Daikin LRMEQ3BY1, Installation And Operation Manual

5 Installation

Installation and operation manual

13

4BY1
Air-cooled refrigeration condensing unit
4P495373-1 – 2017.07

c

c

b

a

4× Ø6 mm

4

Do the following:

▪ Connect the liquid pipe (a) to the liquid stop valve.
▪ Connect the gas pipe (b) to the gas stop valve.

a

b

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 b

c

a

b f

g

c

d

e

A

A

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

e1 e

c

d

f

Possibility 2: To the side

c

d e1 e f

Possibility 3: Downwards

c

e1
f

e

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 page 14

.