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Model SS4-A/-A2 Multi-Spectrum Digital Electro-Optical Fire Detector
Installation Guide and Operating Manual
MAN0931_V3_1510-001_RevH_06-13
4-20 mA output
4-20 mA RTN
The fire Alarm and fault relays of a Detector equipped with the MA420-4 Module are not usable. However
the Detector's Verify Relay may still be used as a separate Fire Alarm output. Refer to Table 2:
"Configuration DIP Switch Settings" to set DIP switches properly.
NOTE: J1 is a "loop through" connection to J2. The +24 V supply is connected to J2 pin 4. The red lead
connection of the MA420-4 must stay in J1, pin-4. Also, the 8.66 K Ohm supervising resistor must
remain connected at the Fire Alarm relay contacts J4 pin-4 to J4 pin-1, or a Fault condition will
occur.
2.2.6
Wiring the Detector Relays
a. Insert relay cables into the Detector enclosure base through one of the conduit openings.
Refer to Figure 6.
b. Fire Alarm Relay - Connect wires for Fire Alarm to the appropriate J4 terminals of the
Detector. For Normally Open relay contacts, install wires into pins 3 and 4 and firmly tighten
down the slotted screws with a small screwdriver. The Fire Alarm relay is de-energized during
normal operation and will energize when detecting a fire.
c. Fault Relay – Connect wires for Fault to the appropriate terminals of the J5 connector. For
Normally Closed relay contacts, install wires into pins 3 and 4 and firmly tighten down the
slotted screws with a small screwdriver. The fault relay is energized during normal operation
and with no fault detected, as shown in Figure 2. The fault relay will de-energize when a fault
is detected.
2.2.7
Replacing the Detector Module in the Enclosure.
a. Carefully re-install the module over the three metal standoffs and screw it down with the three
captive screws to the standoffs.
b. If necessary, clean the Detector' sensors and windowed cover per instructions of Section 3.2.
c. Securely screw down the metal enclosure top windowed cover and tighten the Allen-head
"tamper-proof" screw.
J5, pin-4 (+)
J1, pin-1 (-)
Figure 3: SS4 Detector Module with MA420-4 Installed
(Rear View)
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