Installation
Input Circuits
26
MS-5UD and MS-10UD Series Manual —
P/N 52626:B1 6/30/2009
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
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 of approximately 45
o
F. The maximum loop resistance
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
3
smoke detectors, any
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.
Figure 2.5 IDC Connections
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)
m
s-10U
Didc.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
