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Table  4-1. Organizational  Preventive  Maintenance  Checks  and  Services
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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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AIR CONDITIONER FAILS TO OPERATE - TM-5-4120-361-14_53
TM 5-4120-361-14 Section VI. TROUBLESHOOTING 4-18. General. This section contains troubleshooting instructions for the isolation of causes and common troubles that may occur dur- ing operation, and also gives the pos- sible remedies to correct the trouble. 4-19. Organizational  Troubleshooting Chart. a. General. Troubleshooting proce- dures for organizational maintenance personnel are listed in table 4-2. AS shown in the table, troubleshooting be- gins by identifying the malfunction. Next,   suitable tests or inspections are made in step-by-step order. Finally,  a corrective action is given. Remedies beyond the scope of organizational main- tenance must be reported to direct sup- port maintenance personnel. Additional procedures are given in paragraphs(b) and  (c)  which  follow: b. Control  Circuit. The cause for the–failure of the system to operate can be narrowed to a specific portion of the system if the control component associ- ated with the failure can be isolated. It is the purpose of safety devices to open the circuit under certain overload or  fault  conditions. If a safety device is open, additional checking is required to determine if the open is due to a faulty safety device or if the safety device is performing its intended func- tion,   and the fault is located elsewhere in the system. To check the control circuit, proceed as follows: (1) Disconnect air conditioner from source  of  power. (2) Using a series test lamp or ohmmeter, check the continuity through each control in the affected circuit with the control in the closed position while being checked. Use the system schematic and wiring diagram for point- to-point circuit tracing. (3) Replace each defective part with a serviceable like item. c. Safety  Devices. When testing the control circuit and associated compo- nents, take into account the normal state of the safety device. Determine (1) whether it is normal for the device to be open under the existing conditions or (2) if the open condition indicates trouble elsewhere in the air condition- er. 4-8

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