Panasonic LZ2 Service Manual & Test Run Service Manual
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Panasonic LZ2 Service Manual & Test Run Service Manual

Panasonic LZ2 Service Manual & Test Run Service Manual

Mini vrf system r32, outdoor units, rated capacity 8/10 hp
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Order No. SBPAC2011011CE
SERVICE MANUAL & TEST RUN SERVICE MANUAL
Mini VRF SYSTEM
R32
Model No.
Outdoor Units
HP = horsepower
Rated Capacity
Type Outdoor Unit Type
8 HP
10 HP
LZ2 mini VRF System
U-8LZ2E8
U-10LZ2E8
SM830289-01
REFERENCE NO.

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  • Page 1 Order No. SBPAC2011011CE SERVICE MANUAL & TEST RUN SERVICE MANUAL Mini VRF SYSTEM Model No. Outdoor Units HP = horsepower Rated Capacity Type Outdoor Unit Type 8 HP 10 HP LZ2 mini VRF System U-8LZ2E8 U-10LZ2E8 SM830289-01 REFERENCE NO.
  • Page 2 Model No. • To be connecting Indoor Unit Indoor Units Rated Capacity Type Indoor Unit Type U2 4-Way Cassette S-22MU2E5B S-28MU2E5B S-36MU2E5B S-45MU2E5B S-56MU2E5B S-60MU2E5B Y2 4-Way Cassette 60 × 60 S-15MY2E5B S-22MY2E5B S-28MY2E5B S-36MY2E5B S-45MY2E5B S-56MY2E5B K2 Wall-Mounted S-15MK2E5B S-22MK2E5B S-28MK2E5B S-36MK2E5B S-45MK2E5B S-56MK2E5B M1 Slim Low Static Ducted S-15MM1E5B S-22MM1E5B S-28MM1E5B S-36MM1E5B S-45MM1E5B S-56MM1E5B Rated Capacity...

  • Page 3: Please Read Before Starting

    IMPORTANT! • The product meets the technical requirements of EN/IEC 61000-3-3. Please Read Before Starting • Pay close attention to all warning and caution notices given in this manual. This air conditioner must be installed by the sales dealer • An RCD suitable for use with inverters, resistant to or installer.

  • Page 4: When Transporting

    • Do not supply power to the unit until all wiring and tubing are completed or reconnected and checked. • Highly dangerous electrical voltages are used in this system. Carefully refer to the wiring diagram and these instructions when wiring. Improper connections and inadequate grounding can cause accidental injury or death.
  • Page 5 …In a Room Properly insulate any tubing run inside a room to prevent “sweating” that can cause dripping and water damage to walls and floors. WARNING • If the air conditioner is installed in a small room, take measures to prevent the refrigerant concentration from exceeding the safety limit in the event of refrigerant leakage.
  • Page 6 • A halide torch (or any other detector using a naked flame) shall not be used. • Electronic leak detectors may be used to detect refrigerant leaks but, the sensitivity may not be adequate, or may need re-calibration. (Detection equipment shall be calibrated in a refrigerant-free area.) •...
  • Page 7 CAUTION • Ventilate any enclosed areas when installing or testing the refrigeration system. Leaked refrigerant gas, on contact with fire or heat, can produce dangerously toxic gas. • Confirm after installation that no refrigerant gas is leaking. If the gas comes in contact with a burning stove, gas water heater, electric room heater or other heat source, it can cause the generation of toxic gas and fire.
  • Page 8 (3) The area shall be checked with an appropriate refrigerant detector prior to and during work, to ensure the technician is aware of potentially toxic or flammable atmospheres. Ensure that the leak detection equipment being used is suitable for use with all applicable refrigerants, i.e. non-sparking, adequately sealed or intrinsically safe.

  • Page 9: Removal And Evacuation

    • Particular attention shall be paid to the following to ensure that by working on electrical components, the casing is not altered in such a way that the level of protection is affected. This shall include damage to cables, excessive number of connections, terminals not made to original specification, damage to seals, incorrect fitting of glands, etc.

  • Page 10: Charging Procedures

    CHARGING PROCEDURES CAUTION • In addition to conventional charging procedures, the following requirements shall be followed. Ensure that contamination of different refrigerants does not occur when using • charging equipment. Hoses or lines shall be as short as possible to minimize the amount of refrigerant •...
  • Page 11 i) Do not exceed the maximum working pressure of the cylinder, even temporarily. j) When the cylinders have been filled correctly and the process completed, make sure that the cylinders and the equipment are removed from site promptly and all isolation valves on the equipment are closed off. k) Recovered refrigerant shall not be charged into another refrigerating system unless it has been cleaned and checked.
  • Page 12 • The evacuation process shall be carried out prior to returning the compressor to the suppliers. • Only electric heating to the compressor body shall be employed to accelerate this process. • When oil is drained from a system, it shall be carried out safely.

  • Page 13: Check Of Density Limit

    Check of Density Limit Check the amount of refrigerant in the system and floor space of the room according to the legislation on refrigerant drainage. If there is no applicable legislation, follow the standards described below. The refrigerant (R32), which is used in the air conditioner, is a flammable refrigerant. So the requirements for the maximum refrigerant charge amount [m ] used in the appliance are determined according to installation space of the appliance.
  • Page 14 < Whether or not to use R32 refrigerant leakage detection sensor > • According to the type of diagrams shown in Fig. 2, it is necessary to install R32 refrigerant leakage detection sensor if the installation space is within the range of using R32 refrigerant leakage detection sensor.
  • Page 15 Here is one of an example shown below. The following diagram is subject to change according to the type of the connected indoor units. Refer to each indoor unit Service Manual. Example: Fig. 2 4-Way Cassette 60 × 60 20.0 Type 15 15.0 Use of R32 refrigerant leakage detection sensor...
  • Page 16 20.0 Type 36 15.0 Use of R32 refrigerant leakage detection sensor 10.0 Nonuse of R32 refrigerant leakage detection sensor Floor area of the room (m²) Type 45 20.0 Type 56 15.0 Use of R32 refrigerant leakage detection sensor 10.0 Nonuse of R32 refrigerant leakage detection sensor Floor area of the room (m²)
  • Page 17 4-Way Cassette 60 × 60 Use or nonuse of R32 refrigerant leakage Nonuse detection sensor 15~56 45~56 Capacity of indoor unit Refrigerant charge amount (kg) 10.0 10.0 10.0 10.0 10.0 10.0 10.2 10.2 10.2 10.2 10.2 10.2 10.3 10.3 10.3 10.3 10.3 10.3...
  • Page 18 4-Way Cassette 60 × 60 Use or nonuse of R32 refrigerant leakage Nonuse detection sensor 15~ 56 45~56 Capacity of indoor unit Refrigerant charge amount (kg) 11.3 11.3 11.3 11.3 11.3 11.3 11.5 11.5 11.5 11.5 11.5 11.5 11.6 11.6 11.6 11.6 11.6...

  • Page 19: Precautions For Installation Using New Refrigerant

    Precautions for Installation Using New Refrigerant 1. Care regarding tubing 1-1. Process tubing ● Material: Use seamless phosphorous deoxidized copper tube for refrigeration. Wall thickness shall comply with the applicable legislation. The minimal wall thickness must be in accordance with the table below. ●...
  • Page 20 3. Different tools required 3-1. Tool specifications have been changed due to the characteristics of R32. Some tools for R22- and R407C-type refrigerant systems cannot be used. Different tools? R410A tools Item (From compatible Remarks R22 and with R32? R407C) Types of refrigerant, refrigerating machine oil, Manifold gauge and pressure gauge are different.
  • Page 21 Important Information Regarding The Refrigerant Used This product contains fluorinated greenhouse gases. Do not vent gases into the atmosphere. Refrigerant type: R32 value: 675 GWP = global warming potential Periodical inspections for refrigerant leaks may be required depending on European or local legislation.

  • Page 22: Table Of Contents

    — CONTENTS — Section 1: CONTROL FUNCTIONS - Outdoor Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 Introduction .
  • Page 23 Section 6: TROUBLE DIAGNOSIS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1 Contents of Remote Controller Switch Alarm Display .
  • Page 24 – MEMO – xxiii...

  • Page 25: Control Functions - Outdoor Unit

    Mini VRF SYSTEM Contents Control Functions - Outdoor unit 1. CONTROL FUNCTIONS - Outdoor unit 1. Introduction ............1-2 2.

  • Page 26: Introduction

    Mini VRF SYSTEM 1. Introduction Control Functions - Outdoor unit Mini VRF SYSTEM is a multi system that is connected to a single outdoor unit. The outdoor unit contains an inverter compressor. 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 27: Compressor Control

    Mini VRF SYSTEM 2. Compressor Control Control Functions - Outdoor unit (1) Compressors Mounted in the Outdoor Units Type of outdoor unit 10HP Inverter compressor ● ● Compressor 1 (High pressure rotary) * The inverter compressor is operated according to the load and does not operate beyond outdoor unit capacity. (2) Operating Frequency Range of Inverter Compressor The inverter compressor can operate within the range in the table below.

  • Page 28: Control Functions

    2WAY VRF SYSTEM Mini VRF SYSTEM 2. Compressor Control 3. Compressor Control Control Functions - Outdoor unit Control Functions (3) Forced Stopping of Compressor Once a compressor stops, it will not start for a period of 3 minutes (3-minute forced OFF). However, this is not applied when the compressor was forced to stop as the result of a special control operation.
  • Page 29 2WAY VRF SYSTEM Mini VRF SYSTEM 3. Compressor Control 2. Compressor Control Control Functions Control Functions - Outdoor unit 4-1. Evaporation temperature (= Te) control The cooling capacity is adjusted with this control. It prevents freezing of the indoor unit heat exchanger and the dew to the outside panel of the indoor unit.
  • Page 30 2WAY VRF SYSTEM Mini VRF SYSTEM 3. Compressor Control 2. Compressor Control Control Functions Control Functions - Outdoor unit 4-2. Condensation Temperature Control Target temperature of the Area B is different between cooling and heating operation. In Cooling Mode In Heating Mode The purpose of this control at cooling Heating capacity is adjusted with this control.
  • Page 31 2WAY VRF SYSTEM Mini VRF SYSTEM 2. Compressor Control 3. Compressor Control Control Functions Control Functions - Outdoor unit When the temperature falls in the Area D (over PX temperature), the operation stops within 0 to 30 seconds at the interval of the roadmap control. After Tc falls in the Area D and the thermostat is turned OFF, the system may resume operating from the lower compressor capacity.
  • Page 32 Mini VRF SYSTEM 2. Compressor Control Control Functions - Outdoor unit Current protection This restriction protects the compressor and controls the compressor electric current simultaneously. The current limitation value changes to “normal status” and “overload status” according to the outdoor temperature.

  • Page 33: Output Of Pcb

    2WAY VRF SYSTEM Mini VRF SYSTEM 4. Special Control 3. Output of PCB Control Functions Control Functions - Outdoor unit Items Remarks Indication on PCB 4-way valve Solenoid valve Oil recovery valve ORVR MOV for heat exchanger MOV1 Motor Operated Valve MOV for Sub cooler MOV4 Crankcase heater...
  • Page 34 2WAY VRF SYSTEM Mini VRF SYSTEM 3. Output of PCB 4. Special Control Control Functions Control Functions - Outdoor unit (3) Electronic Control Valves [MOV1, MOV4] 3-1. Type of Electronic control valves MOV1 is for adjusting refrigerant flow amount of outdoor heat exchanger. MOV4 is for adjusting refrigerant flow amount of Sub cooler.

  • Page 35: Outdoor Unit Fan Control

    2WAY VRF SYSTEM Mini VRF SYSTEM 5. Outdoor Unit Fan Control 4. Outdoor Unit Fan Control Control Functions Control Functions - Outdoor unit (1) Number of Fan Motor Type of outdoor unit 8･10HP Number of fan motor (2) Fan Step These outdoor units utilize a DC fan motor that can be controlled in 0〜15 steps.
  • Page 36 2WAY VRF SYSTEM Mini VRF SYSTEM 5. Outdoor Unit Fan Control 4. Outdoor Unit Fan Control Control Functions Control Functions - Outdoor unit (4) Fixed Initial Fan Step For the first 30 seconds after operation starts, the spep is fixed at the initial mode which was calculated from the relationship between the outdoor air temperature and the outdoor unit horsepower.
  • Page 37 2WAY VRF SYSTEM Mini VRF SYSTEM 5. Outdoor Unit Fan Control 4. Outdoor Unit Fan Control Control Functions Control Functions - Outdoor unit The system entirely becomes to the silent mode by setting in the main outdoor unit. EEPROM setting in main outdoor unit CODE : 05 Setting No.

  • Page 38: Outdoor Unit Ccu (Command Controller Unit) Control

    2WAY VRF SYSTEM Mini VRF SYSTEM 5. Outdoor Unit CCU (command controller 6. Outdoor Unit CCU (command controller unit) Control Control Functions - Outdoor unit Control Functions unit) Control Some actuators of indoor unit are controlled by CCU. MOV of Indoor Unit 1-1.
  • Page 39 2WAY VRF SYSTEM Mini VRF SYSTEM 5. Outdoor Unit CCU (command controller 6. Outdoor Unit CCU (command controller unit) Control Control Functions Control Functions - Outdoor unit unit) Control unit : pulse 1-2. Indoor unit with RAP valve kit Operating Operating Operating Thermostat...
  • Page 40 2WAY VRF SYSTEM Mini VRF SYSTEM 5. Outdoor Unit CCU (command controller 6. Outdoor Unit CCU (command controller unit) Control Control Functions Control Functions - Outdoor unit unit) Control (2) RAP Valve Kit Operating Operating Operating Thermostat RAP valve kit mode of mode of mode of...
  • Page 41 2WAY VRF SYSTEM Mini VRF SYSTEM 5. Outdoor Unit CCU (command controller 6. Outdoor Unit CCU (command controller unit) Control Control Functions Control Functions - Outdoor unit unit) Control 3-2. Heating mode The indoor unit fan in heating mode is stopped from the CCU in the following condition. Discharge air temperature of indoor unit ≤...
  • Page 42 2WAY VRF SYSTEM Mini VRF SYSTEM 5. Outdoor Unit CCU (command controller 6. Outdoor Unit CCU (command controller unit) Control Control Functions Control Functions - Outdoor unit unit) Control * Operating time “XX” under Section “(4) Drain Pump Control” described on previous page is able to set in EEPROM of the main outdoor unit.

  • Page 43: Oil Control

    2WAY VRF SYSTEM Mini VRF SYSTEM 7. Oil Control 6. Oil Control Control Functions Control Functions - Outdoor unit (1) Self-separator Oil Recovery Control Oil is recovered from the oil separator to the compressor through the ORVR. (2) System Oil Recovery Control All indoor units MOV are opened for recovering oil from indoor side to compressor.
  • Page 44 2WAY VRF SYSTEM Mini VRF SYSTEM 7. Oil Control 6. Oil Control Control Functions Control Functions - Outdoor unit (3) Indoor Unit Self Oil Recovery Control This control is carried out regularly when the system is in cooling mode. During stopped, fan mode setting or thermostat OFF condition at the indoor unit, MOV of the indoor unit is opened regularly for 1 minute (at the interval of approximately 40 minutes).

  • Page 45: Way Valve Adjustment Control

    2WAY VRF SYSTEM Mini VRF SYSTEM 7. 4-Way Valve Adjustment Control 8. 4-Way Valve Adjustment Control Control Functions Control Functions - Outdoor unit The purpose of this control is to change over the 4-way valve appropriately with big pressure difference. This control is performed at the following conditions.

  • Page 46: Defrost Control

    2WAY VRF SYSTEM Mini VRF SYSTEM 9. Defrost Control 8. Defrost Control Control Functions Control Functions - Outdoor unit (1) Type of Defrost Control This system uses the reverse cycle defrost. (2) Forced Conditions Defrost does not begin again for 35 minutes of operation after defrost was once completed. If the outdoor unit is stopped while defrosting due to protection control or another reason, then defrost control will not start for a minimum of 10 minutes after restart occurs.
  • Page 47 2WAY VRF SYSTEM Mini VRF SYSTEM 9. Defrost Control 8. Defrost Control Control Functions Control Functions - Outdoor unit Heating Operation Set Time (Defrosting Operation Prohibiting Time) When the heating operation time at system has exceeded “XX” minutes (35 minutes at initial setting), and at least one unit satisfies the decision of defrosting, the defrosting operation is effective.

  • Page 48: Demand Control

    2WAY VRF SYSTEM Mini VRF SYSTEM 10. Demand Control 9. Demand Control Control Functions Control Functions - Outdoor unit Demand Control Demand control is performed to suppress the horsepower not to make the primary current exceed the setting value. The standard value of the limit current is shown in the table below. Demand control is performed based on this current value.
  • Page 49 Mini VRF SYSTEM 2WAY SYSTEM 9. Demand Control 10. Upper Current Limitation Mode Control Functions - Outdoor unit Control Functions-Outdoor Unit NOTE Since the pattern “A” and “B” perform the outdoor unit current demand control (compressor’s suppressive drive), it is easy to grasp energy saving amount. However, it may cause the reduction of capacity in all indoor units of the same refrigerant system.

  • Page 50: Demand Control

    2WAY SYSTEM Mini VRF SYSTEM 2WAY SYSTEM 10. Upper Current Limitation Mode 10. Demand Control Control Functions-Outdoor Unit 9. Demand Control Control Functions Control Functions - Outdoor unit (4) When Using Demand Terminal Block Demand terminal block must be connected in order to perform the demand control. (It is also possible to connect the optional Seri-Para I/O unit (optional CZ-CAPDC2) and setup the system.) The current limitation values can be set by changing either contact.

  • Page 51: Other Functions

    2WAY VRF SYSTEM Mini VRF SYSTEM 12. Other Functions 10. Other Functions Control Functions Control Functions - Outdoor unit (1) Auto Cooling/Heating Function It is possible to select auto cooling/heating mode in each remote controller even in 2WAY VRF system. The system changes to cooling or heating operation according to number of thermostat ON mode.
  • Page 52 Mini VRF SYSTEM 10. Other Functions Control Functions - Outdoor unit (2) Setting when at Thermostat OFF in Cooling Mode When decreasing the indoor airflow volume at the cooling thermostat OFF or dry thermostat OFF, follow the setting procedure below. EEPROM setting in outdoor unit CODE: ED Indoor unit...

  • Page 53: Detailed Settings In Eeprom Of Outdoor Unit

    Mini VRF SYSTEM 11. Detailed Settings in EEPROM of Outdoor Control Functions - Outdoor unit Unit Never use the DN code unlisted in the following table. (P) : Factory preset mode Item Setting No. 0=Invalid (P) 1=Silent mode 1 Outdoor fan silent mode 2=Silent mode 2,,,,, 15=Silent mode 15 (For details, see Section "4.
  • Page 54 Mini VRF SYSTEM 11. Detailed Settings in EEPROM of Outdoor Control Functions - Outdoor unit Unit Never use the DN code unlisted in the following table. (P) : Factory preset mode Item Setting No. 0=Invalid (P) Outdoor silent mode as input setting "Valid" or "Invalid" 1=Valid from the indoor unit remote controller (For details, see Section "4.

  • Page 55: Outdoor Unit Control Pcb

    Mini VRF SYSTEM 12. Outdoor Unit Control PCB Control Functions - Outdoor unit 1-1. Outdoor Unit Control PCB LED2 LED1 JP001 CN-DISCH CN-EXL CN-SCT CN-OIL A.ADD CN-MOV2 CN-TO STOP CN-EXG TEST CN-HPS CN-EMG CN-ROM CN-RC CN-OC CN-MOV1 MODE CN-TERMINAL CN-SILENT CN-LPS 1 - 31...
  • Page 56 Mini VRF SYSTEM 12. Outdoor Unit Control PCB Control Functions - Outdoor unit (2) Outdoor Unit HIC PCB 1 - 32...
  • Page 57 Mini VRF SYSTEM 12. Outdoor Unit Control PCB Control Functions - Outdoor unit (3) Functions A. ADD pin (2P, Black) Auto address setting pin • Short-circuit this pin for 1 second or longer to automatically set the addresses at the indoor units that are connected to that outdoor unit and are within the same system.
  • Page 58 Mini VRF SYSTEM 12. Outdoor Unit Control PCB Control Functions - Outdoor unit CN-TERMINAL pin For communications circuit impedance matching (3P, Black) • A connecting socket (3P, Black) is attached to the terminal plug at the time of shipment from the factory.
  • Page 59 Mini VRF SYSTEM 12. Outdoor Unit Control PCB Control Functions - Outdoor unit Table 1 Examples of refrigerant circuit (R.C.) address settings (required when link wiring is used) (SW1, SW2) System address (SW1) System address (SW2) System address No. (2P DIP switch) (Rotary switch) 10 20 System 1 (factory setting)

  • Page 60: Electrical Data

    Mini VRF SYSTEM 13. Electrical Data Control Functions - Outdoor unit (1) Electric Wiring Diagram U-8LZ2E8, U-10LZ2E8 1 - 36...

  • Page 61: Control Functions - Indoor Unit

    Mini VRF SYSTEM Contents Control Functions - Indoor Unit 2. CONTROL FUNCTIONS - Indoor Unit * Refer to the Service Manual of Indoor Unit. 2 - 1...
  • Page 62 – MEMO – 2 - 2...

  • Page 63: Outdoor Unit Repair Procedures

    Mini VRF SYSTEM Contents Outdoor Unit Repair Procedures 3. OUTDOOR UNIT REPAIR PROCEDURES 1. Removing Panels ............3-2 2.

  • Page 64: Removing Panels

    Mini VRF SYSTEM 1. Removing Panels Outdoor Unit Repair Procedures Be sure to turn off the power before maintenance. When the power is turned off, wait for CAUTION 5 minutes without any work. Then start working. (1) Front panel removal •...

  • Page 65: Discharging Compressor Oil

    Mini VRF SYSTEM 2. Discharging Compressor Oil Outdoor Unit Repair Procedures 2-1. Discharging Oil in Compressor Recover the refrigerant in the outdoor unit following the procedures in “3. Recovering Refrigerant.” Remove the compressor and discharge the oil in it. See Section “8. Compressor” for detailed procedures. 2-2.

  • Page 66: Recovering Refrigerant

    Mini VRF SYSTEM 3. 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 R32 only, vacuum pump, refrigerant recovery unit, pre-purged refrigerant cylinder for recovery, flathead screwdriver, and outdoor unit maintenance remote controller.
  • Page 67 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 68 Mini VRF SYSTEM 3. Recovering Refrigerant Outdoor Unit Repair Procedures (2) If the remote controller is not available for maintenance of the outdoor unit 1 Short-circuit the MODE pin (“COOL” side) on the outdoor unit control PCB. 2 Short-circuit the CHK pin on the PCB to start test run operation. 3-2-2.
  • Page 69 Mini VRF SYSTEM 3. Recovering Refrigerant Outdoor Unit Repair Procedures 3-2-3. Refrigerant recovery procedures (2): Indoor unit with no ball valve equipped Refrigerant in all indoor units and the refrigerant tubing circuit can be pumped into the outdoor unit. The maximum refrigerant storage capacity per a single outdoor unit is approx.
  • Page 70 Mini VRF SYSTEM 3. Recovering Refrigerant Outdoor Unit Repair Procedures High-pressure outlet port (for ø7.94mm-dia connector) Low-pressure outlet port (for ø7.94mm-dia connector) Manifold gauge Liquid tube service port (for ø7.94mm-dia connector) Gas tube service port (for ø7.94mm-dia connector) Refrigerant recovery unit Refrigerant recovery cylinder Fig.

  • Page 71: 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. (1) Check that all service valves for gas tube and liquid tube in the repaired outdoor unit (units necessary to carry out the pressurized leak check) are fully closed.

  • Page 72: 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 (1) Check that each service valve of the gas tube and liquid tube in the outdoor unit are fully closed. (2) Connect the manifold gauge valves to the high-pressure and low-pressure sensor outlets of the outdoor unit.

  • Page 73: 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 drying inside the tank and take care that no air (in the form of bubbles) is permitted to enter the tank.
  • Page 74 Mini VRF SYSTEM 6. Charging Compressor Oil Outdoor Unit Repair Procedures Close Open Upper valve Manifold gauge Close Open Lower valve Vacuum pump When the predetermined amount of oil has been charged into the oil-charging tank, immediately close the lower valve.
  • Page 75 Mini VRF SYSTEM 6. Charging Compressor Oil Outdoor Unit Repair Procedures Next, follow the instructions in “3-2-1. Cooling operation (for all units)” at the outdoor unit where oil will be charged, and start cooling operation at all units. After the operating conditions were stabilized, open each valve (Hi-side manifold gauge, upper valve and lower valve) in sequence as follows.
  • Page 76 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 77: Pumping Out Refrigerant From Outdoor Unit

    Mini VRF SYSTEM 7. Pumping Out Refrigerant from Outdoor Unit Outdoor Unit Repair Procedures For the method used for additional oil charging after compressor replacement, see Section “6-1. If Refrigerant Has Already Been Charged to Outdoor Unit.” Required equipment and tools: Jumper wire with clips, adjustable wrench, set of manifold gauge valves for the refrigerant R32, refrigerant recovery unit, pre-purged refrigerant cylinder for recovery, flathead screwdriver, and outdoor unit maintenance remote controller.
  • Page 78 Mini VRF SYSTEM 7. Pumping Out Refrigerant from Outdoor Unit Outdoor Unit Repair Procedures (7) Short-circuit the AP pin on the outdoor unit control PCB. Then turn ON the outdoor unit power. When the AP pin is short-circuited and the power is turned ON, all solenoid valves in the outdoor unit are forced open, allowing the refrigerant to be recovered from all tubes which CAUTION are separated by solenoid valves.
  • Page 79 Mini VRF SYSTEM 7. Pumping Out Refrigerant from Outdoor Unit Outdoor Unit Repair Procedures (4) Then slowly close the liquid tube service valve. * When the low pressure at the outdoor unit to be repaired reaches 0.5 MPa or below, pull out the SCT connec- tor from the outdoor unit control PCB of that outdoor unit.

  • Page 80: 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. (1) 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) (2) Electrical trouble (A) Coil burning...
  • Page 81 Mini VRF SYSTEM 8. Compressor Outdoor Unit Repair Procedures 8-2. Replacing the Compressor(s) 8-2-1. Replacing compressor (1) Follow the instructions in “8-3. Removing Compressors” and replace the failed compressor. (2) Fully close the high- and low-pressure gauge valves on the manifold gauge, then stop the vacuum pump. (3) Disconnect the manifold gauge from vacuum pump.
  • Page 82 Mini VRF SYSTEM 8. Compressor Outdoor Unit Repair Procedures 8-2-2. Dry core cleaning If burning or other failures occur repeatedly at compressors, in many cases the cause is acid, sludge, carbon, or other substances that remain in the refrigeration cycle as the result of insufficient cleaning. 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.
  • Page 83 Mini VRF SYSTEM 8. Compressor Outdoor Unit Repair Procedures (16) After evacuating all nitrogen gas from the tubing, apply vacuum to outdoor unit where dry cores were removed until the pressure is –101kPa {–755 mm Hg, 5 Torr} or less. (17) Refer to the Installation Instructions for further information.

  • Page 84: Removing Compressors

    2WAY SYSTEM Mini VRF SYSTEM 9. Compressor 8. Compressor Outdoor Unit Repair Procedures Outdoor Unit Repair Procedures 8-3. Removing Compressors Use caution to prevent water or foreign particles from invading the refrigerant tube while removing and installing the compressor. 8-3-1. Removing Compressors After recovering refrigerant in the system, replace the nitrogen gas through the service valve port.

  • Page 85: Outdoor Unit Maintenance Remote Controller

    Mini VRF SYSTEM Contents Outdoor Unit Maintenance Remote Controller 4. OUTDOOR UNIT MAINTENANCE REMOTE CONTROLLER 1. Overview ............. . 4-2 2.

  • Page 86: Overview

    Mini VRF SYSTEM 1. Overview Outdoor Unit Maintenance Remote Controller OUTDOOR UNIT MAINTENANCE REMOTE [Service Checker Section] CONTROLLER (CZ-RTC4) for 2WAY VRF n 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 87: Functions

    Mini VRF SYSTEM 2. Functions Outdoor Unit Maintenance Remote Controller n 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 88: Ordinary Display Controls And Functions

    Mini VRF SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller n 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 When connecting the special service (3P, BLU)
  • Page 89 Mini VRF SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller All units start/stop <Operation> (Start/Stop operation) button can be used to start and stop all the indoor units. • The LED illuminates if any indoor units is operating. •...
  • Page 90 Mini VRF SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller n Display (functions) • Use the temperature setting buttons to change the item code. À Item code Á Item Remarks Outdoor unit alarm Alarm code display No.
  • Page 91 Mini VRF SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller XX-YY R.C.  Locations where À Á , and  are displayed as Displays the outdoor unit sub-bus address which is shown in Fig. 1. currently selected. XX = Outdoor system address on main bus line (1 –...
  • Page 92 Mini VRF SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller n 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. Display of unit Nos.

  • Page 93: Monitoring Operations

    Mini VRF SYSTEM 4. Monitoring Operations Outdoor Unit Maintenance Remote Controller Display the indoor unit and outdoor unit sensor temperatures. <Operating procedure> Press and hold the (Check) button and À buttons simultaneously for 4 seconds or longer to engage temperature monitor mode. During temperature monitoring, is illuminates.
  • Page 94 Mini VRF SYSTEM 4. Monitoring Operations Outdoor Unit Maintenance Remote Controller Display of unit No. 1 (main unit) Description Remarks Indoor unit intake temp. (TA) °C Indoor unit heat exchanger temp. E1 (E1) °C — Indoor unit Indoor unit heat exchanger temp. E3 (E3) °C Discharge air temp.

  • Page 95: 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> À...

  • Page 96: Mode Settings

    2WAY SYSTEM Mini VRF SYSTEM 6. Mode Settings 6. Mode Settings Outdoor Unit Maintenance Remote Controller Outdoor Unit Maintenance Remote Controller Display of fi rst 3 digits Setting mode 1 <Operating procedure> Press and hold the (Check) button and (Ventilation) button simultaneously for 4 seconds or longer.

  • Page 97: Remote Controller Functions

    Mini VRF SYSTEM Contents Remote Controller Functions 5. REMOTE CONTROLLER FUNCTIONS 1. Simple Settings Function ..........5-2 2.

  • Page 98: Simple Settings Function

    Mini VRF SYSTEM 1. Simple Settings Function Remote Controller Functions Simple Settings Function This allows the filter lifetime, operating mode 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. When simple settings mode is engaged, operation stops at the individual or group-control indoor unit to which the remote controller for simple settings is connected.
  • Page 99 Mini VRF SYSTEM 1. Simple Settings Function Remote Controller Functions <Procedure of CZ-RTC5B> Keep pressing the 20:30 (THU) buttons simultaneously for 4 or more seconds. The “Maintenance func” screen appears on the LCD display. Maintenance func 20:30 (THU) START 1. Outdoor unit error data 2.
  • Page 100 Mini VRF SYSTEM 1. Simple Settings Function Remote Controller Functions <Procedure of CZ-RTC4> (1) Press and hold the buttons simultaneously for 4 seconds or longer. (2) “ ”, unit No. “ ” (or “ ” in the case ° ° of group control), item code “...
  • Page 101 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 (filter life time) 0003 5,000 hours 0004 10,000 hours 0005...
  • Page 102 Mini VRF SYSTEM 1. Simple Settings Function Remote Controller Functions Simple setting items Item code Item Description Filter sign ON time setting Changes the indoor unit filter lifetime when a high-performance filter or other (filter lifetime) optional product is installed. Reduces the filter sign ON time to 1/2 of the standard time (setting at the time of Degree of filter fouling shipping) for cases when filter fouling is more severe than normal.
  • Page 103 Mini VRF SYSTEM 1. Simple 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 104 Mini VRF SYSTEM 1. Simple 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 105: Detailed Settings Function

    Mini VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions Detailed Settings Function 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. When detailed settings mode is engaged, operation stops at the individual or group-control indoor unit where the remote controller used for detailed settings is connected.
  • Page 106 Mini VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions <Procedure of CZ-RTC5B> Keep pressing the buttons simultaneously for 4 or more seconds. 20:30 (THU) The “Maintenance func” screen appears on the LCD display. Maintenance func 20:30 (THU) 1. Outdoor unit error data START 2.
  • Page 107 Mini VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions <Procedure of CZ-RTC4> (1) Press and hold the buttons simultaneously for 4 seconds or longer. (2) “ ”, unit No. “ ”, item code “ ”, and ° ° settings data “ ”...
  • Page 108 2WAY SYSTEM Mini VRF SYSTEM 2. Detailed Settings Function 2. Detailed Settings Function Remote Controller Functions Remote Controller Functions List of Detailed Setting Items Setting data Item code Item Description Description Description Type 0001 4-Way Cassette (60×60) (U2, Y2) 0005 Slim Low Static Ducted (M1) 0008 Wall Mounted (K2)
  • Page 109 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 Shifts discharge temperature setting 10°C down –009 Shifts discharge temperature setting 9°C down Cooling discharge –008 Shifts discharge temperature setting 8°C down...
  • Page 110 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. Wired remote controller 0000 Not used.
  • Page 111 Mini VRF SYSTEM VRF SYSTEMS Indoor Unit 2. Detailed Settings Function 2. Detailed Settings Function Remote Controller Functions Setting data Item code Item Description Purpose Fan tap setting 0000 Standard (setting at shipment) (Fan tap change in order High ceiling setting 1 (Type U2) to prevent drop in air 0001 Air-flow blocking kit (when a duct is connected : Type U2)
  • Page 112 Mini VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions Setting data Item code Item Description 0000 Normal (Life of refrigerant leak sensor hasn’t expired) Refrigerant leak sensor 0001 Life of refrigerant leak sensor has expired life notification and 0002 Reset the life notification of refrigerant leak sensor in indoor unit (J04, J06) refrigerant leak alarm reset...
  • Page 113 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. Indoor unit address These must be set after installation if auto address setting is not performed.
  • Page 114 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 115 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 116: 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. <Function of CZ-RTC6 series> Stop the system before performing these steps. Keep pressing the buttons simultaneously for 4 or more seconds.
  • Page 117 2WAY SYSTEM Mini VRF SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions 3. Remote Controller Servicing Functions Remote Controller Functions <Function of CZ-RTC5B> Display of “maintenance function” screen Keep pressing the buttons simultaneously for 4 or more seconds. Maintenance func 20:30 (THU) The “Maintenance func”...
  • Page 118 Mini VRF SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions <Function of CZ-RTC4> List of Servicing Functions Functions Description Button operation Reset operation Unit status Operation with forced Press and hold the button for Test run 4 seconds or longer. thermostat ON Sensor Temperature display...
  • Page 119 Mini VRF SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions ■ ECONAVI Display When the appears on the LCD display, the state of the sensor unit can be checked in the following method. <Procedure of CZ-RTC5B> Keep pressing the buttons simultaneously for 4 or more seconds.
  • Page 120 Mini VRF SYSTEM VRF SYSTEMS Indoor Unit 3. Remote Controller Servicing Functions 3. Remote Controller Servicing Functions Remote Controller Functions Code no. Description ECONAVI sensor ECONAVI panel Data shows the status of the ECONAVI sensor. 0000: The sensor is not connected. 0001: The sensor can detect human motion.
  • Page 121 Mini VRF SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions Check of ECONAVI Operational Status The status of ECONAVI operation can be checked instantly. It is available to check the operation when installing the indoor unit. <Procedure of CZ-RTC5B> Keep pressing the Status info.
  • Page 122 2WAY SYSTEM Mini VRF SYSTEM 3. Remote Controller Servicing Functions 3. Remote Controller Servicing Functions Remote Controller Functions Remote Controller Functions Test Run Function Operates the unit with the thermostat forced ON. <Procedure of CZ-RTC5B> (1) Keep pressing the buttons simultaneously for 4 or more seconds. 20:30 (THU) The “Maintenance func”...
  • Page 123 Mini VRF SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions <Procedure of CZ-RTC4> (1) Press and hold the button for 4 seconds or longer. (2) “ ” appears on the remote controller LCD ° ° ° ° display. (3) Press the button to start the test run.
  • Page 124 Mini VRF SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions n Sensor Temperature Display Function (displayed regardless of whether unit is operating or stopped) Sensor info. 20:30 (THU) Unit no. Code no. Data The procedure below displays the sensor 0026 temperatures from the remote controller, indoor unit, 0028...
  • Page 125 Mini VRF SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions <Procedure of CZ-RTC4> (1) Press and hold the buttons simultaneously for 4 seconds or longer. ” (2) The unit No. “X-X” (main unit No.), item code “ ° ° (sensor address), and servicing monitor “...
  • Page 126 Mini VRF SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions ■ nanoe X Display When the appears on the remote controller (CZ-RTC5B), the status of the nanoe™ X can be checked in the following way. <Procedure of CZ-RTC5B> Switch On the earth leakage circuit breaker. Maintenance func 20:30 (THU) Wait until the remote control display returns to...
  • Page 127 Mini VRF SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions In the case of the nanoe™ X module status other than “Normal” or “Unsupported” If the menu “13. nanoe X” is not displayed or the module status becomes other than “Normal” or “Unsupported” even though the nanoe™...
  • Page 128 – MEMO – 5 - 32...

  • Page 129: Trouble Diagnosis

    2WAY SYSTEM Mini VRF SYSTEM Contents Contents Trouble Diagnosis Trouble Diagnosis 6. TROUBLE DIAGNOSIS 6. TROUBLE DIAGNOSIS 1. Contents of Remote Controller Switch Alarm Display ......6-2 2.

  • Page 130: Trouble Diagnosis

    1. Contents of Remote Controller 2WAY SYSTEM 1. Contents of Remote Controller Mini VRF SYSTEM Trouble Diagnosis Switch Alarm Display Trouble Diagnosis Switch Alarm Display Blinking: OFF: Wired Wireless remote remote controller control receiver display display Possible cause of malfunction Serial Remote controller is detecting Error in receiving serial communication signal.

  • Page 131: Contents Of Remote Controller Switch Alarm Display

    1. Contents of Remote Controller 1. Contents of Remote Controller Mini VRF SYSTEM 2WAY SYSTEM Trouble Diagnosis Trouble Diagnosis Switch Alarm Display Switch Alarm Display Blinking: OFF: Wired Wireless remote remote controller control receiver display display Possible cause of malfunction Thermistor fault Outdoor thermistor is either Compressor intake temp.

  • Page 132: Outdoor Unit Control Panel Led Display

    Mini VRF SYSTEM 2. Outdoor Unit Control Panel LED Display Trouble Diagnosis : ON : Blinking : OFF) LED (RED) Display meaning After the power is turned ON (and auto address setting is not in progress), no communication with the indoor units in that system is possible. (Both ON) After power is turned ON (and auto address setting is not in progress), one or more indoor units are confirmed in that system;...

  • Page 133: Mini Vrf Alarm Codes

    Mini VRF SYSTEM 3. Mini VRF Alarm Codes Trouble Diagnosis Alarm code Alarm meaning Page Some indoor units do not respond to outdoor unit. Auto Address failed to start. Fewer indoor units are found in Auto Addressing than the setting on outdoor PCB. More indoor units are found in Auto Addressing than the setting on outdoor PCB.
  • Page 134 Mini VRF SYSTEM 3. 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 Outdoor unit failed to receive serial communication signals from indoor unit. Probable cause (1) The indoor unit power was cut OFF after initial communications were completed.
  • Page 135 Mini VRF SYSTEM 3. Mini VRF Alarm Codes Trouble Diagnosis E16 Alarm Alarm code Alarm meaning Auto address setting alarm (too many units) Alarm conditions • The number of indoor units was too many when auto address setting was performed. •...

  • Page 136: Mini Vrf Alarm Codes

    Mini VRF SYSTEM 3. Mini VRF Alarm Codes Trouble Diagnosis F04 Alarm Alarm code Alarm meaning Compressor discharge temperature sensor has failure. (DISCH) Alarm conditions (1) Discharge temp. of 100°C or higher was detected 30 minutes or more after that compressor stopped operating.
  • Page 137 Mini VRF SYSTEM 3. Mini VRF Alarm Codes Trouble Diagnosis F06 Alarm Alarm code Alarm meaning Gas temperature sensor trouble at outdoor heat exchanger Alarm conditions (1) Short circuit (A/D step is 10 steps or less) (2) Open circuit (A/D step is 1014 steps or more) Probable cause (1) Sensor malfunction (including connector) (2) The Outdoor Unit Control PCB malfunction...
  • Page 138 3WAY SYSTEM Mini VRF SYSTEM 3. Mini VRF Alarm Codes 4. 3W AY Alarm Codes Trouble Diagnosis Trouble Diagnosis F16 Alarm Alarm code Alarm meaning High-pressure sensor malfunction Alarm conditions High-pressure sensor disconnected or open circuit High-pressure sensor detected over 3.9MPa (In case of renewal setting : 3.15MPa) continuously for 30 minutes while outdoor units stopped.

  • Page 139: Way Alarm Codes

    2WAY SYSTEM Mini VRF SYSTEM 4. 2WAY Alarm Codes 3. Mini VRF Alarm Codes Trouble Diagnosis Trouble Diagnosis F17 Alarm Alarm code Alarm meaning Low-pressure sensor trouble Alarm conditions (1) Sensor short circuit (2) Sensor open circuit Probable cause (1) Sensor malfunction (including connector) (2) The Outdoor Unit Control PCB malfunction Check (1) Measure the sensor resistance.
  • Page 140 2WAY SYSTEM Mini VRF SYSTEM 4. 2WAY Alarm Codes 3. Mini VRF Alarm Codes Trouble Diagnosis Trouble Diagnosis H03 Alarm Alarm code Alarm meaning Compressor current sensor is disconnected or shorted. Alarm conditions When the frequency of compressor (INV) is over 35Hz and the secondary current is over 9.8A, the primary current detected lower than 0.7A.
  • Page 141 Mini VRF SYSTEM 3WAY SYSTEM 3. Mini VRF Alarm Codes 4. 3WAY Alarm Codes Trouble Diagnosis Trouble Diagnosis H06 Alarm Alarm code Alarm meaning Abnormal decrease of low-pressure Alarm conditions • Low-pressure sensor detects lower than 0.06MPa continuously for 2 minutes or lower than 0.02MPa for just a moment.
  • Page 142 Mini VRF SYSTEM 3. Mini VRF Alarm Codes Trouble Diagnosis H31 Alarm Alarm code Alarm meaning Compressor HIC has failure. HIC is overcurrent or overheat. VDC is undervoltage or overvoltage. Alarm conditions This alarm occurs when the microcomputer identifies a trouble signal (indicating abnormal HIC temperature or other trouble) from the HIC.
  • Page 143 Mini VRF SYSTEM 3. Mini VRF Alarm Codes Trouble Diagnosis L04 Alarm Alarm code Alarm meaning Outdoor system address duplication Alarm conditions Communication by inter-unit control wiring was received that contained the same address as that unit 5 times or more within 3 minutes. Probable cause Incorrect outdoor system address settings Check...
  • Page 144 2WAY SYSTEM Mini VRF SYSTEM 4. 2WAY Alarm Codes 3. Mini VRF Alarm Codes Trouble Diagnosis Trouble Diagnosis P03 Alarm Alarm code Alarm meaning Compressor discharge temperature trouble Alarm conditions Compressor : Pre-trip stops when the temperature exceeds 106°C. * The alarm occurs when pre-trip stop occurs more than once. However, the pre-trip counter is cleared if the compressor operates continuously for a specified length of time (more than 2.5 minutes).
  • Page 145 3WAY SYSTEM Mini VRF SYSTEM 4. 3W AY Alarm Codes 3. Mini VRF Alarm Codes Trouble Diagnosis Trouble Diagnosis P04 Alarm Alarm code Alarm meaning High-pressure switch activated. Alarm conditions The operation of the electronic circuit in the high-pressure switch may short-circuit the terminal depending on the pressure.
  • Page 146 (14) Check whether the wiring from the solenoid valve kit is actually connected to the different indoor unit. Mini VRF SYSTEM (15) The system is that the multiple indoor units are connected at only one solenoid valve kit and also multiple 3.
  • Page 147 Mini VRF SYSTEM 3. Mini VRF Alarm Codes Trouble Diagnosis P08 Alarm Alarm code Alarm meaning R32 refrigerant leak detection Alarm conditions Refrigerant sensor of the indoor unit or R32 refrigerant leakage detection sensor detected R32 refrigerant. Probable cause (1) Connection failure on "Refrigerant tube connection part", or refrigerant leakage caused by crack on "Indoor unit's inside tube"...
  • Page 148 Mini VRF SYSTEM 3. Mini VRF Alarm Codes Trouble Diagnosis P14 Alarm Alarm code Alarm meaning R32 refrigerant leak detection Alarm conditions One of the indoor units connected to the outdoor unit has detected R32 refrigerant leak. Probable cause (1) Connection failure on "Refrigerant tube connection part", or refrigerant leakage caused by crack on "Indoor unit's inside tube"...
  • Page 149 If “No”, see “3-2”. Mini VRF SYSTEM 3-2 Since there is no error, see what happens. 3. Mini VRF Alarm Codes replace board 3-3 Indoor control board defective Trouble Diagnosis Example — Notes — P16 Alarm Alarm code Alarm meaning Compressor secondary current is overcurrent.
  • Page 150 Mini VRF SYSTEM Mini VRF SYSTEM Check Check the valve, mechanical valve and outdoor fan. 3. Mini VRF Alarm Codes Trouble Diagnosis Trouble Diagnosis Correction — Example — — Notes P22 Alarm Alarm code Alarm meaning Outdoor unit fan motor has failure. Alarm conditions Fan motor start failure, fan motor Hall IC input failure Probable cause...

  • Page 151: Inspection And Characteristics Of Parts

    Mini VRF SYSTEM 4. Inspection and Characteristics of Parts Trouble Diagnosis (1) High-Pressure Switch (63PH) 63PH Disconnect the CN-63PH connector (3P, red) from the outdoor unit control panel. Measure the resistance between socket pins 1 and 3. The resistance is OK if the result is 0 Ω. (2) Electronic Control Valve (MOV1, MOV4) After removing the connector from the PCB, use the following methods to check the valves.
  • Page 152 Mini VRF SYSTEM 2WAY VRF SYSTEM 4. Inspection and Characteristics of Parts Trouble Diagnosis 8. Thermister Characteristics Curve Trouble Diagnosis (4) Indoor suction air (room) temp. sensor (TA) Indoor discharge air temp. sensor (BL) Temperature (˚C) (5) Indoor coil temp. sensor (E1, E3) Temperature (˚C) Temperature (˚C) 6 - 24...

  • Page 153: Inspection And Characteristics Of Parts

    2WAY SYSTEM Mini VRF SYSTEM 6. Inspection and Characteristics of Parts 4. Inspection and Characteristics of Parts Trouble Diagnosis Trouble Diagnosis (6) Coil Resistance of Compressor Motor unit : ohm Compressor 9VD650XAA21 Type U - V 0.735 Resistance U - W 0.715 (at 20°C) V - W...

  • Page 154: Test Pin

    2WAY SYSTEM Mini VRF SYSTEM 7. Test Pin 5. Test Pin Trouble Diagnosis Trouble Diagnosis When the test pin on the outdoor unit control PCB is short-circuited, each part can be operated individually. • After turning OFF the main unit power, short-circuit the test pin (black), then turn the power back ON. Output is performed in the sequence shown in the table below, for 0.5 seconds each.

  • Page 155: Symptom: Thermostat In Off Continues Or Cycles Off & On Too Frequently

    Mini VRF SYSTEM 6. Symptom: Thermostat in OFF continues or 6. Symptom: Thermostat in OFF continues or Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis cycles OFF & ON too frequently cycles OFF & ON too frequently How to detect abnormality •...
  • Page 156 – MEMO – 6 - 28...

  • Page 157: Test Run

    Mini VRF SYSTEM Contents Test Run 7. TEST RUN 1. Preparing for Test Run ......................7-2 2. Test Run Procedure ......................7-3 3. Outdoor Unit Control PCB Setting ..................7-4 4. Auto Address Setting ......................7-8 5. Test Run Using the Remote Controller ................7-18 6.

  • Page 158: Preparing For Test Run

    Mini VRF SYSTEM 1. Preparing for Test Run Test Run 1. Preparing for Test Run  Before attempting to start the air conditioner, check the following. (6) Both the gas and liquid tube service valves are (1) All loose matter is removed from the cabinet open.

  • Page 159: Test Run Procedure

    Mini VRF SYSTEM 2. Test Run Procedure Test Run 2. Test Run Procedure Note: Recheck before the test run. These settings are not made on the indoor unit <Outdoor unit control PCB (Main)> control PCB. Number of indoor units Set the number of indoor units. setting switch (SW3 and SW4) CASE 1...

  • Page 160: Outdoor Unit Control Pcb Setting

    Mini VRF SYSTEM 3. Outdoor Unit Control PCB Setting Test Run 3. Outdoor Unit Control PCB Setting LED 2 LED 1 SW 2 SW 1 SW 4 SW 3 A. ADD STOP MODE CN-TERMINAL CN-SILENT CN-ROM CN-OC CN-EMG CN-RC For detailed drawing, see the page 7-6. 7 - 4...
  • Page 161 Mini VRF SYSTEM 3. Outdoor Unit Control PCB Setting Test Run  Examples of the number of indoor units settings (SW3, SW4) Indoor unit setting (SW3) Indoor unit setting (SW4) Number of indoor units (1P DIP switch) (Rotary switch) 1 - 9 unit Set to 1 - 9 (factory setting : 1 unit) 10 - 16 unit...
  • Page 162 Mini VRF SYSTEM 3. Outdoor Unit Control PCB Setting Test Run LED 2 LED 1 SW 2 SW 1 SW 4 SW 3 A. ADD STOP MODE CN-TERMINAL CN-SILENT CN-ROM CN-OC CN-EMG CN-RC 7 - 6...
  • Page 163 Mini VRF SYSTEM 3. Outdoor Unit Control PCB Setting Test Run  Name and Function of Each Switch on Outdoor Unit Control PCB Function Switch Remarks Changes to cooling/heating mode. When in normal operation: When short circuited the COOL side, indoor unit operation in the same refrigerant system changes to MODE pin all cooling mode.

  • Page 164: Auto Address Setting

    Mini VRF SYSTEM 4. Auto Address Setting Test Run 4. Auto Address Setting Example: Basic Wiring Diagram (1) • Case of no link wiring 3P terminating (Inter-unit control wiring is not connected to a multiple system.) resistance pin Indoor unit address setting is possible without starting the compressor. (SHORT side) * It is not necessary to control the Unit 1 setting (outdoor main unit)
  • Page 165 Mini VRF SYSTEM 4. Auto Address Setting Test Run Example: Basic Wiring Diagram (2) • Case of link wiring * See “ATTENTION!”. No. 1 refrigerant system Setting of terminal pin (CN-TERMINAL) Refrigerant circuit No. 1 Unit 1 setting (outdoor main unit) Unit No.
  • Page 166 Mini VRF SYSTEM 4. Auto Address Setting Test Run  Final check before operation Between conductors Final check must be done under the conditions of inter-outdoor unit control Wire wiring connected to the centralized control system and the resistor between conductors must be measured by a tester.
  • Page 167 Mini VRF SYSTEM 4. Auto Address Setting Test Run Auto Address Setting from the Remote Controller Auto Address Setting from the Wired Remote Controller (CZ-RTC6 series) (1) Keep pressing the buttons simultaneously for 4 or more seconds. The “Maintenance func” screen appears on the LCD display. Maintenance func XX / XX ECONAVI...
  • Page 168 Mini VRF SYSTEM 4. Auto Address Setting Test Run Auto Address Setting from the High-spec Wired Remote Controller (CZ-RTC5B) (1) Keep pressing the buttons simultaneously for 4 or more seconds. 20:30 (THU) The “Maintenance func” screen appears on the LCD display. Maintenance func 20:30 (THU) 1.
  • Page 169 Mini VRF SYSTEM 4. Auto Address Setting Test Run Auto Address Setting* from the Remote Controller (CZ-RTC4) * Auto address setting in Cooling mode cannot be done from the remote controller. NOT E  Selecting each refrigerant system individually for auto address setting ...
  • Page 170 Mini VRF SYSTEM 4. Auto Address Setting Test Run Display During Auto Address Setting  On the surface of outdoor unit control PCB * Do not short circuit the A.ADD pin again during auto address setting. LEDs 1 and 2 go out and address setting is interrupted. * When auto address setting is normally completed, both LEDs 1 and 2 go out.
  • Page 171 Mini VRF SYSTEM 4. Auto Address Setting Test Run Checking the indoor unit addresses Use the remote controller to check the indoor unit address. CZ-RTC6 series (Wired Remote Controller) (1) Keep pressing the buttons simultaneously for 4 or more seconds. The “Maintenance func”...
  • Page 172 Mini VRF SYSTEM 4. Auto Address Setting Test Run CZ-RTC5B (High-spec wired remote controller) (1) Keep pressing the buttons 20:30 (THU) simultaneously for 4 or more seconds. The “Maintenance func” screen appears on the LCD display. Maintenance func 20:30 (THU) START 1.
  • Page 173 Mini VRF SYSTEM 4. Auto Address Setting Test Run CZ-RTC4 (Timer remote controller) (1) Press and hold the button and button for 4 seconds or Number changes to indicate which indoor unit is currently selected. longer (simple settings mode). (2) “ALL” is displayed on the remote controller. Indoor unit address (3) Next, press the button.

  • Page 174: Test Run Using The Remote Controller

    Mini VRF SYSTEM 5. Test Run Using the Remote Controller Test Run 5. Test Run Using the Remote Controller CZ-RTC6 series (Wired Remote Controller) This mode places a heavy load on the machines. Therefore use it only when performing the test run. (1) Keep pressing the buttons simultaneously for 4 or more seconds.
  • Page 175 Mini VRF SYSTEM 5. Test Run Using the Remote Controller Test Run CZ-RTC5B (High-spec wired remote controller) This mode places a heavy load on the machines. Therefore use it only when performing the test run. 20:30 (THU) (1) Keep pressing the buttons simultaneously for 4 or more seconds.
  • Page 176 Mini VRF SYSTEM 5. Test Run Using the Remote Controller Test Run CZ-RTC4 (Timer remote controller) This mode places a heavy load on the machines. Therefore use it only when performing the test run. (1) Press the remote controller button for 4 seconds or longer. Then press the button.

  • Page 177: Caution For Pump Down

    6. Caution for Pump Down Mini VRF SYSTEM Test Run 7. Self-Diagnosis Function Table and Contents of Alarm Display 6. Caution for Pump Down Pump down means refrigerant gas in the system is returned to the outdoor unit. Pump down is used when the unit is to be moved, or before servicing the refrigerant circuit. ...
  • Page 178 Mini VRF SYSTEM 7. Self-Diagnosis Function Table and Contents of Alarm Display Test Run • • Auto address setting begins but finishes improperly. Symptom Cause and countermeasure • • Soon after a few seconds or after a few minutes, the alarm See “Contents of Alarm Display”...
  • Page 179 Mini VRF SYSTEM 7. Self-Diagnosis Function Table and Contents of Alarm Display Test Run • Alarm display can be checked by the outdoor maintenance remote controller. When operating, see Section 6. Alarm display can also be checked by number of blinking of LEDs 1 and 2 on outdoor unit control PCB. (See “How to know LEDs 1 and 2 alarm display on outdoor unit control PCB”...
  • Page 180 Mini VRF SYSTEM 7. Self-Diagnosis Function Table and Contents of Alarm Display Test Run Remote control display Alarm contents Indoor unit address is not set. Capacity setting of indoor unit is not correct. Capacity setting of outdoor unit is not correct. Indoor unit model does not match with outdoor unit.
  • Page 181 Mini VRF SYSTEM 7. Self-Diagnosis Function Table and Contents of Alarm Display Test Run Wired remote Detected contents control display Indoor unit heat exchanger liquid temperature sensor <<F01>> has failure. (E1) Indoor unit heat exchanger gas temperature sensor <<F03>> has failure. (E3) Indoor unit sensor has failure Indoor suction air (room) temperature sensor has <<F10>>...
  • Page 182 Mini VRF SYSTEM 7. Self-Diagnosis Function Table and Contents of Alarm Display Test Run ATTENTION! Adjustment of terminating resistance (pin) is necessary. Communication failure will occur unless adjustment is made correctly. • • Terminating resistance (pin) is mounted on outdoor unit control PCB. •...
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