Installing New Indoor Unit Metering Device - Lennox Elite Series XP13 Units Installation Instructions Manual

INVERTED HCFC−22 CYLINDER
CONTAINS CLEAN HCFC−22 TO
BE USED FOR FLUSHING.
SUCTION LINE
SERVICE VALVE
EXISTING
INDOOR unit
LIQUID LINE SERVICE VALVE
RECOVERY
CYLINDER
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:
S
Two clean HCFC−22 recovery bottles,
S
Oilless recovery machine with pump-down feature,
S
Two gauge sets (one for HCFC−22; one for
HFC−410A).
FLUSHING PROCEDURE
1. Connect the following:
S
HCFC−22 cylinder with clean refrigerant to the
suction service valve,
S
HCFC−22 gauge set to the liquid line valve,
S
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.
Installing New Indoor Metering Device
XP13 units use CTXV for metering refrigerant only. This
section provides instructions
refrigerant metering device.
GAUGE
MANIFOLD
LOW HIGH
PRESSURE PRESSURE
NEW
OUTDOOR
UNIT
CLOSED
OPENED
TANK
RETURN
INLET
DISCHARGE
RECOVERY MACHINE
on installing
11 12
10
9
8
7
TYPICAL CTXV INSTALLATION PROCEDURE
TWO PIECE
PATCH PLATE
(UNCASED COIL
ONLY)
DISTRIBUTOR
TUBES
DISTRIBUTOR
ASSEMBLY
MALE EQUALIZER LINE
FITTING (SEE FIGURE 26
FOR FURTHER DETAILS)
SENSING
REQUIRED IF MOUNTED EXTERNAL
TO THE COIL CASING. SEE FIGURE 25
FOR BULB POSITIONING.
Figure 24. Typical TXV Installation
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.
1. Remove the field−provided fitting that temporary
reconnected the liquid line to the indoor unit's
distributor assembly.
2. Install one of the provided Teflon rings around the
stubbed end of the CTXV and lightly lubricate the
connector threads and expose surface of the Teflon
ring with refrigerant oil.
3. Attach the stubbed end of the CTXV 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.
CTXV
4. Place the remaining Teflon washer around the other
end of the CTXV. Lightly lubricate connector threads
Page 13
1/8 TURN
11 12
1
10
2
9
3
4
8
7
5
6
Figure 23. Tightening Distance
(Uncased Coil Shown)
LIQUID LINE
STUB END
ORIFICE
HOUSING
CTXV
TEFLON
RING
EQUALIZER
LINE
LIQUID LINE ASSEMBLY
WITH BRASS NUT
SUCTION
LINE
BULB INSULATION IS
1/2 TURN
1
2
3
4
5
6
TEFLON
RING
SENSING
LINE
LIQUID
LINE
XP13 SERIES