Testing For Leaks - Lennox Elite Series XP13 Units Installation Instructions Manual

and expose surface of the Teflon ring with refrigerant
oil.
5. Attach the liquid line assembly to the CTXV. Finger
tighten and use an appropriately sized wrench to turn
an additional 1/2 turn clockwise as illustrated in figure
23, or 20 ft−lb.
6. Attach the suction line sensing bulb in the proper
orientation as illustrated in figure 25 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 25. 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 26.
IMPORTANT
When removing the flare nut, ensure that the copper
flare seal bonnet is removed.
FLARE SEAL
CAP
Figure 26. Copper Flare Seal Bonnet Removal
506270−01 05/09
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
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.
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 XP13 Engineering Handbook for approved CTXV
kit match−ups and application information.
The reference CTXV kits include:
1 CTXV
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 27. CTXV Kit Components

Testing for Leaks

After the line set has been connected to the indoor unit and
air conditioner, 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
responsibly.
Failure to follow this warning may result in personal
injury or death.
When using a high pressure gas such
as dry nitrogen to pressurize a
refrigeration
system, use a regulator that can
control the pressure down to 1 or 2
psig (6.9 to 13.8 kPa).
Page 14
CTXV (1)
IMPORTANT
WARNING
must be used and
WARNING
or air
HEX HEAD BOLTS
AND NUTS (2)
recovered
conditioning