Mitsubishi Heavy Industries SRK20ZFX-S Technical Manual
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Mitsubishi Heavy Industries SRK20ZFX-S Technical Manual

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Manual No. '06 . SRK-T . 051
TECHNICAL MANUAL
Collection data
INVERTER WALL MOUNTED TYPE
ROOM AIR-CONDITIONER
( Split system, air to air heat pump type )
SRK20ZFX-S, 25ZFX-S, 35ZFX-S, 50ZFX-S
3
-
-

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Summary of Contents for Mitsubishi Heavy Industries SRK20ZFX-S

  • Page 1 Manual No. ’06 . SRK-T . 051 TECHNICAL MANUAL Collection data INVERTER WALL MOUNTED TYPE ROOM AIR-CONDITIONER ( Split system, air to air heat pump type ) SRK20ZFX-S, 25ZFX-S, 35ZFX-S, 50ZFX-S...

  • Page 2: Table Of Contents

    CONTENTS 1. GENERAL INFORMATION ................1 Specific features ..................1 How to read the model name ..............1 2. SELECTION DATA..................2 Specifications ..................2 Range of usage & limitations ............... 6 Exterior dimensions ................6 Piping system ..................8 Selection chart ..................

  • Page 3: General Information

    1.1 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 4: Selection Data

    SELECTION DATA 2.1 Specifications Model SRK20ZFX-S (Indoor unit) SRC20ZFX-S (Outdoor unit) (220/230/240V) Model SRK20ZFX-S SRC20ZFX-S Item Cooling capacity 2000 (500~2800) Heating capacity 2400 (500~4600) Power source 1 Phase, 220-240V, 50Hz Cooling input 0.37 (0.1~0.91) Running current (Cooling) 2.1/2.0/1.9 Heating input 0.44 (0.09~1.27)
  • Page 5 Model SRK25ZFX-S (Indoor unit) SRC25ZFX-S (Outdoor unit) (220/230/240V) Model SRK25ZFX-S SRC25ZFX-S Item Cooling capacity 2500 (500 ~ 3000) Heating capacity 3000 (500 ~ 5000) Power source 1 Phase, 220-240V, 50Hz Cooling input 0.50 (0.10 ~ 0.64) Running current (Cooling) 2.5/2.4/2.3 Heating input 0.59 (0.09 ~ 1.16) Running current (Heating)
  • Page 6 Model SRK35ZFX-S (Indoor unit) SRC35ZFX-S (Outdoor unit) (220/230/240V) Model SRK35ZFX-S SRC35ZFX-S Item Cooling capacity 3500 (500 ~ 3900) Heating capacity 4200 (500 ~ 5100) Power source 1 Phase, 220-240V, 50Hz Cooling input 0.87 (0.10 ~ 0.98) Running current (Cooling) 4.2/4.0/3.8 Heating input 1.00 (0.09 ~ 1.19) Running current (Heating)
  • Page 7 Model SRK50ZFX-S (Indoor unit) SRC50ZFX-S (Outdoor unit) (220/230/240V) Model SRK50ZFX-S SRC50FX-S Item Cooling capacity 5000 (600~5300) Heating capacity 6000 (600~7900) Power source 1 Phase, 220-240V, 50Hz Cooling input 1.56 (0.12~2.1) Running current (Cooling) 7.5/7.2/6.9 Heating input 1.66 (0.11~2.71) Running current (Heating) 7.9/7.6/7.3 Inrush current 7.9/7.6/7.3...

  • Page 8: Range Of Usage & Limitations

    2.2 Range of usage & limitations Models SRK20ZFX-S, 25ZFX-S, 35ZFX-S SRK50ZFX-S Item Cooling operation: Approximately 21 to 32°C Indoor return air temperature Heating operation: Approximately 15 to 30°C (Upper, lower limits) Outdoor air temperature Cooling operation: Approximately -15 to 43°C (Upper, lower limits) Heating operation: Approximately -5 to 21°C...
  • Page 9 (2) Outdoor unit Models SRC20ZFX-S, 25ZFX-S, 35ZFX-S Unit: mm Drain holes 264.5 404.5 17.8 2-16 x12 Terminal block 61.9 Service valve (Liquid) 139.3 33.3 Flare connection ø6.35 (1/4") Service valve (Gas) Flare connecting ø9.52 (3/8") Model SRC50ZFX-S 286.4 Drain holes 2-16 ×...

  • Page 10: Piping System

    2.4 Piping system Models SRK20ZFX-S, 25ZFX-S, 35ZFX-S Indoor unit Outdoor unit Cooling cycle Heating cycle Outdoor air Flare connection Service valve temp. sensor (Gas) Piping Check joint (Gas) ø9.52 4 way valve Accumulator Room temp. Discharge pipe Heat Heat temp. sensor...

  • Page 11: Selection Chart

    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 12: Electrical Data

    ELECTRICAL DATA 3.1 Electrical wiring Models SRK20ZFX-S, 25ZFX-S, 35ZFX-S...
  • Page 13 Model SRK50ZFX-S AF_L2 AF_L1 PWB3 (CAPACITOR)

  • Page 14: Outline Of Operation Control By Microcomputer

    OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER 4.1 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 15: Unit On/Off Button

    Unit indication section RUN (HOT KEEP) light (green) Models All models • Illuminates during operation. • Brinks at air flow stop due to the ‘HOT KEEP’ and ‘CLEAN’ operation. 1.5 sec. HOT KEEP 0.5 sec. 3 sec. CLEAN HI POWER light (green) operation Illuminates during HIGH POWER operation.

  • Page 16: Custom Cord Switching Procedure

    4.4 Custom cord switching procedure Jumper wire (J6) If two wireless remote controls 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 control using the following procedure.

  • Page 17: Comfortable Timer Setting

    4.6 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 18: Outline Of Heating Operation

    If the speed obtained with the fuzzy calculation drops below -24 rps during the heating fuzzy operation, the operation changes to the heating thermostat operation. ¡ Detail of operation Model SRK20ZFX-S, 25ZFX-S, 35ZFX-S SRK50ZFX-S Item 10 rps [10sec.] → 0rps [Comp. stopped] Inverter speed 0rps [Comp.
  • Page 19 ¡ Hot keep M mode [During HI POWER operation (for 15 min.)] (20, 25, 35 type only) 9th speed 8th speed 7th speed ¡ Values of A, B Indoor fan 6th speed 5th speed At 0 rps command 4th speed Other than 0 rps command 3rd speed...

  • Page 20: Outline Of Cooling Operation

    2 Continued operation time of defrosting → For more than 10 min. (e) Heating “HIGH POWER” operation (HI POWER button on remote control: ON) Operation is maintained for 15 minutes with a higher blow out air temperature. ¡ Detail of operation Model SRK20ZFX-S SRK25, 35ZFX-S SRK50ZFX-S Item Inverter speed...

  • Page 21: Outline Of Dehumidifying Operation

    (b) Cooling thermostat operation Operating conditions During the cooling fuzzy operation or when the speed obtained by the fuzzy calculation is less than -24 rps. (ii) Detail of operation Model SRK20ZFX-S, 25ZFX-S, 35ZFX-S SRK50ZFX-S Item 10rps [10sec.] → 0rps [Comp. stopped] Inverter speed 0 rps [Comp.
  • Page 22 (2) Outline of control (a) Cooling oriented dehumidifying Room temperature is checked at 5-minute intervals after selecting the cooling or heating oriented dehumidifying in order to determine the operation range. Note (1) Figures in the parentheses Operation range ( D ) ( C ) ( C ) ( B )

  • Page 23: Outline Of Automatic Operation

    (1) The set temperature is raised by 1.5ºC (0.5ºC every one hour) at cooling operation and lowered by 2.5ºC (Steps of 1ºC, 1ºC and 0.5ºC every one hour) at heating operation to continue the operation with the following contents. (2) Detail of operation ◆ Heating Model SRK20ZFX-S SRK25ZFX-S SRK35ZFX-S SRK50ZFX-S Item...

  • Page 24: Protective Control Function

    4.14 Protective control function (1) Frost prevention for indoor heat exchanger (During cooling or dehumidifying) (a) Operating conditions Indoor heat exchanger temperature (detected with Th2) is lower than 5ºC. (ii) 10 minutes after reaching the inverter command speed except 0 rps. (b) Detail of anti-frost operation Inverter command...
  • Page 25 (6) Low load starting (a) When the unit is started with calculated speed of less than 60(30) rps, it is operated with 60(30) rps for 80(60) seconds, then the operation is moved to the command speed. (b) The indoor fan corresponds to the operation mode. Cooling: Speed corresponding to the command speed of air flow switching Dehumidification: Speed decided in the operation region Heating: The lower one between the speed corresponding to the command speed and the hot keep speed...
  • Page 26 (12) Freezing cycle system protective control (a) Operating conditions: When both of following conditions have continued for more than 5 minutes later than 5 minutes after the start of operation. 1) Command speed is higher than 60 rps 2) During cooling, dehumidifying: Indoor heat exchanger temperature - Room temperature > –4ºC During heating: Indoor heat exchanger temperature - Room temperature <...
  • Page 27 (15) High pressure control (a) Purpose: Prevents anomalous high pressure operation during heating. (b) Detector: Indoor unit heat exchanger sensor (Th2) (c) Detail of operation: (Example) Fuzzy 8 rps After lapse of 20 Sec. or over 8 rps After lapse of 20 Sec. or over Lower limit After lapse of 20 Sec.
  • Page 28 ◆ 50 type <I> (a) Operating conditions: When the outdoor air temperature sensor (Th5) is 4ºC or lower continues for 5 minutes while the outdoor speed is other than 0 rps. (b) Operation content: When the command speed is less than 22 rps, the command speed is forcibly set at 22 rps. However, when the thermo becomes OFF, the speed is reduced to 0 rps.
  • Page 29 ◆ < II > (a) Operating conditions: When the outdoor air temperature sensor (Th5) is 22ºC or lower continues for 30 seconds while outdoor speed is other than 0rps. (b) Detail of operation: ◆ 20~35 type 1 The lower limit of inverter command speed is set to 30 rps and even if the speed becomes lower than 30 rps, the speed is kept to 30 rps.
  • Page 30 (18) Stop mode (a) Operating conditions: When the operation mode is changed, when the dehumidifying operation is changed from the heating oriented mode to the cooling oriented mode or vice versa, or when the inverter speed turns to 0 rps. [When 0 rps is commanded from the indoor unit controller, or when an outdoor protective function is actuated] (b) Detail of operation ◆...

  • Page 31: 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 32: Selection Of Location For Installation

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

  • Page 33: Installation Of Indoor Unit

    5.2 Installation of indoor unit (1) Installation of installation board (a) 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 34 (3) Preparation of indoor unit (a) 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 35 [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 36: Installation Of Outdoor Unit

    5.3 Installation of outdoor unit (1) Installation of outdoor unit Make sure that sufficient space for installation and service is secured. 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. Attach a drain elbow, etc.
  • Page 37 (3) Air purge Tighten all flare nuts in the pipings both indoor and outside will so as not to cause leak. Connect service valve, charge hose, manifold valve and vacuum pump as is illustrated below. 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 38: Test Run

    (b) It is very important to be careful of above when plugging in the unit to an already furnished electrical outlet. (4) Explain to the customer on the correct usage of the air conditioner in simple layman’s terms. (5) Make sure that drain flows properly. (6) Standard operation data (220/230/240V) Model SRK20ZFX-S SRK25ZFX-S SRK35ZFX-S SRK50ZFX-S Item –...

  • Page 39: Maintenance Data

    6. MAINTENANCE DATA 6.1 Troubleshooting procedures for electrical equipment (1) 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 40 (4) 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 pages 39. Is an error code displayed by Using the Service Mode, access the self-diagnosis the self-diagnosis function?
  • Page 41 (5) 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 42 (6) 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.
  • Page 43 *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.) •...
  • Page 44 2 Stop data Remote control setting Displayed data Operation Fan speed Temperature switching switching setting Cooling 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. 23°C Displays the reason for the stop (stop code) 3 times previous when the air conditioner was stopped by protective stop control.
  • Page 45 Number of flashes when in service mode Stop code Error content Auto Error Occurrence conditions Cause TIMER recovery display light Error code light Minor category Major category (10’s digit) (1’s digit) Current Overcharge 4 time 1 time Cooling overload 1 When there is a current safe stop in overload 1 mode safe Compressor lock...
  • Page 46 Note (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.
  • Page 47 (v) Indoor 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) Buzzer sound (minus) (sounds for 0.1 second) (does not sound) * If no data are recorded (error code is normal), the display for each sensor becomes as shown below.
  • Page 48 (vi) Discharge pipe temperature table Units: °C TIMER light (1’s digit) RUN light (10’s digit) Buzzer sound (minus) (sounds for 0.1 second) (does not sound) * If no data are recorded (error code is normal), the display for each sensor becomes as shown below. Sensor value displayed when the error code is normal Sensor name -64°C...
  • Page 49 Service data record form Customer Model Date of investigation Machine name Content of complaint Display results Remote control settings Display content Content of displayed data Temperature setting Operation switching Fan speed switching Buzzer (Yes/No.) RUN light (Times) TIMER light (Times) Error code on previous occasion.

  • Page 50: Current Cut

    (7) 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 51 [Gas shortage, defective discharge Over heat of compressor pipe sensor] Is discharge pipe sensor Connector connection check, resistance resistance value good? value check, replacement of discharge pipe (page 48) sensor Check if there are any Does trouble persist after Is sufficient quantity of refrigerant places where gas is leaking.
  • Page 52 [Broken power transistor Trouble of outdoor unit broken compressor wire] Is output voltage applied to all 3 Defective inverter phases of power transistor? (Refer to page 46 for details) Is compressor wiring connected Connect securely. securely? Inspect compressor. [Defective fan motor, connector Indoor fan motor error poor connection, defective PCB] Is connector connection good?
  • Page 53 [Compressor defect, outdoor Rotor lock unit circuit defect] Is output voltage applied to all 3 Defective inverter phases of power transistor? ¡ Check compressor wiring visually. If check results are normal, Inspect compressor. ¡ Check insulation resistance. (1 MΩ or over) compressor is locked.
  • Page 54 (9) Checking the indoor electrical equipment (a) Indoor unit circuit board check procedure 1) Turn off the power. 2) Disconnect the wires connected between the indoor and outdoor units at the terminal block. (They can be disconnected at either the indoor or outdoor unit’s terminal block.) 3) Turn on the power.
  • Page 55 (10) How to make sure of remote control Is remote Remote control control defects normal? Replace the display. Again pushing operating switch Is the unit operable with remote Normal control? Abnormality is not Operating the unit? found. Defective remote control Does unit ON/OFF button operates? Note (1) Check method of remote control...
  • Page 58 ◆ 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.

  • Page 59: Servicing

    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.

  • Page 60: Refrigerant Piping Installation/Servicing Manual For Air Conditioners Using R410A

    REFRIGERANT PIPING INSTALLATION/SERVICING MANUAL FOR AIR CONDITIONERS USING R410A (These materials are extracted from document issued by The Japan Refrigeration and Air Conditioning Industry Association) 7.1 Outline 7.1.1 Refrigerant R410A (1) Adoption of R410A in air conditioners In 1974, it was pointed out that the ozone layer in the upper stratosphere (about 20 ~ 40 km above ground) might have been damaged by the ozone depleting substances such as CFC (chlorofluorocarbon) and HCFC (hydrochlorofluorocarbon).

  • Page 61: Refrigerant Piping Installation

    (3) Lubricating oils for R410A As the lubricating oils for R22, mineral oils, alkylbenze synthetic oils, etc. have so far been used. As R410A features less solubility with these conventional lubricating oils such as mineral oils, the lubricating oils tend to stay within the refrigeration cycle. As the lubricating oils highly soluble with R410A, ester, ethereal and other synthetic oils are available.
  • Page 62 (2) Joints For copper pipes, flare joints or socket joints are used. Prior to use, be sure to remove all contaminants. a) Flare joints Flare joints used to connect the copper pipes cannot be used for pipings whose outer diameter exceeds 20 mm. In such a case, socket joints can be used.
  • Page 63 d) Flare processing øD Make certain that a clamp bar and copper pipe have been cleaned. By means of the clamp bar, perform the flare processing correctly. Use either a flare tool for R410A or conventional flare tool. Flare processing dimensions differ according to the type of flare tool. Be careful. When using a conventional flare tool, be sure to secure “dimension A”...

  • Page 64: Storage Of Piping Materials

    Table 8. Flare and flare nut dimensions for R22 [unit: mm] Dimension (mm) Nominal Outer diameter Thickness Flare nut width diameter (mm) (mm) 6.35 9.52 13.0 13.5 12.70 16.2 16.0 12.9 15.88 19.4 19.0 16.0 (2) Flare connecting procedures and precautions a) Make sure that the flare and union portions do not have any scar or dust, etc.
  • Page 65 (2) Identification a) Piping set A copper pipe as piping set for R410A must have a thickness as stated in Table 3 (see on page 59), and, as shown in Tables 5 and 6 (see on page 61), it also differs from R22 in flare processing and flare nut dimensions. So, it is necessary to choose a piping set suitable for R410A.
  • Page 66 (3) Flux a) Reasons for the use of flux • By removing the oxide film and any foreign matter on the metal surface, it assists the flow of brazing filler. • In the brazing process, it prevents the metal surface from being oxidized. •...

  • Page 67: Installation, Removal And Servicing

    Reducing valve Flow meter Stop valve From the nitrogen cylinder Piping Nitrogen gas Rubber plug for sealing Fig.5 Prevention of oxidation during brazing * Cautions during brazing 1 General cautions 1) The brazing strength should be high as required. 2) After operation, airtightness should be kept under a pressurized condition. 3) During brazing do not allow component materials to become damaged due to overheating.
  • Page 68 (1) Tools exclusive for R410A a) Gauge manifold • As R410A is characterized by high pressure, conventional tools cannot be used. Table 11. Differences between conventional high/low pressure gauges and those for R410A Conventional gauges Gauges exclusive for R410A High pressure -0.1~3.5MPa -0.1~5.3MPa gauge (red)
  • Page 69 e) Flare tool (clutch type) • A flare tool for R410A is provided with a large clamp bar receiving hole so that the projection of the copper pipe from the clamp bar can be set at 0~0.5 mm in flare processing, and also features higher spring strength for increased expansion pipe torque.
  • Page 70 7.3.2 New installation work (when using new refrigerant piping) (1) Air purge by vacuum pump and gas leakage inspection (see Fig. 6) a) Connect the charge hose to the outdoor unit. 1 b) Connect the charge hose to the vacuum pump adapter. 2 At this time, keep the control valves in the fully closed position.
  • Page 71 f) After charging liquid refrigerant into the air conditioner by closing the charging valve, stop operation by fully closing the gauge manifold’s valve Lo. 2 5 g) Quickly remove the charge hose from the service port. 6 When stopped halfway, refrigerant being cycled will be released. h) After securing the caps on the service port and control valve, check the caps’...

  • Page 72: Refrigerant Recovery

    7.3.6 Refrigerant recharging at servicing When it becomes necessary to recharge refrigerant, charge the specified amount of new refrigerant according to the following steps. (For details, see the instruction manual prepared by the equipment manufacturer) 1) Connect the charge hose to the outdoor unit’s service port. 2) Connect the charge hose to the vacuum pump adapter.
  • Page 73 (4) Recovering procedures a) According to the instructions for handling the refrigerant recovering equipment (described in the attached instruction manual), operate the equipment to recover refrigerant. b) During the operation, take care of the following cautions. 1 Ascertain that the refrigerant recovering equipment is running as required and always monitor the state of operation so that adequate steps can be taken in an emergency.
  • Page 74 b) Charge hose (pressure resistant hose for fluorocarbon) and packing • It is 1/4B in thickness and available in various lengths, etc. • Use a hose whose pressure resisting performance is higher than 5.2 MPa (52 kg/cm • Generally, a setting fixture is provided only on one end. (4) Gauge manifold Hose Setting...
  • Page 75 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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