Connecting Refrigerant Pipes And Drain Pipes; Connecting Refrigerant Pipes - Mitsubishi Electric CITY MULTI CMB-P-V-E Serie Manuel D'installation

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 end
connection numbers as indicated on the indoor unit flare connection
section of each BC controller. If connected to wrong end connection
numbers, there will be no normal operation.
2. List indoor unit model names in the name plate on the BC controller
control box (for identification purposes), and BC controller end con-
nection numbers and address numbers in the name plate on the
indoor unit side.
3. If the number of connected indoor units is less than the number of
branch holes, it does not matter which end connections you leave.
Seal unused end connections using flare nuts with end caps just as
they were capped when shipped from the factory. No end cap means
refrigerant leakage.
4. When using branch pipes (CMY-Y102S-F), be sure to connect them
at level.
5. Be sure to tighten the flare nuts using a double spanner. Otherwise
the refrigerant may leak.
6. Be sure to use non-oxidative brazing where necessary. If you do not
use non-oxidative brazing, it may clog the pipes.
7. After completing pipe connection, support the pipes to prevent that
load is imparted to the BC controller's end connections (particularly
to the gas pipes of indoor units).
A
3
- 6
5 0
3 2
4 0
5 0
4 0
A Example of connecting refrigerant pipes to BC controllers
B To outdoor unit
C Reducer (supplied with BC controller)
D Gas pipe
E Liquid pipe
F Combined piping kit CMY-R160-F (optionally available)
G Branch pipe CMY-Y102S-F (optionally available)
H Pipe support (field supply)
8
B
C
D
E
F
H
G
5
1 2
0 ,
1 0
Warning :
When installing and moving the unit, do not charge it with refriger-
ant other than the refrigerant (R407C or R22) specified on the unit.
- Mixing of a different refrigerant, air, etc. may cause the refrigerant cy-
cle to malfunction and result in severe damage.
Caution:
• Use refrigerant piping made of C1220 (CU-DHP) phosphorus
deoxidized copper as specified in the JIS H3300 "Copper and
copper 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 contaminant.
• Never use existing refrigerant piping.
- The large amount of chlorine in conventional refrigerant and refrig-
erator oil in the existing piping will cause the new refrigerant to
deteriorate.
• Store the piping to be used during installation indoors and keep
both ends of the piping sealed until just before brazing.
- If dust, dirt, or water gets into the refrigerant cycle, the oil will dete-
riorate and the compressor may fail.
• Use Suniso 4GS or 3GS (small amount) refrigerator oil to coat
the flare and flange connection part. (For models using R22)
• Use ester oil, ether oil or alkylbenzene (small amount) as the
refrigerator oil to coat flares and flange connections. (For mod-
els using R407C)
- The refrigerant used in the unit is highly hygroscopic and mixes
with water and will degrade the refrigerator oil.
1. Size of BC controller's end connection piping
Piping portion High pressure
Item (liquid) side
PURY-200YMF-B
PURY-P200YMF-B
PURY-250YMF-B
PURY-P250YMF-B
Indoor unit side ø9.52 (Flare)
A B
C
G
*2
D
*1
E E E
F
*4 50-63 125
A To outdoor unit
B End connection
High pressure side: flare
Low pressure side: flange (accessory)
C BC controller
D Reducer (accessory)
E Indoor unit
F Less than 40
G Combined piping kit (Model name: CMY-R160)
H Branch pipe (Model name: CMY-Y102S-F)
I Up to three units for1 branch hole; total capacity: below J80 (but same in
cooling/heating mode)
The size of BC controller's branch hole piping is for 50 to 63 type indoor
units.
Therefore, if you want to connect indoor units other than the above, do
pipe connection following the procedure below.
(Unit: mm)
Low pressure
(gas) side
ø19.05 ø25.4 (Flange)
(Flare) ø28.58 (Flange)
ø15.88 (Flare)
H
E E
I
*3
E