Checking The Refrigerant Piping; About Checking The Refrigerant Piping - Daikin LRMEQ3BY1 Installation And Operation Manual

a b
4× Ø6 mm
c c
4 Do the following:
▪ Connect the liquid pipe (a) to the liquid stop valve.
▪ Connect the gas pipe (b) to the gas stop valve.
b
a
NOTICE
When brazing: First braze the liquid side piping, then the
gas side piping. Enter the electrode from the front of the
unit and the welding torch from the right side to braze with
the flames facing outside and avoid the compressor sound
insulation and other piping.
A
a b
a Electrode
b Burning-resistant plate
c Welding torch
d Flames
e Compressor sound insulation
f Liquid side piping
g Gas side piping
▪ Connect the gas piping accessories (c, d, e), and cut them to
the required length (e1). This is necessary because the size
of the gas stop valve is Ø15.9 while the piping between
outdoor unit and first refrigerant branch kit is Ø19.1.
Possibility 1: To the front
c
f e1 e d
LRMEQ3+4BY1
Air-cooled refrigeration condensing unit
4P495373-1 – 2017.07
A
e d c
a b f g
c
Possibility 2: To the side
c
d e1 e f
Possibility 3: Downwards
c Gas piping accessory 1
d Gas piping accessory 2
e, e1 Gas piping accessory 3 (cut it to the required length)
f Field supply
5 Reattach the service cover and the piping intake plate.
6 Seal all gaps (example: a) to prevent snow and small animals
from entering the system.
a
WARNING
Provide adequate measures to prevent that the unit can be
used as a shelter by small animals. Small animals that
make contact with electrical parts can cause malfunctions,
smoke or fire.
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.
5.4

Checking the refrigerant piping

5.4.1

About checking the refrigerant piping

Checking the refrigerant piping involves:
▪ Checking for any leakages in the refrigerant piping.
▪ Performing vacuum drying to remove all moisture, air or nitrogen
in the refrigerant piping.
If there is a possibility of moisture being present in the refrigerant
piping (for example, water may have entered the piping), first carry
out the vacuum drying procedure below until all moisture has been
removed.
All piping inside the unit has been factory tested for leaks.
Only field installed refrigerant piping needs to be checked.
Therefore, make sure that all the outdoor unit stop valves are firmly
closed before performing leak test or vacuum drying.
NOTICE
Make sure that all (field supplied) field piping valves are
OPEN (not outdoor unit stop valves!) before you start leak
test and vacuuming.
For more information on the state of the valves, refer to
"5.4.3 Checking refrigerant piping: Setup" on
5 Installation
c
e
e1
f
page 14.
Installation and operation manual
13