3.0 SYSTEM OPERATION
UL S2203
CyberCat 254/1016 Operation Manual
3-17
FM
P/N: 06-326-2
Rev 6, 09/2015
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 be accomplished using the panel mounted
CRM4 relay cards (P/N 10-2204) and/or addressable relay modules connected to the panel’s SLC loop
programmed for ‘AHU Shutdown Relay’ operation.
Fan restart operation varies depending upon which component is used to perform the AHU shutdown (i.e.,
CRM4 or addressable relay). The following subsections describe how each component operates during the
fan restart sequence.
Critical Note:
Fan restart shall NOT be used for smoke control operation.
Critical Note:
Fan restart over a panel network can only be accomplished using a monitor module
programmed for “Fan Restart”. Initiation of the fan restart sequence from the panel or peripheral device
will not transmit over the network.
3.3.13.1
CRM4 FAN RESTART OPERATION
Each CRM4 relay can be designated for fan restart operation by configuring it with a restart delay (40 – 250
seconds). Once the relay has been designated for fan restart operation, it automatically defaults to a
normally energized relay and will activate for any ALARM event in any of its zones. CRM4 fan restart can be
configured for manual or automatic operation using the control panel’s ‘FAN RESTART MODE’ function that
can be found in Configuration Menu 4 > F5-Relays > F4-Fan Restart Mode.
Automatic Restart
Upon activation of an ALARM event, the CRM4 relays will activate and remain active even after the control
panel is reset. After reset, the fan restart sequence begins automatically and relays will deactivate according
to their programmed time delay allowing the startup of the AHU fan motors to be staggered. As each relay is
deactivated, the corresponding designation on Rows B and C of this display will go blank. Once all fan restart
relays have deactivated, the panel will return to the ‘System Normal’ screen.
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0
A
A U T O M A T I C F A N S T A R T
B
1 2 A 1 2 B 1 2 C 1 2 D
C
1 3 A 1 3 B 1 3 C 1 3 D
D
A L : 0 0 0 S U : 0 0 0
T R : 0 0 0
Exhibit 3-14: Automatic Fan Restart Display
•
Row A – Displays “AUTOMATIC FAN START”, indicating the fan restart sequence is running.
•
Row B – Displays the CRM4 fan restart relays that have yet to deactivate (P12).
•
Row C – Displays the CRM4 fan restart relays that have yet to deactivate (P13).
•
Row D – Displays the number of alarm (AL), supervisory (SU), and trouble (TR) events present on
the system.
Note:
If all relays are deactivated prior to panel reset (because no alarm was present), then this display is
not shown.