After stopping the operation of the air conditioner, turn off the power supply breaker and remove the power plug. Discharge the capacitor before work involving the electrical parts. lt;Precautions during the repair service>. When repairing or inspecting the circuit must be done without turning off the power, be very careful not to touch the live parts.
The correct coolant is specified in the manuals and on the specification labels supplied with our products. We will not be responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by failure to follow instructions. Connecting these models to outdoor units of the MUZ-FH·VE(HZ) series enables low standby power control.
These models can possibly be connected to the MUZ-FH·VE(HZ) series once they have been connected to the MXZ series and operated, for example due to moving. In that case, the MUZ-FH·VE(HZ) series outdoor units will not operate without taking a step. Felt tape (for left or left rear pipes) 1 Air purification filter. Electrostatic anti-allergy enzyme filter) 1 Air purification filter (odor filter) 1.
Felt tape (For left or left rear pipes) 1 Air cleaning fi lter. Silver-ionized air purification fi lter) 1 Air purification fi lter (Deodorizing fi lter) 1.
8-1. TIMER SHORT MODE
8-2. HOW TO SET REMOTE CONTROLLER EXCLUSIVELY FOR A PARTICULAR INDOOR UNIT A maximum of 4 indoor units with wireless remote controllers can be used in a room
SERVICE FUNCTIONS8
8-3. SETTING THE INSTALLATION POSITION
8-4. AUTO RESTART FUNCTION
Operation
NOTE
WIRELESS REMOTE CONTROLLER
MICROPROCESSOR CONTROL9
INDOOR UNIT DISPLAY SECTION
9-2. DRY ( ) OPERATION
Coil frost prevention
9-4. HEAT ( ) OPERATION
Cold air prevention control
High pressure protection
Defrosting
9-1. COOL ( ) OPERATION
Low outside temperature operation
Indoor fan speed control
If two or more indoor units are operating in a multi system, it may happen that the indoor unit operating in (AUTO) cannot switch to another operation mode (COOL ↔ HEAT) and enter standby mode. A multi-system air conditioner can connect two or more indoor units to one outdoor unit. When trying to operate two or more indoor units simultaneously with one outdoor unit, one for cooling and the other for heating, the operation mode of the indoor unit that operates first is selected.
Other indoor units cannot operate, and the operation indicator lamp flashes as shown in the figure below. When indoor unit starts operation while defrosting outdoor unit, it takes a few minutes (max. 10 minutes) to blow out the hot air. In the heating, although the indoor unit that is not working may become hot or the sound of refrigerant flowing may be heard, it is not malfunctioning.
The direction of rotation, speed and angle of the motor are controlled by pulse signals (approximately 12 V) transmitted by the internal microprocessor. During COOL or DRY operation with the blade angle at angle 4 or 5 when the cumulative working time of the compressor exceeds 1 hour, the blade angle automatically changes to angle 3 for dew prevention. NOTE: Right and left horizontal bars placed at the same level may not line up perfectly.
Confirmation of default position is performed in the following cases:. a) When the operation starts or ends (including timer operation). In VANE AUTO mode, the microprocessor automatically determines the angle to achieve the optimal room temperature distribution. NOTE: When 2 or more indoor units are operated with multi outdoor unit, even if one indoor unit turns off the thermostat, this control does not work in the indoor unit.
When the ECONO COOL button is pressed in COOL mode, the set temperature is automatically set 2°C higher by the microprocessor. The air conditioner automatically adjusts the fan speed and set temperature and uses the POWERFUL mode. To cancel this operation manually, select another mode or press one of the following buttons within 15 minutes after starting operation: OPERATE/STOP (ON/OFF) (MSZ-FH25/35/50VE)/STOP/OPERATE (OFF/ ON) (MSZ-FH25/35/50VE2), ECONO COOL, FINISHER SPEED CONTROL, NATURAL FLOW or i-save button.
Vertical vane (1) Vane motor drive
SWING)
To release the timer
PROGRAM TIMER
9-8. WEEKLY TIMER OPERATION
How to set the weekly timer
When the weekly timer is ON, the day of the week whose timer setting is complete is lit.
Checking weekly timer setting Checking weekly timer setting
9-11. NATURAL FLOW ( ) OPERATION
9-12. AIR PURIFYING ( ) OPERATION
How to set i-save operation
How to cancel operation
Take care of the following during servicing
Troubleshooting procedure
How to replace batteries
TROUBLESHOOTING10
10-2. FAILURE MODE RECALL FUNCTION Outline of the function
- Flow chart of failure mode recall function for the indoor/outdoor unit
- Flow chart of AIR PURIFYING power failure mode recall function
- AIR PURIFYING power operation check
- Indoor unit failure mode table POWER lamp Abnormal point
- AIR PURIFYING power failure mode table
- Operation check on i-see SENSOR
Be sure to release the error mode recall function after setting it up, otherwise the device may not work properly. With the remote control pointed at the indoor unit, press the TOO COOL or TOO WARM button to adjust the set temperature to 23 °C. Check the flashing pattern and identify the abnormal point with the AIR PURIFYING power failure condition table (10-2.5.).
Press the OPERATE/STOP (ON/OFF) (MSZ-FH25/35/50VE)/STOP/OPERATE (OFF/ON) (MSZ-FH25/35/50VE2) button on the remote control (the set temperature is displayed) with the remote control pointed at indoor unit. The lock switch (air cleaner) is operated by opening the front panel and the AIR CLEANER power is cut off. AIR PURIFIER power is turned on when the PURIFIER button on the remote control is pressed with any set temperature displayed during the fail mode recovery function.
Check the operation display section on the remote control to confirm that the AIR CLEANER power is activated. See characteristics of main internal coil thermistor, auxiliary internal coil thermistor (10-7.). The speed feedback signal is not output for 12 seconds after the indoor fan motor is running.
When the air purification function cannot be turned off even if the air purification function is turned off with the remote control. As soon as an abnormality is detected, the air purifier is switched off. Therefore, a measuring instrument that records the voltage wave is needed to perform the above-mentioned voltage measurement. While recalling the error data, set the temperature to 19°C to perform the simple check of the i-see SENSOR.
10-3. INSTRUCTION OF TROUBLESHOOTING
10-4. TROUBLESHOOTING CHECK TABLE
The operation mode of each indoor unit is set differently to COOL (includes DRY, FAN) and HEAT at the same time, the operation mode of the indoor unit which operated first has priority.
10-5. TROUBLE CRITERION OF MAIN PARTS
A Check of indoor fan motor 10-6. TROUBLESHOOTING FLOW
B Check of remote controller and indoor electronic control P.C. board Check if the remote controller is exclusive for this air conditioner
C Check of indoor P.C. board and indoor fan motor
D How to check miswiring and serial signal error MUZ-25/35
MUZ-FH50
Lights up the indoor POWER lamp. lt;Confirming the power of the indoor unit>. Are there faulty wiring, poor contact or wire disconnection of the indoor/outdoor connection wire. Are there faulty wiring, poor contact or wire disconnection of the indoor/outdoor connection wire.
Check for intermediate connection of the indoor/outdoor connecting wire, loose connection with the terminal block, and cut wire inside the cable. If the trouble occurs or does not occur depending on whether the light is on or off, distance the lighting from the indoor unit or apply the glass filter to the receiving part of the indoor unit. Pass the indoor/outdoor connecting wire through a different route than the existing wiring as arranged below:.
7KHLQGRRURXWGRRUFRQQHFWLQJZLUH is diverted and runs long. indoor/outdoor connecting wire from the outdoor terminal block connected to the indoor unit indicating miswiring or serial signal error. Short circuit between S2 and S3 of the outdoor terminal block. status Not illuminated Outside control P.C. Replace the electronic control P.C. board or the outside control P.C. When the AIR PURIFICATION light flashes 2 times. An abnormal discharge may occur due to a lot of dirt on the air purifier. Clean it up.
After cleaning, be sure to connect the air cleaning device after it is completely dry. If the AIR PURIFYING power operation check is performed with the wet air purification device, the protection is activated and also the AIR PURIFYING lamp flashes continuously. If it runs normally without turning off and on, the AIR PURIFYING lamp does not turn off.).
Be careful and never touch the air cleaner and the high voltage lead part. Operate and idle the ignition switch (air cleaner) using something like a screwdriver and measure the resistance between CN1R1 and the internal electronic control P.C. Does the ignition switch (air cleaner) work? Air cleaner) Does not work (close) using something like a screwdriver.
E Check of AIR PURIFYING power
While pressing both OPERATION SELECT. button and the TEMP + button on the remote at the same time, press the RESET button. Make sure the indicators on the LCD screen shown in the right figure are displayed. the set temperature is displayed). Action of the lock switch (air cleaner unit) due to incomplete closing of the front panel may cause 2-times flashing.
Is the voltage between CN1T1 (+) and (GND) on the electronic control P.C. board) 0V with the unit stopping.
F Electromagnetic noise enters into TV sets or radios
Indoor electronic control P.C. board
Receiver board (CN301)
Display board
Switch board
10-7. TEST POINT DIAGRAM AND VOLTAGE
Removing the panel
DISASSEMBLY INSTRUCTIONS11
DISASSEMBLY INSTRUCTIONS
OPERATING PROCEDURE PHOTOS
Removing the indoor electrical box
- Removing the nozzle assembly
- Removing the horizontal vane motor (1) Remove the nozzle assembly (Refer to 4.)
- Removing the air purifying device
- Removing the indoor fan motor, the indoor coil thermistor and the line flow fan
Removing the internal fan motor, internal coil thermistor and flow line fan thermistor and flow line fan. When attaching the in-line flow fan, screw the in-line flow fan so that there is a 4 mm gap between the right end of the in-line flow fan and the right wall of the air passage of the box (Figure 1).
Fixing the indoor coil thermistor
Holder shapeClip shape
Position and procedure for mounting the clip-shape part
