Sanyo SPW-C0705DXHN8 - Page 29

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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 1 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 1 Correction coefficient for equivalent length when the size of the gas tube (LM) is increased
Standard tube diameter
(gas tubes , mm)
ø12.7 ø15.88 ø19.05 ø22.22 ø25.4 ø28.58 ø31.75 ø38.1
Tube diameter after change
(gas tubes , mm)
ø15.88 ø19.05 ø22.22 ø25.4 ø28.58 ø31.75 ø38.1 ø41.28
Equivalent length correction
coefficient
0.4 0.5 0.6 0.7
* When increasing the size of the suction and discharge tubing (LM), multiply by the correction coefficient from Table 1 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
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2. System Design