Leak Testing (Nitrogen Or Nitrogen-Traced); R Efrigerant L Ine C Onnections; S Ystem S Tart - Up P Rocedure; T Raced ) - Daikin DX17VSS181AA Installation Instructions Manual

R l
eFRigeRant ine
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. 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. 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. 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.
C
onneCtions
l t (n
eak esting itRogen oR
t
o AvoId the rIsK of fIre or explosIon
pressure AIr or flAmmAble gAses for leAK testIng of A refrIg
.
erAtIon system
t
o AvoId possIble explosIon
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, pressure test the system using 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.
s s -
ystem taRt uP
GENERAL NOTES:
Adequate refrigerant charge for the matching indoor coil and
line set is supplied with the air conditioner. If liquid line set
exceeds factory charge length, refrigerant should be added
at 0.6 ounce (Liquid line diameter 3/8") or 0.23 ounce (Liquid
line diameter 1/4") of refrigerant perfoot of liquid line.
NOTICE
v epA
IolAtIon of regulAtIons mAy result In fInes or other
.
penAltIes
NOTICE
A
ll unIts should hAve A hIgh voltAge power supply ConneCted
2
hours prIor to stArtup
refrIgerAnt under pressure!
• d
o not overChArge system wIth refrIgerAnt
• d
o not operAte unIt In A vACuum or At negAtIve pressure
f
AIlure to follow proper proCedures mAy CAuse property dAm
,
Age personAl Injury or deAth
o
perAtIng the Compressor wIth the suCtIon vAlve Closed wIll
CAuse serIous Compressor dAmAge
.
by our wArrAntIes
8
n
itRogen
WARNING
,
never use oxygen
WARNING
,
the lIne from the nItrogen CylInder
P
RoCeduRe
.
WARNING
.
.
CAUTION
-
suCh dAmAge Is not Covered
-t )
RaCed
,
hIgh
-
.
.
-