Sanyo SGP-M2 Procedimientos Y Puntos Técnicos Para La Instalación Del Sistema página 35

3-5. Refrigerant charge
Calculation of amount of additional refrigerant charge
(1) Table 6 shows the refrigerant charge at factory shipping time. Additional refrigerant must be added ac-
cording to the size and length of the tubing (calculated from the size and diameter of the liquid tubing us-
ing the values in Table 5).
Table 5 Quantity of additional refrigerant charge
Liquid tube size (mm)
φ 9.52
φ12.7
φ15.88
φ19.05
Required additional refrigerant charge (g) =
(A) = total length in meters of 19.05 mm diameter liquid tubing
(B) = total length in meters of 15.88 mm diameter liquid tubing
(C) = total length in meters of 12.7 mm diameter liquid tubing
(D) = total length in meters of 9.52 mm diameter liquid tubing
(E) = Unit additional charge amount (Table 7)
(2) Be careful to charge accurately according to refrigerant weight.
(3) Charging procedure
Evacuate the system, close the gauge manifold at the gas tube side to ensure that no refrigerant enters
the gas tube side, then charge the system with liquid refrigerant at the liquid tube side. While charging,
keep all valves fully closed.
The compressor can be damaged if liquid refrigerant is added at the gas tube 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 pres-
sure side by slightly opening the valve on the cylinder just enough so that the liquid refrigerant is gasifi ed
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-fl ow when charging with R410A refrigerant by adding small amounts at a time.
Table 6
Additional charge
quantity per meter (g/m)
56
128
185
259
259 × (A) + 185 × (B) + 128 × (C) + 56 × (D) +
Unit additional charge amount (E)
GB - 35
Quantity of refrigerant
Model No.
charge when shipped (kg)
Type 150
Type 190
Type 240
Table 7
Unit additional
Model No.
charge amount (kg)
Type 150
Type 190
Type 240
11.5
8.5
12.5