Panasonic U-4LE1E5 Service Manual
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Panasonic U-4LE1E5 Service Manual

Panasonic U-4LE1E5 Service Manual

Mini vrf system
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SERVICE MANUAL

Model No.

Outdoor Unit

Class
4HP
U-4LE1E5
Model Name
U-4LE1E8
HP = horsepower

Indoor Unit

Class
15
S-22MU1E51
4-Way Cassette
U1
S-22MU1E5
Y1
4-Way Cassette 60×60
S-22MY1E5
Y2
4-Way Cassette 60×60
S-22MY2E5
2-Way Cassette
L1
S-22ML1E5
D1
1-Way Cassette
S-22MF1E5
Low Silhouette Ducted
F1
S-22MF2E5
Low Silhouette Ducted
F2
M1
Slim Low Static Ducted
S-15MM1E5
S-22MM1E5
T1
Ceiling
K1
Wall Mounted
S-22MK1E5
S-22MK2E5
K2
Wall Mounted
Concealed Floor
R1
S-22MR1E5
Standing
P1
Floor Standing
S-22MP1E5
High Static Pressure
E1
Ducted
85464849295004
5HP
6HP
U-5LE1E5
U-6LE1E5
U-5LE1E8
U-6LE1E8
22
28
36
S-28MU1E51
S-36MU1E51
S-45MU1E51
S-28MU1E5
S-36MU1E5
S-45MU1E5
S-28MY1E5
S-36MY1E5
S-45MY1E5
S-28MY2E5
S-36MY2E5
S-45MY2E5
S-28ML1E5
S-36ML1E5
S-45ML1E5
S-28MD1E5
S-36MD1E5
S-45MD1E5
S-28MF1E5
S-36MF1E5
S-45MF1E5
S-28MF2E5
S-36MF2E5
S-45MF2E5
S-28MM1E5
S-36MM1E5
S-45MM1E5
S-36MT1E5
S-45MT1E5
S-28MK1E5
S-36MK1E5
S-45MK1E5
S-28MK2E5
S-36MK2E5
S-28MR1E5
S-36MR1E5
S-45MR1E5
S-28MP1E5
S-36MP1E5
S-45MP1E5
Mini VRF System
45
56
60
S-56MU1E51
S-60MU1E51
S-73MU1E51
S-56MU1E5
S-73MU1E5
S-56MY1E5
S-56MY2E5
S-56ML1E5
S-73ML1E5
S-56MD1E5
S-73MD1E5
S-56MF1E5
S-73MF1E5
S-56MF2E5
S-60MF2E5
S-73MF2E5
S-56MM1E5
S-56MT1E5
S-73MT1E5
S-56MK1E5
S-73MK1E5
S-56MR1E5
S-71MR1E5
S-56MP1E5
S-71MP1E5
S-73ME1E5
Order No. SM830195-11CE
73
90
106
S-90MU1E51
S-106MU1E51
S-140MU1E51
S-106MU1E5
S-140MU1E5
S-90MF1E5
S-106MF1E5
S-140MF1E5
S-90MF2E5
S-106MF2E5
S-140MF2E5
S-106MT1E5
S-140MT1E5
S-106MK1E5
S-106ME1E5
S-140ME1E5
REFERENCE NO.
140
160
S-160MU1E51
S-160MU1E5
S-160MF1E5
S-160MF2E5
SM830195-04

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Summary of Contents for Panasonic U-4LE1E5

  • Page 1: Service Manual

    Order No. SM830195-11CE SERVICE MANUAL Mini VRF System Model No. Outdoor Unit Class U-4LE1E5 U-5LE1E5 U-6LE1E5 Model Name U-4LE1E8 U-5LE1E8 U-6LE1E8 HP = horsepower Indoor Unit Class S-22MU1E51 S-28MU1E51 S-36MU1E51 S-45MU1E51 S-56MU1E51 S-60MU1E51 S-73MU1E51 S-90MU1E51 S-106MU1E51 S-140MU1E51 S-160MU1E51 4-Way Cassette...

  • Page 2: Special Precautions

    Circuit breaker must be incorporated in the fixed wiring equipment is connected only to a supply with a short- in accordance with the wiring regulations. circuit power Ssc greater than or equal to the value in the table. U-4LE1E5 U-5LE1E5 U-6LE1E5 Circuit breaker 30 A...
  • Page 3 When Installing… When Servicing • Turn the power OFF at the main power box Select an installation location which is rigid and strong (mains) before opening the unit to check or repair enough to support or hold the unit, and select a location electrical parts and wiring.

  • Page 4: Check Of Density Limit

    Check of Density Limit The standards for minimum room volume are as follows. (1) No partition (shaded portion) The room in which the air conditioner is to be installed requires a design that in the event of refrigerant gas leaking out, its density will not exceed a set limit. The refrigerant (R410A), which is used in the air conditioner, is safe, without the toxicity or combustibility of ammonia, and is not restricted by laws imposed to protect the ozone layer.

  • Page 5: Table Of Contents

    CONTENTS Section 1: CONTROL FUNCTIONS .........1-1 1.
  • Page 6 – MEMO –...

  • Page 7: Control Functions

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

  • Page 8: Introduction

    Mini VRF SYSTEM Control Functions 1. Introduction 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 9: Compressor Control

    Mini VRF SYSTEM Control Functions 2. Compressor Control 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 Control Functions 2. Compressor Control 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 Control Functions 2. Compressor Control 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 57.5°C 57.4°C Horsepower decrease (Area C) 51.6°C 51.5°C Horsepower increase prohibited (Area B) 49.0°C...
  • Page 12 If the condensation temperature (Tc) enters area D and the thermostat turns OFF, the next time the compres- sor starts it may restart from a lower capacity. Mini VRF SYSTEM Control Functions When the area changes to area C, area C is considered to be area B for control purposes for the first 6 min- 2.
  • Page 13 3-phase Model unit : Amp. hp : horsepower Mini VRF SYSTEM 4 hp 5 hp 6 hp Control Functions Stop*1 10.5~ 12.0~ 14.0~ 2. Compressor Control Down*2 8.5~10.5 10.0~12.0 12.0~14.0 Not up*3 7.5~8.5 9.0~10.0 11.0~12.0 Followed by normal control ~7.5 ~9.0 ~11.0 <Heating>...

  • Page 14: Special Controls

    Mini VRF SYSTEM Mini VRF SYSTEM Control Functions Control Functions 3. Special Controls 3. Special Controls 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.
  • Page 15 Mini VRF SYSTEM Mini VRF SYSTEM Control Functions Control Functions 3. Special Controls 3. Special Controls (2) Control in the Heating Mode (2-1) Discharge temperature: less than 30°C Min. 2 minutes 30 seconds to Max. 23 minutes Control hour (Discharge degree-of-overheating: Td* 1 - HPT* 2 > 12 K* 3 ) Compressor Frequency 54Hz Outdoor unit...
  • Page 16 Mini VRF SYSTEM Control Functions 3. Special Controls 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 17 Mini VRF SYSTEM Mini VRF SYSTEM Control Functions Control Functions 3. Special Controls 3. Special Controls 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 °C Condition 1: Defrosting operation...

  • Page 18: Other Control

    4. Other Control Mini VRF SYSTEM 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 19: Outdoor Fan Control

    Mini VRF SYSTEM Control Functions 7. Outdoor Fan Control 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 20: Indoor Unit Electronic Control Valve (Motor Valve) Control

    Mini VRF SYSTEM Control Functions 8. Indoor Unit Electronic Control Valve (Motor Valve) Control INDOOR UNIT 8-1. During Normal Control During Cooling mode operation MOV position (pulses) Outdoor unit operating Outdoor unit stopped Stop 20 pulses 20 pulses 20 pulses 20 pulses Thermostat OFF 20 pulses...

  • Page 21: Indoor Special Control

    Mini VRF SYSTEM 8. Indoor Unit Electronic Control Valve (Motor 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) Thermostat ON Performs SH control Cooling Thermostat OFF Cooling 4-way valve...
  • Page 22 Mini VRF SYSTEM Mini VRF SYSTEM Control Functions Control Functions 9. Indoor Special Control 9. Indoor Special Control 9-3. Indoor Fan Speed Control CCU intervenes in fan control of the indoor unit according to the state at the operating mode below. The priority order of fan control by CCU is higher than that of indoor unit’s.
  • Page 23 Mini VRF SYSTEM Mini VRF SYSTEM Control Functions Control Functions 9. Indoor Special Control 9. Indoor Special Control 9-4. Drain Pump control CCU intervenes in drain pump control of the indoor unit according to the setting in EEPROM in the outdoor unit. The drain pump operates from CCU control at the following condition.
  • Page 24 Mini VRF SYSTEM Mini VRF SYSTEM Control Functions Control Functions 9. Indoor Special Control 9. Indoor Special Control 9-5. Discharge air temperature control For Type F1, F2, M1, E1 indoor units, discharge air temperature is controlled from the CCU to prevent condensation on duct surface in cooling operation.

  • Page 25: 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 106°C. If the discharge temperature reaches 106°C, then the compressor stops. If the discharge temperature reaches 106°C 4 times repeatedly after restart, an alarm occurs.

  • Page 26: Pressure Sensor Failure

    11. Current Protection Mini VRF SYSTEM 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 when a missing phase or overcurrent (48 A) is detected when the inverter compressor starts.

  • Page 27: Servicing And Maintenance Functions

    Mini VRF SYSTEM Mini VRF SYSTEM Control Functions Control Functions 14. Servicing and Maintenance Functions 14. Servicing and Maintenance Functions The below functions are available, and are selected by the outdoor unit EEPROM settings. 14-1. Slime Countermeasure: EEPROM 0C (set only on the main unit) This setting controls the operation of the drain pump.

  • Page 28: Demand Control

    Mini VRF SYSTEM Mini VRF SYSTEM Control Functions Control Functions 15. Demand Control 15. Demand Control 15-1. Demand Control Demand terminal block (optional CZ-CAPDC3) or Seri-Para I/O unit (optional CZ-CAPDC2) must be connected in order to perform demand control. The current limitation values can be set by changing either contact. Demand terminal block Seri-Para I/O unit Control...

  • Page 29: Detailed Settings In Eeprom Of Outdoor Unit

    Mini VRF SYSTEM Control Functions 16. Detailed Settings in EEPROM of Outdoor Unit Never use the DN code unlisted in the following table. (P) : Factory preset mode Item Setting No. 0=No sensor & control (P) 1=Sensor & control Operation for using snowfall sensor 2=No sensor &...
  • Page 30 Mini VRF SYSTEM Control Functions 16. Detailed Settings in EEPROM of Outdoor Unit Never use the DN code unlisted in the following table. (P) : Factory preset mode 4A Forced defrosting (SILENT pin action) 0=Silent mode (P) 1=Forced defrosting -7=-7°C -6=-6°C ,,,,, Condensation temperature adjustment 0=0°C (P) ,,,,,...

  • Page 31: Outdoor Unit Repair Procedures

    Mini VRF SYSTEM Outdoor Unit Repair Procedures Contents 2. OUTDOOR UNIT REPAIR PROCEDURES Layout Diagram: Sensors and solenoid valves ....... . . 2-2 1.

  • Page 32: Layout Diagram: Sensors And Solenoid Valves

    Mini VRF SYSTEM Mini VRF SYSTEM Outdoor Unit Repair Procedures Outdoor Unit Repair Procedures Layout Diagram: Sensors and solenoid valves Layout Diagram: Sensors and solenoid valves (4-way valve) (suction thermistor) (electronic motor-operated valve) Front side Front side (condenser 1 thermistor) 2 - 2 2- 2...

  • Page 33: Removing Panels

    Mini VRF SYSTEM Mini VRF SYSTEM Outdoor Unit Repair Procedures Outdoor Unit Repair Procedures 1. Removing Panels 1. Removing Panels (1) Front panel removal (Fig. 2-1) • Remove the front panel (remove 3 screws). (2) Cover A removal (Fig. 2-1) •...

  • Page 34: Discharging Oil In Compressor

    Mini VRF SYSTEM Outdoor Unit Repair Procedures 2. 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. Refer to “7. Compressor” for detailed procedures. 2-1.

  • Page 35: Recovering Refrigerant

    Mini VRF SYSTEM Mini VRF SYSTEM Outdoor Unit Repair Procedures Outdoor Unit Repair Procedures 3. Recovering Refrigerant 3. Recovering Refrigerant 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 36 Mini VRF SYSTEM Outdoor Unit Repair Procedures 3. Recovering Refrigerant 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 37 Mini VRF SYSTEM Outdoor Unit Repair Procedures 3. Recovering Refrigerant 3-2-1. Cooling operation (for all units) Short-circuit the TEST pin (CN-TEST) 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 38 Mini VRF SYSTEM Outdoor Unit Repair Procedures 3. Recovering Refrigerant Manifold gauge Refrigerant recovery unit Refrigerant Ball valve recovery cylinder (field supply) Gas tube Service port Indoor unit Outdoor unit Liquid tube Fig. 2-4 2 - 8...
  • Page 39 Mini VRF SYSTEM Mini VRF SYSTEM Outdoor Unit Repair Procedures Outdoor Unit Repair Procedures 3. Recovering Refrigerant 3. Recovering Refrigerant 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 40: Checking For Leakage After Repair

    Mini VRF SYSTEM Mini VRF SYSTEM Outdoor Unit Repair Procedures Outdoor Unit Repair Procedures 4. Checking for Leakage After Repair 4. Checking for Leakage After Repair 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.

  • Page 41: Evacuating System

    Mini VRF SYSTEM Mini VRF SYSTEM Outdoor Unit Repair Procedures Outdoor Unit Repair Procedures 5. Evacuating System 5. Evacuating System 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.

  • Page 42: Pumping Out Refrigerant From Outdoor Unit

    Mini VRF SYSTEM Outdoor Unit Repair Procedures 6. Pumping Out Refrigerant from Outdoor Unit 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 43 Mini VRF SYSTEM Mini VRF SYSTEM Outdoor Unit Repair Procedures Outdoor Unit Repair Procedures 6. Pumping Out Refrigerant from Outdoor Unit 7. Pumping Out Refrigerant from Outdoor Unit NOTE To determine the completion of refrigerant recovery, follow the instructions that came with the refrigerant recovery unit.

  • Page 44: Compressor

    Mini VRF SYSTEM Outdoor Unit Repair Procedures 7. Compressor 7-1. 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 45 Mini VRF SYSTEM Outdoor Unit Repair Procedures 7. Compressor The connecting port includes a Schrader-type, push-to-release valve. CAUTION When disconnecting the hose, pressure will be applied from the refrigerant in the outdoor unit. Follow the instructions in “7-3. Dry Core Cleaning” and perform dry core cleaning of the outdoor unit that failed. 7-3.
  • Page 46 Mini VRF SYSTEM Mini VRF SYSTEM Outdoor Unit Repair Procedures Outdoor Unit Repair Procedures 7. Compressor 8. Compressor (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,...

  • Page 47: High Pressure Sensor

    Mini VRF SYSTEM Mini VRF SYSTEM 7. Compressor 8. Compressor Outdoor Unit Repair Procedures Outdoor Unit Repair Procedures 8. High Pressure Sensor 9. High Pressure Sensor Installation Prepare for installation. • Remove the rubber stopper and tube cap (welded) from the new compressor. Install the crankcase heater onto the compressor.
  • Page 48 – MEMO – 2 - 18...

  • Page 49: Outdoor Unit Maintenance Remote Controller

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

  • Page 50: Overview

    Mini VRF SYSTEM Outdoor Unit Maintenance Remote Controller 1. Overview OUTDOOR UNIT MAINTENANCE REMOTE [Service Checker Section] CONTROLLER (CZ-RTC2) for MINI VRF SYSTEM 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 51: Functions

    Mini VRF SYSTEM Outdoor Unit Maintenance Remote Controller 2. Functions 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 52: Ordinary Display Controls And Functions

    Mini VRF SYSTEM Outdoor Unit Maintenance Remote Controller 3. Ordinary Display Controls and Functions 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 RC (3P, BLU) PCB connector (3P, BLU)
  • Page 53 Mini VRF SYSTEM Outdoor Unit Maintenance Remote Controller 3. Ordinary Display Controls and Functions 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 54 Mini VRF SYSTEM Outdoor Unit Maintenance Remote Controller 3. Ordinary Display Controls and Functions n Display (functions) • Use the temperature setting buttons to change the item code. Item code Item Remarks À Á Outdoor unit alarm Alarm code display No.
  • Page 55 Mini VRF SYSTEM Outdoor Unit Maintenance Remote Controller 3. Ordinary Display Controls and Functions XX-YY R.C. (Fig. 3-3) Â 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 56 Mini VRF SYSTEM Outdoor Unit Maintenance Remote Controller 3. Ordinary Display Controls and Functions 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 57: Monitoring Operations

    Mini VRF SYSTEM Outdoor Unit Maintenance Remote Controller 4. Monitoring Operations 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 58 Mini VRF SYSTEM Mini VRF SYSTEM Outdoor Unit Maintenance Remote Controller Outdoor Unit Maintenance Remote Controller 4. Monitoring Operations 4. Monitoring Operations Display of unit No. 1 (main unit) Indoor unit intake temp. (TA) °C Indoor unit heat exchanger temp. E1 (E1) °C Indoor unit heat exchanger temp.

  • Page 59: Outdoor Unit Alarm History Monitor

    Mini VRF SYSTEM Outdoor Unit Maintenance Remote Controller 5. Outdoor Unit Alarm History Monitor • 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 60: Mode Settings

    Mini VRF SYSTEM Mini VRF SYSTEM Outdoor Unit Maintenance Remote Controller Outdoor Unit Maintenance Remote Controller 6. Mode Settings 6. Mode Settings Setting mode 1 Display of first 3 digits <Operating procedure> Press and hold the (CHECK) button and (VENTILATION) button simultaneously for 4 seconds or longer.
  • Page 61 Mini VRF SYSTEM Outdoor Unit Maintenance Remote Controller 6. Mode Settings n Setting mode 2 <Operating procedure> À Press and hold the (CHECK) button, button, and button simultaneously for 4 seconds or longer. Á Press the temperature setting buttons to change the item code.
  • Page 62 – MEMO – 3 - 14...

  • Page 63: Remote Controller Functions

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

  • Page 64: Simple Settings Function

    Mini VRF SYSTEM Remote Controller Functions 1. Simple Settings Function • 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 65 Mini VRF SYSTEM Remote Controller Functions 1. Simple Settings Function <Procedure of CZ-RTC3> 20:30 (THU) START CZ-RTC3 Fig. 4-2 Select the “Code no.” by pressing the button. Keep pressing the Change the “Code no.” by pressing the buttons simultaneously for 4 or more seconds. button.
  • Page 66 Mini VRF SYSTEM Remote Controller Functions 1. Simple Settings Function List of Simple Setting Items Setting data Item code Item Description 0000 Not displayed 0001 150 hours Filter sign ON time 0002 2,500 hours (filter life time) 0003 5,000 hours 0004 10,000 hours 0005...
  • Page 67 Mini VRF SYSTEM Remote Controller Functions 1. Simple Settings Function 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 68 Mini VRF SYSTEM Remote Controller Functions 1. Simple Settings Function 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 Mini VRF SYSTEM Remote Controller Functions Remote Controller Functions 1. Simple Settings Function 1. Simple Settings Function 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...

  • Page 70: Detailed Settings Function

    Mini VRF SYSTEM Remote Controller Functions 2. 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.
  • Page 71 Mini VRF SYSTEM Remote Controller Functions 2. Detailed Settings Function Setting the Flap Separately (When setting the CZ-RTC2) Press the timer time buttons to select 1) The 4-air outlet flap can be adjusted separately during the desired setting data. operation. When not adjusted separately, all flaps operate Flap position in the same manner.
  • Page 72 Mini VRF SYSTEM Remote Controller Functions 2. Detailed Settings Function <Procedure of CZ-RTC3> 20:30 (THU) START CZ-RTC3 Fig. 4-5 Select the “Code no.” by pressing the Keep pressing the button. buttons simultaneously for 4 or more seconds. Change the “Code no.” by pressing the The “Maintenance func”...
  • Page 73 Mini VRF SYSTEM Remote Controller Functions 2. Detailed Settings Function List of Detailed Setting Items Setting data Item code Item Description Description Description 4-Way Cassette (60×60) 0001 0002 2-Way Cassette (L1) 0003 1-Way Cassette (D1) (U1, Y1, Y2) Low Silhouette Ducted (F1, F2) High Static Pressure 0005 0006...
  • Page 74 Mini VRF SYSTEM Mini VRF SYSTEM Remote Controller Functions Remote Controller Functions 2. Detailed Settings Function 2. Detailed Settings Function Setting data Item code Item Description 0000 5 minutes (1B) Forced thermostat ON time 0001 4 minutes –010 –10°C –009 –9°C Cooling discharge –008...
  • Page 75 Mini VRF SYSTEM Remote Controller Functions 2. Detailed Settings Function 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 76 Mini VRF SYSTEM Remote Controller Functions 2. Detailed Settings Function 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 filter, oil guard panel, ammonia deodorizing static-pressure filter filter, optical regenerative deodorizing filter...
  • Page 77 Mini VRF SYSTEM Remote Controller Functions 2. Detailed Settings Function 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 78 Mini VRF SYSTEM Mini VRF SYSTEM Remote Controller Functions Remote Controller Functions 2. Detailed Settings Function 2. Detailed Settings Function Item code Item Description 1F (Upper limit) Cooling 20 (Lower limit) 21 (Upper limit) This setting changes the temperature range (upper limit and lower Heating 22 (Lower limit) Change to the remote...
  • Page 79 Mini VRF SYSTEM Remote Controller Functions 2. Detailed Settings Function (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 80 Mini VRF SYSTEM Remote Controller Functions 2WAY SYSTEM 2. Detailed Settings Function 2. Detailed Settings Function Remote Controller Functions Selecting the DC fan motor tap (when setting with the remote controller) <Procedure of CZ-RTC2> Stop the system before performing these steps. Press and hold the buttons simultaneously for 4 seconds or longer.
  • Page 81 Mini VRF SYSTEM Remote Controller Functions 2WAY SYSTEM 2. Detailed Settings Function 2. Detailed Settings Function Remote Controller Functions <Procedure of CZ-RTC3> Stop the system before performing these steps. 1 Keep pressing the buttons simultaneously for 4 or more seconds. Detailed settings 20:30 (THU) The “Maintenance func”...
  • Page 82 Mini VRF SYSTEM Remote Controller Functions 2. Detailed Settings Function Selecting the DC fan motor tap (when setting from the PCB) 4-Way Cassette type <Procedure> Stop the system before performing these steps. Open the electrical component box cover, then check the indoor unit control PCB. Connect the jumper connector (2P: yellow) which was supplied with the accessory to the correct connector pin on the indoor unit control PCB according to the setting number which was confirmed in Table 1 for DC Fan Motor Tap Settings.

  • Page 83: Remote Controller Servicing Functions

    2WAY SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions Mini VRF SYSTEM Remote Controller Functions 3. Remote Controller Servicing Functions • The remote controller includes a number of servicing functions. Use these as needed for test runs and inspections. <...
  • Page 84 2WAY SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions Mini VRF SYSTEM Remote Controller Functions 3. Remote Controller Servicing Functions <Function of CZ-RTC3> Display of "maintenance function" screen 1 Keep pressing the buttons simultaneously for 4 or more seconds. Maintenance func 20:30 (THU) The “Maintenance func”...
  • Page 85 2WAY SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions Mini VRF SYSTEM Remote Controller Functions 3. Remote Controller Servicing Functions Test Run Function Operates the unit with the thermostat forced ON. <Procedure of CZ-RTC2> Press and hold the button for 4 seconds or longer.
  • Page 86 Mini VRF SYSTEM Remote Controller Functions 3. Remote Controller Servicing Functions n 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 of CZ-RTC2>...
  • Page 87 Mini VRF SYSTEM Remote Controller Functions 3. Remote Controller Servicing Functions <Procedure of CZ-RTC3> Keep pressing the buttons simultaneously for 4 or more seconds. Sensor info. 20:30 (THU) The “Maintenance func” screen appears on the Unit no. Code no. Data LCD display.
  • Page 88 Mini VRF SYSTEM Mini VRF SYSTEM Remote Controller Functions Remote Controller Functions 3. Remote Controller Servicing Functions 3. Remote Controller Servicing Functions Sensor Temperature Relationship Table Sensor Sensor Location where Sensor type Sensor type address address sensor is installed Indoor unit heat exchanger Room temp.

  • Page 89: Trouble Diagnosis

    Mini VRF SYSTEM Trouble Diagnosis Contents 5. TROUBLE DIAGNOSIS 5. TROUBLE DIAGNOSIS 1. Contents of Remote Controller Switch Alarm Display ......5-2 2.

  • Page 90: Contents Of Remote Controller Switch Alarm Display

    Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 1. Contents of Remote Controller Switch Alarm Display 1. Contents of Remote Controller Switch Alarm Display Blinking: OFF: Wired Wireless remote remote controller control receiver display display Possible cause of malfunction Remote controller is Error in receiving serial communication signal Serial...
  • Page 91 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 1. Contents of Remote Controller Switch Alarm Display 1. Contents of Remote Controller Switch Alarm Display 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...

  • Page 92: Outdoor Unit Control Panel Led Display

    Mini VRF SYSTEM Trouble Diagnosis 2. Outdoor Unit Control Panel LED Display : ON : Blinking : OFF ) LED1 LED2 Display meaning D302 D303 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.

  • Page 93: Mini Vrf System Alarm Codes

    Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 4. Mini VRF System Alarm Codes 3. Mini VRF System Alarm Codes Alarms for outdoor units Alarm Alarm Meaning Code Remote Controller Reception Error Remote Controller Transmission Error Error in Indoor Unit Receiving Signal from Remote Controller (central) Error in Indoor Unit Receiving Signal from the Outdoor unit Error in Indoor Unit Transmitting Signal to the Outdoor Unit Error in the Outdoor Unit Receiving Signal from the Indoor Unit...
  • Page 94 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 4. Mini VRF System Alarm Codes 3. Mini VRF System Alarm Codes Checks Prior to Auto Address Setting If an outdoor unit displays an alarm, conduct this process after diagnosing the problem. 1 Auto Address Is the power of the indoor unit(s) and outdoor unit(s) on?
  • Page 95 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 4. Mini VRF System Alarm Codes 3. Mini VRF System Alarm Codes E01 Remote Controller Reception Error (When indoor unit(s) are connected) Error Detection Method It is judged an error if no self-addressed communication is sent to the remote controller in a 3-minute period. When a remote controller is set to sub remote controller.
  • Page 96 Mini VRF SYSTEM Trouble Diagnosis 3. Mini VRF System Alarm Codes Mini VRF SYSTEM Trouble Diagnosis 4. Mini VRF System Alarm Codes NOTE Regarding the PCB photos for individual indoor units, refer to the Section “PCB AND FUNCTIONS” in the TECHNICAL DATA.
  • Page 97 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 4. Mini VRF System Alarm Codes 3. Mini VRF System Alarm Codes E02 Remote Controller Transmission Error Error Detection Method When the remote controller itself cannot transmit. Or when it cannot receive the signal it transmitted itself, or when they are different and judged an error.
  • Page 98 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 4. Mini VRF System Alarm Codes 3. Mini VRF System Alarm Codes E03 Error in Indoor Unit Receiving Signal from Remote Controller (central) (When indoor unit(s) are connected) Error Detection Method It is judged an error when there is no communication from any remote controller (collectively) in a 3-minute period or if there is no communication from the central device in a 15-minute period.
  • Page 99 Mini VRF SYSTEM Trouble Diagnosis Mini VRF SYSTEM 3. Mini VRF System Alarm Codes Trouble Diagnosis 4. Mini VRF System Alarm Codes NOTE Regarding the PCB photos for individual indoor units, refer to the Section “PCB AND FUNCTIONS” in the TECHNICAL DATA.
  • Page 100 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 4. Mini VRF System Alarm Codes 3. Mini VRF System Alarm Codes E04 Error in Indoor Unit Receiving Signal from the Outdoor unit Error Detection Method When there is no communication within a 3-minute period from the outdoor unit. Or, judged an error when no reply comes from the outdoor unit.
  • Page 101 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 3. Mini VRF System Alarm Codes 4. Mini VRF System Alarm Codes • The ‘/’ in the table indicates the DC motor’s indoor unit board/AC motor’s indoor unit board. • There is no TEST pin on the AC motor’s indoor unit board.
  • Page 102 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 3. Mini VRF System Alarm Codes 4. Mini VRF System Alarm Codes E05 Error in Indoor Unit Transmitting Signal to the Outdoor Unit Error Detection Method It is judged an error when a unit itself cannot receive a signal that it has sent. Indoor unit control PC board error •...
  • Page 103 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 4. Mini VRF System Alarm Codes 3. Mini VRF System Alarm Codes E06 Error in the Outdoor Unit Receiving Signal from the Indoor Unit (When indoor unit(s) are connected) Error Detection Method It is judged an error when there is no transmission (reply) from the indoor unit to the outdoor unit for a period of three minutes.
  • Page 104 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 3. Mini VRF System Alarm Codes 4. Mini VRF System Alarm Codes E07 Error in Outdoor Unit Transmitting Signal to the Indoor Unit Error Detection Method It is judged an error when a unit itself cannot receive (discrepancy) a signal within a 3-minute period that it had sent. Outdoor main PC board error •...
  • Page 105 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 4. Mini VRF System Alarm Codes 3. Mini VRF System Alarm Codes E08 Duplicate Indoor Unit Address Settings Error Error Detection Method It is judged an error if the addresses of indoor units are duplicated. The indoor unit address settings are duplicated in the remote control detailed settings mode.
  • Page 106 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 4. Mini VRF System Alarm Codes 3. Mini VRF System Alarm Codes E09 More Than One Remote Controller Set to Main Error Error Detection Method It is judged an error when more than one remote controller in a remote control group is set as the main remote controller. Forgot to set one remote controller to sub in a 2-remote control group.
  • Page 107 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 4. Mini VRF System Alarm Codes 3. Mini VRF System Alarm Codes E12 Start of Auto Address Setting Prohibited Due to Auto Address Setting Being in Progress Error Detection Method It is judged an error if a command to start auto address setting comes from another controller during auto address setting.
  • Page 108 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 4. Mini VRF System Alarm Codes 3. Mini VRF System Alarm Codes E15 Auto-Address Alarm (not enough units) (When indoor unit(s) are connected) Error Detection Method It is judged an error not enough indoor units reply to communications and this is determined from the number of indoor units specified with the outdoor unit.
  • Page 109 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 4. Mini VRF System Alarm Codes 3. Mini VRF System Alarm Codes E16 Auto-Address Alarm (too many units) Error Detection Method It is judged an error when there are too many indoor units that reply to communications and this is determined from the number of indoor units specified with the outdoor unit.
  • Page 110 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 4. Mini VRF System Alarm Codes 3. Mini VRF System Alarm Codes E18 Faulty Communication in Group Control Wiring Error Detection Method When the main remote controller cannot communicate with a sub remote controller in the remote control group. It is judged an error if a sub remote controller in a remote control group fails to communicate with the main remote controller for a period of three minutes.
  • Page 111 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 4. Mini VRF System Alarm Codes 3. Mini VRF System Alarm Codes E20 No Indoor Units Error Error Detection Method It is judged an error if an indoor unit cannot be recognized at the start of auto address setting or when the outdoor unit is turned The address(es) of indoor unit(s) are not assigned correctly.
  • Page 112 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 4. Mini VRF System Alarm Codes 3. Mini VRF System Alarm Codes E30 Outdoor Unit Serial Transmission Error (Transmission from an outdoor unit faulty.) Error Detection Method Outdoor unit unable to read and confirm its own transmission data with the board of the outdoor unit. The power to the control PC board of the outdoor unit is not turned on.
  • Page 113 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 4. Mini VRF System Alarm Codes 3. Mini VRF System Alarm Codes F04 Compressor Discharge Temperature Sensor Error Error Detection Method It is judged an error based on the criteria listed below. Open circuit or Short circuit •...
  • Page 114 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 4. Mini VRF System Alarm Codes 3. Mini VRF System Alarm Codes F07 Heat Exchanger Inlet Temperature Sensor (C1) Error Error Detection Method It is judged an error when open circuit or short circuit. Error Diagnosis 1 Sensor Sensor connector is connected to PC board properly.
  • Page 115 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 4. Mini VRF System Alarm Codes 3. Mini VRF System Alarm Codes F08 Outdoor Air Temperature Sensor (TO) Error Error Detection Method It is judged an error when open circuit or short circuit. Error Diagnosis 1 Sensor Sensor connector is connected to PC board properly.
  • Page 116 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 4. Mini VRF System Alarm Codes 3. Mini VRF System Alarm Codes F12 Compressor Intake Temperature Sensor (TS) Error Error Detection Method It is judged an error when open circuit or short circuit. Error Diagnosis 1 Sensor Sensor connector is connected to PC board properly.
  • Page 117 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 4. Mini VRF System Alarm Codes 3. Mini VRF System Alarm Codes F16 High Pressure Sensor Error Error Detection Method It is judged an error based on the criteria listed below. Cooling: Status of lower 5°C saturated temperature under the detect pressure compared to the outdoor heat exchanger •...
  • Page 118 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 4. Mini VRF System Alarm Codes 3. Mini VRF System Alarm Codes F31 Outdoor Unit Nonvolatile Memory (EEPROM) Error Error Detection Method It is judged an error based on the criteria listed below. When power initially turned ON for the first time, nonvolatile memory (EEPROM) is not installed.
  • Page 119 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 3. Mini VRF System Alarm Codes 4. Mini VRF System Alarm Codes H01 Primary Current (Input) Detect of Overcurrent Error Detection Method • Primary current effective value detected overcurrent (trip current value). Trip current value hp = horsepower Trip current value...
  • Page 120 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 3. Mini VRF System Alarm Codes 4. Mini VRF System Alarm Codes H02 PAM Error Error Detection Method • Error is detected by over-voltage and overcurrent of DC side. Error Diagnosis Check power supply 1 Power Not satisfied with + 10% rated supply voltage...
  • Page 121 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 4. Mini VRF System Alarm Codes 3. Mini VRF System Alarm Codes H03 Compressor CT Sensor (Current Sensor) Unplugged Error Detection Method It is judged an error based on the criteria listed below. If 18A or greater is detected when the compressor is stopped (alarm triggered even if the connector is unplugged).
  • Page 122 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 4. Mini VRF System Alarm Codes 3. Mini VRF System Alarm Codes H31 HIC Error Error Detection Method It is judged an error if the computer detects an error signal from the HIC. An error signal is issued by the HIC if abnormal heat occurs inside the HIC or if there is an overcurrent.
  • Page 123 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 3. Mini VRF System Alarm Codes 4. Mini VRF System Alarm Codes NU W (for Single-phase outdoor unit HIC PC board) (for 3-phase outdoor unit HIC PC board) CN-PRY1 (for 3-phase outdoor unit CR PC board) 5 - 35 5 - 37...
  • Page 124 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 3. Mini VRF System Alarm Codes 4. Mini VRF System Alarm Codes L04 Duplicated Setting of Outdoor System Address Error Error Detection Method It is judged an error when the identical self-address communication on the indoor and outdoor wirings is received over 5 times within 3 minutes.
  • Page 125 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 4. Mini VRF System Alarm Codes 3. Mini VRF System Alarm Codes L10 Outdoor Unit Capacity Not Yet Setup Error Error Detection Method It is judged an error when outdoor unit capacity not yet setup or systematically unauthorized setting. Error Diagnosis 1 Check the Was EEPROM replaced when PC board was replaced?
  • Page 126 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 4. Mini VRF System Alarm Codes 3. Mini VRF System Alarm Codes L18 4-way valve operation failure Error Detection Method It is judged an error when during heating operation (Comp. ON), the highest detected temperature at an outdoor unit heat exchanger (C1) was 20°C or more above the outdoor air temperature (TO) continuously for 5 minutes or longer, or the detected suction temperature (SCT) was 20°C or more above the outdoor air temperature continuously for 5 minutes or longer.
  • Page 127 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 4. Mini VRF System Alarm Codes 3. Mini VRF System Alarm Codes P03 Compressor Discharge Temperature Error Error Detection Method • When the discharge temperature is over 106°C. Error Diagnosis Additional 1 Adjustment refrigerant charge...
  • Page 128 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 4. Mini VRF System Alarm Codes 3. Mini VRF System Alarm Codes P04 Actuation of High Pressure Switch Error Detection Method It is judged an error if the internal circuit of the high pressure switch is dead. The electronic circuitry of the high pressure switch is cut off if the pressure at the pressure sensor port of the high pressure switch reaches 3.80 MPa.
  • Page 129 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 4. Mini VRF System Alarm Codes 3. Mini VRF System Alarm Codes 3 Problem Prevent air short The intake temperature (ambient temperature) of the indoor unit is around the circuit above 36°C.
  • Page 130 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 4. Mini VRF System Alarm Codes 3. Mini VRF System Alarm Codes P05 Power Supply Error Error Detection Method • Instantaneous blackout Zero-cross (waveform input of power supply) error • DC voltage charge failure •...
  • Page 131 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 4. Mini VRF System Alarm Codes 3. Mini VRF System Alarm Codes P13 Forgot-to-open Valve Alarm Error Detection Method Detection is performed only in the test run. When once detected or the test run finished without any error, the second detection will not be done.
  • Page 132 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 4. Mini VRF System Alarm Codes 3. Mini VRF System Alarm Codes P14 O Sensor Error Detection Method It is judged an error whenever the outdoor unit receives the signal “O Alarm Occurred”...
  • Page 133 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 3. Mini VRF System Alarm Codes 4. Mini VRF System Alarm Codes P16 Overcurrent of Inverter Compressor Meaning of Alarm • Secondary current effective value detected the overcurrent (trip current value). Single-phase model : Trip current = 24.0 A 3-phase model : Trip current = 18.0 A Secondary current instantly detected over xx A.
  • Page 134 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 3. Mini VRF System Alarm Codes 4. Mini VRF System Alarm Codes 4 Check the Take measures Outdoor air intake temperature is high. situation Correct May be caused by poor outdoor unit air flow (dirty or clogged heat exchanger, blocked discharge port, etc.) Prevent air short Air short circuit has occurred.
  • Page 135 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 3. Mini VRF System Alarm Codes 4. Mini VRF System Alarm Codes 9 Check the See what happens. Replace the HIC PC board and operate the unit. (Apply putty and HIC PC screws must not be loose) Does it operate normally? 10-1...
  • Page 136 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 3. Mini VRF System Alarm Codes 4. Mini VRF System Alarm Codes P22 Outdoor Fan Motor Error Error Detection Method • It is judged an error when the outdoor fan motor's rotating signal cannot be detected normally. Error Diagnosis 1 Wiring Are the connectors “CN-FMA”, “CN-FMB”, “CN-FM1”, and...
  • Page 137 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 4. Mini VRF System Alarm Codes 3. Mini VRF System Alarm Codes P29 INV Compressor Start-up Failed (including lock) Due to INV Compressor Wiring Open Phase, Faulty DCCT, etc. Error Detection Method •...
  • Page 138 Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 4. Mini VRF System Alarm Codes 3. Mini VRF System Alarm Codes Single-phase outdoor unit HIC board 4-way Valve (CN-20S) Crankcase heater (CN-CH) CN-VDC- CN-VDC+ 3-phase outdoor unit HIC board 4-way Valve (CN-20S) Crankcase...

  • Page 139: Inspection Of Parts (Outdoor Unit)

    Mini VRF SYSTEM Mini VRF SYSTEM Trouble Diagnosis Trouble Diagnosis 4. Inspection of Parts (Outdoor Unit) 5. Inspection of Parts (Outdoor Unit) Electronic control valve (MOV1) MOV1: Measure the voltage between plug pin 5 and pins 1 through 4 at the CN-MOV1 connector (5P, white) on the outdoor unit control PCB.

  • Page 140: Symptom: Thermostat In Off Continues Or Cycles Off & On Too Frequently

    Mini VRF SYSTEM Mini VRF SYSTEM 6. Symptom: Thermostat in OFF continues or 5. Symptom: Thermostat in OFF continues or Trouble Diagnosis Trouble Diagnosis cycles OFF & ON too frequently cycles OFF & ON too frequently How to detect abnormality •...
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