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Model
U-4LE1E5 U-4LE1E8 U-5LE1E5 U-5LE1E8 U-6LE1E5 U-6LE1E8 S-15M S-22M S-28M S-36M S-45M S-60M S-73M S-90M S-106M S-140M S-160M
Pages
127
Size
7.63 MB
Type
PDF
Document
Service Manual
Brand
Device
Air Conditioner / MINI VRF SYSTEM
File
u-4le1e5-u-4le1e8-u-5le1e5-u-5le1e8-u-6le1e5-u-6le.pdf
Date
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Panasonic U-4LE1E5 / U-4LE1E8 / U-5LE1E5 / U-5LE1E8 / U-6LE1E5 / U-6LE1E8 / S-15M / S-22M / S-28M / S-36M / S-45M / S-60M / S-73M / S-90M / S-106M / S-140M / S-160M Service Manual ▷ View online

2 - 1
2
Mini VRF SYSTEM
Outdoor Unit Repair Procedures
2.  OUTDOOR UNIT REPAIR PROCEDURES
Layout Diagram: Sensors and solenoid valves  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
1.  Removing Panels  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.  Discharging Oil in Compressor  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
3.  Recovering Refrigerant  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
4.  Checking for Leakage After Repair  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
5.  Evacuating System  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
6.  Pumping Out Refrigerant from Outdoor Unit  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
7.  Compressor   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
8.  High Pressure Sensor   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17
Contents
SM830195-03_Mini VRF SYS.indb   1
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2014/09/04   18:19:50
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2 - 2
2
Mini VRF SYSTEM
Outdoor Unit Repair Procedures
Layout Diagram: Sensors and solenoid valves
TS
(suction thermistor)
MOV
(electronic 
motor-operated 
valve)
20S
(4-way valve)
C1
(condenser 1 thermistor)
Front side
Front side
SM830195-03_Mini VRF SYS.indb   2
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2 - 3
2
Mini VRF SYSTEM
Outdoor Unit Repair Procedures
1. Removing Panels
Front panel
Cover A
• Remove the front panel (remove 3 screws).
(1) Front panel removal (Fig. 2-1)
(2) Cover A removal (Fig. 2- 1)
• Remove the cover A (remove 1 screw).
Fig. 2-1
SM830195-03_Mini VRF SYS.indb   3
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2 - 4
2
Mini VRF SYSTEM
Outdoor Unit Repair Procedures
Condition of
refrigeration cycle
Recover the refrigerant in the outdoor unit following the procedures in “3. Recovering Refrigerant.” Remove the
compressor and discharge the oil in it. Refer to “8. Compressor” for detailed procedures.  
2-1. Checking the Oil
Acceptance/rejection criteria for the oil
* It is difficult to measure the total acid value in the field, therefore oil hue and odor are the rule of thumb. Checking
   for carbon deposits and abrasive metal powder can additionally be used to assess the system condition.
Condition of oil
Odor
Color
Judgment criteria for changing oil*
Hue
Total acid value
0.02 or less
3.5 or less
4.0 or over
0.06 or over
Smells some what
(not as strong as below)
Pungent / burnt odor
Brownish
Brownish /
blackish
Motor burnout
Abnormal overheat-
operation
Normal
Changing the oil and system cleaning
with dry-cores are necessary.
Changing the oil and system cleaning
with dry-cores are necessary.
Yellowish
None
2. Discharging Oil in Compressor
SM830195-03_Mini VRF SYS.indb   4
SM830195-03_Mini VRF SYS.indb   4
2014/09/04   18:20:08
2014/09/04   18:20:08
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