R410A DC Inverter Multi-split Technical Manual
Installation
61
GD Chigo Heating & Ventilation Equipment Co., Ltd.
4. Refrigerant charge
1) When the length of the one-way pipe is less than 5m, additional refrigerant charge after vacuuming is
unnecessary.
2) When the length of one-way pipe is over 5m, the additional charge quantity is as follows (unit in gram):
Calculation method:
Refrigerant
Liquid diameter
（
mm
）
Unit amount (g/m)
Formula
R410A
Ф6.35
15
(L-5)×15
Remark: 1. The additional refrigerant charge is simply related with the liquid pipe diameter.
2.
In the up formula, “L” means the length of liquid pipe between each indoor unit and outdoor
unit (unit: m).
