R3250Hz Universal Outdoor Series Technical Manual
143
GD Chigo Heating & Ventilation Equipment Co., Ltd.
5 Insulation Work
5.1 Insulation material and thickness
5.1.1. Insulation material
Insulation material should adopt the material which is able to endure the pipe’s temperature: no
less than 70
℃
in the high-pressure side, no less than 120
℃
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
℃
)
Cooling only type----Polyethylene foam (withstand above 100
℃
)
5.1.2. Thickness choice for insulation material
Insulation material thickness is as follows:
Pipe diameter (mm)
Adiabatic material thickness
Refrigerant pipe
Φ6.4
—
Φ25.4
10mm
Φ28.6
—
Φ38.1
15mm
Drainage pipe
Inner diameter
Φ20
—
Φ32
6mm
5.2 Refrigerant pipe insulation
5.2.1. Work Procedure
①
Before laying the pipes, the non-jointing parts and non-connection parts should be heat
insulated.
②
When the gas proof test is eligible, the jointing area, expanding area and the flange area should be heat
insulated
5.2.2. 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
