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MSEV Series and USHX Hardware Installation Manual Rev 1.7
2.2
Installing the USHX
To install the USHX, complete the following steps:
1.
Pump down and recover any residual refrigerant from the system. This may have already been
done if a MSEV series valve was installed before this step.
2.
Obtain any ¼” access fitting that is compatible with the system. In this section, a ¼” access fitting
with a 3/16” OD extended tube is used as an example to demonstrate the installation process.
3.
See Figure 2-3 and Figure 2-4 below for the proper orientation of the USHX. When installing the
device on a horizontal copper line as shown in Figure 2-3, the USHX can only be installed up to a
45° angle from the vertical axis in either direction (represented by the curved green arrows).
When installing the device on a vertical copper line as shown in Figure 2-4, the USHX cannot be
installed at a downward angle (represented by the red arrow).
Figure 2-3: USHX installation
orientation on a horizontal copper line
Figure 2-4: USHX installation
orientation on a vertical copper line
4.
Drill a hole into the copper line that extended tubes may fit in to. The location of this hole should
be about 6” away from the outlet of the evaporator.
Care must be taken to not introduce copper shavings into the copper line while the
hole is being drilled.
5.
Remove the valve core of the access fitting before brazing.
6.
Braze the access fitting to the copper line and allow it to air-cool after brazing.
7.
Place the valve core back onto the access fitting and tighten the connection. This step completes
the installation of the ¼” access fitting. The final result should look similar to what is shown below
in Figure 2-5.
