Page 2 - Important; ...In an area with High Winds
SM830082 Please Read Before Starting This air conditioning system meets strict safety and operatingstandards. As the installer or service person, it is an importantpart of your job to install or service the system so it operatessafely and efficiently. For safe installation and trouble-free operation...
Page 3 - ii
WHO SHOULD USE THIS MANUAL This service manual is made to assist the service technician apply his knowledge and trainingto this model air conditioner. This manual is written both for experienced service personsand those who are new to air conditioning service. To help those with less experience orwh...
Page 4 - iii
2-7 Overload Protection (Heating) .................................................................. II - 9 2-8 Discharge Temperature Control (Cooling and Heating) ........................... II - 10 2-9 Auto. Mode for Automatic Heating/Cooling Switching .............................. II - 11 2-10 D...
Page 6 - -1 Unit Specifications
I - 2 SM830082 1 2 3 4 5 1. Specifications 1-1 Unit Specifications MODEL No. Indoor Unit XH2442 Outdoor Unit CH2442 POWER SOURCE 230 - 208 V / 1 Phase / 60 Hz PERFORMANCE Cooling Heating Capacity* BTU / h 24,000 23,400 25,000 24,300 (17 ° F)** 16,400 15,800 Moisture removal (High) Pints / h 8.6 8.4 ...
Page 16 - DATA SUBJECT TO CHANGE WITHOUT NOTICE; -2 Major Component Specifications
I - 12 SM830082 1 2 3 4 5 1. Specifications MODEL No. XH2442 Source 230 - 208 VAC / 1 phase / 60 Hz Remote c o n t r o l l e r ( O p t i o n ) RCS - SH80UA, WL Controller P. C. B Ass'y CR - TH2442 Control circuit fuse 250 VAC, 3 A Fan (Number … diameter) in. (mm) Turbo (1…17-7/16 (443)) Fan motor Mo...
Page 29 - -3 Other Component Specifications
I - 25 SM830082 1 2 3 4 5 1. Specifications 1-3 Other Component Specifications (A) Indoor Unit MODEL No. XH2442 Power Transformer ATR – II224A Rated Primary 220 VAC, 60 Hz Secondary BRN - BRN : 14 V, 0.45 A, RED - RED : 14 V, 0.3 A Capacity — Coil resistance Ω WHT - WHT : 61.0 , RED - RED : 1.37 (Am...
Page 44 - Indoor unit : Ceiling Mounted Type
I - 40 SM830082 1 2 3 4 5 1. Specifications 1-4 Dimensional data Indoor unit : Ceiling Mounted Type 24 Type Drain connectionDrain connection for left sideRefrigerant liquid line (1/4") Flare connectionRefrigerant gas line (3/4") Flare connectionHole for rear side refrigerant tubingHole for t...
Page 46 - Indoor unit : Concealed Duct Type
I - 42 SM830082 1 2 3 4 5 1. Specifications 1-4 Dimensional data Indoor unit : Concealed Duct Type 24 Type Refrigerant liquid line ø3/8 (narrow tube)(Use the tube connector)Refrigerant gas line ø5/8 (wide tube)Upper drain port (O.D. 1-1/4)Bottom drain port (O.D. 1-1/32)Suspension lugPower supply inl...
Page 48 - Thickness more than T1/16 inch
I - 44 SM830082 1 2 3 4 5 1. Specifications 1-4 Dimensional data Indoor unit : Concealed Duct Type ■ Flange for the air intake duct (Field supply): For Concealed Duct Type 23/32 1-7/32 F G H G F 11/32 E D B (O.D.) A (Hole) C-ø1/8 (Hole) 1/4 (Hole) 12-1/32 10-1/4 (O.D.) 29/32 7-7/8 1-25/32 5/16 1-25/...
Page 49 - Indoor unit : Wall Mounted Type
I - 45 SM830082 1 2 3 4 5 1. Specifications 1-4 Dimensional data Indoor unit : Wall Mounted Type 24 Type 49-7/32 Dimension : inch Refrigerant gas line (wide tubing: ø 3/4)Refrigerant liquid line (narrow tubing: ø 1/4) Drain hose OD 1-1/4 1911_X_S 4-5/32 2-1/4 8-9/32 14-9/16 2-3/4
Page 53 - -5 Refrigerant Flow Diagram
I - 49 SM830082 1 2 3 4 5 1. Specifications 1-5 Refrigerant Flow Diagram Outdoor Unit: CH2442 Indoor Unit: 24 Type HP Highpressureswitch Compressor Accumulator Accumulator EC P Heat exchanger 4-way valve EC P Heat exchanger Distributor Electronicref.controlvalve Strainer Liquid linenipple Liquid lin...
Page 54 - Temperature
I - 50 SM830082 1 2 3 4 5 1. Specifications HP Highpressureswitch Compressor Accumulator EC P Heat exchanger 4-way valve EC P Heat exchanger Distributor Electronicref.controlvalve Strainer Liquid linenipple Liquid lineservicevalve O.D.3/8"(9.52mm) O.D.3/4"(19.05mm) Gas linenipple Gas lineser...
Page 94 - -10 Noise Criterion Curves
I - 90 SM830082 1 2 3 4 5 1. Specifications 1-10 Noise Criterion Curves ● 4-Way Air Discharge Semi-concealed Type MODEL : XH2442 SOUND LEVEL : HIGH 38 dB(A), NC 31 LOW 31 dB(A), NC 23 CONDITION : Center, Under the unit 4.9 ft. SOURCE : 208 - 230 V, 1 Phase, 60 Hz MODEL : XH4242 SOUND LEVEL : HIGH 45...
Page 98 - NOTE
I - 94 SM830082 1 2 3 4 5 1. Specifications 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 0597_C_S APPROXIMATETHRESHOLD OFHEARING FORCONTINUOUSNOISE NC-60 NC-50 NC-40 NC-30 NC-20 NC-70 OCTAVE BAND SOUND PRESSURE LEVEL, dB (0dB=0.0002 µ bar) BAND CENTER FREQUENCIES, Hz NC-70 NC-50 NC-...
Page 99 - -11 Increasing the Fan Speed; N O T E; How to read the diagram
I - 95 SM830082 1 2 3 4 5 1. Specifications 1-11 Increasing the Fan Speed If external static pressure is too great (due to long extension of ducts, for example), the air flow volume may drop too low at each air outlet. This problem may be solved by increasing the fan speed using the following proced...
Page 100 - -12 Air throw distance chart; : LOUVER ANGLE 20 ̊ in Cooling mode
I - 96 SM830082 1 2 3 4 5 1. Specifications 1-12 Air throw distance chart ● 4-Way Air Discharge Semi-concealed Type Model: 24 Type Model: 36, 42 Type : LOUVER ANGLE 20˚ in Cooling mode : LOUVER ANGLE 60˚ in Heating mode Condition Fan Speed : Hi Room air temp. : 80 ˚C DB in cooling mode 68 ˚C DB in h...
Page 104 - SELECTING THE INSTALLATION SITE; Indoor Unit; places where large amounts of oil mist exist.; N OT E
I - 100 SM830082 1 2 3 4 5 1. Specifications Ceiling-Mounted Type ■ SELECTING THE INSTALLATION SITE Indoor Unit AVOID: ● areas where leakage of flammable gas may beexpected. ● places where large amounts of oil mist exist. ● direct sunlight. ● locations near inverter lamps which may affectperformance...
Page 106 - Air Discharge Chamber for Top Discharge
I - 102 SM830082 1 2 3 4 5 1. Specifications Air discharge 0426_C_I Recommended outer dimensions of wind shield (field supply) 0936_C_I 3 - ø1-9/16" hole 6 - ø15/64" hole 9-27/32" 21-5/8" 15/16" 5-3/16" 22-7/16" 1/2" 23-15/32" 21-13/16" 5-5/32" 9-27/32"...
Page 109 - Wiring System Diagrams
I - 105 SM830082 1 2 3 4 5 1. Specifications ● Wiring System Diagrams (1) Basic wiring diagram for standard control 1 2 U1 U2 1 2 1 2 1 2 1 2 G G L1 L2 G Indoor Unit Inter-unitpower wiringSingle phase230/208V Inter-unitcontrol wiring(Low voltage) Remote controller Outdoor Unit Ground Ground (Option)...
Page 121 - Section; Processes and functions; PROCESSES AND FUNCTIONS
II - 1 SM830082 1 2 3 4 Section 5 2. Processes and functions 2. PROCESSES AND FUNCTIONS 2-1 Room Temperature Control ...................................................................... II - 2(A) Cooling .................................................................................................
Page 122 - Chart Summary and Explanations; Once the compressor starts, it keeps running for 5 minutes.; ON; Compressor; OFF; Room Temperature Control
II - 2 SM830082 1 2 3 4 Section 5 2. Processes and functions Fig. 1 Chart Summary and Explanations ❑ Once the compressor starts, it keeps running for 5 minutes. ❑ Once the compressor stops, it will not start running again for 3 minutes. ❑ If you change the operation mode (HEAT, COOL, or FAN) during ...
Page 123 - Thermo ON: When room temperature is –2°F below the set temperature T ̊.
II - 3 SM830082 1 2 3 4 Section 5 2. Processes and functions (B) Heating Chart Summary and Explanations ❑ Once the compressor starts, it keeps running for 5 minutes. ❑ Once the compressor stops, it will not start running again for 3 minutes. ❑ If you change the operation mode (HEAT, COOL or FAN) dur...
Page 125 - Chart Explanations and notes; Chart Explanations and notes
II - 5 SM830082 1 2 3 4 Section 5 2. Processes and functions Fig. 4 2-3 Automatic Fan Speed (Indoor Unit) (A) Cooling By pressing the FAN SPEED button on the remote controller, the fan speed can be set atone of four steps: AUTO., HI., MED., or LO. When set at AUTO. the indoor unit fan speedwill be a...
Page 126 - Outdoor Fan Speed Control; Cooling; Outdoor unit coil; 2°F or more, less than 77°F; Outdoor coil; less than 57°F; Heating
II - 6 SM830082 1 2 3 4 Section 5 2. Processes and functions 2-4 Outdoor Fan Speed Control To optimize the performance of air conditioner, the outdoor fan speed is selectedautomatically according to the outdoor temperature. ❑ Note that in both Cooling and Heating modes, the fan comes on at first at ...
Page 129 - This function prevents the air conditioner from overloading.
II - 9 SM830082 1 2 3 4 Section 5 2. Processes and functions Fig. 10 2-7 Overload Protection (Heating) This function prevents the air conditioner from overloading. Chart Explanations and notes ❑ This chart shows how the outdoor fan speed and the electronic refrigerant control valvereact to coil temp...
Page 130 - Discharge Temperature Control (Cooling and Heating); Chart Summary and Explanations; Discharge temperature is sensed by TH8 (discharge gas sensor).
II - 10 SM830082 1 2 3 4 Section 5 2. Processes and functions 2-8 Discharge Temperature Control (Cooling and Heating) This function prevents the compressor motor from burnout by overheating. OUTDOOR FAN SPEED DISCHARGE GAS TEMP. ( ° F) 239 (24, 36 Type) 221 203 200 194 185 275 (42 Type) 257 239 235 ...
Page 131 - Auto. Mode for Automatic Heating/Cooling Switching; COOLING
II - 11 SM830082 1 2 3 4 Section 5 2. Processes and functions 2-9 Auto. Mode for Automatic Heating/Cooling Switching ❑ When the AUTO mode is selected, the microprocessor calculates the differencebetween the set temperature and the room temperature, and automatically switchesto the COOLING or HEATING...
Page 132 - Chart summary and Explanations
II - 12 SM830082 1 2 3 4 Section 5 2. Processes and functions Chart summary and Explanations ❑ This chart shows how the Operation Mode (COOLING or HEATING) is determined by themicroprocessor taking the room temperature into consideration. It also shows thetemperature points at which the cooling or h...
Page 135 - Automatic Restart after Power Interruption; This air conditionner has a power failure recovery function.
II - 15 SM830082 1 2 3 4 Section 5 2. Processes and functions (B) AUTO Control Mode When the Compressor has stopped while in AUTO mode, the 4-way valve switches on(heating) or off (cooling) within 1 minute according to the following conditions: Fig. 16 2-12 Automatic Restart after Power Interruption...
Page 136 - Electronic Refrigerant Control Valve; Model; HEAT
II - 16 SM830082 1 2 3 4 Section 5 2. Processes and functions 2-13 Electronic Refrigerant Control Valve ❑ This valve allows very precise and smooth control of the amount of refrigerant flow in thesystem. Since the valve is operated by a step motor, the control circuits can open orclose it in very ex...
Page 137 - Compressor Current Detection Circuit; Outdoor Model; Overload Protection
II - 17 SM830082 1 2 3 4 Section 5 2. Processes and functions 2-15 Compressor Current Detection Circuit ❑ The Compressor Current Detection Circuit detects the compressor current and,depending on the current range, can stop the compressor motor so it will not bedamaged by overcurrent. ❑ Overcurrent c...
Page 138 - Electronic Refrigerant Control Valve Control; Contents and Order of control
II - 18 SM830082 1 2 3 4 Section 5 2. Processes and functions 2-16 Electronic Refrigerant Control Valve Control The circulation volume of the refrigerant is controlled by a pulse type electronic control valve.When the power is switched ON, the opening degree of the electronic control valve iscontrol...
Page 139 - Voltage Detection Control
II - 19 SM830082 1 2 3 4 Section 5 2. Processes and functions 2-17 Voltage Detection Control When the power voltage falls below 160 V or rises above 260 V, operation lamp and stand-bylamp flash alternately to protect the compressor and electrical components.
Page 141 - • Electric Wiring Diagram; MOV; Indoor Units
3 SM830082 III - 2 3. Electrical data TH1 TH2 TH3 3 1 2 1 2 1 2 1 TH4 3 1 2 1 DP 2P (GRN) 3P (WHT) 4 5 3 2 1 4 3 2 1 2 1 13 2 1 3 1 3 1 3 1 3 1 3 1 4 3 5 6 2 14 3 5 6 5 13 9 7 3 12 S P 1 Power Line Control Line To Outdoor Unit Terminal Plate (5P) Earth Terminal • Electric Wiring Diagram W 854-2-5268...
Page 142 - • Schematic Diagram; Symbols
3 III - 3 SM830082 3. Electrical data • Schematic Diagram S 854-2-5268-930-00-1 (X) FMI 2 1 3 1 2 1 2 1 2 1 2 1 3 1 3 1 3 1 2 34 5 1 5P-U2 5P-U1 To Outdoor Unit Indoor Coil Indoor Coil Indoor Coil Room Thermistor TH4 TH3E3 TH2E2 TH1 LSW FS CR E1 2 3 1 5 6 4 3 1 1 1 1 8 9 3 3 RC1 1X 3X 1 2 3 LM 2 1 3...
Page 151 - Outdoor Units
3 SM830082 III - 12 3. Electrical data • Electric Wiring Diagram TH6 TH7 TH8 2 1 2 1 2 1 3 1 63PH 3 1 3 1 3579 1 3 1 1 3 BLK BLK BLK BLK WHT WHT TR AC230V AC14V FMO PNK BRN GRY GRY WHT RED WHT VLT YEL CT B A UV W 3 2 RS T 3 1 2 1 2 1 4 3 4 3 6 5 6 5 8 7 8 P Connector 8P (WHT) RC2 S7 U1 U2 To Indoor ...
Page 157 - Service procedures; SERVICE PROCEDURES
1 2 3 4 Section IV - 1 SM830082 4. Service procedures 4. SERVICE PROCEDURES 4-1 Troubleshooting ...................................................................................... IV - 2 (1) Check before and after Troubleshooting ......................................... IV - 3 (2) General Troubl...
Page 158 - Troubleshooting; This section explains:; symptom like “poor cooling” or “outside fan doesn’t come; What the LED codes mean
4. Service procedures 1 2 3 4 Section SM830082 IV - 2 4-1 Troubleshooting This section explains: This unit is made to be trouble free, and not need much service. However, with time, movingparts wear out, electronic components break down, and sometimes misuse damages the unit.The purpose of this sect...
Page 159 - . Check power supply wiring; Check power supply; Check that power is being supplied.; . Check the lead wires and connectors in indoor and outdoor units.; Check that the sheath of lead wires is not damaged.
1 2 3 4 Section IV - 3 SM830082 4. Service procedures (1) Check before and after Troubleshooting Many problems may happen because of wiring or power supply problems, so you shouldcheck these areas first. Problems here can cause false results in some of the other tests, andso should be corrected firs...
Page 160 - General Troubleshooting Flow Chart: Diagnosis and Remedy
4. Service procedures 1 2 3 4 Section SM830082 IV - 4 (2) General Troubleshooting Flow Chart: Diagnosis and Remedy When you have found a major problem, such as refrigerant not flowing in the system orreduced air circulation, come to this section and find the box listing the problem. Connectedto the ...
Page 162 - Meanings of alarm messages; Possible Cause of Malfunction; RCU
4. Service procedures 1 2 3 4 Section SM830082 IV - 6 (3) Meanings of alarm messages When using group control, main indoor unit address setting is duplicated. (For single heat pump type.) Error in Auto. address setting. (No. or capacity of judged indoor unit is small.) Error in Auto. address setting...
Page 163 - : Refrigerant Circuit
1 2 3 4 Section IV - 7 SM830082 4. Service procedures Thermistorfailure Fault withcomp. and itscircuit Possible Cause of Malfunction Indoor thermistor is either openor damaged. Outdoor thermistor is eitheropen or damaged. Protective device for comp. isactivated. EEPROM (ICB of PCB) failure Model set...
Page 164 - * REFRIGERANT SHORTAGE; CAUTION
4. Service procedures 1 2 3 4 Section SM830082 IV - 8 (4) LED Indication on the Outdoor Unit’s P.C.B. Ass’y If something goes wrong with the outdoor unit, LED lamps on the outdoor P.C.B. Ass’y lightup to show the cause of the trouble, in addition to the Alarm message on the remotecontroller. LED 2 o...
Page 166 - Symptom: LCD on the remote controller displays “CHECK E01”. (Unusual
4. Service procedures 1 2 3 4 Section SM830082 IV - 10 2) Symptom: LCD on the remote controller displays “CHECK E01”. (Unusual communication between remote controller and indoor unit.) OK No No Yes Yes NG 2096_THS_I Start Remote controller judges itself with self-diagnostic functions Replace the rem...
Page 167 - communication between the indoor and outdoor units.)
1 2 3 4 Section IV - 11 SM830082 4. Service procedures 4) Symptom: LCD on the remote controller is displaying “CHECK E04”. (Unusual communication between the indoor and outdoor units.) 5) Symptom: LCD on the remote controller is displaying “CHECK E05”. (Unusual communication between the indoor and o...
Page 168 - communication between the indoor and outdoor units)
4. Service procedures 1 2 3 4 Section SM830082 IV - 12 6) Symptom: LCD on the remote controller is displaying “CHECK E06”. (Unusual communication between the indoor and outdoor units) 7) Symptom: LCD on the remote controller is displaying “CHECK E08”. (Duplicate indoor unit address setting) 8) Sympt...
Page 169 - thermostat operation warning)
1 2 3 4 Section IV - 13 SM830082 4. Service procedures 9) Symptom: LCD on the remote controller displays “CHECK P01”. (Indoor fan protection thermostat operation warning) No No Yes Yes Yes 2098_THS_I Start Is there 230-208 V AC between T20-1 and T20-3 on the indoor unit PCB? Is the indoor fan wire w...
Page 171 - 1) Symptoms: LCD on the remote controller displays “CHECK P03”.
1 2 3 4 Section IV - 15 SM830082 4. Service procedures 11) Symptoms: LCD on the remote controller displays “CHECK P03”. (Alarm for unusual discharge temp. of compressor) 12) Symptom: LCD on the remote controller displays “CHECK P04”. (High-pressure switch activation warning) 0343_M_I Start Unusual d...
Page 172 - detection operation warning)
4. Service procedures 1 2 3 4 Section SM830082 IV - 16 13) Symptom: LCD on the remote controller displays “CHECK P05”. (Negative phase detection operation warning) 14) Symptom: LCD on the remote controller displays “CHECK E15”. Yes No No No Yes Yes 0345_M_I Start Check the power breaker etc. and rep...
Page 173 - 5) Symptom: LCD on the remote controller displays “CHECK E16”.
1 2 3 4 Section IV - 17 SM830082 4. Service procedures 15) Symptom: LCD on the remote controller displays “CHECK E16”. No No No Yes Yes 0647_M_S Start Repair the wiring. When the group of the units are installed, is there any mis-cross between inter unit control wiring and refrigerant tubing? Confir...
Page 175 - Indoor fan does not operate.; Yes
1 2 3 4 Section IV - 19 SM830082 4. Service procedures (6) Procedures When a Specific Component Does Not Work 1) Indoor fan does not operate. No Yes Is fan motor capacitornormal ? Is there voltage outputof P.C.B. Ass'y for fanmotor ? • Check resistance of fan motor winding. Replace the fan motor. Re...
Page 176 - Compressor motor does not operate.
4. Service procedures 1 2 3 4 Section SM830082 IV - 20 4) Compressor motor does not operate. 5) Outdoor fan does not operate. No Yes Does compressor motor magnetic contactor (52C) actuate ? Replace the compressor motor magnetic contactor. Check resistance of compressor motor winding. Replace the com...
Page 178 - (B) Check the sensor temperature readings
4. Service procedures SM830082 IV - 22 1 2 3 4 Section 5 Fig. IV-4 1929_M_I Sensor address Sensor temperature ° F a Unit No. (Indoor unit address) (B) Check the sensor temperature readings The air conditioner has thermo sensors which are used to control the unit. ❏ Each sensor has an address which i...
Page 179 - (C) Accessing the service problem history
SM830082 IV - 23 SM830082 1 2 3 4 Section 5 4. Service procedures Refer to the table below for the relationship between the sensor address and the location of the sensor. In case there are no sensor equipped with the unit, “- - -” is shown on the display. C Resetting the remote controller display to...
Page 180 - (D) Check the remote controller itself for correct operation
4. Service procedures SM830082 IV - 24 1 2 3 4 Section 5 (D) Check the remote controller itself for correct operation The remote controller has a self-diagnostic function to check for problems in the remotecontroller itself.In order to check, the shorting plug (2P) inserted in the socket (4P) on the...
Page 181 - Execute the auto. address operation
SM830082 IV - 25 SM830082 1 2 3 4 Section 5 4. Service procedures Never press (clear) button unless you want to erase the accessed data in memory. Follow the procedure below only when erasing is necessary. ❏ To erase accessed data, press the button. ❏ When erasing is finished,“----” mark appears on ...
Page 182 - ) buttons at the same time for more than 4 seconds.
4. Service procedures SM830082 IV - 26 1 2 3 4 Section 5 (F) Confirm and change the indoor unit address (Ref. Fig. IV-8, IV-9) ❏ The purpose of the above function is to let you confirm the indoor unit address afterthe auto. address operation, and change the indoor unit address if it is needed. a Pre...
Page 185 - Press the; k a
SM830082 IV - 29 SM830082 1 2 3 4 Section 5 4. Service procedures ( I ) Change the period of the filter timer (Ref. Fig. IV-13) ❏ If the period of filter timer is not suitable (for example in case of dirty environment), theperiod can be shortened to half as follows: a Press the + buttons at same tim...
Page 186 - Resistance; Power Supply Wires; Checking the Electrical Components
4. Service procedures 1 2 3 4 Section SM830082 IV - 30 Fig. IV-14 Coppertube ormetallic part Clip Insulationtester Probe Terminal plate 0639_X_S Fig. IV-15 Coppertube ormetallic part Clip Insulationtester Probe 0640_X_S Fig. IV-16 From fan motor,compressor and otherparts. Clip Probe Insulationtester...
Page 187 - Disconnect the connector which leads to the indoor fan motor (FMI).
1 2 3 4 Section SM830082 IV - 31 SM830082 4. Service procedures (2) Checking the Protective Devices • Disconnect the connector, which consists of P (plug) and S (socket) when you want tocheck the protective device. • Then check continuity among plug’s (and/or socket’s) terminal as in Fig. IV-18. • N...
Page 188 - Checking the Electrical Parts
4. Service procedures 1 2 3 4 Section SM830082 IV - 32 (3) Checking the Electrical Parts 1 Power transformer (TR1) ..................... Indoor unit *Measure the coil resistance. • Primary 230-208V ; Measure the resistance between No.1 and No.3 (WHT lead wires) terminals of 3P (WHT) socket connected...
Page 189 - Check for continuity using a multimeter; Method Used to Replace Fuse on PCB Ass’y; Remove the PCB Ass’y from the electrical compo-
1 2 3 4 Section SM830082 IV - 33 SM830082 4. Service procedures Fan motorcapacitor Compressor motorcapacitor 1041_X_S Multimeter Ω Fig. IV-19 6 6 6 6 6 Continuity of fuse on P.C.B. Ass’y • Check for continuity using a multimeter as shown in Fig. IV-20. Method Used to Replace Fuse on PCB Ass’y 1. Rem...
Page 190 - Solenoid coil of the electronic refrigerant; Refer to “1-2 Major component specifications”.; Compressor motor magnetic contactor (52C) ............ Outdoor unit; Refer to “1-3 Other component specifications”.
4. Service procedures 1 2 3 4 Section SM830082 IV - 34 7 Solenoid coil of the electronic refrigerant *Measure the coil resistance. control valve (ERCV) ………… Indoor unit • Measure the resistance between No. 5 (GRY lead wire) and other terminals (another color oflead wires) of 5P (WHT) plug connected ...
Page 191 - coil sensor; Thermistor Characteristic Curv
1 2 3 4 Section SM830082 IV - 35 SM830082 4. Service procedures (2) Indoor heat exch. coil sensor : TH2(E1), TH3(E2) Outdoor heatexch. coil sensor : TH6(C1), TH7(C2) ( PBC-41E) (4) Thermistor Characteristic Curv (1) Room temp. sensor : TH1 (KTEC-35) –4 5 14 23 32 41 50 59 68 0 5 10 15 20 25 30 35 40...
Page 192 - Setting of indoor control PCB
4. Service procedures 1 2 3 4 Section SM830082 IV - 36 (5) PCB Setting ● Setting of outdoor control PCB (A) Standard control (single outdoor unit) In case of single outdoor unit installation, even if in case of twin, triple or quartet type (2, 3 or 4 indoor units), no setting necessary. Keep factory...
Page 193 - 0 auto address
1 2 3 4 Section SM830082 IV - 37 SM830082 4. Service procedures (6) R.C. Address Setting Method (“0” when shipped from factory) 1 ON ON side OFF side 2 0 R.C. address R.C. address R.C. address (S3 2P dip switch, green or blue) (S2 Rotary switch, Black) 00 auto address Both OFF Set to 0 1 ON 10 posit...
Page 194 - bination Numbers; ) buttons at the same
4. Service procedures 1 2 3 4 Section SM830082 IV - 38 (7) Automatic Address Setting Method (8) Displaying Indoor / Outdoor Unit Com- bination Numbers Display the indoor / outdoor unit address after auto- matic address setting. (1) When installing multiple units, match the indoor unit address number...
Page 196 - Preparing for Test Run; Test run procedure
4. Service procedures 1 2 3 4 Section SM830082 IV - 40 (10) Test Run ■ Preparing for Test Run ● Before attempting to start the air conditioner,check the following: (1) All loose matter is removed from the cabinetespecially steel filings, bits of wire, and clips. (2) The control wiring is correctly c...
Page 197 - Test Run Procedure; One of CN006 of all linked outdoor units shold be short.
1 2 3 4 Section SM830082 IV - 41 SM830082 4. Service procedures Set the outdoor unit R.C. address.Turn on power supply switch. Execute auto. address operation with the remote controller. Press A. ADD (S1) button (See P87). or Execute auto. address operation with the remote controller. Press A. ADD (...
Page 200 - (12) Checking procedure for each PC Board
4. Service procedures 1 2 3 4 Section SM830082 IV - 44 (12) Checking procedure for each PC Board The indoor and outdoor PCBs have functions to check the signal transmission and reception of theserial circuit and to check the microcomputer operation. (Self-diagnosis function) ● Precautions required w...
Page 201 - Shorting CK.L or CK.H pin of the outdoor PCB
1 2 3 4 Section SM830082 IV - 45 SM830082 4. Service procedures (13) TMX60 pins When shorting TMX60 pins on the indoor and outdoor PCBs, operations shown on the above table will be per- formed on each indoor and outdoor unit. Use TMX60 pins to perform a quick check. • When checking pin operation, st...
