Gree GMV5E Series Service Manual page 55

GREE
6.1.2.5 Flaring
Another mode of pipe connection is flare opening connection, which requires pipe flaring before
connection. 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. (The lubricant must meet the refrigerant
system's requirements.) The concentricity must be ensured after pipe flaring. The sealing face must be
intact without any burr, crack, or wrinkle.
Requirements on pipe flaring are as follows:
(1) End faces of the copper pipe are smooth.
(2) Burrs and turnups inside the pipe opening must be cleared.
(3) Install flaring nuts in the pipe before pipe flaring.
(4) The flared opening must be concentric with the main pipe. No eccentricity is allowed.
(5) Put the pipe into the root of the pipe expander.
(6) Longitudinal cracks cannot be generated.
6.1.3 Installation of Refrigerant Pipes
(1) Operation 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
(2) Construction of Built-in Metal Fittings
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
If possible, make ink lines on the ground and project them to the top of the building.
5) Installing Built-in Metal Fittings
GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
Drawing of built- Making
in metal fittings ink lines
51
Installing built-in
metal fittings