Sanyo 85464359982001 Straight Equivalent Length of Joints, Additional Refrigerant Charge

07-007 W-2WAY_II_NA 1/23/07 6:09 PM Page 13

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 1-13 Straight Equivalent Length of Joints									Unit: ft.
Gas tubing size (in. (mm))	1/2"	5/8"		3/4"	7/8"	1"	1-1/8"	1-1/4"	1-1/2"
	(12.7)	(15.88)		(19.05)	(22.22)	(25.4)	(28.58)	(31.8)	(38.1)
90° elbow	1	1.1		1.4	1.6	1.7	1.9	2.3	2.6
45° elbow	0.8	0.9		1	1.2	1.3	1.4	1.7	1.9
U-shape tube bent (R2-3/8" – 4" (60 – 100))	3	3.4		4.1	4.7	5.1	5.6	6.9	7.8
Trap bend	7.5	9.2		10.5	12.5	14.1	15.4	16.4	14.0
Y-branch distribution joint			Equivalent length conversion not needed.
Ball valve for service			Equivalent length conversion not needed.

Table 1-14 Refrigerant tubing (Existing tubing can be used.)

Tubing size (in. (mm))

Material O		Material 1/2H • H
ø1/4" (ø6.35)	t1/32" (0.8)	ø7/8" (ø22.22)	t5/128" (1.0)
ø3/8" (ø9.52)	t1/32" (0.8)	ø1" (ø25.40)	t5/128" (1.0)
ø1/2" (ø12.7)	t1/32" (0.8)	ø1-1/8" (ø28.58)	t5/128" (1.0)
ø5/8" (ø15.88)	t5/128" (1.0)	ø1-1/4" (ø31.75)	t3/64" (1.1)
ø3/4" (ø19.05)	over t5/128" (1.0)	ø1-1/2" (ø38.10)	over t3/64" (1.15)
		ø1-5/8" (ø41.28)	over t3/64" (1.20)

1-8. Additional Refrigerant Charge

*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.

Additional refrigerant charge amount is calculated from the liquid tubing total length as follows.

Table 1-15 Amount of Refrigerant Charge Per Meter, According to Liquid Tubing Size

Liquid tubing size	Amount of refrigerant
(in. (mm))	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 charge = (Amount of refrigerant charge per meter of each size of liquid tube ⋅ its tube length) + (...) + (...)

*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 Max. additional charge for 3 outdoor units :133 lbs

Table 1-16 Refrigerant Charge Amount at Shipment (for outdoor unit)

DC

(oz)

CHDX09053	CHDX14053
423	458

1-9. System Limitations

Table 1-17 System Limitations

Max. No. allowable connected outdoor units	2 *1
Max. capacity allowable connected outdoor units	307,100 BTU/h (32 hp, 90 kW)
Max. connectable indoor units	40
Max. allowable indoor/outdoor capacity ratio	50 – 130 %

*1: Up to 2 units can be connected if the system has been extended.

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