– 15 –
Air to Water Heat Pump
Installation Manual
Optional installation parts
(Locally procured)
Refrigerant piping connection
CAUTION
TAKE NOTE OF THESE 4 IMPORTANT POINTS
BELOW FOR PIPING WORK
1. Keep dust and moisture away from inside the
connecting pipes.
2. Tightly connect the connection between pipes
and the unit.
3. Evacuate the air in the connecting pipes using a
VACUUM PUMP.
4. Check for gas leaks at connection points.
Piping connection
Flaring
1. Cut the pipe with a pipe cutter.
Be sure to remove burrs that may cause a gas leak.
2. Insert a flare nut into the pipe, and then flare the
pipe. Use the flare nuts supplied with the air to water
heat pump or those for R410A.
Insert a flare nut into the pipe, and flare the pipe.
As the flaring sizes of R410A differ from those of
refrigerant R22, the flare tools newly manufactured
for R410A are recommended.
However, the conventional tools can be used by
adjusting the projection margin of the copper pipe.
Projection margin in flaring: B (Unit: mm)
Rigid (Clutch type)
Flaring diameter size: A (Unit: mm)
* In case of flaring for R410A with the conventional
flare tool, pull the tool out approx. 0.5 mm more than
that for R22 to adjust it to the specified flare size.
The copper pipe gauge is useful for adjusting the
projection margin size.
Piping necessary to change the flare nut /
machining size due to pipe compression
▼
Flare nut width: H and flare matching size: A.
Flare nut width: H
Flare machining size: A
Do not apply refrigerator oil to the flare surface.
Parts name
Qty
A
Refrigerant piping
Liquid side: Ø9.5 mm
Gas side: Ø15.9 mm
One each
B
Pipe insulating material
(polyethylene foam, 10 mm thick)
1
C
Putty, PVC tape
One each
Liquid side
Outer diameter
Thickness
Ø9.5 mm
0.8 mm
Gas side
Outer diameter
Thickness
Ø15.9 mm
1.0 mm
Outer diam. of
copper pipe
R410A tool used Conventional tool
used
R410A
1.0 to 1.5
9.5
0 to 0.5
15.9
Outer diam. of copper pipe
A
9.5
13.2
15.9
19.7
(mm)
Copper pipe
outer dia.
Ø6.4
Ø9.5
Ø12.7
Ø15.9
Ø19.0
For R410A
17
22
26
29
36
For R22
Same as above
24
27
Same
as
above
(mm)
Copper pipe
outer dia.
Ø6.4
Ø9.5
Ø12.7
Ø15.9
Ø19.0
For R410A
9.1
13.2
16.6
19.7
24.0
For R22
9.0
13.0
16.2
19.4
23.3
Becomes a little larger for R410A
B
A
+0
–0.4
H
A
15-EN
Summary of Contents for HWS-1105H-E
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