Omega OTEC IECS-D Series, Technical Manual

Page: 41 / 67

121
3. After the refrigerant pipe is connected to the IDU and ODU, discharge the air according to the column Air
Discharge. After the air is discharged, tighten the service nut.
Precautions for flexible pipes:
• Do not bend a pipe more than 90 degrees (see the figure below).
• The bend should be as close as possible to the center of the tube and the bend radius should not be less than
3.5D (pipe diameter).
• Do not bend the flexible tube back and forth more than 3 times.
Bend a thin-walled connecting pipe (see the figure below):
• When bending a pipe, cut off the required recess in the insulation pipe at the bend and expose the pipe (wrap
the bend with a binding tie after bending).
• Keep the elbow radius as much as possible to prevent flattening or crushing. Use a pipe bender to make tight
elbows.
If a copper pipe purchased from the market is used, the heat insulation material of the copper pipe must be the
same (thicker than 10mm, the thickness should be increased if the unit is installed in a closed humid place).
7.3 Pipe layout
1. Bend the pipe or drill a hole in the wall as needed. The cross-sectional area of the pipe bending deformation
must not exceed 1/3 of the original pipe section. A protective casing should be provided at the wall or floor
hole. The weld joint must not be inside the casing. The drill hole on the external wall must be sealed and tightly
wrapped with a binding tie to prevent impurities from entering the pipe. The pipe must be insulated with an
insulation pipe of suitable size.
2. Insert the bundled piping and wiring from outside the room through the wall opening into the room. Be
careful when laying out the pipes. Do not damage them.
Vacuum the connecting pipe.
After completing the above steps, the check valve stem of the ODU should be fully opened to ensure that the
refrigerant pipeline of the IDU and ODU is unobstructed.
Use a leak detector or soapy water to carefully check for leakage and ensure that there is no leakage. Cover
the joint of the IDU with a sound/heat insulation sleeve (accessory) and wrap it tightly with a binding tie to
prevent condensation and water leakage.
7.4 Pipe connection
Flaring
Use a pipe cutter to cut off the pipe, and rotate the pipe cutter repeatedly to cut off the pipe.
Bend the pipe with your thumbs
Method of unwinding the coil:
Straighten the pipe end