Lennox XC14 Installation Instructions Manual page 14

Table 3. Indoor Unit Fixed Orifice Kits
Model Catalog Number Part Number
XC14−018 97M74
XC14−024 97M75
XC14−030 97M76
XC14−036 11W02
XC14−042 97M78
XC14−048 11W07
XC14−060 11W11
Use the Lennox catalog number to order a new or replacement fixed
orifice kit.
The fixed orifice kit includes the following components:
Figure 25. Fixed Orifice Kit Components
TYPICAL TXV INSTALLATION PROCEDURE
The TXV 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 TXV in a
manner that will provide access for field servicing of the
TXV. Refer to Figure 26 for reference during installation of
TXV unit.
To prevent any possibility of water damage, properly
insulate all parts of the TXV assembly that may sweat due
to temperature differences between the valve and its
surrounding ambient temperatures.
505367M 04/08
Drill Size
100484−06 0.053
100484−08 0.057
100484−13 0.063
100484−22 0.073
100484−24 0.076
100484−31 0.083
100484−40 0.093
FIXED ORIFICE (1)
FIXED ORIFICE
EXTRACTOR (1)
TEFLON RING (1)
FIXED ORIFICE STICKER (1)
TWO PIECE
PATCH PLATE
(UNCASED COIL
ONLY)
LIQUID LINE
HOUSING
DISTRIBUTOR
TUBES
DISTRIBUTOR
ASSEMBLY
MALE EQUALIZER LINE
FITTING (SEE FIGURE 28
FOR FURTHER DETAILS
SENSING BULB
REQUIRED IF MOUNTED EXTERNAL
TO THE COIL CASING. SEE FIGURE 27
FOR BULB POSITIONING.
Figure 26. Typical TXV Installation
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 TXV and lightly lubricate the
connector threads and expose surface of the Teflon
ring with refrigerant oil.
3. Attach the stubbed end of the TXV 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.
4. Place the remaining Teflon ring around the other end
of the TXV. Lightly lubricate connector threads and
expose surface of the Teflon ring with refrigerant oil.
5. Attach the liquid line assembly to the TXV. 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.
Page 14
(Uncased Coil Shown)
STUB END
ORIFICE
TXV
TEFLON
RING
EQUALIZER
LINE
LIQUID LINE ASSEMBLY
WITH BRASS NUT
SUCTION
LINE
)
INSULATION IS
TEFLON
RING
SENSING
LINE
LIQUID
LINE