GMV5 D.C INVERTER MULTI VRF SERVICE MANUAL
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6.3 INSULATION SYSTEM
6.3.1 Insulation for the Refrigerant Pipe System
6.3.1.1 Insulation Materials
Use closed-cell foam insulation materials with flame retardant grade of B1.
The heat conductivity is not greater than 0.035 w/(m·k) when the average temperature is 0°C.
6.3.1.2 Thickness of the Insulation Layer
External Diameter of the Pipe
Thickness of the Insulation Layer
Usesunblock, anti-weathering, and non-cracking insulation materials for outdoor pipes.
6.3.1.3 Procedure of Insulation
(1) Select insulation materials based on design requirements.
(2) Wear the insulation sleeve before connecting refrigerant pipes. Users cannot cut the insulation
material apart and then wrap up with ties after connecting the pipes by welding.
(3) Specifications of the insulation sleeve must match with that of the refrigerant pipes.
(4) Reserve a distance of about 200 mm(7.87inch) near the welding point to protect the insulation
sleeve during welding. After performing the air-tightness test, perform insulation to the welding point
separately to ensure continuity of the insulation sleeve.
(5) The insulation layer cannot crack during construction. Bond the insulation material joints with
special glue and then wrap them with electrical adhesive tape. The width of the adhesive tape must be
50 mm (1.97inch) or more to ensure secure connection.
(6) Use glue to bond the insulation material at the water outlet to the unit to prevent dewing.
(7) Wrap joints of indoor/outdoor units with insulation materials. There must be no gap between the
joint and the wall of the indoor/outdoor unit, as shown in the following figure.
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