TOSHIBA CARRIER MMY-MUP120H1HT6PUL (01) PDF Document

When performing various tasks on the TOSHIBA CARRIER MMY-MUP120H1HT6PUL, the following protective gear must be worn to prevent injury, burns, or electric shocks:

All types of work: Protective gloves and safety working clothing.

Electrical-related work: Gloves to provide protection for electricians, insulating shoes, and clothing to provide protection from electric shock.

Work done at heights (50 cm or more): Helmets for use in industry.

Transportation of heavy objects: Shoes with additional protective toecap.

Repair of outdoor unit: Gloves to provide protection for electricians.

The TOSHIBA CARRIER MMY-MUP120H1HT6PUL is a High Heat model classified under Model Type C with the following specifications:

Model	X in (mm)	Y in (mm)	Z in (mm)	Weight Lbs (Kg)
TOSHIBA CARRIER MMY-MUP120H1HT6PUL	26.7 (677)	13.2 (335)	31.1 (790)	754.0 (342)

The following tightening torques must be applied when securing terminals and screws on the TOSHIBA CARRIER MMY-MUP120H1HT6PUL:

Terminal Type	Screw Size	Tightening torque ft.lbs (N.m)
Power supply terminal	M6	1.84 to 2.2 (2.5 to 3.0)
Earth screw	M8	4.06 to 4.87 (5.5 to 6.6)
Communication wire terminal	M4	0.89 to 1.03 (1.2 to 1.4)

The additional amount of refrigerant charge for the TOSHIBA CARRIER MMY-MUP120H1HT6PUL is determined using the following formula:

Additional amount of refrigerant charge = [1] + [2] + [3] + [4]

[1] Compensation amount based on outdoor unit capacity type (For the 120 model, this is 3.30 lbs or 1.50 kg).

[2] Additional amount based on liquid pipe size (Real length of liquid pipe multiplied by the additional charge per foot based on diameter).

[3] Additional amount based on indoor unit capacity type.

[4] Corrected amount based on outdoor unit diversity.

To set the function codes for the TOSHIBA CARRIER MMY-MUP120H1HT6PUL, follow these steps using the interface P.C. board switches:

1. Set the rotary switches on the interface P.C. board to SW01= [9], SW02= [1], and SW03= [1]. The display should show “d n.S E t”.

2. Push SW04. The 7-segment display switches to “d n.0 0 1”.

3. Use SW05 or SW06 to change the outdoor unit code number (O.DN).

4. Push SW04 again. The display will blink “d.* * * *” and show the current setting data.

5. Use SW05 or SW06 to change the setting data.

6. Push and hold SW04 for more than 2 seconds. When the flashing stops and the display remains lit, the setting is complete.

7. Set the rotary switches back to SW01= [1], SW02= [1], and SW03= [1].

8. Reset the power of the outdoor unit by turning it off for at least one minute.

To check the fan operation of the TOSHIBA CARRIER MMY-MUP120H1HT6PUL, follow this procedure:

1. Push the Start/Stop button on the remote controller.

2. Select the “Fan” operating mode.

3. Verify if air is discharged from the discharge port of the indoor unit. If no, check the indoor fan, fan motor, and fan circuit.

4. Check if the operating sound is normal. If no, check the area around the fan for obstructions.

5. If a check code appears on the remote controller, refer to the check code list for troubleshooting.

The priority operation mode for the TOSHIBA CARRIER MMY-MUP120H1HT6PUL can be adjusted via O.DN [18] with the following options:

Setting	Operation Mode
O.DN [18] = 0000	Priority heating (factory default)
O.DN [18] = 0001	Priority cooling
O.DN [18] = 0002	Priority operation based on number of units in operation (mode with largest share)
O.DN [18] = 0003	Priority indoor unit (priority given to the mode of a specific designated unit)

To initiate automatic address setup for the TOSHIBA CARRIER MMY-MUP120H1HT6PUL, follow these steps:

1. Turn on the indoor units first, followed by the outdoor units.

2. Wait approximately one minute and confirm the 7-segment display on the header unit indicates “U. 1. Err” and “L08” alternately.

3. Push SW06 on the interface P.C. board for more than 1 second. The setup can take up to 10 minutes (typically 5 minutes).

4. The display will cycle through “Auto 1”, “Auto 2”, and “Auto 3”.

5. The setting is complete when the display changes to “U. 1. – – -” (flashing or lit).

Check code L08 on the TOSHIBA CARRIER MMY-MUP120H1HT6PUL indicates that the indoor group address is not set or there is an address setup trouble.

Countermeasures include:

1. Checking if the header outdoor unit power is on.

2. Setting up the addresses again.

3. Ensuring that the outdoor line address and the line addresses of all indoor units match.

4. Checking for duplication of indoor addresses.

To check the inverter output for the TOSHIBA CARRIER MMY-MUP120H1HT6PUL:

1. Turn off the power supply.

2. Remove the compressor leads from the compressor P.C. board.

3. Turn on the power supply and start a cooling or heating test operation.

4. Measure the output voltage across the following leads; the criterion for all is 240-400V:

Measured Leads	Criterion
CN201 – CN202	240-400V
CN202 – CN203	240-400V
CN203 – CN201	240-400V

5. If the result is unsatisfactory, the compressor P.C. board must be replaced.

When a TOSHIBA CARRIER MMY-MUP120H1HT6PUL unit is troubled but can be energized, use the following reclaim procedure:

1. Connect the liquid pipe check joint and the low pressure-side check joint using a charge hose and purge the hose of air.

2. Fully close the liquid pipe service valve of the troubled unit, leaving the gas pipe service valves fully open.

3. Set SW01/02/03 on the interface P.C. board of the failed unit to 2/11/1. The display will show “rd”.

4. Push and hold SW04 for at least 5 seconds. The display will show “rd FF”, and reclaim will start.

5. After approximately 20 minutes, fully close the gas pipe service valve of the troubled unit.

6. Push SW05 on the interface board to finish the reclaim operation.

7. Turn off the power and recover residual gas using a recovery device.

If the TOSHIBA CARRIER MMY-MUP120H1HT6PUL displays check code P04, follow these diagnostic checks:

1. Verify if the high-pressure switch (63H1) is operating and if the circuit cabling is normal.

2. Ensure service valves are fully opened.

3. Check characteristics of the high-pressure sensor (Pd) for accuracy.

4. Check if the outdoor fan is operating normally and inspect for fan cracks or detachment.

5. Check for obstructions or air short circuits in the outdoor unit heat exchanger.

6. Inspect outdoor PMVs for clogging and ensure SV4 circuits are normal.

7. Check for refrigerant overcharge or piping deformities.