Daikin UAA220-ST3M - Page 38

65 | P a g e
Interval and running time
Check List
After
3
months
After
6
months
After
1
years
After
2
years
After
3
years
After
4
years
After
5
years
After
6
years
After
7
years
After
8
years
After
9
years
After
10
years
After
11
years
After
12
years
After
13
years
After
14
years
After
15
years
Replacement standard
2500
5000
20000
40000
Daily inspection
1. Pressure (Discharge and suction)
2. Oil level (Confirm that oil is present in the oil sight
glass.)
3.Noise (Is any abnormal noise heard?)
4. Check fan breakers (If they trip, find out cause and reset.)
5. Suction superheat and discharge superheat (Suction superheat should be higher than 2 C and discharge superheat should be higher than 10 C .)
Monthly inspection
1. The color of refrigerant oil (New oil is clean. If the oil color shows puce or muddy, it is necessary to change the oil. If the oil color shows black, it is necessary to check the oil filter in
compressor.)
2. Check the liquid level and the color of the sight glass (If the test paper turns yellow, it means that water content in refrigerant is over standard. Normally, there is few bubbles in cooling
mode.)
3. Check leakage in the refrigerant circle (is there oil around the pipes or any noise of leaking?)
4. Check the oil pressure drop (the difference between discharge pressure and oil pressure should be less than 2.5 bar, otherwise it is necessary to check the compressor.)
Compressor
Bearing (Screw)
Replace it if any abnormal operation (sound,
vibration) or debris
particle is found during the inspection.
Bearing (Gate Rotor)
Casing
0
0
0
0
Replace it if any chip, crack or similar is
found during the inspection.
Screw rotor
0
0
0
0
Gate Rotor
0
0
Motor
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Replace it if any insulation resistance is
abnormal during the inspection.
Solenoid valve
0
0
0
0
0
0
0
0
0
0
0
Replace it if any insulation resistance is
abnormal during the inspection.
Oil heater
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Demister (in the oil separator)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Replace it if the differential pressure
exceeds 0.5bar during operation.
Suction strainer
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Oil strainer
0
0
0
0
0
0
0
0
0
0
0
0
Replace it if the differential pressure
exceeds 2.5bar during operation.
Refrigerant oil
0
0
0
0
0
0
0
0
0
0
0
0
Water side
heat
exchanger
Chemical clean
0
0
Replace it if any leakage, heat exchange
pipe broken or the pressure difference more
than 1.5bar at rated volume of water.
Water reversed clean
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Check the pressure difference
between inlet and outlet pipe (at
rated flow, less than 1.0 bar)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Air side
heat
exchanger
Fin (Remove surface dust, and tease
fins, then observer the condition of
corrosion after
removing dust.)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Replace the coil if more than 1/3 of fin or
heat exchange pipe are abnormal.
Heat exchange pipe, header,
distribution pipe x whether exist
broken or flat )
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Braze the broken point.
Fan
Motor, fan insulation resistant, fan
blade distortion )
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Replace motor if any insulation resistance is
abnormal.
Replace fan blade if any distortion.
Unit Maintenance and Inspection