Maintenance
5.Reinstall the filter by reattaching the hook to the bottom of the vent door and replacing the two screws, slide the chassis back into the wall sleeve, secure it in place with six screws and reinstall the front cabinet.
Vent door
Figure 20. Vent (left side of unit)
Figure 21. Vent filter removal
Scheduled Maintenance
To achieve top performance and high efficiency, a cleaning/ inspection schedule must be established for this unit. Maintaining this schedule can be accomplished by either a local maintenance staff or an authorized servicer and must follow the instructions described in this manual.
•If the unit is operated in a dusty climate, dust may collect in the basepan and clog the condenser coil. It is advisable to remove the unit from the sleeve and thoroughly clean the basepan and condenser coil on a periodic basis.
•If the unit is installed ocean side or in a corrosive atmosphere, its life may be greatly reduced by the corrosive environment. Under these conditions the unit should be removed from the sleeve and completely cleaned at least four times per year. At that time any scratches or blisters on the painted surfaces should be sanded and repainted.
Refrigeration System Service
WARNING
Ensure Terminal Cover is in Place!
Do not plug in this product or apply power to the compressor if the compressor terminal cover is removed or is not firmly in place. Failure to follow these instructions could result in a fire that could cause death, personal injury, or property damage.
Service operations requiring opening of the hermetically sealed refrigeration system should be taken to a well equipped shop where special equipment for evacuating, dehydrating, charging and testing is available. The following equipment is necessary:
•Nitrogen of no more than 0.0012 grains of moisture.
•Vacuum pump capable of evacuating to a minimum of 50 microns.
•Micron gauge to check vacuum
•Refrigerant charging cylinder accurate to within 1/4 oz.
•Electronic leak detector
•Electrical equipment to test compressors, capacitors, voltage relays, and overload protectors
•Voltmeter, ammeter, and wattmeter
•Silver soldering and brazing equipment - Pinch off tools ¼ in to 5/8 in
•Thermocouple tester
WARNING
Hazardous Pressures!
If a heat source is required to raise the tank pressure during removal of refrigerant from cylinders, use only warm water or heat blankets to raise the tank temperature. Do not exceed a temperature of 150°F. Do not, under any circumstances 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 immediate medical attention. Direct contact with liquid refrigerant may cause minor or moderate injury.
Dehydrating and Evacuating Refrigeration System
A rather popular misconception exists that since air conditioners normally operate with a refrigerant temperature above 32°F, moisture in the system is harmless. Nothing could be further from the truth.
Oxygen from moisture plus normal compressor and motor heat reacts chemically with the refrigerant and oil to form corrosive hydrochloric and hydrofluoric acids. These acids contribute to the break down of motor winding insulation and the corrosion of compressor working parts and cause unnecessary compressor failure.
Sludge, which is a residue of the chemical reaction, coats all compressor parts, the inside of refrigerant tubing, and may even restrict refrigerant flow through the capillary tube(s).
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