Available pipe size
Liquid side
Gas side

4. Installing the refrigerant piping

A

45°±2°

B

 

 

° ±0.5°

øA

 

90

 

 

 

 

Fig. 4-1

A Flare cutting dimensions

 

 

 

Copper pipe O.D.

Flare dimensions

(mm, inch)

øA dimensions (mm, inch)

ø6.35, 1/4”

8.7

- 9.1, 11/32-23/64

ø9.52, 3/8”

12.8 - 13.2, 1/2-33/64

ø12.7, 1/2”

16.2

- 16.6, 41/64-21/32

ø15.88, 5/8”

19.3

- 19.7, 49/64-25/32

4.1. Precautions

4.1.1. For devices that use R410A refrigerant

•Use ester oil, ether oil, alkylbenzene oil (small amount) as the refrigeration oil applied to the flared sections.

•Use C1220 copper phosphorus, for copper and copper alloy seamless pipes, to connect the refrigerant pipes. Use refrigerant pipes with the thicknesses specified in the table to the below. Make sure the insides of the pipes are clean and do not contain any harmful contaminants such as sulfuric com- pounds, oxidants, debris, or dust.

Warning:

When installing or moving the air conditioner, use only the specified refriger- ant (R410A) to charge the refrigerant lines. Do not mix it with any other refriger- ant and do not allow air to remain in the lines. Air enclosed in the lines can cause pressure peaks resulting in a rupture and other hazards.

 

 

A12, A18

Liquid pipe

ø6.35mm, 1/4 inch

thickness 0.8 mm, 1/32 inch

Gas pipe

ø12.7mm, 1/2 inch

thickness 0.8 mm, 1/32 inch

•Do not use pipes thinner than those specified above.

(inch)

4.2. Connecting pipes (Fig. 4-1)

 

 

• When commercially available copper pipes are used, wrap liquid and gas pipes

C

with commercially available insulation materials (heat-resistant to 100 °C, 212 °F or

more, thickness of 12 mm, 1/2 inch or more).

 

•

The indoor parts of the drain pipe should be wrapped with polyethylene foam insu-

 

lation materials (specific gravity of 0.03, thickness of 9 mm, 23/64 inch or more).

•

Apply thin layer of refrigerant oil to pipe and joint seating surface before tightening

Dflare nut.

•Use two wrenches to tighten piping connections.

•Use refrigerant piping insulation provided to insulate indoor unit connections. Insu- late carefully.

BFlare nut tightening torque

Copper pipe O.D.

Flare nut O.D.

Tightening torque

(mm, inch)

(mm, inch)

(N·m, ft·lbs)

ø6.35, 1/4”

17, 43/64

14 - 18, 10-13

ø9.52, 3/8”

22, 7/8

34 - 42, 25-30

ø12.7, 1/2”

26, 1-3/64

49 - 61, 35-44

ø15.88, 5/8”

29, 1-9/64

68 - 82, 49-59

CApply refrigerating machine oil over the entire flare seat surface.

DUse correct flare nuts meeting the pipe size of the outdoor unit.

A12, A18

ø6.35

–

ø12.7

–

–

: Factory flare nut attachment to the heat-exchanger.

5

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Mitsubishi Electronics PKA-A-GA installation manual Installing the refrigerant piping, Precautions, Connecting pipes Fig
Page 4 Page 6

PKA-A-GA specifications

Mitsubishi Electronics has long been a key player in the realm of air conditioning and climate control technologies, offering a range of innovative solutions that cater to both residential and commercial needs. Among their impressive lineup, the Mitsubishi PKA-A-GA stands out as a noteworthy model known for its advanced features, efficiency, and reliability.

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This model utilizes cutting-edge inverter technology, which significantly enhances energy efficiency. By adjusting the compressor speed according to the cooling demand, the PKA-A-GA maintains a consistent temperature while reducing energy consumption. This not only lowers utility bills but also contributes to a more sustainable operation, making the unit eco-friendly.

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Overall, the Mitsubishi PKA-A-GA is an exceptional air conditioning solution, blending efficiency, smart technology, and user-friendly features into a compact design. Whether for residential or commercial applications, it promises to deliver comfort and satisfaction in an ever-evolving climate.
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