Installation Of Refrigerant Pipes; Operation Sequence; Construction Of Support, Hanger, And Bracket; Shaping And Fixing Of Pipes - Gree GMV-S120WL/A-S Service Manual

1）Put the flaring nuts into the copper pipe;
2）Put the pipe into the root of the pipe expander and the arrange flaring;
（1）Before pipe flaring, apply appropriate amount of lubricant on the surface of the opening
to ensure smooth pass of flaring nuts and avoid pipe distortion;
（2）The concentricity must be ensured after pipe flaring. The sealing face must be intact
without any burr, crack, or wrinkle;
（3）Use a slicker to remove the little burs in the pipe port.

9.5.1.2 Installation of refrigerant pipes

9.5.1.2.1Operation sequence

The sequence for installing the refrigerant pipe is as follows:
Preparing and installing the support, hanger, and bracket –Piping according to the drawing –
Cleaning the pipe – Processing the pipe – Adding an insulation sleeve – Connecting the
pipe–Fixing the pipe – Blowing contaminants in the pipe system –Performing a air-tightness test –
Performing insulation.

9.5.1.2.2 Construction of support, hanger, and bracket

1）Construction of supports, hangers, and brackets for pipes: These parts must be fixed
securely in reasonable type and style without any tilt. The surface is clean without any dirt. The
parts embedded into the wall or floor cannot be painted or coated and must be free from grease
stains;
2）Construction of fixing bolts for devices: Ensure sufficient rigidity for the devices. Take
anticorrosive measures for exposed part of built-in fittings. If the foundation must be waterproof,
takes waterproof measures;
3）Construction of steel casings: Equip a steel casing for all pipes which are led through the
wall or floor. Pipe welding joints cannot be placed inside the sleeve. The steel casing must be
parallel with the bottom of the wall or floor but be 20 mm or more above the bottom. The diameter
of the steel casing must be determined based on the thickness of the insulation layer and the
inclination degree of the condensate water 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.
4）Operation sequence
Drawing of
built-in metal
fittings
If possible, make ink lines on the ground and project them to the top of the building.
5）Installing built-in metal fittings
Select built-in metal fittings in accordance with local regulations.
6）Installing expansion bolts
Use expansion bolts when built-in metal fittings are unavailable due to design change.
7）Installing expansion bolts
●If the foot pedal is 2m or more from the ground, there must be three points of support.
The foot pedal must be tightened securely with the ladder.
●Do not perform operations on the top of the ladder.

9.5.1.2.3 Shaping and fixing of pipes

When installing refrigerant pipes, ensure that the directions and branches are correct with
minimum length. Use minimum number of braze welding junctions and elbows. Alignment and
GMV5 Home DC Inverter Multi VRF Units
Making ink
lines
153
Installing built-
in metal fittings