7
Figures 10 and 11 and Tables 6 and 7 show allowable piping lengths and elevation differentials when connecting the outdoor units to
indoor units.
Table 6 — Permitted Pipe Lengths and Drop Heights
* Branch joints are field supplied.
NOTE: When the length "L1" is greater than 230 ft, the gas pipe
should be increased from 5/8 in to 3/4 inch or from 3/4 in to 7/8 inch.
The pipe adapter must be as close as possible to ODU.
Fig. 11 —Branch Joint Layout
Table 7 — Connection Method
BRANCH JOINT INSTALLATION — The branch joint
must be installed parallel to the ground; the angle of the joint
should not be greater than 10 degrees. Positioning the branch
joint more than 10 degrees from parallel can cause
malfunctions. See Fig. 12 for correct positioning of the joint.
Fig. 12 —Correct Branch Joint Positioning
Install the branch joints properly to avoid oil accumulating in
the system.
DESCRIPTION ALLOWABLE VALUE (ft) PIPES
Piping Length
Total Pipe Length ≤ 492
L1 + L2 + L3 + L4 + L5 + L6 + A +
B + C + D + E
Maximum Piping Length (L)
Actual Length ≤ 296
L1 + L3 + L4 + L5 + L6 + E
Equivalent Length ≤ 328
First Branch to Farthest Indoor Unit ≤ 131 L3 + L4 + L5 + L6 + E
Height
Difference
Indoor Unit to Outdoor Unit
Outdoor Unit Above ≤ 164 —
Outdoor Unit Below ≤ 131 —
Indoor Unit to Indoor Unit ≤ 49 —
First Branch to Farthest Indoor Unit* ≤ 49 —
Fig. 10 — Piping Lengths and Drop Height
UNIT TYPE SUCTION SIDE LIQUID SIDE
Outdoor Unit Flaring Flaring
Indoor Unit Flaring Flaring
Branch Pipe Brazing or Flaring Brazing or Flaring
LEGEND
1 — Main outdoor pipe, from outdoor unit to first branch pipe.
2 — Main indoor pipe, from branch pipe to first branch pipe.
3 — Branch pipe, from branch pipe to indoor unit.
◄
— Branch joint.
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