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XPG20 SERIES
Flushing the System
TEFLON RING
FIXED
ORIFICE
(Uncased Coil Shown)
BRASS NUT
LIQUID LINE ASSEMBLY
(INCLUDES STRAINER)
LIQUID LINE ORIFICE HOUSING
DISTRIBUTOR TUBES
DISTRIBUTOR
ASSEMBLY
REMOVE AND
DISCARD
WHITE TEFLON
SEAL (IF PRESENT)
1. On fully cased coils, remove the coil access and plumbing panels.
2. Remove any shipping clamps holding the liquid line and distributor
assembly.
3. Using two wrenches, disconnect liquid line from liquid line orifice
housing. Take care not to twist or damage distributor tubes during
this process.
4. Remove and discard fixed orifice, valve stem assembly if present
and Teflon washer as illustrated above.
5. Use a field−provided fitting to temporary reconnect the liquid line to
the indoor unit’s liquid line orifice housing.
TYPICAL FIXED ORIFICE REMOVAL PROCEDURE
TYPICAL TXV REMOVAL PROCEDURE
TWO PIECE
PATCH PLATE
(UNCASED COIL
ONLY)
SUCTION
LINE
DISTRIBUTOR
ASSEMBLY
DISTRIBUTOR
TUBES
LIQUID
LINE
MALE EQUALIZER
LINE FITTING
SENSING
LINE
EQUALIZER
LINE
TXV
TEFLON
RING
(Uncased Coil Shown)
STUB END
TEFLON
RING
SENSING BULB
LIQUID LINE
ORIFICE HOUSING
LIQUID LINE ASSEMBLY
WITH BRASS NUT
1. On fully cased coils, remove the coil access and plumbing panels.
2. Remove any shipping clamps holding the liquid line and distributor assem-
bly.
3. Disconnect the equalizer line from the TXV equalizer line fitting on the suc-
tion line.
4. Remove the suction line sensing bulb.
5. Disconnect the liquid line from the TXV at the liquid line assembly.
6. Disconnect the TXV from the liquid line orifice housing. Take care not to
twist or damage distributor tubes during this process.
7. Remove and discard TXV and the two Teflon rings.
8. Use a field−provided fitting to temporary reconnect the liquid line to the in-
door unit’s liquid line orifice housing.
LOW
HIGH
EXISTING
INDOOR
UNIT
GAUGE
MANIFOLD
INVERTED HCFC−22
CYLINDER CONTAINS
CLEAN HCFC−22 TO BE
USED FOR FLUSHING.
LIQUID LINE SERVICE
VALVE
INLET
DISCHARGE
TANK
RETURN
CLOSED
OPENED
RECOVERY
CYLINDER
RECOVERY MACHINE
NEW
OUTDOOR
UNIT
SUCTION LINE
SERVICE
VALVE
SUCTION
LIQUID
1
1. Inverted HCFC−22 cylinder with clean refrigerant to the suction
service valve.
2. HCFC−22 gauge set (low side) to the liquid line valve.
3. HCFC−22 gauge set center port to inlet on the recovery machine.
with an empty recovery tank to the gauge set.
4. Connect recovery tank to recovery machines per machine
instructions.
CONNECT GAUGE SET AND EQUIPMENT FOR
FLUSHING PROCEDURE
B
1
2
3
4
Remove the existing HCFC−22 refrigerant flow control orifice or thermal expansion valve from the indoor coil before flushing the line set. The existing indoor
unit HCFC−22 metering device cannot be use with HFC−410A refrigerant and may prevent proper flushing.
A
B
OR
C
FLUSHING LINE SET
1. Set the recovery machine for liquid recovery and start the recovery ma-
chine. Open the gauge set valves to allow the recovery machine to pull
a vacuum on the existing system line set and indoor unit coil.
2. Invert the cylinder of clean HCFC−22 and open its valve to allow liquid re-
frigerant to flow into the system through the suction line valve. Allow the
refrigerant to pass from the cylinder and through the line set and the in-
door unit coil before it enters the recovery machine.
3. After all of the liquid refrigerant has been recovered, switch the recovery
machine to suction recovery so that all of the HCFC−22 suction is recov-
ered. Allow the recovery machine to pull a vacuum on the system.
4. Close the valve on the inverted HCFC−22 drum and the gauge set valves.
Pump the remaining refrigerant out of the recovery machine and turn the
machine off.
NOTE
The line set and indoor unit 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.
