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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.
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 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 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.
- Infiltration of a large amount of mineral oil may cause the refrigerant oil to dete-
riorate.
•
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.
1. Size of HBC controller's end connection piping
[Fig. 4.1.2] (P.3)
Unit model
Model name
PURY-WP200
(HBC CONTROLLER)
CMB-WP108V-G
PURY-WP250
A To outdoor unit
B End connection (brazing)
C HBC controller
D Indoor unit
E Twinning pipe (field supply)
F Up to three units for 1 branch hole; total capacity: below 80 (but in same mode, cool-
ing/heating)
Note:
Be sure to use non-oxidative brazing.
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.
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 refrig-
erating cycle when installing or moving. Mixing air may cause the refrigerating
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.3)
A Cut here
8
HBC CONTROLLER
High pressure
Low pressure
side
side
ø15.88
ø19.05
(Brazing)
(Brazing)
ø19.05
ø22.2
(Brazing)
(Brazing)
B Remove brazed cap
4.3. Insulating refrigerant pipes
Be sure to add insulation work to refrigerant piping by covering high-pressure pipe
and low-pressure pipe separately with enough thickness heat-resistant polyethylene
foam, so that no gap is observed in the joint between the HBC controller and insulat-
ing material, and insulating materials themselves. When insulation work is insuffi-
cient, there is a possibility of condensation. Pay special attention to insulation work in
the ceiling plenum.
[Fig. 4.3.1] (P.3)
A Locally procured insulating material for pipes
B Bind here using band or tape.
D Lap margin: more than 40 mm
F Unit side insulating material
•
Insulation materials for the pipes to be added on site must meet the following
specifications:
Outdoor unit
High-pressure pipe
-HBC controller Low-pressure pipe
Temperature Resistance
100°C min.
•
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 brazed connections must be covered with insulation, with its seam facing
upward and fastened with the bands.
4.4. Drain piping work
1. Drain piping work
•
Ensure that the drain piping is downward (sloped gradient of more than 1/100) to
the outdoor (discharge) side. If it is impossible to take any downward pitch, use
an optionally available drain-up mechanism to obtain a downward pitch of more
than 1/100.
•
Ensure that any cross-wise drain piping is less than 20 m. If the drain piping is
long, support it with metal brackets to prevent it from bending, warping, or vibrat-
ing.
•
Connect the supplied drain hose to the discharge port on the unit body. Use hard
vinyl chloride pipes VP-25 (ø32) for drain piping (2). Tighten the supplied drain
hose onto the discharge port using the supplied hose band. (For this, do not use
any adhesive because the drain hose will need to be removed for servicing at a
later date.)
•
Do not use any odor trap around the discharge port.
[Fig. 4.4.1] (P.3)
A: 25 cm
A Downward gradient of more than 1/100
B Insulating material
D Drain discharge port
F Cable tie (accessory)
As shown in 3, install a collecting pipe about 10 cm below the drain ports and give
•
it a downward pitch of more than 1/100. This collecting pipe should be of VP-30.
•
Set the end of drain piping in a place without any risk of odor generation.
•
Do not put the end of drain piping into any drain where ionic gases are generated.
•
Drain piping may be installed in any direction. However, please be sure to
observe the above instructions.
[Fig. 4.4.2] (P.3)
A HBC controller
C Collecting pipe
2. Discharge test
After completing drain piping work, open the HBC controller panel, and test drain dis-
charge using a small amount of water. Also, check to see that there is no water leak-
age from the connections.
3. Insulating drain pipes
Provide sufficient insulation to the drain pipes just as for refrigerant pipes.
Caution:
Be sure to provide drain piping with heat insulation in order to prevent excess
condensation. Without drain piping, water may leak from the unit causing
damage to your property.
C Do not leave any opening.
E Insulating material (field supply)
10 mm or more
20 mm or more
B: 1.5 – 2 m
C Supporting bracket
E Drain hose (200 mm long, accessory)
G Hose band (accessory)
B Indoor unit
D Please ensure this length is at least 10 cm.
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