Example:

L1

LA

 

 

 

 

 

L2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Main tube of unit

 

LB

 

LC

 

LN

 

n

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1st branch

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

 

2

 

 

3

 

 

 

 

model 1852

 

 

 

 

 

 

 

 

 

Unit distribution tube

 

 

 

 

 

 

n–1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

model 0752

model 0952

model 1252

model 1852

Example of each tubing length

Main tubing

Distribution joint tubing

LA = 131 ft.

Indoor side

 

LB = 16 ft.

1

= 16 ft.

4 = 20 ft.

LC = 16 ft.

2

= 16 ft.

5 = 16 ft.

LD = 49 ft.

3

= 7 ft.

 

Obtain charge amount for each tubing size

Note that the charge amounts per 3.3 ft. are different for each liquid tubing size.

ø3/8" (ø9.52)

LA

+

LB

+

LC + LD

: 212 ft. 0.602 oz/ft.

=

127 oz

ø1/4" (ø6.35)

1

+

2

+

3 + 4 +

5 : 75 ft. 0.279 oz/ft.

=

20 oz

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Total

 

147 oz

Additional refrigerant charge amount is 147 oz.

CAUTION

Be sure to check the limit density for the room in which the indoor unit is installed.

Checking of limit density

Density limit is determined on the basis of the size of a room using an indoor unit of minimum capacity. For instance, when an indoor unit is used in a room (floor area 80 ft2 ceiling height 8.8 ft. = room volume 704 ft.3), the graph at right shows that the minimum room volume should be 497 ft.3 (floor area 56 ft.2) for refrigerant of 147 oz. Accordingly, openings such as louvers are required for this room.

<Determination by calculation>

Overall refrigerant charge amount for the air conditioner: oz

(Minimum room volume for indoor unit: ft.3)

=147 (oz) + 123 (oz) = 0.38 (oz/ft.3) > 0.3 (oz/ft.3) 704 (ft.3)

Therefore, openings such as louvers are required for this room.

Min. indoor volume

ft.3

4000

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3500

 

Range below

 

 

 

 

 

 

 

 

 

 

 

 

 

3000

 

the density limit of

 

 

 

 

 

0.3 oz/ft.3

 

 

 

 

 

 

 

 

 

 

 

 

 

2500

 

(countermeasures

 

 

 

 

 

not needed)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2000

 

 

 

 

 

 

 

 

 

 

 

1500

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Range above

 

 

 

 

 

 

1000

 

 

 

 

 

the density limit of

 

 

 

 

 

500

 

 

 

 

 

0.3 oz/ft.3

 

 

 

 

 

 

 

(countermeasures

 

 

 

 

 

0

 

 

 

 

 

needed)

 

 

 

 

 

 

 

 

 

 

 

 

 

0

200

400

600

800

1000

 

 

Total amount of refrigerant

ft.2

454

398

341

area

 

284

floor

227

indoor

170

 

114

Min.

 

 

57

 

 

 

0

 

1200

 

 

oz

 

(when the ceiling is 8.8 ft. high)

16

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Image 16
Sanyo 85464359981002 installation instructions Example, Main tubing Distribution joint tubing

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