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Only the response from the first active smoke control
zone is used to automatically set damper positions and
turn fans on or off according to the design of the smoke
control system. After that, dampers and fans are
controlled manually at the firefighters smoke control
station (FSCS).
One way to prevent subsequent automatic responses
from overriding the FSCS is by using command lists and
the Disable command. The correlations below
demonstrate using this approach on a smoke shaft
exhaust system (see Figure 22 on page 32).
First, write a correlation like the one below for each
smoke control zone. Note that the command list for zone
1 opens the damper for zone 1, the command list for
zone 2 opens the damper for zone 2, and so on.
Second, write a correlation like the one below to activate
the command lists.
VM-1 Smoke Management Application Guide
Chapter 3: Smoke control system programming
Another method is to have all the smoke detectors in
each smoke control zone activate a separate AND
group, and then include commands in the active AND
group's response to disable all of the other AND groups.
Interlocking fans and dampers
Interlocking is a way to prevent equipment damage by
opening and closing dampers, and turning fans on and
off in the proper sequence. For example, turning a
supply fan on before the supply dampers are open may
damage the supply duct and inhibit the smoke control
system's ability to effectively control smoke.
The correlation inputs and outputs shown below can be
used to create correlations that demonstrate how to
program an exhaust fan interlock. Refer to Figure 23 on
page 38 and Figure 24 on page 39.
EXHAUST FAN INTERLOCK – CORR 1
Name:
Inputs:
Startup
Outputs:
ON, Low, Both, EXHAUST_FAN_OFF_RELAY
ON, Low, Both,
ZONE_1_EXH_DAMPR_CLOSE_RELAY
Name:
EXHAUST FAN INTERLOCK – CORR 2
Inputs:
Alarm, ZONE_1_SMK_001
Alarm, ZONE_1_SMK_002
Alarm, ZONE_1_SMK_003
Alarm, ZONE_1_SMK_004
Alarm, ZONE_1_SMK_005
Alarm, ZONE_1_SMK_006
Alarm, ZONE_1_SMK_007
Alarm, ZONE_1_SMK_008
Outputs:
ON, Low, Activation,
ZONE_1_EXH_DAMPR_OPEN_RELAY
OFF, Low, Activation,
ZONE_1_EXH_DAMPR_CLOSE_RELAY
OFF, Low, Restoration,
EXHAUST_FAN_ON_RELAY
ON, Low, Restoration,
EXHAUST_FAN_OFF_RELAY
43
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