25
Installing the MSEV
To install the MSEV, complete the
following steps:
1.
Pump down and recover any residual
refrigerant from the system.
2.
Remove the current TXV and its
bulb or EEV and its controller by
cutting. Take care to minimize the
risk of introducing contaminates into
the system when removing the
existing valve.
3.
Before continuing, clean the copper
connections of the MSEV. The
MSEV co
mes with a standard 3/8’’
outside diameter (OD) copper tubes
that are 3” in length on both sides of
the main body.
a.
Do not reduce the length of
the copper tubes when
brazing.
b.
Flare fittings should be used
if the copper tubes length is
reduced.
4.
Position the MSEV as displayed in
Figure 11
and ensure the arrow mark
aligns with the direction of fluid
flow. The blue arrows show which
way fluid is supposed to flow
through the valve. Also ensure that
the MSEV is installed in an upwards
orientation or at any angle less than
90° in either direction (represented
by the curved green arrows).
a.
The MSEV cannot be
installed in a downwards
orientation (shown in curved
red arrows). It will not
function as intended if
installed in such a way.
5.
Wrap the valve body with a wet
cloth before brazing.
6.
Connect the MSEV to the inlet of the
evaporator by brazing. Allow the
valve to air-cool after brazing.
a.
While brazing, direct heat
away from the valve body.
Ensure that the temperature
of the valve body does not
exceed 221°F (105°C).
7.
It is mandatory to install a brand new
filter drier at the inlet of the MSEV
as indicated in Figure 10. It can be
installed at about 6” away from the
MSEV. The MSEV must be
protected against contaminants to
ensure its optimal operation.
8.
The MSEV installation process is
now complete.
Figure 11 - MSEV installation orientation
DMQ highly recommends using a filter
drier with a 20 micron filtration rating.
WARNING
Summary of Contents for RQ SERIES
Page 1: ...RQ SERIES Variable Speed Scroll Compressor Supplement...
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Page 17: ...17 Figure 4 U S Drive Model Wiring Diagram Figure 5 U S Wiring Diagram...
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