Johnson Controls System 350T A350P Manual
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Johnson Controls System 350T A350P Manual

Electronic proportional plus integral temperature control
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System 350
The A350P is an electronic, proportional plus integral
temperature control with analog 0 to 10 VDC and
0 to 20 mA outputs. The control is equipped with
three user-selectable time integration constants and
an adjustable throttling range of 2 to 30F° (1 to 17C°).
Two models cover a setpoint range of -30 to 130°F
(-35 to 55°C) and 90 to 250°F (32 to 121°C).
As are all System 350 ™ products, the A350P control
is housed in a NEMA 1, high-impact plastic enclosure.
The modular design provides easy, plug-together
connections for quick installation and future
expandability.
Modular Design
Plug-Together Connectors
and 35 mm DIN Rail
Mounting
Two Models Cover a Wide
Setpoint Range of -30 to
250°F (-35 to 121°C)
Minimum Output Adjustable
from 0 to 60%
Adjustable Throttling
Range of 2 to 30F° (1 to 17C°)
Field-selectable Reverse
or Direct Acting Mode
Three User-Selectable
Integration Time Constants
Interchangeable
Temperature Sensors
© 2014 Johnson Controls, Inc.
Part No. 24-7664-192, Rev. G
Code No. LIT-930020
TM
A350P Electronic Proportional Plus Integral

Temperature Control

Features and Benefits
Enables stage, display, and power modules to
be purchased and installed as needed
Eliminates wiring between modules, which
reduces installation costs
Reduces inventory by encompassing
temperature ranges required to support the
majority of Heating, Ventilation, Air Conditioning,
and Refrigeration (HVAC/R) applications
Tailors the output to the requirements of the
controlled device; can be used to set minimum
valve or damper position
Enables the user to tune the system for optimum
stable performance
Works in heating or cooling applications
Provides selection of the integration constant for
applications requiring proportional plus integral
control
Increase versatility and serviceability
FANs 930, 930.5, 125, 121
Product/Technical Bulletin A350P
Figure 1: A350P Electronic Proportional Plus
Integral Temperature Control
Issue Date 0414
1
www.johnsoncontrols.com

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Summary of Contents for Johnson Controls System 350T A350P

  • Page 1: Temperature Control

    Three User-Selectable Provides selection of the integration constant for Integration Time Constants applications requiring proportional plus integral control  Interchangeable Increase versatility and serviceability Temperature Sensors © 2014 Johnson Controls, Inc. Part No. 24-7664-192, Rev. G www.johnsoncontrols.com Code No. LIT-930020...
  • Page 2 pplication peration The A350P Temperature Control can be used as a The A350P control operates on 24 VAC/VDC and standalone device or in conjunction with plug-together provides two simultaneous analog outputs: accessory modules. The addition of S350 Stage 0 to 10 VDC and 0 to 20 mA. A cover-mounted, Modules allows for the control of multiple stage 10-segment Light-Emitting Diode (LED) bar graph HVAC/R applications.

  • Page 3: Minimum Output Adjustment

    Minimum Output Adjustment Throttling Range (Proportional Band) The minimum output adjustment sets the minimum The throttling range is the range over which a control voltage or milliampere output provided by the A350P is active. Throttling range for the A350P control can be control.
  • Page 4 Proportional Only Control Temperature System Load Proportional Throttling Offset Load Change Range Control Point Follows the Load Setpoint Time Proportional Plus Integral Control Temperature System Load Load Change Proportional Integration adjusts the Offset = 0 proportional output to bring the process to Setpoint setpoint regardless of load.

  • Page 5: Reverse Or Direct Acting Operation

    Reverse or Direct Acting Operation With the operation jumpers in the Reverse Acting (RA) S350A On-Off Stage Modules position, the analog output increases as the S350A On-Off stage modules receive power, setpoint, temperature drops below setpoint. (See Figure 5.) and sensor input from the A350P control. S350A stage With the operation jumpers in the Direct Acting (DA) modules perform switching functions based on the position, the analog output will increase as the...
  • Page 6 imensions 3/16 (4) Mounting Slots for No. 6 Screws 1/2 (13) 5 (127) 2 15/16 A350P (75) 4 (102) 2 3/8 (61) 1 9/16 7/16 (11) (40) Rail Mount 1 3/16 (31) 3 (76) Sensor 2 3/8 (61) 9 3/4 (248) 2 (50) 7/8 (22) Conduit...

  • Page 7: Wiring Terminals

    Wiring Terminals Sensor Connection Install all wiring to conform to the National Electrical Shielded cable is not generally required for sensor Code and local regulations. For maximum electrical wiring on runs of less than 50 feet. When using rating of control, refer to the label inside the control shielded cable, isolate and tape the shield at the cover.
  • Page 8 djustments Follow this procedure to set up the A350P control for Make sure the system is stable in the proportional the types of operation desired. mode before selecting integration. Refer to the Checkout Procedure section. 1. Remove its cover by loosening the four captive cover screws.
  • Page 9 If a Y350R Power Module is used, select DC 2. Check sensor for proper resistance at a given volts on the DVM. Verify that the voltage is temperature. (The resistance across the sensor between 16 and 38 VDC. changes with the temperature of the sensor.) If an external DC power supply is used, select a.
  • Page 10 LEDs in the bar graph should turn on A99B Temperature Sensors and replacement controls from left to right until the fifth or sixth bar is are available through the nearest Johnson Controls on. If not, replace the A350P control. representative. (See Tables 5 and 6 for ordering information.)
  • Page 11 rdering Information Table 5: System 350 Products Item Product Code Number Description A350P Proportional Plus Integral A350PS-1C Range: -30 to 130°F (-35 to 55°C) Temperature Controls Throttling Range: 2 to 30 F° (1 to 17C°) (Includes the A99BC-25C Temperature Sensor) A350PS-2C Range: 90 to 250°F (30 to 120°C)
  • Page 12 The performance specifications are nominal and conform to acceptable industry standards. For application at conditions beyond these specifications, consult Johnson Controls Application Engineering at (414) 274-5535. Johnson Controls, Inc. shall not be liable for damages resulting from misapplication or misuse of its products.

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