Midea MVi-224WV2RN1 - Refrigerant Piping Installation

V6-i VRF 50Hz
88
Midea
V6-i Series Engineering Data Book
4 Refrigerant Piping Installation
4.1 Procedure and Principles
4.1.1 Installation procedure
4.1.2 Three principles for refrigerant piping
Notes:
1. See Part 3, 4.2.1 “Pipe delivery, storage and sealing”.
2. See Part 3, 4.5 “Brazing”.
3. See Part 3, 4.7 “Pipe Flushing”.
4. See Part 3, 4.9 “Vacuum Drying”.
5. See Part 3, 4.3 “Manipulating Copper Piping”.
6. See Part 3, 4.8 “Gastightness Test”.
Installation of the refrigerant piping system should proceed in the following order:
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 unit have been connected
but before the indoor units are connected.
Notes for installers

Vacuum drying
Joint
insulation
Pipe
insulation
Pipe brazing
and installation
Pipe
flushing
Gastightness
test
CLEAN
DRY
Reasons
Particles such as oxide produced
during brazing and/or building dust
can lead to compressor malfunction
Moisture can lead to ice formation or
oxidization of internal components
leading to abnormal operation or
compressor damage
Measures
 Seal piping during storage
1
 Flow nitrogen during brazing
2
 Pipe flushing
3
 Pipe flushing
3
 Vacuum drying
4
SEALED
Imperfect seals can lead to refrigerant
leakage
 Pipe manipulation
5
and brazing
2
techniques
 Gas tightness test
6