Electronic Room Thermostat
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TCN-890x Electronic Room Thermostats
The TCN-8900 Series is a family of analog electronic controllers designed to control heating and/or cooling valves or dampers. The TCN-8901 has two 0 to 10 VDC proportional outputs, one for heating and one for cooling. The TCN-8906 has two On/Off triac outputs, one for heating and one for cooling, capable of switching 0.5 A at 24 VAC. The dual-scale setpoint dial enables the room occupant to adjust the thermostat setpoint within the range of 54 to 82°F (12 to 28°C).
Features and Benefits
IMPORTANT: The TCN-8900 Series electronic room thermostats are intended to control equipment under normal operating conditions. Where failure or malfunction of the thermostat could lead to an abnormal operating condition that could cause personal injury or damage to the equipment or other property, other devices (limit or safety controls) or systems (alarm or supervisory) intended to warn of, or protect against, failure or malfunction of the thermostat must be incorporated into and maintained as part of the control system.
The TCN-890x features a quick-mount design that saves time and simplifies installation. Two bases and screws are provided with each thermostat, so it can be mounted directly to drywall (plastic wall anchors are provided) or a standard U.S. wallbox. The setpoint knob has scales both in Fahrenheit (54 to 82°F) and Celsius (12 to 28°C). The TCN-8900 Series features separate Reverse Acting/Direct Acting (RA/DA) outputs for heating and cooling applications. To change the output from heating to cooling, connect an external changeover to the provided inputs on the screw terminals.
TCN-8900 Series models include an adjustable Dead Band (DB).
• TCN-8901 has 0 to 10 VDC RA and DA outputs that feature separate Proportional Band (PB) adjustments.
• TCN-8906 has two On/Off RA and DA triac outputs that feature separate differential adjustments.
Use the Unoccupied feature, accessible through the terminal block, to designate a night or unoccupied setting, which can be operated by a timer or other device. This state provides thermal protection by maintaining a fixed offset of 9F° (5C°) from the setpoint temperature.
Replaces Part Numbers: TCN-8906-2161