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HVAC Control
APPENDIX F
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.
F.1 Control Module Operation
F.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 relay 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 77).
•
Program the control relay 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 77).
•
Monitor the control relay module using an addressable monitor module programmed for
Trouble Monitor. The monitor module label should be programmed to indicate HVAC
SHUTDOWN. When the control relay module is active (HVAC SHUTDN), the monitor
module will indicate a trouble condition at the FACP and the display should indicate that 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 relay module remains activated and the fans remain off. The monitor
module programmed for Trouble Monitor which is being used to supervise the control relay
module, will indicate a trouble 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 relay
module is deactivated by the HVAC RESTART module.
F.2 Monitor Module Operation
F.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 relay 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 relay module and restart the fans (refer to Type
Monitor under the section titled "Edit Module Screen for Monitor Module" on page 68).
The HVAC RESTART monitor module does not latch when activated. Pressing a switch connected
to the monitor module will deactivate the HVAC SHUTDN control relay module only if there are
no alarm conditions. The HVAC SHUTDN control relay module can be deactivated if trouble
conditions exist on the FACP.
198
HVAC Control
MS-9050UD PN 52413:C 01/23/08
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