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11.7. Single-Zone Piping Limitations
OUTDOOR UNIT
OUTDOOR UNIT
INDOOR UNIT
INDOOR UNIT
Maximum Line Set
Length
Maximum Line Set
Length
Maximum
Elevation -
Outdooor
Unit BELOW
Indoor Unit
Maximum
Elevation -
Outdooor
Unit ABOVE
Indoor Unit
Minimum Line Set
Length - 10 ft. (3m)
Minimum Line Set
Length - 10 ft. (3m)
Outside Unit BELOW Indoor Unit
Outside Unit ABOVE Indoor Unit
Do not allow for excess length of line sets to be left rolled up as part of the
required distance, or in general. This will also cause additional performance issues.
IMPORTANT
System Size (KBtu)
Line Set Diameters
(in.)
Maximum Elevation
Outdoor Unit BELOW
Indoor Unit ft. (m)
Maximum Elevation
Outdoor Unit ABOVE
Indoor Unit ft. (m)
Maximum Line Set
Length
ft. (m)
Liquid
Gas
009
1/4
3/8
40 ft. (12 m)
40 ft. (12 m)
82 ft. (25 m)
012
1/4
1/2
40 ft. (12 m)
40 ft. (12 m)
82 ft. (25 m)
018
1/4
1/2
66 ft. (20 m)
66 ft. (20 m)
98 ft. (30 m)
024
3/8
5/8
82 ft. (25 m)
82 ft. (25 m)
164 ft. (50 m)
030
3/8
5/8
82 ft. (25 m)
82 ft. (25 m)
164 ft. (50 m)
036/048 and 3PB-036
3/8
5/8
98 ft. (30 m)
98 ft. (30 m)
213 ft. (65 m)
11.8. Multi-Zone Piping Limitations
A(1/2in)
A(1/4in)
B(3/8in)
B(1/4in)
C(3/8in)
C(1/4in)
Connecting Multiple Capacity
Indoor Units
Four-Zone System Example
Shown Above
A B C D
Unit D
Unit D
Unit C
Unit B
Unit A
Unit C
Unit B
Unit A
wire
pipe
outdoor
indoor
L4(ft)
L3(ft)
L2(ft)
L1(ft)
Pipe and Wire Each Zone
Separately
