Secutron MR-2900 Installation Manual page 19

Conventional Style D (Class A) Circuit
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Figure 8: Conventional Style A (Class A) Wiring
Note: 2-wire smoke detectors cannot be used on this type of circuit. This circuit may be wired on any of
the 24 input circuits on the MR-2900 terminal boards.
Smoke Detector Circuits, Style B (Class B)
Figure 9: Smoke Detector Circuit Wiring, Style B
(Class B) Wiring
Note: This circuit is supported by the MR-2928 Input Circuit Module. This circuit may be wired on any of
the 24 input circuits on the MR-2900 terminal boards.
Smoke Detector Circuits, Style D (Class A)
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NOTE: WIRING REQUIRES
TWO CIRCUITS
Figure 10: Smoke Detector Circuit Wiring,
Style D (Class A) Wiring
Note: This circuit is supported only by the MR-2938 Conventional "Class A" Input Circuit Module. This
circuit may be wired on any of the 24 input circuits on the MR-2900 terminal boards.
EOL-392
EOL DEVICE
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This is a 4-wire power-limited and supervised Style
D (Class A) initiating
conventional normally open contact devices. It is
supported by the MR-2928 module. Maximum wire
loop lengths are shown in Table 2. Devices are
connected as illustrated in Figure 8. The return
wiring must be in a separate conduit.
This is a 2-wire power-limited and supervised Class
B (Style B) initiating device circuit using 2-wire
smoke detectors, conventional normally open
contact devices (optional) and a end-of-line device.
Maximum wire lengths are shown in Table 2. The
end-of-line device is EOL-392 resistor. Detectors
and the end-of-line device are connected as
illustrated in Figure 9. Use only smoke detectors
that are listed for compatibility.
This is a 4-wire power-limited and supervised Style
D (Class A) initiating device circuit using 2-wire
smoke detectors and conventional normally open
contact devices (optional). Maximum wire lengths
are shown in Table 2. Detectors are connected as
illustrated in Figure 10. Use only smoke detectors
that are listed for compatibility. Return wiring must
be in a separate conduit.
MR-2900 Installation Manual
device circuit using
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