Trane SCXG-SVX01B-EN manual Motor Winding Damage, Use of Pressure Regulator Valves Gauges, R407c

maintenance

Maintenance procedures

NOTICE

Motor Winding Damage!

Do not use a megohm meter or apply voltage greater than 50 DVC to a compressor motor winding while it is under a deep vacuum.Voltage sparkover may cause damage to the motor windings.

Refrigerant Charging

• R22 units

After leak testing and evacuating the system, charge liquid refrigerant into the system through the liquid line valve. After some refrigerant has entered each circuit, charge gaseous refrigerant into the suction line shrader valve with the compressors running.

•R407c

After leak testing and evacuating the system, charge liquid refrigerant into the system through the liquid line valve.

NOTICE

Compressor Damage!

Do not operate the compressors without some refrigerant in each circuit. Failure to do so may result in compressor damage.

Special Note on Refrigerant Emissions Follow theTrane recommended procedures on operation, maintenance, and service to endure refrigerant conservation and emission reduction. Also, pay specific attention to the following:

•When removing refrigerant from air conditioning or refrigerating equipment recover for reuse, recycling, reprocessing (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 when shipping

refrigerant containers.

•To minimize emissions while recovering refrigerant, use recycling equipment. Always attempt to use methods that will pull the lowest possible system vacuum while recovering and condensing refrigerant into containment.

•Be aware of any new leak test methods that eliminate refrigerant as a trace gas.

•When cleaning system components or parts, do not use CFC11 (R11) or CFC 113 (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 manufacturer’s recommendations that will reduce refrigerant emissions and increase equipment operating efficiencies. Follow specific manufacturer’s guidelines for conversion of existing

systems.

•To assist in reducing power generation emissions, always attempt to improve equipment performance with improved maintenance and operations that will help conserve energy resources.

Refrigerant LeakTesting

It is important to follow all warnings and cautions in this section when leak testing equipment.

￿WARNING

Use of Pressure Regulator -

Valves - Gauges!

Always use pressure regulators, valves, and gauges to control drum and line pressures when pressure testing equipment. Failure to follow these instructions could result in an explosion causing death, serious injury, or equip- ment damage.

￿WARNING LeakTesting!

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, using the following guidelines.

1.Charge enough refrigerant and dry weight. Use an accurate scale or charging cylinder to determine the exact weight of the refrigerant entering the system. Failure to use either a scale or a charging cylinder can lead to undercharging or overcharging resulting in unreliable operation.

￿WARNING Hazardous Pressures!

If a heat source is required to raise the tank pressure during removal of refriger- ant from cylinders, use only warm water or heat blankets to raise the tank temperature. Do not exceed a tempera- ture of 150°F. Do not under any circum- stances apply direct flame to any portion of the cylinder. Failure to follow these safety precautions could result in a violent explosion, which could result in death or serious injury.

￿CAUTION Freezing Temperatures!

Do not allow liquid refrigerant to contact skin. If it does, treat the injury similar to frostbite. Slowly warm the affected area with lukewarm water and seek immedi- ate medical attention. Direct contact with liquid refrigerant may cause minor or moderate injury.

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