Testing For Leaks - Lennox Merit Series13ACD Installation Instructions Manual

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 22 FOR
FURTHER DETAILS)
Sensing bulb insulation is
required if mounted external to
the coil casing. See figure 21 for
bulb positioning.
Figure 20. Typical TXV Installation
Suction Line
12
Bulb
Suction Line
12
Bulb
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.
STUB END
TXV
TEFLON
RING
TEFLON
RING
SENSING
LINE
LIQUID LINE ASSEMBLY
WITH BRASS NUT
SUCTION
LINE
LIQUID
LINE
On lines smaller than
7/8", mount sensing bulb
at either the 3 or 9 o'clock
position.
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.
Bulb
FLARE SEAL
CAP
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
−018, −024, −030 and −036
−042, −048 and −060
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
TEFLON
RINGS (2)
COPPER
MOUNTING
STRAP (1)
Figure 23. TXV Kit Components

Testing for Leaks

Leak detector must be capable of sensing HFC
refrigerant.
Page 11
FLARE NUT
OR FLARE SEAL
MALE BRASS EQUALIZER
LINE FITTING
SUCTION LINE
Catalog
Number
26K34
26K35
TXV (1)
HEX HEAD BOLTS
IMPORTANT
COPPER
BONNET
Part
Number
LB−85663J
LB−85663k
AND NUTS (2)
13ACD SERIES