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PAW-VP•LDHW - Technical Manual – 2019-11
Tubing Data and Refrigerant
5
5.2 Calculation of the refrigerant charge
How to calculate refrigerant charge
Example 1:
PAW-VP1000LDHW and U-250PZH2E8
Tubing lengths L = 25 m
(7.5 m – 25 m = 17.5 m)
Find the liquid tube size and additional
charge from the tables below.
17.5 m × 80 g = 1400 g
1400 g – 1500 g = –100 g
Total amount to recover 100g
Example 2:
PAW-VP750LDHW and U-250PZH2E8
Sample tubing lengths L = 10 m
(7.5 m – 10 m = 2.5 m)
Find the liquid tube size and additional
charge from the tables below.
2.5 m × 80 g = 200 g
200 g – 1500 g = 1300 g
Total amount to recover 1300 g
5.3 Temperature loss by refrigerant pipe length
If the discharge pipe is well insulated between
the heat pump and the tank, the heat loss is
approximately 0.2 ˚C per meter.
Height dif
ferential of indoor/outdoor units (higher/lower) H1
Tubing length (L)
Outdoor unit
DHW (Tank)
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