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Figure 3 — Installing Refrigerant Tubing
Sweat Style Tubing Connections: Sweat
Indoor Unit and Sweat Outdoor Unit
Use only refrigeration grade (dehydrated and sealed) copper
tubing. Care must be taken to insure that the tubing is kept clean
and dry before and during installation. Do not remove the plugs
from the tubing ends, coil connections or base valves until the
connection is ready to be brazed.
The suction line must be insulated with a minimum of 3/8"
Armaflex or equivalent before cutting and making connections.
Step 1. Being careful not to kink, route both the suction line and
liquid line between the indoor unit and outdoor unit. Use
a tubing bender to make any necessary bends in tubing.
When necessary to bend the insulated tube suction line,
cut the insulation around its circumference at a distance
far enough beyond the point of the bend so as to clear the
tubing bender. Slip the insulation back together and
vapor seal the joint with tape. Coil any excess tubing in a
horizontal place with the slope of the tubing toward the
condensing unit. See Figure 3.
CAUTION
1. Be careful not to tear the insulation when
pushing it through hole in masonry or frame
walls.
2. When sealing the tube opening in
house wall, use a soft material to prevent tube
damage and vibration transmission. 3. Avoid
excessive bending in any one place to avoid
kinking.
Step 2.
The tubing ends should be cut square. Make sure it is
round and free of burrs at the connecting ends. Clean
the tubing to prevent contaminants from entering the
system.
NOTE: Do not braze line to units! If orifice needs to be
changed, change out orifice first.
If the orifice does not have to be changed, skip the
instructions outlined further in Step 3 and proceed to
Step 8.
Step 3.
Disassemble Flow Control Assembly by turning
body hex.
Step 4.
If existing orifice has not dropped out of the body when
disassembled, remove by using a pin or paper clip.
Discard this original orifice.
Step 5.
Insert proper sized orifice fully into the flow control
body with rounded "bullet" nose towards the unit as
shown. Insure the orifice stays inserted in body before
connecting mating half. See chart in the outdoor unit
installation instructions for proper size.
CAUTION
Be sure there is no dirt introduced into the
flow control —orifice assembly. Be sure to
install the orifice with the bullet nose pointing
in the proper direction as shown in Figure 4.
Failure to do so will result in improper
operation.
Figure 4 — Flow Control Assembly Field Orifice
Replacement Instructions
Step 6.
Thread assembly halves together by hand to insure
proper mating of threads and tighten until bodies
"bottom" or a definite resistance is felt.
Step 7.
Using a marker pen or ink pen, mark a line lengthwise
from the union nut to the bulkhead. Then tighten an
additional 1/6 turn (or 1 hex flat). The misalignment of
the line will show the amount the assembly has been
tightened. This final 1/6 turn is necessary to insure the
formation of the leakproof joint.
Page 5
Manual 2100-292
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