MR-2900 Installation Manual
13
Conventional Style D (Class A) Circuit
This is a 4-wire power-limited and supervised Style
D (Class A) initiating device circuit using
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.
Smoke Detector Circuits, Style B (Class B)
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.
Smoke Detector Circuits, Style D (Class A)
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.
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.
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.
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.
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Figure 8: Conventional Style A (Class A) Wiring
EOL DEVICE
EOL-392
Figure 9: Smoke Detector Circuit Wiring, Style B
(Class B) Wiring
NOTE: WIRING REQUIRES
TWO CIRCUITS
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Figure 10: Smoke Detector Circuit Wiring,
Style D (Class A) Wiring
