Cassette Type FCU
20
Maintenance before and after Seasonal Use
Precautions before the Seasonal Use
• Check if the air inlet and outlet are clogged or not?
• Check if the unit is reliably grounded?
• Check if the air lter is installed properly or not?
• When the unit is to be started after it has stopped for
quite long time, power the unit on 6 hours ahead.
Precautions after the Seasonal Use
• Clean the air lter
• Cut off the power supply for the unit.
Cut off the
power supply
4 Troubleshooting
No. Symptoms Possible Causes Corrective Measures
1 The unit does not
run.
There is no power supply.
Repower the unit when power supply
is available.
The power plug is loosened. Tighten the power plug.
The motor is burnt out.
Replace the motor and check for the
wiring
2
There is abnormal
noise.
The volute or blade is deformed, or
the volute contacts the blade.
Replace the volute or the blade.
The air lter is clogged. Clean the lter.
There are foreign matters at the inlet/
outlet or inside the duct.
Remove foreign matters.
There is abnormal noise from the
motor.
Replace the motor.
The fastening screws are loosened. Tighten them.
3
The airow rate is
too low.
The air lter is clogged. Clean the air lter.
There are foreign matters at the return
inlet and air outlet.
Clear foreign matters.
The duct resistance exceeds the
design value.
Lower the duct resistance or reselect
the unit.
4
The cooling or
heating effect is
poor.
The air lter is clogged. Clean the air lter.
The dampers are not opened. Open the dampers.
The ns are clogged or damaged. Clean or repair ns.
The entering water temperature
cooling is too high and too low for
cooling.
Adjust the entering water temperature.
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