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FIGURE 4. TYPICAL FAULT TOLERANT NOTIFICATION APPLIANCE CIRCUIT CONFIGURATION, DCLA (NFPA CLASS A)
24 VDC NAC/SOC output —
Listed, regulated,
reverse polarity,
switched
Power and NAC/SOC 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/SOC
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-1A is required on T6&T7 if host FACP/power supply does not support supervision of control module.
FIGURE 5 TYPICAL NAC/SOC WIRING TO MDL3A SERIES SYNC MODULE, DCLB/DCLA (NFPA 72 CLASS B/CLASS A )
24 VDC NAC/SOC output —
Listed, regulated,
reverse polarity,
switched
Power and NAC/SOC polarities are
shown in alarm.
Class A return: See Note 3
Class A return: See Note 3
)
( –
Class B ELR-47K
See Note 3
)
( +
EOLR-1A
(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/SOC 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.
NOTE 4: MDL3 not required if FACP NAC/SOC is listed to produce the System Sensor Synchronization Protocol
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(A) Series
Sync Module
See Note 4
)
( +
)
( –
)
( –
)
( +
To next control module or to end-of-line relay or
end-of-line resistor. One relay required for each
circuit. NOTE: Some control panels have built-in
supervision and do not require EOLR-1A; refer
to panel documentation.
CONTROL
MODULE
)
( –
)
( +
All wiring shown is supervised.
CONTROL
MODULE
)
( –
)
( +
3
Connect modules to listed
compatible control panels only.
)
( –
)
( +
Signaling Line Circuit/Data
Communication Link (SLC/DCL)
32 VDC max
Twisted-pair wire is
recommended.
(–)
To next
(+)
device
Connect modules to listed
compatible control panels only.
)
( –
)
( +
Signaling Line Circuit/Data
Communication Link (SLC/DCL)
32 VDC max
Twisted-pair wire is
recommended.
(–)
To next
(+)
device
All wiring shown is supervised.
From panel
or previous
device
C1018-02
From panel
or previous
device
C2242-03
I56-3187-003
4/20/2023
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