Daikin FCA125AV16, Installation And Operational Manual

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Cl
REFRIGERANT PIPING WORK 5/5)
)
(PRECAUTIONS WHEN BRAZING THE REFRIGERANT PIPINGS)
<Do not reuse joint which have been
.
. used once already>
• When brazing the refrigerant piping, carry out brazing work (NOTE 2) after substituting nitrogen for air
(flow nitrogen into the piping and substitute nitrogen for air (NOTE 1) (see the drawing below)).
NOTES
1.The proper pressure for having nitrogen flow through the piping is approximately 0.02MPa, a pressure that makes one
feel like breeze and can be obtained through a pressure reducing valve.
2.Do not use flux when brazing refrigerant piping. Use phosphor
copper brazing filler metal (BCuP-2:JIS Z 3264/B-Cu93P-710/795:IS0 3677)
that does not require flux. (If chlorinated flux is used,
Refrigerant piping
the piping will be corroded and, in addition if fluorine
is contained, the refrigerant oil will be deteriorated
and the refrigerant circuit will be affected badly.)
(S)
Do not use anti-oxidants when brazing the piping joints.
Prohibited (Residue can clog pipes and break equipment.)
a
AIRTIGHTNESS TEST AND AIR-PURGE
(AIRTIGHTNESS TEST )
• Perform a refrigerant leakage check using nitrogen gas (airtightness test)
with the outdoor unit stop valve close, to make sure there are no leakage.
• For the airtightness test, raise the pressure to the
sto valve
)
I OUTDOOR UNIT I
Stop valve
design pressure in the high pressure section (4. 17 MPa) ,--- - - -�--- - -
+-s::;�-�
For the airtightness test, the unit passes the test if
I
'
,
I INDOOR UNIT I
t
f
he pressure in
f
the high pressure section does not drop
I
P
g
r
a
es
u
s
g
u
e
rel
�-=-�, l ______ �
or 24 hours a ter increasing to the design pressure.
'
L ______ -�
A t. · · d · th d
' Nitrogen
I
correc I0n Is require since e pressure ecreases
I _______
_J
vacuum pump
approx. 0.01 Mpa when the ambient
temperature of 1
0
c decreases.
(CHECKING LEAKAGE)
• If the pressure drop is confirmed, perform the airtightness test again after checking and modifying the leakage points.
(AIR-PURGE)
• Evacuate by the vacuum pump for more than 2 hours until the internal pressure decreases below -0.1 MP.
After that, leave it with -0.1 MPa or less for more than one hour and confirm that the value of vacuum gauges does not increase.
• If the value of vacuum gauge increases, there is moisture inside the refrigerant piping or there are leakage points.
Perform evacuation again after checking and improving the leakage points.
NOTE
• After doing an air-purge with a vacuum pump, the refrigerant pressure may not rise even if the stop valves are opened.
This is because the refrigerant piping path is closed off by the outdoor unit electronic expansion valve, etc.
There are no problems if the outdoor unit is running .
• CHARGING THE REFRIGERANT (1/2)
) ( Be sure to use R32 as refrigerant. )
,,.-
(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 the piping length exceeds that s hown in the left table or
charging is not required
recharging needs to be performed, charge as des cribed 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
Length of piping exceeding the length for which additional charging
additional charging
is not required, R32 additional amount (kg)
type
piping size is not required
30m or less 40m or less 50m or less
�
RZCA 125AV16,
09.5mm 30m
0.25
0.50
RZCA 140AV16
(Note) If the length of the refrigerant piping is within the range shown by t222: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.
_L_iquid_
Piping length, R32 complete additional amount (kg)
piping size
10m or less 20m or less 30m or less
40m or less
50m or less
Outdoor units
type
09.5mm
2.90 2.90
2.90
3.15 3.40
-----
RZCA 125AV16
RZCA
140AV16
42