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Installation
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 (700 ohms for linear heat detection). Do not use 2-wire smoke detectors on input zones used
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 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 31.
Class B Initiating Device Circuits (supervised and power-limited) 4.7 KΩ, ½ watt resistor P/N:71252
(refer to Device Compatibility Document for list of compatible relays)
Resettable 24 VDC
4-wire smoke
detector power
(500 mA maximum)
24
smoke detectors which generate a maintenance signal when the detector
3
o
F. The maximum loop resistance limit for each IDC is 100
UL listed Power Supervision Relay
UL listed compatible 4-wire smoke detector
manual pull stations
heat detectors
Dummy load all unused
circuits - 4.7 KΩ, ½ watt
resistor (P/N: 71245)
Figure 2.5 IDC Connections
MRP-2002 Series Instruction Manual — P/N 53049:E5 7/28/2016
smoke detectors, any
3
Input IDC
Waterflow Circuit
Normally Open
Waterflow
Devices or
Pressure
abort
manual
Switches
switch
release
Input Circuits
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