Refrigerant Line Connections; Leak Testing (Nitrogen Or Nitrogen-Traced); System Start-Up Procedure - Daikin DZ18VC Series Installation Instructions Manual

Refrigerant Line Connections

IMPORTANT
To avoid overheating the service valve, EEV, 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
recommended 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. "Sweep" the refrigerant line with nitrogen or inert gas
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
preventative.
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.

Leak Testing (Nitrogen or Nitrogen-Traced)

T
O AVOID THE RISK OF FIRE OR EXPLOSION
PRESSURE AIR OR FLAMMABLE GASES FOR LEAK TESTING OF A
.
REFRIGERATION SYSTEM
WARNING
,
NEVER USE OXYGEN
T
O AVOID POSSIBLE EXPLOSION
CYLINDER MUST INCLUDE A PRESSURE REGULATOR AND A PRESSURE
. T
RELIEF VALVE
NO MORE THAN
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 refrigerant then use nitrogen to finish charging
the system to working pressure then apply the detector to
suspect areas. If leaks are found, repair them. After repair,
repeat the pressure test. If no leaks exist, proceed to System
Start-up Procedure.

System Start-up Procedure

GENERAL NOTES:
Adequate refrigerant charge for the matching indoor coil and
15 feet of line set is supplied with the heat pump unit. If liquid
line set exceeds 15 feet in length, refrigerant should be added
at 0.6 ounces per foot of liquid line.
NOTICE
V EPA
IOLATION OF
.
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
,
DAMAGE PERSONAL INJURY OR DEATH
O
PERATING THE COMPRESSOR WITH THE GAS VALVE CLOSED WILL
CAUSE SERIOUS COMPRESSOR DAMAGE
COVERED BY OUR WARRANTIES
U
SE REFRIGERANT CERTIFIED TO
MAY CAUSE COMPRESSOR DAMAGE
. M
WARRANTY
REFRIGERANT TO MEET
,
HIGH
5
WARNING
,
THE LINE FROM THE NITROGEN
HE PRESSURE RELIEF VALVE MUST BE SET TO OPEN AT
150 .
PSIG
REGULATIONS MAY RESULT IN FINES OR OTHER
.
WARNING
.
CAUTION
-
SUCH DAMAGE IS NOT
.
CAUTION
AHRI
STANDARDS
,
AND IS NOT COVERED UNDER
OST PORTABLE MACHINES CANNOT CLEAN USED
AHRI .
STANDARDS
.
.
. U
SED REFRIGERANT
THE