IO-123163 Effective 01-14-2016
7
If the TXV sensing bulb is mounted
vertically, the capillary MUST be directed
upwards. The bulb must be mounted on
the wall opposite to that being directly hit by the refrigerant
and oil leaving the distributor tubes.
CAUTION
!
II. TXV Bulb Vertical Mounting
Fig 8B-3. Recommended location
for vertical TXV bulb mount
The TXV sensing bulb should
be mounted in a horizontal
plane in relation to the suction/
vapor line. However, some
installation
configurations
may require that the sensing
bulb be mounted vertically.
In this instance, place the
bulb opposite the piping wall
being hit by refrigerant and
oil leaving the distributor
tubes, and with capillary tubes
directed upwards as shown in
Fig. 8B-3.
Note: Photos are for basic illustration purposes only. Actual
equipment configuration may differ from that shown.
III. Field-Installed TXV Retrofit
When installing an expansion valve, it is not necessary to slide the
coil out of the housing.
III-1.
Inspect the TXV box to confirm that the valve is compatible
with the refrigerant in the system.
Male
(Inlet)
Female
(Outlet)
III-2.
Remove the valve from
the box and note the location
of the inlet side (threaded
male port) and the outlet side
(female swivel nut port).
III-5.
Braze the stub-out portion to the liquid line and let cool.
III-4.
Slide the attachment nut onto the liquid line stub out
(See 8A, I-3)
Do not attempt to touch brazed joints
while hot. Severe burns may result.
!
WARNING
III-3.
After ensuring that the
Teflon O-ring seal is still in place
inside the flowrator body, screw
the female swivel nut onto the
flowrator body.
III-6.
Remove the additional
Teflon O-ring seal from the box
and place on the shoulder just
inside the TXV inlet port. Screw
the nut attached to the stub-out
portion of the flowrator body onto
the inlet port of the TXV.
A.
Remove the valve stem from
the Schrader port mounted on the
suction line.
III-7.
Tighten all connections taking care to use proper back up.
III-9a.
Some Aspen coils come with a Schrader valve on the suction
line.
If a Schrader port is present:
III-8.
Remove the valve identification sticker from the valve and
place it adjacent to the Aspen model number on unit name plate.
For disassembly and piston removal refer to section 8A-I.
B.
Screw flare nut on TXV
equalization tube on to the
Schrader valve stem.
III-9b.
In some cases, a suction line schrader port may not be
present.
If a Schrader port is NOT present:
When handling or manipulating the
equalizer tube, take great care not to kink
or make extreme bends in the tubing.
CAUTION
!
A.
Install a field-supplied braze-on schrader
valve like that shown on the suction line near
the intended sensing bulb mounting location.
Follow valve manufacturer instructions and
recommendations for installation.
B.
Attach equalizer tube to valve as described in
section III-9a above.
III-10.
Mount the sensing bulb as described in section 8B-I or 8B-II.
