User manual MITSUBISHI MSC-A12YV SERVICE MANUAL

[. . . ] SPLIT-TYPE, AIR CONDITIONERS SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS HFC utilized No. OB329 SERVICE MANUAL Wireless type Models R410A MSC-A07YV MSC-A09YV MSC-A12YV - E1 (WH) (WH) (WH) E1 E1 CONTENTS 1. TECHNICAL CHANGES ····································3 2. PART NAMES AND FUNCTIONS······················3 3. [. . . ] In the test run or emergency operation, the horizontal vane operates in VANE AUTO ( ) mode. Emergency operation continues until the EMERGENCY OPERATION switch is pressed once again (MU-A07/A09/A12YV, MUX-A10/A19/A20/A22/A25/A26WV)/once or twice (MUH-A07/A09/A12YV, MXZ-A18/A26/A32WV) or the unit receives any signal from the remote controller. NOTE : Do not press the EMERGENCY OPERATION switch during normal operation. · The following indication does not depend on the shape of lamp. OPERATION INDICATOR lamp Press once <Cool> Press again <Heat> Press once again <Stop> EMERGENCY OPERATION switch w Heat is available only in MUH-A07/A09/A12YV and MXZ-A18/A26/A32WV. 16 9 SERVICE FUNCTIONS MSC-A07YV - E1 MSC-A09YV - E1 MSC-A12YV - E1 9-1. TIMER SHORT MODE For service, set time can be shortened by short circuit of JPG and JPS the electronic control P. C. (Refer to page 25. ) Set time : 1 minute 1-second Set time : 3 minutes 3-second (It takes 3 minutes for the compressor to start operation. However, the starting time is shortened by short circuit of JPG and JPS. ) 9-2. BOARD MODIFICATION FOR INDIVIDUAL OPERATION A maximum of 4 indoor units with wireless remote controllers can be used in a room. In this case, to operate each indoor unit individually by each remote controller, P. C. boards of remote controller must be modified according to the number of the indoor unit. The board has a print as shown below : Remote controller model : KP1A J2 J1 Remote controller model : KG3A J2 NOTE : 1. For remodelling, take out the batteries and press the OPERATE/STOP(ON/OFF) button twice or 3 times at first. After finish remodelling, put back the batteries then press the RESET button. Remote controller model KP1A and KG3A are the same in terms of specification. J1 The P. C. Solder "J1" and "J2" according to the number of indoor unit as shown in Table 1. 4 unit 1 unit operation No modification ­ ­ ­ 2 units operation Same as at left Solder J1 ­ ­ 3 units operation Same as at left Same as at left Solder J2 ­ 4 units operation Same as at left Same as at left Same as at left Solder both J1 and J2 How to set the remote controller exclusively for particular indoor unit After you turn the breaker ON, the first remote controller that sends the signal to the indoor unit will be regarded as the remote controller for the indoor unit. The indoor unit will only accepts the signal from the remote controller that has been assigned to the indoor unit once they are set. The setting will be cancelled if the breaker has turned off, or the power supply has shut down. Please conduct the above setting once again after the power has restored. 17 9-3. REMOTE CONTROLLER (How to set the type) This remote controller setting needs to be switched according to the type of air conditioner (COOL & HEAT or COOL ONLY). If the setting is incorrect, the air conditioner does not operate normally. [. . . ] Removing the electrical box (1) (2) (3) (4) (5) (6) (7) Remove the front panel. (Refer to 2. ) Disconnect the connector of the indoor coil thermistor (CN112), the fan motor connector (CN211 and CN121) and the vane motor connector (CN151) on the electronic control P. C. (8) Remove the fan motor lead wire and indoor coil thermistor from the electrical box. (9) Remove the lead wire of vane motor from the bottom of electrical box. [. . . ]