Mitsubishi Electric M Series Service Manual

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M-SERIES

Air Conditioners

SVZ-AP48NL*

SERVICE MANUAL

For use with R454B

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Summary of Contents for Mitsubishi Electric M Series

Page 1 M-SERIES Air Conditioners SVZ-AP48NL* SERVICE MANUAL For use with R454B...
Page 2 13.6. Trouble criterion of main parts ..................59 13.7. Thermistor ........................ 61 13.8. DC Fan motor (fan motor/indoor controller board) ............62 13.8.1. DC Fan motor measuring points ..............63 Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 3 14.5. Refrigerant leak sensor ....................68 15. Appendix A: Quick reference worksheet (minimum room area requirement) ......71 16. Appendix B - High altitude applications - capacity reduction factors ......... 77 Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 4 Service personnel are required to carefully read the OPERATING INSTRUCTIONS and INSTALLATION MANUAL before operation. Further information is available in the OPERATING INSTRUCTIONS, INSTALLATION MANUAL, and the like. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 5 When installing or relocating, or servicing sources (for example: open flames, an the air conditioner, use only the specified refrigerant written on outdoor unit to charge Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 6 Charging should be performed with the cylinder of siphon stood vertically. (Refrigerant is . . . charged from liquid phase.) Electronic weighing scale Unit Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 7 – Verify any person performing work near where flammable refrigerant is used is properly informed prior to work commencing of the risks and safety precautions associated with flammable refrigerant and the nature of the work being done. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 8 If the refrigerant is charged from gas phase, composition of refrigerant will change and composition change may occur in refrigerant the efficiency will be lowered. and the efficiency will be lowered. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 9 • Have a dry powder or CO2 General work area fire extinguisher adjacent to the • All maintenance staff and others charging area. working in the local area shall be Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 10 • The following checks shall be That capacitors are discharged: this shall be applied to installations using done in a safe manner to FLAMMABLE REFRIGERANTS: avoid possibility of sparking. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 11 (25 % maximum) cylinders if venting is not allowed is confirmed. by local and national codes. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 12 The recovery process is supervised REFRIGERANT contained in them. at all times by a competent person Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 13 When transferring refrigerant into cylinders, ensure that only appropriate Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 15 – Verify all field pipe joints are vacuum tested prior to refrigerant charging. ◦ Verify all indoor field-made joints are tightness tested with 0.25 times the MAXIMUM ALLOWABLE PRESSURE, with NO LEAK DETECTED. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 16 Approved electric heater kits manufactured for Mitsubishi Electric US, Inc. includes electric heat kits manufactured for Mitsubishi Electric US, Inc. that are allowed for use with the listed air handlers. These tables are found in the chapter Indoor unit accessories found in the Installation manual.
Page 17 These requirements are in relation to the following refrigerant vapors do not have the opportunity to categories: Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 18 Anv requirements. unbalanced heating / cooling / airflow. – Almost every combination of Mitsubishi Electric • When zone dampers are used, they must be US, Inc. indoor unit / outdoor unit are...
Page 19 < 1m (3 ft 3 3/8 in) Case C NOTE For systems certified as ETRS the following ventilation requirement can be substituted: A nvETRS ⩾ 114cm 2 or 22in 2 Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 20 9 [96] 6 [64] 3 [32] 0 [0] [2.2] [4.4] [6.6] [8.8] [11] [13.2] [15.4] [17.6] [19.8] [22] [24.2] [26.4] [28.6] [30.8] [33] Planned System Charge (kg) [lbs] Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 21 Additional space/ventilation is required 8.5 [91] 8 [86] [2.2] [4.4] [6.6] [8.8] [11] [13.2] [15.4] [17.6] [19.8] [22] [24.2] [26.4] [28.6] [30.8] [33] Planned System Charge (kg) [lbs] Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 22 Purge the circuit with inert gas. Evacuate Continuously flush or purge with inert gas when using a flame to solder or de-solder. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 23 • Do not mix refrigerants in recovery units and especially not in cylinders. • Never heat the compressor body with an open flame or any other ignition sources to accelerate the process. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 24 The fan will automatically start when refrigerant as during system commissioning, or when advised leak is detected by refrigerant leak sensor. Keep by Mitsubishi Electric US, Inc. service personnel, or a safe distance from the fan to avoid injury. when required by local codes and regulations.
Page 25 2.8. Disposal of R454B Recover the refrigerant and recycle it. If recycling is not possible then it should be incinerated by a licensed facility. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 26 SVZ-AP48NL* 3. Part Names and Functions Table 1. Indoor unit Vertical Horizontal Right Downflow Horizontal left Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 27 (low-mid-high) Minimum circulation airflow 1485 External static pressure in. WG 0.30 - 0.50 - 0.80 [Pa] [75 - 125 - 200] [→Specified in UL60335-2-40] [→Specified in UL60335-2-40] Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 28 External static pressure: 75Pa, 0.30 [in. WG], Power source: 208/230 V, 60Hz IMPORTANT *. 200 Pa (0.80 in WG) does not have "Rated point". NOTE For downflow fan performance and corrected airflow, please see downflow kit manuals. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 29 External static pressure: 125Pa, 0.50 [in. WG], Power source: 208/230 V, 60Hz Airflow rate (m3/min) Airflow rate (CFM) External static pressure: 200Pa, 0.80 [in. WG], Power source: 208/230 V, 60Hz Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 30 SVZ-AP48NL* Air filter [0.100] [0.080] 30,36 [0.060] 12, 18, 24 [0.040] [0.020] [353] [706] [1059] [1412] [1766] Airflow rate (m /min)[cfm] Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 31 SVZ-AP48NL* 6. Sound Pressure Levels 6.1. Sound pressure level Multi-Position Aux.duct Front side 3-1/4ft. (1m) Measurement location Aux.duct Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 32 SVZ-AP48NL* 6.2. NC Curves Table 3. Model code 48, External static pressure 0.30, 0.50, 0.80 in WG (75, 125, 200 Pa). Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 35 SVZ-AP48NL* 7. Dimensions Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 36 (20 x 20 x 1) (18-13/16 x 15-7/8) (3/8) (5/8) Model code 382.6 266.5 (21) (18-13/16) (15-1/8) (10-1/2) Model code 1,113.8 935.5 (43-7/8) (19-1/16) (37-9/16) (31-3/16) (18-3/16) 8. Wiring Diagram Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 37 (HEAVY DOTTED LINE): Field wiring Ÿ„ z– (Thin dotted line): Optional parts Use copper supply wire. >- q— � z– \Œ z– v p“ v q— ® ŽW p“ Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 38 The heater will not operate if the following errors are active. In these cases, the error must be corrected, and the system restarted in order to recover heater function: – Remote controller communication error (E4, E5) Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 39 Time delay can only be selected with MA controller. If use of a non-MA controller is desired, the time delay must first be selected with the MA controller. Then the non-MA controller can be attached and used. All delay times are approximate. The default time delay setting is 24 minutes. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 40 ) > 2.7 °F [1.5 not increasing faster EH2 ON °C] than 0.9 °F [0.5°C] in 7 min EH1 OFF ⑥ ) < 0.9 °F [0.5°C] EH2 OFF Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 41 Factory setting While the heater is on, the fan will operate at high speed regardless of the fan setting on the remote controller. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 42 Select the heater output pattern (1st = CN24 or 2nd = CN24A) to use, and connect the cable to the connector on the indoor unit control board that corresponds to the selection. Panel heater connector Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 43 Control board CN24 or CN24a 1-phase power supply, 208V, 230V, 60Hz – FS1, 2: Thermal fuse – H1, H2: Heater – 26H: Overheat protection thermostat – 88H: Electromagnetic Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 44 Factory setting Remote controller Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 45 When fan speed setting by RC is "Auto", Fan speed is fixed to "HIGH". 13. Troubleshooting 13.1. Cautions on troubleshooting Check the power supply voltage. CAUTION Check the indoor/outdoor connecting wire for miswiring. (1) Before troubleshooting, check the following: Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 46 See the sub-section Service note: servicing and replacing the refrigerant leak sensor found in chapter Mount positions for basic information about the refrigerant leak sensor location and replacement. A complete procedure can be found in the Indoor Unit service manual. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 47 “0”. LED 3: communication between Indicates state of communication between the indoor and outdoor units. Make sure that this LED is always blinking. indoor and outdoor units Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 48 The AUTO RESTART FUNCTION will restart the unit within a time delay of 5 to 10 minutes after power is restored. Set the AUTO RESTART FUNCTION using the remote controller. (Mode no. 01) Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 49 The heater will not operate if the following errors are active. In these cases, the error must be corrected, and the system restarted in order to recover heater function: • Remote controller communication error (E4, E5) • M-NET communication error (A0-A8) • Air intake sensor error (P1) Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 50 Replace indoor controller board if there is abnormal difference with actual room temperature. Turn the power off, and on again to operate after check. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 51 Operate with connector (CN4F) 4 of connector CN4F is not short- board short-circuited. Refer to 12-5. circuited.) Replace indoor controller board Constantly detected during if abnormality reappears. operation. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 52 • Indoor controller board is after six-minute resume prevention mode. defective. Defective outdoor fan control Overcharge of refrigerant 7 Defective refrigerant circuit (clogs) Bypass circuit of outdoor unit is defective Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 53 ˚F] or more Open: -40 ˚C [-40 ˚F] or Defective indoor controller less 5. When no problems are found in board 1–4 above, replace the indoor unit control board. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 54 30 continuous times. (Error code: E5) Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 55 • Check the connection of parts such as connectors and turn the power on again. • If the error does not clear, replace the Refrigerant leak sensor. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 56 When the number of rotations is Replace the failed motor. Motor failure detected to be above the upper limit for 30 seconds. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 57 Defective remote controller if LED 2 is blinking, remote controller is defective; if LED 2 is lit, connection failure of remote controller terminal block etc. has returned to normal. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 58 Indoor controller board C351 (* 1 ) C084 (* 1 ) PC352 (* 1 ) CN20 �CN3C CN2Y CN44 CNSA CN24A CN4F CN51 CN25 CN24 CN2L CN105 CNSC CN485 Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 59 Measure the resistance with a tester. thermistor / liquid (Part temperature 10C (50F) ~ 30C (86F)) (TH2) Normal Abnormal Condenser / evaporator 4.3k~9.6k Opened or short-circuited temperature thermistor (TH5) Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 60 After turning off the indoor unit breaker and leaving it for 5 minutes, measure the resistance value between the sensor terminals. Back side of the sensor Measure across both sides of the sensor pin Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 61 (˚C) -20 -10 0 10 20 30 40 50 30°C (86°F) 4.3 k" ˚F -4 14 32 50 68 86 104 122 40°C (104°F) 3.0 k" Temperature Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 62 Replace the fan motor. of connector CNMF repeat 0V and 5V? Check the operation of fan. Check the operation of fan. Replace indoor controller board. Replace indoor controller board. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 63 Jumper Functions Setting by the dip switch and Remarks wire jumper wire Model for service board settings Model code Service Board Capacity settings Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 64 : Short : Open 14. Disassembly Procedure CAUTION Exercise caution when removing heavy parts. 14.1. Control Box 1. Remove the electric panel (2 screws). Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 65 4b. Remove the brackets which secure the coil assembly. 4c. Slide the coil assembly out of the air handler cabinet. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 66 1. Remove the Blower and Filter panel (along with filter if installed) indicated in section 2. 2. Remove the (1 or 2) brackets that secure the coil assembly. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 67 2. Remove the blower panel (2 screws). 3. Remove the cover over the Return Air thermistor box and unplug the thermistor. 4. Pull out the thermistor holder and thermistor inside the box. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 68 For horizontal installations, follow Step. 1 - 4 and 6. Step. 1 Remove the panel marked “FILTER”. Step. 2 Remove the panel marked “BLOWER”. Step. 3 Remove the panel marked “ELECTRICAL”. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 69 Remove the “1st” panel and “2nd” panel marked “COIL”. Step. 4b Next, remove the smaller panels covering the drain holes and refrigerant lines by first sliding in the directions indicated here. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 70 PCB.The refrigerant leak sensor PCB is then replaced, and the cable is reused. The same steps can be followed in reverse to reassemble the indoor unit after service is completed. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 71 All safety precautions and instructions must be followed as stated in the Installation manual. What is the factory refrigerant pre-charge of the outdoor unit (ODU)? Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 72 Now, find the total areas of each Zone (as defined in the installation manual) and add the room areas together to find the total TA for each zone. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 73 • Yes or No (circle one) If A and B are YES, then proceed with installation. If A and/or B are NO, then additional area, ventilation, or installation height required. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 74 10.5 [113.1] 10.5 [113.1] 94.6 [1018.3] 43 [462.9] 22.9 [246.5] 10.5 [113.1] 14.4 [31.7] 44.3 [476.9] 44.3 [476.9] 10.7 [115.2] 10.7 [115.2] 97.3 [1047.4] 44.3 [476.9] 23.5 [253] 10.7 [115.2] Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 75 38.2 [411.2] 10.5 [113.1] 43 [462.9] 43 [462.9] 10.5 [113.1] 10.5 [113.1] 14.4 [31.7] 162.2 [1746] 44.3 [476.9] 39.1 [420.9] 10.7 [115.2] 44.3 [476.9] 44.3 [476.9] 10.7 [115.2] 10.7 [115.2] Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 76 Mrel, a smaller refrigerant amount that will not be recovered during leak mitigation. 10.4 10.9 11.4 11.9 12.4 12.9 13.4 13.9 14.4 Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 77 2,000 0.93 0.98 3,000 0.90 0.98 4,000 0.86 0.97 5,000 0.83 0.96 6,000 0.80 0.95 7,000 0.77 0.94 8,000 0.74 0.94 9,000 0.71 0.93 10,000 0.69 0.92 Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
Page 78 This product is designed and intended for use in the residential, commercial and light-industrial environment. MITSUBISHI ELECTRIC US, INC. MEUS DOC# MD-2325-K027 Ver. 1 May 2025 © 2025 Mitsubishi Electric US, Inc. Specifications are subject to change without notice.

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