MCAC-PDSM-2013-04 Midea Precision AC Technical Manual-Down Delivery Series
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the filter screen clogging switch. The filter screen clogging switch is located in the electric control
box, and collect the large air pressure and filtered air pressure through the white soft hose, and
the filter screen clogging switch to compare the two pressure difference to judge the output.
When installs different type of filter screen, in order to accurately find emergency alarm, it must
install all the panel of the device in places and keep closed. Under the fan is operating, as the
anti-clockwise direction to rotate the setting knob of the filter screen clogging switch, to make the
switch contact the filter alarm, and then as clockwise direction to rotate the 100Pa deviation
pressure, and then install the plastic protective cover of the filter screen clogging switch in place.
Notes:
1. Setting point shall be appropriately, and can not deviate too much, or it will due to dirty filter screen
and cannot trigger the alarm, and then cause the small system air volume and lead to abnormal
operation of the system.
2. To change different type of the filter screen and adjust the setting, it should be confirmed by
manufacture.
7.4 Indoor fan components maintenance
Periodically check the fan components, including: belt, motor frame, fan bearing and impeller. The
motor and installation panel are integration design and use bolts to fix on the installation panel. After
a period of using, it should be check whether the bolts are loosened. If they are loosened, they should
be promptly tightened.
Fan bearing and impeller
It should be regularly check whether the fan and fan spindle are installed firmly or not. Turn the
fan impeller to make sure it cannot clash the scroll shell. Use the bearing of this component is
permanently sealed and self-help lubricated. During regulating the belt, it should be examined
for the attrition phenomenon. Turn the belt pulley to check the rotating condition of the fan
spindle. If it was found to have any big movement, then needs to replace the bearing.
Belt
Use the belt tension meter to detect the tightness of the belt. Or in the connection center of motor
wheel and fan wheel to tight the belt, it should has 1/2’~1’ displacement. If the belt is in damage
or deformation status, use the same type of belt for replacement.
Motor
When the motor appears abnormal sound, burned etc, factors to make invalidation, needs to be
changed, for upper air supply unit. It should pay special attention for safety. It must use special
tools to hold the motor and then dismantle fixed the bolt of motor base.
7.5 Humidifier maintenance
During the normal operation of the humidifier, articles such as mineral salt will gradually deposit and
form scales on the internal wall of the humidifier tank. These scales must be regularly cleared, which
can guarantee the efficient operation of humidifier. Because of different water qualities, the cleaning
time should be based on the local specific situations. It is suggested to check monthly.
Please do not use cleaning agent and solvents to clean the plastic components.
Use materials which contain 20% acetic acid to remove the scales and residue in the water.
