TOSHIBA CARRIER MMY-MUP0961HT6P-UL (01) PDF Document

When undertaking specific work on the air conditioner, 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 following tools are either newly prepared or specifically required for use with R410A systems:

Gauge manifold: Required for vacuuming, charging refrigerant, and operation checks. Must be exclusive to R410A.

Charging hose: Must be exclusive to R410A.

Gas leak detector: Must be exclusive to R410A.

Refrigerant recovery device: Must be exclusive to R410A.

Torque wrench: Exclusive to 12.7mm and 15.9mm diameters.

Refrigerant canister: Must be exclusive to R410A and include the refrigerant name for identification.

Vacuum pump: Can be used if a counter-flow preventive adapter is attached.

A test operation should be carried out following these steps:

Step 1. Checks before test operation: Verify basic installation items and check results in the provided checklists.

Step 2. Main power check: Turn on the power and ensure the refrigerant circuit system is turned on normally.

Step 3. Address setup: Start the address setup for the outdoor and indoor units. Operation will not start by simply powering on.

Step 4. Communication method setup: Set the communication method. This must not be performed before the indoor unit address setup.

Step 5. Fan Mode: Carry out the Fan mode check to see if air is blowing out of the indoor unit.

Step 6. Test operation: Execute the test operation and check air blowing and cooling/heating performance in the indoor unit.

Open the access door cover and follow these steps to set the address automatically:

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

2. Wait approximately 1 minute after powering on and confirm the 7-segment display on the interface P.C. board of the header unit indicates “U.1. Err” and “L08” alternately.

3. Push SW06 for more than 1 second to start the automatic address setting. This may take up to 10 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. – – -” (flashing) or “U.1. – – -” (lighted).

The following table lists check codes and their descriptions for indoor units:

The oil level judgment results can be accessed by setting the rotary switches on the interface P.C. board to SW01=1, SW02=16, SW03=1. The displayed digits indicate the following:

0: Normal. The amount of oil in the compressor is sufficient.

1 or 2: Low level. The amount of oil in the compressor is insufficient. If this persists, the system will perform a protective shutdown.

Example display [oL] [0 2 …]: Oil level is low for compressor 2 and normal for compressor 1.

Resistance should be measured at 68 degrees Fahrenheit (20 degrees Celsius). The ratings are as follows:

Compressor (Model LA771A3TB-20M): 0.242 ohms +/- 0.012 for Red to White, White to Black, and Black to Red.

Fan Motor (Model ICF-620A1000-1): 10.38 ohms +/- 1.04 for Red to White, White to Black, and Black to Red.

PMV Coil (Model PQ-M10012 / UKV-A376): 46 ohms +/- 4 for Black, Yellow, Red, or Orange to Gray (COM).

4-way Valve Coil (Model SQ-A2522G): 1707 ohms +/- 10%.

2-way Valve Coil (Model FQ-A0520D): 1830 ohms +/- 10%.

Night Operation (sound reduction control) reduces the sound of the outdoor unit by putting priority on quietness. To set this using a wired remote controller (RBC-AWSU**):

1. Push the Menu button and select “6. Night operation”.

2. Select “1. Night operation” and set it to “ON”.

3. Select “2. Start time” and “3. End time” to define the operation period.

Note that cooling and heating performance may be reduced during this time. For the MMY-MUP0961HT6P-UL, the capacity is reduced to approximately 70% in both cooling and heating modes when active.

Refrigerant can be recovered from a troubled unit using a normal outdoor unit in the system. If the troubled unit can be energized (Procedure A):

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

2. Fully close the liquid pipe service valve of the troubled unit.

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

4. “[rd] [FF]” will be displayed, and reclaim operation will start. Normal units will operate in test cooling mode.

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

6. Push SW05 to finish the operation and turn off the power supply to recover residual gas with a recovery device.

The additional refrigerant charge is calculated using the following formula: Additional charge = [1] + [2] + [3] + [4].

[1] Compensation amount based on outdoor unit capacity. For model 096, the compensation is 2.64 lbs (1.20 kg).

[2] Additional charge based on liquid pipe size (Real length x Table value). Table values for liquid pipes are:

1/4 inch: 0.017 lbs/ft

3/8 inch: 0.037 lbs/ft

1/2 inch: 0.071 lbs/ft

5/8 inch: 0.108 lbs/ft

3/4 inch: 0.168 lbs/ft

7/8 inch: 0.235 lbs/ft

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

[4] Corrected amount based on outdoor unit diversity (e.g., if diversity is 95% or higher, the correction is 0 lbs).