Mitsubishi Heavy Industries SRK Series Specifications

- 3 -INVERTER WALL MOUNTED TYPEROOM AIR-CONDITIONER( Split system, air to air heat pump type )SRK20ZGX-S, 25ZGX-S, 35ZGX-S, 50ZGX-STECHNICAL MANUA

- 8 -2.4 Piping system Models SRK20ZGX-S, 25ZGX-S, 35ZGX-SOutdoor unitIndoor unitRoom temp.sensorHeatexchangerFlare connectionHeatexchangersen

- 9 -2.5 Selection chartCorrect the cooling and heating capacity in accordance with the conditions as follows. The net cooling and heating capacity ca

- 10 -3 ELECTRICAL DATA3.1 Electrical wiringModels SRK20ZGX-S, 25ZGX-S, 35ZGX-SIndoor unit Outdoor unitLMFMISM52CPRINTED CIRCUITBOARDPRINTED CIRCUIT

- 11 -Model SRK50ZGX-SIndoor unitOutdoor unitLMFMISMPRINTED CIRCUITBOARD220/230/240V 50Hz1 PhasePOWER SOURCEColor symbolMeaning of marks SymbolParts

- 12 -S Indication sectionModels All modelsS Operation section4 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER4.1 Operation control function by remote

- 13 -4.2 Unit ON/OFF buttonWhen the remote control batteries become weak, or if the remote control is lost or malfunctioning, this button may be used

- 14 -4.4 Custom cord switching procedureIf two wireless remote controls are installed in one room, in order to prevent wrong operation due tomixed si

- 15 -4.7 Outline of heating operation(1) Operation of major functional components in heating mode(2) Details of control at each operation mode (patte

- 16 -27.525.519.518304.8 Outline of cooling operation(1) Operation of major functional components in Cooling mode(2) Detail of control in each mode

- 17 -4.10 Protective control function(1) Frost prevention for indoor heat exchanger (During cooling or dehumidifying)(a) Operating conditions(i) Indo

- 1 -CONTENTS1. GENERAL INFORMATION ... 11.1 Specific features ...

- 18 -Notes (1) RPSmin: The lower one between the outdoor unit speed and the command speedNote (2) Values in ( ) are for Type 50.¡ Temperature listAB

- 19 -(5) Heating overload protective control(a) Operating conditions: When the unit is operating with the outdoor unit speed other than 0 rps or when

- 20 -(7) Compressor overheat protection(a) Purpose: It is designed to prevent deterioration of oil, burnout of motor coil and other trouble resulting

- 21 -(12) Indoor fan motor protectionWhen the air conditioner is operating and the indoor fan motor is turned ON, if the indoor fan motor has operate

- 22 -5 APPLICATION DATASAFETY PRECAUTIONS¡ Please read these “Safety Precautions” first then accurately execute the installation work.¡Though the pre

- 23 -5.1 Selection of location for installation(1) Indoor unit(a) Where there is no obstructions to the air flow and where the cooledair can be even

- 24 -Fixing on concrete wallUse of nut anchor Use of bolt anchorBolt(M6 × 12)MountingboardNut(M6)MountingboardMax. 10Adjustment of the installation b

- 25 -(3) Preparation of indoor unit(a) Mounting of connecting wires1) Remove the lid.2) Remove the wiring clamp.3) Connect the connecting wire secure

- 26 -[Drain hose changing procedures]1. Remove the drain hose.¡ Remove the drain hose,making it rotate.Since this air conditioner has been designed t

- 27 -5.3 Installation of outdoor unit(1) Installation of outdoor unit(a) Make sure that sufficient space for installation and service is secured.(b)

- 1 -Over heat of compressorError of signal transmissionOutdoor fan motor error1 GENERAL INFORMATION1.1 Specific featuresThe “MITSUBISHI HEAVY INDUSTR

- 28 -(3) Air purge(a) Tighten all flare nuts in the pipings both indoor and outside will so as not to cause leak.(b) Connect service valve, charge ho

- 29 -5.5 Test run(1) Conduct trial run after confirming that there is no gas leaks.(2) When conducting trial run set the remote control thermostat to

- 30 -6. MAINTENANCE DATA6.1 Troubleshooting procedures for electrical equipment(1) Cautions1 If you are disassembling and checking an air conditioner

- 31 -(4) Troubleshooting procedure (If the air conditioner runs)Note (1) Even in cases where only intermittent stop data are generated, the air condi

- 32 -(5) Self-diagnosis tableWhen this air conditioner performs an emergency stop, the reason why the emergency stop occurred is displayed by the fla

- 33 -(6) Service mode (Trouble mode access function)This air conditioner is capable of recording error displays and protective stops (service data) w

- 34 -*3: To count the number of flashes in the service mode, count the number of flashes after the light lights up for 1.5 secondinitially (start sig

- 35 -2 Stop dataRemote controller settingFan speedswitchingOperation switchingDisplayed dataTemperaturesetting(iii) Error code, stop code table (Assi

- 36 -4 timeflash1 timeflash2 timeflash3 timeflash4 timeflash5 timeflash6 timeflash1 timeflash2 timeflashOFF6 timeflashOFF7 timeflash1 timeflash8 time

- 37 -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)

- 2 -2 SELECTION DATA2.1 SpecificationsModel SRK20ZGX-S (Indoor unit)SRC20ZGX-S (Outdoor unit)ItemModelSRK20ZGX-S SRC20ZGX-SCooling capacity(1)W 2000

- 38 -(v) Indoor temperature sensor temperature, indoor heat exchanger sensor temperature, outdoor airtemperature sensor temperature, outdoor heat exc

- 39 -(vi) Discharge pipe temperature tableBuzzer sound (minus)TIMER light(1’s digit)RUN light(10’s digit)Yes(sounds for 0.1 second)No(does not sound)

- 40 -Service data record form

- 41 -Current cut[Open phase on compressor outputterminal, compressor lock](7) Inspection procedures corresponding to detail of troubleSensor error[Br

- 42 -Trouble of outdoor unit[Broken power transistorbroken compressor wire]Outdoor fan motor error[Defective fan motor, connectorpoor connection, de

- 43 -Over heat of compressor[Gas shortage, defective dischargepipe sensor]Error of signal transmission[Wiring error including power cable, defective

- 44 -Rotor lock[Compressor defect, outdoorunit circuit defect]NOYES¡ Check compressor wiring visually.¡ Check insulation resistance. (1 MΩ or over)¡

- 45 -(9) Checking the indoor electrical equipment(a) Indoor unit circuit board check procedure1) Turn off the power.2) Disconnect the wires connected

- 46 -(10) How to make sure of remote controlNote (1) Check method of remote control(a) Press the reset switch of the remote control.(b) If all LCD ar

- 47 -250V 15AF POWERTRANSISTORCMFMO20SEEVL◆ Inspection of resistance value of sensor◆ Inspection of electronic expansion valve To test if there i

- 3 -ItemModelSRK25ZGX-S SRC25ZGX-SCooling capacity(1)W 2500 (500 ~ 3000)Heating capacity(1)W 3000 (500 ~ 5000)Power source 1 Phase, 220-240V, 50HzCoo

- 48 -◆ Inspection of resistance value of sensor◆ Inspection of electronic expansion valve To test if there is voltage.◆ Check point of outdoor uni

- 49 -◆ Power transistor inspection procedure(ii) DC Fan motor resistance checkNotes (1) Remove the fan motor and measure it without power connected t

- 50 -6.2 Servicing(1) EvacuationThe evacuation is an procedure to purge impurities...noncondensable gas, air, moisture from the refrigerant equipm

- 51 -7 REFRIGERANT PIPING INSTALLATION/SERVICINGMANUAL FOR AIR CONDITIONERS USING R410A(These materials are extracted from document issued by The Jap

- 52 -(3) Lubricating oils for R410AAs the lubricating oils for R22, mineral oils, alkylbenze synthetic oils, etc. have so far been used. As R410A fea

- 53 -(2) JointsFor copper pipes, flare joints or socket joints are used. Prior to use, be sure to remove all contaminants.a) Flare jointsFlare joints

- 54 -d) Flare processingMake certain that a clamp bar and copper pipe have been cleaned.By means of the clamp bar, perform the flare processing corre

- 55 -(2) Flare connecting procedures and precautionsa) Make sure that the flare and union portions do not have any scar or dust, etc.b) Correctly ali

- 56 -(2) Identificationa) Piping setA copper pipe as piping set for R410A must have a thickness as stated in Table 3 (see on page 52), and, as shown

- 57 -(3) Fluxa) 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 f

- 4 -ItemModelSRK35ZGX-S SRC35ZGX-SCooling capacity(1)W 3500 (500 ~ 3900)Heating capacity(1)W 4200 (500 ~ 5100)Power source 1 Phase, 220-240V, 50HzCoo

- 58 -* Cautions during brazing1 General cautions1) The brazing strength should be high as required.2) After operation, airtightness should be kept un

- 59 -(1) Tools exclusive for R410Aa) Gauge manifold• As R410A is characterized by high pressure, conventional tools cannot be used.• In order to prev

- 60 -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

- 61 -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 th

- 62 -f) After charging liquid refrigerant into the air conditioner by closing the charging valve, stop operation by fully closing thegauge manifold’s

- 63 -7.3.6 Refrigerant recharging at servicingWhen it becomes necessary to recharge refrigerant, charge the specified amount of new refrigerant accor

- 64 -(4) Recovering proceduresa) According to the instructions for handling the refrigerant recovering equipment (described in the attached instructi

- 65 -b) Charge hose (pressure resistant hose for fluorocarbon) and packing• It is 1/4B in thickness and available in various lengths, etc.• Use a hos

- 2 -INVERTER WALL MOUNTED TYPEROOM AIR-CONDITIONER

- 5 -Model SRK50ZGX-S (Indoor unit)SRC50ZGX-S (Outdoor unit)ItemModelSRK50ZGX-S SRC50GX-SCooling capacity(1)W 5000 (600~5300)Heating capacity(1)W 6000

- 6 -2.2 Range of usage & limitationsIndoor return air temperature(Upper, lower limits)Refrigerant line (one way) length Max. 15mSRK20ZGX-S, 25ZGX

- 7 -(2) Outdoor unit Models SRC20ZGX-S, 25ZGX-S, 35ZGX-SModel SRC50ZGX-S