IO-123090-GFW-020113
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©2013 AirMark
Fig.5. Figure showing the sensing bulb mounted in a
vertical orientation
CAUTION
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.
Field – Installed Expansion Valve Coils
Remove the valve identification sticker from the
valve and place it adjacent to the Airmark model
number on unit name plate.
When installing an expansion valve, it is not
necessary to remove all the access panels and
slide the coil out of the housing.
1) Disassemble the flowrator body using two
wrenches. Unscrew the body with a
counter-clockwise motion.
2) Replace the white Teflon seal in place
(located between the halves).
3) Remove the existing flowrator piston using
a small wire or pick.
4) Inspect the TXV box to confirm that the
valve is compatible with the refrigerant in
the system.
5) 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).
6) After ensuring that the white Teflon seal is
still in place inside the flowrator body,
screw the female swivel nut onto the
flowrator body.
7) Place the attachment nut on the liquid line.
8) Braze the stub-out portion to the liquid line
and let cool.
WARNING
Do not attempt to touch the braze
joint while hot. Touching it may cause severe
burns.
9) Remove the additional white Teflon seal
ring from the box and place on the
shoulder just inside the inlet port. Screw
the nut attached to the stub-out portion of
the flowrator body onto the inlet port of the
TXV.
10) Tighten all connections taking care to use
proper back up.
Some Airmark coils come with a Schrader valve on
the suction line. If a Schrader port is present
11) Remove valve stem from the Schrader port
mounted on the suction line
12) Screw flare nut on TXV equalization tube
in to the Schrader valve stem
Coils without Schrader Ports
13) Locate a convenient spot on the suction
line and punch a ¼” hole with a pick or
other suitable tool.
CAUTION
Do
NOT
drill a hole as chips will
enter suction manifold.
14) Insert TXV equalizer tube approximately
3/8” into the hole and apply solder to seal.
