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Figure  4-21. Drain tubes, (2) Refer to figure 4-21 and re- move clamps which hold plastic drain tubes  to  fittings. c. Inspection and Servicing. (1) Inspect tubes for cracks, ob- structions and loose connections. (2)  Clean  tubes  with  low  pressure compressed air or flush with water. d. Installation. (1) Refer to figure 4-21 and re- place tubes and clamp securely. (2) Refer to figure 4-1 and re- place the evaporator inlet louver. 4-36. Liquid Line Solenoid Valve, L1 a. General. The normally-open liq- uid line solenoid valve is electrically closed when the mode selector switch is turned to COOL. When the temperature control thermostat is satisfied, the liquid line solenoid valve opens placing the refrigerant system in the bypass condition. removal and installation - TM-5-4120-361-14_76
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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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Vent  Damper  Actuator
TM 5-4120-361-14 b. Inspect. (1) Refer to figure 4-4 and remove top  front  cover. (2) Remove the valve cover and in- spect coil for cracks, breaks, loose connections, frayed wires or other de- fects. (3) During the cooling cycle, in- spect the compressor suction line. If it feels hot,   the pressure equalizing solenoid valve (figure 5-7) is defec- tive. (4) Report all defects to direct supprt maintenance. c. Test. Test the pressure equaliz- ing solenoid valve for continuity across electrical leads with a multimeter. If no continuity is indicated, the valve is defective and should be replaced. Re- port all defects to direct support main- tenance. 4-38. Expansion Valve (Primary) Inspec- tion  and  Test. a. General. If the air conditioning units  is  not  cooling  properly,  inspect and test the expansion valve for de- fects. b. Inspection. (1) Refer to figure 4-4 and remove top  front  cover. (2) Refer to figure 4-22 and para 5-29c(4)  and check that the required length of the expansion valve’s sensing bulb is fully in the suction line bulb well. (3) Refer to figure 4-22 and exam- ine the flow restrictor capillary tubes carefully. They should be very cold and evenly frosted. Unfrosted tubes are blocked and should be re-placed. (4) If none of the capillary tubes is cold and frosted, the valve is Figure  4-22. Expansion valve, primary 4-33

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