Johnson Controls A421GBF-02 Electronic Temperature Control 24V Front Panel LCD -40F to 212F Range with Temperature Sensor 6.6ft Cable

Description:

Johnson Controls Electronic Temperature Control The A421 Series controls are single stage, electronic temperature controls with a single-pole, double-throw (SPDT) output relay. The controls feature an adjustable backlit LCD for viewing the temperature and status of other functions, and a three-button touchpad for setup and adjustment. An LED indicates the On/Off status of the output relay. The A421 controls are available in 120 VAC and 240 VAC models.  The A421 Control with Defrost allows you to set up regular, passive defrost periods of 1 to 99 minutes. The defrost interval can range from 2 to 24 hours, or be set to 0 (no defrost interval). You can also start or stop a defrost cycle in two ways: using the three-button touchpad on the Advanced Menu or connect a momentary switch to the Binary Input (BIN).  This A421 Control with Defrost also provides sensor offset, temperature setback, adjustable anti-short cycle delay, and a restricted user adjustment mode. The temperature units can be displayed in °F or °C. The temperature adjustment range is -40 to 212°F or - 40 to 100°C.  The A421 controls are available in Type 1/IP20 high-impact plastic enclosures suitable for surface or DIN rail mounting and Type 4X/IP66 watertight, corrosion-resistant surface mount enclosures.  Features: Control Front Panel LCD – displays the temperature, parameters, and status and allows you to adjust the backlight intensity for ambient light conditions. Custom icons display the system and control status. Basic and Advanced Programming Menu – provides two levels of parameter adjustment and control setup, allowing you to set up advanced features in one menu and easily adjust basic parameters in the other menu. On/Off Temperature Adjustment – allows you to select the temperature values at which the relay turns On and Off, which automatically defines the Heating or Cooling mode of operation. Switch-Activated Temperature Setback – allows you to shift the On/Off temperature by an adjustable setback value. When a user-supplied switch closes the binary input control circuit, the control operates at the defined setback temperatures. Adjustable Anti-Short Cycle Delay – allows you to select the minimum time the output relay remains off before the next on cycle; avoiding short cycling, hard starts, and nuisance overload outages on compressors and other inductive applications. Adjustable Sensor Offset – allows you to adjust the displayed temperature to the actual sensed temperature. Optional Restricted Adjustment Mode – allows you to restrict the On/Off adjustment to your defined temperature range. Sensor Failure Mode – allows you to select the relay On/Off state in the event of a sensor or sensor wire failure. Backlight Brightness Level – allows you to adjust the LCD backlight intensity.