Single-Zone Piping Limitations; Multi-Zone Piping Limitations - Lennox MPA009S4S Service Manual

7.6.

Single-Zone Piping Limitations

INDOOR UNIT
Maximum
Elevation -
Outdooor
Unit BELOW
Indoor Unit
Outside Unit BELOW 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.
System Size (KBtu)
009
012
018
024
036/048
7.7.

Multi-Zone Piping Limitations

Connecting Multiple Capacity
Indoor Units
Four-Zone System Example
Shown Above
Maximum Line Set
Length
OUTDOOR UNIT
Minimum Line Set
Length - 10 ft. (3m)
Line Set Diameters
(in.)
Liquid Gas
1/4 3/8
1/4 1/2
1/4 1/2
3/8 5/8
3/8 5/8
C(1/4in)
C(3/8in)
B(1/4in)
B(3/8in)
A(1/4in)
A(1/2in)
Maximum Line Set
Length
INDOOR UNIT
Outside Unit ABOVE Indoor Unit
IMPORTANT
Maximum Elevation
Outdoor Unit BELOW
Indoor Unit ft. (m)
40 ft. (12 m)
40 ft. (12 m)
66 ft. (20 m)
82 ft. (25 m)
98 ft. (30 m)
44
Minimum Line Set
Length - 10 ft. (3m)
OUTDOOR UNIT
Maximum
Elevation -
Outdooor
Unit ABOVE
Indoor Unit
Maximum Elevation
Outdoor Unit ABOVE
Indoor Unit ft. (m)
40 ft. (12 m)
40 ft. (12 m)
66 ft. (20 m)
82 ft. (25 m)
98 ft. (30 m)
Pipe and Wire Each Zone
Separately
outdoor
wire
A B C D
pipe
L4(ft)
Unit D
L3(ft)
Unit C
L2(ft)
Unit B
L1(ft)
Unit A
Maximum Line Set
Length
ft. (m)
82 ft. (25 m)
82 ft. (25 m)
98 ft. (30 m)
164 ft. (50 m)
213 ft. (65 m)
indoor
Unit D
Unit C
Unit B
Unit A