Assembly air conditioner AHU Maintenance
1. Fan drive system
When the unit is running, always pay attention to whether the fan is running well, and regularly check the tightness of the belt and the condition of the bearing.
(1) Belt tension adjustment: Proper belt tension is extremely important to prevent fan vibration, reduce belt wear and reduce noise. The user should check the belt tension weekly and make necessary adjustments according to the following steps according to the situation:
a. Loosen the 4 fixing bolts of the motor, and tighten/ loosen the adjusting bolts to move the motor;
b. Use a finger to act on the middle section of the belt in a direction perpendicular to the belt, adjust the tension of the belt to produce the corresponding deflection distance (see Figure 11-belt pulley calibration and belt tension diagram);
c. Retighten the fixing bolts of the motor.
(2) Pulley correction: The fan pulley and the motor pulley should be placed on the same plane, otherwise it will cause excessive energy loss and shorten the life of the belt. After each adjustment of the belt, check whether the position of the two pulleys is correct. As shown in Figure 11, use a ruler on the same side of the two pulleys to check the linearity. If it is not correct, loosen the fan pulley fixing screw and slide the fan pulley along the fan shaft, and adjust by loosening the motor on the motor chassis. Angle, adjust to straightness ≤ 2mm.
