R410A DC Inverter Multi-split Technical Manual
Installation
63
GD Chigo Heating & Ventilation Equipment Co., Ltd.
6. Insulation Work
6.1 Insulation material and thickness
1) Insulation material
Insulation material should adopt the material which is able to endure the pipe’s temperature: no less than
70°C in the high-pressure side, no less than 120°C in the low-pressure side(For the cooling type machine,
no requirements at the low-pressure side.)
Example: Heat pump type----Heat-resistant Polyethylene foam (withstand above 120°C)
Cooling only type---- Polyethylene foam (withstand above 100°C)
2) Thickness choice for insulation material
Insulation material thickness is as follows:
Pipe diameter (mm)
Adiabatic material thickness
Refrigerant pipe
Ф6.4—Ф25.4
10mm
Ф28.6—Ф38.1
15mm
Drainage pipe
Inner diameter
Ф20—Ф32
6mm
6.2 Refrigerant pipe insulation
1) Work Procedure
Before laying the pipes, the non-jointing parts and non-connection parts should be heat insulated.
When the gas proof test is eligible, the jointing area, expanding area and the flange area should be heat
insulated.
2) Insulation for non-jointing parts and non-connection parts.
wrong
Right
Gas pipe and liquid pipe should not be
put together to insulate
Insulate the gas pipe (cooling only)
Insulate the gas pipe and liquid pipe
For construction convenience, before laying pipes, use insulation material to insulate the pipes to be deal with,
at the same time, at two ends of the pipe, remain some length not to be insulated, in order to be welded and
check the leakage after laying the pipes.
3) Insulate for the jointing area, expanding area and the flange area
Insulate for the jointing area, expanding area and the flange area should be done after checking leakage
of the pipes
