FANs 930, 930.5, 125, 121
Product/Technical Bulletin A350
Issue Date 0899
© 1999 Johnson Controls, Inc.
1
Part No. 24-7664-44, Rev. C www.johnsoncontrols.com
Code No. LIT-930010
The A350A/B Series is an on/off electronic
temperature control with a Single-Pole, Double-Throw
(SPDT) relay output and a Light-Emitting Diode (LED)
relay status indicator. Designed to operate with both
heating and cooling equipment, this control includes an
adjustable differential and an interchangeable
temperature sensor.
As are all System 350™ products, the A350A/B is
housed in a NEMA 1, high-impact plastic enclosure.
The modular design provides easy, plug-together
connections for quick installation and future
expandability.
Figure 1: A350 Series Electronic
Temperature Control
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
Mounting
Eliminates wiring between modules and
reduces installation costs
❑ Two Standard Models
Cover Wide Setpoint
Ranges
-30 to 130°F (-34 to 55°C) or
90 to 250°F (32 to 121°C)
Reduces inventory by encompassing
temperature ranges required to support the
majority of Heating, Ventilation, Air
Conditioning, and Refrigeration (HVAC/R)
applications
❑ Wide Adjustable Differential
of 1 to 30F° (0.6 to 16.7C°)
Enables the user to match equipment cycle
rate and/or sequencing for a given application
❑
❑❑
❑ Field-Selectable Mode
Jumpers
Operates in both heating and cooling
applications
❑
❑❑
❑ Available with Either
External or Concealed
Setpoint
Helps deter accidental and unauthorized
adjustments
❑
❑❑
❑ Interchangeable
Temperature Sensors
Increases versatility and serviceability
System 350™
A350A/B Electronic Temperature Control
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