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98 SCXG-SVX01B-EN
• To assist in reducing power generation
emissions, always attempt to improve
equipment performance with improved
maintenance and operations that will
help conserve energy resources.
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ƽWARNING
Confined Space Hazards!
Do not work in confined spaces where
sufficient quantities of refrigerant or
other hazardous, toxic, or flammable gas
may be leaking. Refrigerant or other
gases could displace available oxygen to
breathe, causing possible asphyxiation
or other serious health risks. Some
gases may be flammable and or explo-
sive. Evacuate the area immediately and
contact the proper rescue or response
authority. Failure to take appropriate
precautions or to react properly to a
potential hazard could result in death or
serious injury.
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ƽWARNING
Hazard of Explosion!
Use only dry nitrogen with a pressure
regulator for pressurizing unit. Do not
use acetylene, oxygen or compressed air
or mixtures containing them for pressure
testing. Do not use mixtures of a
hydrogen containing refrigerant and air
above atmospheric pressure for pres-
sure testing as they may become
flammable and could result in an explo-
sion. Refrigerant, when used as a trace
gas should only be mixed with dry
nitrogen for pressurizing units. Failure to
follow these recommendations could
result in death or serious injury or
equipment or property-only damage.
Refrigerant System
Special Note on Refrigerant Emissions
Follow the Trane recommended
procedures on operation, maintenance,
and service to ensure refrigerant
conservation and emission reduction.
Also, pay specific attention to the
following:
• Whenever removing refrigerant from
air conditioning or refrigerating
equipment, recover for reuse, recycle,
reprocess (reclaim), or properly destroy
it.
• Always determine possible refrigerant
recycling or reclaiming requirements
before beginning recovery. Questions
about recovered refrigerants and
acceptable refrigerant quality
standards are addressed in ARI
Standard 700.
• Use approved containment vessels and
safety standards. Comply with all
applicable transportation standards
when shipping refrigerant containers.
• To minimize emissions while recovering
refrigerant, use recycling equipment.
Always attempt to use methods which
will pull the lowest possible system
vacuum while recovering and
condensing refrigerant into
containment.
• Be aware of any new leak test methods
which eliminate refrigerant as a trace
gas.
• When cleaning system components or
parts, do not use CFC11 (R11) or
CFC113 (R113). Refrigeration system
clean up methods using filters and
dryers are recommended. Do not use
solvents which have ozone depletion
factors. Properly dispose of used
materials.
• Take extra care to properly maintain all
service equipment directly supporting
refrigerant service work such as
gauges, hoses, vacuum pumps, and
recycling equipment.
• Stay aware of unit enhancements,
conversion refrigerants, compatible
parts, and vendor components and
manufacturer’s recommendations that
will reduce refrigerant emissions and
increase equipment operating
efficiencies. Follow specific
manufacturer’s guidelines for
conversion of existing systems.
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WARNING
Leak Testing!
Do not exceed 200 psig when leak
testing system. Failure to follow these
instructions could result in an explosion
causing death or serious injury.
In the event of required system repair,
leak test the liquid line, evaporator coil,
and suction line at pressures dictated by
local codes, and using the following
guidelines.
1. Charge enough dry nitrogen into the
system to raise the pressure to 100
psig.
2. Use a halogen leak detector, halide
torch, or soap bubbles to check for leaks.
Check interconnecting piping joints, the
evaporator coil connections, and all
accessory connections.
3. If a leak is detected, release the test
pressure, break the connections and
reassemble it as a new joint, using
proper brazing techniques.
4. If no leak is detected, use nitrogen to
increase the test pressure to 150 psig
and repeat the leak test. Also, use soap
bubbles to check for leaks when
nitrogen is added.
5. Retest the system to make sure new
connections are solid.
6. If a leak is suspected after the system
has been fully charged with refrigerant,
use a halogen leak detector, halide
torch, or soap bubbles to check for leaks.
Refrigerant Evacuation
For field evacuation, use a rotary style
vacuum pump capable of pulling a
vacuum of 400 microns or less.
When connecting the vacuum pump to a
refrigeration system, it is important to
manifold the pump to both the high and
low side of the system. Follow the pump
manufacturer’s directions.
Maintenance
maintenance
procedures