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Chapter 2: Smoke control system hardware
•
Set the Timer option on each GSA-IO module for the
amount of time required for the fan to reach the
required output but not more than 60 seconds.
Figure 23: Typical fan control and monitor circuit
24VDC+
24VDC-
K2
+
SLC_IN+
SLC_IN-
Damper control and monitor
circuit
Figure 24 on page 39 shows a typical damper control
and monitor circuit. During normal operation, the damper
is closed and may be opened by either the HVAC
system or by the automatic fire detection system. During
alarm operation, the automatic fire detection system
activates the GSA-IO module (item 3), which energizes
relay K1 and connects the line input voltage to the
damper actuator (item 1).
The GSA-IO module (item 3) monitors the open limit
switch on the damper actuator and activates a Monitor
event when the switch closes or a Trouble event if the
switch fails to close in the time allowed.
The GSA-IO module (item 4) monitors the closed limit
switch on the damper actuator and activates a Monitor
event when the switch closes or a Trouble event if the
switch fails to close in the time allowed.
38
47K EOLR
(4)
(5)
8
7
CT1
4
3
2
1
•
At startup, activate GSA-IO module (item 6).
HVAC SYSTEM
CONTROLS
K1
+
L
(6)
8
7
6
5
8
7
6
5
IO
IO
4
3
2
1
4
3
2
1
The GSA-CT1 module (item 2) monitors the end-of-line
power supervision relay (K2) and activates a Trouble
event on loss of 24 VDC.
Notes
•
Install relay K1 ahead of the HVAC system
controller.
•
The NFPA 72 Code requires that the wire distance
between control devices and air handling units
(AHUs) does not exceed 36 in. (91.44 cm).
•
24 VDC is from a regulated and filtered power
supply that is UL/ULC Listed for fire protective
signaling service.
(1)
L
N
N
E
47K EOLR
SLC_OUT+
SLC_OUT-
VM-1 Smoke Management Application Guide
(2)
47K EOLR
(3)
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