CAUTION
Do not connect manifold gauges unless trouble
is suspected. Approximately 3/4 ounce of
refrigerant will be lost each time a standard
manifold gauge is connected.
WARNING
Never attempt to repair any brazed connections
while the system is under pressure. Personal
injury could result.
Indoor expansion device
Thermostatic expansion valve (TXV)
installation
About this task:
The following are the basic steps for installation. For
detailed instructions, refer to the Installation Instructions
accompanying the TXV kit. Install TXV kit as follows:
Important: Refer to the Technical Guide for the unit
to determine the proper TXV kit to be used on this
product.
1. Relieve the holding charge by depressing Schrader
core on the suction manifold stub out.
2. After holding charge is completely discharged,
loosen and remove the Schrader core.
3. Place a backup wrench on distributor, loosen and
remove brass distributor nut. Retain brass nut for
use on liquid line. Keep PTFE washer in place and
discard clear disk.
4. Install the thermal expansion valve to the
distributor assembly with supplied fittings. Ensure
PTFE washer is seated in distributor. Hand tighten
and turn an additional 1/4 turn to seal. Do not over-
tighten fittings. See Figure 6.
CAUTION
Do not over-torque. Do not use slip joint pliers.
This will distort the aluminum distributor and
the brass fitting (potentially causing leaks).
5. Slide the nut removed in Step 3 over the supplied
liquid line. Place supplied PTFE washer from TXV kit
in place on TXV, and install liquid line to the top of
the thermal expansion valve. Adjust assembly so
liquid line aligns with hole in access panel. Hand
tighten the liquid line, and apply an additional 1/4
turn to seal.
WARNING
Schrader valve core must not be installed with
TXV installation. Poor system performance or
system failure could result.
Figure 6: 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 7.
R-410A Outdoor Split-System Heat Pump Installation Manual - YH2E / THE2 / RHP143 Series12
Johnson Controls Ducted Systems
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