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por line valve. Disconnect all power to the existing out-
door unit. Refer to gauges after shutdown to confirm
that the valves are not allowing refrigerant to flow back
into the low side of the system. Disconnect the liquid
and vapor lines from the existing outdoor unit.
2 − Remove the existing outdoor unit. Set the new R410A
unit and follow the brazing connection procedure
which begins on the previous page to make line set
connections.
DO NOT install provided R410A
check/expansion valve at this time.
Make low voltage and line voltage connections to the
new outdoor unit.
DO NOT turn on power to the unit
or open the outdoor unit service valves at this time.
3 − Remove the existing refrigerant flow control orifice or
thermal expansion valve before continuing with flush-
ing procedures. The existing devices are not ap-
proved for use with R410A refrigerant and may pre-
vent proper flushing. Use a field−provided fitting to re-
connect the lines.
IMPORTANT
The line set and indoor coil must be flushed with at
least the same amount of clean refrigerant that pre-
viously charged the system. Check the charge in
the flushing cylinder before proceeding.
Flushing Connections
LOW
PRESSURE
HIGH
PRESSURE
VAPOR LINE
SERVICE VALVE
Existing
Indoor Coil
HSXA15 UNIT
GAUGE MANIFOLD
RECOVERY MACHINE
Inverted HCFC−22 Cylinder
(Contains clean HCFC−22 to be
used for flushing)
LIQUID LINE
SERVICE VALVE
INLET
DISCHARGE
TANK RETURN
CLOSED
OPENED
EXISTING VAPOR LINE
EXISTING LIQUID LINE
RECOVERY
CYLINDER
NOTE − The inverted HCFC−22
cylinder must contain at least
the same amount of refrigerant
as was recovered from the ex-
isting system.
Figure 10