8
r
efrIgerant
l
Ine
c
onnectIonS
iMPortAnt
To avoid overheating the service valve, sensors, or filter
drier while brazing, wrap the component with a wet rag,
or use a thermal heat trap compound. If using a wet rag
care should be taken to not get water/moisture inside the
tubing as it’s very important to keep moisture out of the
system. Be sure to follow the manufacturer’s instruction
when using the heat trap compound.
Note: Remove Schrader valves from service valves before
brazing tubes to the valves. After brazing is brought up,
use a brazing alloy of 2% minimum silver content. Do not
use flux.
Torch heat required to braze tubes of various sizes is
proportional to the size of the tube. Tubes of smaller size
require less heat to bring the tube to brazing temperature
before adding brazing alloy. Applying too much heat to any
tube can melt the tube. Service personnel must use the
appropriate heat level for the size of the tube being brazed.
note:
The use of a heat shield when brazing is recom-
mended to avoid burning the serial plate or the finish on
the unit.
1. The ends of the refrigerant lines must be cut square,
deburred, cleaned, and be round and free from nicks
or dents. Any other condition increases the chance of
a refrigerant leak.
2. Purge with nitrogen at 2 to 3 psig during brazing
to prevent the formation of copper-oxide inside
the refrigerant lines. The PVE oils used in R-410A
applications will clean any copper-oxide present
from the inside of the refrigerant lines and spread it
throughout the system. This may cause a blockage or
failure of the metering device.
3. During and after brazing, quench the joints with water
or a wet cloth to prevent overheating of the service
valve.
4. A bi-flow filter drier is shipped with the unit as a
separate component and must be brazed on by the
installer on-site. Ensure the bi-flow filter drier paint
finish is intact after brazing. If the paint of the steel
filter drier has been burned or chipped, repaint or treat
with a rust inhibitor.
The recommended location of the filter drier is before the
expansion device at the indoor unit.
note:
Be careful not to kink or dent refrigerant lines. Kinked
or dented lines will cause poor performance or compressor
damage.
Do NOT make final refrigerant line connection until plugs
are removed from refrigerant tubing.
Stop valve
Tighten Torque
Shaft (valve body)
Cap (valve cover)
Liquid Line
(3/8”)
5-7 N·m
Hex. wrench 4 mm
13.5-16.5 N·m
Suction Line
(7/8”)
19-21 N·m
Hex. wrench 8 mm
22.5-27.5 N·m
Service Port
Tighten Torque
Service Port
10.7 – 14.7 N·m
note:
Preventing foreign objects from entering.
•
Plug the pipe through-holes with accessory set or putty
(field supply) to cover all gaps.
•
Insects or small animals may enter inside of outdoor units
and cause damage to the electrical components.
Putty (field supply) or heat insulating
material (accessory)
l
eak
t
eStIng
(n
Itrogen
or
n
Itrogen
-t
raced
)
WArninG
t
o
avoId
the
rISk
of
fIre
or
exploSIon
,
never
uSe
oxygen
,
hIgh
preSSure
aIr
or
flammaBle
gaSeS
for
leak
teStIng
of
a
refrIg
-
eratIon
SyStem
.
WArninG
t
o
avoId
poSSIBle
exploSIon
,
the
lIne
from
the
nItrogen
cylInder
muSt
Include
a
preSSure
regulator
and
a
preSSure
relIef
valve
.
t
he
preSSure
relIef
valve
muSt
Be
Set
to
open
at
no
more
than
150
pSIg
.
To locate leaks, system pressure test use dry nitrogen or
leak detector fluid per Daikin’s recommendation. If you wish
to use a leak detector.
•
Charge the system to 10 psi using the appropriate refrig-
erant.
• Use nitrogen to finish charging the system to working
pressure.
•
Apply the detector to suspect areas.
If leaks are found, repair them. After repair, repeat the pres-
sure test. If no leaks exist, proceed to
System Start-up
Procedure.
