9 Piping work and
refrigerant charge
TCGB0070 rev.3 - 04/2012
112
9.1 Refrigerant piping
9.1.1
Refrigerant piping length
The refrigerant piping between the indoor unit and the outdoor unit should be designed using the following chart.
Keep the design point within the area of the chart, which is showing the applicable height difference according to piping
length.
Setting
before
shipment
When outdoor
unit is installed
higher than
indoor unit
When outdoor
unit is installed
lower than indo-
or unit
Height difference
(m)
Total length between outdoor unit
and each indoor unit.
Item
(2-10)HP
Maximum piping length (L)
Actual piping length
30
Equivalent piping length
40
Maximum height difference between indoor and
outdoor unit (H)
Outdoor unit higher than indoor unit
30
Indoor unit higher than outdoor unit
20
9.1.2 Refrigerant piping size
Piping connection size of outdoor unit & indoor unit
Outdoor unit
Pipe size
Indoor Unit
Pipe size
Gas pipe
Liquid pipe
Gas pipe
Liquid pipe
RAS-2HVRN2
Ø 12.7 (1/2”)(1*)
Ø 6.35 (1/4”)
RWM-2.0(H)FSN3E
Ø 15.88 (5/8”)(1*)
Ø 6.35 (1/4”)
RAS-3HVRNME-AF
Ø 15.88 (5/8”)
Ø 9.53 (3/8”)
RWM-3.0(H)FSN3E
Ø 15.88 (5/8”)
Ø 9.53 (3/8”)
RAS-4H(V)RNME-AF
Ø 15.88 (5/8”)
Ø 9.53 (3/8”)
RWM-4.0(H)FSN3E
Ø 15.88 (5/8”)
Ø 9.53 (3/8”)
RAS-5H(V)RNME-AF
Ø 15.88 (5/8”)
Ø 9.53 (3/8”)
RWM-5.0(H)FSN3E
Ø 15.88 (5/8”)
Ø 9.53 (3/8”)
RAS-6H(V)RNME-AF
Ø 15.88 (5/8”)
Ø 9.53 (3/8”)
RWM-6.0(H)FSN3E
Ø 15.88 (5/8”)
Ø 9.53 (3/8”)
RAS-8HRNME-AF
Ø 25.4 (1”)
Ø 9.53 (3/8”)
RWM-8.0(H)FSN3E
Ø 25.4 (1”)
Ø 9.53 (3/8”)
RAS-10HRNME-AF
Ø 25.4 (1”)
Ø 12.7 (1/2”)
RWM-10.0(H)FSN3E
Ø 25.4 (1”)
Ø 12.7 (1/2”)
N O T E
(1*): 2HP system only (RAS- RWM-2.0(H)FSN3E). If using different piping size for outdoor unit and in
-
door unit, a pipe adapter will be required: (Ø12.7 → Ø15.88).
The pipe adapter is factory supplied with the outdoor unit.
