LG 100K Installation Manual page 8

INSTALLATION OF UNIT
8
• Fan Installation and Adjustment
The fan rotating rate is subject to the air volume required by the units, the unit components and
the resistance in return air pipe. Based on the demanded air volume and the total static pres-
sure, according to the performance curve, you can make out the fan-rotating rate. With the ro-
tating rates of fans and motors, you will know to use what kind of belt pulleys.The fan-rotating
rate can be adjusted by changing belts or pulleys. This will change the indoor unit's air volume
and residual pressure. To replace belts and pulleys on site, please see the following picture and
nd their correct positions.
A
• Belt Adjustment
If the belt is not tight enough, the friction between belt and pulleys may become weak and can
hardly drive the fan to rotate. As a result, the air volume and residual pressure will become in-
sufficient, and unit performance will be affected seriously. However, if the belt is too tight, the
fan or the motor bearings will be worn out more quickly, and the fan or the motor will have
lower performance and shorter operating life. Too loose or too tight belts are harmful to the
units and will make the noise louder. Readjust the belt tension after a week of trial operation.
And then, check the belt every 1 or 2 months to ensure that the tension is suitable. Otherwise,
make some adjustment or replace the belt. When use a new belt, in the first 24 hours of opera-
tion, check its tension at least twice.
• Safety
The installation and maintenance of the air conditioning system should be performed by well-
trained professionals. Regular maintenance, such as coil and air filter cleaning, is necessary for
a normal operation of the units.
Use ruler on site
B
Four key ways
C D