MCAC-VTSM-2011-09
Installation
100
Refrigerant Piping Installation
Caution
1) The recharged refrigerant volume must be calculated according to the formula in the technical
reference of outdoor unit. It
isn’t allowed to calculate by running current, pressure and temperature.
Because current and pressure is changeable due to the difference of temperature and length of pipeline.
2) In the cold ambient, use warm water and hot wind to warm up refrigerant storage cylinder, and
don’t
allow heating up directly by flame.
3.4.1.3. Recharging of R410A refrigerant
If R410A refrigerant is adopted, the tool shall be different. Confirm the following items before Recharged:
1) The different vacuum pump with one-way valve.
2) The different pressure gauge: the nut of connector and pressure scale are different.
3) The different recharging soft pipe and connector.
4) The charging method is different. Recharge into the outdoor unit with liquid phase.
5) The different leak detector.
3.4.2 Calculating the recharged refrigerant volume
Calculate the recharged refrigerant volume by the length and dia. of liquid pipe of indoor units
R410A
Diameter of Liquid Pipe
Equivalent Refrigerant for
Pipe Length of 1m (kg/m)
Diameter of Liquid Pipe
Equivalent Refrigerant for
Pipe Length of 1m (kg/m)
Ф6. 4
0.024
Ф19. 1
0.284
Ф9. 5
0.063
Ф22. 2
0.399
Ф12. 7
0.126
Ф25. 4
0.546
Ф15. 9
0.189
Ф28. 6
0.714
Calculating formula (R410A):
The recharged volume: R (Kg) = (L1×0. 024 kg/m) + (L2×0. 063 kg/m) + (L3×0. 126 kg/m) + (L4×0.189
kg/m) + (L5×0. 284 kg/m) + (L6×0. 399 kg/m) + (L7×0. 546kg/m) + (L8×0.714kg/m)
L1: Actual total length
of Φ6.4 liquid pipe (m); L2: Actual total length of Φ9.5 liquid pipe (m);
L3:
Actual total length of Φ12.7 liquid pipe (m); L4: Actual total length of Φ15.9 liquid pipe (m);
L5:
Actual total length of Φ19.1 liquid pipe (m); L6: Actual total length of Φ22.2 liquid pipe (m);
L7:
Actual total length of Φ25.4 liquid pipe (m); L8: Actual total length of Φ28.6 liquid pipe (m)
