1. Disconnect power.
2. Remove the refrigerant from the existing system per the
manufacturer's instructions provided with the recovery
system being used. Connect the R-22 gauge set is
connected to both sides of the refrigerant system (as shown),
and verify that the entire system is void of refrigerant in
accordance with the manufacturer's instructions provided
with the recovery system being used.
3. Disconnect the liquid and vapor lines from the existing
4. Remove the existing outdoor unit.
5. Set the new R-410A outdoor unit and connect the refrigerant
lines. See "Connect Refrigerant Lines" steps 1 through 5. Do
not evacuate the lines.
6. Remove the existing R-22 refrigerant flow control orifice or
thermal expansion valve on the indoor coil, and use a field
provided fitting to reconnect the lines.
Thermal Expansion Valve
A. Thermal expansion valve
A. Distributor fitting
B. Mounting flange
C. Piston orifice
D. Ring seal (supplied)
7. Remove the caps from the suction and liquid pressure taps.
E. Orifice extension stub
F. 0.812" brass hex nut
G. Brass hex fitting
8. Remove the valve cores.
9. Connect an R-22 cylinder with clean refrigerant to the suction
10. Connect the R-22 gauge set to the liquid line service valve
and connect a recovery machine with an empty recovery tank
to the gauge set.
11. Set the recovery machine for liquid recovery and start the
recovery machine in accordance with the manufacturer's
instructions provided with the recovery system being used.
12. Open the gauge set valves to allow the recovery machine to
run until a vacuum level less than 0" Hg (gauge pressure) is
established in the existing system line set and indoor coil.
13. Invert the cylinder of clean R-22 and open its valve to allow
liquid refrigerant to flow into the system through the vapor
14. After all of the liquid refrigerant has been recovered, switch
the recovery machine to vapor recovery to allow the recovery
machine to run until a vacuum level less than 0" Hg (gauge
pressure) is established in the existing system line set and
indoor coil in accordance with the manufacturer's instructions
provided with the recovery system being used.
NOTE: A single system flush should remove all of the mineral oil
from the existing refrigerant lines and indoor coil. A second
flushing may be done (using clean refrigerant) if insufficient
amounts of mineral oil were removed during the first flush. A
second flushing may be required to ensure that the maximum
amount of oil is removed.
15. Close the valves on the inverted R-22 cylinder and gauge set.
16. Remove the recovery machine, gauges, R-22 cylinder and the
field provided fitting installed in Step 6.
A. Suction pressure tap
B. Liquid pressure tap