R e s i d e n t i a l Tr a n q u i l i t y
®
2 7 S p l i t ( T T S ) - 6 0 H z H F C - 4 1 0 A
R e v. : 8 M a y, 2 0 1 4 C
18
G e o t h e r m a l H e a t i n g a n d C o o l i n g
Refrigeration Installation
6. If the indoor coil is left in place during
fl
ushing, removing
the existing refrigerant
fl
ow control ori
fi
ce or thermal
expansion valve prior to
fl
ushing is highly recommended
to assure proper
fl
ushing. Use a
fi
eld-provided
fi
tting or
piece of copper tubing to reconnect the lines where the
thermal expansion valve was removed.
7. Remove the pressure tap valve cores from the compressor
section’s service valves.
8. Connect an R-22 cylinder of clean R-22 refrigerant to the
vapor service valve. (see “Required Equipment Section”
for minimum required amount of R-22 for adequate
fl
ushing)
9. Connect the low pressure side of an R-22 gauge set to the
liquid line valve.
10. Connect a hose from the recovery machine with an empty
recovery drum to the common port of the gauge set.
11. Set the recovery machine for liquid recovery and start the
machine.
12. Open the gauge set low side valve. This will allow the
recovery machine to pull a vacuum on the existing system
line set.
13. Make sure to invert the cylinder of clean R-22 refrigerant
and open the cylinder’s valve to allow liquid refrigerant to
fl
ow into the system through the vapor line valve. (This
should allow the refrigerant to
fl
ow from the cylinder and
through the line set before it enters the recovery machine.)
The cylinder should not be inverted if it is the type with
separate liquid and vapor valves. Use the liquid valve on
the cylinder in this case, keeping the cylinder upright.
14. Once the liquid refrigerant has been completely recovered,
switch the recovery machine to vapor recovery so that the
R-22 vapor can be completely recovered.
IMPORTANT! Always remember, every time the
system is fl ushed you must always pull a vacuum
with a recovery machine on the system at the
end of each procedure.
(If desired, a second
fl
ushing
with clean refrigerant may be performed if insu
ffi
cient
amounts of mineral oil were removed during the initial
fl
ush.)
15. Tightly close the valve on the inverted R-22 cylinder and
the gauge set valves.
16. Completely pump all remaining R22 refrigerant out of the
recovery machine and turn the machine o
ff
.
17. Before removing the recovery machine, R-22 refrigerant
cylinder and gauges, break the vacuum on the refrigerant
lines and indoor coil using dry-nitrogen.
18. Unsweat the liquid and vapor lines from the old indoor coil
or from each other and install a new matched HFC-410A
indoor coil, connecting the
fl
ushed refrigerant lines to the
new coil using
fi
eld supplied connectors and tubing.
19. Reinstall pressure tap valve cores into unit service valves.
20. Pressurize the lines and coil and check for leaks in the line
set connection points using a soap solution.
21. Thoroughly evacuate the line set and indoor coil per the
instructions found in this manual.
22. Open the liquid and vapor service valves, releasing the
HFC-410A refrigerant contained in the compressor section
into the evacuated line set and indoor coil.
23. Energize the system and adjust the refrigerant charge
according to the charging procedures found in this
manual.
