Gree Ultra Heat GMV-VQ72W/A-F, Service Manual, Page: 62 / 207

Ultra Heat GMV VRF Technical Service Manual_Heat Recovery Serial INSTALLATION
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2.3 Other Requirements
(1) Ensure an inclination degree of more than 1% when connecting the drain pipe to the IDU.
(2) When connecting the drain pipe to that of the IDU, fix the pipes with the bands provided upon
delivery instead of using the glue to facilitate further maintenance.
(3) When connecting the drain pipe branches to the main pipe, lead through from the above part of
the main pipe.
(4) If the air volume of the IDUs is high and outdoor air resorption may be caused by negative
suction pressure, provide a U-type drain trap at the water outlet side of each IDU, as shown in the
following figure.
Install drain trap connectors as shown in the following figure.
Install a drain trap connector for each unit.
The drain trap connector shall be installed in a way that facilitates trap cleaning.
(5) During condensate water pipe installation, ensure a distance above 500mm (19.7inch) between
the pipe and the electric box of the unit for maintenance. In a case when the space is not enough, the
final piping way must be determined by the technical personnel.
2.4 Requirements on Installation of Drain Pipes for Different Types of
IDUs