144 NFW-100X Manual — P/N LS10131-001NF-E:C 7/25/2018
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 condi-
tion.
E.1 Control Module Operation
E.1.1 HVAC SHUTDOWN
The HVAC SHUTDOWN type code can be assigned to any addressable control module for the purpose of shutting down HVAC fans
during a fire alarm, duct supervisory, photo supervisory, CO alarm, or CO supervisory condition. Devices connected to a relay module
with this type code are unsupervised. Devices connected to a NAC module with this type code are supervised. To program this feature in
the FACP:
• Program the HVAC SHUTDN RLY or HVAC SHUTDN NAC 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 65).
• Program the control module to a software zone and program fire alarm, duct supervisory, photo supervisory, CO alarm, or CO
supervisory 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 65).
• If using a relay control module for HVAC shutdown, monitor the state of the control module using an addressable monitor module
programmed for Trouble Monitor. (Refer to Type Monitor under section titled “Edit Module Screen for Monitor Module” on
page 60.) The monitor module’s display label must be programmed to display HVAC SHUTDOWN. When a shutdown event
occurs, the control module will both shut down the fans and activate the monitor module. When the control module is active, the
monitor module will indicate a trouble condition at the FACP along with the label HVAC SHUTDOWN.
• If using a NAC control module for HVAC shutdown, monitor the state of the control module using an addressable monitor module
programmed for Trouble Monitor and a MR Series relay (MR-101CR). (Refer to Type Monitor under section titled “Edit Module
Screen for Monitor Module” on page 60.) The monitor module’s display label must be programmed to display HVAC
SHUTDOWN. When a shutdown event occurs, the control module will activate the MR Series relay which in turn will both shut
down the fans and activate the monitor module. When the control module and MR series relay are active, the monitor module will
indicate a trouble condition at the FACP along with the label HVAC SHUTDOWN. Note that the 24 VDC power used by the
control module must be supervised using another addressable monitor module and a EOLR-1 power supervision relay.
Once activated, the HVAC SHUTDOWN control module remains activated, even if the FACP is silenced or reset. After all the fire
alarm, duct supervisory, photo supervisory, CO alarm, and CO supervisory condition on the FACP have been cleared and the panel reset,
the HVAC SHUTDOWN control module remains activated and the fans remain off. The fans can only be restarted when the HVAC
SHUTDOWN control module is deactivated by the HVAC RESTART module.
smoke
detector
monitor
mod
relay
module
FACP
fan
SLC
Figure E.1 HVAC RLY Shutdown
relay 1
relay 2
IDC
SLC
smoke
detector
FACP
fan
SLC
Figure E.2 HVAC NAC Shutdown
24VDC
aux
power
EOLR-1
MR-101CR
SLC
24VDC aux
NAC
SLC
24VDC aux power
monitor
mod
control
mod
relay 1
relay 2
IDC
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