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-30/130F SPDT 24v Electronic Proportional Plus Integral Temperature Control

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Manufacturer: Johnson Controls

Description: -30/130F SPDT24vPropCtrl

Category: Temperature Controls

Sub Category: Electronic Controls

System 350TM A350P Electronic Proportional Plus Integral Temperature Control

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

Features and Benefits

❑ Modular Design Enables stage, display, and power modules to
be purchased and installed as needed

❑ Plug-Together Connectors
and 35 mm DIN Rail
Eliminates wiring between modules, which
reduces installation costs

❑ Two Models Cover a Wide
Setpoint Range of -30 to
250°F (-35 to 121°C)
Reduces inventory by encompassing
temperature ranges required to support the
majority of Heating, Ventilation, Air Conditioning,
and Refrigeration (HVAC/R) applications

❑ Minimum Output Adjustable
from 0 to 60%
Tailors the output to the requirements of the
controlled device; can be used to set minimum
valve or damper position

❑ Adjustable Throttling
Range of 2 to 30F° (1 to 17C°)
Enables the user to tune the system for optimum
stable performance

❑ Field-selectable Reverse
or Direct Acting Mode
Works in heating or cooling applications

❑ Three User-Selectable
Integration Time Constants
Provides selection of the integration constant for
applications requiring proportional plus integral

❑ Interchangeable
Temperature Sensors
Increase versatility and serviceability


The A350P Temperature Control can be used as a
standalone device or in conjunction with plug-together
accessory modules. The addition of S350 Stage
Modules allows for the control of multiple stage
HVAC/R applications.

Typical application for the
A350P includes:

• proportional heating control with staged direct
expansion cooling

• simple temperature control for air handling units

• modulating damper actuators for mixed air control

• simple proportional mixed air control

A typical System 350 Temperature Control setup
includes the following:

• A350P Temperature Control

• A99B Series Temperature Sensor

• Y350R Power Module (or 24 VAC Class 2

• S350 Stage Modules

• D350 Digital Temperature Display Module


The A350P control operates on 24 VAC/VDC and
provides two simultaneous analog outputs:
0 to 10 VDC and 0 to 20 mA. A cover-mounted,
10-segment Light-Emitting Diode (LED) bar graph
indicates percentage of output.

Features include:

• adjustable setpoint

• adjustable minimum output

• adjustable throttling range (proportional band)

• selectable integration time constant

• selectable Reverse Acting (RA) or Direct Acting
(DA) mode of operation

IMPORTANT: All System 350 controls are
designed for use only as
operating controls. Where an
operating control failure would
result in personal injury and/or
loss of property, it is the
responsibility of the installer to
add devices (safety, limit controls)
or systems (alarm, supervisory
systems) that protect against, or
warn of, control failure.

Replaces Part Numbers: A350PS-1, CARA350PS-1

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