Sanyo SPW-C0705DZH8 - Increasing the Size of the Refrigerant Tubing; Sample Calculation for the System below

(3) Increasing the size of the refrigerant tubing
Increasing the tubing size of the suction and discharge tubes can reduce the loss of capacity caused by longer
tubing lengths. (Only the main suction and discharge tubes with the largest tube diameter (main tube LA and
main tubes after the distribution point that are the same size as LA) can be changed.)
In this case, it is necessary to recalculate the actual indoor unit capacities. Refer to the table below to increase
the tubing size. However, total tubing length must not exceed the maximum allowable tubing length.
2-2. Example of Tubing Size Selection for Extension and Additional Charge Amount
Standard tube diameter
ø 31.75
ø 38.1
ø 38.1 ø 41.28
0.6
0.7
• Correction coefficient for equivalent length when the size of the largest main
wide tube is increased
• Sample calculation for the system below
* The connection between the indoor unit(s) and the solenoid valve kit(s) has three (3) types of methods.
For further details, refer to the Section 2. 3-4. "Connecting Multiple Indoor Units to a Single Solenoid Valve Kit".
*
(suction and discharge tubes, mm)
Tube diameter after change
(suction and discharge tubes, mm)
Equivalent length
correction coefficient
Tubing equivalent length after size increase
= Standard tubing equivalent length × Equivalent length correction coefficient
Extension indoor units
Extension
outdoor units
Type 90 Type 115
Lc
Lb La
LP
LA
LN
L1
L7
L2 L3
L4 L5 L6
L11L10
L9L8
L13
L12
LK
L14 L15
LJ
LI
LM
LH
LL
LG
LB LC LD LE1 LE2
LF
Type 140
Type 36
Type 36
Type 36
Type 36
Type 36
Type 12
Type 25
Type 25 Type 18
Type 25
Type 36 Type 25
Type 18 Type 9
Type 9
Elevation difference
H=4m
Elevation difference
H=5m
Elevation difference
H=5m
Solenoid Valve Kit
Outdoor units
10HP: SPW-CR904GDZH8B
10HP: SPW-CR904GDZH8B
8HP: SPW-CR704GDZH8B
2-20
Design of 3-WAY ECO-i SYSTEM
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2. System Design
TD831143-00W-3WAY.indb20TD831143-00W-3WAY.indb20 2008/12/0116:15:442008/12/0116:15:44