Refrigerant Piping Installation - Midea V6R Series Manual

V6R VRF 50/60Hz

5 Refrigerant Piping Installation

5.1 Procedure and Principles
5.1.1 Installation procedure
Notes for installers
Installation of the refrigerant piping system should proceed in the following order:
Pipe Pipe brazing
insulation and installation
Note: Pipe flushing should be performed once the brazed connections have been completed with the exception of the
final connections to the indoor units. That is, flushing should be performed once the outdoor units have been
connected but before the indoor units are connected.
5.1.2 Three principles for refrigerant piping
CLEAN
can lead to compressor malfunction
Moisture can lead to ice formation or
DRY
Imperfect seals can lead to refrigerant
SEALED
Notes:
1. See Part 3, 5.2.1 "Pipe delivery, storage and sealing".
2. See Part 3, 5.5 "Brazing".
3. See Part 3, 5.8 "Pipe Flushing".
4. See Part 3, 5.10 "Vacuum Drying".
5. See Part 3, 5.3 "Manipulating Copper Piping".
6. See Part 3, 5.9 "Gastightness Test".
150

Pipe
flushing
Reasons
Particles such as oxide produced
during brazing and/or building dust
oxidization of internal components
leading to abnormal operation or
compressor damage
leakage
Gastightness Joint
test insulation
Measures
 Seal piping during storage
 Flow nitrogen during brazing
 Pipe flushing
3
 Pipe flushing
3
 Vacuum drying
 Pipe
manipulation
techniques
 Gastightness test
Vacuum drying
1
2
4
5 2
and brazing
6