37
Test Operation, Troubleshooting and Maintenance
TEST OPERATION, TROUBLESHOOTING AND MAINTENANCE
1 Commissioning
◆
Preparation
Disconnect all power electricity before servicing.
Install control lines and electric lines properly.
Turn on all stop valves.
Remove distributed stuff including scrap metal, line ends and forceps clips.
◆
Steps
Connect power electricity and press the ON/OFF key of the thermostat to turn on the unit.
Press MODE to switch operating modes between Cooling, Heating and Fan and ensure the unit works
well.
2 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.
To Next Page
Loading...
