HVAC Control | Monitor Module Operation |
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 59).
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.
Note: Activation of the HVAC OVRRIDE module causes a trouble event that will be communicated to the Central Station if enabled.
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