NOTICE
To prevent moisture and contaminates from entering the system, the coil must not be open to
atmosphere for extended periods of time. If the coil cannot be brazed into the refrigeration system
during a routine installation period, the ends must be temporarily closed or plugged. For a short term
delay, use masking tape over the ends of the copper tubing to close the tube from the air. For a longer
term delay, use plugs or caps. There is no need to purge the coil if this procedure is followed.
1. Relieve the holding charge by depressing the Schrader valve core on the suction manifold
stub out.
2. When the holding charge is completely discharged, loosen and remove the Schrader valve
core.
3. Place a backup wrench on the distributor, then 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 quarter turn to seal.
See Figure 10.
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 10.
Hand tighten the liquid line and apply an additional quarter 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.
Installation Manual: R-454B Outdoor Split-System Air Conditioner28
Johnson Controls Ducted Systems
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