TC303 thermostat parameter 2 setting and energy saving mode operation

Issue

TC303 thermostat parameter 2 setting and energy saving mode operation

Product Line

Field Devices

Environment

TC303-3A2DLMS
TC303-3A4DLMS

Cause

The TC-303 parameter 2 setting is used to configure the fan operation status (fan on or fan off) after the temperature setpoint is reached. 
In the datasheet, it indicates that when the energy saving mode is activated, the fan will run at low speed. The datasheet does not mention what will happen if parameter 2 is set to fan off and energy saving mode is activated. 

Resolution

Test results:

If parameter 2 is set to fan off when temperature is reached, the fan will turn off when energy saving mode is activated. Below is the test result in cooling mode. 
 
1. Parameter 2 set to 00 (fan off when temperature is reached)
Room temperature 24.0'C / Setpoint 20'C
Enable energy saving mode - fan turns off
 
2. Parameter 2 set to 01 (fan on when temperature is reached)
Room temperature 24.0'C / Setpoint 20'C
Enable energy saving mode - fan continues to run. 
If parameter 2 is set to fan off when temperature is reached, the fan will off when in energy saving mode when the temperature is reached. See below for test results in cooling mode.
 
1. Parameter 2 set to 00 (fan off when temperature is reached)
Room temperature 24.0'CSetpoint 20'C
Enable energy saving mode - fan turns off
 
2. Parameter 2 set to 01 (fan on when temperature is reached)
Room temperature 24.0'CSetpoint 20'C
Enable energy saving mode - fan continues to run. 
If parameter 2 is set to fan off when temperature is reached, the fan will off when in energy saving mode when the temperature is reached. See below for test results in cooling mode.
 
1. Parameter 2 set to 00 (fan off when temperature is reached)
Room temperature 24.0'CSetpoint 20'C
Enable energy saving mode - fan turns off
 
2. Parameter 2 set to 01 (fan on when temperature is reached)
Room temperature 24.0'CSetpoint 20'C
Enable energy saving mode - fan continues to run.