Panasonic U-72MF2U9 Service Manual page 82

7. Charging Compressor Oil
7. Charging Compressor Oil
7-2. If Outdoor Unit Has Not Been Charged with Refrigerant
When a compressor has been replaced or in any other case where the outdoor unit has not been charged with
refrigerant, first charge with refrigerant then follow the instructions in "7-1. If Refrigerant Has Already Been
Charged to Outdoor Unit" and charge with oil.
Or, alternatively, follow the procedure below.
(1) Connect a tube to the oil outlet port on the outdoor unit to be charged with oil. Insert the other end of the tube
into the oil container.
(2) Follow the instructions in "6. Evacuating System," and apply vacuum to the outdoor unit to be charged with oil.
When this is done, oil is charged into the outdoor unit through the oil outlet port.
(3) When the unit has been charged with the designated amount of oil, stop the vacuum pump.
CAUTION
1
2
3
Vacuum pump
4
7-3. If Outdoor Unit Has Not Been Charged with Refrigerant
The rated amount of oil is pre-charged in the compressors as given below:
5
Model name
U-72MF2U9
U-96MF2U9
6
U-120MF2U9
U-144MF2U9
When replacing a faulty compressor, be sure to first measure the amount of remaining oil in the compressor.
7
Charge additional new oil equal to the difference in the remaining oil and the rated amount as listed above.
For example: Type of replaced compressor: C-9RVN393H0M
Remaining oil in the removed compressor: 0.581 gal (2.2 liter)
Additional oil to be charged:
8
* If the result is a negative amount (remaining oil in the removed compressor is less than the rated amount), it is
not necessary to discharge the extra oil from the system.
For the method used for additional oil charging after compressor replacement, see "7-1. If Refrigerant Has
Already Been Charged to Outdoor Unit".
9
The oil absorbs moisture readily. This work must be completed quickly.
Type: 72, 96
Low-pressure outlet port
(for ø5/16" (ø7.94mm)-
dia connector)
High-pressure outlet port
(for ø5/16" (ø7.94mm)-
dia connector)
Manifold
gauge
Lo Hi
Oil
Compressor model Q'ty
C-9RVN393H0M 1
C-9RVN393H0N 1
C-9RVN393H0M 1
2
C-9RVN393H0M 1
C-9RVN393H0M 1
2
C-9RVN393H0M 1
Remaining oil in the removed compressor – rated oil amount
= 0.581 gal - 0.502 gal (= 2.2 liter - 1.9 liter)
=0.079 gal (0.3 liter)
Pre-charged amount of oil (liter)
gallon liter
0.502 1.9
0.502 1.9
0.502
1.9
0.502 1.9
0.502 1.9
0.502 1.9
2 - 18
2WAY VRF SYSTEM
3WAY VRF SYSTEM
Outdoor Unit Repair Procedures
Outdoor Unit Repair Procedures
Oil balance tube service port
(For ø5/16" (ø7.94mm)-
dia connector)
Liquid tube service port
(for ø5/16" (ø7.94mm)-
dia connector)
Discharge tube service port
(for ø5/16" (ø7.94mm)-
dia connector)
Suction tube service port
(for ø5/16" (ø7.94mm)-
dia connector)
Fig. 13