Digital Differential Outlet Thermostat for Attic Ventilation

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Model: TD340

$94.99

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Product Update (8/27/2024): The new model TD340 with a two-stage heating & cooling control is now available! Please read the TD340 user manual for details. It replaces the older model TD330.

TD340 model updates:

New control logic. Now support two-stage heating and/or cooling control.
Flexible output sockets configuration.

The TD340 is a temperature controller for heating, ventilating, and air-conditioning (HVAC) controls using an external medium such as air or water. The controller comes with two sensors. The primary sensor (Sensor1) should be placed in the room or close to the object where the temperature needs to be regulated. The auxiliary sensor (Sensor2) should be placed to monitor the temperature of the external medium. The temperature difference between the two sensors can be used as an additional criterion for controlling the power output.

Two independent channels are available, and each channel has its own set temperature. There are two output sockets, one for cooling and one for heating. The controller also offers the flexibility of re-assigning the heating or cooling output to one or both sockets per the user’s setting.

This controller is a plug-and-play controller that requires no wiring. Both the heating and cooling control modes have simple on/off control, similar to a mechanical thermostat but with higher precision due to an adjustable hysteresis band, precise sensors, and digital readouts. An anti-short function is provided for cooling output to protect the compressor from frequently cycling on/off during high-pressure Freon.

Two digital silicon band gap sensors are used. The advantage of this sensor is that it is more reliable in moist environments than thermistor sensors. This digital sensor can also be immersed over extended periods of time. They also have a more uniform accuracy over an entire specified temperature range. Two sensors are interchangeable. One of the sensors has a 12-feet (2 m) cable, which makes it easy to reach the external medium. For customized sensor cable length, please contact us.

Specifications

Temperature Control Range

-50 ~ 105°C, -58 ~ 221°F

Temperature Resolution

0.1°C (between -9.9 ~ 99°C)

1°C (between -50 ~ 10°C and 100 ~ 120°C)

0.1°F (between -9.9 ~ 99.9°F )

1°F (between -58 ~ 10°F and 100 ~ 248°F)

Temperature Accuracy

0.5°C or 0.9°F

Temperature Control Mode

On/Off Control. Heating and Cooling

Temperature Control Output

10A, 120V or 240V AC *

Audio Alarm

High and Low Limit

Sensor Type

Silicon Band Gap Sensor

Sensor Size

0.24" OD. (6.0 mm), 2" Length (50 mm)

Operating Temperature

-20 ~ 50°C (0°F ~ 120°F)

Dimension

3.6'’ x 5.5'’ x 1.8'’ (91 x 140 x 46 mm)

Input Power

85 ~242VAC, 50Hz/60Hz

Sensor1 Cable Length

6 ft (2 m)

Sensor2 Cable Length

12 ft (4 m)

Power Cable Length

3ft (1m)

Warranty

One (1) year limited warranty

Notes:

The controller can display temperature in Celsius or Fahrenheit.
Unlike the PID controllers we sell, this on/off controller will not hold the temperature as tight if the system had a very slow and delayed response. Some temperature overshoot is normal.
Either the heating or the cooling device is limited to 10 Amps. The output voltage is the same as the input voltage. When the controller is plugged into 120V AC, the output will be 120VAC. If the controller is connected to 240 VAC, the output will be 240 VAC also.
The input power plug is a US NEMA 5-15P plug. The output socks are US NEMA 5-15R. Optional input & output travel plug adapters are offered. Please check here for more details.
Refurbished TD330 is limited stock here.
TD330 model updates (compare to TD320):
- Output sockets have been modified to standard US NEMA 5-15 receptacles.
- Sensor connectors have been changed to standard-size 3-pin connectors for easier handling.
- A new parameter, Relay Output Mode, has been added to allow users to re-assigning the heating or cooling output to one or both sockets per the user’s specific application.