3.0 SYSTEM OPERATION
UL S2203
CyberCat 50 Operation Manual
3-17
FM 3029134
P/N: 06-368-2
Rev 4, 08/2013
3.3.13 FAN
RESTART
OPERATION
Fan Restart operation provides a means to sequence the restart of AHU fan motors after they have been shut
down in response to a fire alarm event. Fan restart operation can only be accomplished using addressable
relay modules connected to the panel’s SLC loop programmed for ‘AHU Shutdown Relay’ operation. By
default, each AHU Shutdown relay will be set to activate for an ALARM event in any of its assigned zones and
will automatically default to a normally energized relay. Each addressable relay can be configured with a
restart delay (0 – 255 seconds).
Upon activation of an ALARM event, each AHU Shutdown relay will activate and remain active even after the
control panel is reset. After reset, the fan restart sequence must be initiated manually using any of the
following sources: 1) control panel’s “AHU ON” function that can be found in MAINTENANCE MENU 2, 2)
addressable input module configured for “Fan Restart”, 3) peripheral device (i.e., remote display or
input/output card) switch configured for Fan Restart. Once initiated, the panel will start the automatic fan
restart sequence and the AHU Shutdown relays will deactivate according to their programmed time delay
allowing the startup of the AHU fan motors to be staggered.
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Critical Note:
Fan restart shall NOT be used for smoke control operation.
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Critical Note:
Fan restart relay(s) will remain active through a system reset and will only de-activate after
the programmed time delay has expired.
3.3.13.1 AHU FIRE KEY
Activation of the addressable relays for Fan Restart can be further restricted by requiring the activation of an
input module configured for ‘AHU FIRE KEY’ operation before a Fan Restart switch can be acted on by the
panel. This is a system variable that is either enabled or disabled via the panel’s CONFIGURATION MENU 7
> F1-AHUKEY. When enabled, an “AHU FIRE KEY” must be active prior to activation of a Fan Restart switch
in order for the control panel to act upon it. Activation of a Fan Restart switch prior to activation of the ‘AHU
FIRE KEY’ will not start the fan restart sequence. The panel will only indicate the activation of the Fan
Restart switch on its display and the event will be recorded in the panel’s history buffer.
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Note:
If fire key operation is used, the switch (key or button operation) must be installed with limited
access and must be UL 864 listed for Fire Protective Signaling System use.
