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Input Circuits
2.3 Input Circuits
The MRP-2002 has six programmable IDCs (Initiating Device Circuits). Each circuit is compatible
with System Sensor's i
becomes dirty and a separate supervisory 'freeze' signal when ambient temperature falls below the
detector rating of approximately 45
ohms. The maximum number of detectors per zone is 25. 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 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 26.
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)
MRP-2002 & MRP-2002E PN 53049:A1 5/01/2008
3
smoke detectors which generate a maintenance signal when the detector
o
F. The maximum loop resistance limit for each IDC is 100
UL listed Power Supervision Relay
manual pull stations
heat detectors
Dummy load all unused
Ω
circuits - 4.7 K
, ½ watt
resistor (P/N: 71245)
Figure 2.5 IDC Connections
smoke detectors, any
3
Ω
, ½ watt resistor P/N:71252
Input IDC
Waterflow Circuit
Normally Open
Waterflow
Devices or
abort
manual
switch
release
Pressure Switches
Installation
21
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