Panasonic U-16MF2E8 Service Manual

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3WAY SYSTEM

Outdoor Unit Repair Procedures

2 - 14

7. Charging Compressor Oil

(DPR : CV6230817937)

Nipple

Packless valve

(Receiver-tank:

CV6380152988)

Fig. 8

7-1. If Refrigerant Has Already Been Charged to Outdoor Unit

Be sure to use an exclusive oil-charging tank for charging compressor oil. Prior to charging, carry out vacuum drying

inside the tank and take care that no air (in the form of bubbles) is permitted to enter the tank.

The oil charging procedures are given below.

*The receiver tank used for maintenance may be used as an exclusive oil-charging tank.

When installing the oil-charging

tank to the refrigerant system to

serve as a safety bypass circuit

for refrigerant, connect it to the

gas tube service port carefully to

avoid releasing refrigerant into the

atmosphere.

Perform oil charging

work carefully so that no

liquid refrigerant enters

the charging tank.

CAUTION

(1) Evacuation drying in oil-charging tank

With the lower side valve fully closed, open the upper side valve and connect it to the vacuum pump via the

manifold gauge valves as shown below. Run the vacuum pump and evacuate the tank until the pressure falls to

below –101kPa (–755 mmHg, 5 Torr) for the evacuation drying. After the evacuation drying is finished, fully clos

the upper valve. Next, fully close the manifold gauge valves and stop the vacuum pump.

To ensure proper evacuation, refer to the operating instructions that came with

the vacuum pump.

CAUTION

Fig. 9

(2) Charging compressor oil into oil-charging tank

Connect a piece of pipe to the lower valve and then insert the other end deeply into the bottom of the oil con-

tainer. Make sure you avoid letting any air be sucked into the tube. Next, run the vacuum pump and open the

manifold gauge valves, then open the upper and lower valves to begin charging oil into the charging tank.

Upper side

valve

Lower side

valve

Manifold gauge

Open Close

Lo Hi

Vacuum pump

5/A9#;'%1K5;56'/A5G 

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Questions and Answers:

A
anntranAug 23, 2025
Why is my Panasonic U-16MF2E8 Air Conditioner cooling or heating poorly?

Panasonic U-16MF2E8 Specifications

General

Brand	Panasonic
Model	U-16MF2E8
Category	Air Conditioner
Language	English

(2) Increasing/decreasing the heat exchanger capacity (when the outdoor unit heat exchanger is functioning as a condenser)

(3) Increasing/decreasing the heat exchanger capacity (when the outdoor unit heat exchanger is functioning as an evaporator)

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Panasonic U-16MF2E8 Service Manual

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Questions and Answers:

Panasonic U-16MF2E8 Specifications

Summary

SERVICE MANUAL

3WAY VRF SYSTEM

IMPORTANT! Please Read Before Starting

For safe installation and trouble-free operation, you must:

SPECIAL PRECAUTIONS

When Installing…

Precautions for Installation Using New Refrigerant

1. Care regarding tubing

2. Be sure to recharge the refrigerant only in liquid form.

3. Different tools required

Section 1: CONTROL FUNCTIONS

Section 5. TROUBLE DIAGNOSIS

1. CONTROL FUNCTIONS

2. Selecting Outdoor Unit for Operation

3. Compressor Control

5. Outdoor Fan Control

6. Indoor Units Control from the CCU

7. Tube Refrigerant Recovery Control

8. Oil Control

9. Defrost Control

10. Upper Current Limitation Mode (Demand control)

11. Alarm Information

12. Backup Operation

3. Compressor Control

3-6. Capacity Control (Roadmap control)

3-6-2. Condensation Temperature Adjustment by Roadmap Control

3-6-3. Cooling Operation with Low Ambient Temperature

(2) Increasing/decreasing the heat exchanger capacity (when the outdoor unit heat exchanger is functioning as a condenser)

(3) Increasing/decreasing the heat exchanger capacity (when the outdoor unit heat exchanger is functioning as an evaporator)

3-7. Protection Control

3-7-4. Primary Current Protection of HIC Board

3-2. Compressor Selection Rules

3-3. Delay Start of Each Compressor

3-6-4. Control of Condensation Temperature and Evaporation Temperature during Mixed Cooling/Heating Operation

3-7-1. Compressor discharge temperature protection

3-7-2. Abnormal Low Pressure Protection

3-7-3. Over-current Protection of Compressor

10. Upper Current Limitation Mode (Demand control)

10-1. Demand Control

10-2. Upper Current Limitation Mode

11. Alarm Information

11-1. Discharge Temperature

11-2. Current Protection

11-3. Pressure Sensor Failure

11-4. High Pressure Protection and Low Pressure Protection

11-5. Temperature Sensor Failure

11-6 Magnet Switch Failure

12. Backup Operation

12-1. Automatic Backup Operation

12-1-2. Start of Automatic Backup Operation

12-2. Manual Backup Operation

Backup operation procedure

2. OUTDOOR UNIT REPAIR PROCEDURES

1. Removing Panels

2. Discharging Compressor Oil

3. Backup Operation

4. Recovering Refrigerant

5. Checking for Leakage After Repair

6. Evacuating System

7. Charging Compressor Oil

8. Pumping Out Refrigerant from Outdoor Unit

9. Compressor

2. Discharging Compressor Oil

2-1. Discharging Oil from Oil Separator

2-2. Discharging Oil in Compressor

2-3. Checking the Oil

3. Backup Operation

3-1. Automatic Backup Operation for Compressor

(2) Adjusting the refrigerant for backup operation

3-2. Manual Backup

4. Recovering Refrigerant

4-1. Refrigerant Recovery Procedures (from outdoor unit)

4-2. Refrigerant Recovery Procedures (Indoor Unit)

4-2-2. Refrigerant recovery procedures (1) (using indoor unit ball valve)