HTW -FST3-O-160A9 Manual De Usuario E Instalacion página 41

Configuration of connection pipe
Additional refrigerant charging amount for R22, R407C, R410A and R134a
Diameter of connection pipe
Liquid pipe(mm)
Φ6
Φ6 or Φ9.52
Φ12
Φ16
Φ19
Φ22.2
5. If the outdoor unit is higher than the indoor unit for more than 5m, an oil return
bend is needed.
indoor unit
Gas pipe(mm)
Φ9.52 or Φ12
Φ16 or Φ19
Φ19 or Φ22.2
Φ25.4 or Φ31.8
_
_
outdoor unit
Below 5m
Outdoor unit throttle
Cooling only(g/m) Cooling and heating(g/m)
15
15
30
60
250
350
oil return bend
indoor unit
39
20
50
120
120
250
350
outdoor unit
Above 5m