Sensor Connection; Cable Lengths - Johnson Controls System 350 A350A Technical Bulletin

Sensor Connection

Shielded cable is not generally required for sensor
wiring on runs of less than 50 ft (15.2 m), but is
recommended for lengths greater than 50 ft (15.2 m).
When using shielded cable, isolate and tape the shield
at the sensor. Connect the shield to the COM sensor
terminal on the A350A/B. (See Figure 2 for terminal
location.) The A99BA-200C sensor, which includes
shielded cable, is available if needed.
Note: At the maximum cable lengths listed in Table 2,
no more than 1F° (0.6C°) error in the sensed
temperature will result due to wire resistance.
Table 2: Recommended Maximum Sensor

Cable Lengths

Shielded Cable Length
Wire
Gauge
Feet
14 AWG
16 AWG
18 AWG
20 AWG
22 AWG
* Values provided are for 2-wire stranded cable.
•
Various A99B Series Temperature Sensors and
mounting hardware are available for use with A350
Series Controls. See Tables 3 and 6. The sensor
must be connected to the COM and SEN terminals
on the four-position terminal strip located at the top
left of the printed circuit board (Refer to Figures 2,
4, and 5.). The sensors are not polarity sensitive.
120 VAC
*
Meters
800 244
500 152
310 94
200 61
124 38
Shield (Connect
to COM on A350)
Y350R
A350A/B
Load
Figure 5: System 350 Powered by Y350R Module
System 350 A350A/B Electronic Temperature Control Product/Technical Bulletin
•
The sensor must be mounted so that it can
accurately sense the temperature of the controlled
medium.
Table 3: Sensors Included With A350A/B
Controls
Control Sensor Included
Sensor lead length is 9-3/4 in. (0.25 m)
A350AA-1C
A99BB-25C; Range: -40 to 212°F
(-40 to 100°C)
A350AA-2C
A99BC-25C; Range: -40 to 248°F
(-40 to 120°C)
A350AA-3C
A99BB-25C; Range: -40 to 212°F
(-40 to 100°C)
A350AB-1C
No Sensor Included
A350AB-2C
No Sensor Included
A350AB-5C
No Sensor Included
A350BA-1C
A99BB-25C; Range: -40 to 212°F
(-40 to 100°C)
A350BA-2C
A99BC-25; Range: -40 to 248°F
(-40 to 120°C)
A350BB-1C
No Sensor Included
•
For more information regarding sensor options and
installation, refer to the A99B Series Temperature
Sensors Product/Technical Bulletin (LIT-125186).
S350A
S350A
Load Load
Sensor
S350A D350
Load
5