Mitsubishi Electric CITY MULTI CMB-WP108NU-AA Manual De Instalación página 6

4. Connecting refrigerant pipes and drain pipes
4.1. Connecting refrigerant pipes
1. Be sure to use non-oxidative brazing where necessary. If you do not use non-oxi-
dative brazing, it may clog the pipes.
When brazing 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 [19-11/16 in] inter-
vals or less, and at 2-meter [78-3/4 in] intervals or less in other areas.
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 HBC controller's end connection piping
[Fig. 4.1.2]
Use of one HBC controller
Unit model
PURY-(E)P72T/
YNU
(HBC controller)
Outdoor PURY-(E)P96T/
CMB-WP108NU-AA
unit side YNU
CMB-WP-1016NU-AA *2
PURY-(E)P120T/
YNU
Use of two HBC controllers
Unit model
PURY-(E)P72T/
YNU
PURY-(E)P96T/
YNU
(HBC controller)
Outdoor PURY-(E)P120T/
CMB-WP108NU-AA
unit side YNU
CMB-WP-1016NU-AA *2
PURY-(E)P144T/
YNU
PURY-(E)P168T/
YNU
A
C
B
F
E E E E
*1
A To outdoor unit
C Main-HBC controller
E Indoor unit
G Up to three units for 1 branch hole; total capacity: below 30 (but in same mode, cool-
ing/heating)
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.
6
HBC controller
Model name High pressure side
ø15.88 [5/8] (Brazing)
ø19.05 [3/4] (Brazing)
ø19.05 [3/4] (Brazing)
Between outdoor unit and twinning pipe
Model name
High pressure side
ø15.88 [5/8] (Brazing)
ø19.05 [3/4] (Brazing)
ø19.05 [3/4] (Brazing)
ø22.2 [7/8] (Brazing)
ø22.2 [7/8] (Brazing)
D
E E E E
G
B End connection (brazing)
D Sub-HBC controller
F Branch joint (field supply)
Caution:
• Use refrigerant piping made of phosphorus deoxidized 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, swarf, oils, moisture, or any other contaminants.
- R410A is 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.
- Infiltration of a large amount of mineral oil may cause the refrigerant oil to
deteriorate.
• Do not vent R410A into the atmosphere.
(Unit: mm [in])
Low pressure side
ø19.05 [3/4] (Brazing)
ø22.2 [7/8] (Brazing)
ø28.58 [1-1/8] (Brazing)
HBC controller
Between twinning pipe and HBC controller
Low pressure side High pressure side
ø15.88 [5/8] (Brazing)
ø19.05 [3/4] (Brazing)
for each HBC controller
ø15.88 [5/8] (Brazing)
ø22.2 [7/8] (Brazing)
for each HBC controller
ø15.88 [5/8] (Brazing)
ø28.58 [1-1/8] (Brazing)
for each HBC controller
ø15.88 [5/8] (Brazing)
ø28.58 [1-1/8] (Brazing)
for each HBC controller
ø19.05 [3/4] (Brazing)
ø28.58 [1-1/8] (Brazing)
for each HBC controller
Note:
• Be sure to use non-oxidative brazing.
*1. To connect multiple indoor units to a port
• Maximum total capacity of connected indoor units: WL30
• Maximum number of connectable indoor units: 3 units
• Branch joints are field-supplied.
*2. PURY-(E)P-120T/YNU model or larger requires a connection of two main-
HBC controllers in parallel.
• For the connection with outdoor units other than those listed in the table,
refer to the Databook of the HBC controller.
[Fig. 4.2.1]
HBC controller 1
A
HBC controller 2
B
A
A Main-HBC controller
B Twinning pipe (field supply)
Low pressure side
ø19.05 [3/4] (Brazing)
for each HBC controller
ø19.05 [3/4] (Brazing)
for each HBC controller
ø19.05 [3/4] (Brazing)
for each HBC controller
ø19.05 [3/4] (Brazing)
for each HBC controller
ø22.2 [7/8] (Brazing)
for each HBC controller