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Panasonic R410A Service Manual

Mini vrf system
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SERVICE MANUAL

Model No.
Outdoor Units
Class
U-36LE1U6
Model Name
U-36LE1U6E*
Refrigerant R410A is used in the outdoor units.
* Salt-Air Damage Resistant Specifications.
Indoor Units
Class
4-Way Cassette
U1
Y1
4-Way Cassette 60×60
1-Way Cassette
D1
S-07MD1U6
Low Silhouette Ducted
F1
S-07MF1U6
Slim Low Static Ducted
M1
S-07MM1U6
High Static Pressure
E1
Ducted
Ceiling
T1
Wall Mounted
K1
S-07MK1U6
Floor Standing
P1
S-07MP1U6
Concealed Floor
R1
S-07MR1U6
Standing
Necessary to install the External Electronic Expansion Valve Kit (Optional:CZ-P56SVK1U).
**
85464849297000
36
52
U-52LE1U6
U-52LE1U6E*
7
9
12
S-12MU1U6
S-12MY1U6
S-09MD1U6
S-12MD1U6
S-09MF1U6
S-12MF1U6
S-15MF1U6
S-09MM1U6
S-12MM1U6
S-15MM1U6
S-12MT1U6
S-09MK1U6
S-12MK1U6
S-09MP1U6
S-12MP1U6
S-15MP1U6
S-09MR1U6
S-12MR1U6
S-15MR1U6
MINI VRF SYSTEM
15
18
19
S-18MU1U6
S-24MU1U6
S-18MY1U6
S-18MF1U6
S-24MF1U6
S-18MM1U6
S-18MT1U6
S-24MT1U6
S-19MS1U6**
S-18MK1U6
S-24MK1U6
S-18MP1U6
S-24MP1U6
S-18MR1U6
S-24MR1U6
24
36
48
S-36MU1U6
S-36MF1U6
S-48MF1U6
S-54MF1U6
S-36ME1U6
S-48ME1U6
SM830197-00
REFERENCE NO.
54

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  Summary of Contents for Panasonic R410A

  • Page 1: Service Manual

    SERVICE MANUAL MINI VRF SYSTEM Model No. Outdoor Units Class U-36LE1U6 U-52LE1U6 Model Name U-36LE1U6E* U-52LE1U6E* Refrigerant R410A is used in the outdoor units. * Salt-Air Damage Resistant Specifications. Indoor Units Class 4-Way Cassette S-12MU1U6 S-18MU1U6 S-24MU1U6 S-36MU1U6 4-Way Cassette 60×60...
  • Page 2: Special Precautions

    Do not supply power to the unit until all wiring and tubing do not mix air except for speci- are completed or reconnected and checked. fied refrigerant (R410A) in refrigeration cycle. It causes • Highly dangerous electrical voltages are used in this capacity down, and risk of system.
  • Page 3: Check Of Density Limit

    Refrigerant Concentration Level (RCL) of 25 pounds limit. per 1,000 cubic feet for R410A refrigerant. The refrigerant (R410A), which is used in the air condition- For additional guidance and precautions related to er, is safe, without the toxicity or combustibility of ammonia,...
  • Page 4: Precautions For Installation Using New Refrigerant

    2. Be sure to recharge the refrigerant only in liquid form. 2-1. Since R410A is a non-azeotrope, recharging the refrigerant in gas form can lower performance and cause defects of the unit.
  • Page 5 Liquid refrigerant should be recharged with the cylinder standing on end as shown. Liquid New refrigerant R410A cannot be used for earlier models 1.Compressor specifications are different. If recharging a R22 or R407C compressor with R410A, durability will significantly decrease since some of the materials used for compressor parts are different.
  • Page 6: Table Of Contents

    CONTENTS Section 1: CONTROL FUNCTIONS ......... . 1-1 1.
  • Page 7: Control Functions

    Mini VRF SYSTEM Contents Control Functions 1. CONTROL FUNCTIONS 1. Introduction ............1-2 2.
  • Page 8: Introduction

    Mini VRF SYSTEM 1. Introduction Control Functions OUTDOOR UNIT Mini VRF is a multi system that is connected to a single outdoor unit. The outdoor unit contains an inverter com- pressor. To operate this system, the below settings must be made at the time of the test run. Table 1-1 At shipment Setting item...
  • Page 9: Compressor Control

    Mini VRF SYSTEM 2. Compressor Control Control Functions 2-1. Compressors Mounted on Outdoor Units Capacity Type Compressors mounted Rotary DC Inverter 2-2. Compressor Stop Rules After a compressor stops, it will not start again for a period of 3 minutes (3 minutes forced OFF). However, this does not apply to the Special Control described later, when operation of the compressor is forcibly stopped as part of a control operation.
  • Page 10 Mini VRF SYSTEM 2. Compressor Control Control Functions 2-3-1. Roadmap control in cooling mode With this control, the below evaporation temperature control and condensation temperature control are both used. Control is performed according to the following order of priority: Control order of priority Area C >...
  • Page 11 Mini VRF SYSTEM 2. Compressor Control Control Functions 2-3-2. Roadmap control in heating mode Roadmap control is performed using the below condensation temperature control. Condensation temperature (=Tc) control (Area D) Thermostat OFF 133.7°F 133.5°F Horsepower decrease (Area C) 123.9°F 123.8°F Horsepower increase prohibited (Area B) 120.2°F...
  • Page 12: Compressor Control

    Mini VRF SYSTEM 2. Compressor Control Control Functions Current protection Inverter compressor current control is composed of primary current control and secondary current control. Current protection control for the inverter compressor is performed by self-protection in the inverter circuit, and is not based on a calculated increase/decrease in compressor capacity.
  • Page 13: Special Controls

    Mini VRF SYSTEM 3. Special Controls Control Functions In addition to ordinary heating and cooling operation, this system also includes the following 4 types of special controls for control of the system as a whole: 3-1. 4-way valve switching control 3-2.
  • Page 14 Mini VRF SYSTEM 3. Special Controls Control Functions 3-2. Reverse Cycle Start Control Reverse cycle start control is performed under the following conditions: • The outdoor unit starts in Heating mode after microcomputer initialization when the power was turned ON. •...
  • Page 15 Mini VRF SYSTEM 3. Special Controls Control Functions 3-4-3. Frost detection Frost is not detected at the outdoor unit heat exchanger for 5 minutes after operation starts. Frost is detected when either Condition 1 or 2 below is met. Heat exchange liquid temperature °F Defrosting operation (The end temperature is Condition 1:...
  • Page 16: Other Control

    Mini VRF SYSTEM 4. Other Control 5. Operation of Solenoid Valves Control Functions 6. Outdoor Unit Electronic Control Valve (Motor Valve) Control [MOV1] 4. Other Control 4-1. Indoor Unit Self-Separator Oil Recovery Control Refer to the indoor unit special control item. 5.
  • Page 17: Outdoor Fan Control

    Mini VRF SYSTEM 7. Outdoor Fan Control Control Functions 7-1. Outdoor Fan (Min. Fan Mode and Max. Fan Mode) These outdoor units utilize a DC fan motor that can be controlled using a maximum of 15 increments (15 fan modes). Outdoor unit Min.
  • Page 18: Indoor Unit Electronic Control Valve Control

    Mini VRF SYSTEM 8. Indoor Unit Electronic Control Valve Control Control Functions INDOOR UNIT 8-1. During Normal Control During Cooling mode operation Electronic control valve position (pulses) Outdoor unit operating Outdoor unit stopped Stop 20 pulses 20 pulses 20 pulses 20 pulses Thermostat OFF 20 pulses...
  • Page 19: Indoor Special Control

    Mini VRF SYSTEM 8. Indoor Unit Electronic Control Valve Control Control Functions 9. Indoor Special Control 8-2. During Special Control Control type Operating mode Target indoor units Electronic control valve position (pulses) Fixed pulses for cooling, corresponding to Cooling All indoor units the indoor unit capacity 4-way valve switching control...
  • Page 20: Discharge Gas Temperature

    Mini VRF SYSTEM 10. Discharge Gas Temperature Control Functions 11. Current Protection 10-1. Discharge Gas Temperature Protection Alarm The compressor upper-limit discharge temperature is 222°F. If the discharge temperature reaches 222°F, then the compressor stops. If the discharge temperature reaches 222°F 4 times repeatedly after restart, an alarm occurs.
  • Page 21: Pressure Sensor Failure

    Mini VRF SYSTEM 11. Current Protection 12. Pressure Sensor Failure Control Functions 13. 4-Way Valve Failure [L18] 11-2. Inverter Compressor Alarm Description Occurs when overcurrent (32.5 A) is detected during normal operation. Occurs under the same conditions as P16, when the inverter compressor is operating at 80 Hz or higher.
  • Page 22: Servicing And Maintenance Functions

    Mini VRF SYSTEM 14. Servicing and Maintenance Functions Control Functions The below functions are available, and are selected by the outdoor unit EEPROM settings. 14-1. Outdoor Unit Noise Countermeasures (outdoor Quiet mode function) This function reduces the operating noise to lessen the noise produced by the outdoor unit. When this mode is selected, noise reduction is given priority during operation, and the outdoor fan mode and compressor operating frequency are restricted (to approximately 80% of capacity).
  • Page 23: Outdoor Unit Repair Procedures

    Mini VRF SYSTEM Contents Outdoor Unit Repair Procedures 2. OUTDOOR UNIT REPAIR PROCEDURES Layout Diagram: Sensors and Solenoid Valves ....... . . 2-2 Layout Diagram: Sensors .
  • Page 24: Layout Diagram: Sensors And Solenoid Valves

    Mini VRF SYSTEM Layout Diagram: Sensors and Solenoid Valves Outdoor Unit Repair Procedures (suction thermistor) (electronic motor-operated valve) (4-way valve) (condenser 1 thermistor) 2 - 2...
  • Page 25: Layout Diagram: Sensors

    Mini VRF SYSTEM Layout Diagram: Sensors Outdoor Unit Repair Procedures (suction thermistor) (condenser 1 thermistor) 2 - 3...
  • Page 26: Removing Panels

    Mini VRF SYSTEM 1. Removing Panels Outdoor Unit Repair Procedures (1) Front panel removal (Fig. 2-1) • Remove the front panel (remove 3 screws). (2) Cover A removal (Fig. 2-1) • Remove the cover A (remove 1 screw). Front panel Cover A Fig.
  • Page 27: Discharging Oil In Compressor

    Mini VRF SYSTEM 2. Discharging Oil in Compressor Outdoor Unit Repair Procedures 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.
  • Page 28: Recovering Refrigerant

    Outdoor Unit Repair Procedures The following equipment and tools are required: Jumper wire with clips, adjustable wrench, set of manifold gauge valves specially designed for refrigerant R410A only, vacuum pump, refrigerant recovery unit, pre-purged refrigerant cylinder for recovery (air already evacuated), and hex wrench (4 mm for liquid tube and 5 mm for gas tube).
  • Page 29 Mini VRF SYSTEM 3. Recovering Refrigerant Outdoor Unit Repair Procedures 3-2. Refrigerant Recovery Procedures (Indoor Unit) The flowchart below shows the refrigerant recovery procedures you must follow when replacing or repairing the indoor unit due to trouble in the refrigerant circuit. START 3-2-1.
  • Page 30 Mini VRF SYSTEM 3. Recovering Refrigerant Outdoor Unit Repair Procedures 3-2-1. Cooling operation (for all units) Short-circuit the TEST pin (CN44) on the outdoor control PCB. Let the unit operate for a while, then check if it is running in Cooling mode or Heating mode by touching the gas line with your finger.
  • Page 31 Mini VRF SYSTEM 3. Recovering Refrigerant Outdoor Unit Repair Procedures Manifold gauge Refrigerant recovery unit Refrigerant Ball valve recovery cylinder (separately purchased) Gas tube Service port Indoor unit Outdoor unit Liquid tube Fig. 2-4 2 - 9...
  • Page 32 Mini VRF SYSTEM 3. Recovering Refrigerant Outdoor Unit Repair Procedures 3-2-3. Refrigerant recovery procedures (B): for indoor unit with no ball valve Refrigerant in all indoor units and the refrigerant tubing circuit must be pumped into the outdoor unit (referred to as “pump down”).
  • Page 33: Checking For Leakage After Repair

    Mini VRF SYSTEM 4. Checking for Leakage After Repair Outdoor Unit Repair Procedures 4-1. Pressure Check for Leakage of Outdoor Unit After completing repair of the outdoor unit, carry out the following leakage check. Check that all service valves for gas line, and liquid line in the repaired outdoor unit are fully closed. Connect the manifold gauge valves to the high- and low-pressure sensor outlets of the outdoor unit.
  • Page 34: Evacuating System

    Mini VRF SYSTEM 5. Evacuating System Outdoor Unit Repair Procedures This procedure is carried out to ensure there is no remaining refrigerant or other gases (nitrogen, etc.) in the repaired outdoor unit and tubing. 5-1. Evacuating Repaired Outdoor Unit Check that each service valve of the gas line, and the liquid line in the outdoor unit are fully closed. * If the AP pins (CN46) on the outdoor control PCB have already been short-circuited, steps (2) and (5) are not necessary.
  • Page 35: Charging Compressor Oil

    Mini VRF SYSTEM 6. Charging Compressor Oil Outdoor Unit Repair Procedures 6-1. 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 of the tank and take care that no air (in the form of bubbles) is permitted to enter the tank.
  • Page 36 Mini VRF SYSTEM 6. Charging Compressor Oil Outdoor Unit Repair Procedures Open to run, then close to stop Manifold gauge Upper side valve Close to stop Lower side valve Vacuum pump Fig. 2-10 (3) Charging compressor oil into outdoor unit Connect the lower valve to the low-pressure sensor outlet (with Schrader-type, push-to-release valve) in the outdoor unit to be oil-charged, and then connect the high-pressure sensor outlet (with push-to-release valve) to the upper valve via the manifold gauge valves (at Hi-pressure gauge side).
  • Page 37 Mini VRF SYSTEM 6. Charging Compressor Oil Outdoor Unit Repair Procedures Next, start Cooling mode operation of the outdoor unit to be oil-charged. When cooling operation reaches a stable condition, open each valve corresponding to these procedures in the order given: Procedure 1: Open the Hi-side gauge manifold valve Procedure 2: Open the upper valve Procedure 3: Open the lower valve...
  • Page 38 Mini VRF SYSTEM 6. Charging Compressor Oil Outdoor Unit Repair Procedures 6-2. 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 “6-1.
  • Page 39: Pumping Out Refrigerant From Outdoor Unit

    Mini VRF SYSTEM 7. Pumping Out Refrigerant from Outdoor Unit Outdoor Unit Repair Procedures Required equipment and tools: Jumper wire with clips, adjustable wrench, set of manifold gauge valves, vacuum pump, refrigerant recovery unit, pre-purged refrigerant cylinder for recovery, and hex wrench (4 mm for liquid tube and 5 mm for gas tube).
  • Page 40: Pumping Out Refrigerant From Outdoor Unit

    Mini VRF SYSTEM 7. Pumping Out Refrigerant from Outdoor Unit Outdoor Unit Repair Procedures NOTE To determine the completion of refrigerant recovery, follow the instructions that came with the refrigerant recovery unit. Low-pressure outlet port (For ø5/16" connector) Manifold gauge Connect from here to refrigerant recovery unit Fig.
  • Page 41: Compressor

    Mini VRF SYSTEM 8. Compressor Outdoor Unit Repair Procedures 8-1. Compressor Trouble Diagnosis and Check Methods Generally, compressor failures can be classified into the following categories. Mechanical trouble (A) Locking (intrusion of foreign objects, galling, etc.) (B) Pressure rise failure (damaged valve, seal, bearing, or other component) (C) Noise (damaged stator, rotor, valve, or other component) Electrical trouble (A) Coil burning...
  • Page 42 If, when the oil is inspected, there is an outdoor unit where the oil color phase is 4.0 or higher, or where a sharp odor is present, carry out all steps below to perform dry core cleaning. * The operating pressure is approximately 1.5 times higher than with R22 or R407C. Therefore use R410A dry cores.
  • Page 43 Mini VRF SYSTEM 8. Compressor Outdoor Unit Repair Procedures (18) Remove dry cores. Connect the tube that runs Outdoor unit from the liquid tube valve to the ball valve. Liquid tube service port (19) At the outdoor unit where dry cores were removed, pressurize with 362.6 psi of nitrogen from the liquid tube service port and check for leaks.
  • Page 44: High Pressure Sensor

    • Be sure to perform refrigerant charge using liquid refrigerant. (Schrader-type) (11) Never use any refrigerant other than R410A. 9. High Pressure Sensor The high pressure sensor connection port on the outdoor unit includes a Schrader-type, push-to-release valve. It is not necessary to recover the refrigerant when removing and installing the sensor.
  • Page 45: Outdoor Unit Maintenance Remote Controller

    Mini VRF SYSTEM Contents Outdoor Unit Maintenance Remote Controller 3. OUTDOOR UNIT MAINTENANCE REMOTE CONTROLLER 1. Overview ............. . . 3-2 2.
  • Page 46: Overview

    Mini VRF SYSTEM 1. Overview Outdoor Unit Maintenance Remote Controller [Service Checker Section] OUTDOOR UNIT MAINTENANCE REMOTE CONTROLLER (CZ-RTC2) for MINI VRF ■ About the outdoor unit maintenance remote controller The outdoor unit utilizes nonvolatile memory (EEPROM) on its PCB. This allows EEPROM data to replace the setting switches that were present on previous PCBs.
  • Page 47: Functions

    Mini VRF SYSTEM 2. Functions Outdoor Unit Maintenance Remote Controller ■ Functions on the ordinary display (1) Functions: Button operations can be used to perform the following functions. • Start/stop of all indoor units • Switching between cooling and heating •...
  • Page 48: Ordinary Display Controls And Functions

    Mini VRF SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller ■ Functions on the ordinary display • Connect the special service checker wiring to the outdoor unit PCB. The connection is shown in the figure below. Outdoor unit PCB RC (3P, BLU) PCB connector (3P, BLU)
  • Page 49 Mini VRF SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller ● All units start/stop (Fig. 3-1) <Operation> (ON/OFF operation) button can be used to start and stop all the indoor units. • The LED illuminates if any indoor units is operating. •...
  • Page 50 Mini VRF SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller ■ Display (functions) • Use the temperature setting buttons to change the item code. Item code Item Remarks Outdoor unit alarm Alarm code display No. of connected indoor units Quantity Unit Nos.
  • Page 51 Mini VRF SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller ■ XX-YY R.C. (Fig. 3-4) Displays the outdoor unit sub-bus address which is currently selected. XX = Outdoor system address on main bus line (1 – 30) YY = Outdoor unit sub-bus address.
  • Page 52 Mini VRF SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller ■ Concerning the 7-segment, 4-digit display remote controller timer display The unit Nos. of connected units are indicated by four 7-segment digits ( ) and a colon. ●...
  • Page 53: Monitoring Operations

    Mini VRF SYSTEM 4. Monitoring Operations Outdoor Unit Maintenance Remote Controller Display the indoor unit and outdoor unit sensor temperatures. <Operating procedure> ➀ Press and hold the (CHECK) button and buttons simultaneously for 4 seconds or longer to engage temperature monitor mode. During temperature monitoring, displays.
  • Page 54 Mini VRF SYSTEM 4. Monitoring Operations Outdoor Unit Maintenance Remote Controller ■ Display of unit No. 1 Description Remarks Intake temp. °F °F °F °F Indoor unit Discharge temp. °F Discharge temp. setting °F Indoor unit electronic control valve position STEP Discharge temp.
  • Page 55: Outdoor Unit Alarm History Monitor

    Mini VRF SYSTEM 5. Outdoor Unit Alarm History Monitor Outdoor Unit Maintenance Remote Controller • Displays outdoor unit alarms only. • Check the indoor unit alarm histories separately using the indoor unit remote controllers or other control device. <Operating procedure> ➀...
  • Page 56: Mode Settings

    Mini VRF SYSTEM 6. Mode Settings Outdoor Unit Maintenance Remote Controller ■ Setting mode 1 Display of fi rst 4 digits <Operating procedure> ➀ Press and hold the (CHECK) button and (VENTILATION) button simultaneously for 4 seconds or longer. ➁ Press the temperature setting buttons to change the item code.
  • Page 57 (CHECK) button. Returns to the normal display mode. Display of fi rst 4 digits Display of last 4 digits <Refrigerant type> A and B are displayed alternately. (Example shows 0000 0410 (R410A).) List of Item Codes Parameter Description Outdoor unit capacity...
  • Page 58 – MEMO – 3 - 14...
  • Page 59: Remote Controller Functions

    Mini VRF SYSTEM Contents Remote Controller Functions 4. REMOTE CONTROLLER FUNCTIONS 1. Simple Settings Function ..........4-2 2.
  • Page 60: Simple Settings Function

    Mini VRF SYSTEM 1. Simple Settings Function Remote Controller Functions • This allows the filter lifetime, operating mode [Remote Controller Functions Section] priority change, central control address, and other settings to be made for an individual or group- control indoor unit to which the remote controller used for simple settings is connected.
  • Page 61 Mini VRF SYSTEM 1. Simple Settings Function Remote Controller Functions List of Simple Setting Items Setting data Item code Item Description 0000 Not displayed 0001 150 hours 0002 2,500 hours Filter sign ON time (fi tlter life time) 0003 5,000 hours 0004 10,000 hours 0005...
  • Page 62: Detailed Settings Function

    Mini VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions • This allows the system address, indoor unit address, and other settings to be made for the individual or group-control indoor unit to which the remote controller used for detailed settings is connected.
  • Page 63 Mini VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions List of Detailed Setting Items Setting data Item code Item Description Description Description 1-Way Air Discharge 4-Way Air Discharge (Mini) (Slim) Concealed- 0001 0000 0005 Semi-Concealed (D1) Semi-Concealed (U1, Y1) Duct (F1, M1) Concealed-Duct High Type...
  • Page 64 Mini VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions Setting data Item code Item Description 0000 5 minutes (1B) Forced thermostat ON time 0001 4 minutes –010 –20°F –009 –18°F Cooling discharge –008 –16°F temperature shift 0010 +20°F –010 –20°F –009 –18°F...
  • Page 65 Mini VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions Setting data Item code Item Description 0000 No forced operation 0001 Forced operation for 1 minute Automatic drain pump operation 0060 Continuous operation 0000 None Ventilation fan operation 0001 Ventilation fan operated by remote controller. 0000 Not used.
  • Page 66 Mini VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions Setting data Item code Item Description DC fan tap operating Purpose mode 0000 Standard Standard (setting at shipment) High ceiling use High ceiling setting 1 (with standard panel) 0001 For low Ultra long-life fi...
  • Page 67 Mini VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions Simple setting items Item code Item Description Filter sign ON time setting Changes the indoor unit fi lter lifetime when a high-performance fi lter or other (fi lter lifetime) optional product is installed. Reduces the fi...
  • Page 68 Mini VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions Item code Item Description Set when using a central control device. Central control address Used when setting the central control address manually from the remote controller. Operating mode priority change Note (1) NOTE (1) Explanation of operation mode priority change...
  • Page 69 Mini VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions When the operating mode at the priority remote controller is changed, the operating modes of other remote controllers change as shown below. Mode change at priority remote controller Operating modes at other remote controllers Current mode New mode Current mode...
  • Page 70 Mini VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions Item code Item Description Unit type Set when the indoor unit EEPROM memory is replaced during servicing. Indoor unit capacity System (outdoor unit) address These are not set at the time of shipping from the factory. These must be set after installation if automatic address setting is not Indoor unit address performed.
  • Page 71 Mini VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions Item code Item Description 1F (Upper limit) Cooling 20 (Lower limit) 21 (Upper limit) This setting changes the temperature range (upper limit and lower limit) Heating 22 (Lower limit) Change to the remote which is set from the remote controller or central control device.
  • Page 72 Mini VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions (Continued from previous page) Item code Item Description Heat exchanger temperature for The heat exchanger temperature control point for prevention of cold air cold air discharge discharge during heating operation can be changed. The indoor unit PCB optional output for the fan can be switched Fan output switching according to the purpose of use.
  • Page 73: Remote Controller Servicing Functions

    Mini VRF SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions • The remote controller includes a number of servicing functions. Use these as needed for test runs and inspections. List of Servicing Functions Functions Description Button operation Reset operation Unit status Operation with Press and hold the...
  • Page 74 Mini VRF SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions Test Run Function Operates the unit with the thermostat forced ON. <Procedure> ➀ Press and hold the button for 4 seconds or longer. ➁ “Test” appears on the remote controller LCD display (Fig.
  • Page 75 Mini VRF SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions ■ Sensor Temperature Display Function (displayed regardless of whether unit is operating or stopped) The procedure below displays the sensor temperatures from the remote controller, indoor unit, and outdoor unit on the remote controller. <Procedure>...
  • Page 76 Mini VRF SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions Outdoor unit sensors Indoor unit sensors Unit No.1 Intake temp. Discharge temp. 1 — High-pressure sensor temp. Heat exchanger gas 1 Heat exchanger liquid 1 — Discharge temp. — Discharge temp.
  • Page 77: Trouble Diagnosis

    Mini VRF SYSTEM Contents Trouble Diagnosis 5. TROUBLE DIAGNOSIS 1. Contents of Remote Controller Switch Alarm Display ......5-2 2.
  • Page 78: Contents Of Remote Controller Switch Alarm Display

    Mini VRF SYSTEM 1. Contents of Remote Controller Switch Alarm Display Trouble Diagnosis Blinking: OFF: Wired Wireless remote remote controller control receiver display display Possible cause of malfunction Error in receiving serial communication signal. Remote controller is Serial detecting error signal from (Signal from main indoor unit in case of group control) <E01>...
  • Page 79 Mini VRF SYSTEM 1. Contents of Remote Controller Switch Alarm Display Trouble Diagnosis Blinking: OFF: Wired Wireless remote remote controller control receiver display display Possible cause of malfunction Incorrect discharge temperature. (Comp.) Activation of Protective device in outdoor protective unit is activated. Operation of O sensor device...
  • Page 80: Outdoor Unit Control Panel Led Display

    Mini VRF SYSTEM 2. Outdoor Unit Control Panel LED Display Trouble Diagnosis : ON : Blinking : OFF ) Display meaning D042(1) D043(2) After the power is turned ON (and automatic address setting is not in progress), no communica- tion with the indoor units in that system is possible. (Both ON) After power is turned ON (and automatic address setting is not in progress), 1 or more indoor units are confirmed in that system;...
  • Page 81: Remote Controller Servicing Functions

    Mini VRF SYSTEM 3. Remote Controller Servicing Functions Trouble Diagnosis Sensor temperature display function (displayed regardless of whether unit is operating or stopped) Use the following check procedure to display the sensor temperatures from the remote controller, indoor unit, and outdoor unit sensors on the remote controller display.
  • Page 82: Mini Vrf Alarm Codes

    Mini VRF SYSTEM 4. Mini VRF Alarm Codes Trouble Diagnosis Alarms for outdoor units Alarm Code Alarm Meaning Page Outdoor unit failed to receive serial communication signals from indoor unit. Automatic address setting start is prohibited. Automatic address setting alarm (too few units) Automatic address setting alarm (too many units) No indoor units at automatic address setting.
  • Page 83 Mini VRF SYSTEM 4. Mini VRF Alarm Codes Trouble Diagnosis E06 alarm Alarm code Alarm meaning Outdoor unit failed to receive serial communication signals from indoor unit. Alarm conditions No serial communications from indoor unit Probable cause (1) The indoor unit power was cut OFF after initial communications were completed. (2) An open circuit or short circuit occurred in the inter-unit control wiring after initial communications were completed.
  • Page 84 Mini VRF SYSTEM 4. Mini VRF Alarm Codes Trouble Diagnosis E16 alarm Alarm code Alarm meaning Automatic address setting alarm (too many units) Alarm conditions • The number of indoor units was too many when automatic address setting was performed. •...
  • Page 85 Mini VRF SYSTEM 4. Mini VRF Alarm Codes Trouble Diagnosis F04 alarm Alarm code Alarm meaning Compressor 1 discharge temperature sensor trouble Alarm conditions (1) A temperature of 212°F or higher was detected 20 minutes or longer after that compressor stopped running.
  • Page 86 Mini VRF SYSTEM 4. Mini VRF Alarm Codes Trouble Diagnosis F07 alarm Alarm code Alarm meaning Liquid temperature sensor (C1) trouble at outdoor heat exchanger Alarm conditions (1) A/D step is 10 steps or less (short circuit). (2) A/D step is 1014 steps or more (open circuit). Probable cause (1) Sensor malfunction (including connector) (2) PCB malfunction...
  • Page 87 Mini VRF SYSTEM 4. Mini VRF Alarm Codes Trouble Diagnosis F16 alarm Alarm code Alarm meaning High-pressure sensor trouble Alarm conditions The saturation temperature at the detected pressure is 10°F or more below the highest indoor-unit E1 temperature continuously for 30 minutes. Probable cause (1) High-pressure sensor malfunction (2) Failure to connect the connector to the outdoor unit PCB...
  • Page 88 Mini VRF SYSTEM 4. Mini VRF Alarm Codes Trouble Diagnosis F31 alarm Alarm code Alarm meaning Outdoor unit non-volatile memory (EEPROM) trouble Alarm conditions (1) Non-volatile memory is not present when power initialization occurs. (2) Read values do not match after writing to non-volatile memory is complete. Probable cause (1) Memory was not inserted after the PCB was replaced.
  • Page 89 Mini VRF SYSTEM 4. Mini VRF Alarm Codes Trouble Diagnosis H31 alarm Alarm code Alarm meaning HIC trouble alarm Alarm conditions This alarm occurs when the microcomputer identifies a trouble signal (indicating abnormal HIC temperature or other trouble) from the HIC. Probable cause The HIC judges the current and temperature, and outputs the trouble signal.
  • Page 90 Mini VRF SYSTEM 4. Mini VRF Alarm Codes Trouble Diagnosis L05 alarm Alarm code Alarm meaning Indoor unit priority duplication (at priority indoor units) Alarm conditions More than 1 indoor unit set for priority was detected. Probable cause More than 1 indoor unit is set for priority. Check From the wired remote controller, use the indoor unit EEPROM simple setting mode and check that the value of item code 04 is “0001.”...
  • Page 91 Mini VRF SYSTEM 4. Mini VRF Alarm Codes Trouble Diagnosis L18 alarm Alarm code Alarm meaning 4-way valve operation failure Alarm conditions During heating, when 2 minutes and 30 seconds have elapsed after compressor operation started, the temperature difference between the outdoor air temperature sensor and the heat exchanger liquid temperature sensor (C1) is 40°F or higher.
  • Page 92 Mini VRF SYSTEM 4. Mini VRF Alarm Codes Trouble Diagnosis P16 alarm Alarm code Alarm meaning Inverter compressor overcurrent alarm Alarm conditions This alarm occurs when current trouble or current detection trouble occurs at an inverter frequency of less than 80 Hz after start (when trouble judgment current is detected in the primary or secondary current, or when an instantaneous secondary current of 48 A or higher is detected).
  • Page 93 Mini VRF SYSTEM 4. Mini VRF Alarm Codes Trouble Diagnosis P29 alarm Alarm code Alarm meaning Inverter compressor missing phase or lock alarm Alarm conditions This alarm may occur at start, and occurs when missing phase or lock is detected, and when a DCCT failure occurs.
  • Page 94: Inspection Of Parts (Outdoor Unit)

    Mini VRF SYSTEM 5. Inspection of Parts (Outdoor Unit) Trouble Diagnosis Electronic control valve (MOV1) MOV1: Measure the voltage between plug pin 5 and pins 1 through 4 at the CN41 connector (6P, white) on the outdoor unit control PCB. (Because of the pulse output, a simplified measurement method is used. Set the tester to the 12 V range;...
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