26
4. Attach the union nut.
Remove the union nut on the indoor connection pipe and the outdoor valve.
Install the union nut on the pipe.
5. Expand the port.
Use an expander to increase the diameter of the port.
Outer Diameter
(inches / mm)
A (inches / mm)
Max
Min
Φ
1
/
4
”
/
Φ6.mm - Φ6.35mm
3
/
64
”
/ 1.3mm
1
/
64
”
/ 0.7mm
Φ
3
/
8
”
/
Φ9.52mm
1
/
16
”
/ 1.6mm
1
/
32
”
/ 1.0mm
Φ
1
/
2
”
/
Φ12mm - Φ12.7mm
5
/
64
”
/ 1.8mm
1
/
32
”
/ 1.0mm
Φ
5
/
8
”
/
Φ15.8mm - Φ16mm
3
/
32
”
/ 2.4mm
5
/
64
”
/ 2.2mm
6. Inspection.
Inspect the pipe to verify that it was expanded properly. See the below image for common
issues that may occur. An improperly expanded pipe will not seal properly and could lead
to system malfunction.
Note
: The “A” measurement varies according to the diameter. Refer to the table below.