Input Circuits - Fire-Lite Alarms MS-5024 Product Description

Input Circuits

2.4 Input Circuits
The control panel has five zone input circuits. The maximum loop resistance limit for each is 100 ohms. All field
wiring of each zone is supervised for opens and ground faults. Both conditions are visually and audibly annunciated
as well as communicated to a Central Station.
Each zone is a Style B (Class B) Initiating Device Circuit designed to accept any Normally Open contact device and
conventional 2-wire, 24 volt smoke detectors. Each zone is power-limited to 7.26 mA in standby and 42 mA in
alarm. Zone 3 may also be configured as a Style D (Class A) Initiating Device Circuit. Figure 2-5 illustrates typical
circuit connections. Note that all five initiating zones may be converted to Style D (Class A) by using a CAC-5F Class
A Converter module (refer to Figure 2-15 on page 30).
Zones 1-5 may be programmed as shown below. The factory default is 2-wire smoke detector for all zones.
• 2-wire Smoke Detector (factory default)
• Pull Station
• Normally Open Contact Device
• Supervisory
• Supervisory, autoresettable
Zone 3 may also be programmed as:
• Waterflow silenceable
• Waterflow nonsilenceable
Note: A maximum of five waterflow devices may be used on Zone 3 per NFPA 72.
Four-wire smoke detectors may be connected to any zone. Resettable power is provided via TB4, Terminals 3 & 4.
It is allowable to mix an assortment of device types (i.e. smoke detectors, heat detectors, pull stations, etc.) on any
zone. However, this is not recommended since specific and detailed reports will not be possible. For example, the
report of general fire alarm versus pull station fire alarm or smoke detector fire alarm.
Typical Initiating Device Circuit Connections
FIGURE 2-4:
Style B Initiating Device Circuit
(supervised and power-limited) 4.7K
ohm, ½ watt P/N 71252 UL listed
UL listed compatible 2-wire smoke detector
Manual Pull Station
Heat Detector
Document #50066
Style D Initiating Device Circuit
(supervised and power-limited)
UL listed compatible 2-wire smoke detector
Manual Pull Station
Heat Detector
Dummy load all unused circuits with a
4.7K ELR (P/N 71245) across B+ and B-
MS-5024
Rev. D2 12/03/02 P/N 50066:D2
23