Mitsubishi Electronics PUHY-YMC installation manual Refrigerant piping system, + α

10.2. Refrigerant piping system

Constant

Variable

capacity unit

capacity unit

Constant

Variable

Distributer (gas) (optional)

capacity unit

capacity unit

Oil balance pipe (optional) I

Gas line B

(for distribution within the unit)

Gas line A

Liquid line B

Liquid line A

A

G

B

Note 1

Distributer (liguid) (optional)

Line-branch method

Distributer

L

Gas line (main) C

Liquid line (main) C

Connection examples

(liquid)

:indicates piping connection points

Distributer

(connecting to six indoor units)

H

(gas)

R

To down stream units

C

D

E

F

G

A

First branch

a

b

c

d

e

f

Note:

Indoor

unit

Indoor

Indoor

Indoor

Indoor

•

The model total for downstream units shown

1

unit

unit

unit

unit

in the table below is the model total when

h

2

3

4

5

Indoor

viewed from Point A in the drawing above.

unit

6

•

With the exception of PUHY-600YMC, the

first branch is always CMY-Y302-F.

Note 1: Because it is built into the variable capacity unit, B is used to carry liquid only. Set the constant capacity unit and

variable capacity unit in accordance with the G dimension given in the figure above (G = 0.01 m).

Item

Piping components

Tolerance

length

Indoor

Total piping length

A+B+C+D+E+F+G+a+b+c+d+e+f

220 m or less

Farthest piping length after first branch (r)

D+E+F+G+f

40 m or less

side

Farthest piping length

(L)

A (B)+C+D+E+F+G+f

100 m or less (Max. equivalent length 125 m)

Permissible

The included oil balance pipe must be used. If any other piping is used, the length

Outdoor

Oil balance pipe

I

of the oil balance pipe must be no more than 3 m (max. equivalent length 4 m),

side

and height from the bottom of the unit must be no more than 0.1 m.

Distributer (liquid)/Variable capacity unit, Constant capacity unit

A, B (Liquid line)

4 m or less (Max. equivalent length 5 m)

Distributer (gas)/Constant capacity unit

A (Gas line)

4 m or less (Max. equivalent length 5 m)

Permissible high/

Indoor/Outdoor

Outdoor upper

H

50 m or less

Outdoor lower

H

40 m or less

Low difference

Indoor/Indoor

h

15 m or less

Variable capacity unit/Constant capacity unit

–

Must be installed on same frame, and there must be no high/low difference.

■ Selecting the refrigerant branch kit

Select the branch kit, sold separately, from the table below. (Each kit contains a refrigerant and gas piping set.)

Use the table to the right to make the selection based

Downstream unit model total

Branch kit model

on the model total of indoor units downstream from the

160 or less

CMY-Y102S-F

branch section.

161 to 330

CMY-Y102L-F

331 to 630

CMY-Y202-F

631 or more

CMY-Y302-F

■

Select each section of refrigerant piping

(1) Refrigerant piping diameter in section from out-

(2) Refrigerant piping diameter in section from branch

door unit to first branch (outdoor unit piping diam-

to indoor unit (indoor unit piping diameter)

(1)

Section from outdoor unit to first

eter)

Model number

Piping diameter (mm)

branch (C)

Each section

Model

Piping diameter (mm)

Liquid line

ø 6.35

(2) Sections from branch to indoor

20 ·25 ·32 ·40

Liquid line

Gas line

Gas line

ø 12.7

unit (a, b, c, d, e, f)

of piping

PUHY-600YSMC

ø 19.05

ø 38.1

Liquid line

ø 9.52

(3) Section from branch to branch

50 ·63 ·71 ·80

PUHY-650YSMC

ø 19.05

ø 44.45

Gas line

ø 15.88

(D, E, F, G)

PUHY-700YSMC

ø 19.05

ø 44.45

100 ·125

Liquid line

ø 9.52

Select the size from the table to the right.

PUHY-750YSMC

ø 19.05

ø 44.45

Gas line

ø 19.05

(3)Refrigerant piping diameter in section from branch to branch

Downstream unit model total

Liquid line (mm)

Gas line (mm)

80 or less

ø 9.52

ø 15.88

81 to 160

ø 12.7

ø 19.05

(kg)

161 to 330

ø 12.7

ø 25.4

Variable capacity unit

Constant capacity unit

331 to 480

ø 15.88

ø 31.75

400

500

200

250

481 to 630

ø 15.88

ø 38.1

16

22

6.5

8.5

631 or more

ø 19.05

ø 44.45

Additional refrigerant charge

■

<Additional charge>

The outdoor unit is charged with refrigerant at the time of

Liquid pipe size

Liquid pipe size

Liquid pipe size

Liquid pipe size

Liquid pipe size

shipping according to the chart above.

As this charge

total length of

total length of

total length of

total length of

total length of

does not include the amount needed for extended piping,

ø 19.05 ⋅ 0.29

+

ø 15.88 ⋅

0.25

+

ø 12.7 ⋅ 0.12

+

ø 9.52 ⋅ 0.06

+

ø 6.35 ⋅

0.024

+ α

additional charging for each refrigerant line will be required

on site. In order that future servicing may be properly

provided, always keep a record of the size and length of

(m) ⋅ 0.29 (kg/m)

(m) ⋅ 0.25 (kg/m)

(m) ⋅ 0.12 (kg/m)

(m) ⋅

0.06 (kg/m)

(m) ⋅ 0.024 (kg/m)

each refrigerant line and the amount of additional charge

<Example> Indoor 1 : 125

A : ø 12.7

3 m

a

:ø 9.52

15 m

by writing it in the space provided on the outdoor unit.

■ Calculation of additional refrigerant charge

2 : 125

B : ø 15.88

1 m

b

:ø 9.52

15 m

At the conditions

3 : 125

C : ø 19.05

40 m

c

:ø 9.52

10 m

• Calculate the amount of additional charge based on the length

4 : 125

D : ø 15.88

10 m

d

:ø 9.52

5 m

below:

of the piping extension and the size of the refrigerant line.

5 : 100

E : ø 15.88

5 m

e

:ø 9.52

5 m

• Use the table to the right as guide to calculating the amount

6 : 40

F : ø 12.7

5 m

f

:ø 6.35

5 m

of additional charging and charge the system according.

G : ø 12.7

5 m

•

If the calculation results in a fraction of less than 0.1 kg,

The total length of each liquid line is as follows

Value of α

round up to the next 0.1 kg. For example, if the result of the

ø 19.05 : C = 40 m

calculation was 23.28 kg, round the result up to 23.3 kg.

ø 15.88 : B + D + E = 1 + 10 + 5 = 16 m

Total capacity of

α

•

If the total amount of refrigerant including the amount

ø 12.7 : A + F + G = 3 + 5 + 5 = 13 m

connecting indoor units

of refrigerant sealed in the outdoor unit when shipped

ø 9.52 : a + b + c + d + e = 50 m

to Model 80

1.0 kg

ø 6.35 : f = 5 = 5 m

from the factor plus additional refrigerant for exten-

Models 81 to 160

1.5 kg

Therefore,

sion piping exceeds 73 kg, use 73 kg as the total

Models 161 to 330

2.0 kg

<Calculation example>

amount of refrigerant.

Models 331 to 480

2.5 kg

Additional

Amount of refrigerant when shipped from factory +

refrigerant charge = 40 ⋅

0.29 +16 ⋅

0.25 + 13 ⋅ 0.12 +

Models 481 to 630

3.0 kg

added refrigerant = 73 kg

50 ⋅

0.06 + 5 ⋅

0.024 + 3.0 = 23.3 kg

Models 631 or more

4.0 kg

ENGLISH

13