Johnson Controls A421GBF-02C Low-Voltage Electronic Temperature Control with A99BB-200C Sensor

Condition: New

The Johnson Controls A421GBF-02C is a low-voltage electronic temperature control unit designed for precise heating and cooling applications. It features a Type 1 (NEMA), IP20-rated enclosure, making it ideal for DIN rail and surface-mount installations. This control unit operates on 24 VAC Class 2 low voltage and includes a Johnson Controls A99BB-200C temperature sensor with a 6.6 ft (2.0 m) cable for accurate temperature readings. The adjustable backlit LCD display provides real-time temperature monitoring, and the three-button touchpad allows easy configuration. The SPDT output relay ensures compatibility with various HVAC and refrigeration applications.

Features:

Electrical & Enclosure Details:

• Operating Voltage: 24 VAC Class 2 (safety extra low voltage)
• Relay Type: Single-Pole, Double-Throw (SPDT)
• Enclosure Type: Type 1 (NEMA), IP20, high-impact plastic
• Mounting: DIN rail or surface mount
• LED Indicator: Shows On/Off status of the output relay

Temperature Control & Adjustments:

• Temperature Range: -40 to 212°F (-40 to 100°C)
• Temperature Display Options: Fahrenheit or Celsius
• Adjustable Anti-Short Cycle Delay: Protects equipment from rapid cycling
• Sensor Offset: Allows fine-tuning of sensor accuracy
• Temperature Setback Mode: For energy-saving operation
• User Adjustment Restriction: Prevents unauthorized changes

Included Sensor:

• Model: Johnson Controls A99BB-200C
• Cable Length: 6.6 ft (2.0 m)
• Accuracy: High precision for reliable readings

Applications:

The A421GBF-02C is suitable for a wide range of HVAC, refrigeration, and industrial temperature control applications, including:

• Commercial Refrigeration Systems
• Walk-In Coolers & Freezers
• HVAC Temperature Monitoring
• Hydronic Heating Systems
• Greenhouse Temperature Control
• Process Cooling & Heating

Comparable Models:

If the A421GBF-02C is unavailable, consider these alternatives:

• Johnson Controls A421ABG-02C (120/240V model, SPDT, Type 4X enclosure)
• Ranco ETC-111000-000 (Single stage, 120/240V, digital temperature control)
• Dixell XR30CX (Refrigeration temperature controller with NTC sensor support)
• Honeywell T775A2009 (Multi-stage temperature controller, programmable)

Related Terms:

• Johnson Controls A421 temperature controller
• 24V electronic temperature control with sensor
• Low-voltage DIN rail temperature control unit
• SPDT output relay HVAC temperature controller
• Johnson Controls A421GBF-02C installation and setup guide

Long-Tail Queries:

1. How to wire a Johnson Controls A421GBF-02C for refrigeration applications?
2. What is the temperature range of the Johnson Controls A421 Series controller?
3. How does the anti-short cycle delay work on the A421 temperature control?
4. What are the differences between the A421GBF-02C and A421ABG-02C models?
5. How to mount a Johnson Controls A421 temperature control on a DIN rail?

Disclaimer:

Johnson Controls is a registered trademark of Johnson Controls International. This product description is for informational purposes only and is not affiliated with or endorsed by Johnson Controls. Always verify product compatibility before purchase.

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