Remote Control In Th-Tune Room - Carrier 39HXC Manual

3 - FEATURES

3.14 - Remote control in Th-Tune room

The Th-Tune (optional) is a room thermostat and is used as a room temperature sensor. It is used to display the unit status (setpoints,
operating status, ventilation status). It is used to modify temperature setpoint 1 and force operation to setpoint 1 or 2.
To connect the Th-Tune to the terminal strip located in the electrics box, refer to the unit's wiring diagram. The procedure is as follows:
- Connect the power supply
- Connect the ModBus connection (Tx+/Tx-)
- If the terminal is more than 100 m away, a 120 Ω ¼W resistor must be installed at the start of the line between terminals J9+ and
J9- of the controller, and at the end of the line between Th-Tune terminals Tx+ and Tx- (see wiring diagram supplied with the
machine).
Symbols
mode
Current cooling / heating control status
Symbols
Current air flow rate setpoint
Symbols
No symbol
Description
Key has no effect
Key has no effect
This key is used to start or shut down the unit
This knob has 2 functions:
- Press: used to alter the setpoint or parameter selected
- Rotation: used to select a setpoint or parameter and modify it (for more information see the "temperature,
setpoint, time" table below)
Description
Current heating control
Current cooling control
Description
Ventilation shut down (unit running, but frost protection or night cooling mode in progress, but fresh air temperature
condition not met)
Flow rate setpoint 2 in progress
Flow rate setpoint 1 in progress
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