Daikin ZUWV - Page 41

SINGLE SCREW CHILLERS IMM
Engineered for Flexibility and Performance 37
Appendix B
Interval
Items
3
Month
s
6
Month
s
1
Year
2
Years
3
Years
4
Years
Later
5
Years
Later
6
Years
Later
7
Years
Later
8
Years
Later
9
Years
Later
10
Years
Later
11
Years
Later
12
Years
Later
13
Years
Later
14
Years
Later
15
Years
Later
Replacing
criteria when
abnormal
Start
2500
5000
8000
20000
40000
Daily Inspection
1. suction and discharge pressure
2. Oil level (check the oil quantity through Oil sight glass)
3. Sound (any abnormal sound exists)
4. Check the motor overload protector (trip or not, reset if any and check the reason of trip)
5. Discharge superheat degree of compressor (The discharge superheat of R22 chiller shall be larger than 10 °C; the discharge superheat of R134a chiller
shall be larger than 5°C and the discharge superheat of R410A chiller shall be larger than 7 °C)
Monthly
Inspection
1. Color of compressor oil (new oil is clean and the dark brown or cloudy oil shall be replaced; the compressor shall be overhauled when the oil turns dark)
2. Check the color of the sight glass on the liquid supply pipe (yellow indicates that the water content of refrigerant is out of limits; Heating : the liquid supply
pipe is filled with refrigerant liquid and has no bubble , Cooling: there has no bubble or little bubble at the normal condition)
3. Check any leakage of the refrigerant circuit (check any oil strain or leakage around the pipeline)
4. Check the differential oil pressure (The difference between high pressure and oil pressure shall not exceed 1.5 bar during operation, or the oil filter shall
be replaced)
Compressor
Bearing
(screw)
○
○
▲
○
○
▲
Running
abnormal
(sound,
vibration)or
Small
fragments
detected
when
checking;
replace seal
assembly
Bearing (Star
wheel)
○
○
▲
○
○
▲
Body
○
○
○
○
○
○
Check the
debris, cracks
or similar
phenomena
found
Screw rotor
○
○
○
○
○
○