Gree GMV5 Series Service Manual page 60

d) The flared opening must be concentric with the main pipe. No eccentricity is allowed.
e) Put the pipe into the root of the pipe expander.
f) Longitudinal cracks cannot be generated.
3. Installation of Refrigerant Pipes
3.1 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
3.2 Construction of Built-in Metal Fittings
3.2.1 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.
3.2.2 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.
3.2.3 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.
3.2.4 Operation Sequence
If possible, make ink lines on the ground and project them to the top of the building.
3.2.5 Installing Built-in Metal Fittings
Select built-in metal fittings in accordance with local regulations.
3.2.6 Installing Expansion Bolts
Use expansion bolts when built-in metal fittings are unavailable due to design change.
3.2.7 Installing Expansion Bolts
If the foot pedal is 2 m 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.
3.3 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 insulation after
installation cannot affect the pipe location and elevation. There shall not be flat bending or corrugation on
the pipe after piping.
Use angle steel support, bracket, round steel hanger, U-type pipe clip, or flat steel to fix pipes
outside the insulation layer. It is better that the insulation materials be not compressed to ensure good
insulation.
The style and workmanship of supports, hangers, and brackets must follow the standard T616
HVAC Systems Design Handbook.
GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
Drawing of built-
in metal fittings
Making Installing built-in
ink lines metal fittings
57