TOSHIBA CARRIER MMY-MUP1681HT6P-UL (01) PDF Document

When handling the TOSHIBA CARRIER MMY-MUP1681HT6P-UL outdoor unit, observe the following items:

1. When using a forklift truck or other machinery for loading/unloading in transportation, insert the fork of the forklift truck into the rectangular holes for handling as shown in the manual illustrations.

2. When lifting up the unit, insert a rope able to bear the unit’s weight into the rectangular holes for handling, and tie the unit from 4 sides.

3. Apply padding in positions where the rope comes into contact with the outdoor unit so that no damage is caused to the outer surface of the outdoor unit.

4. Note that there are reinforcing plates on the side surfaces, so the rope cannot be passed through those specific areas.

The additional amount of refrigerant charge for the TOSHIBA CARRIER MMY-MUP1681HT6P-UL is calculated using the following formula: Additional amount of refrigerant charge = [1] + [2] + [3] + [4].

[1] Compensation amount of refrigerant based on outdoor unit capacity type.

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

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

[4] Corrected amount of refrigerant based on outdoor unit diversity.

Standard liquid pipe additional amounts (Table 3):

The following tightening torques must be used for the TOSHIBA CARRIER MMY-MUP1681HT6P-UL:

The automatic address setup for the TOSHIBA CARRIER MMY-MUP1681HT6P-UL is performed as follows:

1. Turn on indoor units first, and then turn on outdoor units.

2. Wait about 1 minute after powering on. Confirm that the 7-segment display on the interface P.C. board of the header outdoor unit indicates “U.1. Err” and “L08” alternately at 1 second intervals.

3. Push SW06 for more than 1 second to start the automatic address setting. This may take up to 10 minutes (normally about 5 minutes).

4. The 7-segment display will indicate “Auto 1” to “Auto 2” to “Auto 3”.

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

6. Repeat these steps for other refrigerant lines as necessary.

The priority operation mode for the TOSHIBA CARRIER MMY-MUP1681HT6P-UL header unit is set using the outdoor unit function code (O.DN) [18]:

Note: The setting can be changed only when the system is at rest. Ensure the system is turned off prior to this operation.

When check code P10 is detected on the TOSHIBA CARRIER MMY-MUP1681HT6P-UL, follow these diagnostic steps:

1. Check if the float SW connector (Indoor control P.C. board CN30) is connected normally. If not, correct the connector connection.

2. If connected, check if the float SW operates. If the wiring is abnormal, check and correct the wiring.

3. If wiring is normal, check the indoor P.C. board. If it has failed, replace it.

4. Check if the drain pump operates. If not, check if power supply to the drain pump is normal (220V between pins 1-3 of CN504). If power is normal but it does not run, replace the drain pump.

5. If the pump operates, check for a trap in the drainage route or a clogged drain pipe. Improve the trap section or clear the clog as needed.

To clear outdoor unit check codes using the RBC-AMT* remote controller for the TOSHIBA CARRIER MMY-MUP1681HT6P-UL:

1. Change the mode to service monitor mode by pushing the CHECK and TEST buttons simultaneously for 4 seconds or more.

2. Using the TEMP buttons, set CODE No. to “FF”.

3. The display will count down from “0005” to “0000” in 5-second intervals. When the count reaches “0000”, the check code is cleared.

4. Push the TEST button to return to normal status.

To clear indoor unit check codes, push the ON/OFF button on the remote controller. This only clears codes for the indoor unit connected to that specific controller.

The resistance values for the TS1, TS3, TE1, TE2, TE3, TL1, TL2, TL3, and TO sensors on the TOSHIBA CARRIER MMY-MUP1681HT6P-UL are as follows:

To conduct a cooling test run on the TOSHIBA CARRIER MMY-MUP1681HT6P-UL using a wired remote controller:

1. Push the TEST button for 4 seconds or more. “TEST” will be displayed in the display section.

2. Push the ON/OFF button.

3. Using the Select Mode button, select the “COOL” operating mode. Note that temperature adjustment is unavailable during test operation.

4. After the test operation is finished, push the ON/OFF button to stop the unit.

5. Push the TEST button again to clear the test operating mode and return the unit to normal standby status.

Refrigerant recovery procedure A (when the unit can be energized) for the TOSHIBA CARRIER MMY-MUP1681HT6P-UL:

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

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

3. Set SW01/02/03 on the interface P.C. board of the failed unit to 2/11/1. When [rd] is displayed, push SW04 and hold for 5 seconds or more.

4. [rd] [FF] will be displayed, and reclaim operation will start. The troubled unit’s fan will turn ON, and its PMVs will open while the compressors remain OFF.

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 operation.

7. Turn off the power supply and recover any residual refrigerant using a recovery device.

To set up Night Operation for the TOSHIBA CARRIER MMY-MUP1681HT6P-UL using the RBC-AWSU** remote controller:

1. Push the Menu button.

2. Use the arrow buttons to select “6. Night operation” and push the Set button.

3. Select “1. Night operation” and choose “ON”.

4. Select “2. Start time” and “3. End time” to set the desired quiet period.

5. Pushing the Menu button will return you to the main screen. Note that cooling and heating performance may be slightly reduced during this period to maintain quietness.

To check the fan operation on a stopped TOSHIBA CARRIER MMY-MUP1681HT6P-UL outdoor unit:

1. Set the switches SW01/02/03 on the interface P.C. board to [2/1/4].

2. When [F. d] is displayed, push and hold SW04 for 2 seconds or more.

3. When [ 63 ] is displayed on the 7-segment display, the fan will start at maximum mode. Fans move synchronously in two-fan models.

4. You can change the fan speed by adjusting SW02 and SW03. For example, setting them to [1/7] will result in fan mode 15.

5. To clear this function, change SW01 to a different number or push SW05 for 2 seconds or more.

Note: Do not use this function while the compressor is operating, as it may cause damage.