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FIGURE 4. TYPICAL FAULT TOLERANT NOTIFICATION APPLIANCE CIRCUIT CONFIGURATION, NFPA CLASS A
24 VDC NAC output —
Listed, regulated,
power-limited per NFPA 70,
reverse polarity, switched
Power and NAC polarities are shown in alarm.
47K EOL resistor
is internal at
Terminals
T8 & T9
NOTE 1: Any fault on Terminals T7 and T8 is limited to that zone and does not result in a fault on another zone
when multiple control modules are interconnected.
NOTE 2: For multiple control modules to serve more than one notification zone, 24 VDC reverse polarity NAC
output wiring to T10 & T11 must be within 20ft in conduit, and wiring of T10 and T11 between control modules must
be mechanically protected.
NOTE 3: EOLR-1 is required on T6&T7 if host FACP/power supply does not support supervision of control module.
FIGURE 5 TYPICAL NAC WIRING TO MDL3R SERIES SYNC MODULE, NFPA 72 CLASS B/CLASS A
24 VDC NAC output —
Listed, regulated,
power-limited per NFPA 70,
reverse polarity, switched
Power and NAC polarities are shown in alarm.
Class A return: See Note 3
)
( –
Class B ELR-47K
See Note 3
)
( +
EOLR-1
(shown
energized)
NOTE 1: Any fault on Terminals T7 and T8 is limited to that zone and does not result in a fault on another zone when multiple
control modules are interconnected.
NOTE 2: For multiple control modules to serve more than one notification zone, 24 VDC reverse polarity NAC output wiring to
T10 & T11 must be within 20ft in conduit, and wiring of T10 and T11 between control modules must be mechanically protected.
NOTE 3: CLASS B: Install a 47k EOL resistor and do not loop wires back to T8/T9.
CLASS A: Do not install EOL-47K; resistor is internal at Terminals T8 & T9.
24 VDC CIRCUIT
Do not loop wire on Terminals 10 & 11.
Break wire run to provide supervision of connections.
)
( –
)
( +
)
( –
)
( –
)
( +
)
( +
To next control module or to end-of-line
resistor. See panel manual for resistor values.
REMOVE J1 IN THIS CONFIGURATION.
24 VDC CIRCUIT
Do not loop wire on Terminals 10 & 11.
Break wire run to provide supervision of connections.
)
( –
)
( +
)
( –
MDL3 Series
Sync Module
)
( +
To next control module or to end-of-line
relay. One relay required for each circuit.
NOTE: Some control panels have built-in
supervision and do not require EOLR-1;
refer to panel documentation.
CONTROL
MODULE
)
( –
)
( +
All wiring shown is supervised and power limited.
CONTROL
MODULE
)
( –
)
( +
All wiring shown is supervised and power limited.
3
Connect modules to listed
compatible control panels only.
)
( –
From panel
)
( +
or previous
device
Signaling Line Circuit (SLC)
32 VDC max
Twisted-pair wire is
recommended.
(–)
To next
(+)
device
Connect modules to listed
compatible control panels only.
)
( –
From panel
)
( +
or previous
device
Signaling Line Circuit (SLC)
32 VDC max
Twisted-pair wire is
recommended.
(–)
To next
(+)
device
I56-3500-009
C1018-01
C2242-00
6/23/2021
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