REFCO VG-64 - Manual (Page 2)

CONNECTING THE
VG-64 TO THE
VACUUM SYSTEM
The VG-64 should be
connected to the
vacuum system at
the vacuum port.
The "Auxiliary Port"
is primarily for cleaning
And should normally be
closed with the supplied cap. It is possible to connect the VG-64 in-line, however
it may restrict flow and increase the evacuation time.
CLEANING THE VG-64 VACUUM SENSOR
It is recommended that the VG-64 sensor be cleaned periodically to
maintain unit accuracy. Oil and other contaminants reduce the
accuracy of the VG-64 unit. Follow the instructions below for
cleaning.
• Close the vacuum port with the supplied cap. Open the auxiliary
port.
• Use an eyedropper to pour approximately 2 teaspoons of
ordinary rubbing alcohol into the auxiliary port.
• Close the auxiliary port with the supplied cap. Both the vacuum
and auxiliary ports should now be closed.
• Shake the VG-64 unit for approximately 10 seconds. A slight
movement of the vacuum sensor in the case is normal and does
not affect the internal connection in any way.
• Open both the vacuum and the auxiliary ports. Empty the alcohol
and air dry the sensor.
• Close both the vacuum and the auxiliary ports with the supplied
caps when the VG-64 is not used. This prevents contamination of
the sensor.
CHECKING HVAC SYSTEMS FOR LEAKS
When checking a system for leaks use only copper tubing and a
vacuum proof valve. Generally standard hoses will not hold a
vacuum. If using the blank-off valve on the vacuum pump check it
for leaks periodically. At the beginning of the test the VG-64 reading
may increase due to a system equalization. The vacuum reading
should hold after a minimum of 5 minutes. If the reading continues
to increase it may indicate a leak in the system.
OPERATING CONTROLS
• Turning the vacuum gauge ON: Press and hold the ON
button for approximately 3 seconds, until the display
appears.
• Turning the vacuum gauge OFF: Press the OFF button. To
prolong battery life, when vacuum reading is above
12,000 Microns for approximately 10 minutes, the VG-
64 will automatically turn OFF.
• Changing the scale: Press the Scale button to change
the display to the next scale. The scale order is:
Microns, PSI, Inches of mercury (InHg), milliBars,
Pascals, Torr and milliTorr. The VG-64 will keep the scale
settings even if the power is turned OFF.
UNDERSTANDING THE DISPLAY
• When the vacuum reading is above 12,000 Microns
(1,600 Pascals), the first line of the display shows "Atm."
The second line displays a bar graph to indicate the
direction in which the vacuum is moving. When the bar
graph is moving from left to right, the pressure is
increasing. When the bar graph is moving from right to
left, the pressure is decreasing. The speed of the bar
graph indicates how fast the pressure is increasing or
decreasing. The bar graph indicator may be inaccurate
for a few seconds after the evacuation of the system has
begun.
• The bar graph disappears if the vacuum does not change
for approximately 10 seconds.
• When the vacuum reading is below 12,000 Microns
(1,600 Pascals), the vacuum in the selected units is
displayed.
VG-64