Connecting Refrigerant Pipes And Drain Pipes; Connecting Refrigerant Pipes - Mitsubishi Electric CMB-PW202V-J Installationshandbuch

4. Connecting refrigerant pipes and drain pipes

4.1. Connecting refrigerant pipes

1. Connect the liquid and gas pipes of each indoor unit to the same (correct) end
connection numbers as indicated on the indoor unit connection section of each
BC controller. If connected to wrong end connection numbers, there will be no
normal operation.
2. The pipe is connected via a terminal-branch type connection in which refriger-
ant piping from the BC controller is branched at the terminal and is connected
to each of the indoor units.
The method of pipe connection is as follows: flare connection for the indoor
units, gas pipes and liquid pipes for BC controller, brazed connection. Note that
the branched sections are brazed.
3. If the number of connected indoor units is less than the number of branch
holes, seal unused end connections using copper caps.
4. Be sure to use non-oxidative brazing where necessary. If you do not use non-
oxidative brazing, it may clog the pipes.
5. After completing pipe connection, support the pipes to ensure that load is not
imparted to the BC controller's end connections (particularly to the gas pipes
of indoor units).
6. Use a fitting if a specified refrigerant pipe has a different diameter from that of
a branching pipe.
7. Always observe the restrictions on the refrigerant piping (such as rated length,
height difference, and piping diameter) to prevent equipment failure or a de-
cline in heating/cooling performance.
Indoor twinning pipe set model
Line branch
Lower stream unit model
Lower stream unit model
More than 201 and less
Less than 200 in total
than 400 in total
CMY-Y102S-G2 CMY-Y102L-G2
1. Size of BC controller's end connection piping
[Fig. 4.1.1] (P.3)
Unit model Model name
PURY-(E) P200 (BC CONTROLLER)
PQRY-P200 CMB-PW202V-J
PURY-(E) P250
PQRY-P250
PURY-(E) P300
PQRY-P300
PURY-P350
Indoor unit side
A To outdoor unit
B End connection (brazing)
C BC controller
D Indoor unit
E PWFY unit
8
Lower stream unit model
More than 401 and less
than 650 in total
CMY-Y202-G2
BC CONTROLLER
High pressure
Low pressure
side
side
ø15.88*1 ø19.05*1
(Brazing) (Brazing)
ø22.2
ø19.05
(Brazing)
(Brazing)
ø28.58*1
(Brazing)
B or C B or C
(Brazing) (Brazing)
*1 Use the supplied pipe.
8. Branching cannot be made after header branching (corresponding parts are
marked with in the diagram below).
To BC controller
To BC controller
Warning :
When installing and moving the unit, do not charge it with refrigerant other
than the refrigerant (R410A) specified on the unit.
- Mixing of a different refrigerant, air, etc. may cause the refrigerant cycle to mal-
function and result in severe damage.
Caution:
• Use refrigerant piping made of phosphorus deoxidized copper and cop-
per alloy seamless pipes and tubes. In addition, be sure that the inner
and outer surfaces of the pipes are clean and free of hazardous sulphur,
oxides, dust/dirt, shaving particles, oils, moisture, or any other contami-
nant.
- R410A is a high-pressure refrigerant and can cause the existing piping to
burst.
• Store the piping to be used during installation indoors and keep both
ends of the piping sealed until just before brazing. (Store elbows and
other joints in a plastic bag.)
- If dust, dirt, or water enters the refrigerant cycle, deterioration of the oil and
compressor failure may result.
• Do not vent R410A into the atmosphere.
• R410A is a Fluorinated Greenhouse gas, covered by the Kyoto Protocol
with a Global Warming Potential (GWP) = 1975.
B, C, D, E
Å Total capacity of indoor units
~ 140
141 ~ 200
201 ~ 300
301 ~ 400
401 ~ 650
a, b, c, d, e, f, g
Î Model number ı Liquid pipe
20,25,32,40,50 ø6.35
63,71,80,100,125,140 ø9.52
200 ø9.52
250 ø9.52
‰ Downstream unit model total
~ 200
201 ~ 400
401 ~ 650
Ì 4-Branching header Ó 8-Branching header
(Downstream unit (Downstream unit
model total 200) model total
CMY-Y104-G CMY-Y108-G
Å Total capacity of indoor units
Ç Gas pipe
‰ Downstream unit model total
Ì 4-Branching header (Downstream unit model total
Ó 8-Branching header (Downstream unit model total
È 10-Branching header (Downstream unit model total
Note:
Be sure to use non-oxidative brazing.
CAP
(mm)
ı Liquid pipe Ç Gas pipe
ø9.52 ø15.88
ø9.52 ø19.05
ø9.52 ø22.2
ø12.7 ø28.58
ø15.88 ø28.58
(mm)
Ç Gas pipe
ø12.7
ø15.88
ø19.05
ø22.2
Ï Joint
CMY-Y102S-G2
CMY-Y102L-G2
CMY-Y202-G2
È 10-Branching header
(Downstream unit
400) model total 650)
CMY-Y1010-G
ı Liquid pipe
Î Model number
Ï Joint
200)
400)
650)