Installation
Page 133
8. Additional Refrigerant Charge
• 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 be-
tween indoor and outdoor unit. Refer the following
formula to calculate the charge volume.
Diameter of liquid pipe (mm)
Formula
6.35
V=15g/m×((Total pipe
length - pre-charge
pipe lengthxN))
9.52
V=30g/m×((Total pipe
length - pre-charge
pipe lengthxN))
The pre-charge pipe length is 7.5m.
Note:
• 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 ham-
mer of the compressor or protections.
• Use supplementing flexible pipe to connect refriger-
ant 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 connec-
tion joint part.(Using gas leakage detector or soap
water to detect).
9. Engineering of Insulation
9.1 Insulation of refrigerant pipe
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 50-
100°C) 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 120°C
• 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.
4. Installation highlights of insulation construction
• Gas pipe and liquid pipe shall be insulated sepa-
rately, if the gas pipe and liquid pipe were insulated
together; it will decrease the performance of air
conditioner.
• The insulation material at the joint pipe shall be
5~10cm longer than the gap of the insulation mate-
rial.
• The insulation material at the joint pipe shall be
inserted into the gap of the insulation material.
• The insulation material at the joint pipe shall be
banded to the gap pipe and liquid pipe tightly.
• The linking part should be use glue to paste to-
gether
• Be sure not bind the insulation material over-tight, it
may extrude out the air in the material to cause bad
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