GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
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2.7 After pipes are connected, perform a test with some water and another test with full water in the pipe to
check whether drainage is smooth and whether water leakage exists in the pipe system.
2.8 Equip a steel casing for all pipes which are led through the wall or floor. Pipe bonding joints cannot
be placed inside the sleeve. The steel casing must be parallel with the bottom of the floor or wall. There
must be a height drop of 20 mm from the ground when the pipe is lead through the floor. The sleeve
cannot affect the inclination degree of the pipe. Fill the gap between the pipe and the sleeve with flexible
and non-flammable materials. The sleeve cannot be used as a support point of the pipe.
2.9 Bond the insulation material joints with special glue and then wrap them with plastic adhesive tape.
The width of the adhesive tape must be 5 cm or more to prevent dewing.
3. Other Requirements
3.1 Ensure an inclination degree of more than 1% when connecting the drain pipe to the IDU.
Inclination degree
of more than 1/100
Correct connection Incorrect connection
3.2 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.
3.3 When connecting the drain pipe branches to the main pipe, lead through from the above part of the
main pipe.
3.4 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.
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