box Relay
Supply fan
Outdoor air damper
Relief fan / Relief damper
VAV Box Relay
Supply fan
Outdoor air damper
Relief fan / Relief damper
VAV Box Relay
Table 40, p.
OPERATION
Off/0%
Closed
Off/Closed
Energized
On/100% (a)
100%
Off/Closed
Energized
Off/0%
0%
On/Open
De-engerized
On/100%
(a)
Open
On/Open
Energized
On/Duct Static Pressure Control
Open
On/Open
Energized
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.
Heat Cool Mode Status
Off
Fan Only
Fan Only
Fan Only
Fan Only
RT-SVX063E-EN