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1) Maintenance of fan :
One week after the unit is running, the elastic belt should be
re-adjusted, and should be inspected once every three months in
accordance with the requirements of inspection.
2) Maintenance of belt and pulley :
When the unit is running, check tension of the belt in a regular
time. Do the inspection job according to requirements of inspection
Tension adjustment of the belt: If the belt tension is proper, it will
help to avoid fan vibration, reduce noise and belt abrasion.
Customers should check belt tension every week and do
adjustment according to the following procedures if necessary:
a. Loosen the 4 fixed bolts of motor. Tighten or loosen the bolts
to move the motor.
b. Act in the middle of the belt perpendicularly with a finger.
Adjust belt tension until there's deflection distance, please refer to
Fig 3-2 If possible, it is better to use a tension frequency test
device, in order to get a more precise tension.
c. Tighten the fixed bolt of motor again.
Pulley revise: Fan pulley and motor pulley should on the same
plane, or it will consume much more energy and curtail service
life of belt. Every time after belt adjustment, you should check if
positions of the 2 pulleys are correct, refer to figure 3-3, you can
put a ruler on the same side of 2 pulleys to check if positions of 2
pulleys are correct. Check if point 1, point 2, point 3 and point 4
are in the same plane. If not, you can loosen fixed screws of fan
pulleys and along the fan axle to slide fan pulleys. Loosen motor
to adjust the angle on the fan slide way. Adjust to straightness≤
2mm.
3) When the unit is not running and heating system is not run-time in
the winter, the water must be drained out the coil (system) or add
the appropriate concentration antifreeze, otherwise the coil will be
frost crack.
4) Filter should be cleaned by using water or detergents depending
on the degree of dirt, cleaning frequency according to the using
environment, it is recommended a regular once a month.
5) For the units with humidifier, ECSE etc. special functions, pay
attention to read the components operation instructions along with
the unit, and do periodic check as the instructions.
6) A comprehensive maintenance should be taken every two years.
Chemical methods can be used to remove the scale in the coil, and
water or detergent can be used to clean the dirt on the surface of
the coil. Pay attention to check the water pipeline and wind duct for
sealing and insulation in order to reduce energy loss.
NOTE
1. Straightness requirements and tension requirements should be
satisfied at the same time after adjusting belt and pulleys.
2. When the service time has reached to 24 hours for the newly used
belt, you must check belt tension and adjust it properly. Improper
adjustment or no adjustment may result in belt lifespan reduction.
Even more it will cause belt fracture.
3. Belt is consumable. It is normal when after 6-months usage, the
belt is abraded and lose efficacy. You need to change a new belt at
this time. If multi-belts rotate, you should change the group of belts
simultaneously.
8 PHENOMENA NOT ATTRIBUTABLE TO
FAULTS OF AIR CONDITIONER
The following phenomena do not indicate exception of air
conditioner
The system does not run.
After pressing the ON/OFF button, the system does not run
immediately.
If the RUN indicator is on, it indicates the air conditioner runs in
the normal status.
It does not run immediately because the safety device in the
system is active to prevent overload.
Three minutes later, the air conditioner compressor will run
automatically.
If the RUN indicator and the Defrost/Preheat indicator are on, it
indicates you have selected the heating mode. At the beginning
after startup, since the compressor does not run, the tempera-
ture of the indoor unit is too low. See the chapter headed
"Cooling/Heating/Supply Air Operation Procedure".
The indoor unit gives out white aerosol
This phenomenon may occur when the indoor relative humidity
is too high and the unit runs in the cooling mode (in a place
where there is much oil mist or dust).
If the internal stain of the indoor unit is heavy, the temperature in
the room will be distributed unevenly. In this case, the interior of
the indoor unit must be cleaned.
Contact the local distributor or the aftersales service center of
manfacturer to inquire about the methods of cleaning the indoor
unit. This job must be performed by professional maintainers.
This phenomenon may also occur when the air conditioner
shifts from defrosting operation to heating operation.
That is because the moist generated by defrosting is expelled as
steam.
Noise of air conditioner
When the air conditioner runs in the cooling, dewetting or
heating mode automatically, grave continuous sizzles may
occur.
That is the sound of flow of refrigerant between the indoor unit
and the outdoor unit.
The sizzles may be heard shortly after the unit stops running or
when the unit runs in the defrost mode. That is the sound raised
because the refrigerant stops flowing or changes the volume of
flow.
Squeak may occur when the air conditioner starts or stops
running. That is the sound raised because the plastic assem-
blies inflate or deflate when the temperature changes.
Dust is blown out of the indoor unit.
When the air conditioner resumes service after a long period out
of service, the dust in the indoor unit will be blown out.
The indoor gives out smell
The indoor unit absorbs the smell of the room, furniture or
smoking, and gives it out when running.
Shift from cooling mode to air supply mode.
owner's manual
5
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