Page 9
HPXA16 SERIES
IMPORTANT
The Environmental Protection Agency prohibits the
intentional venting of HFC refrigerants during main-
tenance, service, repair and disposal of appliance.
Approved methods of recovery, recycling or re-
claiming must be followed.
CAUTION
This procedure should not be performed on sys-
tems which contain contaminants (Example: com-
pressor burn out).
Required Equipment
You will need the following equipment in order to flush the
existing line set and indoor coil: two clean HCFC−22 recov-
ery bottles, an oilless recovery machine with a pump down
feature, and two sets of gauges (one for use with HCFC−22
and one for use with the HFC−410A).
Flushing Procedure
1. Remove existing HCFC−22 refrigerant using the ap-
propriate procedure below.
If the existing outdoor unit is not equipped with
shut−off valves, or if the unit is not operational
AND you plan to use the existing HCFC−22 refrig-
erant to flush the system −
Disconnect all power to the existing outdoor unit.
Connect to the existing unit, a
clean
recovery cyl-
inder and the recovery machine according to the
instructions provided with the recovery machine.
Remove all HCFC−22 refrigerant from the existing
system. Check gauges after shutdown to confirm
that the entire system is completely void of refrig-
erant.
Disconnect the liquid and vapor lines from the ex-
isting outdoor unit.
If the existing outdoor unit is equipped with
manual shut−off valves AND you plan to use NEW
HCFC−22 refrigerant to flush the system
−
Start the existing HCFC−22 system in the cooling
mode and close the liquid line valve.
Pump all of the existing HCFC−22 refrigerant back
into the outdoor unit. (It may be necessary to by-
pass the low pressure switches to ensure com-
plete refrigerant evacuation.)
When the low side system pressures reach 0 psig,
close the vapor line valve.
Disconnect all power to the existing outdoor unit.
Check 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 ex-
isting outdoor unit.
2. Remove the existing outdoor unit. Set the new
HFC−410A unit and follow the brazing connection pro-
cedure (see page 8) to make line set connections.
DO NOT install metering device at this time.
3. 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.
IMPORTANT
The line set and indoor coil must be flushed with
at least the same amount of clean refrigerant that
previously charged the system. Check the charge
in the flushing cylinder before proceeding.
4. Remove the existing refrigerant flow control orifice or
thermal expansion/check valve before continuing with
flushing procedures. The existing devices are not ap-
proved for use with HFC−410A refrigerant and may
prevent proper flushing. Use a field−provided fitting to
reconnect the lines.
Flushing Connections
Low
Pressure
High
Pressure
VAPOR LINE
SERVICE VALVE
EXISTING
INDOOR COIL
HPXA16
UNIT
GAUGE MANIFOLD
RECOVERY MACHINE
Inverted HCFC−22 Cylin-
der
(Contains clean
HCFC−22 to be used for
flushing)
LIQUID LINE
SERVICE VALVE
Inlet
Discharge
Tank Return
Closed
Opened
EXISTING LIQUID LINE
RECOVERY CYLINDER
NOTE − The inverted HCFC−22 cyl-
inder must contain at least the
same amount of refrigerant as was
recovered from the existing sys-
tem.
Figure 14
EXISTING VAPOR LINE
