30
SFP-5UD & SFP-10UD Series Manual—
P/N 52879:C2 1/24/2012
Installation
Input Circuits
2.3 Input Circuits
The SFP-5UD has five IDCs (Initiating Device Circuits) and the SFP-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 tempera-
ture falls below the detector rating of approximately 45
o
F. The maximum loop resistance limit for
each IDC is 100 ohms (700 ohms per zone 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
3
smoke detectors, any
normally-open contact devices as well as conventional 2-wire or 4-wire, 24 VDC smoke detectors.
Refer to the Notifier 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 “N-CAC-5X Class A Converter Module” on page 37.
Figure 2.5 IDC Connections
Class B Initiating Device Circuits (supervised and power-limited) 4.7 K
, 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
, ½ watt
resistor (P/N: 71245)
ms-
10
UDid
c.wmf
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