Daikin VRV 5-S RXYSA4A7V1B, Инструкция по установке и эксплуатации

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14 Piping installation
Installation and operation manual
27
RXYSA4~6A7V/Y1B
VRV 5-S system air conditioner
4P600329-1E – 2023.02
NOTICE
When brazing: First braze the liquid side piping, then the
gas side piping. Enter the filler rod from the front of the unit
and the brazing torch from the right side to braze with the
flame pointing outside. Avoid heating the compressor
sound insulation and other piping.
Wrap both stop valves in a wet cloth in order to protect the
valve internals from overheating.
a b c
a b f g
c d e
A
A
a Filler rod
b Fire resistant plate
c Torch
d Flame
e Compressor sound insulation
f Liquid side piping
g Gas side piping
4 Connect the field piping to the accessory pipes using the
accessory bend pipes (brazing). Mind the orientation of the
bends.
NOTICE
Always protect the surrounding surfaces (e.g. wiring,
insulation foam, …) from heat when brazing.
NOTICE
Make sure to open the stop valves after installing the
refrigerant piping and performing vacuum drying. Running
the system with the stop valves closed may break the
compressor.
14.2.3 To connect the refrigerant branching kit
For installation of the refrigerant branching kit, refer to the installation
manual delivered with the kit.
▪ Mount the refnet joint so that it branches either horizontally or
vertically.
▪ Mount the refnet header so that it branches horizontally.
A
B
±
3
0°
a
b
c
d
a
a Horizontal surface
b Refnet joint mounted vertically
c Refnet joint mounted horizontally
d Header
14.3 Checking the refrigerant piping
14.3.1 Checking refrigerant piping: Setup
p< p>
C
b c e
a
g
f
d
A B
R32 N
2
a Pressure reducing valve
b Nitrogen
c Weighing scales
d Refrigerant R32 tank (siphon system)
e Vacuum pump
f Liquid line stop valve
g Gas line stop valve
A Valve A
B Valve B
C Valve C
Valve Status
Valve A Open
Valve B Open
Valve C Open
Liquid line stop valve Close
Gas line stop valve Close
NOTICE
Indoor units should also be leak and vacuum tested. Keep
any possible (field supplied) field piping valves open as
well.
14.3.2 To perform a leak test
Vacuum leak test
1 Evacuate the system from the liquid and gas piping to a gauge
pressure of –⁠100.7 kPa (–⁠1.007 bar) for more than 2 hours.
2 Once reached, turn off the vacuum pump and check that the
pressure does not rise for at least 1 minute.
3 Should the pressure rise, the system may either contain
moisture (see vacuum drying below) or have leaks.
Pressure leak test
1 Break the vacuum by pressurising with nitrogen gas to a
minimum gauge pressure of 0.2 MPa (2 bar). Never set the
gauge pressure higher than the maximum working pressure of
the unit, i.e. 3.52 MPa (35.2 bar).
2 Test for leaks by applying a bubble test solution to all piping
connections.
3 Discharge all nitrogen gas.