Sanyo DHX4852 User Manual
Page 29
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2-19
Design of W-2WAY ECO-i SYSTEM Unit Specifications
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(3) Increasing the size of the refrigerant tubing
Increasing the tubing size of the gas tubes can reduce the loss of capacity caused by longer tubing lengths.
Refer to Table 2-13 to increase the tubing size. However, the maximum allowable tubing length must not be exceeded.
*
The amount of additional refrigerant charge is determined from the liquid tube size only.
Table 2-13 Correction coefficient for equivalent length when the size of the gas tube (LM) is increased
Standard tube diameter
(gas tube, in.(mm))
ш1/2"
(ш12.7)
ш5/8"
(ш15.88)
ш3/4"
(ш19.05)
ш7/8"
(ш22.22)
ш1-1/8"
(ш28.58)
Tube diameter after change
(gas tube, in.(mm))
ш5/8"
(ш15.88)
ш3/4"
(ш19.05)
ш7/8"
(ш22.22)
ш1-1/8"
(ш28.58)
ш1-3/8"
(ш34.93)
Equivalent length correction
coefficient
0.4
0.5
0.6
*
When increasing the size of the suction and discharge tubing (LM), multiply by the correction coefficient from Table 2-13 and
calculate the equivalent length for section LM.
Tubing equivalent length after size increase
= Standard tubing equivalent length × Equivalent length correction coefficient
2-2. Example of Tubing Size Selection for Extension and Additional Charge Amount
Sample calculation for the system below
964
09053
14053
3652
4852
1852
1852
1852
0952
3652
3652
1852
LH
16.4ft
16.4ft
2. System Design
TD831138-02_W-2WAY.indb 19
2007/07/26 14:30:42