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XC14 SERIES
LOW
PRESSURE
HIGH
PRESSURE
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
NOTE − The inverted HCFC−22 cylinder must contain at least the same
amount of refrigerant as was recovered from the existing system.
RECOVERY MACHINE
NEW
OUTDOOR
UNIT
SUCTION LINE
SERVICE VALVE
SUCTION
LIQUID
Figure 22. Typical Flushing Connection
CAUTION
This procedure should not be performed on
systems which contain contaminants (Example:
compressor burn out).
REQUIRED EQUIPMENT
Equipment required to flush the existing line set and indoor
unit coil:
Two clean HCFC−22 recovery bottles,
Oilless recovery machine with pump-down feature,
Two gauge sets (one for HCFC−22; one for
HFC−410A).
PROCEDURE
1. Connect the following:
HCFC−22 cylinder with clean refrigerant to the
suction service valve,
HCFC−22 gauge set to the liquid line valve,
Recovery machine with an empty recovery tank to
the gauge set.
2. 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 set and indoor unit coil.
3. Invert the cylinder of clean HCFC−22 and open its
valve to allow liquid refrigerant 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
indoor unit coil before it enters the recovery machine.
4. 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 recovered. Allow the
recovery machine to pull a vacuum on the system.
5. 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.
6. Use dry nitrogen to break the vacuum on the
refrigerant lines and indoor unit coil before removing
the recovery machine, gauges and refrigerant drum.
Installing New Indoor Unit Metering
Device
XC14 units can be configured for use in with HFC−410A
fixed orifice or TXV metering devices. This section
provides instructions on installing either a fixed orifice or
TXV refrigerant metering device.
1
2
3
4
5
6
7
8
9
10
11
12
1/8 TURN
1
2
3
4
5
6
7
8
9
10
11
12
1/2 TURN
Figure 23. Tightening Distance
TYPICAL FIXED ORIFICE INSTALLATION
PROCEDURE
1. Remove the field−provided fitting that temporary
reconnected the liquid line to the indoor unit’s liquid
line orifice housing.
2. Ensure that the fixed orifice supplied with the outdoor
unit is installed with the nylon seat pointing toward the
distributor assembly.
3. Apply a small amount of refrigerant oil on the Teflon
ring and insert the Teflon ring securely into the orifice
housing.
4. Attached the liquid line assembly to the liquid line
orifice housing. Finger tighten and use an appropriately
sized wrench to turn an additional 1/2 turn clockwise
as illustrated in figure 23, or 20 ft−lb.
5. Place the supplied fixed orifice sticker on the indoor
cabinet after installation.
TEFLON
RING
LIQUID
LINE
FIXED
ORIFICE
(Uncased
Coil Shown)
LIQUID LINE ASSEMBLY
WITH BRASS NUT
LIQUID LINE
ORIFICE HOUSING
Figure 24. Typical Fixed Orifice Installation
Table 3 lists both the Lennox catalog and part numbers for
the fixed orifice kit provided with each unit model. In
non−standard applications, the provided fixed orifice kit
may not be appropriate. Figure 25 illustrates the kit
components and quantities.
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