Refrigerant Piping Work - Mitsubishi Electric CITY MULTI CMB-P104V-G1 Manuel D'installation

6. Be sure to use non-oxidative brazing where necessary. If you do not use non-
oxidative brazing, it may clog the pipes.
While under a nitrogen purge, braze the indoor unit connecting port before
brazing the outdoor unit connecting port of BC controller.
When brazing the indoor unit connecting port, supply a nitrogen gas into the
outdoor unit connecting port of BC controller.
When brazing the outdoor unit connecting port of BC controller, supply a nitrogen
gas into the pipe between the outdoor unit and BC controller.
7. 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).
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.
1. Size of BC controller's end connection piping
[Fig. 4.1.2] (P.5)
BC CONTROLLER/MAIN BC CONTROLLER
Unit model Model name
(BC CONTROLLER)
PURY-(E) P200
PQRY-P200 CMB-P104V-G1
CMB-P105V-G1
PURY-(E) P250
PQRY-P250 CMB-P106V-G1
CMB-P108V-G1
PURY-(E) P300
CMB-P1010V-G1
PQRY-P300
CMB-P1013V-G1
CMB-P1016V-G1
PURY-P350
PURY-(E) P400
PQRY-P400
(MAIN BC
PURY-(E) P450
CONTROLLER)
PQRY-P450
CMB-P108V-GA1
PURY-(E) P500
CMB-P1010V-GA1
PQRY-P500
CMB-P1013V-GA1
PURY-(E) P550
CMB-P1016V-GA1
PQRY-P550
PURY-(E) P600
PQRY-P600
PURY-P650
PURY-P700 (MAIN BC
PURY-P750
CONTROLLER)
PURY-P800 CMB-P1016V-HA1
Indoor unit side
A To outdoor unit (MAIN BC CONTROLLER)
B End connection (brazing)
C BC controller (MAIN BC CONTROLLER/SUB BC CONTROLLER)
D Reducer
F Less than 50
G Combined piping kit (Model name: CMY-R160-J1)
H Twinning pipe (Model name: CMY-Y102S-G2)
I Up to three units for 1 branch hole; total capacity: below 80 (but same in cooling/
heating mode)
The size of BC controller's branch piping is for 63 to 140 type indoor units.
Therefore, if you want to connect indoor units other than the above, connect piping
following the procedures below.
*1. For connecting 15 to 50 type indoor units
Have pipe expansion of indoor unit connecting port by cutting the piping at the
cutting point which depends on the indoor unit capacity.
Note:
Remove burr after cutting the piping to prevent entering the piping.
Check that there is no crack at the pipe expansion part.
*2. To connect a unit with a capacity of higher than 81.
After combining two branches using an optionally available piping kit (CMY-R160-
J1), connect indoor units.
*3. Connection of plural indoor units with one connection (or joint pipe)
• Total capacity of connectable indoor units: Less than 80 (Less than 250 with
joint pipe)
• Number of connectable indoor units: Maximum 3 Sets
• Twinning pipe: Use the twinning pipe for CITY MULTI Y Series (CMY-Y102S-
G2)
• Selection of refrigerant piping
Select the size according to the total capacity of indoor units to be installed
downstream.
Total capacity of indoor units
Below 140
141 to 200
201 to 250
High pressure Low pressure
side side
ø15.88*1 ø19.05*1
(Brazing) (Brazing)
When a system that has more than 16 branching points, use BC controllers (main and
sub) to connect the pipes.
ø22.2
ø19.05
(Brazing)
(Brazing)
ø28.58*1
(Brazing)
ø19.05*1
(Brazing)
ø22.2
(Brazing)
ø28.58
(Brazing) CMB-P104V-GB1
CMB-P108V-GB1
ø28.58*1
CMB-P1016V-HB1
(Brazing)
ø34.93*1
ø28.58
(Brazing)
(Brazing)
ø9.52 or ø6.35 ø15.88 or ø12.7
(Brazing) (Brazing)
E
Indoor unit
Liquid line Gas line
ø15.88
ø9.52 ø19.05
ø22.2
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 contaminant.
- 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.
• Apply a small amount of ester oil, ether oil, or alkyl benzene to flares. (for
indoor unit)
- Infiltration of a large amount of mineral oil may cause the refrigerant oil to
deteriorate.
• 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.
SUB BC CONTROLLER
Total capacity High pressure
Model name
of indoor units
below 200
201~300
301~350
351~400
401~450
ø9.52 or ø6.35
Note:
Be sure to use non-oxidative brazing.

4.2. Refrigerant piping work

After connecting the refrigerant pipes of all indoor and outdoor units with the out-
door units' stop valves remained fully closed, evacuate vacuum from the outdoor
units' stop valve service ports.
After completing the above, open the outdoor units' stop valves. This connects the
refrigerant circuit (between outdoor and BC controller) completely.
How to handle stop valves is described on each outdoor unit.
Notes:
• After pipe connection, be sure to check that there is no gas leakage,
using a leak detector or soap-and-water solution.
• Before brazing the refrigerant piping, always wrap the piping on the main
body, and the thermal insulation piping, with damp cloths to prevent heat
shrinkage and burning the thermal insulation tubing. Take care to ensure
that the flame does not come into contact with the main body itself.
• Do not use leak-detection additives.
Warning:
Do not mix anything other than the specified refrigerant (R410A) into the
refrigerating cycle when installing or moving. Mixing air may cause the refrig-
erating cycle to reach abnormally high temperature, resulting in burst pipes.
Caution:
Cut the tip of the outdoor unit piping, remove the gas, and then remove the
brazed cap.
[Fig. 4.2.1] (P.6)
A Cut here
Low pressure
Liquid side
(gas) side (gas) side
ø15.88*1 ø19.05*1
(Brazing) (Brazing)
(Brazing)
ø22.2
(Brazing)
ø19.05
(Brazing)
ø12.7*1
ø28.58*1
(Brazing)
(Brazing)
ø22.2*1
(Brazing) ø15.88*1
(Brazing)
ø15.88 or ø12.7
(Brazing) (Brazing)
*1 Use the supplied pipe.
B Remove brazed cap
ø9.52
11