Daikin FDMA125AV16, Installation Manual

Page: 32 / 60

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