Liebert DM Series, Руководство пользователя

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52 Chapter 6 System O&M
DM Series 16kW Air Conditioner User Manual
Power off before replacing the filter. You need to adjust the setting point of the filter clogging switch if the new filter is of
a different model. The filter clogging switch is located in the electric control box. It samples the air pressures before
and behind the filter through a black hose, and decides the output after comparing the two values.
To adjust the setting point of the filter clogging switch, you should:
1. After replacing the filter, restore and seal all the panels, so that the alarm point can be found precisely.
2. Keep the fan running, and rotate the rotary switch of the filter clogging switch counter clockwise until the filter alarm
is triggered.
3. Rotate the rotary switch clockwise for 2.5 rounds, or rotate it according to the new filter
’s model.

Note
1. Set the setting point properly. Otherwise, the filter alarm may be triggered too frequently; or, in the opposite case, the dust
accumulation on the filter could not trigger the alarm, endangering the system operation due to deteriorated ventilation.
2. If you are unsure about the setting point, consult with Emerson before using a filter of a different model to replace the old one.
6.1.4 Fan Kit
The fan components that require regular checking include belt, motor bracket, fan bearing and blades.
The fan and the installation board are designed in consistency. The belt tension is regulated automatically under the
force of gravity, so as to reduce the fan vibration and protect the belt. If you need more details, please contact the
manufacturer.
Fan Bearing And Blades
Check the fan regularly to make sure the bearing is firmly fixed. Rotate the blades and make sure that they do not
scratch the wall of the air duct. Because the bearing is permanently sealed and self-lubricated, check for signs of
wearing when adjusting the belt. Roll the belt and observe the motion of the fan bearing. If any abnormal displacement
is observed, replace the bearing.
Belt
Measure the belt tension with a tension meter. You can also press down the belt at the middle point between the two
pulleys. The displacement should be 0.5
” ~ 1”.
If the belt is found worn out or distorted, replace it with a new belt. The new belt should be of the same model as the
old one.
Motor
To replace the failed motor, you need to be very careful, especially with the upflow unit. Use a dedicated fixture to hold
the motor before removing the fixing bolts at the bottom of the motor.
6.1.5 Infrared Humidifier
During the normal operation of the humidifier, sediment will accumulate on the water pan. To ensure efficient operation
of the humidifier, you need to clean the sediment regularly. However, the cleansing cycle varies because the water is
different in different regions. It is recommended to check, and cleanse (when necessary) the water pan, once a month.
Remove the water level regulator to drain the water pan. Disconnect the drainage pipe, remove the dry-burning
protection switch of the water pan, remove the fixing screws at the two ends of the pan, and pull out the water pan.
Cleanse the water pan with water and hard brush, and restore the water pan by reversing the preceding procedures.

Note
Before removing the water pan, make sure that the power has been cut off, and the water in the water pan is not too hot.
The autoflush function of the humidifier can prolong the cleansing cycle. However, timed check and maintenance are
indispensable.
Replacing the lamps of the humidifier
The lamp of the infrared humidifier is shown in Figure 6-3. Follow the procedures below to replace it.
1. Cut off the main isolation power switch.
2. Unplug all the control lines of the humidifier and cut off the cable ties that binds the humidifier power cables. In the
single-door system, the plugs of the humidifier are sealed in the niche above the lamp, and you need to open the cover