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22 Series Multi-Zone
Refrigerant Piping Between the Indoor and Outdoor Units
All indoor units are individually connected to ports at the outdoor unit. (As shown below)
•
If any refrigerant ports are not connected to indoor units, please tighten the cap to seal off the
port. Paired ports are labeled A, B, C, D, and E.
•
During the connection of the indoor unit and the refrigerant pipe, never pull any joints of the
indoor unit by force, otherwise the pipes may crack which would then result in leakage.
•
The refrigerant pipe should be supported by brackets, don't let the unit withstand the weight
of the pipe length. If the piping connection size of the outdoor unit does not match the piping
connection size of the indoor unit, use the piping connection dimension of the indoor unit. Use
a connection joint that will accommodate the transition.
•
Each pipe should be labeled to tell which indoor system it belongs to avoid mistaken or
inaccurate piping connections.
Charging Instructions
Maximum total length
(a+b+c+d+e)
Maximum length to any
single indoor unit (Lx)
Minimum length to any
single indoor unit
Maximum height
difference between
outdoor unit and any
indoor unit *(H2)
Maximum height
difference between indoor
units (H2)
Maximum total pipe length
before adding charge is
required
Minimum total pipe length
before removing charge is
required
Amount of R410-A to add
or remove
Note: Refer to diagram on page 19.
4TXM2218 4TXM2221 4TXM2224 4TXM2230 4TXM2236 4TXM2242
ft
m
ft
m
66
20
197
60
33
10
66
20
10
3
10
3
33
10
33
10
33
10
33
10
33
10
98
30
33
10
49
15
oz/ft g/m
oz/ft
g/m
0.22
20
0.22
20
ft
m
ft
m
230
70
246
75
82
25
82
25
10
3
10
3
49
15
49
15
25
7.5
25
7.5
131
40
131
40
66
20
82
25
oz/ft g/m
oz/ft
g/m
0.22
20
0.22
20
18
ft
m
ft
m
246
75
246
75
82
25
82
25
10
3
10
3
49
15
49
15
25
7.5
25
7.5
131
40
131
40
98
30
98
30
oz/ft g/m
oz/ft g/m
0.24
20
0.24
20
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