Four-Wire Smoke Detector Connections - Notifier RP-1001 Installation Manual

Installation Procedure
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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 = (20.6 - V
MAX
(N x I ) + (N
A
S
Where:
R is the maximum resistance of the 24V
MAX
wires.
V is the minimum operating voltage of
OM
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 is the detector current standby.
S
N is the number of detectors on the 24V
A
power loop which must function at
the same time in alarm.
I is the detector current in alarm.
A
I is the end-of-line relay current.
R
)
OM
x I ) + (I )
A
R
%
   
Control Panel
Power Circuit
Figure 2.3 Typical Connection for

Four-Wire Smoke Detector Connections

Listed
Power
Supervision
Relay
UL listed
4.7K,
1/2-Watt
ELR
   
 
+24VR IN #1, 2
Class B
Initiating Device Circuit
Four-Wire Smoke Detectors
RP-1001 15150:F 05/24/2001
UL listed
24 VDC
Four-wire
Smoke
Detectors
%