6 points of attention for the use of air duct heaters

1. Run for the first time, check the electrical insulation (total insulation should be greater than 1 megohm), if the insulation is too low, it can be preheated with heavy oil for 24 hours before power transmission.

2. Open the inlet and outlet valves and close the bypass valve. After 10 minutes, feel the oil temperature at the outlet before sending electricity. It is forbidden to open the bypass valve when the heater is turned on.