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OTHER CONSIDERATIONS
CONFIGURATION OF CONNECTION PIPE
• Standard length of connection pipe: 25 ft. (7.5 m).
• Minimum length of connection pipe: 10 ft. (3 m).
• Maximum length of connection pipe and maximum height difference:
Cooling capacity
BTU/hr (W)
Maximum length
of connection pipe
ft. (m)
Maximum height
difference
ft. (m)
9000 (2637) 49 (15) 33 (10)
12000 (3516) 66 (20) 33 (10)
18000 (5274) 82 (25) 33 (10)
24000 (7032) 82 (25) 33 (10)
Additional refrigerant liquid and refrigerant charge required after extending connection pipes
• The calculation method of additional refrigerant charge (on the basis of liquid pipe) is:
Additional refrigerant charge (oz) = extended length of liquid pipe (ft.) x 0.2
• Based on the length of standard pipe and depending on pipe diameter, add refrigerant as per
following chart.
Additional refrigerant charge for R410A
Diameter of connection pipe Outdoor unit throttle
Liquid pipe
(mm)
Gas pipe
(mm)
Cooling only
(g/m)
Cooling and heating
(g/m)
Φ 6 Φ 9.52 ou Φ 12 15 20
Φ 6 ou Φ 9.52 Φ 16 ou Φ 19 15 50
Φ 12 Φ 19 ou Φ 22.2 30 120
Φ 16 Φ 25.4 ou Φ 31.8 60 120
Φ 19 - 250 250
Φ 22.2 - 350 350
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