Mitsubishi Heavy Industries SRK50HE-S1 Technical Manual
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Mitsubishi Heavy Industries SRK50HE-S1 Technical Manual

Mitsubishi Heavy Industries SRK50HE-S1 Technical Manual

Wall mounted type room air conditioner
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WALL MOUNTED TYPE ROOM AIR-CONDITIONER
( Split system, air to air heat pump type )
SRK50HE-S1, SRK56HE-S1
SRK63HE-S1, SRK71HE-S1
Manual No. '06 . SRK-T . 050
updated September 29, 2009
3
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Summary of Contents for Mitsubishi Heavy Industries SRK50HE-S1

  • Page 1 Manual No. ’06 . SRK-T . 050 updated September 29, 2009 WALL MOUNTED TYPE ROOM AIR-CONDITIONER ( Split system, air to air heat pump type ) SRK50HE-S1, SRK56HE-S1 SRK63HE-S1, SRK71HE-S1...

  • Page 2: Wall Mounted Type Room Air-Conditioner

    2. WALL MOUNTED TYPE ROOM AIR-CONDITIONER Split system, air to air heat pump type 2.2 SRK50HE-S1 SRK56HE-S1 ............176 2.3 SRK63HE-S1 SRK71HE-S1 ............211...
  • Page 3 CONTENTS 2.2.1 GENERAL INFORMATION ..............177 Specific features ................... 177 How to read the model name .............. 177 2.2.2 SELECTION DATA ................... 178 Specifications ..................178 Range of usage & limitations .............. 180 Exterior dimensions ................180 Piping system ..................181 Selection chart ..................

  • Page 4: General Information

    (1) Specific features The “MITSUBISHI HEAVY INDUSTRIES, LTD.” room air-conditioner: SRK series are of split and wall mounted type and the unit consists of indoor unit and outdoor unit with refrigerant precharged in factory. The indoor unit is composed of room air cooling or heating equipment with operation control switch and the outdoor unit is composed of condensing unit with compressor.

  • Page 5: Selection Data

    2.2.2 SELECTION DATA (1) Specifications Model SRK50HE-S1 (Indoor unit) SRC50HE-S1 (Outdoor unit) (220/230/240V) Model SRK50HE-S1 SRC50HE-S1 Item Cooling capacity 4700 Heating capacity 5300 Power source 1 Phase, 220-240V, 50Hz Cooling input 1.41 Running current (Cooling) 6.5/6.3/6.0 Heating input 1.40 Running current (Heating) 6.5/6.2/6.0...
  • Page 6 Model SRK56HE-S1 (Indoor unit) SRC56HE-S1 (Outdoor unit) (220/230/240V) Model SRK56HE-S1 SRC56HE-S1 Item Cooling capacity 5100 Heating capacity 5800 Power source 1 Phase, 220-240V, 50Hz Cooling input 1.59 Running current (Cooling) 7.3/7.1/6.8 Heating input 1.58 Running current (Heating) 7.4/7.1/6.8 Inrush current 45.2 Cooling: 3.21 Heating: 3.67 Sound level...

  • Page 7: Range Of Usage & Limitations

    (2) Range of usage & limitations Models All models Item Indoor return air temperature Cooling operation : Approximately 21 to 32˚C (Upper, lower limits) Heating operation : Approximately 15 to 30˚C Outdoor air temperature Cooling operation : Approximately 21 to 43˚C (Upper, lower limits) Heating operation : Approximately -5 to 21˚C Refrigerant line (one way) length...

  • Page 8: Piping System

    (2-12 x16) Terminal block 34.6 Ground terminal Service valve (Liquid) ø6.35 (1/4'') Service valve (Gas) ø12.7 (1/2'') (4) Piping system Models SRK50HE-S1, 56HE-S1 Indoor unit Outdoor unit Cooling cycle Heating cycle Outdoor air Flare connection Service valve temp. sensor (Gas)

  • Page 9: Selection Chart

    0.87 0.92 1.00 How to obtain the cooling and heating capacity Example : The net cooling capacity of the model SRK50HE-S1 with the piping length of 15m, indoor wet-bulb temperature at 19.0˚C ✕ ✕ 1.0 = 4583 W and outdoor dry-bulb temperature 35˚C is Net cooling capacity = 4700 0.975...

  • Page 10: Electrical Data

    2.2.3 ELECTRICAL DATA (1) Electrical wiring Models SRK50HE-S1, 56HE-S1...

  • Page 11: Outline Of Operation Control By Microcomputer

    2.2.4 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER (1) Operation control function by remote control switch Remote controller Models All models S Operation section FAN SPEED button OPERATION MODE select button Each time the button is pushed, the indi- Each time the button is pushed, the indi- cator is switched over in turn.

  • Page 12: Unit On/Off Button

    Unit indication section RUN (HOT KEEP) light (green) • Illuminates during operation. Models All models • Brinks at air flow stop due to the ‘HOT KEEP’. TIMER light (yellow) Illuminates during TIMER operation. HI POWER light (green) Illuminates during HIGH POWER operation. ECONOMY light (orange) Illuminates during ECONOMY operation.

  • Page 13: Custom Cord Switching Procedure

    (4) Custom cord switching procedure Jumper wire (J6) If two wireless remote controllers are installed in one room, in order to prevent wrong operation due to mixed signals, please modify the printed circuit board in the indoor unit’s control box and the remote controller using the following procedure.

  • Page 14: Comfortable Timer Setting

    (6) Comfortable timer setting If the timer is set at ON when the operation select switch is set at the cooling or heating, or the cooling or heating in auto mode operation is selected, the comfortable timer starts and determines the starting time of next operation based on the initial value of 15 minutes and the relationship between the room temperature at the setting time (temperature of room temperature sensor) and the setting temperature.
  • Page 15 (c) Thermostat operation The compressor and outdoor fan and turned on and off as shown below according to the temperature setting. Compressor Outdoor fan Room temp. Set temp. (d) Hot keep This function controls the indoor unit fan speed as shown below in accordance with the temperature sensed by the indoor heat exchanger sensor.
  • Page 16 (iii) Operation of functional components during defrosting operation Compressor command Hot keep Controlled by the indoor heat Hot keep exchanger temperature Indoor unit fan The chart at left is for reference. Hot keep control governs operation Run light during heating. Flashes Outdoor unit fan 4-way valve...

  • Page 17: Outline Of Cooling Operation

    (8) Outline of cooling operation (a) Operation of major functional components Item When the compressor When the compressor When the compressor goes Functional command is OFF command is ON OFF due to an anomalous stop. components Indoor fan motor Flaps ON or OFF ON or OFF Stop position control...

  • Page 18: Outline Of Dehumidifying Operation

    (9) Outline of dehumidifying operation (a) Choose the appropriate operation block area by the difference between room temperature and thermostat setting temperature as shown below. ¡ Operation block area D Block C Block B Block A Block –2 Room temp. – Setting temp.(deg) (b) Start up operation C.D Block A.B Block...

  • Page 19: Outline Of Automatic Operation

    (10) Outline of automatic operation (a) Determination of operation mode The unit checks the room temperature and the outdoor air temperature after operating the indoor and outdoor blowers for 20 seconds, determines the operation mode and the room temperature setting correction value, and then begins in the automatic operation.

  • Page 20: Protective Control Function

    (12) Protective control function (a) Frost prevention for indoor heat exchanger (During cooling or dehumidifying) Operating conditions Indoor heat exchanger temperature sensor (detected with Th2) is lower than 2.5ºC. (ii) 10 minutes elapsed after the start of operation. (ii) Detail of frost prevention operation Compressor Indoor fan Protects the fan tap just before frost prevention control.
  • Page 21 (g) Compressor overheat protection If the discharge pipe temperature (sensed by Th6) exceeds the set temperature value, the compressor stops. If the temperature is 95ºC or lower after a 3-minute delay, it starts again, but if this function is reactivated again within 60 minutes, it results in an abnormal stop. (Run light : ON, Timer light : 5 time flash, outdoor unit LED : 5 time flash) Operation possible Abnormal stop...
  • Page 22 2.2.5 APPLICATION DATA SAFETY PRECAUTIONS ¡ Please read these “Safety Precautions” first then accurately execute the installation work. ¡ Though the precautionary points indicated herein are divided under two headings, WARNING and CAUTION , those points which are related to the strong possibility of an installation done in error resulting in death or serious injury are listed in the WARNING section.

  • Page 23: Selection Of Location For Installation

    (1) Selection of location for installation (a) Indoor unit Where there is no obstructions to the air flow and where the cooled air can be evenly distributed. 4 cm Right (ii) A solid place where the unit or the wall will not vibrate. side 10 cm Left...

  • Page 24: Installation Of Indoor Unit

    (2) Installation of indoor unit (a) Installation of installation board Fixing of installation board Look for the inside wall structures (Intersediate support or INSTALLATION SPACE (INDOOR UNIT) (FRONT VIEW) pillar and firaly install the unit after level surface has been Indoor unit Unit : mm checked.)
  • Page 25 (c) Preparation of indoor unit Mounting of connecting wires 1) Remove the lid. 2) Remove the wiring clamp. 3) Connect the connecting wire securely to the terminal block. Use cables for interconnection wiring to avoid loosening of the wires. Terminal block CENELEC code for cables.
  • Page 26 [Drain hose changing procedures] 1. Remove the drain hose. 2. Remove the drain cap. 3. Insert the drain cap. 4. Connect the drain hose. ¡Remove the drain hose, ¡Remove it with hand or ¡Insert the drain cap which was removed at ¡I n s e r t t h e d r a i n h o s e making it rotate.

  • Page 27: Installation Of Outdoor Unit

    (3) Installation of outdoor unit (a) Installation of outdoor unit Make sure that sufficient space for installation and service is secured. (ii) Fix the leg sections of the unit on a firm base which will not play. Attach cushion pads, etc. between the unit and the mounting fixtures not to transmit vibration to the building. (iii) Attach a drain elbow, etc.
  • Page 28 (c) Air purge Tighten all flare nuts in the pipings both indoor and outside will so as not to cause leak. (ii) Connect service valve, charge hose, manifold valve and vacuum pump as is illustrated below. (iii) Open manifold valve handle Lo to its full width, and perform vacuum or evacuation. Continue the vacuum or evacuation operation for 15 minutes or more and check to see that the vacuum gauge reads –...
  • Page 29 (d) Explain to the customer on the correct usage of the air conditioner in simple layman’s terms. (e) Make sure that drain flows properly. Standard operation data (220/230/240V) Model SRK50HE-S1 SRK56HE-S1 Item – – Cooling High pressure (MPa) Heating 2.6~2.8 2.8~3.0...

  • Page 30: Maintenance Data

    2.2.6 MAINTENANCE DATA (1) Troubleshooting procedures for electrical equipment (a) Cautions 1 If you are disassembling and checking an air conditioner, be sure to turn off the power before beginning. When working on indoor units, let the unit sit for about 1 minute after turning off the power before you begin work. When working on an outdoor unit, there may be an electrical charge applied to the main circuit (electrolytic condenser), so begin work only after discharging this electrical charge (to DC 10 V or lower).
  • Page 31 (d) Troubleshooting procedure (If the air conditioner runs) Confirm the contents of the customer complaint. The cause of the trouble can be specifically identified. Eliminate the cause of the trouble and perform an Check the self-diagnosis display. operation check. See page 205. Identify the faulty component by using the check procedure corresponding to the content of the trouble.
  • Page 32 (e) Self-diagnosis table When this air conditioner performs an emergency stop, the reason why the emergency stop occurred is displayed by the flashing of display lights. If the air conditioner is operated using the remote controller 3 minutes or more after the emergency stop, the trouble display stops and the air conditioner resumes operation.

  • Page 33: Sensor Error

    Inspection procedures corresponding to detail of trouble [Broken sensor wire, Sensor error connector poor connection] Is connector connection good? Correct connection. Is sensor resistance value good? Replace sensor. Replace PCB. ◆ Sensor temperature characteristics ◆ Discharge pipe sensor temperature characteristics (Room temp., indoor unit heat exchanger Temperature (˚C) Resistance (kΩ)
  • Page 34 [Gas shortage, defective discharge Over heat of compressor pipe sensor] Connector connection check, resistance Is discharge pipe sensor resistance value good? value check, replacement of discharge pipe sensor (page 206) Check if there are any Does trouble persist after Is sufficient quantity of refrigerant places where gas is leaking.
  • Page 35 [Compressor malfunction of Abnormality of outdoor unit insufficient gas (refrigerant)] Replace capacitor for compressor. Does compressor operation? Is capacitor for compressor normal? Is connector for compressor connection Correct connection good? Replace compressor. Is heat exchanger sensor volume for Replace heat exchanger sensor inside unit good? Check if there are any places where Is refrigerant amount normal?
  • Page 36 (ii) Indoor unit fan motor check procedure This is a diagnostic procedure for determining if the indoor unit’s fan motor or the circuit board is broken down. 1) Indoor unit printed circuit board output check a) Turn off the power. b) Remove the front panel, then disconnect the fan motor lead wire connector.

  • Page 37: Refrigerant Piping Installation/Servicing Manual For Air Conditioners Using R410A

    (2) Servicing (a) Evacuation The evacuation is an procedure to purge impurities..noncondensable gas, air, moisture from the refrigerant equipment by using a vacuum pump. Since the refrigerant R410A is very insoluble in water, even a small amount of moisture left in the refrigerant equipment will freeze, causing what is called water clogging.
  • Page 38 CONTENTS 2.3.1 GENERAL INFORMATION ..............212 Specific features ................... 212 How to read the model name ............... 212 2.3.2 SELECTION DATA ................... 213 Specifications ..................213 Range of usage & limitations .............. 215 Exterior dimensions ................215 Piping system ..................217 Selection chart ..................
  • Page 39 (1) Specific features The “MITSUBISHI HEAVY INDUSTRIES, LTD.” room air-conditioner: SRK series are of split and wall mounted type and the unit consists of indoor unit and outdoor unit with refrigerant precharged in factory. The indoor unit is composed of room air cooling or heating equipment with operation control switch and the outdoor unit is composed of condensing unit with compressor.
  • Page 40 2.3.2 SELECTION DATA (1) Specifications Model SRK63HE-S1 (Indoor unit) SRC63HE-S1 (Outdoor unit) (220/230/240V) Model SRK63HE-S1 SRC63HE-S1 Item Cooling capacity 6300 Heating capacity 6700 Power source 1 Phase, 220-240V, 50Hz Cooling input 2.19 Running current (Cooling) 10.9/10.5/10.0 Heating input 1.85 Running current (Heating) 9.2/8.8/8.5 Inrush current Cooling: 2.88 Heating: 3.62...
  • Page 41 Model SRK71HE-S1 (Indoor unit) SRC71HE-S1 (Outdoor unit) (220/230/240V) Model SRK71HE-S1 SRC71HE-S1 Item Cooling capacity 7100 Heating capacity 7500 Power source 1 Phase, 220-240V, 50Hz Cooling input 2.21 Running current (Cooling) 11.0/10.6/10.1 Heating input 2.07 Running current (Heating) 10.3/9.9/9.5 Inrush current Cooling: 3.21 Heating: 3.62 Sound level...
  • Page 42 (2) Range of usage & limitations Models All models Item Indoor return air temperature Cooling operation : Approximately 21 to 32˚C (Upper, lower limits) Heating operation : Approximately 15 to 30˚C Outdoor air temperature Cooling operation : Approximately 21 to 43˚C (Upper, lower limits) Heating operation : Approximately -5 to 21˚C Refrigerant line (one way) length...
  • Page 43 (b) Outdoor unit Model SRC63HE-S1 286.4 Drain holes Unit: mm 203.1 136.9 Elogated hole (2-12 x16) Terminal block 34.6 Ground terminal Service valve (Liquid) ø6.35 (1/4'') Service valve (Gas) ø12.7 (1/2'') Model SRC71HE-S1 Unit: mm Drain holes 2-ø15 25.8 29.8 87.9 Terminal block Service valve (Liquid)
  • Page 44 (4) Piping system Model SRK63HE-S1 Indoor unit Outdoor unit Cooling cycle Heating cycle Outdoor air Flare connecting Service valve temp. sensor (Gas) Piping Check joint (Gas) ø 12.7 Humidity 4 way valve accumulator sensor uffler Room temp. Heat sensor Heat exchanger Discharge pipe exchanger...
  • Page 45 (5) Selection chart Correct the cooling and heating capacity in accordance with the conditions as follows. The net cooling and heating capacity can be obtained in the following way. Net capacity = Capacity shown on specification ✕ Correction factors as follows. (a) Coefficient of cooling and heating capacity in relation to temperatures Cooling Heating...
  • Page 46 2.3.3 ELECTRICAL DATA (1) Electrical wiring Model SRK63HE-S1...
  • Page 47 Model SRK71HE-S1...
  • Page 48 2.3.4 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER (1) Operation control function by remote control switch (a) Wireless remote control Models All models S Operation section FAN SPEED button OPERATION MODE select button Each time the button is pushed, the indi- Each time the button is pushed, the indi- cator is switched over in turn.
  • Page 49 (b) Wired remote control (Optional parts) The figure below shows the remote control with the cover opened. Note that all the items that may be displayed in the liquid crystal display area are shown in the figure for the sake of explanation. Characters displayed with dots in the liquid crystal display area are abbreviated.
  • Page 50 (c) Unit indication section RUN (HOT KEEP) light (green) Models All models • Illuminates during operation. • Blinks at air flow stop due to the ‘HOT KEEP’ TIMER light (yellow) Illuminates during TIMER operation. HI POWER light (green) Illuminates during HIGH POWER operation. ECONO light (orange) Illuminates during ECONOMY operation.

  • Page 51: Flap And Louver Control

    (4) Custom cord switching procedure If two wireless remote controls are installed in one room, in order to prevent wrong EXTERNAL INPUT WIRED REMOCON operation due to mixed signals, please modify the printed circuit board in the indoor OPE PERMISSION CUSTOM Jumper wire (J4) unit’s control box and the remote control using the following procedure.

  • Page 52: Sleep Timer Operation

    (6) Comfortable timer setting If the timer is set at ON when the operation select switch is set at the cooling or heating, or the cooling or heating in auto mode operation is selected, the comfortable timer starts and determines the starting time of next operation based on the initial value of 15 minutes and the relationship between the room temperature at the setting time (temperature of room temperature sensor) and the setting temperature.
  • Page 53 (8) Outline of heating operation (Heat pump type only) (a) Operation of major functional components Item When the compressor When the compressor When the compressor goes Functional command is OFF command is ON OFF due to an anomalous stop. components Indoor fan motor Flap and louver ON or OFF...
  • Page 54 (e) Hot spurt For 40 minutes after a heating operation begins, the system runs with set temperature raised by 2ºC. (ii) In the following cases, this function is canceled and does not activate afterwards. 1) When the compressor and outdoor unit fan have been turned OFF by the thermostat going off. 2) During high pressure control operation.
  • Page 55 (h) Forced defrost Forced defrost operation can be performed only once time within 20 second, after the power source is turned on, in accor- dance with the following operation. 2) Functional components operation 1) Remote control operation Operation Compressor Operation mode Heating 4-way valve Set temperature...
  • Page 56 (c) Thermostat operation The compressor and outdoor fan and turned on and off as shown below according to the temperature setting. Compressor Outdoor fan Room temp. Set temp. (d) HIGH POWER operation ( “HI POWER” button on the remote control : ON) The following operation is performed for 15 minutes without relation to the set temperature or fan speed setting.
  • Page 57 (c) DRY operation After finishing start up operation described in (b) previous page, thermal dry operation is performed at 8 minutes intervals, according to the difference between room temperature and thermostat setting temperature as shown below. Beside, 1 cycle of this operating time consists of 8 minutes, 7 cycle operation is performed then. D Block C Block Compressor...

  • Page 58: Regulation Of Outdoor Air Flow

    (b) Within 30 minutes after either auto or manual operation stops, if auto operation is started, or if you switch to auto operation during manual operation, the system runs in the previous operation mode. (c) The temperature is checked 1 time in 30 minutes after the start of operation, and if the judgment differs from the previous operation mode, the operation mode changes.

  • Page 59: Stop Mode

    (14) Stop mode When the complete stop command given, when When stoppage occurs due to thermostat operation, there is and abnormal stoppage command switching operations and protective function operations Functional Operation Cooling,cooling Heating,heating Cooling,cooling Heating,heating components oriented dehumidifying oriented dehumidifying oriented dehumidifying oriented dehumidifying 3 min.

  • Page 60: External Control (Remote Display)/Control Of Input Signal

    (15) External control (remote display)/control of input signal Make sure to connect the wired remote control unit. Control of input signal is not available without the wired remote control unit. (a) External control (remote display) output Following output connectors (CNT) are provided on the printed circuit board of indoor unit. Operation output: Power to engage DC 12V relay (provided by the customer) is outputted during operation.

  • Page 61: Operation Permission/Prohibition Control

    (16) Operation permission/prohibition control The air conditioner operation is controlled by releasing the jumper wire (J3) on the indoor control board and inputting the external signal into the CnT. (a) The operation mode is switched over between Permission and Prohibition by releasing the jumper wire (J3) on the indoor control board.
  • Page 62 (b) Dew condensation prevention control [Cooling (including automatic), cooling oriented dehumidifying operation] Operating condition: When the following conditions are met after 5 minutes or more of continuous operation after operation starts. Prevention control • The humidity sensor value is 68% or higher (ii) Operation contents Reset 1) Command of the electronic expansion valve.
  • Page 63 (g) Compressor overheat protection If the discharge pipe temperature (sensed by Th6) exceeds the set temperature value, the compressor stops. If the temperature is 95ºC or lower after a 3-minute delay, it starts again, but if this function is reactivated again within 60 minutes, it results in an abnormal stop. (Run light : ON, Timer light : 5 time flash) Operation possible Abnormal stop...
  • Page 64 2.3.5 APPLICATION DATA SAFETY PRECAUTIONS ¡ Please read these “Safety Precautions” first then accurately execute the installation work. ¡ Though the precautionary points indicated herein are divided under two headings, WARNING and CAUTION , those points which are related to the strong possibility of an installation done in error resulting in death or serious injury are listed in the WARNING section.
  • Page 65 (1) Selection of location for installation (a) Indoor unit Where there is no obstructions to the air flow and where the cooled air can be evenly distributed. (ii) A solid place where the unit or the wall will not vibrate. 6.5 cm Right (iii) A place where there will be enough space for servicing.
  • Page 66 (2) Installation of indoor unit (a) Installation of installation board Fixing of installation board Look for the inside wall structures (Intersediate support or INSTALLATION SPACE (INDOOR UNIT) (FRONT VIEW) pillar and firaly install the unit after level surface has been checked.) Unit: mm Mating mark for level surface...
  • Page 67 (c) Preparation of indoor unit Mounting of connecting wires 1) Open the air inlet panel. 2) Remove the lid. 3) Remove the wiring clamp. 4) Connect the connecting wire securely to the terminal block. Use cables for interconnection wiring to avoid loosening of the wires.
  • Page 68 [Drain hose changing procedures] 1. Remove the drain hose. 2. Remove the drain cap. 3. Insert the drain cap. 4. Connect the drain hose. ¡Remove the drain hose, ¡Remove it with hand or ¡Insert the drain cap which was removed at ¡I n s e r t t h e d r a i n h o s e making it rotate.
  • Page 69 (3) Installation of outdoor unit (a) Installation of outdoor unit Make sure that the unit is stable in installation. Fix the unit to stable base. (ii) When installing the unit at a higher place or where it could be toppled by strong winds, secure the unit firmly with foundation bolts, wire, etc.
  • Page 70 (c) Air purge Tighten all flare nuts in the pipings both indoor and outside will so as not to cause leak. (ii) Connect service valve, charge hose, manifold valve and vacuum pump as is illustrated below. (iii) Open manifold valve handle Lo to its full width, and perform vacuum or evacuation. Continue the vacuum or evacuation operation for 15 minutes or more and check to see that the vacuum gauge reads –...
  • Page 71 (d) Explain to the customer on the correct usage of the air conditioner in simple layman’s terms. (e) Make sure that drain flows properly. Standard operation data (220/230/240V) Model SRK63HE-S1 SRK71HE-S1 Item – – Cooling High pressure (MPa) High pressure (MPa) Heating 2.37 2.62...

  • Page 72: Installation Of Wired Remote Con- Trol And Super Link Adapter (Sc-Ad- E) (Optional Parts)

    (7) Installation of wired remote con- (iv) Cut the jumper attached on the board. trol and super link adapter (SC-AD- • Remove the upper box. Remove the screw, the latch and the band. E) (Optional parts) (a) Modifying the indoor unit’s printed circuit Screw Band board...
  • Page 73 (b) Installation of wired remote control (Optional 2) Recessed fitting parts) a) The Electrical box and remote control (shield (i) Selection of installation location wire must be use in case of extension) are Avoid the following locations first embedded. 1) Direct sunlight. 2) Close to heating device.
  • Page 74 (c) Setting functions using the wired remote control The default settings of this unit's functions are as follows: If you want to charge a setting, follow the procedure found in the installation manual and set to your desired setting. For the method of setting, please refer to the installation manual of a remote control unit. 1 Remote control unit functions ( 2 Indoor unit functions (I/U FUNCTION FUNCTION...
  • Page 75 (ii) Function setting method perating guide message 1) Stop the air conditioner Function description: B , Settting: C Function number: A 2) Press the SET and MODE buttons simultaneously for 3 seconds or longer. The screen display will be switched as follows: Confirm Button “...
  • Page 76 When “I/U FUNCTION ” is selected. 1 The screen display will be switched as follows: “ I/U SELECT” “ SET” “I/U No.00” (blinking) I/U No.00 2 Press either button. Select the indoor unit number that you want to change settings. If only one indoor unit is connected, the indoor unit number will not charge, so please proceed to Step 3.
  • Page 77 (iv) Changing the remote control’s temperature setting range 1) The temperature setting range of the remote controller can be changed. Through remote controller button operations, the upper limit and lower limit set temperature values can be changed individually. During heating operation, the changed upper limit value becomes valid and at times other than during heating operation, (during cooling, dehumidification, auto and fan operation), the changed lower limit value becomes valid.
  • Page 78 (d) SUPER LINK ADAPTER (SC-AD-E) (i) Functions Transmits the settings from the Super link option to the indoor units. Returns the priority indoor unit data in response to a data request from the Super link option. Inspects the error status of connected indoor units and transmits the inspection codes to the Super link option. A maximum of 16 units can be controlled (if in the same operation mode).
  • Page 79 2.3.6 MAINTENANCE DATA (1) Troubleshooting procedures for electrical equipment (a) Cautions 1 If you are disassembling and checking an air conditioner, be sure to turn off the power before beginning. When working on indoor units, let the unit sit for about 1 minute after turning off the power before you begin work. When working on an outdoor unit, there may be an electrical charge applied to the main circuit (electrolytic condenser), so begin work only after discharging this electrical charge (to DC 10 V or lower).
  • Page 80 (d) Troubleshooting procedure (If the air conditioner runs) Confirm the contents of the customer complaint. The cause of the trouble can be specifically identified. Eliminate the cause of the trouble and perform an Check the self-diagnosis display. operation check. See page 254. Identify the faulty component by using the check procedure corresponding to the content of the trouble.
  • Page 81 (e) Self-diagnosis table When this air conditioner performs an emergency stop, the reason why the emergency stop occurred is displayed by the flashing of display lights. If the air conditioner is operated using the remote control 3 minutes or more after the emergency stop, the trouble display stops and the air conditioner resumes operation.
  • Page 82 Inspection procedures corresponding to detail of trouble [Broken sensor wire, Sensor error connector poor connection] Is connector connection good? Correct connection. Is sensor resistance value good? Replace sensor. Replace PCB. ◆ Sensor temperature characteristics ◆ Discharge pipe sensor temperature characteristics (Room temp., indoor unit heat exchanger Temperature (˚C) Resistance (kΩ)
  • Page 83 [Gas shortage, defective discharge Over heat of compressor pipe sensor] Connector connection check, resistance Is discharge pipe sensor resistance value good? value check, replacement of discharge pipe sensor (page 255) Check if there are any Does trouble persist after Is sufficient quantity of refrigerant places where gas is leaking.
  • Page 84 [Compressor malfunction of Abnormality of outdoor unit insufficient gas (refrigerant)] Replace capacitor for compressor. Does compressor operation? Is capacitor for compressor normal? Is connector for compressor connection Correct connection good? Replace compressor. Is heat exchanger sensor resistance Replace heat exchanger sensor value good? Check if there are any places where Is refrigerant amount normal?
  • Page 85 (ii) Indoor unit fan motor check procedure This is a diagnostic procedure for determining if the indoor unit’s fan motor or the circuit board is broken down. 1) Indoor unit printed circuit board output check a) Turn off the power. b) Remove the front panel, then disconnect the fan motor lead wire connector.
  • Page 86 (2) Servicing (a) Evacuation The evacuation is an procedure to purge impurities..noncondensable gas, air, moisture from the refrigerant equipment by using a vacuum pump. Since the refrigerant R410A is very insoluble in water, even a small amount of moisture left in the refrigerant equipment will freeze, causing what is called water clogging.
  • Page 87 MEMO...
  • Page 88 INVERTER WALL MOUNTED TYPE ROOM AIR-CONDITIONER Air-Conditioning & Refrigeration Systems Headquarters 16-5, 2-chome, Kounan, Minato-ku, Tokyo, 108-8215, Japan Fax : (03) 6716-5926...

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