Mitsubishi Electric VL-250CZPVU-R-E Instruction Manual page 20

7. Troubleshooting (continued)
Automatic supply air stop function/Automatic supply air intermittent operation
function
To protect the Heat exchanger from frost, the product runs the Automatic supply air stop operation/
Automatic supply air intermittent operation when the outdoor air temperature is -3 °C or lower.
To prevent frost from adhering to Heat exchanger, the supply air fan is controlled according to the
temperatures below.
Outdoor temperature
Mode
Note
- Preheater (field supply) is recommended to maintain certain supply air and exhaust air.
- When the outdoor air temperature is -15 °C or lower, the supply air fan run to detect the outdoor air
temperature.
- When the outdoor air temperature is -25°C or lower, the supply air fan does not run for the detection of the
outdoor air temperature.
-15 °C or lower
Supply air stop mode
Eng-20
Between -15°C and -3°C
Supply air intermittent operation
-3°C or higher
Continuous operation