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Figure  5-1. Refrigerant flow diagram
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TM-5-4120-361-14 Air Conditioner Vertical Compact 18 000 BTU/HR 208 Volts 3 Phase 50/60 Hz (Model 18K 208 3 60) Manual
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INSUFFICIENT COOLING - TM-5-4120-361-14_84
(figure 6-3) TM 5-4120-361-14 Table  5-1. Troubleshooting. MALFUNCTION TEST OR INSPECTION CORRECTIVE  ACTION 1. COMPRESSOR WILL NOT START Step 1. Step 2. Step 3. Step 4. Test for an open-circuit condition in the control circuit by means of a continuity check. Replace component or wire causing open circuit (para 4-32). Test circuit breaker for defective operation. Replace defective circuit breaker (para 4-26). Check to see if high or low pressure cutout switch is defective. Replace defective switch (para 5-22). Check to see if compressor motor or thermal protectors are defective. Replace compressor (para 5-16). 2. COMPRESSOR STARTS BUT IMMEDIATELY STOPS Step 1. Check to see if thermal protector or circuit breaker is tripped. Reset circuit breaker, or allow thermal protector to cool and reset. If condition repeats, replace compressor (para 5-16). 3. LITTLE OR NO HEATING CAPACITY. Step 1. Step 2. Step 3. Step 4. Check for loose electrical connections or faulty wiring. Repair or replace wiring as necessary (para 4-32). Test mode selector switch and temperature selector for faulty closure in heat control circuit. Replace defective switch (para 4-23). Test heater relay for faulty contact closure. Replace defective relay (para 4-27). Test for defective operation of heater high temperature cutout, Step 5. 4. INSUFFICIENT COOLING Step 1. Test for low refrigerant charge. Replace defective thermostat switch (para 4-30). Test heater for open-circuited element. Replace defective heaters (para 4-30). 5-3

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