Sanyo ECO G SGP-EW120M2G2W, Technical Data Manual

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System Design
3. Refrigerant piping design
D-14
If the following is true in Fig. 1, then ventilation devices with the indicated ventilation volume are required:
2/3 > Total amount of refrigerant charge for the system / Room volume > 0.3
The range indicated by
in Fig. 1 is the range in which: Total amount of refrigerant charge for the system
/ Room volume 2/3. If the value is within the range indicated by , either the room must be enlarged (for
example, by removing a door connecting to the next room), or the outdoor unit must be reduced in size.
For example, consider the case where a 2.8 kW indoor unit is installed in a 16.5 m
2
, 2.7 mH room, and is
connected to a single 56.0 kW outdoor unit. If 18 kg of refrigerant is added to the charge, the total charge is
17 + 18 = 35 kg.
35÷(16.5×2.7) = 0.79 > 2/3 (= 0.67)
Because this is within the range on the graph indicated by
, either the room must be made larger or the
outdoor unit must be reduced in size.
* The outdoor unit is already charged with refrigerant at the time of shipping, so this must be added to the
amount of refrigerant added on site.
[Refer to Section (6) “Calculation of amount of additional refrigerant charge,” for the quantity of refrigerant
filled at the time of shipping.]