Panasonic U-16MF2E8 Service Manual

3WAY SYSTEM
Outdoor Unit Repair Procedures
2 - 18
2
8. Pumping Out Refrigerant from Outdoor Unit
The hoses may be subject to internal pressure from the refrigerant inside the out-
door unit. Check that the manifold gauge valves are fully closed beforehand. A
Schrader-type push-to-release valve is provided at each connection port.
CAUTION
Required equipment and tools: Jumper wire with clips, adjustable wrench, set of manifold gauge valves for the
refrigerant R410A, refrigerant recovery unit, pre-purged refrigerant cylinder for
recovery, flathead screwdriver, and outdoor unit maintenance remote controller.
This work is performed in order to collect the refrigerant from an outdoor unit where repairs (other than compressor
replacement) will be performed into other outdoor units and indoor units, and the refrigerant tubing.
8-1. If Remote Controller (CZ-RTC2) is Used for Maintenance of Outdoor Unit
(1) Refer to “3. Backup Operation” and perform backup operation.
(2) Connect the manifold gauge valves at the Lo side to the low-pressure outlet port of the outdoor unit to be
repaired. Also connect the refrigerant recovery cylinder to any one of the normal outdoor units at the liquid
line service port (Schrader-type push-to-release valve). Perform the connection work quickly so that no air is
allowed to enter. (Fig. 14)
* Connecting the refrigerant recovery cylinder is done to prevent pressure from rising excessively during backup
operation by recovering the refrigerant from the outdoor unit to be repaired.
(Measure the weight of the refrigerant and cylinder itself beforehand and provide sufficient safety measures,
such as installing a high-pressure cutout in the circuit.)
(3) Connect the outdoor unit maintenance remote controller to the RC connector (CN73) (3P) (BLU) on the out-
door unit control PCB of the outdoor unit to be repaired. Then start a test run of all units. (Press and hold the
(CHECK) button for 4 seconds or longer.)
(4) Use the outdoor unit maintenance remote controller to check the operating status of the indoor units. Check
that all units are operating in Heating mode. For details concerning operation of the outdoor unit maintenance
remote controller, refer to the “Outdoor unit maintenance remote controller” item. It is also possible to check the
operating conditions either in cooling or heating mode by touching the gas tube.
Cooling mode: low temperature (20or lower)
Heating mode: high temperature (60 or higher)
The gas tubing becomes hot (60°C or higher) in heating. Be careful so as not to be
burnt when touching the tubing.
CAUTION
(5) Close the suction tube and balance tube on the outdoor unit to be repaired. Then slowly close the liquid tube
service valve.
(6) When the low pressure at the outdoor unit to be repaired reaches 0.5 MPa or below, press the ON/OFF button
on the outdoor unit maintenance remote controller to stop all the units. Then immediately fully close the gas
tube valve on that outdoor unit.
While closing the valves, the rise in discharge temperature or another factor may
cause a protective device to activate, stopping the operation of the outdoor unit. If this
occurs, immediately fully close the gas tube valve on the outdoor unit to be repaired.
CAUTION
(7) Connect the high-pressure gauge side of the manifold gauge to the high-pressure outlet port on the outdoor
unit to be repaired, and connect the manifold gauge to the refrigerant recovery device. Be sure that no air enters
the tubing at this time.
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Panasonic U-16MF2E8 Specifications

General

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

Summary

SERVICE MANUAL

3WAY VRF SYSTEM

IMPORTANT! Please Read Before Starting

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

SPECIAL PRECAUTIONS

Critical warnings and precautions for installation, wiring, and handling.

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

Detailed explanation of compressor control methods and operations.

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

Information regarding system alarms and error codes.

12. Backup Operation

Functions for automatic and manual backup operation during failures.

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

Protective control mechanisms for compressors.

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

Information on discharge temperature protection and related alarms.

11-2. Current Protection

Information on alarms related to current protection.

11-3. Pressure Sensor Failure

Information on high and low-pressure sensor failures.

11-4. High Pressure Protection and Low Pressure Protection

Protection mechanisms and alarms for abnormal high and low pressures.

11-5. Temperature Sensor Failure

Alarms and troubleshooting for temperature sensor failures.

11-6 Magnet Switch Failure

Troubleshooting magnet switch failures and their operational impact.

12. Backup Operation

12-1. Automatic Backup Operation

Function and engagement of automatic backup operation.

12-1-2. Start of Automatic Backup Operation

12-2. Manual Backup Operation

Procedures for performing manual backup operation.

Backup operation procedure

2. OUTDOOR UNIT REPAIR PROCEDURES

1. Removing Panels

2. Discharging Compressor Oil

Steps for safely discharging compressor oil.

3. Backup Operation

Procedures for operating the system in backup mode.

4. Recovering Refrigerant

Steps for recovering refrigerant from the system.

5. Checking for Leakage After Repair

Methods for checking for refrigerant leaks after repair work.

6. Evacuating System

Procedure for evacuating the refrigerant system.

7. Charging Compressor Oil

Steps for charging compressor oil into the system.

8. Pumping Out Refrigerant from Outdoor Unit

Procedure for pumping out refrigerant from an outdoor unit.

9. Compressor

Information and procedures related to compressor maintenance and replacement.

2. Discharging Compressor Oil

2-1. Discharging Oil from Oil Separator

Procedure for discharging oil from the oil separator.

2-2. Discharging Oil in Compressor

Procedure for discharging oil directly from the compressor.

2-3. Checking the Oil

Criteria for accepting or rejecting discharged compressor oil.

3. Backup Operation

3-1. Automatic Backup Operation for Compressor

Details on automatic backup operation for compressors.

(2) Adjusting the refrigerant for backup operation

Procedure for adjusting refrigerant levels during backup operation.

3-2. Manual Backup

Procedures for manual backup operation.

4. Recovering Refrigerant

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

Step-by-step guide for recovering refrigerant from an outdoor unit.

4-2. Refrigerant Recovery Procedures (Indoor Unit)

Procedures for recovering refrigerant from indoor units.

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

Refrigerant recovery process using an indoor unit ball valve.

4-2-3. Refrigerant recovery procedures (2): Indoor unit with no ball valve equipped

Refrigerant recovery steps for indoor units without ball valves.

4-3. Recovery of Refrigerant from Entire System

Procedure for recovering refrigerant from the entire system.

5. Checking for Leakage After Repair

5-1. Pressure Check for Leakage of Outdoor Unit

Performing a pressure check to detect leaks in the outdoor unit.

6. Evacuating System

6-1. Evacuating Repaired Outdoor Unit

Procedure for evacuating gases from a repaired outdoor unit.

7. Charging Compressor Oil

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

Procedure for charging compressor oil when refrigerant is already present.

(3) Charging compressor oil into outdoor unit

Steps for charging compressor oil into the outdoor unit.

7-2. If Outdoor Unit Has Not Been Charged with Refrigerant

Procedure when outdoor unit has not been charged with refrigerant or compressor.

7-3. Charging Additional Compressor Oil (after replacing compressor)

Procedure for charging additional compressor oil after replacement.

8. Pumping Out Refrigerant from Outdoor Unit

8-1. If Remote Controller (CZ-RTC2) is Used for Maintenance of Outdoor Unit

Procedure for pumping out refrigerant using the CZ-RTC2 remote controller.

8-2. If Remote Controller is Not Available for maintenance of Outdoor Unit

Procedure for pumping out refrigerant without the remote controller.

(9) Close the gas tube and balance tube...

Final steps for pumping out refrigerant from an outdoor unit.

9. Compressor

9-1. Compressor Trouble Diagnosis and Check Methods

Methods for diagnosing compressor troubles and checking components.

9-2. Replacing the Compressor(s)

Procedures for replacing compressors.

9-2-2. Replacing all compressors in a failed unit

Procedure to replace all compressors in a failed unit.

9-2-3. Replacing all compressors in a system

Procedure to replace all compressors across the entire system.

9-2-4. Dry core cleaning

Procedure for dry core cleaning to remove contaminants.

(B) If a ball valve is not installed on the outdoor unit

Dry core cleaning steps when no ball valve is installed on the outdoor unit.

9-3. Removing Compressors

Procedure for removing compressors from the unit.

9-3-2. Removing Constant-Speed Compressors (for 12, 14 and 16 horse power models)

Specific steps for removing constant-speed compressors.

9-2-1. Replacing only the failed compressor

Steps to replace a single failed compressor.

4. REMOTE CONTROLLER FUNCTIONS

1. Simple Settings Function

2. Detailed Settings Function

3. Remote Controller Servicing Functions

5. TROUBLE DIAGNOSIS

1. Contents of Remote Controller Switch Alarm Display

Overview of alarm codes displayed on the remote controller.

2. Outdoor Unit Control Panel LED Display

Understanding the LED indicators on the outdoor unit control panel.

3. Remote Controller Servicing Functions

4. 3WAY Alarm Codes

List and explanation of specific 3WAY system alarm codes.

5. Blinking Inspection Display

6. Inspection of Parts

8. Symptom: Thermostat in OFF continues or cycles OFF & ON too frequently

Diagnosing and resolving symptoms related to thermostat cycling.

1. Contents of Remote Controller Switch Alarm Display

Possible cause of malfunction

4. 3WAY Alarm Codes

E06 Alarm

Details and troubleshooting for E06 alarm.

E16 Alarm

Details and troubleshooting for E16 alarm.

E25 Alarm

Details and troubleshooting for E25 alarm.

F04, F05 Alarm

Troubleshooting for F04 and F05 discharge temperature sensor alarms.

F06, F23 Alarm

Troubleshooting for F06 and F23 gas temperature sensor alarms.

F08 Alarm

Troubleshooting for F08 outdoor air temperature sensor alarm.

F16 Alarm

Troubleshooting for F16 high-pressure sensor malfunction alarm.

F17 Alarm

Troubleshooting for F17 low-pressure sensor trouble alarm.

H11, H12 Alarm

Troubleshooting for H11/H12 constant speed compressor overcurrent/lock alarms.

H03, H13 Alarm

Troubleshooting for H03/H13 compressor CT sensor alarms.

H06 Alarm

Troubleshooting for H06 abnormal low-pressure alarm.

H08, H27 Alarm

Troubleshooting for H08/H27 oil sensor connection alarms.

L10 Alarm

Troubleshooting for L10 outdoor unit capacity not set alarm.

L17 Alarm

Troubleshooting for L17 outdoor unit model mismatch alarm.

P03, P17 Alarm

P04 Alarm

P14 Alarm

P22 Alarm

E12 Alarm

Details and troubleshooting for E12 alarm.

E20 Alarm

Details and troubleshooting for E20 alarm.

E26 Alarm

Details and troubleshooting for E26 alarm.

F07, F24 Alarm

Troubleshooting for F07 and F24 liquid temperature sensor alarms.

F12 Alarm

Troubleshooting for F12 compressor intake temperature sensor alarm.

H05, H15 Alarm

Troubleshooting for H05/H15 discharge temperature sensor alarms.

H31 Alarm

Troubleshooting for H31 HIC trouble alarm.

L11 Alarm

Troubleshooting for L11 solenoid valve kit installation failure alarm.

P02 Alarm

P05 Alarm

P16 Alarm

P29 Alarm

E15 Alarm

Details and troubleshooting for E15 alarm.

E24 Alarm

Details and troubleshooting for E24 alarm.

E29 Alarm

Details and troubleshooting for E29 alarm.

F14 Alarm

Troubleshooting for F14 SCG temperature sensor alarm.

H01 Alarm

Troubleshooting for H01 compressor 1 current trouble alarm.

L04 Alarm

Troubleshooting for L04 outdoor system address duplication alarm.

E31 Alarm

Details and troubleshooting for E31 alarm.

5. Blinking Inspection Display

Blinking inspection display (1) (Automatic backup)

Blinking inspection display (2) (compressor magnet SW seizing detection)

8. Symptom: Thermostat in OFF continues or cycles OFF & ON too frequently

1. How to detect abnormality

2. Error Diagnosis