Just Better DV-22N Digital Micron Gauge User Manual

Page 2

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When charging,
close this valve.
Most micron
gauges will not
withstand high

Hoses to Manifold

Suggested Application
When Charging Using
Superheat Method:

With Valve "A" closed,
remove Micron Gauge
and attach Superheat
Gauge. Bleed at
Quick Coupler before


Valve position pictured for Pressure Rise Test.
Valve "A" to micron gauge is open and valves
from manifold to "B" and "C" are "closed".



Before making connection as pictured, close all Ball
Valves before hookup.

NOTE: If micron gauge has 1/4"

male flare, use D10244 O-ring Swivel Coupler included.

Leak-Proof Test Unit

Deep vacuum has it own unique properties which
requires leak-proof design in all the components includ-
ing couplers and hoses. DV-29 unit with flexible metal
hose and O-ring seal couplers is absolutely vacuum tight.

Pulling a Vacuum

Open all valves and pull a vacuum. When the sensor
reads between 300 and 400 microns and only if com-
pressor is in the vacuum, close valves to the high and
low side of the system, leaving the valve closest to the
micron gauge open. You now have the micron gauge
within the system to check for pressure rise.

Pressure Rise Test

When the sensor reads between 300 and 400 mi-

DV-29 Method. Blank-off the high and low side ball

valves attached to the system.

General Hookup Method. This includes using copper

tubing or metal hose to the high and low side. Close
blank-off valve on the pump. This will isolate the gauge
from the pump.

Wait for at least 5 to a maximum of 20 minutes to

allow system pressure to equalize. The reading you see at
the end of this test will be very close to what you actually
have in the system. A rapid rise during this test to atmo-
spheric pressure indicates a leak, while a slower rise to
around 1500 microns indicates moisture is present.



Printed in USA

© 2007 J/B Industries Inc.