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. REFRIGERANT PIPING WORK (5/5)
. AIRTIGHTNESS TEST AND AIR-PURGE
- CHARGING THE REFRIGERANT (1/2)
.
(PRECAUTIONS WHEN BRAZING THE REFRIGERANT PIPINGS)
• When brazing
he refrigeran
(flow ni
rogen in
o
he piping and subs
t
t
t
t
1.The proper pressure for having ni
NOTES
feel like breeze and can be ob
2.Do no
use flux when brazing refrigeran
copper brazing filler me
t
ha
does no
require flux. (If chlorina
he piping will be corroded and, in addi
t
t
t
is con
ained,
he refrigeran
t
and
he refrigeran
circui
t
t
(S)
t
t
Do not use anti-oxidants when brazing the piping joints.
(Residue can clog pipes and break equipment.)
I
Prohibited
• Perform a refrigeran
leakage check using ni
(AIRTIGHTNESS TEST )
wi
h
he ou
door uni
s
t
• For
he airtigh
ness
es
t
t
t
t
t
design pressure in
he high pressure sec
t
t
t
For
he airtigh
ness
es
t
he pressure in
he high pressure sec
t
t
t
for 24 hours af
er increasing
t
t
A correc
ion is required since
t
approx. 0.01 Mpa when
t
empera
ure of 1
c decreases.
• If
he pressure drop is confirmed, perform
°
t
t
t
• Evacua
e by
he vacuum pump for more
(AIR-PURGE)
Af
er
ha
, leave i
wi
h -0.1 MPa or less for more
t
t
• If
he value of vacuum gauge increases,
t
t
t
t
t
Perform evacua
ion again af
t
t
• Af
er doing an air-purge wi
NOTE
This is because
he refrigeran
t
There are no problems if
t
/
(7-1 PRECAUTIONS FOR ADDING REFRIGERANT
This unit does not require charging. So if the piping length is within the lengths shown in the
table below, no additional refrigerant needs to be charged.
Liquid piping size
09.5mm x t 0.8mm
( 7.2 ADDING REFRIGERANT
From the table below, select a refrigerant amount that is suitable for a piping length exceeding the length for
which charging is actually needed. Then add the refrigerant from the service port of the liquid side stop valve.
Outdoor units
type
RZA125AV16
RZA24AVMK
(Note) If the length of the refrigerant piping is within the range shown by 1222:J, additional charge is not required.
RZA140AV16
RZA30AVMK
(7.3 COMPLETE RECHARGING OF THE REFRIGERANT )
Recharge the amount of refrigerant selected from the table below.
Outdoor units
type
RZA125AV16
RZA140AV16
'---
piping, carry ou
brazing work (NOTE 2) af
i
u
e ni
rogen for air (NOTE 1) (see
t
t
t
t
t
t
rogen flow
hrough
ained
hrough a pressure reducing valve.
t
t
piping. Use phosphor
t
t
al (BCuP-2:JIS Z 3264/B-Cu93P-710/795:IS0 3677)
t
ed flux is used,
t
ion if fluorine
t
oil will be de
eriora
ed
t
will be affec
ed badly.)
t
t
t
t
t
rogen gas (air
op valve close,
o make sure
t
, raise
he pressure
o
he
t
ion (4.17 MPa)
t
t
t
t
,
he uni
passes
he
es
if
t
ion does no
t
t
t
t
t
t
o
he design pressure.
t
t
he pressure decreases
t
t
he ambien
t
t
t
he airtigh
t
han 2 hours un
han one hour and confirm
t
here is mois
t
er checking and improving
t
t
h a vacuum pump,
he refrigeran
piping pa
h is closed off by
t
t
he ou
door uni
is running.
t
t
t
t
t
Length for which additional
charging is not required
30m
Length for which
Liquid
addi
onal charg
piping size
is not requ
ti
09.5mm
_L_ i quid_
piping size
09.5mm
09.5mm
)
.
er subs
he drawing below)).
t
t
he piping is approxima
t
Refrigerant piping
]
igh
ness
es
)
here are no leakage.
t
t
t
t
_______ _
'
t
essur
drop
auge
'
og
L
- - - - - - -
'i
Nitr
(CHECKI
G LEAKAGE)
ness
es
again af
er checking and modifying
N
t
t
t
t
il
he in
ernal pressure decreases below -0.1 MP.
ha
t
t
t
ure inside
he refrigeran
t
he leakage poin
s.
t
t
t
t
t
pressure may no
he ou
door uni
elec
t
t
t
t
t
)<
)
In case where
he p
p
ng leng
recharging needs to be performed, charge as descr
t
i
i
Be sure to write down the additional amount of refrigerant charged or the
entire amount recharged on the indications label to the back side of the
front plate, after the unit installed.
)
Leng
h of p
p
ng exceed
is no
ng
t
i
i
red
30m or less
i
30m
i
�
( Wh en recharging for compressor replacement, etc.)
Piping length, R32 complete additional amount (kg}
20m or less
10m or less
2.90
2.90
2.90
2.90
31
<Do no
reuse join
which have been
used once already>
t
t
i
u
ing ni
rogen for air
t
t
t
t
ely 0.02MPa, a pressure
ha
t
t
s
o valve
t
)
I OUTDOOR U
IT I
Stop valve
N
���������"E2::
I
'
Vacuum pump
he leakage poin
t
he value of vacuum gauges does no
piping or
here are leakage poin
t t
t
rise even if
he stop valves are opened.
ronic expansion valve, e
c.
t
t
t
Be sure
o useR32 as refrigeran
t
h exceeds
hat shown
t
t
i
ng
he length for wh
requ
red, R32 add
onal amoun
i
t
i
40m or less
t
i
iti
0.25
40m or less
30m or less
2.90
3.15
2.90
3.15
makes one
t
I
DOOR U
IT
I
I
N
N
s.
t
increase.
s.
t
t
. )
t
'
n
he lef
able o
bed below.
i
t
t t
r
ch add
onal charg
ng
(kg)
iti
i
50m or less
t
0.50
50m or less
3.40
3.40
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