Mitsubishi Electric PURY-EP200YLM-A, Service Handbook

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[2-10 Restrictions on Refrigerant Pipes ]
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HWE1314A GB
(3) Size of the pipe that fits the sub BC controller ports
The ports of the BC controller accommodates the pipes on P63-P140 models of indoor units. To connect other types of indoor
units, follow the procedure below.
1) To connect P15-P50 models of indoor units use the reducer that is supplied with the BC controller.
2) To connect the units between the P100 and P250 models of indoor units (or when the total capacity of indoor units is
P81 or above), use a junction pipe kit and merge the two nozzles.
3) To connect multiple indoor units to a port (or to a junction pipe)

Maximum total capacity of connected indoor units: P80 or below (in a system with a junction pipe: P250 or below)

Maximum number of connectable indoor units: 3 units

Branch joint: Use CMY-Y102S-G2 (optional accessory).

Refrigerant pipe selection (size of the pipes in sections A and B in the figure above): Select the proper based on the total
capacity of the downstream indoor units, using the table below as a reference.
Select the proper size pipes for the main unit based on the total capacity of the indoor units that are connected to both sub
BC controllers. Select the proper size pipes for the sub controller side based on the total capacity of the indoor units that are
connected to the sub controller.
Unit : mm [inch]
Total capacity of indoor units Liquid pipe Gas pipe
P140 or below ø9.52 [3/8"] ø15.88 [5/8"]
P141 - P200 ø9.52 [3/8"] ø19.05 [3/4"]
P201 - P250 ø9.52 [3/8"] ø22.2 [7/8"]
A B
Indoor Indoor Indoor
P50 model or below P63-P80 models P100-P250 models
Note 2
Junction pipe kit
(Model name:
CMY-R160-J1)
(Optional accessory)
BC controller (sub)
To Main BC controller
Connection: Brazed connection
Note 1
Reducer
(Standard supplied parts)
Maximum of 3 units per port
Total capacity of P80 or below
(All units connected to the same port
must be in the same operating mode.)
Note 3
Note 4
Indoor Indoor Indoor
Branch joint (Model name:CMY-Y102S-G2)
(Optional accessory)
Group the indoor units together that connected to the same port if multiple indoor units are connected to the
same port on BC controller. Also share one thermo-stat such as on remote controller so that they turn on/off
at the same time.
Note 4
Unit : mm [inch]
Operation Pipe sections
Total capacity of the indoor
units that are connected to
the BC controller
Liquid pipe side
High-pressure side
(liquid)
Low-pressure side
(gas)
Main BC controller side - P200 ø9.52 [3/8"]
(Brazed connection)
ø15.88 [5/8"]
(Brazed connection)
ø19.05 [3/4"]
(Brazed connection)
P201 - P300
ø9.52 [3/8"]
(Brazed connection)
ø19.05 [3/4"]
(Brazed connection)
ø22.2 [7/8"]
(Brazed connection)
P301 - P350
ø12.7 [1/2"]
(Brazed connection)
ø19.05 [3/4"]
(Brazed connection)
ø28.58 [1-1/8"]
(Brazed connection)
P351 - P400
ø12.7 [1/2"]
(Brazed connection)
ø22.2 [7/8"]
(Brazed connection)
ø28.58 [1-1/8"]
(Brazed connection)
P401 - P500
ø15.88 [5/8"]
(Brazed connection)
ø22.2 [7/8"]
(Brazed connection)
ø28.58 [1-1/8"]
(Brazed connection)