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Monitor Module Operation
E.2.2 HVAC OVRRIDE
The HVAC OVRRIDE type code can be assigned to any addressable monitor module for the
purpose of overriding or preventing the HVAC SHUTDN control modules from activating and
shutting down fan during an alarm or manual evacuate condition. The HVAC OVRRIDE monitor
module acts globally throughout the FACP system and therefore is not programmed to a particular
software zone. To program this feature in the FACP:
• Program the HVAC OVRRIDE type code to the monitor module which will be used to
override the HVAC SHUTDN control module and prevent the fans from turning off (refer to
Type Monitor under the section titled "Edit Module Screen for Monitor Module" on
page 56).
The HVAC OVRRIDE monitor module does not latch when activated. Activating a switch
connected to the monitor module will override all HVAC SHUTDN control modules in the system,
preventing the fans from being turned off and causing the FACP LCD to display an active HVAC
OVRRIDE module. Releasing the switch will allow the HVAC SHUTDN control modules to
activate, turning off the fans.
Important! If an alarm exists in the system and HVAC Shutdown has already occurred, HVAC
OVRRIDE will have no effect on the HVAC SHUTDN control relay modules. HVAC OVRRIDE will
prevent HVAC Shutdown from occurring only if it is initiated prior to an alarm condition.
Note: Activation of the HVAC OVRRIDE module causes a trouble event that will be
communicated to the Central Station if enabled.
FireWarden 100-2/E — P/N 52778:A 11/04/2005
HVAC Control
175
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