Lennox Merit Series 13ACX Installation Instructions Manual page 12

TWO PIECE
(Uncased Coil Shown)
PATCH PLATE
(UNCASED COIL
ONLY)
LIQUID LINE
ORIFICE
HOUSING
DISTRIBUTOR
TUBES
DISTRIBUTOR
EQUALIZER
ASSEMBLY
LINE
LINE
MALE EQUALIZER
FITTING (SEE FIGURE 25
)
FOR FURTHER DETAILS
SENSING BULB INSULATION
REQUIRED IF MOUNTED EXTERNAL
TO THE COIL CASING. SEE FIGURE 24
FOR BULB POSITIONING.
Figure 23. Typical TXV Installation
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.
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 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 1/22 turn clockwise as illustrated in figure
19, or 20 ft−lb.
6. Attach the suction line sensing bulb in the proper
orientation as illustrated in figure 24 using the copper
mounting strap and fastening hardware provided.
506081−01 09/08
STUB END
TXV
TEFLON
RING
TEFLON
RING
SENSING
LINE
LIQUID LINE ASSEMBLY
WITH BRASS NUT
SUCTION
LINE
LIQUID
LINE
IS
NOTE − Insulating the sensing bulb once installed may be
required when the bulb location is external to the coil
casing.
SUCTION LINE
BULB
SUCTION LINE
BULB
Figure 24. 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 as illustrated in figure 25.
IMPORTANT
When removing the flare nut, ensure that the copper
flare seal bonnet is removed.
FLARE SEAL
CAP
Figure 25. 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.
Page 12
ON LINES SMALLER THAN 7/8",
MOUNT SENSING
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
BULB AT