Control Module Operation

HVAC Control

APPENDIX E HVAC Control

The FACP can be programmed to shut down a building’s HVAC fans in the event of a fire. The fans cannot be restarted until the fire alarm condition has been cleared and the FACP has been reset to a normal (non-alarm) condition.

IMPORTANT! This HVAC feature is not to be used for smoke control. It is only designed to shut down fans during a fire alarm condition.

E.1 Control Module Operation

E.1.1 HVAC SHUTDN

The HVAC SHUTDN type code can be assigned to any addressable control relay module for the purpose of shutting down HVAC fans during a fire alarm condition. Devices connected to a module with this type code are unsupervised. To program this feature in the FACP:

•Program the HVAC SHUTDN type code to the control module which will be used to shut down the fans (refer to Type under the section titled "Edit Module Screen for Control Modules" on page 68).

•Program the control module to a software zone and program alarm input devices which, when activated are to cause fan shutdown, to the same software zone (refer to Zone Assignment under the section titled "Edit Module Screen for Control Modules" on page 68).

•Monitor the control module using an addressable monitor module programmed for Supervisory Auto-resettable. The monitor module label should be programmed to indicate HVAC SHUTDOWN. When the control module is active (HVAC SHUTDN), the monitor module will indicate a supervisory condition at the FACP and the display should indicate the HVAC is shut down.

Once activated, the HVAC SHUTDN control module remains activated, even if the FACP is silenced or reset. After the alarm condition on the FACP has been cleared and the panel reset, the HVAC SHUTDN control module remains activated and the fans remain off. The monitor module programmed for Supervisory Auto-resettable which is being used to supervise the control module, will indicate a supervisory condition at the control panel and the LCD should display that the HVAC is shut down. The fans can only be restarted when the HVAC SHUTDN control module is deactivated by the HVAC RESTART module.

E.2 Monitor Module Operation

E.2.1 HVAC RESTART

The HVAC RESTART type code can be assigned to any addressable monitor module for the purpose of resetting (deactivating) the HVAC SHUTDN control module and turning the fans back on. The HVAC RESTART 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 RESTART type code to the monitor module which will be used to deactivate the HVAC SHUTDN control module and restart the fans (refer to Type Monitor under the section titled "Edit Module Screen for Monitor Module" on page 59).

The HVAC RESTART monitor module does not latch when activated. Pressing a switch connected to the monitor module will deactivate the HVAC SHUTDN control module only if the fire alarm condition has been cleared and the FACP reset to a normal condition. Pressing the switch during an alarm condition will have no effect.

MS-9200UDLS PN 52750:A 11/04/05

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