System Design
3. Refrigerant piping design
D-12
(6) Calculation of amount of additional refrigerant charge
1) Table 2 shows the refrigerant charge at factory shipping time. Additional refrigerant must be added
according to the size and length of the piping (calculated from the size and diameter of the liquid piping
using the values in Table 1).
Table 1. Quantity of additional refrigerant charge
Table 2.
Required additional refrigerant charge (g)
= 366 × (A) + 259 × (B) + 185 × (C) + 128 × (D) +56 × (E) + Unit additional charge amount (F)
Table 3.
(A) = total length in meters of 22.22 mm diameter liquid piping
(B) = total length in meters of 19.05 mm diameter liquid piping
(C) = total length in meters of 15.88 mm diameter liquid piping
(D) = total length in meters of 12.70 mm diameter liquid piping
(E) = total length in meters of 9.52 mm diameter liquid piping
(F) = Unit additional charge amount (Table 3)
2) Be careful to charge accurately according to refrigerant weight.
3) Charging procedure
Evacuate the system, close the gauge manifold at the gas pipe side to ensure that no refrigerant enters the
gas pipe side, then charge the system with liquid refrigerant at the liquid pipe side. While charging, keep all
valves fully closed.
The compressor can be damaged if liquid refrigerant is added at the gas pipe side.
4) If the system does not accept the predetermined quantity of refrigerant, fully open all valves and run the
system (either heating or cooling). While the system is running, gradually add refrigerant at the low
pressure side by slightly opening the valve on the cylinder just enough so that the liquid refrigerant is
gasified as it is sucked into the system. (This step is normally only needed when commissioning the
system.)
All outdoor unit valves should be fully open.
5) When charging is completed, fully open all valves.
6) Avoid liquid back-flow when charging with R410A refrigerant by adding small amounts at a time.
Notes
•
When charging with additional refrigerant, use liquid only.
•
R410A cylinders are colored gray with a pink top.
•
Check whether a siphon pipe is present (indicated on the label at the top of the cylinder).
•
Depending on refrigerant and system pressure, conventional refrigerant (R22, R407A) equipment may
or may not be compatible with R410A equipment, so care is needed. In particular, the gauge manifold
used must be specifically designed for R410A.
•
Be sure to check the limiting density.
•
Refer to the section “Opening the closed valves” when the instructions call for fully opening all valves.
Model Type
No.
Quantity of refrigerant
charge when shipped (kg)
Model 120
Model 150
Model 190
Model 240
11.5
Liquid pipe
diameter (mm)
Additional charge quantity per
meter (g/m)
φ
9.52
56
φ
12.7 128
φ
15.88 185
φ
19.05 259
φ
22.22 366
Model Type
No.
Unit additional charge
amount (kg)
Model 120
Model 150
1.5
Model 190
4.5
Model 240
8.5
Summary of Contents for ECO G SGP-EW120M2G2W
Page 3: ...A 1 System Configuration Contents 1 Type Configuration 1 Outdoor unit A 2 ...
Page 12: ...Outdoor Unit 3 External Dimensions B 8 ...
Page 13: ...Outdoor Unit 4 Wiring Diagram B 9 ...
Page 14: ...Outdoor Unit 5 Performance Characteristics B 10 Cooling Heating SGP EW120M2G2W ...
Page 15: ...Outdoor Unit 5 Performance Characteristics B 11 Cooling Heating SGP EW150M2G2W ...
Page 16: ...Outdoor Unit 5 Performance Characteristics B 12 Cooling Heating SGP EW190M2G2W ...
Page 17: ...Outdoor Unit 5 Performance Characteristics B 13 Cooling Heating SGP EW240M2G2W ...
Page 18: ...Outdoor Unit 6 Operating Sound Level Characteristics B 14 1 Standard Mode ...
Page 19: ...Outdoor Unit 6 Operating Sound Level Characteristics B 15 ...
Page 20: ...Outdoor Unit 6 Operating Sound Level Characteristics B 16 ...
Page 21: ...Outdoor Unit 6 Operating Sound Level Characteristics B 17 ...
Page 22: ...Outdoor Unit 6 Operating Sound Level Characteristics B 18 2 Quiet Mode ...
Page 23: ...Outdoor Unit 6 Operating Sound Level Characteristics B 19 ...
Page 24: ...Outdoor Unit 6 Operating Sound Level Characteristics B 20 ...
Page 25: ...Outdoor Unit 6 Operating Sound Level Characteristics B 21 ...
Page 28: ...Control Related 1 System Block Diagram C 2 ...
Page 29: ...Control Related 2 Remote Control Warning List C 3 ...
Page 30: ...Control Related 2 Remote Control Warning List C 4 ...
Page 31: ...Control Related 2 Remote Control Warning List C 5 ...
Page 76: ...Installation Work 1 Points regarding refrigerant pipe work E 3 APR P680BG ...
Page 77: ...Installation Work 1 Points regarding refrigerant pipe work E 4 APR P1350BG ...
Page 78: ...Installation Work 1 Points regarding refrigerant pipe work E 5 APR CHP680BG APR CHP1350BG ...
Page 86: ...Installation Work 2 Points regarding electrical work outdoor unit E 13 ...
Page 87: ...Installation Work 3 Outdoor unit installation work E 14 ...
Page 88: ...Installation Work 3 Outdoor unit installation work E 15 ...
Page 89: ...Installation Work 3 Outdoor unit installation work E 16 ...
Page 90: ...Installation Work 3 Outdoor unit installation work E 17 ...
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