Part 3 - S
yst
em Design and Ins
talla
tion
Amazon Unitario Top Discharge
149
Table 3-4.5: Main pipe
1
(L
1
) and first indoor branch joint (A)
Capacity of
outdoor unit
Equivalent length of all liquid pipes < 90m
Equivalent length of all liquid pipes ≥ 90m
Gas pipe (mm)
Liquid pipe (mm)
Branch joint kit
Gas pipe (mm)
Liquid pipe (mm)
Branch joint kit
8HP
Φ19.1
Φ9.53
KCMI 212
Φ22.2
Φ12.7
KCMI 212
10HP
Φ22.2
Φ9.53
KCMI 212
Φ25.4
Φ12.7
KCMI 212
12-14HP
Φ25.4
Φ12.7
KCMI 212
Φ28.6
Φ15.9
KCMI 312
16HP
Φ28.6
Φ12.7
KCMI 312
Φ31.8
Φ15.9
KCMI 312
18-24HP
Φ28.6
Φ15.9
KCMI 312
Φ31.8
Φ19.1
KCMI 312
26-32HP
Φ31.8
Φ19.1
KCMI 312
Φ38.1
Φ22.2
KCMI 412
Notes:
1. The main pipe (L1) and first indoor branch joint (A) should be sized according to whichever of Tables 3-4.4 and 3-4.5 indicates the larger size.
Table 3-4.6: Indoor auxiliary pipes (a to j)
Capacity of indoor unit
(kW)
Pipe length ≤ 10m
Pipe length > 10m1
Gas pipe (mm)
Liquid pipe (mm)
Gas pipe (mm)
Liquid pipe (mm)
≤ 4.5
Φ12.7
Φ6.35
Φ15.9
Φ9.53
≥ 5.6
Φ15.9
Φ9.53
Φ19.1
Φ12.7
Notes:
1. An indoor auxiliary pipe should not be larger than the indoor main pipe immediately upstream of it. For indoor auxiliary pipes
greater than 10m in length with indoor units of capacity great than or equal to 5.6kW, the gas and liquid side pipes should each
either be sized according to this table, or else be the same size as the indoor main pipe immediately upstream, whichever is
smaller.