Gree Ultra Heat GMV-V72W/A-F, Service Manual, Page: 58 / 240

Ultra Heat GMV VRF Technical Service Manual INSTALLATION
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(2) Drain Pipe Installation for IDU
a. Use pipe clips instead of applying glue to connect the hoses provided upon delivery and plastic
pipes on the device. Connect the other end of the joint to the elbow. The height from the suction inlet of
the discharge pump is about 200mm (7.87 inch) to 500 mm (19.7 inch). Ensure a proper inclination
degree while connecting to the main drain pipe.
b. The lifting pipe for drainage must be provided as shown in the following figure.
c. The drain pump shall be fixed securely. Otherwise, abnormal noises will be generated.
2.5 Requirements on Independent Drainage for Each IDU
Requirements on independent drainage design for each IDU are as follows:
(1) There must be a proper inclination for the drain pipe.
(2) The drain pipe must be installed to facilitate drainage to the largest extent and be as short as
possible.
(3) If the water is discharged to the outdoor side, it cannot drop to the outdoor ground directly.
2.6 Requirements on Centralized Drainage for IDUs
(1) When there are multiple IDUs in the same building, centralized drainage is adopted.
(2) When a header pipe is used, the drain pipe of each IDU must be higher than the header pipe.
(3) The diameter of the header pipe must be determined on the number and capacity of IDUs.
(4) When installing pipe, start from the highest point of the pipe and follow the specified inclination to
smoothly discharge condensate water.
(5) Connect branches to the main pipe from the upper part or side instead of lower part of the main
pipe.
(6) Insulate all condensate water pipes, especially for joints at elbows.
3 INSULATION SYSTEM
3.1 Insulation for the Refrigerant Pipe System
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.