10
■Refrigerant piping design
•Allowable length/height difference of refrigerant piping
Piping specification items
Dx-Interface
connection
(More than 8ton)
Dx-Interface
connection
(8ton or less)
Total extension (Liquid pipe, Actual length)
Standard VRF
outdoor unit
piping limitations
based on model
selection apply
Furthest piping length (L)
Furthest equivalent piping length from the first
branching section (Li)
Furthest equivalent piping length between outdoor units (LO)
Maximum equivalent length of outdoor unit connecting pipe
Maximum actual length of pipes connected to indoor units
Maximum equivalent length between branching sections
Height between outdoor and
indoor units H1
Height between indoor unit (H2)
Height between outdoor units (H3)
FS unit
connection
(SHRM-e
only)
Maximum equivalent length indoor units in group control by one
single port Flow Selector unit (Ln)
Standard VRF
outdoor unit
piping limitations
based on model
selection apply
Maximum real length between Flow
Selector unit and indoor unit
Height difference between indoor units in group control by one
Flow Selector unit (H4)
(*1) Follow the piping design specification of outdoor units.
Power supply
wiring (L1/L2/G)
Communication wring
(U1/U2, A/B)
Digital input /
Analogue input wiring
PMV (pulse motor valve) wiring
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