Johnson Controls System 350 A350A User Manual

System 350 A350A/B Electronic Temperature Control Product/Technical Bulletin
5
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
Wire
Shielded Cable Length
*
Gauge
Feet Meters
14 AWG
800 244
16 AWG
500 152
18 AWG
310 94
20 AWG
200 61
22 AWG
124 38
* 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.
•
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).
A350A/B
S350A
S350A
D350S350A
Load Load Load Load
Y350R
120 VAC
Shield (Connect
to COM on A350)
Sensor
Figure 5: System 350 Powered by Y350R Module

Johnson Controls System 350 A350A Specifications

General

Brand	Johnson Controls
Model	System 350 A350A
Category	Temperature Controller
Language	English