IO-123084-GAW-063017
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©2017 AirMark
CAUTION
Pay close attention to the piston
orientation. The pointed end of the piston
MUST
go into the distributor body/towards the
coil. Failure to ensure this orientation will
cause the piston to be bypassed during
operation which might damage the outdoor
unit.
6) Assemble the two halves correctly and
ensure that the white Teflon O-ring is
present between the two halves.
7) Slide the 13/16 nut onto the distributor
body.
8) Tighten the nut to a torque of
approximately 10-30 ft-lbs. Do
NOT
over
tighten the nut. This will hamper the piston
movement during operation.
9) Slide the grommet back to position to
prevent air leakage.
TXV Coils:
WARNING
The sensing bulb and TXV body
MUST
be protected from overheating during
brazing. The sensing bulb and TXV body must be
covered using a quench cloth or wet cloth when
brazing. Pointing the brazing flame away from the
valve and sensing bulb provide partial protection
only.
CAUTION
Ensure that the TXV selected is
compatible with the refrigerant used in the outdoor
system (R22 or R410A). TXV caps are painted
green for R22 or pink for R410A. In absence of
color, the caps will be marked with the compatible
refrigerant.
CAUTION
The valves should be sized
according to the capacity of the outdoor unit.
Failure to install the right valve can lead to poor
performance and possible compressor damage.
TXV Bulb Mounting
The orientation and location of the TXV bulb has a
major influence on the system performance.
CAUTION
Ensure that the TXV bulb is in
direct contact with the suction/vapor line. Gaps
between the bulb and tube should be avoided.
Failure to eliminate gaps will impair the proper
functioning of the TXV valve.
It is recommended that the TXV bulb be installed
parallel to the ground (in a horizontal plane). The
bulb position should be above and between 4
o’clock and 8 o’clock. Fig. 4 shows the
recommended position for the TXV bulb
installation in the horizontal plane.
The TXV sensing bulb
SHOULD
be mounted
using the metal clamp provided. In order to obtain
a good temperature reading and correct superheat
control, the TXV sensing bulb must conform to
ALL of the following criteria:
1) The sensing bulb
MUST
be in direct and
continuous contact with the suction line
2) The sensing bulb should be mounted
horizontally on the suction line.
3) The sensing bulb must be mounted above
and between the 4 and 8 o’clock position
on the circumference of the suction line.
4) The sensing bulb
MUST
be insulated from
outside air.
TXV BULB POSITION
4 O'CLOCK OR
8 O'CLOCK
METAL STRAP
SUCTION/VAPOR LINE
Fig.4. Recommended location of the TXV bulb in a
horizontal orientation
The mounting location and insulation guards the
sensing bulb from false reading due to hot outside
air or liquid refrigerant formed inside the
suction/vapor line.
As recommended earlier, the TXV sensing bulb
should be mounted in a horizontal plane in relation
to the suction/vapor line. However, in case such a
mounting is not feasible and the sensing bulb has