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Section VI. TROUBLESHOOTING
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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_54
TM 5-4120-361-14 Table 4-2. Note: Before you use this table, be sure you have performed all applicable MALFUNCTION TEST OR INSPECTION CORRECTIVE  ACTION 1. AIR CONDITIONER FAILS TO OPERATE Step 1. Step 2. Step 3. Step 4. Step 5. Step 6. Check to see if main power cable is connected. Connect cable to power source. Check to see if main power receptacle is defective. Replace defective connector. Check for loose electrical connections. Tighten loose connections. Check to see if mode selector rotary switch is or is defective. Turn selector to COOL or VENT. Replace switch (para 4-26). improperly  positioned if  defective Check to see if control circuit breaker or compressor circuit breaker is in OFF position or is defective. Reset circuit breaker(s) or replace defective circuit breaker (para 4-26). Remove service valve access panel (figure 1-2) and check to see if high pressure or low pressure switch has cutout. Reset high pressure or low pressure cutout . Note that time delay relay starts compressor 30 seconds after reset. Test control circuit transformer and rectifier for faulty operation. Replace defective transformer and/or rectifier (para 4-28 and 4-29). Step 7. 2. INSUFFICIENT COOLING Step 1. Check to see if the mode selector switch is improperly positioned. Set switch to COOL. Step 2. Check to see if temperature selector control is improperly positioned or is defective. Adjust setting or replace switch (para 4-26). 4-9

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