6
GB
en
4.3. Water pipe insulation for connection with hydro
unit
1. Cold (hot) water pipes require thermal insulation to prevent condensation on the
pipe surface while especially in the cooling mode as well as heat emission from
and penetration into the pipes.
2. Be sure to add insulation work to water piping by covering water pipework
separately with enough thickness heat-resistant polyethylene, so that no gap is
observed in the joint between indoor unit and insulating material, and insulating
materials themselves. When insulation work is insufficient, there is a possibility of
condensation, etc. Pay special attention to insulation work in the ceiling plenum.
(Fig. 4-6)
Fig. 4-6
• Insulation materials for the pipes to be added on site must meet the following
specifications:
Branch piping for indoor unit or
VALVE KIT
20 mm or more
• This specification is based on copper for water piping. When using plastic pipework,
choose a thickness based on the plastic pipe performance.
• Thermal insulation materials should have a thickness of 20 mm or larger.
• Install a heater on site when pipes are installed outside where a temperature is 0°C
or below and when the breaker may be turned off.
• 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.
3. Expansion vessel
Connect an expansion vessel to the expansion vessel connection port of the hydro
unit or to the return water pipe.
• Install an expansion vessel to accommodate expanded water.
• The maximum water temperature is 60°C.
• The minimum water temperature is 5°C.
• The circuit protection valve set pressure is 0.8-0.96 MPa.
• The circulation pump head pressure is 0.2 MPa. (CMH-WM250/350/500V-A)
4. Leakproof the water pipework, valves and drain pipework. Leakproof all the way to,
and include pipe ends so that condensation cannot enter the insulated pipework.
5. Apply caulking around the ends of the insulation to prevent condensation getting
between the pipework and insulation.
6. Add a drain valve so that the unit and pipework can be drained.
7. Ensure there are no gaps in the pipework insulation. Insulate the pipework right up
to the unit.
8. Ensure that the gradient of the drain pan pipework is such that discharge can only
blow out.
F
G
E
D
C
B
A
A
A Locally procured pipe insulation
B
Tighten this location with a band (procured locally)
C
Do not separate from the opening
D
Wrap overlap: 40 mm or more
E
Insulation material (procured locally)
F
Unit side insulation material
G
Depending on the selected joint, there may be a gap between the unit side pipe cover and
the joint.
If there is a gap, fill in the gap with the pipe covers prepared on-site.
4. Connecting water pipes
A
Indoor unit
B
Water pipe: Inlet
C
Water pipe: Outlet
D
Strainer (40 mesh or more)
(field supply)
E
Shut off valve
(field supply)
Fig. 4-5
C
B
E
A
D
E
Note:
*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
• Selection of water piping
Select the size according to the total capacity of indoor units to be installed
downstream.
• Please group units that operate on 1 branch.
11. Please refer to the [Fig. 4-5] when connecting the water supply.
12. Install a shut off valve and strainer in a place that is easy to operate and makes
maintenance work easy.
13. Apply insulation to the indoor unit pipework, strainer, shut off valve, and
pressure reducing valve.
14. Please do not use a corrosion inhibitor in the water system.
A
To outdoor unit
B
End connection (brazing)
C
HBC controller
D
Indoor unit (without valve)
A
To outdoor unit
B
End connection (brazing)
C
HBC controller
D
Indoor unit (without valve)
D
´ Indoor unit (with valve)
E
Twinning pipe (field supply)
Fig. 4-3
Fig. 4-4
A
B
D
D
D
D
D
F
D
*1
C
E
A
B
D
D
D
´
D
D
´
F
D
´
*1
C
G
H
G
G
E
F
Up to three units for 1 branch
hole; total capacity: below 80 (but
in same mode, cooling/heating)
G
Optional VALVE KIT
H
Pipe length between indoor unit
without valve and optional VALVE
KIT is less than 5 m.
E
Twinning pipe (field supply)
F
Up to three units for 1 branch
hole; total capacity: below 80 (but
in same mode, cooling/heating)
Water pipework is
screw connections
Water pipework is
screw connections
■ Connection of HBC (Indoor unit without valve)
* PLFY-WL·VFM Series has no valve.
■ Connection of HBC (Indoor unit with valve or connection VALVE KIT)
* PLFY-WL·VFM Series has no valve.
Unit model
Connection size
Pipe size
Water
volume
(ℓ)
Water
inlet
Water
outlet
Water
out
Water
return
PLFY-WL10VFM
O.D.
22 mm
O.D.
22 mm
Inner
diameter
≥ 20 mm
Inner
diameter
≥ 20 mm
0.5
PLFY-WL15VFM
0.5
PLFY-WL20VFM
0.9
PLFY-WL25VFM
0.9
PLFY-WL32VFM
0.9
PLFY-WL40VFM
0.9
10. HBC and VALVE KIT water pipe connection sizes
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