Pipe Selection; Twinning Kit Selection - Mitsubishi Electric CITY MULTI PURY-P-ZKMU-A Installation Manual

(3) The vertical separation between units (H) must be 0.1 m (3-15/16 in) or below. In the figure on the right, because the distance is more than
0.1 m (3-15/16 in), the oil accumulates in Unit 1 when Unit 2 is in operation and Unit 1 is stopped.
Unit 2
Unit 1 Unit 1
Ⓐ
H
(4) The vertical separation between units (H) must be 0.1 m (3-15/16 in) or below. In the figure on the right, because the distance is more than
0.1 m (3-15/16 in), the oil accumulates in Unit 2 when Unit 1 is in operation and Unit 2 is stopped.
Unit 1 Unit 1
Unit 2
H
Ⓐ
・
Ⓐ
・Do not install traps to prevent oil backflow and compressor start-up failure.

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.
* The maximum number of connectable ports is 48.
9-3-1. 2-Branch Joint Pipe
A 2-Branch Joint Pipe is used to connect multiple indoor units to a port, or to connect two sub BC controllers.
Total capacity of downstream indoor units
30 or below
9-3-2. Joint Pipe Kit
A Joint Pipe Kit is used to connect an indoor unit of P100 model or above.
Indoor unit model
P36 to P96
WT07828X01
Unit 1
Ⓐ
Unit 1
Ⓐ
H
Ⓐ
Twinning Kit
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
Kit model
CMY-R160C-J1
Unit 2
H
H > 0.1 m (3-15/16 in)
Unit 2
H > 0.1 m (3-15/16 in)
GB-14