Honeywell MS-2 Manual Do Utilizador

Installation

20

MS-2/MS-4   PN 51512:E  01/18/05

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

3

 smoke detectors which generate a 

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 (zero impedance to ground).  All conditions are 
visually and audibly annunciated.

Each circuit is configured for Style B (Class B) operation and will accept I

3

 smoke 

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.  

TB
1

TB
2

TB
3

B+   B-     B+    B-
  NAC 1    NAC 2

 +     -     +     -

Nonreset   Reset

B+    B-    B+    B-
 ZONE 1  ZONE 2

B+    B-    B+    B-
 ZONE 3  ZONE 4

Class B Initiating Device Circuits (supervised and power-limited)

4.7 K

Ω

, ½ watt resistor P/N:71252

UL listed
compatible 
2-wire smoke 
detectors

manual pull stations

heat detectors

Dummy load all 
unused circuits - 4.7 
K

Ω

, ½ watt resistor 

(P/N: 71245)

Note: Zones 3 & 4 
on MS-4 only

ms-

4idc

.cdr

UL listed Power Supervision Relay

(refer to Device Compatibility Document for list of compatible relays)

Resettable 24 VDC 
4-wire smoke 
detector power 
(500 mA maximum)

UL listed compatible 4-wire smoke detector