Lennox TSA036H4N41 Installation Instructions Manual page 11

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 and
provide an access for field servicing of the TXV. Refer to
Figure 21 for reference during installation of TXV unit.
TWO PIECE
(Uncased Coil Shown)
PATCH PLATE
(UNCASED COIL
ONLY)
LIQUID LINE
ORIFICE
HOUSING
DISTRIBUTOR
TUBES
DISTRIBUTOR
EQUALIZER
ASSEMBLY
LINE
MALE EQUALIZER LINE
FITTING (SEE FIGURE 23
FOR FURTHER DETAILS)
SENSING BULB INSULATION IS REQUIRED
IF MOUNTED EXTERNAL TO THE COIL
CASING. SEE FIGURE 22 FOR BULB
POSITIONING.
Figure 21. Typical TXV Installation
1. Remove the field−provided fitting that temporary
reconnected the liquid line to the indoor unit's liquid
line orifice housing.
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 kit valve 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 19, or 20 ft−lb.
4. Place the remaining Teflon washer 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
19, or 20 ft−lb.
STUB END
TXV
TEFLON
RING
TEFLON
RING
SENSING
LINE
LIQUID LINE ASSEMBLY
WITH BRASS NUT
SUCTION
LINE
LIQUID
LINE
6. Attach the sensing bulb of the TXV in the proper
orientation as illustrated in figure 22 to the suction line
using the clamp and screws provided.
SUCTION LINE
BULB
SUCTION LINE
BULB
Figure 22. TXV Sensing Bulb Installation
7. Remove and discard either the flare seal cap or flare
nut with copper flare seal bonnet from the equalizer
line port on the suction line.
IMPORTANT
When removing the seal nut, ensure that the copper
flare seal bonnet is removed.
FLARE SEAL
CAP
Figure 23. Copper Flare Seal Bonnet Removal
8. Connect the equalizer line from the TXV to the
equalizer suction port on the suction line. Finger
tighten the flare nut plus 1/8 turn (7 ft−lbs) as illustrated
in figure 19.
NOTE − 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.
Page 11
ON LINES SMALLER THAN
7/8", MOUNT SENSING BULB
AT EITHER THE 3 OR 9
O'CLOCK POSITION.
12
BULB
ON 7/8" AND LARGER LINES,
MOUNT SENSING BULB AT
EITHER THE 4 OR 8 O'CLOCK
POSITION. NEVER MOUNT
ON BOTTOM OF LINE.
12
BULB
NOTE − NEVER MOUNT ON
BOTTOM OF LINE.
FLARE NUT
COPPER
OR FLARE SEAL
BONNET
MALE BRASS EQUALIZER
LINE FITTING
SUCTION LINE
TSA*H4 SERIES