TM-9-2320-280-34 HMMWV Direct Support & General Support Maintenance Manual Download
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14-20. AIR-CONDITIONING EVAPORATOR MAINTENANCE (Cont'd) 1. Remove low pressure switch (23) form outlet line (25). 2. Remove two capscrews (13), nuts (16), clamps (14), and pressure lines (11) and (19) from brackets (17). 3. Disconnect pressure lines (19) and (11) from sight glass (20) and remove sight glass (20), pressure line (19), and two O-rings (12). Discard O-rings (12). 4. Disconnect pressure line (11) from expansion valve (4). Remove and discard O-ring (10). 5. Remove two capscrews (6), nuts (18), brackets (17), and spacers (15) from evaporator (2). 6. Disconnect expansion valve line (5) from outlet line (25). Remove and discard O-ring (7). 7. Remove moisture seal (24) from evaporator outlet line (25) and expansion valve control tube (8). Discard moisture seal (24). 8. Loosen clamp (9) securing control tube (8) to evaporator outlet line (25). 9. Disconnect expansion valve (4) from evaporator inlet line (1) and remove expansion valve (4) and O-ring (3). Discard O-ring (3). 10. Remove two screws (22) and drain pan (21) from evaporator (2) . 11. Inspect evaporator (2), expansion valve (4), pressure lines (11), (19), and (5), sight glass (20), and low pressure switch (23) for stripped threads, cracks, evidence of leakage, and damage. Replace sight glass and any other component if cracked, damaged, threads are stripped, or leakage is evident. 1. Install drain pan (21) on evaporator (2) with two screws (22). CAUTION • To prevent damage to control line tube during installation of expansion valve, avoid excessive bending or kinking of expansion valve control tube. • Avoid over tightening of expansion valve control tube retaining clamp. NOTE FR-12 systems require different O-rings and lubricating oil. 2. Lubricate O-ring (3) with refrigerant oil, install O-ring (3) and connect expansion valve (4) on evaporator inlet line (1). 3. Lubricate O-ring (7) with refrigerant oil, install O-ring (7) and connect expansion valve line (5) on outlet line (25). 4. Install control tube (8) on outlet line (25) with clamp (9). Do not overtighten. 5. Install low pressure switch (23) on outlet line (25). 6. Insulate control tube (8), evaporator inlet line (1), and outlet line (25) with moisture seal (24). 7. Install two brackets (17) and spacers (15) on evaporator (2) with two capscrew (6) and nuts (18). 8. Lubricate O-ring (10) with refrigerant oil, install O-ring (10) and connect pressure line (11) on expansion valve (4). NOTE Sight glass window must face away from outlet line. 9. Lubricate two O-rings (12) with refrigerant oil, install two O-rings (12) and connect pressure lines (11) and (19) on sight glass (20). 10. Install two clamps (14) and pressure lines (11) and (19) on bracket (17) with two capscrews (13) and nuts (16). b. Disassembly c. Assembly TM 9-2320-280-34 14-110 Change 1