Panasonic ECOi 2 Way Manual de instalación descargar pdf (Pagina 10)

1-9. System Limitations

Max. No. allowable connected outdoor units 3 *1

Max. capacity allowable connected outdoor units 288,000 BTU/h (24 ton, 84.4 kW)

Max. connectable indoor units 40

Max. allowable indoor/outdoor capacity ratio 50 – 130 %

*1: Up to 3 units can be connected if the system has been extended.

1-7. Straight Equivalent Length of Joints

Design the tubing system by referring to the following table for the straight equivalent length of joints.

Table 1-8 Straight Equivalent Length of Joints

Gas tubing size (in. (mm))

1/2"

(12.7)

5/8"

(15.88)

3/4"

(19.05)

7/8"

(22.22)

(25.4)

1-1/8"

(28.58)

1-3/8"

(34.92)

1-5/8"

(41.28)

90° elbow

1 1.1 1.4 1.6 1.7 1.9 2.5 2.8

45° elbow 0.8 0.9 1 1.2 1.3 1.4 1.8 2.0

U-shape tube bent (R2-3/8" – 4" (60 – 100)) 3 3.4 4.1 4.7 5.1 5.6 7.4 8.4

Trap bend

7.5 9.2 10.5 12.5 14.1 15.4 19.2 22.3

Y-branch distribution joint Equivalent length conversion not needed.

Ball valve for service Equivalent length conversion not needed.

Table 1-9 Refrigerant tubing (Existing tubing can be used.)

Tubing size (in. (mm))

Material O Material 1/2H • H

ø1/4" (ø6.35) t1/32" (t0.8) ø7/8" (ø22.22) t5/128" (t1.0)

ø3/8" (ø9.52) t1/32" (t0.8) ø1" (ø25.4) t5/128" (t1.0)

ø1/2" (ø12.7) t1/32" (t0.8) ø1-1/8" (ø28.58) t5/128" (t1.0)

ø5/8" (ø15.88) t5/128" (t1.0) ø1-1/4" (ø31.75) t3/64" (t1.1)

ø3/4" (ø19.05) over t5/128" (t1.0) ø1-1/2" (ø38.1) over t3/64" (t1.15)

ø1-5/8" (ø41.28) over t3/64" (t1.20)

* When bending the tubes, use a bending

radius that is at least 4 times the outer

diameter of the tubes.

In addition, take sufficient care to avoid

crushing or damaging the tubes when

bending them.

1-8. Additional Refrigerant Charge

Additional refrigerant charge amount is calculated from the liquid tubing total length and a type of outdoor unit as follows.

Liquid tubing size Amount of additional

(in. (mm)) refrigerant charge (oz/ft.)

ø1/4" (ø6.35) 0.279

ø3/8" (ø9.52) 0.602

ø1/2" (ø12.7) 1.38

ø5/8" (ø15.88) 1.99

ø3/4" (ø19.05) 2.78

ø7/8" (ø22.22) 3.93

Required amount of additional refrigerant charge = [(Amount of additional refriger-

ant charge per ft. of each size of liquid tube

× its tube length) + (...) + (...)] + [Nec-

essary amount of additional refrigerant charge per outdoor unit + (...) + (...)]

* Always charge accurately using a scale for weighing.

* If the existing tubing is used, and the amount of on-site additional refrigerant

charge exceeds the value listed below, then change the size of the tubing to

reduce the amount of refrigerant.

Max. additional charge for 1 outdoor unit :62 lbs

Max. additional charge for 2 outdoor units :111 lbs

Unit: ft.

Table 1-11 System Limitations

Table 1-10-1 Amount of Additional Refrigerant Charge Per ft., According to Liquid Tubing Size

Table 1-10-2 Necessary Amount of Additional Refrigerant Charge Per Outdoor Unit

Further charge a certain amount listed below in addition to the amount of refrigerant charge.

U-72ME1U9, U-72ME1U9E U-96ME1U9, U-96ME1U9E

42 oz/unit 42 oz/unit

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 51 52

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Panasonic ECOi 2 Way Manual de instalación Pagina 10

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