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9-5-2. Connecting pipes
・The refrigerant pipe from the outdoor unit is branched at the pipe end, and each branch is then connected to an
indoor unit.
Gas pipe
Outdoor unit
Liquid pipe
Branched section
・Refer to section 5 "Package contents" for details about the supplied connecting pipes.
・When connecting pipes, make sure the service valves are completely closed.
・Commercially available pipes often contain dust or debris. Always blow them clean with a dry inert gas.
・Take care to prevent dust, water or other contaminants from entering the pipes during installation.
・Reduce the number of bending portions as much as possible, and make the bending radius as big as possible.
・Do not use any commercially available anti-oxidizing agents since they may cause pipe corrosion and degrading of
the refrigerant oil. Please contact MITSUBISHI ELECTRIC HYDRONICS & IT COOLING SYSTEMS S.p.A. for more
details.
・Make sure that the pipes are not in contact with each other, unit panels, or base plates.
(1) When routing the pipes through the front of the unit
<A>
<B>
<A> Liquid side
<B> Gas side
Refrigerant service valve piping
Ⓐ
・Connecting the on-site piping and the service valve piping
When routing the pipes through the front of the unit
Use the supplied connecting pipe ①.
When routing the pipes through the bottom of the unit
Expand the end of the on-site piping. (ID ø15.88 mm (ø5/8 in))
<Reference> Size of refrigerant pipes
On-site piping [mm (in)]
Liquid
ø15.88 (ø5/8)
ø28.58 (ø1-1/8)
<Reference> Severed section
Ⓐ
Ⓑ
Ⓒ
Ⓐ
Ⓒ
Ⓑ
VG79D920H01
Connecting method
Brazed
Brazed
Brazed
Ⓐ
Liquid side
Liquid side
Service valve piping [mm (in)]
Gas
Liquid
ø15.88 (ø5/8)
75 mm (3 in) (reference)
Pipe section to be cut (Use a pipe cutter.)
Service valve side
(2) When routing the pipes through the bottom of the unit
<A>
<B>
Gas side
Use the supplied connecting elbow ②.
Gas side
Expand the end of the on-site piping. (ID ø28.58 mm (ø1-1/8 in))
Gas
ø28.58 (ø1-1/8)
21
Ⓐ
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