AAON RQ SERIES, Manual, Page: 28 / 36

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11. Wrap the thermistor with the
insulation material and secure the
insulation in place using a zip tie.
The final result should be similar to
what is shown below in Figure 17.
Figure 17 - Insulation secured to the thermistor
12. Check for leaks at all the braze joints
after brazing.
13. Pull a vacuum on the system until
250 microns is reached.
14. Restore refrigerant to the system.
15. Perform another check for leaks at
all braze joints.
16. Refer to Electrical Wiring section to
complete the electrical wiring of the
system.
17. Refer to USHX Software User
Interface Manual to set up
communications between the USHX
and the computer.
18. Supply power to the USHX with a
power supply and power it on.
19. Ensure that the settings in the GUI
meet the system requirements (i.e.
double check the Refrigerant, Target
Superheat, Device Mode, and other
settings).
20. Power on the HVAC/R system and
the MSEV and USHX will
automatically begin functioning.
21. Observe the superheat temperature
values in the GUI Status tab to
ensure that the system is performing
nominally. Adjust the system
settings through the GUI if
necessary.
Electrical Wiring
After the mechanical installation of the
MSEV(s) and/or USHX(s) into the system,
complete the electrical wiring of the system
by completing the following steps.
Single USHC-MSEV or Single USHS
1. Check the voltage type – either 12 V
or 24 V – of the MSEV. It can be
found on the MSEV model number
label. The power source required will
be based on the MSEV voltage type.
Do not turn the power source ON until all
electrical wiring setup is complete.
WARNING
Ensure that the power source voltage
matches the MSEV voltage type. If a 12 V
MSEV is powered by a 24 V power source,
the MSEV will fail due to an over-voltage.
If a 24 V MSEV is powered by a 12 V
power source, the MSEV will not fully
open due to an under-voltage.
WARNING