3756/20

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3756/20 is a widely used digital thermostat/hygrostast and controller with a variety of applications in the commercial, industrial and residential markets. It is a proven workhorse for a variety of climate control applications, and the 3756/20 thermostat/hygrostast has been a popular choice for many years for its ease of use, user-friendly features, and accurate temperature and humidity sensing. The unit supports manual and automatic operation with adjustable temperature upper/lower setpoints, adjustable humidity upper/lower setpoints, temperature display, and simple control of an external device such as a fan or pump using a relay or solid state analog output.

In commercial applications, the 3756/20 digital thermostat/hygrostast can be used in many ways, including controlling the temperature and/or humidity of classrooms, auditoriums, parking garages, and warehouses. It can also be used to control the temperature of hot and cold food vending machines or provide an alarm in the event of an emergency. In industrial applications, the thermostat can be used to control the temperature of production lines, boilers, or cooling systems. In residential settings, the thermostat can be used to maintain a comfortable temperature in bedrooms, living rooms, and kitchens. It can also be used to control the humidity of bathrooms and basements.

The 3756/20 digital thermostat/hygrostast operates on a 24 volt DC supply, which could be powered from a battery or the AC mains, and features an adjustable range of temperatures and humidity levels with a differential of ±0.2 °F (±0.1 °C). The lower setpoint, upper setpoint and differential are adjusted using three trimpots located on the back of the device. The upper and lower setpoints can also be configured using a terminal block on the front of the device, if desired. The temperature is sensed using an internal thermistor which is accurate to within ±0.2 °F (±0.1 °C). The humidity is sensed using an internal capacitive humidity sensor which is accurate to ±3.5%.

The 3756/20 digital thermostat/hygrostast employs a PID (Proportional-Integral-Derivative) algorithm, which allows the thermostat to maintain the temperature within a set range of ±0.2 °F (±0.1 °C). The unit also includes a "dead band" mode, which can be used to reduce energy consumption by allowing the temperature to vary by a larger amount (i.e.±1.0 °F or ±0.5 °C) and will only start to adjust the setpoint when the temperature has reached the extreme ends of the dead band. The unit can also be programmed to operate in either an automatic mode for continuous control or a manual mode for intermittent control.

The 3756/20 digital thermostat/hygrostast also features an adjustable temperature and humidity control output, allowing it to control an external device such as a fan or pump. This control output is adjustable from 0 to 10 Volts, and is connected to a terminal block on the back of the device. The control output can be set to operate in either a "proportional/integral" or "on/off" mode, allowing the user to select the most appropriate mode for their application. In addition, the 3756/20 thermostat/hygrostast also includes two alarm outputs, which can be used to signal an alarm if the temperature or humidity exceeds a preset upper or lower limit.

To sum up, the 3756/20 digital thermostat/hygrostast is a reliable and user-friendly device which is ideal for a variety of climate control applications. It is simple to install and setup, and provides accurate temperature and humidity sensing with adjustable upper/lower setpoints. The unit also includes an adjustable control output, allowing it to control an external device, and two alarm outputs for signaling an alarm in the event of an emergency.

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