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DS7420i Dual Phoneline/
Bell Supervision Module
Features
▶
One Class A input zone
▶
Two supervised 12 VDC signaling outputs
The DS7420i is an accessory board designed for use with
the DS7400Xi control panel. It allows the control to be used
in NFPA 72 installations. The DS7420i provides two
supervised 12 VDC signaling outputs, one Class A (Style D)
input zone, and dual phone line transmission and
supervision.
Functions
One Class A Input zone
The Initiating Device Circuit (Terminals 13-16) is a
Class A (Style D) loop intended for connection of normally-
open (N/O) dry contact initiating devices such as waterflow
switches.
Note The Class A loop will not support loop powered
devices such as two-wire smoke detectors.
Two Supervised 12 VDC Signaling Outputs
There are two supervised outputs:
•
Auxiliary Output Circuit: A 12 VDC, special application
supervised output that latches on alarm and resets
upon system reset. It is intended for strobes/indicating
appliances and supplies up to 1.0 A.
•
Indicating Appliance Circuit (Bell Output): A 12 VDC,
special application supervised output that supplies up
to 1.75 A for vibrating bells.
Certifications and Approvals
Region Certification
Europe CE 89/336/EEC, EN55022: 1994 +A1: 1995
+A2: 1997 Class A, EN50130-4: 1995
+A1: 1998 +A2: 2003, EN60950-1:
2001, EN61000-3-2: 2000,
EN61000-3-3: 1995 +A1: 2001
1999/5/EC, EN60950 Dec 1992 (2nd
edition) +A1: 1992 +A2: 1993,
EN50081-1: 1992, EN50082-1: 1992
USA UL AMCX: Central Station Alarm Units
(UL1610, UL1635), AOTX: Local Alarm
Units (UL464, UL609), APAW: Police
Station Alarm Units (UL365, UL464),
UTOU: Control Units and Accessories -
Household System Type (UL985)
NYC-MEA 274-93-E, Vol. IV
USA FCC Rules, Part 15 - Class B digital device and
Part 68
Canada IC Canadian Interference‑Causing Equip-
ment Regulations - Class A digital appara-
tus
Installation/Configuration Notes
Commercial Fire Applications
For Commercial Fire applications, the TR1850 transformer
must be enclosed in the AE-TR16 Transformer Enclosure.
The wiring from the AE-TR16 to the control and the wiring
to the outlet box in conduit must also be enclosed in the AE-
TR16 Enclosure.
Wiring
The DS7400Xi control panel must be installed in
accordance with NFPA 72 guidelines. The system is power
limited except for battery terminals. All wiring entering the
system enclosure must be power limited.
Technical Specifications
Auxiliary Power Requirements
Current (Alarm): 140 mA
Current (Supervisory): 20 mA
Voltage: 12 VDC nominal
Environmental Considerations
Temperature (Operating): 0°C to +49°C (+32° to +120°F)
Inputs Initiating Device Circuit
Max. Loop Resistance: 150 Ω total
Output (Auxiliary Output Circuit)
Current Supplied: up to 1.0 A
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