Required Equipment; Flushing Procedure - Lennox Elite Series Installation Instructions Manual

If theoriginal s ystem used:
• HCFC-22 r efrigerant, thenflushthesystem using the
procedure p rovided inthissection,
• HFC-410A refrigerant, thenproceed to
Installing New
Refrigerant Metering Device.
INVERTED HCFC-22 CYLINDER
/ CONTAINS CLEAN HCFC-22 TO
BE USED FOR FLUSHING. GAUGE
!O_ U'! MANIFOLD
LOW HIGH
I PRESSURE PRESSURE
suc t'_
SERVICE VALVE _ _
I : _'_ :I '_J
/\/\ _=n _ _ i-g h,
/ \ _ i I u" w _ ,_ 'U
OPENEDII II CLOSED
RECOVERY
CYLINDER
RECOVERY MACHINE
NOTE - THE INVERTED HCFC-22 CYLINDER MUST CONTAIN AT LEAST THE SAME
AMOUNT OF REFRIGERANT AS WAS RECOVERED FROM THE EXISTING SYSTEM,
Figure 22. Typical Flushing Connection
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).
FLUSHING 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.
XP16 units use CTXV for metering refrigerant only. This
section provides instructions on installing CTXV
refrigerant metering device.
1/2 TURN
Figure 23. Tightening Distance
TYPICAL CTXV INSTALLATION PROCEDURE
The CTXV unit can be installed internal or external to the
indoor coil. In applications where an uncased coil is being
installed in a field-provided plenum, install the CTXV in a
manner that will provide access for field servicing of the
CTXV, Refer to Figure 24 for reference during installation
of CTXV unit.
TWO PIECE (Uncased Coil Shown)
PATCH PLATE
UNCASED COIL
ONLY) LIQUID LINE
. .'_ORIFICE STUB END
HOUSING
DISTRIBUTOR
CTXV
TUBES. -
RING
SENSING
LINE
MALE EQUALIZER LINE
FITTING (SEE FIGURE 26
FOR FURTHER DETAILS)
LINE
SENSING BULB INSULATION IS
REQUIRED IF MOUNTED EXTERNAL
TO THE COIL CASING SEE FIGURE 25
FOR BULB POSITIONING.
LIQUID
LINE
Figure 24. Typical CTXV Installation
1, Remove the field-provided fitting that temporary
reconnected the liquid line to the indoor unit's
distributor assembly,
Page13
XP16 SERIES