Mitsubishi Heavy Industries TC-PSA-25W-E, Technical Manual

Page 1: ... BOVBM P h t43 5 INVERTER RESIDENTIAL AIR CONDITIONERS Split system air to air heat pump type Ceiling cassette 4way compact type 5 7 5 7 TECHNICAL MANUAL ...

Page 2: ...ion of outdoor unit 22 9 1 Wired remote controller option parts 29 9 2 Operation control function by the wired remote controller 30 9 3 Operation control function by the indoor controller 31 9 4 Operation control function by the outdoor controller 40 46 10 1 Diagnosing of microcomputer circuit 46 3 Troubleshooting at the indoor unit 49 1 Selfdiagnosis function 46 2 Troubleshooting procedure 49 10 ...

Page 3: ... RC E5 95 11 2 Wireles kit RCN TC 24W ER 11 OPTION PARTS 95 11 3 Simple wired remote controoller RCH E3 How to read the model name Example Indoor unit Outdoor unit SRC 25 Z Series code Inveter type Product capacity Model name Outdoor unit JX S FDTC 25 VF Series code Product capacity Model name Ceiling cassette 4way compact type 101 105 ...

Page 4: ... Polyurethane form Electric heater W Remote controller wired RC E5 RC EX1A option wireless RCN TC 24W ER option Room temperature control Thermostat by electronics Safety equipment Overload protection for fan motor Frost protection thermostat Internal thermostat for fan motor Abnormal discharge temperature protection Installation data Refrigerant piping size mm Liquid line I U φ6 35 1 4 Pipe φ6 35 ...

Page 5: ...se heat Polyurethane form Electric heater W Remote controller wired RC E5 RC EX1A option wireless RCN TC 24W ER option Room temperature control Thermostat by electronics Safety equipment Overload protection for fan motor Frost protection thermostat Internal thermostat for fan motor Abnormal discharge temperature protection Installation data Refrigerant piping size mm Liquid line I U φ6 35 1 4 Pipe...

Page 6: ...han 2x2 grid ceiling G Obstacle 1000 1000 or more 600 295 Remote controller 19 口120 Max Drain lift or less 325 Space for installation and service or more Option Make a space of 4000 or more between the units when installing more than one Air outlet opening for ducting 6 Ø4 Holes for Hole 60 140 100 100 88 140 tapping screws A B C F 145 325 570 45 or more 132 192 35 88 210 248 Hanger plate for susp...

Page 7: ...ch a direction that the blower outlet faces perpendicularly to the dominant wind direction 4 Leave 1m or more space above the unit 5 A wall in front of the blower outlet must not exceed the units height 6 The model name label is attached on the lower right corner of the front panel φ9 52 3 8 Flare Content C Pipe cable draw out hole E Anchor bolt hole Drain discharge hole Symbol B A Service valve c...

Page 8: ... 12 SRK T 126 3 Wired remote controller option parts Model RC E5 PJZ000Z295 ...

Page 9: ... BK BK BK 10 BK 11 BK 12 BK 13 BK 14 BK 15 BK 16 BK 17 BK BK 18 BK 19 BK 20 BK 1 2 3 4 5 BK BK BK BK BK BK BK BK BK BK BK BK BK BK BK BK BK BK BK BK BK 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 I FS LM1 4 DM FM Float switch Drain motor Fan motor Louver motor Indication lamp Red Inspection Indication lamp LED 3 F200 203 Fuse LED 2 Connector CNB Z Green Normal operation Model capacity setting SW6 Operation chec...

Page 10: ... country The cable specifications are based on the assumption that a metal or plastic conduit is used with no more than three cables contained in a conduit and a voltage drop is 2 For an installation falling outside of these conditions please follow the internal cabling regulations Adapt it to the regulation in effect in each country 25 8 2 0 32 1 5mm2 x 3 1 5mm2 35 3 1 2 N 220ｰ240V 50Hz 220V 60Hz...

Page 11: ...Hz 10 20 30 40 50 60 70 10 20 30 40 50 60 70 63 125 250 500 1000 2000 4000 8000 Outdoor Unit Model SRC25ZJX S Noise Level Cooling 47 dB A Heating 47 dB A 10 20 30 40 50 60 70 63 125 250 500 1000 2000 4000 8000 Mid Octave Band frequency Hz Sound Pressure Level dB standard 2 10 5 Pa 10 20 30 40 50 60 70 N50 N40 N60 N70 N20 N30 Cooling Heating Condition ISO T1 JIS C9612 4 NOISE LEVEL Model FDTC25VF ...

Page 12: ...ing Condition ISO T1 JIS C9612 10 20 30 40 50 60 70 63 125 250 500 1000 2000 4000 8000 Mid Octave Band frequency Hz Sound Pressure Level dB standard 2 10 5 P a 10 20 30 40 50 60 70 N50 N30 N40 N60 N70 N20 N50 N30 N40 N60 N70 N20 Sound Pressure Level dB standard 2 10 5 Pa 10 20 30 40 50 60 70 10 20 30 40 50 60 70 Mid Octave Band frequency Hz 63 125 250 500 1000 2000 4000 8000 Model FDTC35VF ...

Page 13: ...anger Heat exchanger sensor Electronic expansion valve Liquid Strainer Capillary tube Outdoor air temp sensor Muffler Muffler Compressor Accumlator Discharge pipe temp sensor Cooling cycle Heating cycle Check joint 4way valve Service valve Heat exchanger sensor Th22 TH3 Room temp sensor Th1 Th21 Gas TH2 Heat exchanger sensor TH1 EEV Capillary tube Heat exchanger Muffler ...

Page 14: ...tely 15 to 21 D B 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 specication Correction factors as follows 1 Coefcient of cooling and heating capacity in relation to temperatures 0 6 0 7 0 8 0 9 1 0 1 2 1 1 1 3 0 5 10 15 24 26 20 25 30 35 4...

Page 15: ...er during heating How to obtain the cooling and heating capacity Piping length m Cooling Heating 7 1 0 1 0 10 0 99 1 0 15 0 975 1 0 20 0 965 1 0 25 0 95 1 0 30 0 935 1 0 Air inlet temperature of outdoor unit in CWB Adjustment coefficient 15 0 95 0 95 0 94 0 93 0 91 0 88 0 86 0 87 0 92 1 00 10 9 7 5 3 1 1 3 5 or more 3600 3510 FDTC35VF The net cooling capacity of the model FDTC35VF with ...

Page 16: ...29 2 17 2 43 2 17 2 61 2 33 2 69 2 32 2 75 2 30 2 90 2 43 3 01 2 39 32 2 22 2 10 2 36 2 14 2 55 2 31 2 64 2 30 2 70 2 28 2 85 2 42 2 96 2 36 34 2 15 2 04 2 29 2 11 2 49 2 28 2 58 2 28 2 64 2 26 2 79 2 39 2 91 2 35 35 2 12 2 01 2 26 2 10 2 46 2 27 2 55 2 27 2 61 2 25 2 77 2 39 2 89 2 34 36 2 08 1 97 2 22 2 08 2 43 2 25 2 52 2 25 2 58 2 24 2 74 2 38 2 86 2 33 38 2 01 1 91 2 15 2 04 2 36 2 23 2 46 2 ...

Page 17: ... 16 12 SRK T 126 8 1 Installation of indoor unit 8 APPLICATION DATA 22 ...

Page 18: ...ion bolt becomes longer do reinforcement of earthquake resistant For grid ceiling When suspension bolt length is over 500mm or the gap between the ceiling and roof is over 700mm apply earthquake resistant brace to the bolt In case the unit is hanged directly from the slab and is installed on the ceiling plane which has enough strength When suspension bolt length is over 1000mm apply the earthquake...

Page 19: ...the screw within 5mm left to the nut l Do not apply adhesives on this end Drain socket The step part Drain hose No adhesive allowed Drain socket Metal plate 10mm Hose clamp Fasten the screw within 5 mm left to the nut Drain hose 2 Prepare a joint for connecting VP 20 pipe adhere and connect the joint to the drain hose the end made of rigid PVC and adhere and connect VP 20 pipe prepare on site As f...

Page 20: ... of the country and be executed according to the technical standards and other regulations applicable to electrical installation in the country Be sure to use an exclusive circuit l Use specified cord fasten the wiring to the terminal securely and hold the cord securely in order not to apply unexpected stress on the terminal l Do not put both power source line and signal line on the same route It ...

Page 21: ... 20 12 SRK T 126 a PJA012D783 See page 16 ...

Page 22: ...T 126 5 7 9 1 1 This function is not able to be set with wireless remote controls or simple remote control RCH H3 2 For setting the swing range of other louvers return to 1 and proceed same procedure respectively ...

Page 23: ...e the unit failure and serious accidents due to burst of the refrigerant circuit Tighten the flare nut by torque wrench with specified method If the flare nut were tightened with excess torque this may cause burst and refrigerant leakage after a long period Do not open the operation valves for liquid line and gas line until completed refrigerant piping work air tightness test and evacuation If the...

Page 24: ...where discharged hot air or operating sound of the outdoor unit can bother neighborhood Locations where outlet air of the outdoor unit blows directly to plants Locations where vibration can be amplified and transmitted due to insufficient strength of structure Locations where vibration and operation sound generated by the outdoor unit can affect seriously on the wall or at the place near bed room ...

Page 25: ...re must be a 1 meter or larger space in the above When more than one unit are installed side by side provide a 250mm or wider interval between them as a service space In order to facilitate servicing of controllers please provide a sufficient space between units so that their top plates can be removed easily Where a danger of short circuiting exists install guide louvers When more than one unit ar...

Page 26: ...brazing When pipe is brazing 3 Refrigerant pipe wall thickness and material Select refrigerant pipes of the table shown on the right wall thickness and material as specified for each pipe size Pipe diameter mm Minimum pipe wall thickness mm Pipe material 6 35 0 8 O type pipe 9 52 0 8 O type pipe NOTE Phosphorus deoxidized seamless copper pipe ICS 23 040 15 ICS 77 150 30 Select pipes having a wall ...

Page 27: ...b Then raise the pressure to 1 5 MPa and stop Leave it for five more minutes to see if the pressure drops c Then raise the pressure to the specified level 4 15 MPa and record the ambient temperature and the pressure d If no pressure drop is observed with an installation pressurized to the specified level and left for about one day it is acceptable When the ambient Temperature fall 1 the pressure a...

Page 28: ... Electrical installation work must be executed according to the technical standards and other regulations applicable to electrical installations in the country Do not use any supply cord lighter than one specified in parentheses for each type below braided cord code designation 60245 IEC 51 ordinary tough rubber sheathed cord code designation 60245 IEC 53 flat twin tinsel cord code designation 602...

Page 29: ...ts with heaters refer to the installation instructions or the construction instructions of the indoor unit Switchgear or Circuit breaker capacity which is calculated from MAX over current should be chosen along the regulations in each country The cable specifications are based on the assumption that a metal or plastic conduit is used with no more than three cables contained in a conduit and a volt...

Page 30: ... the auto static pressure adjustment mode Cover AIR CON No button Display the indoor unit number connected to this remote controller CHECK button This button is used at servicing TEST button This button is used during test operation Weekly timer display Displays the settings of the weekly timer Operation setting display area Displays setting temperature airflow volume operation mode and oparation ...

Page 31: ...peration mode Airflow volume mode Room temperature setting Louver auto swing stop However the stop position 4 position is cancelled so that it returns to Position 1 Remote controller function items which have been set with the remote controller function setting Indoor function items are saved in the memory of indoor unit Upper limit value and lower limit value which have been set with the temperat...

Page 32: ...e Outdoor unit fan Indoor unit fan Louver motor Drain pump 3 2 2 Thermostat ON Thermostat OFF 2 2 Note 1 Operation Stop Turned ON OFF by the control other than the room temperature control 2 ON during the drain motor delay control 3 Drain pump ON setting may be selected with the indoor unit function setting of the wired remote controller c Dehumidifying operation 1 When the humidity sensor is not ...

Page 33: ...ower ON This is not displayed under the Remote mode 2 If this display is not shown under the Center Remote mode check if the indoor unit power switch is turned on or not f Hot start Cold draft prevention at heating At the startup of heating operation at resetting of the thermostat during defrost operation and at returning to heating the indoor fan is controlled by the indoor heat exchanger tempera...

Page 34: ...sensor is effective i Filter sign As the operation time Total ON time of ON OFF switch accumulates to 180 hours 1 FILTER CLEANING is displayed on the remote controller This is displayed when the unit is in trouble and under the centralized control regardless of ON OFF Note 1 Time setting for the filter sign can be made as shown below using the indoor function of wired remote controller FILTER SIGN...

Page 35: ...ation mode If the thermostat is turned OFF during the forced operation control of heating compressor the louver position with the auto swing is returned to the level position Note 1 The compressor stops when it has entered the protective control l Drain motor 1 Drain motor DM is operated during the cooling or dehumidifying mode operations and simultaneously with the compressor ON The DM continues ...

Page 36: ... selection of indoor fan speed refer to item 2 10 1 0 Indoor heat exchanger temperature C Fan operation Cooling operation SRC40 60 FDC100 140 Model Symbol A 4 4 1 1 1 0 1 0 2 5 2 5 B C D 2 Selection of indoor fan speed If it enters the frost prevention control during cooling operation excluding dehumidifying the indoor unit fan speed is switched a When the indoor return air detection temperature d...

Page 37: ...hat unit stops with the anomalous stop but any other normal units continue to run as they are ii Signal wiring procedure Signal wiring between indoor and outdoor units should be made on each unit same as the normal wiring For the group control lay connect with sires wiring between rooms using terminal blocks X Y of remote controller Connect the remote controller communication wire separately from ...

Page 38: ...l and start stop operation of the unit from the wired remote controller becomes not available 2 In case that Operation permission prohibition mode setting is Valid and External input setting is Pulse input Local setting When card key switch is ON Operation permission the unit starts operation in conjunction with ON signal and also start stop operation of the unit from the wired remote controller b...

Page 39: ... input Unit A Unit B Note The latest operation has priority It is available to operate stop by remote controller or center controller b In case of Pulse input setting Local setting It is effective only when the input signal to CnT 6 is changed OFF ON and at that time unit operation ON OFF is inverted ON ON OFF OFF OFF OFF ON ON ON OFF OFF CnT 6 input Unit A Unit B 3 Remote operation a In case of m...

Page 40: ...ext sampling present number of revolutions of indoor unit fan speed is reduced by 10min 1 3 End conditions Indoor fan speed is reduced to the setting airflow volume when the compressor OFF is established and at 30 minutes after the start of heating operation w Room temperature detection temperature compensation during heating With the standard specification the compressor is turned ON OFF with the...

Page 41: ...ature 20 20 15 10 5 0 5 10 15 10 5 0 Outdoor air temperature Outdoor heat exchanger temperature Defrost operation start Defrost operation start D efrost operation start tem perature D efrost operation start tem perature Models 20 35 Model 50 e During continuous compressor operation In addition when the speed command from the indoor controller of the indoor unit during heating operation has counted...

Page 42: ...e of 58 63 ºC the speed is reduced by 6 rps at each 30 seconds 2 When the temperature is 63 ºC or higher the compressor is stopped 3 When the outdoor heat exchanger temperature is in the range of 53 58 ºC if the compressor command speed is been maintained and the operation has continued for more than 30 seconds at the same speed it returns to the normal cooling operation Model Item FDTC25 35VF Out...

Page 43: ...malous high pressure operation during heating 2 Detector Indoor heat exchanger sensor THI R 3 Detail of operation Notes 1 When the indoor heat exchanger temperature is in the range of B C ºC the speed is reduced by 4 rps at each 20 seconds 2 When the indoor heat exchanger temperature is in the range of C D ºC the speed is reduced by 8 rps at each 20 seconds When the temperature is D ºC or higher c...

Page 44: ...he discharge pipe temperature is in the range of 90 100ºC even when the compressor command speed is maintained for 3 minutes when the temperature is in the range of 90 100ºC the speed is raised by 1 rps and kept at that speed for 3 minutes This process is repeated until the command speed is reached 4 Lower limit speed Cooling Heating Lower limit speed 20 rps 30 rps Item Model b If the temperature ...

Page 45: ...e following controls Outdoor temperature 10 C Outdoor temperature 10 C 2nd speed Outdoor fan 1st speed Value of A a Outdoor heat exchanger temperature 21ºC After the outdoor fan speed drops down to 1 speed for 60 seconds if the outdoor heat exchanger temperature is lower than 21ºC gradually reduce the outdoor fan speed by 1 speed Lower limit 1st speed b 21ºC Outdoor heat exchanger temperature 38ºC...

Page 46: ...in door heat exchanger temperature Th2 have met the conditions in the following table for 5 minutes Compressor speed N Operation mode Cooling Heating Indoor air temperature Th1 Th1 4 Th2 Indoor air temperature Th1 Indoor heat exchanger temperature Th2 Th2 Th1 6 50 N 10 Th1 40 0 Th1 40 50 N 2 Contents of control a When the conditions of 1 above are met the compressor stops b Error stop occurs when ...

Page 47: ...e indoor heat exchanger temperature thermistor defective element broken wire short circuit Poor contact of temperature thermistor connector Replacement repair of temperature thermistor 73 Indoor control PCB Defective indoor control PCB Defective temperature thermistor input circuit Replacement of PCB 1 time flash Keeps flashing Indoor return air temperature thermistor Defective indoor return air t...

Page 48: ...ctive outdoor control PCB Defective temperature sensor input circuit Replacement of PCB Stays OFF Keeps flashing Discharge pipe temperature sensor Defective discharge pipe temperature sensor broken wire or poor connector connection Replacement repair of temperature sensor 85 Outdoor control PCB Defective outdoor control PCB Defective temperature sensor input circuit Replacement of PCB Stays OFF Ke...

Page 49: ...ntinuously after initial communication was established Excessive number of connected indoor units by controlling with one remote controller Whenever excessively connected indoor units is detected after power ON Return air temperature thermistor anomaly 50 C or lower is detected for 5 seconds continuously within 60 minutes after initial detection of this anomalous temperature Indoor heat exchanger ...

Page 50: ...igh voltage circuits and refrigeration cycle judge it according to ordinary inspection methods b Instruction of how to replace indoor control PCB ٨ Read the SAFETY PRECAUTIONS carefully first of all and then strictly follow it during the replacement in order to protect yourself ٨ The precautionary items mentioned below are distinguished into two levels WARNING and CAUTION Both mentions the importa...

Page 51: ...PCB Parts mounting are different by the kind of PCB 〇 ON OFF Part number SW2 Blue Address setting SW5 Master Slave setting SW7 Function setting CNT Blue External switch CNJ White Louver motor CNN Yellow Thermistor Heat exchanger CNI Blue Float SW CNH Black Thermistor Return air CNW3 Red Power PCB CNB White Remote controller CNV2 Black Auto lift CNG Blue CNZ White HA CNE White RAM checker CNC Red H...

Page 52: ...ng connector color should match with the color of connector of the PCB Note 2 6 Let the wiring red and blue pass beneath the yellow green wiring and bind together with band 7 Screw back the terminal of wiring yellow green from PCB T1 T2 T3 that was removed in 1 In that case do not place the crimping part of the wiring under the PCB Note 1 It might not be applicable on some models Note 2 After repl...

Page 53: ...served Powerful mode Valid Reserved keep OFF Test run Drain motor Normal Test run Valid Invalid Normal Model selection As per model See table 1 Remarks Address No setting at plural indoor units control by 1 R C 0 F Switches Description Default setting Table 1 Indoor unit model selection with SW6 1 SW6 4 0 OFF 1 ON 25VF 35VF 1 0 0 1 0 0 0 0 SW6 4 SW6 1 SW6 2 SW6 3 Default setting ...

Page 54: ...press the button which allows you to go back to the indoor unit selection screen Pressing the button will stop displaying data Pressing the RESET button during remote control unit operation will undo your last operation and allow you to go back to the previous screen If two 2 remote controllers are connected to one 1 inside unit only the master controller is available for trial operation and confi...

Page 55: ...spectively b Operation for judgment 1 Power ON and start check operation on cooling or heating mode 2 Check ON OFF status of 6 LED s on the checker 3 Judge the PCB by ON OFF status of 6 LED s on the checker 4 Stop check operation within about 2minutes after starting check operation ON OFF status of LED If all of LED are ON OFF according to following pattern If all of LED stay OFF or some of LED ar...

Page 56: ...between phases F3 250V 1A F2 250V 20A F8 250V 20A Power supply check Measure the power supply at L N It is normal if it is AC 220 240V Must be conductive When fuse is blown replace it or check wiring DC Reactor continuity Check 50m or higher less than 100mΩ Power transistor module check Is there a short circuit open circuit or damage See 53 page for the check procedure Fuse check There should be c...

Page 57: ...uring operation 72 15 E6 Indoor heat exchanger temperature thermistor anomaly 73 16 E7 Return air temperature thermistor anomaly 74 17 E8 Heating overload operation 75 18 E9 Drain trouble 76 19 E10 Excessive number of connected indoor units more than 17 units by controlling with one remote controller 77 20 E16 Indoor fan motor anomaly 78 21 E19 Indoor unit operation check drain motor check setting...

Page 58: ... or other respective parts NO YES YES NO YES YES YES NO NO Is the compressor operating NO YES NO Note 1 Outdoor 35 C Indoor 27 C 1 WAIT It is normal This unit is designed to start in the soft start mode by detecting the under dome temperature of compressor when it restart after power reset It is necessary to replace to higher capacity one or to install additional unit Compressor refrigerant oil pr...

Page 59: ...ating NO YES NO Note 1 Outdoor 7 C Indoor 20 C 1 WAIT It is normal This unit is designed to start in the soft start mode by detecting the under dome temperature of compressor when it restart after power reset It is necessary to replace to higher capacity one or to install additional unit Compressor refrigerant oil protection control at starting is activated Compressor may be stopped by the error d...

Page 60: ... of refrigerant migrated in the compressor When the earth breaker is activated at lower insulation resistance check the following points 6 hours after power ON check if the insulation resistance recovers to normal When power ON crankcase heater heat up compressor and evaporate the refrigerant migrated in the compressor Check if the earth leakage breaker is conformed to higher harmonic regulation o...

Page 61: ...itting to wall and etc by fixing pipes on the wall or wrapping rubber cushion around the pipe which goes through the hole in the wall or applying other appropriate means Strength of ceiling wall floor etc may be insufficient Review the installing position or reinforce it Check for leaning of installed unit or anomalous mounting of fan louver or motor and specify the contacting point and correct it...

Page 62: ...ur particularly during cooling or defrosting in the heating mode It is normal The noise vibration occurs when the refrigerant starts or stops flowing It is normal When the defrosting starts or stops during heating the refrigerant flow is reversed due to switching 4 way valve This causes a large change in pressure which produces a blowing sound It may accompany also the hissing sounds as mentioned ...

Page 63: ...o recover refrigerant vacuum dry and recharge refrigerant Since there could be many causes of noise vibration the above do not cover all In such case check the conditions when where how the noise vibration occurs according to following check point Indoor outdoor unit Cooling heating fan mode Startup stop during operation Operating condition Indoor outdoor temperatures pressure Time it occurred Ope...

Page 64: ...operable with the remote controller YES NO Does the louver operate at the power on YES NO YES NO Operate after waiting for more than 1 minute Repair wiring Defective indoor control PCB Replace Replace LM Normal Adjust LM lever and then check again 2 Error detection method 3 Condition of Error displayed 4 Presumable cause Defective LM LM wire breakage Faulty indoor control PCB Note Error code Remot...

Page 65: ...for 1 phase unit detected between 1 and 2 on the terminal block of outdoor unit YES YES YES YES Is JX1 open Defective outdoor control PCB Noise filter Misconnection or breakage of connecting wires Defective indoor control or power PCB Replace Replace FM LM etc Replace fuse Defective indoor power PCB Replace Open JX1 Defective indoor control PCB Replace 2 Error detection method 3 Condition of Error...

Page 66: ...ote controller wires NO Is DC15V or higher detected between X Y of indoor unit terminal block YES YES YES YES NO NO NO Correct Replace wires Replace remote controller Defective indoor power PCB Replace Defective indoor control PCB Replace 2 Error detection method 3 Condition of Error displayed 4 Presumable cause Remote controller wire breakage short circuit Defective remote controller Malfunction ...

Page 67: ... reset NO YES YES NO NO NO NO NO YES YES YES Set one remote controller for Master and the other for Slave Set SW1 on remote controller PCB at Master Set address again SW2 on indoor control PCB Separate remote controller wires from high voltage wires Defective indoor control PCB Replace Defective remote controller Change 2 Error detection method Communication between indoor unit and remote controll...

Page 68: ...above 4 Presumable cause Improper setting Surrounding environment Defective remote controller communication circuit Faulty indoor control or power PCB Faulty outdoor control PCB Note If any error is detected 30 minutes after displaying WAIT on the remote controller the display changes to INSPECT I U NO NO NO NO NO Are more than 3 units of remote controller connected Does remote controller display ...

Page 69: ... NO YES WAIT See next page Defective outdoor PCB Replace Defective indoor control PCB Replace Replace indoor control PCB Correct connection wires between indoor and outdoor units Defective outdoor PCB Replace Defective connection wire broken wire Noise Defective indoor control PCB Replace 2 Error detection method 3 Condition of Error displayed 4 Presumable cause Blown fuse Faulty outdoor PCB Conne...

Page 70: ...PCB YES YES NO YES Replace the outdoor control PCB NO Replace the reactor NO Isn t there a short circuit between phases of outdoor PCB Aren t there cracks or burning on the power ransistor module or diode stack Isn t reactor the anomalous Replace fuse 2 Error detection method 3 Condition of Error displayed 4 Presumable cause Blown fuse Faulty outdoor PCB Faulty reactor Note Error code Remote contr...

Page 71: ...perly between the indoor and the outdoor units Is approx DC20V detected between on the outdoor unit terminal block NO YES Is approx DC20V detected between on the indoor unit terminal block YES NO NO Replace fuse Short circuit on remote controller wire Defective remote controller Correct wires Defective outdoor PCB Replace Defective connection wire Broken wire Noise Defective indoor control PCB Rep...

Page 72: ... peripheral environment Defective indoor control PCB Replace Defective remote controller Replace 2 Error detection method When normal communication between the remote controller and the indoor unit is interrupted for more than 2 minutes Detectable only with the remote controller 3 Condition of Error displayed Same as above 4 Presumable cause Defective communication circuit between remote controlle...

Page 73: ...Note 2 Check for faulty connection or breakage of signal wires between indoor outdoor units YES NO YES NO Repair signal wires Repair signal wires Defective outdoor PCB Defective network communication circuit Replace Unit is normal Malfunction by temporary noise etc 2 Error detection method When normal communication between indoor and outdoor unit is interrupted for more than 2 minutes 3 Condition ...

Page 74: ...ndoor control PCB Replace Defective indoor unit heat exchanger temperature thermistor input circuit 2 Error detection method Anomalously low temperature or high temperature resistance is detected on the indoor heat exchanger thermistor ThI R1 R2 or R3 3 Condition of Error displayed When the temperature thermistor detects 50 C or lower for 5 seconds continuously the compressor stops After 3 minutes...

Page 75: ...r Replace Defective indoor control PCB Replace Defective return air temperature thermistor input circuit 2 Error detection method Anomalously low temperature or high temperature resistance is detected by indoor return air temperature thermistor Thi A 3 Condition of Error displayed When the temperature thermistor detects 50 C or lower for 5 seconds continuously the compressor stops After 3 minute d...

Page 76: ...hermistor see the error display E6 YES NO YES NO Error stop Reset Indoor heat exchanger temperature C 56 63 Wash Defective indoor heat exchanger temperature thermistor connector Correct Defective indoor heat exchanger temperature thermistor Check refrigerant system Adjust 2 Error detection method Indoor heat exchanger temperature thermistor ThI R1 R2 R3 3 Condition of Error displayed When it is de...

Page 77: ...Replace Defective indoor control PCB Replace Check optional equipment Correct setting to Humidifier DM interlock Defective indoor power PCB Replace Check wiring of drain motor Correct Check drain motor 2 Error detection method Float switch is activated 3 Condition of Error displayed If the float switch OPEN is detected for 3 seconds continuously or if float switch connector or wire is disconnected...

Page 78: ...ore than 17 indoor units connected to one remote controller NO YES Defective remote controller Replace Reduce to 16 or less units 2 Error detection method When it detects more than 17 of indoor units connected to one remote contorller 3 Condition of Error displayed Same as above 4 Presumable cause Excessive number of indoor units connected Defective remote controller Note Error code Remote control...

Page 79: ...place fan motor If the error persists after replacing the fan motor replace the indoor control PCB Malfunction by temporary noise 2 Error detection method Detected by rotation speed of indoor fan motor 3 Condition of Error displayed When actual rotation speed of indoor fan motor drops to lower than 200rpm for 30 seconds continuously the compressor and the indoor fan motor stop After 2 seconds it s...

Page 80: ...ndoor control PCB Defective SW7 Replace Turn SW7 1 on the indoor control PCB OFF and reset the power 2 Error detection method After indoor operation check when the communication between indoor and outdoor unit is established and SW7 1 is still kept ON 3 Condition of Error displayed Same as above 4 Presumable cause Mistake in SW7 1 setting Due to forgetting to turn OFF SW7 1 after indoor operation ...

Page 81: ...f this error occurs again within 60 minutes after the initial detection 4 Presumable cause Faulty connection of remote controller temperature thermistor Defective remote controller temperature thermistor Defective remote controller PCB Note After 10 seconds has passed since remote controller thermistor was switched from valid to invalid E28 will not be displayed even if the thermistor harness is d...

Page 82: ...aces adequate Isn t there any fouling or clogging on heater exchanger Control operation check Defective outdoor PCB Replace Excessive refrigerant amount Recharge refrigerant by weighing proper amount on a scale 2 Error detection method Anomalous stop Reset 53 63 Outdoor heat exchanger temperature C 3 Condition of Error displayed When anomalous outdoor heat exchanger temperature occurs 5 times with...

Page 83: ...ent refrigerant amount Recharge refrigerant by weighing proper amount on a scale Control operation check Defective outdoor PCB Replace Check unit side Isn t filter clogged Are adequate indoor outdoor unit installation spaces Isn t there any short circuit of air Isn t there any fouling clogging on indoor heat exchanger 2 Error detection method For the error detection method refer to the protective ...

Page 84: ...ure sensor Replace Defective outdoor PCB Replace Defective outdoor heat exchanger temperature sensor input circuit 2 Error detection method Detection of anomalously low temperature resistance on the outdoor heat exchanger temperature sensor 3 Condition of Error displayed When the temperature sensor detects 55 C or lower for 20 seconds continuously within 2 minutes to 2 minutes 20 seconds after the...

Page 85: ...efective outdoor PCB Replace Defective outdoor air temperature sensor input circuit 2 Error detection method Detection of anomalously low temperature resistance on outdoor air temperature sensor 3 Condition of Error displayed When the temperature sensor detects 55 C or lower for 5 seconds continuously within 2 minutes to 2 minutes 20 seconds after the compressor ON the compressor stops After 3 min...

Page 86: ... discharge pipe temperature sensor Replace Defective outdoor PCB Replace Defective temperature sensor input circuit 2 Error detection method Detection of anomalously low temperature resistance on the discharge pipe temperature sensor 3 Condition of Error displayed When the temperature sensor detects 25 C or lower for 5 seconds continuously within 10 minutes to 10 minutes 20 seconds after the compr...

Page 87: ...y Open the valves Check refrigerant amount and refregerant circuit In case of transitional increase of high pressure and or test run several times restarting may recover it because liquid refrigerant migrated in the compresser is discharged from the compressor Replace compressor 2 Error detection method In order to prevent from overcurrent of inverter if the current exceeds the specifications it m...

Page 88: ...es fully opened Is the filter clogged Is there any liquid flooding Is the superheat within normal range Is the low pressure sensor and suction pipe temperature thermistor normal Is there any anoumalous sound on the compressor YES From previous page YES Defective outdoor PCB Replace Defective outdoor PCB Replace 2 Error detection method In order to prevent from overcurrent of inverter if the curren...

Page 89: ...eign matter like dust fouling etc YES Is voltage within the specified range NO Restore normal condition Restore normal condition Remove foreign matter like dust fouling etc Defective outdoor PCB Replace 2 Error detection method Error is displayed if the converter voltage exceeds DC340V 3 times within 20 minutes Remote controller may be set after 3 minutes delay 3 Condition of Error displayed Same ...

Page 90: ... motor 3 Condition of Error displayed When actual rotation speed of outdoor fan motor drops to 75min 1 or lower for 30 minutes continuously the compressor and the outdoor fan motor stop After 3 minutes delay it starts again automatically but if this anomaly occurs 3 times within 60 minutes after the initial detection 4 Presumable cause Defective outdoor PCB Foreign material at rotational area of f...

Page 91: ... cause Note If the power transistor primary current exceeds the setting value for 3 seconds the compressor stops Power transistor primary current Faulty outdoor PCB Dust on control PCB Blown F2 fuse NO NO Check soldered surfaces on the outdoor control PCB for foreign matter like dust fouling etc Isn t F2 fuse 250V 20A blown Remove foreign matter like dust fouling etc Replace fuse Defective outdoor...

Page 92: ...r return air temperature thermistor input circuits 2 Error detection method Judge insufficient refrigerant amount by detecting the temperature differnce between indoor heat exchanger ThI R and indoor return air ThI A 3 Condition of Error displayed When the insufficient refrigerant amount is detected 3 times within 60 minutes 4 Presumable cause Defective indoor heat exchanger temperature thermistor...

Page 93: ...ces Faulty compressor Defective outdor air temp sensor Defective outdoor PCB Diagnosis Countermeasure 2 Error detection method 3 Condition of Error displayed 4 Presumable cause Note NO NO NO NO NO YES YES YES Is outdoor ventilation condition good Inspect outdor air temp sensor Is the refrigerant amount nomal Adjust the refrigerant amount properly Secure space for inlet and outlet Replace compresso...

Page 94: ...ange over to the rotor detection operation of compressor motor 3 Condition of Error displayed If compressor fails to startup for 42 times 4 Presumable cause Faulty outdoor fan motor Faulty outdoor PCB Anomalous power supply voltage Improper refrigerant amount and refrigerant circuit Faulty compressor Motor bearing Note Insulation resistance The unit is left for long period without power supply or ...

Page 95: ...hifting to the compressor rotor position detection operation the compressor stops 4 Presumable cause Defective outdoor fan motor Defective outdoor PCB Anomalous power supply voltage Improper refrigerant amount and refrigerant circuit Defective compressor motor bearing Note Insulation resistance The unit is left for long period without power supply or soon after installation migrated liquid refrige...

Page 96: ... and grind burrs with a file etc Install the lower case to the flat wall with attached two wooden screws Connect the remote controller cord to the terminal block Connect the terminal of remote controller X with the terminal of indoor unit X Y X and Y are no polarity Wiring route is as shown in the right diagram depending on the pulling out direction The wiring inside the remote controller case The...

Page 97: ... nipper or knife ooden screws Connect the remote controller cord to the terminal block Connect the terminal of remote controller X Y with the terminal of indoor unit X Y X and Y are no polarity Wiring route is as shown in the right diagram depending on the pulling out direction The wiring inside the remote controller case should be within 0 3mm2 recommended to 0 5mm2 The sheath should be peeled of...

Page 98: ...UNCTION SET 2 Press button once and change to the TEMP RANGE indication 3 Press SET button and enter the temperature range setting mode 4 Select UPPER LIMIT or LOWER LIMIT by using button 5 Press SET button to fix 6 When UPPER LIMIT is selected valid during heating Press SET button to fix Indication example UPPER 26 C Displayed for two seconds After the fixed upper limit value displayed for two se...

Page 99: ... indoor function 04 accordingly You can select the louver stop position in the four The louver can stop at any position In normal working indication indoor unit temperature is indicated instead of airflow Only the master remote controller can be indicated Heating preparation indication should not be indicated Temperature indication is by degree C Temperature indication is by degree F ON OFF button...

Page 100: ...ucing 1 5 C increase in return air temperature of indoor unit To be reset producing 1 0 C increase in return air temperature of indoor unit To be reset producing 1 0 C increase in return air temperature of indoor unit To be reset producing 1 5 C increase in return air temperature of indoor unit To be reset producing 2 0 C increase in return air temperature of indoor unit When heating thermostat is...

Page 101: ...enty minutes OFF or heating thermostat is OFF the fan perform intermittent operation for five minutes e minutes OFF g type indoor unit and is automatically defined le split series the indoor fan tap is raised hanger temperature to start frost prevention control How to check the current setting When you select from No and funcion and press set button by the previous operation the Setting displayed ...

Page 102: ...ner panel located on the refrigerant pipes side 4 Remove two screws and detach the lid from the control box of the air conditioner Setting on site 1 PCB on the receiver has the following switches to set the functions Default setting is shown with mark Customized signal setting to avoid mixed communication Receiver master slave setting Buzzer valid Invalid Auto restart Normal Remote Master Slave Va...

Page 103: ...n 2 An indication will be displayed for 3 5 seconds after transmitting a STOP command from the wireless remote controller or the operation of the backup button to stop the unit 3 An indication appearing in 1 or 2 above will go off as soon as the unit starts operation 4 When there are no error records to indicate addresses of all the connected units are displayed 5 When there are some error records...

Page 104: ... 103 12 SRK T 126 60 17 150 Exterior dimension ...

Page 105: ...ressed once again it stops operating Used to swing the louver Every time this button is pressed displays switch as below Sets room temperature by pressing or button Sets time when setting the time Used to cancel the TIMER SETTINGS Used to reset the microcomputer Indicates the selected airflow volume Indicates when ON TIMER is set Indicates the ON TIMER setting time Nothing displayed when ON TIMER ...

Page 106: ...tion Inspection lamp During operation Green failure Red Remote controller sensor ON OFF button Button to start stop the air conditioner FAN SPEED button Button to set the fan speed AIR CON No button Indicates the No of air conditioner which is connected MODE button Use to select the mode TEMP button Use to raise the setting temperature TEMP button Use to lower the setting temperature Operation mod...

Page 107: ...n site configuration 2 Maximum prolongation of remote controller wiring is 600m If the prolongation is over 100m change to the size below But the wiring in the remote controller case should be 0 3mm2 recommended to 0 5mm2 Change the wire size outside of the case according to wire connecting Waterproof treatment is necessary at the wire connecting section Be careful about contact failure Thin part ...

Page 108: ... The remote controller cord can be extracted from the upper center After the thin part in the upper side of the remote controller upper case is scraped with a nipper or knife remove burr with a file The lower case of the remote controller is mounted to a flat wall with two accessory wood screws Connect the remote controller cord to the terminal block Connect the terminals X and Y of the remote con...

Page 109: ...tting of the remote controller 5 Confirmation method for return air temperature Return air temperature can be confirmed by the remote controller operation Press AIR CON NO button for over 5 seconds 88 blinks on the temperature setting indicator 88 blinks for approximately 2 seconds while data is read Then the return air temperature is displayed Example return air temperature 27 C blinking Note For...

Page 110: ...f heating in the case of remote controller thermistor enabled offset temperature at 2 0 C 07 Remote controller thermistor 3 0 C At the time of heating in the case of remote controller thermistor enabled offset temperature at 3 0 C 05 Ventilation setting 01 No ventilator connection 02 Ventilator links air conditioner In case of Single split series by connecting ventilation device to CNT of the indo...

Page 111: ...n number blinking indication if the setting is sequentially conducted continue with the same procedures If the setting is finished proceed to Stop air conditioning and simultaneously press AIR CON NO and MODE buttons at the same time for over three seconds The function number 01 blinks in the upper right Press TEMP or TEMP button Select the function number Press MODE button Decide the function num...

Page 112: ...Refrigeration Systems 16 5 Konan 2 chome Minato ku Tokyo 108 8215 Japan http www mhi co jp Because of our policy of continuous improvement we reserve the right to make changes in all specifications without notice Copyright MITSUBISHI HEAVY INDUSTRIES LTD C ...