Capacity Range: 6 to 0 Ton Nominal




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HVAC Guide Specifications

Ductless Mini-Splits MXZ

Section 15700 – Mechanical HVAC

Capacity Range: 1.6 to 3.0 Ton Nominal


Mitsubishi Model Number: MXZ-A (wall-mount) multi split inverter heat pump series.

Variable capacity multi-zone System: MXZ2A20NA One or two zones

MXZ3A30NA Two or three zones

MXZ4A36NA Three or four zones

Part 1 – General


    1. System Description:

  1. The heat pump air conditioning system shall be a Mitsubishi Electric MXZ-A variable capacity multi-zone series. The system shall consist of two (2), three (3), or four (4) slim silhouette, compact, wall mounted indoor fan coil sections with digital wireless remote controller and a slim silhouette horizontal discharge outdoor unit which shall be of an inverter driven heat pump design.

  2. Indoor unit model numbers may be MSZA09NA, MSZA12NA, MSZA15NA, MSZA17NA and MSZA24NA. Outdoor unit model numbers may be MXZ2A20NA (1:1 or 2:1), MXZ3A30NA (2:1 or 3:1), and MXZ4A36NA (3:1 or 4:1) multi-zone systems.

    1. Quality Assurance:

  1. The system components shall be tested by a Nationally Recognized Testing Laboratory (NRTL) and shall bear the ETL label.

  2. All wiring shall be in accordance with the National Electrical Code (N.E.C.).

  3. The units shall be rated in accordance with Air-conditioning Refrigeration Institute’s (ARI) Standard 210 / 240 and bear the ARI Certification label.

  4. The units shall be manufactured in a facility registered to ISO 9001 and ISO 14001, which is a set of standards applying to product and manufacturing quality and environmental management and protection set by the International Standard Organization (ISO).

  5. A dry air holding charge shall be provided in the indoor section.

  6. System efficiency shall meet or exceed 13 SEER when part of a multi system (2:1 / 3:1 / 4:1) .

    1. Delivery, Storage and Handling

  1. Unit shall be stored inside and carefully handled according to the manufacturer’s recommendations.

  2. The wireless remote controller shall be shipped inside the carton and packaged with the indoor unit and shall be able to withstand 105°F storage temperatures and 95% relative humidity without adverse effect.



Part 2 – Warranty


    1. The units shall have a manufacturer’s parts and defects warranty for a period one (1) year from date of installation. The compressor shall have an extended warranty of 6 years from date of installation. If, during this period, any part should fail to function properly due to defects in workmanship or material, it shall be replaced or repaired at the discretion of the manufacturer. This warranty will not include labor.

    2. Manufacturer shall have over 25 years of continuous experience in the U.S. market.



Part 3 – Performance


    1. Each system shall perform in accordance with the ratings shown in the tables below.

    2. Cooling performance shall be based on 80°F DB, 67°F WB (26.7°C DB, 19.4°C WB) for the indoor unit and 95°F DB, 75°F WB (35°C DB, 23.9°C WB) for the outdoor unit at rated frequency: A09-50Hz, A12-76Hz, A15-77Hz, A17-79Hz, A24-110Hz.

    3. Heating performance shall be based on 70ºF DB, 60 ºF WB (21.1ºC DB, 15.6ºC WB) for the indoor unit and 47 º F DB, 43º F WB (8.3 º C DB, 6.1º C WB) for the outdoor unit at rated frequency: A09-61Hz, A12-76Hz, A15-78Hz, A17-88Hz, A24-101Hz.

    4. Multi-Zone Product Tables:

      1. MXZ-2A20NA [Minimum of one indoor unit must be installed]




Indoor Units

Cooling Capacity (Btu/h)

Heating Capacity (Btu/h)

Unit A

Unit B

Unit C

Total

Unit A

Unit B

Unit C

Total

09

9,000







9,000

10,900







10,900

12

12,000







12,000

13,600







13,600

15

15,000







15,000

18,000







18,000

09+09

9,000

9,000




18,000

10,900

10,900




21,800

09+12

8,500

11,500




20,000

9,500

12,500




22,000

09+15

7,500

12,500




20,000

8,250

13,750




22,000

12+12

10,000

10,000




20,000

11,000

11,000




22,000


3.04.2 MXZ-3A30NA [Minimum of two indoor units must be installed]


Indoor Units

Cooling Capacity (Btu/h)

Heating Capacity (Btu/h)

Unit A

Unit B

Unit C

Total

Unit A

Unit B

Unit C

Total

09+09

9,000

9,000




18,000

10,900

10,900




21,800

09+12

9,000

12,000




21,000

10,900

13,600




24,500

09+15

9,000

15,000




24,000

10,100

16,900




27,000

09+17

9,000

16,200




25,200

9,300

17,700




27,000

09+24

7,600

20,400




28,000

7,300

19,700




27,000

12+12

12,000

12,000




24,000

13,500

13,500




27,000

12+15

11,500

14,500




26,000

12,000

15,000




27,000

12+17

10,800

15,200




26,000

11,200

15,800




27,000

15+15

13,000

13,000




26,000

13,500

13,500




27,000

15+17

12,200

13,800




26,000

12,700

14,300




27,000

17+17

13,000

13,000




26,000

13,500

13,500




27,000

09+09+09

9,000

9,000

9,000

27,000

9,500

9,500

9,500

28,500

09+09+12

8,500

8,500

11,400

28,400

8,600

8,600

11,400

28,600

09+09+15

7,750

7,750

12,900

28,400

7,800

7,800

13,000

28,600

09+09+17

7,300

7,300

13,800

28,400

7,350

7,350

13,900

28,600

09+12+12

7,300

10,550

10,550

28,400

7,200

10,700

10,700

28,600



3.04.03 MXZ-4A36NA [Minimum of three indoor units must be installed]


Indoor Units

Cooling Capacity (Btu/h)

Heating Capacity (Btu/h)

Unit A

Unit B

Unit C

Unit D

Total

Unit A

Unit B

Unit C

Unit D

Total

09+09+09

9,000

9,000

9,000




27,000

10,800

10,800

10,800




32,400

09+09+12

9,000

9,000

12,000




30,000

10,000

10,000

12,400




32,400

09+09+15

8,800

8,800

14,500




32,100

8,900

8.900

14,600




32,400

09+09+17

8,200

8,200

15,700




32,100

8,400

8,400

15,600




32,400

09+09+24

6,900

6,900

18,300




32,100

7,800

7,800

16,800




32,400

09+12+12

8,700

11,700

11,700




32,100

9,400

11,500

11,500




32,400

09+12+15

8,000

10,700

13,400




32,100

8,300

10,400

13,700




32,400

09+12+17

7,600

10,100

14,400




32,100

7,900

9,900

14,600




32,400

09+15+15

7,500

12,300

12,300




32,100

7,600

12,400

12,400




32,400

09+15+17

7,100

11,700

13,300




32,100

7,200

11,900

13,300




32,400

09+17+17

6,700

12,700

12,700




32,100

7,000

12,700

12,700




32,400

12+12+12

10.700

10,700

10,700




32,100

10,800

10,800

10,800




32,400

12+12+15

9,900

9,900

12,300




32,100

9,700

9,700

13,000




32,400

12+12+17

9,400

9,400

13,300




32,100

9,300

9,300

13,800




32,400

12+15+15

9,100

11,500

11,500




32,100

9,000

11,700

11,700




32,400

09+09+09+09

9,000

9,000

9,000

9,000

36,000

9,000

9,000

9,000

9,000

36,000

09+09+09+12

8,300

8,300

8,300

11,100

36,000

8,300

8,300

8,300

11,100

36,000

09+09+09+15

7,700

7,700

7,700

12,900

36,000

7,700

7,700

7,700

12,900

36,000

09+09+12+12

7,700

7,700

10,300

10,300

36,000

7,700

7,700

10,300

10,300

36,000

Part 4 – Products


    1. Indoor Unit

  1. General:

The indoor unit shall be fully factory assembled, wired and run tested prior to shipment. Contained within the indoor unit shall be all factory wiring, piping, control circuit board, fan, and fan motor. The unit shall have a self-diagnostic function, 3-minute restart time delay mechanism, an auto restart function, an emergency / test operation. Indoor unit shall be charged with dry air before shipment from factory.

  1. Unit Cabinet:

    1. The casing shall have a white finish.

    2. Multi directional drain and refrigerant piping, offering three (3) direction pipe alignment for all refrigerant piping and two (2) direction pipe alignment for condensate draining shall be standard.

    3. There shall be a separate back plate that secures the indoor unit firmly to the wall.

  2. Fan:

1. The indoor unit fan shall be an assembly with a line-flow fan direct driven by a single motor.

2. The fan shall be statically and dynamically balanced and run on a motor with permanently lubricated bearing.

3. A manual adjustable guide vane shall be provided with the ability to change the horizontal airflow from side to side (left to right).

4. A integral, motorized, multi-position, vertical air sweep flow louver shall provide for uniform air distribution. Louver position shall be selectable from the remote controller

5. The indoor fan motor shall be capable of three (3) speed operation: High, Medium and Low.

D. Filter:

1. Return air shall be filtered by means of an easily removed, washable, Catechin, Antioxidant Pre-filter and a separate Anti-allergy enzyme filter – blue bellows type.

E. Coil:

1. The indoor unit coil shall be of nonferrous construction with smooth plate fins on copper tubing.

2. The refrigerant tubing shall have inner groves for high efficiency heat exchange.

3. All tube joints shall be brazed with phoscopper or silver alloy.

4. The coils shall be pressure tested at the factory.

5. A condensate pan and drain shall be provided under the coil.

F. Electrical:

1. The indoor unit electrical power shall be 208 / 230 volts, 1-phase, 60 hertz.

2. The system shall be equipped with A-Control – a system allowing each indoor unit to be powered and controlled directly from the outdoor unit using a 14 gauge (AWG) 3-wire connection plus ground providing both primary power and integrated , by-directional, digital control signal without additional connections.

3. The indoor units shall not have any supplemental or “back-up” electrical heating elements.
G. Control:

1. Each indoor unit shall be provided with a digital, wireless, remote controller to perform all input functions necessary to operate the system.

2. [OPTION] The indoor unit shall have the option of a field installed hard-wired digital remote controller.

3. The remote controller shall provide a Power On/Off switch, Mode Selector – Cool-Dry-Heat, Temperature Setting, 24 Hour Clock / Timer Control, Fan Speed Select and Auto Vane selector.

4. Operating mode for all units in the multi-zone system shall be determined by the first indoor unit to request Heat or Cool function.

5. The indoor unit shall perform Self-diagnostic Function and be equipped with Test Run switching and Check Mode switching.

6. Temperature changes shall be by 1ºF increments with a range of 61-88ºF.

7. The microprocessor located in the indoor unit shall have the capability of sensing return air temperature and indoor coil temperature, receiving and processing commands from the wireless or wired digital remote controller, providing emergency operation and controlling the outdoor unit.

8. The indoor units shall be capable of working with both single-zone or multi-zone outdoor units

8. The system shall be capable of automatically restarting, at all previous settings, when the power is restored after power interruption.

9. The digital remote controller shall control the operation of the motorized, vertical, air sweep louver for Auto (position determined by control program), Manual (four controller selectable positions) or Sweep (continuous motion). The louver shall drive to the closed position when the indoor unit is turned off.


    1. Outdoor Units:

General:

The MXZ outdoor units shall be specifically designed to work with the MSZ family of indoor units. The units must have a fused powder coated finish in a Munsell 5Y 8/1 color. The outdoor unit shall be completely factory assembled, piped and wired. Each unit shall be run tested at the factory prior to shipment.

A. Unit Cabinet:

1. All casing and cabinet components shall be fabricated of galvanized steel, bonderized finished with an electrostatically applied, thermally fused acrylic or polyester powder coating for durable, corrosion resistant surface protection.

B. Fan:

1. The unit shall be furnished with a direct drive, high performance propeller type fan.

2. The condenser fan motor shall be a variable speed, direct current (DC) motor and shall have permanently lubricated bearings.

3. Fan speed shall be switch automatically according to the number of operating indoor units and the compressor operating frequency.

4. The fan motor shall be mounted with vibration isolation for quiet operation.

5. The fan shall be provided with a raised guard to prevent contact with moving parts.

6. The outdoor unit shall have horizontal discharge airflow.

C. Coil:

1. The outdoor unit coil shall be of nonferrous construction with lanced or corrugated plate fins on copper tubing.

2. The coil shall be protected with an integral guard.

3. Refrigerant flow from the outdoor unit shall be independently controlled by means of individual electronic linear expansion valves for each indoor unit.

D. Compressor:

1. The compressor motor shall be direct current (DC) type designed for variable speed operation.

2. The compressor shall be a high performance, hermetic, inverter driven, variable speed, rotary type.

3. The outdoor unit shall be equipped with a suction side refrigerant accumulator.

4. The compressor will be equipped with an internal thermal overload.

5. The compressor shall be mounted to avoid the transmission of vibration.


E. Manifold:

The outdoor unit shall have manifold connections providing a separate set of flared fittings for each indoor unit per the table below:

Port Connections

A

B

C

D

MXZ2A20NA

¼ “ Liquid : 3/8” Gas

¼ “ Liquid : 3/8” Gas







MXZ3A30NA

¼ “ Liquid : 1/2” Gas

¼ “ Liquid :
3/8” Gas

¼ “ Liquid :
3/8” Gas




MXZ4A36NA

¼ “ Liquid : 1/2” Gas

¼ “ Liquid : 3/8” Gas

¼ “ Liquid :

3/8” Gas

¼ “ Liquid :

3/8” Gas

[Some indoor unit combinations may require port adaptors for proper connection]

F. Piping Requirements:

The outdoor unit must have the ability to operate within the following refrigerant piping and height limitations without the need for line size changes, traps or additional oil.

Piping Lengths:

Refrigerant Piping Data

Length to each indoor unit

Total piping length

MXZ2A20NA

82 feet (Max)

164 feet (Max)

MXZ3A30NA

82 feet (Max)

230 feet (Max)

MXZ4A36NA

82 feet (Max)

230 feet (Max)


Height Differential:

Model

Indoor unit above outdoor unit

Indoor unit below outdoor unit

MXZ2A20NA

49 feet (Max)

33 feet (Max)

MXZ3A30NA

49 feet (Max)

33 feet (Max)

MXZ4A36NA

49 feet (Max)

33 feet (Max)



F. Electrical:

1. The unit electrical power shall be 208/230 volts, 1-phase, 60 hertz.

2. The unit shall be capable of satisfactory operation within voltage limits of 198 volts to 253 volts.

3. The outdoor unit shall be controlled by the microprocessors located in the indoor unit and in the outdoor unit communicating system status, operation, and instructions digitally over A-Control wiring.

4. The outdoor unit shall be equipped with Pulse Amplitude Modulation (PAM) compressor inverter drive control for maximum efficiency with minimum power consumption.

Mr. Slim MXZ Series Guide Specification ©Dec 2007 Mitsubishi Electric / HVAC

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