2-5
Design of W-2WAY ECO-i SYSTEM Unit Specifications
1. Model Selecting and Capacity Calculator
3: If the longest main tube length (LM) exceeds 50 m, increase the main tube size at the portion before 50 m by 1 rank for the
gas tubes. (Use a field supply reducer.)
(For the portion that exceeds 50 m, set based on the main tube sizes (LA) listed in the table on the following page.)
4: If the size of the existing tubing is already larger than the standard tubing size, it is not necessary to further increase the
size.
* 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: 28 kg
Max. additional charge for 2 outdoor units: 50 kg
Max. additional charge for 3 outdoor units: 60 kg
Table 1-2 Refrigerant Charge Amount at Shipment (for outdoor unit)
SPW-C0705DXHN8 SPW-C0905DXHN8 SPW-C1155DXHN8 SPW-C1305DXHN8 SPW-C1405DXHN8
12 kg 12 kg 12 kg 13 kg 13 kg
Additional Refrigerant Charge
Additional refrigerant charge amount is calculated from the liquid tubing total length as follows.
Table 1-3 Amount of Refrigerant Charge Per Meter, According to Liquid Tubing Size
Liquid tubing size Amount of refrigerant
charge/m (g/m)
Required amount of charge = (Amount of refrigerant charge per meter of
each size of liquid tube × its tube length) + (...) + (...)
ø6.35 26
*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 : 28 kg
Max. additional charge for 2 outdoor units: 50 kg
Max. additional charge for 3 outdoor units: 60 kg
ø9.52 56
ø12.7 128
ø15.88 185
ø19.05 259
ø22.22 366
Table 1-4 System Limitations
Max. No. allowable connected outdoor units 3 *²
Max. capacity allowable connected outdoor units 135 kW (48 hp)
Max. connectable indoor units 40 *¹
Max. allowable indoor/outdoor capacity ratio 50 – 130 %
*1: In the case of 22 hp (type 61.5 kW) or smaller units, the number is limited by the total capacity of the connected indoor units.
*2: Up to 3 units can be connected if the system has been extended.
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