Aisin AXGP224E1, Technical Manual, Page: 14 / 126

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1.6 Outline diagram of refrigerant piping
1.7 Refrigerant piping installation specifications
Outdoor Unit
Item
Refrigerant main piping diameter
(mm)
Permissible piping
length (m)
Equivalent length/
Actual length
Permissible height
difference (m)
Refrigerant
oil
Vapor line Liquid line
Outdoor unit is
higher
Outdoor
unit is lower
P224
ø19.1
*1(ø22.2)
ø9.5
*1(ø12.7)
190
/165
*2
50 40 NL10
P280
ø22.2
*1(ø25.4)
ø9.5
*1(ø12.7)
P355
ø25.4
*1(ø28.6)
ø12.7
*1(ø15.9)
ATTENTION
∗
If the piping length exceeds 100 m, install pipes larger by one rank specified in ( ).
∗∗
When total capacity of connected indoor unit exceeds 130 % of rated capacity, restrict the
permissible piping length (actual length) to 100 m or less.
Refrigerant liquid pipe (brazing)
Brazing connections
Indoor unit Indoor unit
Branch pipes or helders
(sold separatly)
Outdoor unit
Fuel gas pipe R ¾’’
Refrigerant capor line (brazing)
Condensation water drain port
Exhaust gas
water drain port
Flare connections