This document provides a comprehensive service manual for Midea portable air conditioners, covering models in both the N and N1 series. It includes safety precautions, installation details, technical specifications, operational features, and troubleshooting procedures.
Function Description
The Midea portable air conditioner is designed to provide cooling, heating (for some models), dehumidification (dry mode), and fan-only operation. It is a consumer air conditioner, not a precision refrigerant system, and is intended for general room climate control. The unit operates by drawing in room air, processing it through a refrigeration cycle, and discharging conditioned air. It features a single louver for air direction and a straight condenser for efficient heat exchange. The unit is designed with a "no water tank" feature, implying an advanced shower system or self-evaporating mechanism for condensate management.
Important Technical Specifications
The manual details specifications for various models, including cooling capacity (Btu/H), Energy Efficiency Ratio (EER), current draw (Amps Cool), power consumption (Watts Cool), compressor type, refrigerant type (R410A), refrigerant amount (oz/g), design pressure (Psig), and air flow (M³/H(CFM)).
For example, the MPN-05CRN1-BH2(H) model has:
- Cooling: 5000 Btu/H
- EER: 8.2
- Amps (Cool): 5.4 A
- Watts (Cool): 600 W
- Compressor: 39A121AA&54KA
- Refrigerant: R410A, 10.2/290 oz/g
- Design Pressure: 550/340 Psig
- Air Flow: 360/310/270 M³/H(CFM)
Another example, the MPN1-12CRN1-BH9 model has:
- Cooling: 12000 Btu/H
- EER: 8.9
- Amps (Cool): 11.9 A
- Watts (Cool): 1340 W
- Compressor: EA103M1C-1DZDU1
- Refrigerant: R410A, 15.2/430 oz/g
- Design Pressure: 550/340 Psig
- Air Flow: 470/430/370 M³/H(CFM)
Compressors are single-phase, 115 or 230/208 volt, permanent split capacitor type, using a running capacitor across the start and run terminals. They are internally spring-mounted and externally mounted on rubber isolators.
Usage Features
The portable air conditioner offers several user-friendly features:
- Mode Selection: Users can select from AUTO, COOL, DRY, FAN, and HEAT (for cooling-only models, HEAT is not available).
- Timer Function: Allows setting AUTO ON start time and AUTO OFF stop time programs.
- Temperature Adjustment: Temperature settings can be adjusted in 1°C/2°F increments within a range of 17℃ (62°F) to 30℃ (88℉). The timer setting can be adjusted from 0 to 24 hours. The display can switch between Fahrenheit and Celsius by pressing and holding the Up and Down buttons simultaneously for 3 seconds.
- Fan Speed Control: Three fan speeds are available: LOW, MED, and HI.
- Sleep Mode: Initiates a SLEEP operation for comfortable nighttime use.
- ION Button (optional): Activates an ion generator to remove pollen and impurities from the air.
- Swing Function (optional): Allows the louver to swing up to a 6° angle per press, or continuous auto-swing by pressing the button for more than 2 seconds.
- Turbo Cooling Function: Provides rapid cooling.
- Flexible Air Exhaust: Facilitates easy installation and exhaust hose management.
- Advanced Shower System: Likely refers to an efficient condensate management system, possibly self-evaporating.
- Follow Me Function: Allows the unit to sense the temperature at the remote control's location for more precise comfort.
- 24-hour On/Off Timer: Provides flexibility in scheduling operation.
- No Water Tank Design: Eliminates the need for manual condensate draining in most operating conditions.
Maintenance Features
The manual outlines several maintenance and troubleshooting procedures:
- Safety Precautions: Emphasizes professional installation, avoiding self-repair, caution with sharp edges, ensuring proper power cable handling, and not operating with flammable gases nearby. It also advises disconnecting power during cleaning or prolonged non-use.
- Installation: Requires a flat, spacious location with a minimum clearance of 30cm from walls or obstacles. The plug must be accessible, and wiring should comply with national rules. Detailed instructions are provided for installing the exhaust hose and window panel kits for both double-hung and sliding sash windows.
- Cleaning: Recommends using a soft cloth for cleaning and avoiding harsh detergents. Air filters should be cleaned every two weeks or more often if necessary.
- Compressor Testing: Procedures for checking compressor continuity (C-S, C-R, R-S terminals) and for ground faults using an ohmmeter. It also describes how to check for compressor inefficiency due to faulty valves by monitoring high and low side pressures and temperature difference across the coil.
- Overload Protection: Explains external and internal overload mechanisms and how to test them for continuity.
- Refrigerant System Repairs: Detailed steps for sealed refrigeration system repairs, including refrigerant recovery, component replacement (compressor, condenser, evaporator, capillary tube, filter drier), leak testing with dry nitrogen and halogen leak detectors, evacuation to a deep vacuum (200 microns or less), and precise refrigerant charging. It also covers special procedures for compressor motor burnout, including flushing the system.
- Fan Motor Testing: Instructions for checking the fan motor capacitor and testing motor speeds by applying power to specific wires.
- Capacitor Testing: Describes how to visually inspect capacitors for damage and how to test them using an ohmmeter for continuity and deflection. A table of temperature sensor resistance values (Temp.°C vs. Resistance KΩ) is provided for diagnostic purposes.
- Troubleshooting Guide: A comprehensive table of common problems, possible causes, and remedies, covering issues like no power, remote control failure, fan motor not running or making noise, compressor not running, excessive noise, water full alarm, and poor cooling/heating performance. This includes checks for power supply, transformer, PCBs, batteries, fan motor bearings, wiring, temperature settings, and refrigerant levels.
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