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7
Refrigerant Line Connections
IMPORTANT
To avoid overheating the service valve, TXV, sensor 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. Purge with nitrogen at 2 to 3 psig during brazing
to prevent the formation of copper-oxide inside
the refrigerant lines. The FVC 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
,
NEVER
USE
OXYGEN
,
HIGH
PRESSURE
AIR
OR
FLAMMABLE
GASES
FOR
LEAK
TESTING
OF
A
REFRIGERATION
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
.
WARNING
To locate leaks, pressure test the system using dry
nitrogen or leak detector fluid per the manufacturer’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 condensing
unit. If liquid line set exceeds 15 feet in length, refrigerant
should be added at 0.6 ounces per foot of liquid line.
V
IOLATION
OF
EPA
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
.
NOTICE
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
.
WARNING
CAUTION
Operating the compressor with the suction valve closed
will cause serious compressor damage - such damage is not
covered by our warranties.
Содержание VXC20 Series
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