OPERATOR MANUAL // SECTION 2
INSTALLATION
HONEYWELL 18
2.2.5 Wiring the SS4-AS/-AS2 Detector for 4 or 20 mA Current Mode Operation (Optional)
For applications requiring a 4-20 mA analog output, order the Detector with the
Optional 4-20 mA Module Assembly, P/N MA420-4. The module must be
Factory installed and certified along with the Detector.
The following analog output levels are available from the Detector equipped with
the MA420-4 Module. The module is capable of driving a maximum load
impedance of 283 Ohms:
NORMAL Operation 4 +/- 0.6 mA
ALARM 20 +/- 0.6 mA
FAULT < 0.6 mA
To use the analog output of an SS4-AS/-AS2, make the following connections:
24 V DC J2, pin-4
24 V DC RTN J2, pin-1
4-20 mA output J5, pin-4 (+)
4-20 mA RTN J1, pin-1 (-)
The fire Alarm and fault relays of the 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.
Figure 3: SS4 Detector Module with MA420-4 Installed
(Rear View)
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