Notifier RP-1001 - Four-Wire Smoke Detector Connections

Installation Procedure Four-Wire Smoke Detector Connections
16 RP-1001 15150:F 05/24/2001
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Initiating Device Circuits 1 or 2 on TB4 can
be used with either Style B (Class B) or
Style D (Class A) wiring.
A maximum of 200mA is available from
the +24VDC four-wire smoke detector
power circuit on TB1 terminals 3 and 4.
Any power that is drawn from the +24VDC
Nonresettable Power on TB2 terminals 1
and 2 must be subtracted from available
four-wire detector power. (See “Specifica-
tions” in Section 1.6 and “Powering
External Devices” in Section 2.7.)
Refer to the Device Compatibility Docu-
ment for suitable four-wire smoke
detectors.
Notes on Style D (Class A) and Style B
(Class B) field wiring:
1. The Power Supervision Relay coil
leads must be connected to the last
detector base 24V screw terminals.
2. Calculation of the maximum allow-
able resistance in the 24VDC
detector power wiring:
R
MAX
= (2 0 .6 - V
OM
)
(N x I
S
) + (N
A
x I
A
) + (I
R
)
Where:
R
MAX
is the maximum resistance of the 24V
wires.
V
OM
is the minimum operating voltage of
the detector or end-of-line relay,
whichever is greater, in volts.
N
is the total number of detectors on the
24V supply loop.
I
S
is the detector current standby.
N
A
is the number of detectors on the 24V
power loop which must function at
the same time in alarm.
I
A
is the detector current in alarm.
I
R
is the end-of-line relay current.
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+24VR
Control Panel
Power Circuit
53[:5FGU
UL listed
24 VDC
Four-wire
Smoke
Detectors
Red
Black
IN #1, 2
Class B
Initiating Device Circuit
Figure 2.3 Typical Connection for
Four-Wire Smoke Detectors
UL listed
4.7K,
1/2-Watt
ELR
Listed
Power
Supervision
Relay
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