MS-4424 15153:F1 06/18/97
15
3.2
Initiating Device Circuits
Zones
Wire all alarm initiating devices sequentially for proper supervision. Initiating devices include: manual pull
station, heat, photoelectric and ionization type detectors; and waterflow alarm devices. Refer to the Device
Compatibility Chart.
Notes:
1)
Observe polarity when connecting polarized devices.
2)
All circuits are supervised and power limited.
3)
Leave Dummy Load (provided) on all unused circuits.
Figure 3.2-1: Example of Initiating Device Circuits
Two-wire
Smoke
Detector
Manual
Pull Station
Heat Detector
IDC #1
IDC #2
IDC #3
IDC #4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
B+ A+ A- B- B+ A+ A- B- B+ A+ A- B- B+ A+ A- B-
TB4
+
-
+
-
+
-
+
-
+
-
+
-
Style B
Initiating Device
Circuit
Style D
Initiating Device
Circuit
+
-
+
-
+
-
Normally
Open
Tamper
Switch
4.7K, 1/2-Watt
(part # 71252
UL listed)
Style B
Supervisory
Circuit
(if SW1 switch 3
is set "ON")
4.7K, 1/2-Watt
(part # 71252
UL listed)
Style B
Initiating Device
Circuit
4.7K, 1/2-Watt
(part # 71252
UL listed)
+
-
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