3
SYSTEM REQUIREMENTS
Allow sufficient space for airflow and servicing unit. See Fig. 14 through 19 for minimum required clearances.
Piping
IMPORTANT
:
Both refrigerant lines must be insulated separately.
Minimum refrigerant line length between the indoor and outdoor units is 10 ft. (3 m). The following maximum lengths are allowed:
Table 1—Maximum Piping Lengths
Outdoor Unit
System Size
18
24
30
36
42
48
56
Piping
Min. Piping Length
ft
10
10
10
10
10
10
10
Standard Piping Length
ft
32
98
131.2
131.2
131.2
98.42
98.42
Max. outdoor-indoor height difference
ft
33
33
49.2
49.2
49.2
98.42
98.42
Max. height distance between indoor and indoor
ft
33
33
24.6
24.6
24.6
49.21
49.21
Max. height distance between indoor and outdoor and indoor
ft
32
32
49.2
49.2
49.2
98.42
98.42
Max. height distance between indoor and outdoor and outdoor up
ft
33
33
49.2
49.2
49.2
98.42
98.42
Max. equivalent piping outdoor to last indoor
ft
33
65
82
82
82
229
229
Max. Piping Length with no additional refrigerant charge
ft
32
98
131.2
131.2
131.2
98.42
98.42
Max. Piping Length
ft
65
196
229.7
246
246
442.9
475.7
Gas Pipe (size - connection type)
in
3/8
3/8
3/8
3/8
3/8
5/8
5/8
Liquid Pipe (size - connection type)
in
1/4
1/4
1/4
1/4
1/4
3/8
3/8
Refrigerant
Refrigerant Type
R-410A R-410A R-410A R-410A R-410A R-410A R-410A
Heat Pump Models Charge Amount
Lbs
3.53
4.85
6.17
8.05
8.05
10.91
10.91
NOTE
: Tables 2 through 6 show the piping size specifications.
Table 2—Indoor High Wall
Indoor Unit Piping Connection Sizes
Indoor High Wall
(DLFAHH)
Size
9
12
18
Pipe Connection Size - Liquid
In.
1/4"
1/4"
1/4"
Pipe Connection Size - Suction
In.
1/2"
1/2"
5/8"
Table 3—Indoor High Wall
Indoor High Wall
(DLFBHB)
Size
9
12
18
24
Pipe Connection Size - Liquid
In.
1/4"
1/4"
1/4"
1/4"
Pipe Connection Size - Suction
In.
1/2"
1/2"
5/8"
5/8"
Table 4—Indoor Cassette
Indoor Cassette
Size
12
18
24
Pipe Connection Size - Liquid
In.
1/4"
1/4"
3/8"
Pipe Connection Size - Suction
In.
3/8"
1/2"
5/8"
Table 5—Indoor Ducted
Indoor Ducted
Size
9
12
18
21
24
Pipe Connection Size - Liquid
In.
1/4"
1/4"
1/4"
3/8"
3/8"
Pipe Connection Size - Suction
In.
3/8"
3/8"
1/2"
5/8"
5/8"
Table 6—Indoor Floor Console
Indoor Floor Console
Size
9
12
18
Pipe Connection Size - Liquid
In.
1/4"
1/4"
1/4"
Pipe Connection Size - Suction
In.
3/8"
3/8"
1/2"
Refrigerant Piping:
Line sets to be sized based on the connection size of the indoor unit. Each pipe to be insulated individually.
Conversion Joints:
The outdoor unit may include a package of conversion joints to facilitate installation of various sizes of fan coils. These joints are to be
connected to the outdoor unit as needed to match the line set size.
Table 7—Additional Refrigerant Charge
Total Line
Length ft
Additional Charge, 1/4” Liquid Line / 3/8” Liquid Line, oz/ft. ft (m)
Unit
Size
Min
Max
10 - 32
(3 - 10)
>32 - 66
(10 - 20)
>66 - 98
(20 - 30)
>98 - 131.2
(30 - 40)
>131.2 - 196
(40 - 60)
>196 - 230
(60 - 70)
>230 - 246
(70 - 75)
>246 - 443
(75 - 135)
>443 - 476
(135 - 145)
18
10
66
None
0.20 / 0.20
24
10
196
None
None
0.20 / 0.20
0.20 / 0.20
30
10
230
None
None
None
0.24 / 0.58
0.24 / 0.58
36
10
246
None
None
None
0.24 / 0.58
0.24 / 0.58
0.24 / 0.58
42
10
246
None
None
None
0.24 / 0.58
0.24 / 0.58
0.24 / 0.58
48
10
443
None
None
0.24 / 0.58
0.24 / 0.58
0.24 / 0.58
0.24 / 0.58
0.24 / 0.58
56
10
476
None
None
0.24 / 0.58
0.24 / 0.58
0.24 / 0.58
0.24 / 0.58
0.24 / 0.58
0.24 / 0.58
Additional Refrigerant Calculation Sizes 30K, 36K and 42K:
Sum Total Liquid Pipe 1/4” (ft) x 0.24 + Sum Total Pipe 3/8” (ft) x 0.58 – 31 oz
Additional Refrigerant Calculation Sizes 48K and 56K:
Sum Total Liquid Pipe 1/4” (ft) x 0.24 + Sum Total Pipe 3/8” (ft) x 0.58 – 51.7 oz
NOTE
: If the calculation results in a negative number no additional refrigerant is required.
NOTES
:
EXV = Electronic Expansion Device
Electronic expansion valves in the outdoor unit are used as metering devices.