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13ACD SERIES
TWO PIECE
PATCH PLATE
(UNCASED COIL
ONLY)
SUCTION
LINE
LIQUID LINE
ORIFICE
HOUSING
DISTRIBUTOR
TUBES
LIQUID
LINE
MALE EQUALIZER LINE
FITTING (SEE
FIGURE 22 FOR
FURTHER DETAILS)
SENSING
LINE
EQUALIZER
LINE
TXV
TEFLON
RING
(Uncased Coil Shown)
Sensing bulb insulation is
required if mounted external to
the coil casing. See figure 21 for
bulb positioning.
STUB END
TEFLON
RING
LIQUID LINE ASSEMBLY
WITH BRASS NUT
DISTRIBUTOR
ASSEMBLY
Figure 20. Typical TXV Installation
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
On lines smaller than
7/8", mount sensing bulb
at either the 3 or 9 o’clock
position.
Bulb
12
Bulb
Bulb
Bulb
Suction Line
Suction Line
NOTE − Never mount on bottom of line.
Figure 21. TXV Sensing Bulb Installation
6. 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 22.
IMPORTANT
When removing the brass nut, ensure that the
copper flare seal bonnet is removed.
SUCTION LINE
FLARE NUT
COPPER
FLARE SEAL
BONNET
MALE BRASS EQUALIZER
LINE FITTING
FLARE SEAL
CAP
OR
Figure 22. Copper Flare Seal Bonnet Removal
7. 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 17.
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.
See the 13ACD Engineering Handbook for approved TXV
match−ups and application information.
Table 4. Indoor TXV Indoor Kits
Model
Catalog
Number
Part
Number
−018, −024, −030 and −036 26K34 LB−85663J
−042, −048 and −060 26K35 LB−85663k
Use the Lennox catalog number to order a TXV kit.
The above reference kits include:
1 TXV
2 Teflon rings
1 1 1/4" wide copper mounting strap for sensing bulb
2 #10 hex head bolts and nuts for securing sensing bulb
TXV (1)
COPPER
MOUNTING
STRAP (1)
HEX HEAD BOLTS
AND NUTS (2)
TEFLON
RINGS (2)
Figure 23. TXV Kit Components
Testing for Leaks
IMPORTANT
Leak detector must be capable of sensing HFC
refrigerant.
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