Input Circuits - Fire-Lite Alarms MS-5UD Series Manual

Installation

2.3 Input Circuits

The MS-5UD has five IDCs (Initiating Device Circuits) and the MS-10UD has ten IDCs. Each
circuit is compatible with System Sensor's i
when the detector becomes dirty and a separate supervisory 'freeze' signal when ambient
temperature falls below the detector rating of approximately 45
limit for each IDC is 100 ohms (2,000 ohms per zone for linear heat detection). 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
normally-open contact devices as well as conventional 2-wire or 4-wire, 24 VDC smoke detectors.
Refer to the Fire•Lite Device Compatibility Document for a list of compatible devices.
Initiating Device Circuits can be converted to Style D (Class A) by installing the optional Class A
Converter module. Refer to "CAC-5X Class A Converter Module" on page 33.
Class B Initiating Device Circuits (supervised and power-limited) 4.7 K
(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)
26
UL listed Power Supervision Relay
manual pull stations
heat detectors
Figure 2.5 IDC Connections
MS-5UD and MS-10UD Series Manual — P/N 52626:B1 6/30/2009
3 smoke detectors which generate a maintenance signal
o
F. The maximum loop resistance
Ω
, ½ watt resistor P/N:71252
UL listed compatible
2-wire smoke detectors
Dummy load all unused
circuits - 4.7 K
resistor (P/N: 71245)
Input Circuits
smoke detectors, any
3
Ω
, ½ watt