2. When the holding charge is completely discharged,
loosen and remove the Schrader valve core.
3. Place a backup wrench on the distributor, and
loosen and remove the brass distributor nut. Retain
the brass nut for use on the liquid line. Keep the
PTFE washer in place and discard the sealing disk.
4. Install the TXV onto the distributor assembly with
the supplied fittings. Ensure the PTFE washer is
seated in the distributor. Hand tighten and turn an
additional 1/4 turn to seal. See Figure 8.
Note: Do not overtighten the fittings.
CAUTION
Do not over-tighten. Do not use slip joint pliers.
This distorts the aluminum distributor and the
brass fitting (potentially causing leaks).
5. Slide the nut removed in Step 3 over the supplied
liquid line. Place the supplied PTFE washer from
the TXV kit in place on the TXV and install the liquid
line to the top of the TXV. Adjust the distributor
assembly so the liquid line aligns with the hole in
the access panel. See Figure 8. Hand tighten the
liquid line and apply an additional 1/4 turn to seal.
CAUTION
The Schrader valve core must not be
installed into the suction line TXV equalizer
line fitting. Poor system performance or system
failure could result.
Figure 8: TXV installation
6. Install the TXV equalizer line onto the vapor line by
hand tightening the 1/4 in. SAE coupling nut to the
equalizer fitting and apply an additional 1/3 turn to
seal. See Figure 9.
CAUTION
Mount the TXV temperature sensing bulb after
the vapor line is brazed and sufficiently cooled.
Failure to use a suction-line split grommet may
result in TXV failure.
7. Route the temperature sensing bulb tube for the
TXV toward the vapor line header and the TXV
equalizer tube connection port on the vapor line
header.
8. Install the TXV bulb to the vapor line near the TXV
equalizer tube connection port, using the bulb
clamps supplied with the TXV assembly. Ensure
that the bulb makes maximum contact. See Figure
9 and Figure 10 and adhere to the following:
a. Install the TXV bulb on the vapor line suction
header near the TXV equalizer tube connection
port. Ensure that the bulb is installed at a 10
o’clock or 2 o’clock position.
b. Insulate the TXV bulb using the thermal
insulation provided to protect it from the effect
of the surrounding ambient temperature. Cover
the bulb completely to insulate it.
9. When the refrigeration piping is installed, leak test
the system.
Figure 9: TXV bulb and equalizer line installation
Installation Manual: R-410A Outdoor Split-System Air Conditioner12
Johnson Controls Ducted Systems
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