Gree Ultra Heat GMV-VQ72W/A-F, Service Manual, Page: 65 / 207

Ultra Heat GMV VRF Technical Service Manual_Heat Recovery Serial INSTALLATION
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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.
3.2 Insulation for the Condensate Water Pipe System
(1) Thickness of the Insulation Layer
Thickness of the insulation layer for the condensate water pipe must be greater than 10 mm
(0.39inch).
(2) Bond the insulation material joints with special glue and then wrap them with plastic adhesive.
The width of the adhesive must be greater than 50mm (1.97inch) to prevent dewing.
(3) Insulation is not required for the outdoor part of condensate water pipes.
3.3 Insulation for Air Ducts
(1) Insulation for air duct components and devices must be performed after the air leakage test is
performed or after quality check.
(2) Use centrifugal glass wool or rubber and plastic materials for insulation or use novel insulation
air ducts.
(3) The insulation layer should be flat and tight without any crack or gap.
(4) Thickness of the Insulation Layer
For the air supply and return air pipe laid in a room without an air conditioner, thickness of the
rubber and plastic insulation layer is 35 mm (1.38inch). For the air supply and return air pipe laid in an air
conditioning room, thickness of the rubber and plastic insulation layer is 20 mm (0.79inch).
(5) Supports, hangers, and brackets of the air duct must be installed outside the insulation layer. A
chock must be provided between the support, hanger, or brackets and the air duct.