CONTENTS 1.2.1 GENERAL INFORMATION ....................................................................... 71 (1) Specific features .................................................................................... 71 (2) How to read the model name ............................................................... 71 1.2.2 SELECTION DATA .................................................................................... 72 (1) Specifications ..................................................................
1.2.1 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.
1.2.
Model SRK71ZE-S1 (Indoor unit) SRC71ZE-S1 (Outdoor unit) (220/230/240V) Model SRK71ZE-S1 Item Refrigerant piping Operation data(1)(2) Cooling capacity(1) Heating capacity(1) Power source Cooling input Running current (Cooling) Heating input Running current (Heating) Inrush current COP Sound level Cooling Power level Noise level Sound level Heating Power level Exterior dimensions Height × Width × Depth Color Net weight Refrigerant equipment Compressor type & Q’ty Motor Starting method Heat exchanger R
(2) Range of usage & limitations Models SRK63ZE-S1, 71ZE-S1 Item Indoor return air temperature (Upper, lower limits) Cooling operation: Approximately 18 to 32°C Heating operation: Approximately 15 to 30°C Outdoor air temperature (Upper, lower limits) Cooling operation: Approximately -15 to 46°C Heating operation: Approximately -15 to 21°C Refrigerant line (one way) length Max. 30m Vertical height difference between outdoor unit and indoor unit Max. 20m (Outdoor unit is higher) Max.
(b) Outdoor unit Models SRC63ZE-S1, 71ZE-S1 532 223 60 Drain holes 380 418 Unit: mm 61 25.8 29.8 2-ø15 150 580 880 150 19 61 340 47.5 19 15 87.9 Terminal block 750 165.5 25.1 Service valve (Liquid) Flare fitting ø6.35 (1/4") 103.3 24.1 30˚ 48.5 30˚ Service valve (Gas) Flare fitting ø15.88 (5/8") (4) Piping system Models SRK63ZE-S1, 71ZE-S1 Indoor unit Outdoor unit Cooling cycle Heating cycle Flare connecting Piping (Gas) ø15.88 Humidity sensor Room temp.
(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 Coefficient of cooling & Heating capacity in relation to temperature 1.3 1.2 Cooling 1.1 1.0 Heating 0.9 0.8 0.7 0.6 Cooling operation Outdoor air D.B. temperature ˚CD.
LM1 CNX CNM - CNY CNG CNF CNB RD WH BK 77 - CNE XYZ Color symbol Black BK Blue BL Orange OR Red RD Y Yellow WH White Y/G Yellow/Green GR Green XYZ Display SM Wireless R-AMP Th1 Th2 Th3 To wired remote control (option) CM F FMI FMo SM LM1,2 Th1 Th2 Parts name Compressor motor Fuse Fan motor(Indoor) Fan motor(Outdoor) Flap motor Louver motor Room temp.sensor Heat exch.sensor(Indoor unit) Symbol Th3 Th4 Th5 Th6 Th7 ZNR 20S EEV Parts name Humidity sensor Heat exch.
1.2.4 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 Each time the button is pushed, the cator is switched over in turn. OPERATION MODE select button indi- Each time the button is pushed, the cator is switched over in turn. indi- ON/OFF (luminous) button HI POWER/ECONO button Press for starting operation, press again for stopping.
(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. Note (1) The SRK models don't support the switches and functions displayed in [ ]. Pull the cover downward to open it.
(c) Unit indication section RUN (HOT KEEP) light (green) Models All models • Illuminates during operation. • 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. ECONO light (orange) Illuminates during ECONOMY operation.
(4) Custom cord switching procedure If two wireless remote controls are installed in one room, in order to prevent wrong EXTERNAL INPUT operation due to mixed signals, please modify the printed circuit board in the indoor OPE PERMISSION CUSTOM unit’s control box and the remote control using the following procedure. Be sure to AUTO RESTART WIRED REMOCON Jumper wire (J4) LO TEMP modify both boards. If only one board is modified, receiving (and operation) cannot DIRT PREVENT COOL ONLY be done.
(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. (Max.
(8) Outline of heating operation (a) Operation of major functional components in heating mode Item When the inverter speed is 0rps Functional components When the inverter speed is other than 0rps When the inverter speed is 0rps due to an anomalous stop Indoor fan motor ON ON OFF Flap and louver ON or OFF ON or OFF Stop position control Display Lights up Lights up Lights up or flashes Outdoor fan motor 4-way valve ON Depending on the stop mode ON Electronic expansion valve Depending on t
(iii) Hot keep operation If the hot keep operation is selected during the heating operation, the indoor blower is controlled based on the temperature of the indoor unit heat exchanger (detected with Th2, indoor unit heat exchanger sensor) to prevent blowing of cool wind. ¡ Hot keep N mode (Air flow: HI, MED, LO, ULO) 0 ¡ Values of A, B 9 Indoor fan speed 8 7 At 0 rps command Other than 0 rps command 6 5 A B 22 25 10 15 4 3 2 1 OFF A B 26 27 28 29.5 31.5 33 34.5 36 37.5 39 40.
(ii) Operation of functional components during defrosting operation indoor unit Indoor fan motor RUN light Hot keep OFF ON Flashing (Hot keep) outdoor unit Inverter command Outdoor fan motor Hot keep Corresponding to speed 70rps Fuzzy calculated value 0 (1) Corresponding to speed OFF 40sec. 40sec. ON OFF 4-way valve Defrost operation preparation Defrost operation 120sec. 120sec. Final defrost operation Normal heating operation restored Defrost end (Th4 15°C ,10 min.
(9) Outline of cooling operation (a) Operation of major functional components in Cooling mode Item When the inverter speed is 0rps Functional components When the inverter speed is other than 0rps When the inverter speed is 0rps due to an anomalous stop Indoor fan ON ON OFF Flap and louver ON or OFF ON or OFF Stop position control Display Lights up Lights up Lights up or flashes Outdoor fan motor ON 4-way valve Depending on the stop mode OFF Electronic expansion valve Depending on the
(10) Outline of dehumidifying operation (a) After operating the indoor blower for 20 seconds from immediately after the start of operation, the indoor temperature is checked and, based on the result of check, the cooling oriented dehumidifying or heating oriented dehumidifying is selected.
(ii) Heating oriented dehumidifying After interrupting the compressor operation for 3 minutes (by the 3-minute timer) following the determination of heating oriented dehumidifying, the unit begins in the heating operation. If the room temperature exceeds the setting temperature by 2ºC or more, the unit checks the room temperature at 5-minute intervals and, depending on the result, determines the range of heating oriented dehumidifying operation within the (M) range.
(12) Outline of fan operation (a) Operation of major functional components Fan speed switching Functional components Inverter command speed Indoor fan motor AUTO HI MED LO ULO ECONO 4th speed 2nd speed 2nd speed 0rps 2nd speed 6th speed 8th speed Outdoor fan motor OFF Flap and louver Depend on the flap and louver control (13) Outline of clean operation COOL, DRY, AUTO (COOL, DRY); after operation has stopped, the moisture inside the dryer air conditioner, controls the production of fungus e
(i) Fan operation1 1) (ii) Operation content Inverter command speed 0 rps Indoor fan motor 1st speed Outdoor fan motor OFF Flap and louver Fully closed/ Center Cooling operation 1) Operation content Note (1) Inverter command speed 20 rps Indoor fan motor 2nd speed Outdor fan motor 3rd speed Flap and louver Horizoc/Center 4-way valve OFF During cooling operation safety control,frost prevention control, and cooling overload protective control are generally not applicable (iii) Heating
(iv) Fan operation2 1) (v) Standby operation Operation content 1) Operation content Inverter command speed 0 rps Inverter command speed Indoor fan motor OFF Indoor fan motor OFF Outdoor fan motor 2nd speed Outdoor fan motor Determined by stop mode Flap and louver Fully closed/ Center Flap and louver Fully closed/ Center 0 rps (15) ECONOMY operation (ECONO button on remote control: ON) (a) The set temperature is raised by 1.5ºC (0.
(17) 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.
(18) Protective control function (a) Indoor fan motor protection When the air conditioner is operating and the indoor fan motor is turned ON, if the indoor fan motor has operated at 300 rpm or under for more than 30 seconds, the unit enters first in the stop mode and then stops the entire system. TIMER light illuminates simultaneously and the RUN light flashing 6 times at each 8-second.
◆ < II > (i) Operating conditions: When all of the following conditions are met. 1 After the inverter command speed is at a value other than 0 rps for 8 minutes, when the indoor heat exchanger temperature is less than 5°C. 2 When the inverter command speed is more than 20 rps. (ii) Detail of operation: 1 Indoor heat exchanger temperature < = 5ºC The inverter command speed is reduced 4rps at each 20 seconds. Lower limit speed is 20 rps.
◆ < II > (i) Operating conditions: When the outdoor air temperature sensor (Th5) is 22ºC or lower continues for 30 seconds while outdoor speed is other than 0rps. (ii) Detail of operation: 1 The lower limit of inverter command speed is set to 20(30)rps and even if the speed becomes lower than 20(30)rps, the speed is kept to 20(30)rps. However, when the thermo becomes OFF, the speed is reduced to 0rps.
(h) Heating low outdoor temperature protective control ◆ (i) Operating conditions: When the outdoor air temperature sensor (Th5) is 4°C or lower continues for 30 seconds while outdoor speed is other than 0rps. (ii) Detail of operation: When the inverter command speed is less than 20rps, the speed is forcibly set at 20rps. However, when the thermo becomes OFF, the speed is reduced to 0rps. (iii) Reset conditions: When the outdoor air temperature sensor (Th5) becomes 6°C or higher.
(l) 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.
(q) Power transistor overheat protection (i) Purpose: In order to prevent the power transistor overheating during operation, faulty controller operations, deterioration, (ii) Detail of operation: damage and so on occurs. 1 Power transistor sensor temperature => 110ºC The compressor is stopped immediately. When the power transistor sensor temperature is less than 80°C, restart. 2 90ºC < = Power transistor sensor temperature < 110ºC The outdoor unit speed drops to 4 rps.
(t) Compressor lock If the motor for the compressor does not turn 1/12 revolution 0.044 seconds after it has been started, it is determined that a compressor lock has occurred and the compressor is stopped. (u) Outdoor fan motor protection If the outdoor fan motor has operated at 75rpm or under for more than 30 seconds, the inverter and fan motor are stopped.
1.2.5 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.
(1) Selection of location for installation (a) Indoor unit (i) (ii) (iii) (iv) (v) (vi) (vii) Where there is no obstructions to the air flow and where the cooled air can be evenly distributed. A solid place where the unit or the wall will not vibrate. A place where there will be enough space for servicing. (Where space mentioned right can be secured) Where wiring and the piping work will be easy to conduct.
(2) Installation of indoor unit (a) Installation of installation board (i) Fixing of installation board Look for the inside wall structures (Intersediate support or pillar and firaly install the unit after level surface has been checked.) 610 450 INSTALLATION SPACE (INDOOR UNIT) (FRONT VIEW) Mating mark for level surface Adjustment of the installation board in the horizontal direction is to be conducted with four screws in a temporary tightened state.
(c) Preparation of indoor unit (i) 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. CENELEC code for cables. Required field cables. H05RNR4G1.
[Drain hose changing procedures] 1. Remove the drain hose. 2. Remove the drain cap. ¡Remove the drain hose, ¡Remove it with hand or making it rotate. pliers. 3. Insert the drain cap. 4. Connect the drain hose. ¡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 proce-dure “2” securely using a hexagonal securely, makingit rotate. wrench, etc.
(3) Installation of outdoor unit (a) Installation of outdoor unit (i) 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. (iii) Perform wiring, making wire terminal numbers conform to terminal numbers of indoor nuit terminal block. (iv) Connect using ground screw located near mark.
(c) Air purge (i) 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 – 0.1 MPa (– 76 cmHg).
(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. (f) Standard operation data (220/230/240V) Model SRK63ZE-S1 SRK71ZE-S1 Cooling – – Heating 2.5~2.7 2.6~2.8 Cooling 0.8~1.0 0.7~0.9 Item High pressure (MPa) Low pressure (MPa) Temp. difference between return air and supply air (°C) Running current (A) Heating – – Cooling 12~14 12~14 Heating 16~18 17~19 Cooling 8.4/8.1/7.7 10.1/9.7/9.
(6) Precautions for wireless remote control installation and operation (a) Wireless remote control covers the following distances: (i) When operating facing the air conditioner: 5 m or le ss Wireless remote control 5 m or less or les s or le ss or less Notes (1) The remote control is correctly facing the sensing element of the air conditioner when being manipulated. (2) The typical coverage is indicated (in the left illustration). It may be more or less depending on the installation.
(7) Installation of wired remote control and super link adapter (SC-ADE) (Optional parts) (iv) Cut the jumper attached on the board. • Remove the upper box. Remove the screw, the latch and the band. (a) Modifying the indoor unit’s printed circuit board (i) Remove the air inlet panel (Refer to the installa tion directions). (ii) Remove the front panel (Refer to the installation directions). (iii) Remove the control box • Remove the screw and the latch, and open the control lid.
(b) Installation of wired remote control (Optional parts) (i) Selection of installation location Avoid the following locations 1) Direct sunlight. 2) Close to heating device. 3) Highly humid or water splashing area. 4) Uneven surface. (ii) Installation procedure 1) Exposed fiting a) Open the remote control case. 2) Recessed fitting a) The Electrical box and remote control (shield wire must be use in case of extension) are first embedded.
(c) Setting functions using the wired remote control (i) 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.
(ii) Function setting method 1) Stop the air conditioner 2) Press the SET and MODE buttons simultaneously for 3 seconds or longer. The screen display will be switched as follows: “ SELECT ITEM” “ AUTO RUN SET SET" “FUNCTION SET ” FUNCTION SET 3) Press the SET button. The unit will enter the function setting mode.
When “I/U FUNCTION ” is selected. 1 The screen display will be switched as follows: “ SET” I/U SELECT” “ “I/U No.00” (blinking) I/U No.00 or button. 2 Press either 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. If “ALL I/U ” is selected while indoor group control is in effect, you can set all units to the same settings. 3 Press the SET button.
(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.
(d) SUPER LINK ADAPTER (SC-AD-E) (i) Functions 1) 2) 3) 4) 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).
1.2.6 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.
(d) Troubleshooting procedure (If the air conditioner runs) Confirm the contents of the customer complaint. NO The cause of the trouble can be specifically identified. Eliminate the cause of the trouble and perform an operation check. Check the self-diagnosis display. See pages 118. Is an error code displayed by the self-diagnosis function? YES NO Using the Service Mode, access the self-diagnosis displays generated in the past. See pages 119~122.
(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.
(f) Service mode (Trouble mode access function) This air conditioner is capable of recording error displays and protective stops (service data) which have occurred in the past. If self-diagnosis displays cannot be confirmed, it is possible to get a grasp of the conditions at the time trouble occurred by checking these service data.
*3: To count the number of flashes in the service mode, count the number of flashes after the light lights up for 1.5 second initially (start signal). (The time that the light lights up for 1.5 second (start signal) is not counted in the number of flashes.) • In the case of current safe (heating CT1) (example: stop code “32”) The RUN light (10’s digit) flashes 3 times and the TIMER light (1’s digit) flashes 2 times.
2 Stop data Remote control setting Operation switching Displayed data Fan speed Temperature switching setting Cooling LO 21°C Displays the reason for the stop (stop code) the previous time when the air conditioner was stopped by protective stop control. 22°C Displays the reason for the stop (stop code) 2 times previous when the air conditioner was stopped by protective stop control.
Number of flashes when in service mode Stop code Error content or RUN TIMER light Error code light Minor category Major category (10’s digit) (1’s digit) 4 time flash 5 time flash 6 time flash 7 time flash Occurrence conditions Error Auto display recovery Cooling overload 1 (outdoor temperature: 36~40ºC) Overcharge Compressor lock Overload operation When there is a current safe stop in overload 1 mode during cooling operation.
Notes (1) The number of flashes when in the Service Mode do not include the 1.5 second period when the lights light up at first (starting signal). (See the example shown below.) • In the case of current safe (heating CT1) (example: stop code “32”) The RUN light (10’s digit) flashes 3 times and the TIMER light (1’s digit) flashes 2 times. 3 × 10 + 2 × 1 = 32 → From the table, read the instructions for error code 32, “Current safe (heating CT1). 1.5 sec. RUN light (10’s digit) ON OFF 0.5 sec. 0.5 sec.
(v) Room temperature sensor temperature, indoor heat exchanger sensor temperature, outdoor air temperature sensor temperature, outdoor heat exchanger sensor temperature table Units: °C TIMER light (1’s digit) RUN light (10’s digit) 0 1 2 3 4 5 6 7 8 9 6 -60 -61 -62 -63 -64 5 -50 -51 -52 -53 -54 -55 -56 -57 -58 -59 4 -40 -41 -42 3 -30 -31 -32 -43 -44 -45 -46 -47 -48 -49 -33 -34 -35 -36 -37 -38 -39 2 -20 -21 1 -10 -11 -22 -23 -24 -25 -26 -27 -28 -
(vi) Discharge pipe temperature table Units: °C TIMER light (1’s digit) RUN light (10’s digit) 0 1 2 3 4 5 6 7 8 9 3 -60 -62 -64 2 -40 -42 -44 -46 -48 -50 -52 -54 -56 -58 1 -20 -22 -24 -26 -28 -30 -32 -34 -36 -38 -2 -4 -6 -8 -10 -12 -14 -16 -18 Buzzer sound (minus) Yes (sounds for 0.
Service data record form Model Customer Date of investigation Machine name Content of complaint Display results Remote control settings Temperature setting Operation switching Fan speed switching MED Cooling 21 Heating Cooling 22 Heating Cooling 23 Heating Cooling 24 Heating Cooling 25 Heating Content of displayed data Error code on previous occasion. HI Room temperature sensor temperature on previous occasion. AUTO Indoor heat exchanger sensor temperature on previous occasion.
(g) Inspection procedures corresponding to detail of trouble [Broken sensor wire, connector poor connection] Sensor error Is connector connection good? NO Correct connection. YES NO Is sensor resistance value good? Replace sensor. YES Replace PCB. ◆ Sensor temperature characteristics (Room temp., indoor unit heat exchanger temp., outdoor unit heat exchanger temp., outdoor air temp.
[Open phase on compressor output terminal, compressor lock] Current cut Does current cut operate when operating inverter with compressor wire disconnected? NO Defective inverter YES Is output voltage applied to all 3 phases of power transistor? NO Defective inverter YES NO Secure space for suction and blow out. Is there any shortcircuit? YES ¡ Check compressor wiring visually. Inspect compressor. If check results are normal, compressor is locked. ¡ Check insulation resistance.
[Gas shortage, defective discharge pipe sensor] Over heat of compressor Is discharge pipe sensor resistance value good? (page 127) NO Connector connection check, resistance value check, replacement of discharge pipe sensor YES NO Is sufficient quantity of refrigerant circulated? Does trouble persist after charging gas? NO Check if there are any places where gas is leaking. YES YES Clogged capillary tube or strainer, defective EEV, etc.
[Defective fan motor, connector poor connection, defective PCB] Outdoor fan motor error Is connector connection good? NO Correct connector connection YES * Disconnect the fan motor connector, then investigate the DC fan motor and outdoor unit circuit board separately.
(ii) Outdoor unit Phenomenon Sensor Operation mode Heat exchanger sensor Cooling System can be operated normally. System can be operated normally. Heating Defrosting is not performed. Defrosting is performed for 10 minutes at approx. 45 minutes. Outdoor air temperature sensor Cooling System can be operated normally. System can be operated normally. Heating Defrosting is not operated. Defrosting is performed for 10 minutes at approx. 45 minutes.
(j) Inverter failure diagnosis If the results of the diagnosis in Item (h) indicate that the inverter is defective, perform the following inspection on the inverter.
CAUTION – HIGH VOLTAGE 133 - N L Y/G Y/G Y/G WH F 250V 20A BK BK BK BL OR RD Y WH Y/G GR Black Blue Orange Red Yellow White Yellow/Green Green Color symbol G2 CNO G3 N-1 L-1 FMo BL GR AC.N AC.L PWB3 (CAPACITOR)P_1 CNG N_1 BL GR DC-N CND N_1 CNG CNG CNH CNH } CNI RD U WH V BK W AF_L2 OR OR AF_L1 RD WH BK OR OR ● Inspect power transistor. Remove the fasten terminal and test output voltage.
◆ Power transistor inspection procedure [Use a tester with a needle indicator for the inspection. (Do not use a digital tester. Check in the AC 300 volt range.)] 1) If there is a self-diagnosis display, inspect the compressor system (burns, wiring mistakes, etc.). If no problems are found, check the output of the power transistor. 2) Output inspection procedure (Example) Self-diagnosis display : Flashes 2 times Disconnect the terminals for the compressor.
(2) Servicing (a) Evacuation The evacuation is an procedure to purge impurities......noncondensable gas, air, moisture from the refrigerant equipment by ngusi 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. ¡ Evacuation procedure (i) Check to ensure that there is no internal pressure in the unit.
MEMO - 136 -
