Ecoer EAHAEC-36 - 5.8 Additional Refrigerant Charge; 5.9 Engineering of Insulation; 5.9.1 Insulation of refrigerant pipe

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May. 2023Manufacturer reserves the right to change specifications or designs without notice.
• After the vacuum drying process is carried out, the additional refrigerant charge process need to be performed.
• The outdoor unit is factory charged with refrigerant. The additional refrigerant charge volume is decided by the
diameter and length of the liquid pipe between indoor and outdoor unit. Refer the following formula to calculate
the charge volume.
Diameter of liquid pipe (mm(inch))
Formula
R410A(Throttling part
in the indoor unit)
9.52(3/8)
V=65(0.69)g/m(oz/ft)×(L- standard pipe length)
V: Additional refrigerant charge volume.
L : The length of the liquid pipe.
Note:
5.8 Additional Refrigerant Charge
1.Operational procedure of refrigerant pipe insulation
Cut the suitable pipe → insulation (except joint section) → flare the pipe → piping layout and connection→ vacuum
drying → insulate the joint parts
2. Purpose of refrigerant pipe insulation
• During operation, temperature of gas pipe and liquid pipe shall be over-heating or over-cooling extremely.
Therefore, it is necessary to carry out in- sulation; otherwise it shall debase the performance of unit and burn
compressor.
• Gas pipe temperature is very low during cooling. If insulation is not enough, it shall form dew and cause
leakage.
• Temperature of gas pipe is very high (generally 122-212℉) during heating. Insulation work must be carried
out to prevent hurt by carelessness touching.
3. Insulation material selection for refrigerant pipe
• The burning performance should over 24 8℉
• According to the local law to choose insulation materials
• The thickness of insulation layer shall be above 10mm.If in hot or wet environment place, the layer of
insulation should be thicker accordingly.
5.9 Engineering of Insulation
5.9.1 Insulation of refrigerant pipe
• The standard pipe length is 7.5m (25ft) in North America.
• Refrigerant may only be charged after performed the vacuum drying process.
• Always use gloves and glasses to protect your hands and eyes during the charge work.
• Use electronic scale or fluid infusion apparatus to weight refrigerant to be recharged. Be sure to avoid extra
refrigerant charged, it may cause liquid hammer of the compressor or protections.
• Use supplementing flexible pipe to connect refrigerant cylinder, pressure gauge and outdoor unit. And the
refrigerant should be charged in liquid state. Before recharging, the air in the flexible pipe and manifold
gauge should be exhausted.
• After finished refrigerant recharge process, check whether there is refrigerant leakage at the connection joint
part.(Using gas leakage detector or soap water to detect).