Testing For Leaks - Lennox XC14 Installation Instructions Manual

6. Attach the suction line sensing bulb in the proper
orientation as illustrated in figure 27 using the clamp
and screws provided.
NOTE − Insulating the sensing bulb once installed may be
required when the bulb location is external to the coil
casing.
SUCTION LINE
12
BULB
SUCTION LINE
12
BULB
NOTE − Never mount on bottom of line.
Figure 27. 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 28.
IMPORTANT
When removing the flare nut, ensure that the copper
flare seal bonnet is removed.
FLARE SEAL
CAP
Figure 28. 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 23.
See the XC14 Engineering Handbook for approved TXV
indoor/outdoor unit
information. Table 4 lists both the Lennox catalog and part
numbers for the TXV kit required for each unit model.
Figure 29 illustrates the kit components and quantities.
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 NUT
COPPER
OR FLARE SEAL
BONNET
MALE BRASS EQUALIZER
LINE FITTING
SUCTION LINE
match−ups and application
Table 4. Indoor Unit TXV Kits
Model
−018, 024, 030 and 036
−042
−048 and 060
Use the Lennox catalog number to order a TXV kit.
The indoor unit TXV kit includes the following components:
TEFLON
RINGS (2)
COPPER
MOUNTING
STRAP (1)
Figure 29. TXV Kit Components

Testing for Leaks

After the line set has been connected to both the indoor
and outdoor units, check the line set connections and
indoor unit for leaks. Use the following procedure to test for
leaks:
Leak detector must be capable of sensing HFC
refrigerant.
Refrigerant can be harmful if it is inhaled.
Refrigerant must
responsibly.
Failure to follow this warning may result in personal
injury or death.
Fire, Explosion and Personal Safety
Hazard.
Failure to follow this warning could
result in damage, personal injury or
death.
Never use oxygen to pressurize or
purge refrigeration lines. Oxygen,
when exposed to a spark or open
flame, can cause damage by fire and/
or an explosion, that could result in
personal injury or death.
1. Connect an HFC−410A manifold gauge set high
pressure hose to the suction valve service port.
Page 15
Catalog Number Part Number
37L51 37L5101
39L72 39L7201
91M02 100188−02
TXV (1)
HEX HEAD BOLTS
IMPORTANT
WARNING
be used and
WARNING
AND NUTS (2)
recovered
XC14 SERIES