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INDOOR
"_
COIL
L_
ANK RETURN
INLET
LIQUID
#2
RECOVERY@
CYLINDER
EXISTING VAPOR LINE
EXISTING LIQUID LINE
Flushing
Connections
INVERTED HCFC-22 CYLINDER
/
(Contains clean HCFC-22 to be used for flushing)
/
NOTE - The inverted HCFC-22 cylinder must contain
i
t
at least the same amount of refrigerant as was recov-
"x.]__J
ered from the existing system.
L
f ---- PREsLuO "'#E SURE
VAPOR LIN_E_,
I
SPA UNIT
(/_
('_
SERVICE VALVE
_
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G_UGEMAN_p_
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RECOVERY
MACHINE
Figure
13
CAUTION
Required
Equipment
You will need the following equipment in order to flush the
existing line set and indoor coil: two clean R-22 recovery
bottles, an oilless recovery machine with a pump down fea-
ture, and two sets of gauges (one for use with R-22 and
one for use with R-410A).
Flushing
Procedure
1, Remove existing R-22 refrigerant using the appropri-
ate procedure below.
ff 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
R-22 refrigerant
to flush the system -- Disconnect all power to the ex-
isting outdoor unit. Connect the existing unit, a clean
recovery cylinder and the recovery machine according
to the instructions provided with the recovery machine.
Remove all R-22 refrigerant from the existing system.
Refer to gauges after shutdown to confirm that the en-
tire system is completely void of refrigerant. Discon-
nect the liquid and vapor lines from the existing out-
door unit,
If the existing
outdoor
unit is equipped
with
manual shut-off valves AND you plan to use NEW
R-22 refrigerant to flush the system -- Start the ex-
isting R-22 system in the cooling mode and close the
liquid line valve. Pump all of the existing R-22 refriger-
ant back into the outdoor unit, (It may be necessary to
bypass the low pressure switches to ensure complete
,
refrigerant evacuation,)
When the low side system
pressures reach 0 psig, close the vapor line valve. Dis-
connect all power to the existing outdoor 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,
Remove the existing outdoor unit, Set the new R-410A
unit and follow the brazing
connection
procedure
which begins on the previous page to make line set
connections,
DO NOT install metering device 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.
A IMPORTANT
3. 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 R-410A refrigerant and may pre-
vent proper flushing, Use a field-provided fitting to re-
connect the lines.
4. Remove the pressure tap valve cores from the SPA
unit's service valves, Connect an R-22 cylinder with
clean refrigerant to the vapor service valve. Connect
the R-22 gauge set to the liquid line valve and connect
a recovery machine with an empty recovery tank to the
gauge set,
Page 9
SPA SERIES
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