After stopping the operation of the air conditioner, turn off the power supply switch and remove the power plug. When repairing or inspecting the circuit must be done without turning off the power, take great care not to touch live parts. The correct coolant is specified in the manuals and on the specification labels supplied with our products.
Connecting these models to the MUZ-EF·VE(H) series outdoor units enables low standby power management. These models can be connected to the MUZ-EF·VE(H) series after they are once connected to the MXZ series and operated, for example, due to relocation. In that case, the MUZ-EF·VE(H) series outdoor units will not work without taking a step.
NOTE: To change, remove the batteries and first press the OPERATE/STOP (ON/OFF) button 2 or 3 times. When you turn on the circuit breaker, the first remote controller that sends a signal to the indoor unit will be treated as the indoor unit remote controller. The indoor unit will only accept the remote control signal assigned to the indoor unit when they are set up.
The setting will be canceled if the breaker is turned OFF, or the power supply is turned off.
8-3. AUTO RESTART FUNCTION
Operation
NOTE
WIRELESS REMOTE CONTROLLER
MICROPROCESSOR CONTROL9
INDOOR UNIT DISPLAY SECTION
9-1. COOL ( ) OPERATION
Coil frost prevention
Low outside temperature operation
Indoor fan speed control
9-2. DRY ( ) OPERATION
9-4. HEAT ( ) OPERATION
- Cold air prevention control
- High pressure protection
- Defrosting
- To release the timer
Multisystem air conditioners can connect two or more indoor units with one outdoor unit. When you try to operate two or more indoor units with an outdoor unit simultaneously, one for cooling and the others 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 the indoor unit starts to operate while the outdoor unit is defrosting, it takes a few minutes (max. 10 minutes) to blow out the warm air. Confirmation of the 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 of the vanes to create the optimum 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. To cancel this action, select another mode or press one of the following buttons in ECONO COOL mode:. In the following cases, the horizontal vane returns to the closed position. a) When the OPERATE/STOP (ON/OFF) (POWER OFF) button is pressed.
During COOL or DRY with the blade angle at angle 4 or 5 when the cumulative running time of the compressor exceeds 1 hour, the blade angle automatically changes to angle 1 to prevent dew. Initially, "0:00" flashes at the current time display of TIME MONITOR, so set the current time correctly with the CLOCK SET button. Set the current time (a) Press the CLOCK set button. b) Press the TIME SET ( and ) buttons to set the current time.
Each time the FORWARD ( ) button is pressed, the set time increases by 1 minute, and each time the BACKWARD ( ) button is pressed, the set time decreases by 1 minute. Set the timer time using the TIME SET ( and ) buttons. a) Press the OFF TIMER button ( ) during operation. Each time the FORWARD ( ) button is pressed, the set time increases by 10 minutes: each time the BACKWARD ( ) button is pressed, the set time decreases by 10 minutes.
PROGRAM TIMER
9-8. WEEKLY TIMER OPERATION
- How to set the weekly timer
- Checking weekly timer setting Checking weekly timer setting
- How to set i-save operation
- Take care of the following during servicing
- Troubleshooting procedure
- How to replace batteries
When the weekly timer is ON, the day of the week whose timer setting is complete is lit. When all days of the week are selected to view the settings, and another setting is included among them, will be displayed. Emergency operation is available when the remote control is missing, faulty, or the remote control batteries are exhausted.
The indoor fan is running at high speed and the temperature control is not working. In the test run or emergency operation, the horizontal vane operates in VANE AUTO mode ( ). Emergency operation continues until the EMERGENCY OPERATION button is pressed once or twice or the unit receives a signal from the remote control.
When the system goes off, the compressor will not restart for 3 minutes, as the 3-minute time delay works to protect the compressor from overload.
TROUBLESHOOTING10
10-2. FAILURE MODE RECALL FUNCTION Outline of the function
Flow chart of failure mode recall function for the indoor/outdoor unit
Indoor unit failure mode table The left lamp of
10-3. INSTRUCTION OF TROUBLESHOOTING
10-4. TROUBLESHOOTING CHECK TABLE
The operation mode of each indoor unit is set differently to COOL (including DRY) and HEAT at the same time, the operation mode of the indoor unit that has 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-EF Type
Is there faulty wiring, poor contact or disconnection of the internal/external connecting wire. No (lit or not lit). board or an external electronic controller P.C. Pay attention to the residual voltage of the smoothing capacitor. Is there an amplitude of 10 to 20 VDC between the internal terminal block S2 and S3. lt;Serial signal confirmation>.
If there is an error in the indoor/outdoor connection cable:. such as wire damage, interconnection and/or poor contact with the terminal block, replace the indoor/.
E Electromagnetic noise enters into TV sets or radios
Indoor electronic control P.C. board
Receiver board
Display board
Switch board
10-7. TEST POINT DIAGRAM AND VOLTAGE
Removing the panel
DISASSEMBLY INSTRUCTIONS11
OPERATING PROCEDURE PHOTOS
Remove the indoor electrical box
Removing the nozzle assembly
Removing the horizontal vane motor (1) Remove the nozzle assembly (Refer to 4.)
Removing the indoor fan motor, the indoor coil thermistor and the line flow fan
