17
MRP-4424 Document 15180 Rev D 03/12/97 15180:D
3.4
Output Circuits
Notification Appliance Circuits
The MRP-4424 can provide two Style Y/Z Notification Appliance Circuits and two Style Y Releasing
Circuits (see section
"Setting MRP-4424 Mode of Operation" for DIP switch configuration). Each circuit
is capable of 1.5 amps of current. Total current drawn from all four circuits cannot exceed 2.25 amps.
Refer to the Device Compatibility Chart. Circuits are supervised and power-limited.
Note:
Wiring must be configured to maintain a minimum voltage of 20.4V on release circuits. Calculation of
maximum allowable resistance:
R
MAX
= 20.6V- 20.4V
I
S
Where: R
MAX
= maximum allowable resistance of wiring
I
S
= solenoid current
Dummy Load all unused Notifi-
cation Appliance Circuits
4.7K, 1/4-Watt
UL-Listed End-of-Line device
4.7K, 1/4-Watt
UL-listed End-of-Line device
Dummy Load all unused
Releasing Circuits
OUT #1
OUT #2
OUT #3
OUT #4
Figure 3.4-1: Notification Appliance Circuits
B+ A+ A- B- B+ A+ A- B- B+ B- B+
Polarized Bell
Polarized Strobe
Polarized Horn
4.7K, 1/2-Watt
UL listed End-of-Line
device
TB2
B+ A+
A-
B-
B+
A+
A-
B-
NC
B+
B- NC
B+
B-
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Style Z
Notification
Appliance Circuit
Style Y Notification
Appliance Circuit
UL listed &
FM approved
Releasing
Devices
Releasing
Circuits
No Connection
No Connection
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