Mitsubishi Electronics MSZ-FD09NA service manual Cool Operation, DRY Operation, Heat Operation

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8-1. COOL ( ) OPERATION

(1)Press OPERATE/STOP (ON/OFF) button.

POWER lamp of the indoor unit turns on with a beep tone.

(2)Select COOL mode with OPERATION SELECT button.

(3)Press TEMPERATURE buttons (TOO WARM or TOO COOL button) to select the desired temperature. The setting range is 61 ~ 88°F (16 ~ 31°C).

1.Coil frost prevention

The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the coil from frosting.

When the temperature of indoor heat exchanger becomes too low, the coil frost prevention mode works.

The indoor fan operates at the set speed and the compressor stops. This mode continues until the temperature of indoor heat exchanger rises.

2.Low outside temperature operation

When the outside temperature is lower, low outside temperature operation starts, and the outdoor fan slows or stops.

8-2. DRY ( ) OPERATION

(1)Press OPERATE/STOP (ON/OFF) button.

POWER lamp of the indoor unit turns on with a beep tone.

(2)Select DRY mode with OPERATION SELECT button.

(3)The set temperature is determined from the initial room temperature.

1.Coil frost prevention

Coil frost prevention is as same as COOL mode. (8-1.1.)

2.Low outside temperature operation

Low outside temperature operation is as same as COOL mode. (8-1.2.)

8-3. HEAT ( ) OPERATION

(1)Press OPERATE/STOP (ON/OFF) button.

POWER lamp of the indoor unit turns on with a beep tone.

(2)Select HEAT mode with OPERATION SELECT button.

(3)Press TEMPERATURE buttons (TOO WARM or TOO COOL button) to select the desired temperature. The setting range is 61 ~ 88°F (16 ~ 31°C).

1.Cold air prevention control

When the compressor is not operating or is starting, and the temperature of indoor heat exchanger and/or the room tem- perature is low or when defrosting is being done, the indoor fan will stop or rotate in Very Low speed.

2.High pressure protection

The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the con- densing pressure from increasing excessively.

When the temperature of indoor heat exchanger becomes too high, the high pressure protection works.

The indoor fan operates following the cold air prevention control. This mode continues until the temperature of indoor heat exchanger falls.

3.Defrosting

Defrosting starts when the temperature of outdoor heat exchanger becomes too low.

The compressor stops once, the indoor/outdoor fans stop, the 4-way valve reverses and the compressor re-starts. This mode continues until the temperature of outdoor heat exchanger rises or the fixed time passes.

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Contents MSZ-FD09NA MSZ-FD12NA Specification has been corrected New model Part Names and Functions AccessoriesWeight External finish Power supply Phase, Hz 208/230Remote controller Indoor modelOutlet AIR Speed and Coverage Range Operating RangeUnit inch Outlines and DimensionsAir Air outWiring Diagram Unitinch Refrigerant System DiagramRefrigerant flow in cooling Refrigerant flow in heating Timer Short Mode Service FunctionsHow to modify the remote controller P.C. board P.C. Board Modification for Individual OperationAuto Restart Function How to release Auto Restart FunctionOperation Refer to Microprocessor ControlLamp lights during operation Lamp blinks in abnormal conditionDRY Operation Cool OperationHeat Operation Mode selection Auto Change Over ··· Auto Mode OperationAuto Vane Operation Outdoor Unit MXZ seriesFeet, set the horizontal DirectionVertical vane See Control Operation Area SettingSee Sensor Enlarged view of i-see SensorNighttime Cold area DaytimeLighted Not lighted Center ····· Operation and operating rangeProgram Timer Changing temperature indication F/C Minute Time Delay OperationEMERGENCY/TEST Operation Before troubleshooting, check the following TroubleshootingLead wiring Housing point Troubleshooting procedure How to replace batteriesOFF Failure Mode Recall FunctionPower Indoor unit failure mode tableInstruction of Troubleshooting Lighted Blinking Troubleshooting Check TableArea R Power Trouble Criterion of Main Parts MSZ-FD09NAMSZ-FD12NA Check of indoor fan motor Troubleshooting FlowPage Replace the horizontal vane motor, How to check miswiring and serial signal error Electromagnetic noise enters into TV sets or radios Indoor electronic control P.C. board Test Point Diagram and VoltageSW P.C. Board Power monitor receiver P.C. board Monitor P.C. board Removing the panel Photo Disassembly InstructionsOpen the rear cover of the power monitor receiver P.C Operating Procedure PhotosRemoving the electrical box Photo Removing the nozzle assemblyPhoto Removing the vertical vane motor unit Correct positionRemoving the indoor fan motor and the line flow fan Photo Removing the horizontal vane motor PhotoMade in Japan

MSZ-FD09NA specifications

The Mitsubishi Electronics MSZ-FD09NA is a wall-mounted split-type air conditioning unit that exemplifies the brand's commitment to efficiency, comfort, and advanced technology. This unit is designed to provide optimal cooling and heating solutions for residential and light commercial spaces, ensuring a comfortable environment year-round.

One of the standout features of the MSZ-FD09NA is its impressive energy efficiency rating. With a high SEER (Seasonal Energy Efficiency Ratio) rating, it utilizes less energy while maintaining high performance, which can lead to significant cost savings on utility bills. This unit adheres to modern energy conservation standards, making it an environmentally friendly choice that appeals to eco-conscious consumers.

The MSZ-FD09NA is equipped with Mitsubishi’s advanced inverter technology, which allows the compressor to adjust its speed according to the desired temperature. This ensures that energy is used efficiently and that fluctuations in temperature are minimized, resulting in enhanced comfort levels. The inverter technology also helps in reducing noise levels, creating a quieter operation compared to traditional HVAC systems.

Another remarkable characteristic of the MSZ-FD09NA is its sleek and modern design, which seamlessly integrates into various interior décors. The unit is available in a clean white finish, making it an unobtrusive addition to any room. Furthermore, it has a compact design that maximizes floor space while providing powerful performance.

The unit also features cutting-edge air filtration systems designed to purify indoor air. With a multi-stage filtration process, including a catechin filter and an anti-allergen enzyme filter, the MSZ-FD09NA effectively captures dust, allergens, and other airborne particles. This feature is particularly beneficial for those with respiratory issues or allergies, contributing to a healthier living environment.

In addition, the MSZ-FD09NA is compatible with smart control options. Users can control their air conditioner remotely through a smartphone app, making it convenient to adjust settings from anywhere. This smart technology allows for programmable scheduling, enabling users to optimize the unit's operation based on their lifestyle.

In summary, the Mitsubishi Electronics MSZ-FD09NA stands out due to its energy efficiency, advanced inverter technology, modern design, high-quality air filtration, and smart control options, making it an excellent choice for those seeking reliable heating and cooling solutions.
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