Replacing a T/H Sensor

Prerequisites

• A T/H sensor needs to be replaced.
• A spare T/H sensor of the same model is available and functional.

Context

The T/H sensor can be maintained only from the rear.

Procedure

1. Tap Shutdown on the home screen of the controller. Turn off the active power switch QF1 and standby power switch QF2 (you do not need to turn on the standby switch QF2 for the model with a single power supply), and drive switch QF3.

   Exercise caution because the device is still energized after it is shut down on the controller home screen.

2. Open the rear door and remove the air filter.
3. Disconnect cables from the RS485_IN and RS485_OUT ports on the T/H sensor, as shown by (1) in Figure 6-50.
4. Pull out the T/H sensor in the direction shown by (2) in Figure 6-50.
   Figure 6-50 Removing a T/H sensor
   

   Before installing a new T/H sensor, check that the DIP switch setting is consistent with that for the original T/H sensor.

5. Connect cables to the RS485_IN and RS485_OUT ports, and install a new T/H sensor in the original position.
   Figure 6-51 Installing a T/H sensor
   

6. Install the air filter and close the rear door.
7. Power on the device and tap Start on the home screen. Ensure that the smart cooling product is running properly without any alarms.