Connecting Refrigerant Pipes And Drain Pipes; Connecting Refrigerant Pipes; Refrigerant Piping Work; Insulating Pipes - Mitsubishi Electric CITY MULTI CMB-WM108V-AA Installation Manual

4. Connecting refrigerant pipes and drain pipes

4.1. Connecting refrigerant pipes

1. Be sure to use non-oxidative bra ing where necessary. If you do not use non-oxi-
dative bra ing, it may clog the pipes.
When bra ing the outdoor unit connecting port of HBC controller, supply nitrogen
gas into the pipe between the outdoor unit and HBC controller.
2. After completing pipe connection, support the pipes to ensure that load is not
imparted to the HBC controller s end connections.
3. When using mechanical couplings, use the ones that meet ISO14903.
4. Support the on-site pipes near the HBC controller at 0.5-meter intervals or less,
and at 2-meter intervals or less in other areas.
Warning:
When installing and moving the unit, do not charge it with refrigerant other
than the refrigerant (R410A or R32) 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 deoxidi ed 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 ha ardous sulphur,
oxides, dust/dirt, swarf, oils, moisture, or any other contaminants.
- R410A and R32 are high-pressure refrigerants 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 bra ing. (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.
- Infiltration of a large amount of mineral oil may cause the refrigerant oil to
deteriorate.
Do not vent R410A and R32 into the atmosphere.
1. Si e of HBC controller s end connection piping
Fig. 4.1.2 (P.3)
Unit model
PURY-(E)P200
PURY-(E)P250
PURY-(E)P300
PURY-(E)P350
PURY-(E)P400
PURY-(E)P450
PURY-(E)P500
(HBC CONTROLLER)
CMB-WM108V-AA
CMB-WM1016V-AA
PURY-(E)M200
*2
PURY-(E)M250
PURY-(E)M300
PURY-(E)M350
PURY-(E)M400
PURY-(E)M450
PURY-(E)M500
A To outdoor unit
C Main-HBC controller
E Indoor unit
G Up to three units for 1 branch hole; total capacity: below 80 (but in same mode, cool-
ing/heating)
10
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HBC CONTROLLER
High pressure
Model name
side
15.88
(Bra ing)
19.05
(Bra ing)
19.05
(Bra ing)
19.05
(Bra ing)
15.88
(Bra ing) for
each HBC
15.88
(Bra ing) for
each HBC
19.05
(Bra ing) for
each HBC
15.88
(Bra ing)
15.88
(Bra ing)
15.88
(Bra ing)
15.88
(Bra ing)
15.88
(Bra ing) for
each HBC
15.88
(Bra ing) for
each HBC
15.88
(Bra ing) for
each HBC
B End connection (bra ing)
D Sub-HBC controller
F Twinning pipe (field supply)
Note:
Be sure to use non-oxidative bra ing.
*1. Connection of multiple indoor units with one connection (or joint pipe)
Total capacity of connectable indoor units: Less than 80
Number of connectable indoor units: Maximum 3 Sets
Twinning pipe is field supplied.
*2. PURY-(E)P-400YNW/PURY-(E)M400YNW model or larger requires a
connection of two main-HBC controllers in parallel.

4.2. Refrigerant piping work

After connecting the refrigerant pipes of the outdoor units with the outdoor 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 HBC controller) completely.
How to handle stop valves is described on each outdoor unit.
Precautions for HBC controller combinations
Refer to Fig. 4.2.1 for the positioning of twinning pipes.
Fig. 4.2.1 (P.3)
HBC controller 1
Slope of twinning pipes (high-pressure side and low-pressure side)
Make sure the slope of the twinning pipes are at an angle within
If the slope exceeds the specified angle, it may cause lack of capacity.
A Main-HBC controller
B Twinning pipe (field supply)
C Slope of the twinning pipe is at an angle within
Notes:
Have a fire extinguisher nearby before bra ing work.
Provide no-smoking signs at the bra ing workplace.
After pipe connection, be sure to check that there is no gas leakage, using
a leak detector or soap-and-water solution.
Before bra ing the refrigerant piping, always wrap the piping on the main
body, and the thermal insulation piping, with damp cloths to prevent heat
Low pressure
shrinkage and burning the thermal insulation tubing. Take care to ensure
side
that the flame does not come into contact with the main body itself.
Do not use leak-detection additives.
19.05
Straight run of pipe connecting twinning pipe is 500 mm or more.
(Bra ing)
Piping work shall be kept to a minimum.
22.2
The pipes shall be protected from physical damage.
(Bra ing)
22.2
Warning:
(Bra ing)
28.58 Do not mix anything other than the specified refrigerant (R410A or R32) into
(Bra ing) the refrigerating cycle when installing or moving. Mixing air may cause the
refrigerating cycle to reach abnormally high temperature, resulting in burst
19.05
pipes.
(Bra ing) for
each HBC
Caution:
22.2
Cut the tip of the outdoor unit piping, remove the gas, and then remove the
(Bra ing) for
bra ed cap.
each HBC
Fig. 4.2.2 (P.3)
22.2
(Bra ing) for A Cut here
each HBC

4.3. Insulating pipes

19.05
(Bra ing) Be sure to add insulation work to piping by covering high-temperature pipe and low-
temperature pipe separately with enough thickness heat-resistant polyethylene
22.2
foam, so that no gap is observed in the joint between the HBC controller and
(Bra ing)
insulating material, and insulating materials themselves. When insulation work is
22.2
insufficient, there is a possibility of condensation. Pay special attention to insulation
(Bra ing)
work in the ceiling plenum.
28.58
Fig. 4.3.1 (P.4)
(Bra ing)
A Locally procured insulating material for pipes
19.05
B Bind here using band or tape.
(Bra ing) for
D Lap margin: more than 40 mm
each HBC
F Unit side insulating material
22.2
Insulation materials for the pipes to be added on site must meet the following
(Bra ing) for
specifications:
each HBC
22.2 Outdoor unit
(Bra ing) for
-HBC controller Low-pressure pipe
each HBC
Temperature Resistance
Installation of pipes in a high-temperature high-humidity environment, such as
the top floor of a building, may require the use of insulation materials thicker than
the ones specified in the chart above.
When certain specifications presented by the client must be met, ensure that
they also meet the specifications on the chart above.
The bra ed connections must be covered with insulation, with its seam facing
upward and fastened with the bands.
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Pipe si e
HBC controller 2 15.88 (Bra ing)
15 to the ground.
15 to the ground
B Remove bra ed cap
C Do not leave any opening.
E Insulating material (field supply)
High-pressure pipe 10 mm or more
20 mm or more
100 C min.