67 Check if the piping installation is according to standards, that there no fractures or damages and that liquid and gas pipe have separate insulation Verify pipe thickness Outside diameter (mm) Material Thickness (mm) 6.4 o 0.8 9.5 o 0.8 12.7 o 0.8 15.9 o 1.0 19.1 1/2H 1.0 o: annealed - 1/2H: half hard Verify piping diameter Liquid 6.4 9.5 12.7 Gas 9.5 12.7 15.9 12.7 15.9 19.1 22.2 25.4 15.9 19.1 22.2 25.4 Sky Air 3.5kW x x x x x x x x x x x 5.0kW ∆ o ∆ ∆ x x x x x x x 6.0kW ∆ o ∆ ∆ x x x ∆ x x x 7.1kW x ∆ ∆ x x x x ∆ x x x 10.0-14.0kW x x ∆ x o x x ∆ ∆ x x 20.0-25.0kW x x x x x x o x x ∆ ∆ Verify the piping length Liquid pipe (mm) 35 50 60 71 100 125-140 200-250 Chargeless (equivalent) 6.4 30 (40) m 30 (40) m 30 (40) m 10 / (15) m N/A 9.5 - 15 (20) m 15 (20) m 40 / (50) m N/A 12.7 - - 10 (15) m 15 / (20) m N/A Max. total length (equivalent) 6.4 50 (65) m 50 (65) m 50 (65) m 10 / (15) m N/A 9.5 - 25 (35) m 25 (35) m 55 / (75) m 85 / (100) m 100 m 12.7 - - 10 (15) m 25 / (35) m 35 / (45) m 50 m Check if any operation history affects the ability to re-use the pipes(systems with a pipe length up to 35m, can always re-use exisiting pipe work when using a new Sky Air A-series model) System to be replaced System condition Piping length R-32 Sky Air A-series R-22 (mineral oil) Unit is operating (pump down can be performed) No restrictions Pump down operation impossibility or compressor malfunction Below 35 m Above 35 m o R-410A (synthetic oil) Unit is operating (pump down can be performed) No restrictions Pump down operation impossibility or compressor malfunction Below 35 m Above 35 m o R-32 (synthetic oil) Unit is operating (pump down can be performed) No restrictions Pump down operation impossibility or compressor malfunction Below 35 m Above 35 m o Cleaning-free piping re-use o Cleaning of field piping or replacement of field piping is required The Flare connection MUST be redone by using the flare nut included with the new outdoor unit How does it work? New simplified replacement procedure with Sky Air A-series outdoor units 1 Evaluate if the pipe work can be re-used 2 Evaluate if the wiring can be re-used Check if the wiring meets current standard and the specificaton of the new unit and that there is no damage or scratches Possible (Standard condition) o Possible (With no impact on chargeless length and total length) ∆ Possible (With impact on chargeless length and total length) x Impossible note: For general installation guidelines and requirements please check the installation manual of the specific outdoor model
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