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Pipe Selection; Twinning Kit Selection - Mitsubishi Electric City Multi R2 Series Installation Manual

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9-2. Pipe selection

Use refrigerant piping made of phosphorus deoxidized copper (copper and copper alloy
seamless pipes) that meets local requirements. Pipe joints should also meet local
requirements. Keep the inner and outer surfaces of the pipes clean and free of sulphur,
oxides, dust/dirt, shaving particles, oils, moisture, or any other contaminants.
- Contaminants on the inside of the refrigerant piping will cause the refrigerant oil to deteriorate
and cause the compressor to malfunction.
Use refrigerant pipes for use with R410A refrigerant system. Piping for systems for use with other types of refrigerants
may not be able to be used.
Use refrigerant pipes with the thicknesses specified in the table below.
Size [mm (in)]
Radial thickness [mm (mil)]
ø6.35 (ø1/4)
ø9.52 (ø3/8)
ø12.7 (ø1/2)
ø15.88 (ø5/8)
ø19.05 (ø3/4)
ø22.2 (ø7/8)
ø25.4 (ø1)
ø28.58 (ø1-1/8)
ø31.75 (ø1-1/4)
ø34.93 (ø1-3/8)
ø41.28 (ø1-5/8)

9-3. Twinning kit selection

Select appropriate twinning kits (sold separately), referring to the sections below.
* Use an adapter, if necessary, to connect a refrigerant pipe to a twinning pipe of a different diameter.
9-3-1. 2-Branch Joint Pipe
A 2-Branch Joint Pipe is used to connect multiple indoor units to a port.
(1) R2 system
Total capacity of downstream indoor units
200 or below
201 to 250
(2) Hybrid City Multi system
・Connect the pipes on site, referring to the HBC controller Installation Manual.
・CMY-Y102SS-G2 is used in an R2 system, and cannot be used in a Hybrid City Multi system.
9-3-2. Joint Pipe Kit
A Joint Pipe Kit is used to connect an indoor unit of P100 model or above.
(1) R2 system
Indoor unit model
P100 to P250
* When connecting P100 through P250 models of indoor units to two ports, set the dipswitch SW4-6 on the BC controller to ON.
* When including only PEFY-P50/63/71/80/100VMHS2-E units, connect the two ports and set the dipswitches SW4-1 and SW4-6 on the BC
controller to ON.
* When connecting PEFY-P50/63/71/80/100VMHS2-E units to two ports, use a Joint Pipe Kit CMY-R160-J1.
* Although using a single port is possible, cooling performance will somewhat decrease. When connecting P100 through P140 models of indoor
units or PEFY-P50/63/71/80/100VMHS2-E units to a single port, set the dipswitches SW4-1 and SW4-6 to OFF.
(2) Hybrid City Multi system
・Connect the pipes on site, referring to the HBC controller Installation Manual.
・CMY-R160-J1 is used in an R2 system, and cannot be used in a Hybrid City Multi system.
WT08432X01
Type
0.8 (32)
Type-O
0.8 (32)
Type-O
0.8 (32)
Type-O
1.0 (40)
Type-O
1.2 (48)
Type-O
1.0 (40)
Type-1/2H or H
1.0 (40)
Type-1/2H or H
1.0 (40)
Type-1/2H or H
1.0 (40)
Type-1/2H or H
1.1 (44)
Type-1/2H or H
1.2 (48)
Type-1/2H or H
1.4 (56)
Type-1/2H or H
Kit model
CMY-Y102SS-G2
CMY-Y102LS-G2
Kit model
CMY-R160-J1
GB-22

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