Input Circuits - Fire-Lite MS-2E' MS-4E User Manual

Installation

2.3 Input Circuits

(refer to Device Compatibility Document for list of compatible relays)
UL listed compatible 4-wire smoke detector
Resettable 24 VDC
4-wire smoke
detector power
(500 mA maximum)
+ - +
Nonreset Reset
20
The MS-2 has two IDCs (Initiating Device Circuits) and the MS-4 has four IDCs. Each
circuit is compatible with System Sensor's I
maintenance signal when the detector becomes dirty and a separate supervisory 'freeze'
signal when ambient temperature falls below the detector rating. The maximum loop
resistance limit for each IDC is 100 ohms. The field wiring for each zone is supervised
for opens, shorts and ground faults. All conditions are visually and audibly
annunciated.
Each circuit is configured for Style B (Class B) operation and will accept I
detectors, any normally-open contact devices as well as conventional 2-wire or 4-wire,
24 VDC smoke detectors. In addition, Zone 1 (IDC 1) on the MS-2 and Zone 2 (IDC2)
on the MS-4 can be programmed as combination supervisory and waterflow zones.
Refer to the Fire•Lite Device Compatibility Document for a list of compatible devices.
MS-4 Initiating Device Circuits can be converted to Style D (Class A) by installing the
optional Class A Converter module. Refer to "CAC-4 Class A Converter Module
(MS-4 only)" on page 25.
Class B Initiating Device Circuits (supervised and power-limited)
UL listed Power Supervision Relay
manual pull stations
heat detectors
-
B+ B- B+
NAC 1 NAC 2
Figure 2.4 IDC Connections
smoke detectors which generate a
3
4.7 K Ω , ½ watt resistor P/N:71252
B+ B- B+
B-
ZONE 1 ZONE 2
Input Circuits
smoke
3
UL listed
compatible
2-wire smoke
detectors
Dummy load all
unused circuits - 4.7
K Ω , ½ watt resistor
(P/N: 71245)
B- B+ B- B+ B-
ZONE 3 ZONE 4
Note: Zones 3 & 4
on MS-4 only
MS-2/MS-4 PN 51512:D 10/18/04