User manual MITSUBISHI SEZ-KD25VAL INSTALLATION INSTRUCTIONS

[. . . ] WIRING DIAGRAM ·····························19 5. REFRIGERANT SYSTEM DIAGRAM·······20 6. TROUBLESHOOTING·························21 7. DISASSEMBLY PROCEDURE ···········33 Model name indication INDOOR UNIT ON/OFF TEMP TEMP. ON/OFF WIRED REMOTE CONTROLLER (For SEZ-KD·VA model ) WIRELESS REMOTE CONTROLLER (For SEZ-KD·VAL model ) 1 PART NAMES AND FUNCTIONS Indoor Unit SEZ-KD25VALL(L). TH SEZ-KD35VA(L). TH SEZ-KD50VA(L). TH SEZ-KD60VA(L). TH SEZ-KD71VA(L). TH Air outlet Air outlet duct flange Air inlet Wired remote controller Once the controls are set, the same operation mode can be repeated by simply pressing the ON/OFF button. q Operation buttons Set Temperature buttons Down Up Timer Menu button (Monitor/Set button) Mode button (Return button) Start/Stop button Fan Speed button Filter button (<return sign> button) Test Run button Service button (Clear button) MENU BACK PAR-21MAA TEMP. Set Time buttons Back Ahead Timer On/Off button (Set Day button) ON/OFF DAY ON/OFF FILTER MONITOR/SET CHECK TEST Airflow Up/Down button CLOCK OPERATION CLEAR Louver button ( Operation button) To preceding operation number Opening the door Ventilation button Operation button) ( To next operation number 2 q Display "Sensor" indication Day-of-Week For purposes of this explanation, all parts of the display are shown as lit. [. . . ] (Correct operation) 23 For description of each LED (LED1, 2, 3) provided on the indoor controller, refer to the following table. LED 1 (power for microcomputer) LED 2 (power for remote controller) LED 3 (communication between indoor and outdoor units) Indicates whether control power is supplied. This LED lights only in the case of the indoor unit which is connected to the outdoor unit refrigerant address "0". Indicates state of communication between the indoor and outdoor units. Make sure that this LED is always blinking. AUTO RESTART FUNCTION Indoor controller board This model is equipped with the AUTO RESTART FUNCTION. When the indoor unit is controlled with the remote controller, the operation mode, set temperature, and the fan speed are memorized by the indoor controller board. The auto restart function sets to work the moment the power has restored after power failure, then, the unit will restart automatically. SELF-DIAGNOSIS ACTION TABLE Error Code Abnormal point and detection method Room temperature thermistor (TH1) 1 The unit is in three-minute resume prevention mode if short/open of thermistor is detected. (The unit returns to normal operation, if it has normally reset. ) 2 Constantly detected during cooling, drying and heating operation Short: 90: or more Open: -40: or less Note: Refer to the manual of outdoor unit for the details of display such as F, U, and other E. 0: ······15. 0k" 10: ····9. 6k" 20: ····6. 3k" 30: ····4. 3k" 40: ····3. 0k" If you put force on (draw or bend) the lead wire with measuring resistance value of thermistor breaking of wire or contact failure can be detected. 2 Check contact failure of connector (CN20) on the indoor controller board. 2 Overheating protection (Heating mode) The units is in six-minute resume prevention mode if pipe <Liquid or condenser / evaporator> temperature is detected as over 70: after the compressor started. Abnormal if the temperature of over 70: is detected again within 10 minutes after six-minute resume prevention mode. Cause (Cooling or drying mode) 1 Clogged filter (reduced airflow) 2 Short cycle of air path 3 Low-load (low temperature) operation beyond the tolerance range 4 Defective indoor fan motor · Fan motor is defective. · Indoor controller board is defective. Countermeasure (Cooling or drying mode) 1 Check clogging of the filter. DC Fan motor (FAN MOTOR/ INDOOR CONTROLLER BOARD) 5 Defective outdoor fan control 6 Overcharge of refrigerant 7 Defective refrigerant circuit (clogs) (Heating mode) 1 Clogged filter (reduced airflow) 2 Short cycle of air path 3 Over-load (high temperature) operation beyond the tolerance range 4 Defective indoor fan motor · Fan motor is defective. · Indoor controller board is defective. 5 Check outdoor fan motor. 67 Check operating condition of refrigerant circuit. P6 (Heating mode) 1 Check clogs of the filter. DC Fan motor (FAN MOTOR/ INDOOR CONTROLLER BOARD) 5 Defective outdoor fan control 6 Overcharge of refrigerant 7 Defective refrigerant circuit (clogs) 8 Bypass circuit of outdoor unit is defective. 5 Check outdoor fan motor. 6~8Check operating condition of refrigerant circuit. P8 Pipe temperature 1 Slight temperature difference <Cooling mode> between indoor room Detected as abnormal when the pipe temtemperature and pipe <liquid perature is not in the cooling range 3 minor condenser / evaporator> utes after compressor start and 6 minutes temperature thermistor after the liquid or condenser/evaporator pipe · Shortage of refrigerant is out of cooling range. · Disconnected holder of pipe Note 1) It takes at least 9 minutes. evaporator> thermistor Note 2) Abnormality P8 is not detected in · Defective refrigerant circuit drying mode. 2 Converse connection of Cooling range : -3 deg ] (TH-TH1) extension pipe (on plural units TH: Lower temperature between: liquid connection) pipe temperature (TH2) and con3 Converse wiring of indoor/ denser/evaporator temperature (TH5) outdoor unit connecting wire TH1: Intake temperature (on plural units connection) 4 Defective detection of indoor <Heating mode> room temperature and pipe When 10 seconds have passed after the <condenser / evaporator> compressor starts operation and the hot temperature thermistor adjustment mode has finished, the unit is 5 Stop valve is not opened detected as abnormal when completely. [. . . ] No Wiring contact check Contact of fan motor connector (CNMF) Yes Yes Replace indoor controller board (I. B). Replace fan motor (MF). Replace drain pump (DP). Is there no contact failure?Yes Power supply check (Remove the connector (CNMF)) Measure the voltage in the indoor controller circuit board. TEST POINT 1 : VDC (between 1 (+) and 4 (-) of the fan connector): VDC DC310~340V TEST POINT 2 : VCC (between 5 (+) and 4 (-) of the fan connector): VCC DC15V No Wiring recovery Is the voltage normal? No Yes Replace the fan motor. Yes Check the operation of fan. [. . . ]