Airwell KXV Series, Engineering Manual

Page: 25 / 380

Engineering manual
25
3.11 Refrigerant additional charge (based on piping length and size)
3.11.1 Calculate the system additional charge

Refrigerant Charge Amount at shipment (for outdoor unit)
YAV112 YAV140
Heat Pump Unit (kg)
4.5 5.5

According the refrigerant pipe length and dimension, we need charge additional refrigerant.
The required additional refrigerant charge (kg) = （ 25×a+55×b+120×c ） ×
10
-3
a: Total length of Φ 6.35 (m) liquid tube
b: Total length of Φ 9.52 (m) liquid tube
c: Total length of Φ 12.7(m) liquid tube.
3.11.2 Judge the system refrigerant quantity
There is a function in our VRF system to judge whether the quantity of the system refrigerant enough or not. This
function is named CTEST (charge test), we can apply it according to the HMI’s operation (Refer to ODU’s introduction
in this manual)
The CTEST operation flow is as below:
Table 3-7