Johnson Controls A421GBF-02C A421 Series Low-Voltage Type 1 Electronic Temperature Control with A99Bb-200C Temperature Sensor

Electronic Single Stage

Delivering comfort and convenience, a Johnson Controls temperature control will help you maintain a desired indoor temperature throughout your facility. This temperature control maintains temperature to within one degree of the set point, providing optimal energy efficiency. An electronic single stage model is designed for systems with large capacities and is ideal for comfort cooling applications in lower temperatures with high humidity conditions. The A421 Series features a low voltage input, microprocessor control board, power display, scroll wheel operation, and one-piece stainless steel front mounting bracket.

The A421GBF-02C is the perfect addition to the A421 Series. It features a reliable, economical, and accessible single stage electrically heated valve rough-in for multiple applications.

The A421GBF is a single stage controller that allows for accurate control of temperature applications.

The A421 temperature control's gas valve comes factory installed. The temperature sensor has an A diameter of 0.2", B diameter of 2.3", and T length of 8".

This single-stage unit is designed for small and mid-size commercial and industrial heating and cooling systems. The A421 Series uses a standard sensing element that provides short-term temperature control while the on-board microprocessor electronics continuously monitors and adjusts the output to maintain long term set point.

A421 Series Temperature Controls provide a rugged, economical solution for maintaining a specified temperature. The microprocessor-based control monitors the ambient temperature and the output of the heater to maintain user-defined temperatures.

The A421 low voltage type 1 temperature control is designed to be integral with Johnson Controls A/B/C Recessed Individual Lighting System. The lighting system consists of an individual luminaire – a light source, a reflector and a lens – which has been incorporated into a ceiling plane and housed in a metal cover.

This this low voltage model is designed to be compatible with 2 stage gas furnaces that require this type of operating thermostat. This thermostat features an additional terminal for interfacing to the collector air temperature control (CAT) system.

Anticipate energy efficiency, excellent performance and reliability with the A421 Low Voltage Type 1 Temperature Control. Its advanced digital technology provides better control, even in sub-zero conditions. The innovative microprocessor-based control offers rapid response time to real-world changes in conditions, ensuring precision temperature regulation for optimal comfort and energy savings.

The A421 transformer is an economical, variable voltage, hi/lo temperature control that provides the capability to maintain the temperature of hydrocarbon refrigerants in air conditioning and hydrocarbon refrigerant in heat pump (reverse cycle heat pump) systems. These controls are intended for use with gaseous refrigerants compatible with copper alloys. Selection of the correct control for your application is critical to ensuring long life and proper functioning of your system.

The Johnson Controls A421 low-voltage system has been designed for safe, multi-stage control of heating, ventilation and air conditioning systems. This product ensures optimum comfort because the temperature is continually monitored by an electronic type 1 thermocouple.

The Johnson Controls A421GBF-02C temperature control is designed for use in residential type heating and air conditioning systems. It can be used with forced air furnaces, heat pumps, rooftop units, packaged terminal units, portable DTS units, and water heaters DTS units with a gas or oil fired ignition system.