Sanyo SPW-C1155DXHN8 Technical Data & Service Manual page 29

2. System Design
(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)
Tube diameter after change
(gas tubes , mm)
Equivalent length correction
coefficient
* 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
ø12.7 ø15.88 ø19.05 ø22.22
ø15.88 ø19.05 ø22.22 ø25.4
0.4 0.5
Design of W-2WAY ECO-i SYSTEM Unit Specifications
ø25.4 ø28.58 ø31.75
ø28.58 ø31.75 ø38.1
0.6
2-19
ø38.1
ø41.28
0.7
964
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