QBD COOLING SYSTEMS INC.
QBD.COM
27
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Always use QBD supplied OEM parts only. Use of non-OEM
parts will not only void the warranty but may also lead to a fire,
explosion, serious injury or death.
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Only trained and certified technician, for Hydrocarbon
systems, should service these coolers.
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Use extreme caution and follow all local/regional codes for
transportation or relocation of Hydrocarbon coolers.
venting procedure begins or use hoses
long enough to discharge it safely to
outside environment.
-
Attach gauges to both the high and low
sides of the system using an approved
method.
-
To
avoid
accidental
release
of
refrigerant and lubricant, ensure that
they are recovered/ vented safely from
the system before removing the failed
component of the sealed system.
-
Always recover the refrigerant from both
high and low sides of the system to
assure that no refrigerant is trapped in
the system.
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Purge the system with Oxygen Free Dry
Nitrogen (OFDN) several times to
ensure complete removal of refrigerant
from refrigeration system.
-
Achieve a 500 micron vacuum in the
refrigeration system using a certified
vacuum pump before replacing failed
sealed system component(s).
-
Use a tube cutter rather than a torch to
remove the failed component as shown
below. Using a torch may cause a fire
hazard, especially if the refrigerant has
not
been
completely
discharged/
recovered. If you must use a torch to
remove the failed component of sealed
system, do so while running dry nitrogen
continuously through the system.
Always use OEM parts only. Use of non-
OEM parts will not only void the warranty
but may also lead to a major fire,
explosion, severe injury or death.
Pressure Testing and Evacuation
-
Pressurise
the serviced refrigeration
system with oxygen free dry nitrogen
(OFDN) up to 150 psig.
-
Hold the pressure and check for
possible leak.
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Purge
OFDN
before
starting
the
evacuation process.
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Never use a compressor to evacuate a
system. Use a certified vacuum pump
with manifold gauges and initiate
evacuation..
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The discharge of the vacuum pump
must be vented to an open-air area.
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Ensure the refrigeration system holds a
vacuum pressure of at least 100 micron
before charging.
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Never attempt to start the compressor
while the system is under vacuum.
-
Always break a vacuum with refrigerant
charge before starting the compressor.
Charging refrigerant
-
Do not overcharge the refrigeration
system
(maximum 150 grams or 5.3
oz.) as per UL#471. Overcharging is a
safety hazard.
-
Use only recommended type and
amount of refrigerant as indicated on the
serial label