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Elektronika SCM60ZD-S Manual

Inverter multi-split system room air conditioner
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INVERTER MULTI-SPLIT SYSTEM
ROOM AIR-CONDITIONER[3room]
(Air to air heat pump type)
(OUTDOOR UNIT)
SCM60ZD-S
(INDOOR UNIT)
SKM22ZD-S
SKM25ZD-S
SKM28ZD-S
SKM35ZD-S
SKM50ZD-S
STM25ZE-S
STM35ZE-S
STM50ZE-S
STM60ZE-S
SCM-ZD (3room)
SRRM25ZE-S
SRRM35ZE-S
SRRM50ZE-S
SRRM60ZE-S
1

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  • Page 1 SCM-ZD (3room) INVERTER MULTI-SPLIT SYSTEM ROOM AIR-CONDITIONER[3room] (Air to air heat pump type) (OUTDOOR UNIT) SCM60ZD-S (INDOOR UNIT) SKM22ZD-S STM25ZE-S SRRM25ZE-S SKM25ZD-S STM35ZE-S SRRM35ZE-S SKM28ZD-S STM50ZE-S SRRM50ZE-S SKM35ZD-S STM60ZE-S SRRM60ZE-S SKM50ZD-S...

  • Page 2: Table Of Contents

    CONTENTS 5.1 GENERAL INFORMATION ................ 377 5.1.1 Specific features ................. 377 5.1.2 How to read the model name ............. 377 5.2 SELECTION DATA ..................378 5.2.1 Specifications ..................378 5.2.2 Range of usage & limitations ............. 386 5.2.3 Exterior dimensions................387 5.2.4 Piping system ..................

  • Page 3: General Information

    GENERAL INFORMATION 5.1.1 Specific features (1) The long piping makes the location of the inside and units flexible. ¡ No need for additional charge of refrigerant : 30m ¡ Maximum piping length : 40m (2) Connectable indoor capacity Number of connectable units : 3 units Total of indoor units (class kW) : 11.0kW (3) Indoor units are available with 5 capacities.

  • Page 4: Selection Data

    Mounting kit, Clean filter (Natural enzyme filter × 1, Photocatalytic washable deodorizing filter × 1) Accessories (including) Optional parts — Outdoor unit to be combined SCM60ZD-S Notes (1) The data are measured at the following conditions. Item Indoor air temperature Outdoor air temperature...
  • Page 5 Mounting kit, Clean filter (Natural enzyme filter × 1, Photocatalytic washable deodorizing filter × 1) Accessories (including) Optional parts — Outdoor unit to be combined SCM60ZD-S Notes (1) The data are measured at the following conditions. Item Indoor air temperature Outdoor air temperature...
  • Page 6 Necessary (Both Liquid & Gas lines) Drain hose Connectable Accessories (including) Mounting kit Optional parts Wired remote control Outdoor unit to be combined SCM60ZD-S Notes (1) The data are measured at the following conditions. Item Indoor air temperature Outdoor air temperature Standards Operation Cooling 27ºC...
  • Page 7 Necessary (Both Liquid & Gas lines) Drain hose Connectable Accessories (including) Mounting kit Optional parts Wired remote control Outdoor unit to be combined SCM60ZD-S Notes (1) The data are measured at the following conditions. Item Indoor air temperature Outdoor air temperature Standards Operation Cooling 27ºC...
  • Page 8 (2) Outdoor unit Model SCM60ZD-S Model SCM60ZD-S Item Cooling capacity 6000 (1400~6900) Heating capacity 7000 (750~7200) Power source 1 Phase 220/230/240V 50Hz Cooling 1860 (400~3000) Power consumption Heating 1740 (320~2700) Cooling 8.5/8.2/7.8 Running current Heating 8.0/7.6/7.3 Sound level Cooling : 48/48/50...
  • Page 9 ¡ The capacity of the indoor units is shown by rooms. If this exceeds the maximum capacity of the outdoor unit, the demand capacity will be proportionally distributed. ¡ If units are to be combined, use the table below to make the proper selection. Model SCM60ZD-S (a) Heating Cooling capacity (kW)
  • Page 10 Cooling capacity (kW) Power cosumption (W) Standard current (kW) Indoor unit Roomcooling capacity (kW) Total capacity (kW) combinaton Min. Standard Max. 220V 230V 240V A room B room C room Min. Standard Max. 25+25+35 2.06 2.06 2.88 2000 2700 25+25+50 1.78 1.78 3.55...
  • Page 11 Cooling capacity(kW) Power cosumption (W) Standard current (kW) Indoor unit Roomcooling capacity (kW) Total capacity (kW) combinaton Min. Standard Max. 220V 230V 240V A room B room C room Min. Standard Max. 22+22+22 1.70 1.70 1.70 1470 2950 22+22+25 1.66 1.66 1.88 1500...
  • Page 12 5.2.2 Range of usage & limitations Model SCM60ZD-S Item Indoor intake air temperature (Upper, lower limits) Refer to the selection chart. Outdoor air temperature (Upper, lower limits) Indoor units Number of connected units 2 to 3 units that can be...

  • Page 13: Exterior Dimensions

    5.2.3 Exterior dimensions (1) Indoor unit Models SKM22ZD-S, 25ZD-S, 28ZD-S, 35ZD-S, 50ZD-S Unit : mm Piping hole right(left) 117.5 117.5 Terminal block 216.5 216.5 148.5 148.5 216.5 216.5 Remote controller 14.5 67.5 53.5 Piping for Gas 22,25,28,35: ø9.52 ø12.7 397.1 Piping for Liquid 465.1 (ø6.35) Drain hose 540...
  • Page 14 B Liquid pipe connecting port ø6.35(Flare) Terminal block ø 4 × 8(Holes for tapping screws) Air outlet Air inlet Drain hose (Connection opening diameter ø16) (2) Outdoor unit Model SCM60ZD-S Unit : mm Drain holes 286.4 203.1 136.9 Elogated hole (2-12X16) Terminal block Gas line service 34.6...

  • Page 15: Piping System

    5.2.4 Piping system Model SCM60ZD-S...

  • Page 16: Selection Chart

    5.2.5 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. (1) Coefficient of cooling and heating capacity in relation to temperatures Cooling Heating...

  • Page 17: Electrical Data

    ELECTRICAL DATA Meaning of marks • Outdoor Unit Symbol Parts name Symbol Parts name Compressor motor EEVA ~ D Electronic expansion valve Fan motor 4 way valve (coil) Capacitor (for FM Tho-A Sensor (outdoor air temp.) Reactor Tho-R Sensor (outdoor H.X temp.) Diode stack Tho-D Sensor (discharge pipe temp.)
  • Page 18 Model SKM50ZD-S Y/GN Power line (Outdoor unit) HEAT EXCHANGER Color symbol Black Blue Brown White Yellow Y/GN Yellow/Green (250V 3.15A) Printed circuit board Back up switch Display Wireless R-Amp...
  • Page 19 Models STM25ZE-S, 35ZE-S, 50ZE-S, 60ZE-S Control Printed circuit board (250V 3.15A) Z X Y Z Color symbol Black Power line Wired remote control Blue (Outdoor unit) (Optional parts) -A Th Yellow White Yellow/Green Models SRRM25ZE-S, 35ZE-S, 50ZE-S, 60ZE-S Control (Optional parts) (Optional parts) Printed circuit...
  • Page 20 (2) Outdoor unit Model SCM60ZD-S...

  • Page 21: Outline Of Operation Control By Microcomputer

    OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER (1) Operation control function by remote control switch 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 22 (b) Wired remote control (Optional parts)..STM, SRRM only The figure below shows the remote controller 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 23 (c) Unit indication section Models SKM22ZD-S, 25ZD-S, 28ZD-S, 35ZD-S, 50ZD-S RUN (HOT KEEP) light (green) • 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 HI POWER operation.
  • Page 24 (2) Unit ON/OFF button When the remote control batteries become weak, or if the remote control is lost or malfunctioning, this button may be used to turn the unit on and off. (a) Operation Push the button once to place the unit in the automatic mode. Push it once more to turn the unit off. (b) Details of operation The unit will go into the automatic mode in which it automatically determines, from room temperature (as detected by sensor), whether to go into the cooling, thermal dry or heating modes.
  • Page 25 (4) Power blackout auto restart function (a) Power blackout auto restart function is that records the operational status of the air-conditioner immediately prior to it being switched off by a power cut, and then automatically resumes operations at that point after the power has been restored. (b) The following settings will be cancelled: (i) Timer settings (ii) High-power operations...
  • Page 26 (b) Memory flap While the flap is operating if the AIRFLOW button is pushed once, it stops swinging at an angle. As this angle is memorized in the microcomputer, the flap will be automatically set to the angle when next operation is started.
  • Page 27 (7) Cooling operation (a) Summary (i) Capacity control Model SCM60ZD-S Capacity 1.4 ~ 6.9 kW Capacity control is within the range shown above. If demand capacity of the indoor units exceeds the maximum capacity of the outdoor unit, the demand capacity will be proportionally distributed.
  • Page 28 (8) Heating operation (a) Summary (i) Capacity control Model SCM60ZD-S Capacity 0.75 ~ 7.2 kW Capacity control is within the range shown above. If demand capacity of the indoor units exceeds the maximum capacity of the outdoor unit, the demand capacity will be proportionally distributed.
  • Page 29 (d) Hot keep operation N22, 25, 28, 35 models If the hot keep operation is selected during the heating operation, the indoor fan is controlled based on the temperature of the indoor unit heat exchanger (detected with Th ) to prevent blowing of cool wind. ¡...
  • Page 30 N50, 60 models ¡Normal mode (Normal heating operation, operation after HI POWER completion) 9th speed (10th speed) 8th speed 7th speed ¡ Values of A, B Indoor fan 6th speed 5th speed At 0 rps command 3rd speed Other than 0 rps 2nd speed command 1st speed...
  • Page 31 (e) Defrosting (i) When the following conditions are met, the defrosting operation will start. 1) During normal operation a) When 40 minutes has passed since the start of heating or 40 minutes after the last defrosting (based on cumulative operation time of compressor). b) When the outdoor heat exchanger sensor (Tho-R) temperature is –2 °C or less for 3 continuous minutes after 37 minutes have passed.
  • Page 32 NSCM60ZD-S Outdoor unit speed Outdoor unit fan R1 (rps) R2 (rps) 1-room 2-room 3-room 1-room 2-room 3-room X1 pluse X2 pluse 1-room 2-room 3-room 1-room 2-room 3-room Currently heating unit 4) Conditions for finishing defrosting When any of the following conditions is met, the defrosting finishing operation will start. 1 When the temperature of the outdoor heat exchanger sensor (Tho-R) is 20 °C or more.
  • Page 33 (10) Determining the operating mode The cooling and heating operating modes are the remote control switch mode that have been previously determined. If a mode differing from these is selected after this, the selected mode will appear in the display of the remote control, but only the fan will operate.
  • Page 34 (12) 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 on the indoor control board.
  • Page 35 (13) Control and protection functions (a) Frost prevention for indoor heat exchanger (During cooling or dehumidifying) (i) Operating conditions 1) Indoor heat exchanger temperature (detected with Th ) is lower than 5ºC. 2) 10 minutes elapsed after the start of operation. (ii) Detail of anti-frost operation •...
  • Page 36 (c) Freezing cycle system protective control (i) Operating conditions: When both of following conditions have continued for more than 5 minutes later than 5 minutes after the start of operation. 1) Indoor command speed is higher than 0 rps 2) During cooling, dehumidifying: Indoor heat exchanger temperature - Room temperature > –4ºC (ii) Detail of operation 1) Indoor unit The command speed is forced to operate at 16 rps.
  • Page 37 If the decision speed is below α1 rps, it runs at α1 rps for 5 minutes, then changes to the decision speed. • Value of α1 During heating overload protective control (Tho-A > = 14°C) Before heating overload protective control (Tho-A<14°C) SCM60ZD-S 23 rps 34 rps (h) Heating overload protection control...
  • Page 38 <III> (i) Operating conditions: When the outdoor unit is heating at a decision speed other than 0 rps and the temperature of the outdoor heat exchanger sensor is –12ºC or lower. (ii) Detail of condition: The decision speed is controlled as shown below. Decision speed 70 rps 40 rps...
  • Page 39 2 If 2 units stop while 3 units are operating. Functional components Operation of each functional components Remarks 0 rps 0 rps Command Command Command speed from indoor unit A room 2 min. 2 min. that has "heating 0 rps". Command rps Indoor 0 rps...
  • Page 40 3 Stop mode during high pressure cut control. Functional components Operation of each functional components Remarks 0 rps Command Command speed from indoor unit A room that has "heating 0 rps". Command rps Indoor 0 rps unit command 0 rps Command speed Within 2 min.
  • Page 41 Low rps continuous operation protection control The following controls are performed to return oil to the compressor when the decision speed other than 0 rps and 20 rps or less is continuously operated for 8 minutes. (i) The decision speed is forced to operate at 30 rps for 30 seconds. (ii) If there is a decision exceeding 30 rps during this forced 30 rps operation, this control ends and the operation follows that decision.
  • Page 42 (n) Current safe control (i) When converter in port current is detected at the current sensor (CT) and it exceeds the set amperage, the decision speed is reduced. This is rechecked after one second and if it still exceeds the set amperage, the decision speed is reduced 2 rps. (ii) If the decision speed operated at 20 rps or less, the compressor is stopped.
  • Page 43 Outdoor unit failure This is a function for determining when there is trouble with the outdoor unit during air conditioning. The compressor is stopped if any one of the following in item (i), (ii) is satisfied. Once the unit is stopped by this function, it is not restarted.
  • Page 44 (v) Dew condensation prevention control for the cooling and dehumidifying operation (STM, SRRM type only) <I> (i) Operation condition: During cooling or dehumidifying operation, 20 minutes elapsed after starting (with decision speed something other than 0 rps), under the following conditions. 1) When the fan speed is set to “AUTO”...

  • Page 45: Application Data

    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 46: Installation Of Indoor Unit

    5.5.1 Installation of indoor unit (1) Wall mounted type (SKM) (a) Caution for installation 1) The system should be applied to places as households, residences and the like. 2) The equipment shall be installed in accordance with national wiring regulations. 3) The connection to the fixed wiring of the mains supply must be made via a double pole isolating switch with a contact gap of at least 3mm in each pole.
  • Page 47 3) Mounting of interconnecting wires (Field wiring) a) Remove the lid. b) Remove the terminal block cover. c) Connect the connection wire securely to the terminal block. Use cables for interconnection wiring to avoid loosening of the wires. Terminal block CENELEC code for cables Required field cables.
  • Page 48 Drainage ¡ The drain hose must be fit with a downward slope. ¡ Do not set the drain hose like the following illustrations. under 5 cm Smell from sewerage drains. Too high The end of the It curves like a wave. The gap to the The end of the drain hose is...
  • Page 49 (b) Installation of indoor unit Installation dimensions Ceiling opening 660 (For conventional ceiling) Unit: mm Hanging bolt pitch 530 PANEL Control box Air intake Air outlet Drain hose(accessory) To be installed at site Inspection port (For conventional ceiling) Mark Description Model 25.35ZE-S 50.60ZE-S...
  • Page 50 1) Connect the connection wire securely to the terminal block. If the wire is not affixed completely, contact will be poor, and it is dangerous as the terminal block may heat up and catch fire. 2) Take care not to confuse the terminal numbers for indoor and outdoor connections. 3) Affix the connection wire using the wiring clamp.
  • Page 51 B. When embedded into ceiling 1. Determine the positions of hanging bolts (530 x 530). The pitch center of a hanging bolt must accord with the center of the unit. 2. Use four hanging bolts, each fastened in such a manner that it can withstand pull force of 50kgf. 3.
  • Page 52 C. Attaching the panel Hook 1 piece For fixing temporarily <Accessory items> Chain 2 pieces (It is attached to the panel.) Screw 4 pieces For hoisting the panel Screw 1 piece For attaching a hook Screw 2 pieces For attaching a chain a) Make sure that the unit main body is positioned at the correct height and the opening on the ceiling is made to the correct dimensions with the level gauge supplied with the main body.
  • Page 53 Attach two chains to the intake grille with two screws. [ Figure 7] Replace the corner panels. Please also close a chain with a screw together then. Close the intake grille. Chain Chain [Figure 7] (3) Ducted type (SRRM) (a) Caution for installation Install the unit with the customer's consent at location that meets the following conditions.
  • Page 54 3) Preparations for the Main Frame Mounting of interconnecting wires (Field wiring) a) Remove the control lid. b) Connect the connection wire securely to the terminal block. Control lid Use cables for interconnection wiring to avoid loosening of the wires. CENELEC code for cables Required field cables.

  • Page 55: Installation Of Remote Control

    6) Installing the Main Unit 7) Securing the Wireless Receiver • Attach the washers and nuts to the ceiling hanging bolts. • Attach the hanging tool to the above nuts, and tighten the nuts. Flat head machine screw M8 hanging bolt M8 nut Wireless receiver Installation frame...

  • Page 56: Installation Of Outdoor Unit

    5.5.3 Installation of outdoor unit (1) Selection of installation location (Please install with the customer’s consent in a location that follows the conditions listed below.) Where the following installation space is available, and where air does not gather. Where rain and sunlight do not directly hit the unit, and where there is enough air circulation. Also, where the unit cannot be buried by snow.

  • Page 57: Electrical Wiring

    5.5.4 Electrical wiring unit A unit B unit C Outdoor unit Circuit Earth breaker leakage breaker Indoor unit unit A unit B unit C (1) Connection of the power lines This multi-type room air conditioner receives its power from outside. It is necessary to use a single phase 220/230/240 V 50 Hz for the power supply.

  • Page 58: Refrigerant Piping

    (1) Limit The maximum permissible length of the refrigerant pipes for the outdoor units, and the maximum permissible height difference for the outdoor units are as shown below. SCM60ZD-S Length for one indoor unit under 25m Total length for all rooms...
  • Page 59 On site additional charge (Amount of uncharged refrigerant) *1 (Maximum amount of refrigerant) 30m (2200g) SCM60ZD-S 20g/m 40m (2400g) *1: Charge amount at the time of shipment. Ensure that there are no gas leaks from the pipe joints by using a leak detector or soap water.

  • Page 60: Test Run And Handling Instruction

    (5) Heat insulation for joint Heat insulation for joints SKM, SRRM models STM model Cover the joint with After checking each flare joint of the Band(accessory) Pipe cover (accessory) insulation material Position so Vinyl tape indoor unit for gas leaks, cover it with the for the indoor unit the slit attached insulating material and firmly...
  • Page 61 Beware of wrong connections in refrigerant piping and wiring ● Make sure to match the piping and wiring from each unit to the outdoor unit. ● Be careful because if connections are wrong, normal operation cannot be achieved and may damage the compressor. [Correct connections] [Example of wrong connections] Piping...
  • Page 62 Installation of wired remote control (Optional Recessed fitting parts) a) The Electrical box and remote control (shield wire Selection of installation location must be use in case of extension) are first Avoid the following locations embedded. 1) Direct sunlight. 2) Close to heating device. 3) Highly humid or water splashing area.
  • Page 63 (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 64 (ii) Function setting method 1) Stop the air conditioner Operating guide message 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 65 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 66 (iv) Changing the remote control’s temperature setting range 1) The temperature setting range of the remote control can be changed. Through remote control button operations, the upper limit and lower limit set temperature values can be changed individu- ally. 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 67 (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 68: Installation Of Optional Parts (Ducted Type)

    5.5.8 Installation of optional parts (Ducted type) Table of optional parts Bottom air inlet grille set Rear inlet filter set Duct joint for air outlet plate Drain up kit RTS12 RBF12 RFJ22 RDU12E (1) Bottom air inlet grille set (a) Part No.: RTS12 (b) Parts list Name Qty.
  • Page 69 (2) Rear inlet filter set Pan-head screw (a) Part No.: RBF12 Indoor unit Filter set Bracket for filter fixing (b) Installation Hanger metal Do not use this filter set alone. There are two inlet ports: lower inlet port (normal) and rear inlet port. Tappping screw 1) Detach the rear panel and the hanger metal screwad onto the rear panel from an indoor unit.
  • Page 70 Air flow and external static pressure characteristics (Heating: Hi) SRRM25ZE-S, 35ZE-S, 50ZE-S, 60ZE-S 60(6) 50(5) 40(4) 30(3) 20(2) Air flow (m /min) Air inlet grille air flow and friction loss characteristics (Part No.: RTS12) 30(3) 20(2) 10(1) Air flow (m /min)
  • Page 71 (4) Drain up kit (a) Part No. : RDU12E (b) Accessories Name Qty. Drain pump Drain hose Hose clamp Tapping screw (c) Installation of drain up kit Unit: mm Indoor unit Control VIEW A Fitting for drain hose Vinyl chloride pipe VP-25 (d) Installation of drain up kit 4 Tapping screw Fix the drain up kit on the right side of the...
  • Page 72 Use hard PVC general purpose pipes VP-25 sold on the market 3 Hose clamp for drain pipes after draining up. Tighten the PVC pipe securely with the attached clamp after inserting it in the drain socket. Drain hose The drain pipe must have downward inclination gradient of 1/ 100 or more, and take care not to make a trap or uphill pass.

  • Page 73: Maintenance Data

    MAINTENANCE DATA 5.6.1 Trouble shooting (1) Trouble shooting to be performed prior to exchanging PCB, (Printed circuit board) [Common to all models] All the models described in this chapter are controlled by a microcomputer. When providing maintenance service to customers it is necessary to understand the function controlled by a micro computer thoroughly, so as not to mistakenly identify correct opera- tions as mis-operations.
  • Page 74 (2) Indication of self diagnosis Indoor unit Outdoor unit Wired remote indicator Description of indicator control display Cause Conditions of flashing trouble TIMER (LED 5) (optional parts) light light • Broken heat exchanger sensor (1) When heat exchanger sensor (1) temperature of –20 °C or under continued for more than 15 Indoor heat exchanger 1 time...

  • Page 75: Current Cut

    (3) Inspection procedures corresponding to detail of trouble [Broken sensor wire, Sensor error connector poor connection] Correct connection. Is connector connection good? Is sensor resistance value good? Replace sensor. Replace PCB. N Discharge pipe sensor temperature characteristics N Sensor temperature characteristics (Room temp., indoor and outdoor unit heat Temperature (˚C) Resistance (kΩ)
  • Page 76 [Broken power transistor, Outdoor unit e rror broken compressor wire] Is output voltage applied to all 3 Defective inverter phases of power transistor? Is compressor wiring connected Connect securely. securely? Inspect compressor. (Broken coil wire) [Overload operation, compressor Current safe stop lock, overcharge] Discharge refrigerant.

  • Page 77: Compressor Lock

    [Indoor/outdoor printed circuit board defect Serial signal transmission abnormality Outdoor power source abnormality] Possible causes include interference This is due to a tem- from the lighting, spontaneous load in- Is this a recurring error when reset- porary cause (interfer- terference, power supply interference ting power supply? ence, etc.) and is not a and radial interference.
  • Page 78 (4) Phenomenon observed after shortcircuit, wire breakage on sensor. (a) Indoor unit Phenomenon Operation Sensor mode Shortcircuit Broken wire Cooling Release of continuous compressor operation command Continuous compressor operation command is not released. Room temperature sensor Release of continuous compressor operation command Heating Continuous compressor operation command is not released.
  • Page 79 (6) Indoor electrical components inspection flowchart Is there voltage between terminal Inspect power source blocks 1 and 2 ? (AC 220/230/240 for outdoor unit. Is the fuse burnt out? (3.15 A) Replace fuse. Is there voltage between CNC (1) Replace the transformer. and (2) on the secondary side of the transformer? (Approx.
  • Page 80 (7) Inverter failure diagnosis If the results of the diagnosis in Item (3) indicate that the inverter is defective, perform the following inspection on the inverter. (a) Diagnosis procedure Fuse is defective Is the fuse good? e Replace Varistor is defective Is the varistor good? e Replace Noise filter is defective...

  • Page 82: Servicing

    5.6.2 Servicing (1) 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.

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