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Check reason for safety trip. Compressor restart is accomplished by manual reset of the thermostat by turning the selector switch to OFF position and then to ON position. Sequence of Operation — At start-up, the thermostat calls for cooling. With all safety devices satisfied, the compressor contactor and fan contactor energize, causing the compressor and outdoor (condenser) fan motor to operate. Contacts close, allowing the field-supplied and -installed indoor (evaporator) fan contactor to function. The recommended field-supplied and -installed liquid line solenoid valve will also open, allowing the system to function in cooling. As cooling demand is satisfied, the thermostat contacts break, deenergizing the contactor causing the system to shut off. The liquid line solenoid valve closes, minimizing the potential for refrigerant migration at this time. The compressor does not restart until the thermostat again calls for cooling. If a demand for cooling occurs within 5 minutes after the thermostat is satisfied, the system will not restart due to the feature of Time Guard II device. After the 5-minute time period, the system will restart as normal on thermostat demand. The system is protected by a Cycle-LOC device so that the compressor will not start if a high-pressure or low- pressure fault occurs. Compressor restart is accomplished by manual reset of the thermostat by turning the selector switch to OFF position and then to ON position. This should be done only once. If system shuts down due to the same fault, determine the problem before attempting to reset the Cycle- LOC device. Oil Charge (Tables 1A and 1B) 38AKS UNITS — Allow unit to run for about 20 minutes. Stop unit and check compressor oil level. Add oil only if necessary to bring oil into view in sight glass. Use only Carrier- approved compressor oil. Approved oils are: Suniso 3GS WF32-150 38AK UNITS — The 38AK units do not have a sight glass and are factory charged with the correct amount of oil. ALL UNITS — Do not reuse drained oil or use any oil that has been exposed to atmosphere. Procedures for adding or removing oil are given in Carrier Standard Service Techniques Manual, Chapter 1, Refrigerants. If oil is added, run unit for an additional 10 minutes. Stop unit and check oil level. If level is still low, add oil only after determining that piping system is designed for proper oil return and that system is not leaking oil. 10 SERVICE When servicing unit, shut off all electrical power to the unit to avoid shock hazard or injury from rotating parts. Cleaning — Inspect unit interior at the beginning of each cooling season and as operating conditions require. CONDENSER COIL — Inspect coil monthly. Clean condenser coil annually and as required by location or outdoor- air conditions. Clean coil as follows: 1. Turn off unit power. 2. Remove and save top panel screws on condensing unit. 3. Remove condenser coil corner post. See Fig. 10. To hold top panel open, place coil corner post between top panel and side panel. See Fig. 11. 4. Remove bracket holding coil sections together at return end of condenser coil. Carefully separate the outer coil section 3 to 4 in. (75 to 100 mm) from the inner coil section. See Fig. 12. 5. Use a water hose or other suitable equipment to flush down between the 2 coil sections to remove dirt and debris. Clean the outer surfaces with a stiff brush in the normal manner. 6. Reposition the outer coil section, and secure the coil sections together by reinstalling the brackets removed in Step 4. 7. Remove the coil corner post from between the top panel and side panel. 8. Install the coil corner post and replace all screws removed in Step 2. Fig.10—CleaningCondenserCoil Lubrication COMPRESSORS — Each compressor is charged with correct amount of oil at the factory. For additional information on 38AKS units, refer to the Oil Charge section on page 10. FAN MOTOR BEARINGS — Fan motor bearings are of the permanently-lubricated type. No further lubrication is required. Condenser-Fan Adjustment (Fig. 13) 1. Shut off unit power supply. 2. Remove condenser-fan assembly (grille, motor, motor cover, and fan). Fig.11—ProppingUpTopPanel Fig.12–SeparatingCoilSections NOTE:Fanheightadjustmentsareasfollows: UNITin.mm38AK007(60Hz) All50-HzUnits4.50114All60-HzUnits(Except38AK007)6.42163 Fig.13—Condenser-FanAdjustment 3. Loosen fan hub setscrews. 11 4. Adjust fan height as shown in Fig. 13. 5. Tighten setscrews. 6. Replace condenser-fan assembly. Capacity Control — Unit 38AKS012 Only — A suction pressure-actuated unloader controls 2 cylinders and provides capacity control. Unloaders are factory set (see Table 1A or 1B), but may be field adjusted as follows: CONTROL SET POINT (cylinder load point) is adjustable from 0 to 85 psig (586 kPa). To adjust, turn control set point adjustment nut (Fig. 14) clockwise to its bottom stop. In this position, set point is 85 psig (586 kPa). Then, turn adjustment counterclockwise to desired control set point. Every ...

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