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Flushing Line Set and Indoor Coil
1A
TYPICAL EXISTING FIXED ORIFICE
REMOVAL PROCEDURE (UNCASED
COIL SHOWN)
DISTRIBUTOR TUBES
LIQUID LINE ORIFICE HOUSING
DISTRIBUTOR
ASSEMBLY
REMOVE AND DISCARD
WHITE TEFLON
(IF PRESENT)
A
On fully cased coils, remove the coil access and plumbing panels.
B
Remove
sembly.
C
Using two wrenches, disconnect liquid line from liquid
ing. T
cess.
D
Remove and discard fixed orifice, valve stem assembly if present and
®
Teflon
washer as illustrated above.
E
Use a field-provided fitting to temporarily reconnect the liquid line to the
indoor unit's liquid line orifice housing.
2
CONNECT GAUGES AND EQUIPMENT FOR
FLUSHING PROCEDURE
INVERTED CYLINDER
CONTAINS CLEAN
HCFC22* TO BE USED
A
FOR FLUSHING.
1
VAPOR LINE
SERVICE VALVE
EXISTING
INDOOR
B
UNIT
LIQUID LINE SERVICE
VALVE
D
RECOVERY CYLINDER
A
Inverted HCFC-22 cylinder with clean refrigerant* to the vapor service
valve.
B
HCFC-22 gauge set (low side) to the liquid line valve.
C
HCFC-22 gauge set center port to inlet on the recovery machine with an
empty recovery tank to the gauge set.
D
Connect recovery tank to recovery machines per machine instructions.
*IMPORTANT - Clean refrigerant is any refrigerant in a system that has not had compressor burn out. If the system
has experienced burn out, it is recommended that the existing line set and indoor coil be replaced.
OR
®
TEFLON
RING
FIXED ORIFICE
BRASS NUT
®
SEAL
LIQUID LINE ASSEMBLY
(INCLUDES STRAINER)
GAUGE
MANIFOLD
LOW
NEW
OUTDOOR
UNIT
OPENED
CLOSED
TANK
RETURN
C
INLET
DISCHARGE
RECOVERY MACHINE
FIGURE 8. Removing Metering Device and Flushing
1B
TYPICAL EXISTING EXPANSION VALVE REMOVAL
PROCEDURE (UNCASED COIL SHOWN)
TWO PIECE PATCH PLATE
LIQUID LINE
(UNCASED COIL ONLY)
ORIFICE
HOUSING
DISTRIBUTOR
TUBES
DISTRIBUTOR
ASSEMBLY
MALE EQUALIZER
LINE FITTING
SENSING BULB
A
On fully cased coils, remove the coil access and plumbing panels.
B
Remove any shipping clamps holding the liquid line and distributor
assembly.
C
Disconnect the equalizer line from the check expansion valve
equalizer line fitting on the vapor line.
D
Remove the vapor line sensing bulb.
E
Disconnect the liquid line from the check expansion valve at the liquid
line assembly.
F
Disconnect the check expansion valve from the liquid line orifice
housing. Take care not to twist or damage distributor tubes during this
process.
G
Remove and discard check expansion valve and the two Teflon
HIGH
H
Use a field-provided fitting to temporary reconnect the liquid line to the
indoor unit's liquid line orifice housing.
3
FLUSHING LINE SET
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.
A
Set the recovery machine for liquid recovery and start the
recovery machine. Open the gauge set valves to allow the
recovery machine to pull a vacuum on the existing system line
B
set and indoor unit coil.
B
Invert the cylinder of clean HCFC-22* and open its valve to allow
liquid refrigerant to flow into the system through the vapor line
valve. Allow the refrigerant to pass from the cylinder and through
the line set and the indoor unit coil before it enters the recovery
machine.
C
After all of the liquid refrigerant has been recovered, switch the
recovery machine to vapor recovery so that all of the HCFC-22
vapor is recovered. Allow the recovery machine to pull the
system down to 0.
D
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.
Page 15
STUB END
CHECK
EXPANSION
VALVE
TEFLON
RING
®
TEFLON
RING
EQUALIZER
LINE
LIQUID LINE
ASSEMBLY WITH
BRASS NUT
VAPOR
LINE
®
SENSING
LINE
LIQUID
LINE
®
rings.
31-5000747 Rev. 0
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