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NFW-50X Manual —
P/N LS10129-001NF-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 an alarm condition.
E.1 Control Module Operation
E.1.1 HVAC SHUTDOWN
The
HVAC SHUTDOWN
type code can be assigned to any addressable control relay 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 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 62).
•
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 62).
•
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 57). 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 an MR Series relay (MR-101CR). (Refer to
Type Monitor
under the section titled, “Edit
Module Screen for Monitor Module” on page 57). 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 the 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 an 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
alarms, duct supervisories, photo supervisories, CO alarms, and CO supervisory conditions 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
module
relay
module
FACP
fan
SLC
Figure E.1 HVAC RLY Shutdown
relay 1
relay 2
IDC
SLC
Figure E.2 HVAC NAC Shutdown
smoke
detector
FACP
fan
SLC
24VDC
aux
power
EOLR-1
MR-101CR
SLC
24VDC aux
NAC
SLC
24VDC aux power
monitor
mod
control
mod
relay 1
relay 2
IDC
