Page 1: Table Of Contents
REVISED EDITION-A <Outdoor unit> • The installation manual has been added in REVISED EDITION-A. Model name OCH800 is void. MXZ-SM72TAM-U1 MXZ-SM96TAM-U1 MXZ-SM120TAM-U1 1. SERVICE REF. ··································· 2 2. SAFETY PRECAUTION ······················· 3 3. OVERVIEW OF UNITS ························ 7 4. SPECIFICATIONS ···························· 12 5.
Page 2: Service Ref
SERVICE REF. MXZ-SM72TAM-U1 MXZ-SM96TAM-U1 MXZ-SM120TAM-U1 OCH800A_2...
Page 3: Safety Precaution
SAFETY PRECAUTION 2-1. Always observe for safety Before obtaining access to terminal, all supply circuit must be disconnected. Preparation before the repair service • Prepare the proper tools. • Prepare the proper protectors. • Provide adequate ventilation. • After stopping the operation of the air conditioner, turn off the power-supply breaker. •...
Page 4 Use the following tools specifically designed for use with R410A refrigerant. • The following tools are necessary to use R410A refrigerant. Tools for R410A Gauge manifold Flare tool Charge hose Size adjustment gauge Gas leak detector Vacuum pump adaptor Torque wrench Electronic refrigerant charging scale Handle tools with care.
Page 5 2-2-3. Service tools Use the below service tools as exclusive tools for R410A refrigerant. Tool name Specifications Gauge manifold Only for R410A Use the existing fitting specifications. (UNF1/2) Use high-tension side pressure of 768.7 psig (5.3 MPa·G) or over. Charge hose Only for R410A Use pressure performance of 738.2 psig (5.09 MPa·G) or over.
Page 6 Dimension B ( ) (in [mm]) -0.4 Nominal dimensions (in) Outside diameter (mm) R410A 6.35 43/64 [17.0] 43/64 [17.0] 9.52 7/8 [22.0] 7/8 [22.0] 12.70 1-3/64 [26.0] 15/16 [24.0] 15.88 1-9/64 [29.0] 1-1/16 [27.0] 19.05 – 1-27/64 [36.0] ■ Tools for R410A (The following table shows whether conventional tools can be used or not.) Tools and materials R410A tools Can R22 tools be used ?
Page 7: Overview Of Units
OVERVIEW OF UNITS 3-1. Auxiliary heating on/off control set-up ■ Auxiliary heating operation controls another heat source that depends on the main system's oper- ations, which means the interlock operation shown in 2 below will be possible. 1. Indoor unit must be R410A UL model for this function to operate. 2.
Page 8 Stage 1 Amb. decreasing - Outdoor unit HP operation Amb. increasing - Defrost : Heater contact ON signal - Other than defrost : Contact OFF Stage 2 - Outdoor unit HP operation - Heater contact ON signal Stage 3 - Outdoor unit OFF (Standby) - Heater contact ON signal TH7 = Outdoor temperature −25°C...
Page 9 3-2. System construction Outdoor unit 8HP (6 ton) 10HP (8 ton) 12HP (10 ton) SM72TAM SM96TAM SM120TAM Applicable indoor unit Capacity class 04 to 72 04 to 96 Number of units 1 to 23 1 to 30 Total system capacity range 50 to 130% of outdoor unit capacity Model name CMY-Y62-G-E, CMY-Y62GA-E...
Page 10 3-3. System construction (Branch box system) Outdoor unit Horsepower 8 HP (6 ton) 10 HP (8 ton) 12 HP (10 ton) Model name SM72TAM SM96TAM SM120TAM Nominal capacity Cooling (kBtu/h) Heating Refrigerant R410A Applicable indoor unit Capacity class 06 to 36 Number of units to 12 (6) 2 to 12 (8)
Page 11 3-4. System Specifications 3-4-1. Outdoor Unit Outdoor unit Model name SM72TAM SM96TAM SM120TAM Cooling (kBtu/h) Nominal capacity Heating (kBtu/h) Compressor (kW) Cooling/Heating capacity indicates the maximum value at operation under the following condition. Cooling Indoor: D.B. 80°F/W.B. 67°F (D.B. 26.7°C/W.B. 19.4°C) Outdoor: D.B.
Page 12: Specifications
SPECIFICATIONS Outdoor model MXZ-SM72TAM-U1 MXZ-SM96TAM-U1 MXZ-SM120TAM-U1 Indoor Model Non-Ducted Ducted Non-Ducted Ducted Non-Ducted Ducted Cooling capacity (Nominal) 21.1 28.1 35.2 Btu/h 72,000 96,000 120,000 Power input 5.67 8.16 10.7 Current input 16.6-15.0 23.9-21.6 31.3-28.3 (Rated) 20.2 33.4 Btu/h 69,000 92,000...
Page 13: Data
DATA 5-1. Selection of indoor and outdoor units ■ How to determine the capacity when less than or equal 100% indoor model size units are connect- ed in total: The purpose of this flow chart is to select the indoor and outdoor units. For other purposes, this flow chart is intended only for reference.
Page 14 ■ How to determine the capacity when greater than 100% indoor model size units are connected in total The purpose of this flow chart is to select the indoor and outdoor units. For other purposes, this flow chart is intended only for reference.
Page 15 5-1-1. Cooling Design condition Outdoor dry bulb temperature 98.6ºF (37.0ºC) Total cooling load 60.6 kBtu/h Room 1 Indoor dry bulb temperature 80.6ºF (27.0ºC) Indoor wet bulb temperature 64.4ºF (20.0ºC) Cooling load 27.2 kBtu/h Room 2 Indoor dry bulb temperature 75.2ºF (24.0ºC) Indoor wet bulb temperature 64.4ºF (19.0ºC) Cooling load...
Page 16 = 34.2 kBtu/h The capacity is enough for the cooling load of Room 2 (33.4 kBtu/h): A proper indoor unit is selected. Note: • Go on to the selection of units for heating after the selection for cooling has successfully completed. If failed, try again until proper units are selected.
Page 17 • Comparison with essential load Against the essential load 67.5 kBtu/h, the maximum system capacity is 68.35 kBtu/h: Proper indoor units have been selected. • Calculation for the maximum indoor unit capacity of each room When CTx = CTo, use the calculation formula below. Room1: CTx ×...
Page 18 5-2. Correction by temperature The outdoor units have varied capacity at different designing temperature. With the nominal cooling/heating capacity value and the ratio below, the capacity can be observed at various temperature. 5-2-1. Cooling 60.8 62.6 64.4 66.2 69.8 71.6 73.4 75.2 [°FW.B.]...
Page 19 5-2-2. Heating [°F D.B.] 60.8 62.6 64.4 66.2 69.8 71.6 73.4 75.2 78.8 80.6 [°C D.B.] Indoor temperature <Figure 3> Indoor unit temperature correction 70.0°F (21.1°C) D.B. [°F W.B.] [°C W.B.] Outdoor Temperature 70.0°F (21.1°C) D.B. 61.0°F (16.0°C) D.B. 79.0°F (26.0°C) D.B. [°F W.B.] [°C W.B.] Outdoor Temperature...
Page 20 5-3. Standard operation data (Reference data) Operation MXZ-SM72TAM-U1 MXZ-SM96TAM-U1 MXZ-SM120TAM-U1 Operating Ambient Indoor DB/WB 80°F/67°F 70°F/60°F 80°F/67°F 70°F/60°F 80°F/67°F 70°F/60°F conditions temperature (26.7°C/19.4°C) (21.1°C/15.6°C) (26.7°C/19.4°C) (21.1°C/15.6°C) (26.7°C/19.4°C) (21.1°C/15.6°C) Outdoor 95°F/75°F 47°F / 43°F 95°F/ 75°F 47°F/43°F 95°F/75°F 47°F/43°F (35.0°C/23.9°C) (8.3°C/6.1°C) (35.0°C/23.9°C)
Page 21 5-4. Standard capacity diagram Before calculating the sum of total capacity of indoor units, please convert the value into the Btu/h model capacity follow- ing the formula on "5-1. Selection of indoor and outdoor units". MXZ-SM72TAM-U1 ■ Cooling G(x) Total capacity of indoor units (kBtu/h)
Page 22 ■ Heating G(x) Total capacity of indoor units (kBtu/h) Total capacity of indoor units (kBtu/h) 208, 230 V Total capacity of indoor units (kBtu/h) OCH800A_22...
Page 23 MXZ-SM96TAM-U1 ■ Cooling G(x) 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120 126 132 Total capacity of indoor units (kBtu/h) 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120 126 132 Total capacity of indoor units (kBtu/h) 208, 230 V 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120 126 132...
Page 24 ■ Heating G(x) 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120 126 132 Total capacity of indoor units (kBtu/h) 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120 126 132 Total capacity of indoor units (kBtu/h) 208, 230 V 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120 126 132...
Page 25 MXZ-SM120TAM-U1 ■ Cooling G(x) 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120 126 132 138 144 150 156 162 Total capacity of indoor units (kBtu/h) 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120 126 132 138 144 150 156 162 Total capacity of indoor units (kBtu/h) 208, 230 V 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120 126 132 138 144 150 156 162...
Page 26 ■ Heating G(x) 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120 126 132 138 144 150 156 162 Total capacity of indoor units (kBtu/h) 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120 126 132 138 144 150 156 162 Total capacity of indoor units (kBtu/h) 208, 230 V 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120 126 132 138 144 150 156 162...
Page 27 Figure 8 to 10. Then multiply by the heating capacity from Figure 3 and 4 in "5-2. Correction by temperature" to obtain the actual capacity. ■ Capacity Correction Curve 5-5-1. Cooling MXZ-SM72TAM-U1 Total capacity of indoor unit [kBtu/h] 1.00 0.95 0.90...
Page 28 1.00 0.95 0.90 0.85 0.80 0.75 0.70 Piping equivalent length (ft) <Figure 7> Correction of refrigerant piping length 5-5-2. Heating MXZ-SM72TAM-U1 1.00 0.95 0.90 0.85 0.80 0.75 0.70 Piping equivalent length (ft) <Figure 8> Correction of refrigerant piping length OCH800A_28...
Page 29 MXZ-SM96TAM-U1 1.00 0.95 0.90 0.85 0.80 0.75 0.70 Piping equivalent length (ft) <Figure 9> Correction of refrigerant piping length MXZ-SM120TAM-U1 1.00 0.95 0.90 0.85 0.80 0.75 0.70 Piping equivalent length (ft) <Figure 10> Correction of refrigerant piping length ■ Method for obtaining the piping equivalent length Piping equivalent length = piping length to the farthest indoor unit + 0.3 ×...
Page 30 5-6. Noise criterion curves MXZ-SM72TAM-U1 MXZ-SM96TAM-U1 SPL(dB) SPL(dB) MODE LINE MODE LINE COOLING COOLING HEATING HEATING NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 APPROXIMATE APPROXIMATE THRESHOLD OF THRESHOLD OF HEARING FOR HEARING FOR NC-20 NC-20 CONTINUOUS CONTINUOUS...
Page 31: Outlines And Dimensions
OUTLINES AND DIMENSIONS Unit: mm <inch> OCH800A_31...
Page 32: Wiring Diagram
WIRING DIAGRAM OCH800A_32...
Page 33: Troubleshooting
TROUBLESHOOTING 8-1. Checkpoints for test run 8-1-1. Procedures before test run 1. Before a test run, make sure that the following work is completed. • Installation related: Make sure that the panel of cassette type is installed and electrical wiring is done. Otherwise electrical functions like auto vane will not operate normally.
Page 34 Error Error Detected Unit code code Trouble Remarks Remote Indoor Outdoor (2 digits) (4 digits) Controller 5101 Air inlet thermistor (TH21) open/short О Compressor temperature thermistor (TH4) open/short О Check delay code 1202 5102 Liquid pipe temperature thermistor (TH22) open/short О...
Page 35 0403 (Ed): Serial communication error / Model selection SW error Abnormal points and detection methods Causes and checkpoints Serial communication between the outdoor multi controller • Wire breakage or contact failure of connector CN2 or circuit board and outdoor power circuit board is defective. •...
Page 36 1102 (U2): Compressor temperature trouble Chart 1 of 2 Abnormal points and detection methods Causes and checkpoints • TH4 falls into either of the following temperature condi- • Malfunction of stop valve tions: • Over-heated compressor operation caused by shortage - over 230°F (110°C) continuously for 5 minutes of refrigerant - over 257°F (125°C)
Page 37 1102 (U2): Compressor temperature trouble Chart 2 of 2 Diagnosis of failure Continued from the previous page. Disconnect the thermistor wiring to check the resistance. Is the resistance detected? Replace the thermistor. Check the voltage(*) and appearance of the outdoor multi controller circuit board. Is the voltage normal value? Replace the outdoor multi controller circuit Is it free from any trace of overheating...
Page 38 1302 (UE): High pressure trouble Chart 1 of 4 Abnormal points and detection methods Causes and checkpoints • High pressure abnormality (63H operation) • Faulty operation of stop valve (not fully open) 63H operates(*) during compressor operation. • Clogged or broken pipe (* 602 psig [4.15 MPaG]) •...
Page 39 1302 (UE): High pressure trouble Chart 2 of 4 Diagnosis of failure Continued from the previous page. (Clogged filter) Is the indoor unit filter clogged? Clean the filter. (Not clogged) (Dirty) Is there dirt on the indoor heat Wash the indoor heat exchanger. exchanger? (Not dirty) (Short-cycled)
Page 40 1302 (UE): High pressure trouble Chart 3 of 4 Diagnosis of failure Continued from the previous page. Is the resistance detected? Replace the TH7. Disconnect the indoor LEV wiring to check the resistance. Is the resistance detected? Replace the indoor LEV. Check the voltage(*) and appearance of the indoor controller board.
Page 41 1302 (UE): High pressure trouble Chart 4 of 4 Diagnosis of failure Continued from the previous page. Is the resistance detected? Replace the SV1. Is the connector for outdoor multi controller circuit board 63H discon- Reconnect the connector or connect it tightly. nected or loose? Check the 63HS voltage.
Page 42 1500 (U7): Superheat due to low discharge temperature trouble Chart 1 of 2 Abnormal points and detection methods Causes and checkpoints 10 or more minutes after the compressor starts operation, • Disconnection or loose connection of TH4 if a discharge superheat of -27°F (-15°C)* or less is detect- •...
Page 43 1500 (U7): Superheat due to low discharge temperature trouble Chart 2 of 2 Diagnosis of failure Continued from the previous page. Is the resistance detected? Replace the indoor LEV. Check the voltage and appearance of the indoor controller board. Is the voltage normal? Is it free from any trace of overheating Replace the indoor controller board.
Page 44 1501 (U2): Refrigerant shortage trouble Chart 1 of 2 Abnormal points and detection methods Causes and checkpoints • All of the following conditions have been satisfied for 15 • Defective operation of stop valve (not fully open) consecutive minutes: • Defective thermistor - The compressor is operating in HEAT mode.
Page 45 1501 (U2): Refrigerant shortage trouble Chart 2 of 2 Diagnosis of failure Continued from the previous page. Is the resistance detected? Replace the thermistor. Check the 63HS voltage. Is the voltage(*) detected? Replace the 63HS. Check the voltage and appearance of the outdoor multi controller circuit board.
Page 46 1501 (U2): Closed valve in cooling mode Abnormal points and detection methods Causes and checkpoints Stop valve is closed during cooling operation. • Outdoor liquid/gas valve is closed. Both of the following temperature conditions have been • Malfunction of outdoor LEV (LEV1) (blockage) satisfied for 20 minutes or more during cooling operation.
Page 47 1503 (P6): Freeze protection of plate heat exchanger / Freeze pro- tection of branch box or indoor unit Abnormal points and detection methods Causes and checkpoints The purpose of the error code is to prevent indoor unit • Wrong piping connection between indoor unit and from freezing or condensation which is caused when a branch box refrigerant keeps flowing into the indoor unit that is not...
Page 48 1508 (EF): 4-way valve trouble in heating mode Abnormal points and detection methods Causes and checkpoints 4-way valve does not operate during heating operation. • 4-way valve failure Any of the following temperature conditions is satisfied • Disconnection or failure of 4-way valve coil for 3 minutes or more during heating operation when the •...
Page 49 3121: Out-of-range outside air temperature Abnormal points and detection methods Causes and checkpoints • When the thermistor temperature of -24°F (-31.1°C) or • Outdoor air temperature below has continuously been detected for 3 minutes • Thermistor failure during heating operation (during compressor operation), •...
Page 50 4100 (UF): Compressor current interruption (Locked compressor) Chart 1 of 2 Abnormal points and detection methods Causes and checkpoints Overcurrent of DC bus or compressor is detected within 30 • Closed stop valve seconds after the compressor starts the operation. •...
Page 51 4100 (UF): Compressor current interruption (Locked compressor) Chart 2 of 2 Diagnosis of failure Continued from the previous page. Connect the compressor wiring (U, V and W Are they connected properly? phase) properly, then turn the power back ON. Check whether the compressor is faultily grounded or not.
Page 52 4210 (UP): Compressor overcurrent interruption/Failure in 12 VDC power supply circuit on power circuit board Chart 1 of 2 Abnormal points and detection methods Causes and checkpoints • Overcurrent of DC bus or compressor is detected 30 or • Closed outdoor stop valve more seconds after the compressor starts the opera- •...
Page 53 4210 (UP): Compressor overcurrent interruption/Failure in 12 VDC power supply circuit on power circuit board Chart 2 of 2 Diagnosis of failure Continued from the previous page. Connect the compressor wiring (U, V and W Are they connected properly? phase) properly, then turn the power back ON. Check the operation of indoor/outdoor fan motors.
Page 54 4220 (U9): Voltage shortage/Overvoltage/PAM error/L1 open phase/ Primary current sensor error/Power synchronization sig- nal error Chart 1 of 2 Abnormal points and detection methods Causes and checkpoints Any of the following symptoms are detected; • Decrease/increase of power supply voltage •...
Page 55 4220 (U9): Voltage shortage/Overvoltage/PAM error/L1 open phase/ Primary current sensor error/Power synchronization sig- nal error Chart 2 of 2 The black square (■) indicates a switch position. Diagnosis of failure Continued from the previous page. 7, 8 Check the power supply voltage on the terminal block of the outdoor unit.
Page 56 4230 (U5): Heat sink temperature trouble Abnormal points and detection methods Causes and checkpoints TH8 detects a temperature outside the specified range • Blocked outdoor fan during compressor operation. • Malfunction of outdoor fan motor • Blocked airflow path TH8: Thermistor <Heat sink> •...
Page 57 4250 (U6): Power module trouble Abnormal points and detection methods Causes and checkpoints Both of the following conditions have been satisfied: • Short-circuit caused by looseness or disconnection of • Overcurrent of DC bus or compressor is detected during compressor wiring compressor operation.
Page 58 4400 (U8): Fan trouble (Outdoor unit) Abnormal points and detection methods Causes and checkpoints No rotational frequency is detected, a value outside the • Malfunction of fan motor specified range is detected during fan motor operation. • Disconnection of CNF connector •...
Page 59 5101 (U3): Compressor temperature thermistor (TH4) open/short <Detected in outdoor unit> Abnormal points and detection methods Causes and checkpoints TH4 is found to be open/short. • Disconnection or contact failure of connectors (The open/short detection is disabled for 10 minutes after •...
Page 60 5102 (U4): Suction pipe temperature thermistor (TH6) open/short <Detected in outdoor unit> Abnormal points and detection methods Causes and checkpoints TH6 is found to be open/short. • Disconnection or contact failure of connectors (The open/short detection is disabled for 10 seconds to 10 •...
Page 61 5105 (U4): Outdoor liquid pipe temperature thermistor (TH3) open/ short Abnormal points and detection methods Causes and checkpoints TH3 is found to be open/short. • Disconnection or contact failure of connectors (The open/short detection is disabled for 10 seconds to 10 •...
Page 62 5106 (U4): Ambient temperature thermistor (TH7) open/short Abnormal points and detection methods Causes and checkpoints TH7 is found to be open/short • Disconnection or contact failure of connectors • Faulty thermistor Open: • Defective outdoor multi controller circuit board −40°F (−40°C) or less Short: 194°F (90°C) or more TH7:...
Page 63 5109 (U4): HIC pipe temperature thermistor (TH2) open/short Abnormal points and detection methods Causes and checkpoints TH2 is found to be open/short. • Disconnection or contact failure of connectors • Faulty thermistor Open: • Defective outdoor multi controller circuit board −40°F (−40°C) or less Short: 194°F (90°C) or more...
Page 64 5110 (U4): Heat sink temperature thermistor (TH8) open/short Abnormal points and detection methods Causes and checkpoints TH8 (Internal thermistor) is found to be open/short. • Disconnection or contact failure of connectors • Faulty thermistor • Y model • Defective outdoor multi controller circuit board Open: −30.6°F (−34.8°C) or less Short:...
Page 65 5201 (F5): High pressure sensor (63HS) trouble Abnormal points and detection methods Causes and checkpoints • The detected pressure in the high pressure sensor is 14 • Defective high pressure sensor psig (1kgf/cm ) or less during operation, the compressor •...
Page 66 5202 (F3): Low pressure sensor (63LS) trouble Abnormal points and detection methods Causes and checkpoints • The detected pressure in the low pressure sensor is -33 • Defective low pressure sensor psig (−2.3 kgf/cm ) or less, or 329 psig (23.1 kgf/cm ) or •...
Page 67 5300 (UH): Current sensor trouble Abnormal points and detection methods Causes and checkpoints The detected current sensor input value (primary current) • Decrease/Trouble of power supply voltage during compressor operation is outside the specified • Disconnection of compressor wiring range. •...
Page 68 6600 (A0): Duplex address error Abnormal points and detection methods Causes and checkpoints 2 or more units with the same address exist. • There are 2 units or more with the same address in their controller among outdoor unit, indoor unit, Fresh Master, Lossnay or remote controller.
Page 69 6602 (A2): Transmission processor hardware error Abnormal points and detection methods Causes and checkpoints The transmission line shows “1” although the transmission • A transmitting data collision occurred because of a processor transmitted “0”. wiring work or polarity change has performed while the power is ON on either of the indoor/outdoor unit, Fresh Master or Lossnay.
Page 70 6603 (A3): Transmission bus BUSY error Abnormal points and detection methods Causes and checkpoints • Transmission fails due to collision and it continues for 8 • The transmission processor is unable to transmit due to 10 minutes. to a short-cycle voltage such as noise is mixed on the •...
Page 71 6606 (A6): Signal communication error with transmission proces- Abnormal points and detection methods Causes and checkpoints • The data of unit/transmission processor were not nor- • Accidental disturbance such as noise or lightning surge mally transmitted. • Hardware malfunction of transmission processor •...
Page 72 6607 (A7): No ACK error Chart 1 of 4 Abnormal points and detection methods Causes and checkpoints ■ Common to all An abnormality detected by the sending side controller • The previous address unit does not exist since the ad- when receiving no ACK from the receiving side, though dress switch was changed while power was on.
Page 73 6607 (A7): No ACK error Chart 2 of 4 Abnormal points and detection methods Causes and checkpoints ■ The address/attribute of Fresh Master was displayed: An abnormality detected by the indoor unit if it received no • While the indoor unit is operating with the remote con- ACK when transmitting signal to the Fresh Master.
Page 74 6607 (A7): No ACK error Chart 3 of 4 Diagnosis of failure Note: • When the address of the outdoor unit is displayed as abnormal, the outdoor circuit board may be faulty. If the unit is not restored after conducting the following procedure, check the outdoor circuit board. Procedure 1: Turn the power OFF of indoor/outdoor unit, Fresh Master, Lossnay and remote controller...
Page 75 6607 (A7): No ACK error Chart 4 of 4 Diagnosis of failure Continued from the previous page. Apply the correct transmission line, then perform Is the correct transmission line used? the procedure 1. When operating in a single refrigerant system Is it operating different refrigerant (single indoor unit), the controller of the dis- systems?
Page 76 6608 (A8): No response frame error Abnormal points and detection methods Causes and checkpoints Although the sending side controller received ACK that • Continuous failure of transmission due to noise, etc. notifies the reception of signal, no response command is •...
Page 77 6831 (E0)/6834 (E4): MA communication receive error Chart 1 of 2 Abnormal points and detection methods Causes and checkpoints Detected in remote controller or indoor unit: • Contact failure of remote controller wiring • The main or sub remote controller cannot receive signal •...
Page 78 6831 (E0)/6834 (E4): MA communication receive error Chart 2 of 2 Diagnosis of failure Continued from the previous page. Refer to the chapter "Electrical Work". Is the wiring connected Connect the wiring properly as specified in the properly and meeting the chapter "Electrical Work"...
Page 79 6832 (E3)/6833 (E5): MA communication send error Chart 1 of 2 Abnormal points and detection methods Causes and checkpoints Detected in remote controller or indoor unit. • There are 2 remote controllers set as main. • Malfunction of remote controller sending/receiving cir- cuit •...
Page 80 6832 (E3)/6833 (E5): MA communication send error Chart 2 of 2 Diagnosis of failure Continued from the previous page. Refer to the chapter "Electrical Work". Connect the wiring properly as specified in the Is the wiring connected properly chapter "Electrical Work" in the indoor unit and meeting the conditions? Installation Manual.
Page 81 7100 (EF): Total capacity error Abnormal points and detection methods Causes and checkpoints The sum of the model class of the connected indoor units • The total of number on connected indoor unit model exceeds the specified value (130% of the outdoor unit names exceeds the specified capacity level.
Page 82 7101 (EF): Capacity code error Abnormal points and detection methods Causes and checkpoints • A connected indoor unit is incompatible, error code The model name of connected indoor unit (capacity code) is read as incompatible. 7101 is displayed. Diagnosis of failure Check the model selection switch (SW4 on the indoor controller board) of the connected indoor unit.
Page 83 7102 (EF): Connecting excessive number of units and branch box- Abnormal points and detection methods Causes and checkpoints The number of the connected indoor units exceeds the Connecting more indoor units and branch boxes than the limit, error code 7102 is displayed. limit.
Page 84 7105 (EF): Address setting error Chart 1 of 2 Abnormal points and detection methods Causes and checkpoints The address setting is wrong. There is a unit without correct address setting in the range specified in the installation manual. Diagnosis of failure <Outdoor unit>...
Page 85 7105 (EF): Address setting error Chart 2 of 2 Diagnosis of failure <M-NET RC (main)> Check whether the M-NET RC (main) address is set in 000, or in the range of 101 to 150. Set the address properly, then turn the power OFF of indoor/outdoor unit, Fresh Master, Lossnay and remote controller simultaneously Is the address setting correct?
Page 86 7130 (EF): Incompatible unit combination error Abnormal points and detection methods Causes and checkpoints The connected indoor unit is not compatible with the out- Connecting indoor unit(s) which is not authorized to con- door unit, the outdoor unit detects the error at startup. nect to the outdoor unit.
Page 87 8-2. Remote controller diagnosis Refer to “Remote controller check” for MA remote controller system. 8-3. Remote controller trouble 8-3-1. M-NET remote controller systems Symptom or inspection code Cause Though the content of operation is displayed on the re- • The power supply of the indoor unit is not on. mote controller, some indoor units do not operate.
Page 88 8-3-2. For MA remote controller systems Symptom or inspection code Cause Though the content of operation is displayed on the re- • The power supply of the indoor unit is not on. mote controller, some indoor units do not operate. •...
Page 89 8-4. The following symptoms do not represent product failure Symptom Cause Even the cooling (heating) operation selection button is The indoor unit cannot cool (heat) if other indoor units are pressed, the indoor unit cannot be operated. heating (cooling). Display: "Cooling (Heating)" blinks The auto vane runs freely.
Page 90 Function Operation in each switch setting Purpose Additional information When to set Select operating With Without Before turning Turn ON when the centralized • SW2-1 must be turned ON if a centralized control- system startup centralized centralized the power ON controller is connected to the ler is connected to the system.
Page 91 Function Operation in each switch setting Purpose Additional information When to set While the outdoor unit Activated Deactivated Any time To additionally increase by about 50 to 70 A refrigerant flow noise might be generat- is in HEAT operation, pulses of the LEV opening for units other ed in units other than the one in opera- additionally increase by than in HEAT operation.
Page 92 Function Operation in each switch setting Purpose Additional information When to set High heating perfor- Activated Deactivated Any time To raise the performance of HEAT The performance may not be raised mance mode operation if it is insufficient. depending on the capacity of indoor units in operation, or outside air temperature.
Page 93 A: Remote control panel B: Relay circuit C: External input adapter (PAC-SC36NA-E) CN3D D: Outdoor unit control board E: Relay power supply F: Procure locally G: Max. 10 m [32 ft] SW1: Switch SW2: Switch X, Y: Relay (contact rating: ≥ 0.1 A. 15 VDC, min. applicable load: ≤ 1 mA) The silent mode and the demand control are selected by switching the DIP switch 9-2 on outdoor controller board.
Page 94 ■ Linear expansion valve (LEV-A) Gray Orange Yellow Black Connector pins Normal Abnormal Gray - Black 46 ± 3 Ω Open or short Gray - Red Gray - Yellow Gray - Orange ■ Linear expansion valve (LEV-B) Blue Orange Yellow White Connector pins Normal...
Page 95 8-7-2. Check method of DC fan motor (fan motor/outdoor multi controller circuit board) ■ Precaution • High voltage is applied to the connector (CNF1, 2) for the fan motor. Pay attention to the service. • Do not pull out the connector (CNF1, 2) for the motor with the power supply on. (It causes trouble of the outdoor multi controller circuit board and fan motor.) ■...
Page 96 8-7-3. Check method of multi controller circuit board Multi controller circuit board check Fuse check Check the fuse on multi controller circuit board Disconnect the FAN motor Replace the outdoor multi connector and measure the Did the fuse blow? Is the fan motor normal? controller circuit board (MULTI.B.).
Page 97 8-7-4. Check method of power circuit board Note: To check the voltage of the parts on this board with a Power circuit board check multimeter is difficult due to its location. Test points are limited. Is the voltage of main incoming power •...
Page 98 8-7-5. Check method of M-NET power circuit board M-NET power circuit board check Note: To check the voltage of the parts on this board with a multimeter is difficult due to its location. Test points are limited. Check the voltage between M1 and M2 on the transmission terminal block TB3.
Page 99 8-8. How to check the components 8-8-1. Thermistor feature chart ■ Low temperature thermistors • TH2 (HIC pipe) • TH3 (Outdoor liquid pipe) • TH6 (Suction pipe) • TH7 (Ambient) Thermistor R0 = 15 kΩ ± 3 % B constant = 3480 ± 1 % =15exp{3480( –...
Page 100 8-8-2. High pressure sensor ■ The methods of comparing the high pressure sensor measurement and gauge pressure By configuring the digital display setting switch (SW1) as shown in the figure below, the pressure as measured by the high pressure sensor appears on the LED1,2 on the control board. 2 3 4 5 6 7 8 The black square (■) indicates a switch position.
Page 101 8-8-3. Low pressure sensor ■ The methods of comparing the low pressure sensor measurement and gauge pressure By configuring the digital display setting switch (SW1) as shown in the figure below, the pressure as measured by the low pressure sensor appears on the LED1 on the control board. 2 3 4 5 6 7 8 The black square (■) indicates a switch position.
Page 102 8-9. Test point diagram ■ Outdoor multi controller circuit board Caution: • TEST POINT 1 is high voltage. Model selection Model selection/ Pump down CN51 Function selection External signal Test run Function selection Model selection CN102 output Function selection Connect to the M-NET P.B (CN2) (M-NET power circuit SWP2 board)
Page 103 ■ Outdoor power circuit board Brief check of the power module If they are short-circuited, it means that they are broken. Measure the resistance in the following points (connectors, etc.). 1. Check of the diode module (DB1 or DB2) [L1]–[P1], [L2]–[P1], [L3]–[P1], [L1]–[N1], [L2]–[N1], [L3]–[N1] 2.
Page 104 ■ M-NET power circuit board Connect to the outdoor multi controller board (CN102) – : 24–30 VDC – : 24–30 VDC Connect to the outdoor noise filter circuit board (CNAC1) – : 208/230 VAC OCH800A_104...
Page 105 ■ Outdoor noise filter circuit board LI1, LI2, LI3 POWER SUPPLY Voltage of 208/230V AC is input (Connect to the terminal block (TB1)) EI, E3, E4 Connect to the electrical parts box CNAC1 208/230V AC Connect to the M-NET power circuit board (CN1) CNAC2 208/230V AC...
Page 106 8-10. Outdoor unit information display SW: setting 0: OFF 1: ON Contents LED1, 2 setting No. 12345678 00000000 Relay output (at Compressor 21S4 Always — normal state) operation lighting Error code (at 0000–9999 (Alternating display of addresses and error code) abnormal state) Note: When abnormality occurs, check display.
Page 107 Contents LED1, 2 setting No. 12345678 01110000 Abnormality code Alternating display of addresses 0000–9999 and abnormality code (including abnormality delay code) history 1 (the Followings are the delay code and the details of the abnormal delay latest) 1202: Discharge/Comp. temperature, Thermistor <Compressor> (TH4) 11110000 Abnormality code history 2 1205: Thermistor <Outdoor liquid pipe>...
Page 108 Contents LED1, 2 setting No. 12345678 11110100 State of LEV Cooling/ Cooling: Cooling/ Cooling/ Heating: Heating: Cooling: control Heating: SHd de- Heating: Heating: LEV opening LEV opening Correction of Td over heat crease Min.Sj Min.Sj correction correction high com- — prevention prevention correction...
Page 109 Contents LED1, 2 setting No. 12345678 01100010 TH4(Compressor) −99.9–999.9 (°F) (Td) data Note: Display of detected data of outdoor unit sensors and thermistors 11100010 TH6(Suction pipe) (ET) data 00010010 TH7 (Ambient) data 10010010 TH3 (Outdoor liquid pipe) data 01010010 TH8 (Heat sink) data 11010010 TH23 (Gas) data −99.9–999.9 (°F)
Page 110 Contents LED1, 2 setting No. 12345678 01000110 Check sum mode 0000–FFFF Note: Display of check sum code of ROM 11000110 Backup heating −99.9–999.9(°F) determination value a Note: Disclosure is required only for the US 100 00100110 Backup heating determination value b 101 00100110 Backup heating determination value c...
Page 111: Disassembly Procedure
DISASSEMBLY PROCEDURE : Indicates the visible parts in the photos/figures. : Indicates the invisible parts in the photos/figures. Note: • Turn OFF the power supply before disassembly. Removing the panels on the right side of the unit 1. Remove service panel fixing screws (5 × 12) and slide the hook on the right downward to remove the service panel. 2.
Page 112 Removing the electrical parts box 1. Remove the service panel. (See Photo 1) 2. Remove the top panel. (See Photo 1) 3. Disconnect the connecting wire from the terminal block. 4. Remove all the following connectors from the outdoor multi controller circuit board; <Diagram symbol in the connector housing>...
Page 113 Photo 6 Photo 7 Clamps Electrical parts box Thermistor <Suction pipe> (TH6) Thermistor <HIC pipe> (TH2) Thermistor <Compressor> (TH4) Ball valve fixing screws Compressor (MC) Thermal protector (TRS) Stop valve fixing screws Photo 8 Lead wire of thermistor <Ambient> (TH7) Sensor holder Removing the thermistor <Compressor>...
Page 114 2. Remove 4-way valve coil fixing screws (M5 × 7). 3. Remove the 4-way valve coil by sliding the coil toward you. 4. Loosen the clamp or band for the lead wire of the electrical parts box and the separator. 5.
Page 115 Photo 11 Linear expansion Linear expansion valve valve coil (LEV-B) Linear expansion valve Linear expansion valve coil (LEV-A) Low pressure sensor (63LS) Bypass valve coil fixing screw Bypass valve High pressure coil (SV1) switch (63H) Bypass valve High pressure sensor (63HS) 10.
Page 116 Photo 12 Electrical parts box Bottom plate of electrical parts box Reactor Screws 13. Removing the compressor (MC) 1. Remove the service panel. (See Photo 1) 2. Remove the top panel. (See Photo 1) 3. Remove the cover panel front. (See Photo 1) 4.
Page 117 Photo 14 Photo 15 Outlet Accumulator Accumulator leg Fusible plug Inlet Accumulator leg fixing screws Accumulator 15. Changing the fusible plug See the following descriptions. • Be careful not to expose the fusible plug to the braze torch flame or transfer heat to it. The temperature of the fusible plug must not become 140°F (60°C) or more while working.
Page 118: System Construction
10 SYSTEM CONSTRUCTION 10-1. Example of refrigerant piping and transmission cable wiring OCH800A_118...
Page 119 10-2. Special function operation and settings for M-NET remote control- Refer to “Special function operation and settings” for setting details. 10-3. Refrigerant system diagram Refrigerant flow in cooling Refrigerant flow in heating Thermistor (TH7) Check valve <Outdoor temperature> Service port <High pressure>...
Page 120: Electrical Wiring
11 ELECTRICAL WIRING Refer to installation manual “Electrical work” for details. OCH800A_120...
Page 121: Refrigerant Piping Tasks
12 REFRIGERANT PIPING TASKS 12-1. Refrigerant piping system Refer to installation manual “Pipe length and height difference” for refrigerant piping system. 12-2. PRECAUTIONS AGAINST REFRIGERANT LEAKAGE 12-2-1. Introduction R410A refrigerant of this air conditioner is non-toxic and non-flammable but leaking of large amount from an indoor unit into the room where the unit is installed may be deleterious.
Page 122 Total refrigerant in the refrigerating unit (lbs [kg]) ≤ Maximum concentration (lbs/ft [kg/m The smallest room in which an indoor *Maximum concentration of R410A: 0.027lbs/ft [0.44kg/m unit has been installed (ft 3-1. If the calculation results do not exceed the maximum concentration, perform the same calculation for larger rooms until it has been determined that nowhere exceeds the maximum concentration.
Page 123: Remote Controller
13 REMOTE CONTROLLER 13-1. Remote controller functions 13-1-1. PAR-41MAA Controller interface Main display Main menu Main Main menu Room Energy saving Cool Set temp. Auto Mode Temp. Menu screen Function guide RETURN SELECT Operation MENU Vane·Louver·Vent. (Lossnay) HOLD High power Comfort Main menu: RETURN Cursor...
Page 124 ■ Full mode ■ Basic mode All icons are displayed for explanation. Auto Cool Set temp. Room Set temp. Auto Cool Mode Temp. Mode Temp. Note: • Most settings (except ON/OFF, mode, fan speed, temperature) can be made from the main menu. 1.
Page 125 Vane · Louver · Vent. (Lossnay) Operation High power Manual vane angle Comfort 3D i-See sensor ON/OFF timer Timer Auto-OFF timer Timer menu Weekly timer OU silent mode Temp. range Restriction Operation locked Energy saving Auto return Energy saving Schedule Main/Sub Clock Basic setting...
Page 126 Main menu Setting and display items Setting details Operation Vane · Louver · Vent. Use to set the vane angle. (Lossnay) • Select a desired vane setting. Use to turn ON/OFF the louver. • Select a desired setting from ˝ON˝ and ˝OFF.˝ Use to set the amount of ventilation.
Page 127 Main menu Setting and display items Setting details Service Test run Select ˝Test run˝ from the Service menu to bring up the Test run menu. • Test run • Drain pump test run Input maintenance info. Select ˝Input maintenance Info.˝ from the Service menu to bring up the Maintenance information screen.
Page 128 13-1-2. PAR-FL32MA Controller interface Transmission area Transmission indicator Remote controller display Timer indicator *For explanation purposes, all of the items that appear in the display are shown. *All items are displayed when the Reset button is pressed. Operation areas ON/OFF button Temperature setting buttons Timer Off button Fan Speed button (Changes fan speed)
Page 129 Transmission area Remote controller display Set Temperature buttons OFF/ON button Mode button (Changes operation mode) Fan Speed button (Changes fan speed) Airflow button (Changes up/down airflow direction) i-see button Timer ON button Menu button Timer OFF button SET/SEND button Weekly timer ON/OFF button CANCEL button Up/Down button Set Time button (Sets the time)
Page 130 Error information Error information Error code Contact information Error unit Unit#1 Dealer Time Occurred 2/ 1 4:48 Model name Serial No. Reset error: Reset button Reset error: Reset button Page Reset Page Reset blinks SELECT MENU RETURN HOLD 2. Reset the error •...
Page 131 Main Main menu Service menu Enter maintenance password Service Select: SELECT Cursor SELECT MENU RETURN HOLD 3. Enter the current maintenance password (4 numerical digits). Move the cursor to the digit you want to change with the F1 or the F2 button and set each number (0 through 9) with the F3 or the F4 button.
Page 132 Heating mode: Check the heat blows out. 2. Check the operation of the outdoor unit’s fan. 3. Press the [SELECT] button and open the vane setting screen. Test run Remain Pipe °F Cool Auto Switch disp. SELECT Mode SELECT MENU RETURN HOLD ■...
Page 133 TEST RUN TEMP ON/OFF AUTO STOP MODE AUTO START VANE 3, 4 CHECK LOUVER TEST RUN RESET CLOCK 13-4-3. PAR-SL101A-E Operating instructions 1. Stop the air conditioner • Press the button to stop the air conditioner. • If the weekly timer is enabled ( is shown on the display), press the button to disable it ( is off).
Page 134 Operating instructions 1. Open the function setting screen. • Select ˝Service˝ from the main menu, and press the [SELECT] button. • Select ˝Setting˝ from the service menu, and press the [SELECT] button. • Select ˝Function setting˝ and press the [SELECT] button. Function setting screen will appear.
Page 135 5. Complete the function settings • When the settings are completed, press the [SELECT] button to send the setting data from the remote controller to the indoor units. When the transmission is successfully completed, the screen will return to the function setting screen. Function setting Ref.
Page 136 2. Enter the unit number. • Press the TEMP button to enter the unit number. • Direct the wireless remote controller toward the receiver of the indoor unit and press the button. By setting the unit number with the button, the specified indoor unit starts performing fan operation. Detect which unit is assigned to which number using this function.
Page 137 3. Select a mode • Press the button to set the mode number B. • Direct the wireless remote controller toward the receiver of the indoor unit and press the button. Current setting number: 1=1 beep (1 second) 2=2 beeps (1 second each) 3=3 beeps (1 second each) 4.
Page 138 Error history menu Error history Diagnosis Service menu: MENU Cursor SELECT MENU RETURN HOLD 3. 16 error history records will appear. 4 records are shown per page, and the top record on the first page indicates the latest error record. Error history Error Unt# dd/mm/yy...
Page 139 Self check Ref. address Ref. address Ref. address Error Unt # Error Unt# Grp. Return: RETURN Return: RETURN Select: SELECT Reset <Error history is shown.> <When there is no error history.> 3. Reset the error history. • Press the F4 button (reset) on the screen that shows the error history. A confirmation screen will appear to ask you if you want to delete the error history.
Page 140 If the weekly timer is enabled ( is shown on the display), press the button to disable it ( is off). 2. Press the button for 5 seconds. appears and the unit starts the self-check mode. CHECK 3. Press the button to select the refrigerant address (M-NET address) of the indoor unit for which you want to per- form the self-check.
Page 141 Remote controller check Start checking? Begin: SELECT SELECT MENU RETURN HOLD 3. Check the result of the remote controller check. See the following descriptions for each result: • The remote controller has no problem. Check other parts to find problems. E3, 6832: •...
Page 142 <Stable mode> setting: Cool/Heat/Normal • Press the [SELECT] button, Fixed operation will start. Note: • Stable mode will take approx. 20 minutes. Smooth maintenance Smooth maintenance Ref.address Ref.address Stable mode Stable mode Cool / Heat/ Normal Cool / Heat/ Normal Stabilization→Collecting Begin: SELECT Exit: ON/OFF...
Page 143 Check menu Error history Diagnosis Smooth maintenance Request code Service menu: MENU Cursor SELECT MENU RETURN HOLD 2. Set the refrigerant address and the request code. • Select the item to be changed with the F1 or F2 button. • Select the required setting with the F3 or F4 button. <Ref.address>...
Page 144 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN © Copyright 2022 MITSUBISHI ELECTRIC CORPORATION Issued: Jan. 2023 No. OCH800A Published: Oct. 2022 No. OCH800 Made in Japan Specifications are subject to change without notice.
Page 145 Air-Conditioners OUTDOOR UNIT MXZ-SM72/96/120TAM utilized R410A 9700058 INSTALLATION MANUAL FOR INSTALLER English English English For safe and correct use, please read this Installation Manual thoroughly before installing the air-conditioner unit. MANUEL D’INSTALLATION POUR L’INSTALLATEUR Français Français Français Veuillez lire le manuel d’installation en entier avant d’installer ce climatiseur pour éviter tout accident et vous assurer d’une utilisation correcte.
Page 146 Contents 1. Safety precautions ..........1 5.
Page 147: Safety Precautions
1. Safety precautions 1.1. Before installation Caution: • Do not use the unit in an unusual environment. If the air conditioner is • Follow the instructions below to prevent abrasive components contained in installed in areas exposed to steam, volatile oil (including machine oil), or sandpaper and cutting tools from entering the refrigerant circuit because sulfuric gas, areas exposed to high salt content such as the seaside, or areas those components can cause failures of the compressor and valves.
Page 148 1. Safety precautions 1.5. Using R410A refrigerant air conditioners Caution: • Do not use refrigerant other than R410A refrigerant. If another refrigerant is • Use C1220 copper phosphorus, for copper and copper alloy seamless pipes, to connect the refrigerant pipes. Make sure the insides of the pipes used, the chlorine will cause the oil to deteriorate.
Page 149: Installation Location
2. Installation location 2.1. Refrigerant pipe Refer to 4.2. Pipe length and height difference. 2.2. Choosing the outdoor unit installation location • Avoid locations exposed to direct sunlight or other sources of heat. • Select a location from which noise emitted by the unit will not inconvenience neighbors.
Page 150 2. Installation location 2.5. Constraints on indoor unit installation You should note that indoor units that can be connected to this outdoor unit are the following constraints. • Indoor units with model numbers 04-96 can be connected. • When using Branch box, Indoor units with model numbers 06-36 can be connected. •...
Page 151 2. Installation location 2.6. Ventilation and service space Note: The dimensions given along the arrows above are required to guarantee the air conditioner’s performance. Install the unit in as wide a place as possible for later service or repairs. 2.6.1. Windy location installation When installing the outdoor unit on a rooftop or other location unprotected from the wind, situate the air outlet of the unit so that it is not directly exposed to strong winds.
Page 152 2. Installation location in (mm) Fig. 2-6 Fig. 2-7 Fig. 2-8 Fig. 2-9 Fig. 2-10 Fig. 2-11 Fig. 2-12 Fig. 2-13 Fig. 2-14 Fig. 2-15 Fig. 2-16 Fig. 2-17 Fig. 2-18 2.6.2. When installing a single outdoor unit 2.6.3. When installing multiple outdoor units Minimum dimensions are as follows, except for Max., meaning Maximum dimen- Leave 1"...
Page 153: Installing The Outdoor Unit
3. Installing the outdoor unit in (mm) • Be sure to install the unit in a sturdy, level surface to prevent rattling noises during operation. (Fig. 3-1) <Foundation specifications> Foundation bolt M10 (3/8") Thickness of concrete 120 mm (4-23/32") Length of bolt 70 mm (2-3/4") Weight-bearing capacity 320 kg (705 lbs)
Page 154 4. Installing the refrigerant piping 4.2. Pipe length and height difference mm [in] Model Liquid pipe Gas pipe 4.2.1. Connection without Branch Box (Fig. 4-1) MXZ-SM72 ø22.2 [7/8] ø9.52 [3/8]* A+B+C+D+a+b+c+d+e ≤ 310 m [1016 ft] L ≤ 90 m [295 ft] ø9.52 [3/8]* MXZ-SM96 ø22.2 [7/8] L = A+B+C+D+e ≤ 130 m [426 ft] L > 90 m [295 ft]...
Page 155 4. Installing the refrigerant piping 4.2.2. Connection with Branch box (Fig. 4-2) A Outdoor unit D The first joint B Branch box E The second joint C Indoor unit a11 a12 Fig. 4-2 c1 + c2 + b1 + b2 + b3 + a1 + a2 + a3 + a4 + a5 + a6 + a7 + a8 + a9 + a10 + a11 + a12 Total piping length ≤...
Page 156 4. Installing the refrigerant piping I In the case of using 1-branch box Selecting pipe size (Fig. 4-3) mm [in] Flare connection employed. (No. brazing) Model Liquid pipe Gas pipe Branch box MXZ-SM72 ø9.52 [3/8] ø22.2 [7/8] MXZ-SM96 ø9.52 [3/8] ø22.2 [7/8] MXZ-SM120 ø12.7 [1/2]...
Page 157 4. Installing the refrigerant piping 4.3. Connecting pipes (Fig. 4-6) (Fig. 4-7) • Conduct sufficient anti-condensation and insulation work to prevent water drip- ping from the refrigerant piping. (liquid pipe/gas pipe) • Increase insulation depending on the environment where the refrigerant piping is installed, or condensation may occur on the surface of the insulation material. A Liquid pipe (Insulation material Heat-resistant temperature: 120 °C, 248 °F, Thickness: B Gas pipe...
Page 158 4. Installing the refrigerant piping 4.4. Refrigerant piping (Fig. 4-9) Remove the service panel A (5 screws) and the front piping cover B (2 screws) and rear piping cover D (4 screws). 1 Perform refrigerant piping connections for the indoor/outdoor unit when the outdoor unit’s stop valve is completely closed.
Page 159 4. Installing the refrigerant piping 4.5. Installing the refrigerant piping (main pipe) (Fig. 4-11) 4.5.1. Removing pinch connection pipes • Perform piping connection and valve operation according to the procedure. • Pinch connection pipes are attached to the on-site piping end of the liquid side and gas side operation valves when shipped from the factory in order to prevent gas leakage.
Page 160: Drainage Piping Work
4. Installing the refrigerant piping 4.6. Refrigerant pipe airtight testing method Airtight test (Fig. 4-13) Airtight test should be made by pressurizing nitrogen gas. For the test method, refer to the following figure. (1) Connecting the testing tool. Make a test with the stop valve closed. Be also sure to pressurize both liquid or high-pressure pipe and gas or low pressure pipe.
Page 161: Electrical Work
6. Electrical work 6.1. Caution 8 Only the transmission line specified should be connected to the terminal block 1 Follow ordinance of your governmental organization for technical standard for outdoor unit transmission. related to electrical equipment, wiring regulations and guidance of each electric (Transmission line to be connected with indoor unit : Terminal block TB3 for power company.
Page 162 6. Electrical work 6.3. Wiring transmission cables Types of control cables Connection restrictions 1. Wiring transmission cables • Controller name, symbol and allowable number of controllers. Types of transmission cables Shielding wire CVVS, CPEVS or MVVS Name Symbol Allowable number of controllers Cable diameter More than 1.25 mm [AWG16]...
Page 163 6. Electrical work 6.4. System control Example of an M-NET remote controller system (Address setting is necessary.) <Example for wiring control cables, wiring method and address setting, permissible lengths, and the constraint items are listed in the standard system with detailed explanation.> Example for the standard operation I Example of wiring transmission cables M-IC M-IC ( ) : Address (51) (01) (02) TB15 TB5 TB15 M1 M2 M1 M2 S M1 M2 S...
Page 164 6. Electrical work Example for the operation using 2 M-NET remote controllers I Example of wiring Transmission cables M-IC M-IC ( ) : Address (51) (01) (02) TB15 TB15 M1 M2 S M1 M2 S M1 M2 S M1 M2 S (101) (151) (102)
Page 165 6. Electrical work Example for the group operation I Example of wiring transmission cables Group M-IC(Main) M-IC(Sub) (51) ( ) : Address (01) (02) TB5 TB15 TB5 TB15 M1 M2 S M1 M2 S M1 M2 S M1 M2 S (101) M-NET RC Multiple CITY MULTI series indoor units operated together by 1 M-NET remote controller.
Page 166 6. Electrical work Example of a group operation system with 2 or more outdoor units and an M-NET remote controller. (Address settings are necessary.) I Examples of wiring transmission cables ( ) : Address (51) M-IC M-IC M-IC M-IC (01) (02) (05) (06)
Page 167 6. Electrical work I Permissible Lengths 1. Maximum transmission cable length via outdoor unit: L1+L2+L3+L4, L3+L4+L5+L6, L1+L2+L5+L6 ≤ 500 m [1640 ft] (1.25 mm² [AWG16] or more) 2. Maximum transmission cable length between indoor, branch box and outdoor unit: L1, L3+L4, L2+L5, L6 ≤ 200 m [656 ft] (1.25 mm² [AWG16] or more) 3. M-NET Remote controller cable length: 1, 2 + 3 ≤ 10 m [32 ft] (0.5 to 1.25 mm² [AWG20 to AWG16]) If the length exceeds 10 m [32 ft], use a 1.25 mm² [AWG16] shielded wire. The section of the cable that exceeds 10 m [32 ft] must be included in the maximum length via outdoor units and maximum transmission cable length.
Page 168 6. Electrical work I Wiring Method and Address Settings 1. Always use shielded wire when making connections between the outdoor unit (OC) and the indoor unit (M-IC). 2. Use feed wiring to connect terminals M1 and M2 on transmission cable terminal block (TB3) for the outdoor unit (OC) to terminals M1 and M2 on the transmission cable terminal block (TB5) of each CITY MULTI series indoor unit (M-IC).
Page 169 6. Electrical work I Constraint items (00) M-IC M-IC ( ) : Address (00) (00) TB15 TB15 M1 M2 S M1 M2 S M1 M2 S M1 M2 S MA-RC MA-RC MA-RC MA-RC MA-RC (Main) (Main) (Sub) (Main) (Sub) 3 MA remote controllers or more cannot be connected with the CITY MULTI series indoor unit of the same group. Example for the group operation I Example of wiring transmission cables (00)
Page 170 6. Electrical work Example of a group operation with 2 or more outdoor units and MA remote controllers. (Address settings are necessary.) I Examples of wiring transmission cables ( ) : Address M-IC M-IC M-IC M-IC (51) (01) (02) (05) (06) TB15 TB15...
Page 171 6. Electrical work I Permissible Lengths 1. Maximum line length via outdoor unit (M-NET cable): L1+L2+L3+L4, L3+L4+L5+L6, L1+L2+L5+L6 ≤ 500 m [1640 ft] (1.25 mm² [AWG16] or more) 2. Maximum transmission cable length between indoor and outdoor unit. (M-NET cable): L1 and L3+L4 and L2+L5 and L6 ≤ 200 m [656 ft] (1.25 mm² [AWG16] or more) 3. MA Remote controller cable length: m1 and m1+m2+m3 and m1+m2+m3+m4 ≤ 200 m [656 ft] (0.3 to 1.25 mm² [AWG22 to AWG16]) I Constraint items ( ) : Address (51) M-IC M-IC...
Page 172 6. Electrical work Example of a system using branch box and A-Control indoor unit I Examples of wiring transmission cables TB3A TB5/TB15 ( ) : Address Branch Box A-IC MA-RC (01) (51) TB3B TB5/TB15 M1 M2 S M1 M2 S A-IC MA-RC (02)
Page 173 6. Electrical work I Permissible Lengths 1. Maximum line length via outdoor unit (M-NET cable): L1+L2+L3+L4+L5 ≤ 500 m [1640 ft] (1.25 mm² [AWG16] or more) 2. Maximum transmission cable length between Branch box and outdoor unit. (M-NET cable): L1+L2, L3+L4, L5 ≤ 200 m [656 ft] (1.25 mm² [AWG16] or more) 3. Maximum transmission cable length between branch box and outdoor unit. (A-Control cable): L6 ≤ 25 m [82 ft] (1.5 mm² [AWG14]) 4.
Page 174 6. Electrical work 6.5. Wiring of main power supply and equipment capacity A Switch (Breakers for Wiring and Current Leakage (if you use)) B Outdoor Unit C Branch Box D A-Control indoor unit (M, S, P series indoor unit) E CITY MULTI series indoor unit F Pull Box Schematic Drawing of Wiring: When Not Using a Branch box (Example) (Fig.
Page 175 6. Electrical work Minimum wire thickness (mm /AWG) Local switch (A) Ground-fault interruper *1 Breaker for wiring Total operating current of the indoor unit (if you use) (NFB) Main Cable Branch Ground Capacity Fuse F0 = 15 A or less *2 2.1/14 2.1/14 2.1/14...
Page 176 6. Electrical work IMPORTANT Make sure that the current leakage breaker is one compatible with higher harmonics. Always use a current leakage breaker that is compatible with higher harmonics as this unit is equipped with an inverter. The use of an inadequate breaker can cause the incorrect operation of inverter. Never splice the power cable or the indoor-outdoor-branch box connection cable, otherwise it may result in a smoke, a fire or communication failure.
Page 177 6. Electrical work 6.6. Address setting Switch address setting Unit Branch box M, S, P CITY MULTI Outdoor series Indoor series Address Address Connection Setting Switch None tens ones tens ones tens ones digit digit digit digit digit digit SWU2 SWU1 SW12 SW11 SW12...
Page 178 6. Electrical work E.g. 2. Outdoor + Branch <1> (M, S, P series Indoor A, C, E) + Branch <2> (M, S, P series Indoor A, C, E) *1 Outdoor address Branch box <1> Branch box <1> start address + 50 = 01 + 50 = 51 address (01) *2 *2 Branch box <1> SW1-1, 3, 5 ON Outdoor A-port address = Start address = 01 SW1-2, 4 B-port address no connection address C-port address = Start address + 1 = 02 (01) = A-port M, S, P series Indoor (51) *1...
Page 179: Test Run
7. Test run 7.1. Before test run ► After completing installation and the wiring and piping of the indoor and • The insulation resistance drops due to accumulation of refrigerant in the compressor. The resistance will rise above 1 MΩ after the compressor is outdoor units, check for refrigerant leakage, looseness in the power sup- ply or control wiring, wrong polarity, and no disconnection of one phase warmed up for 12 hours.
Page 180: Special Functions
8. Special Functions 8.1. OUTDOOR UNIT INPUT/OUTPUT CONNECTOR • State (CN51) A Distant control board E Lamp power supply B Relay circuit F Procure locally C External output adapter (PAC-SA88HA-E) G Max. 10 m [32 ft] CN51 D Outdoor unit control board L1: Error display lamp L2: Compressor operation lamp X, Y: Relay (coil rating: ≤...
Page 182 <ENGLISH> English is original. The other languages versions are translation of the original. CAUTION • Refrigerant leakage may cause suffocation. Provide ventilation in accordance with EN378-1. • Be sure to wrap insulation around the piping. Direct contact with the bare piping may result in burns or frostbite. • Never put batteries in your mouth for any reason to avoid accidental ingestion. • Battery ingestion may cause choking and/or poisoning. • Install the unit on a rigid structure to prevent excessive operation sound or vibration. • The A-weighted sound pressure level is below 70dB. • This appliance is intended to be used by expert or trained users in shops, in light industry and on farms, or for commercial use by lay persons. <FRANÇAIS> L’anglais est l’original. Les versions fournies dans d’autres langues sont des traductions de l’original. PRECAUTION • Une fuite de réfrigérant peut entraîner une asphyxie. Fournissez une ventilation adéquate en accord avec la norme EN378-1. • Assurez-vous que la tuyauterie est enveloppée d’isolant. Un contact direct avec la tuyauterie nue peut entraîner des brûlures ou des engelures. •...
Page 183 MXZ-SM*TAM series NTXMSM* series...
Page 184 This product is designed and intended for use in the residential, commercial and light-industrial environment. Please be sure to put the contact address/telephone number on this manual before handing it to the customer. HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN BT79A046H04 Printed in Thailand...

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Mitsubishi Electric MXZ-SM72TAM-U1 Service Manual

R410A January 2023 Och800 Service Manual

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