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Page Title:
Table 4-1. TROUBLESHOOTING (cont.) |
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 TM 5-4120-359-14
Table 4-1. TROUBLESHOOTING (cont.)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
(d) Measure condenser discharge air temperature which should be 35 5 F above ambient.
(e) Measure temperatures of air going into (return) and out of (discharge) evaporator section.
Discharge should be 20 5 F lower than return air temperature.
Step 9.
Check liquid line solenoid valve L2 coil. (See paragraph 4-69.)
Replace coil only, if found bad.
Step 10.
Check pressure equalizing solenoid valve L1 coil. (See paragraph 4-69.)
Replace coil only, if found bad.
Step 11.
Check temperature control A1 (See paragraph 4-47.)
Replace if found bad.
Step 12.
Check temperature sensing probe A1-RT (See paragraph 4-20.)
Replace if found bad.
Step 13.
Check mode selector switch S1. (See paragraph 4-103.)
Replace if found bad.
Step 14.
Check solenoid L2 valve body action. (See paragraph 4-69.)
Replace solenoid valve if found bad.
Step 15.
Check solenoid L1 valve body action. (See paragraph 4-69.)
Replace solenoid valve if found bad.
Step 16.
Check evaporator expansion valve. (See paragraph 4-36.)
Replace if found bad.
Step 17.
Check for totally discharged refrigerant system. (See paragraph 4-11.)
Repair as indicated.
Step 18.
Check time delay relay (K6). (See paragraph 4-96.)
Repair as indicated.
3.
COOLING ACTION STOPS AFTER OPERATING A SHORT TIME
Step 1.
DELETED
Step 2.
Check outside covers on condenser section.
(a) Remove power.
(b) Inspect condenser section for loose, damaged, or missing covers and screws.
(1) Tighten loose screws.
(2) Install missing covers and screws.
(3) Repair or change damaged covers.
(4) Allow 30 minutes after compressor stops for pressure to drop to reset pressure.
(5) Manually reset high pressure switch (S4).
(6) Apply power.
Step 3.
Check for blocked condenser EMI screens.
Remove blockage/clean EMI screens.
Step 4.
Check operation of condenser discharge vanes. (See paragraph 4-60.)
Replace/repair parts as indicated.
Step 5.
Check relay K2. (See paragraph 4-95.)
Replace if found bad.
4.
INSUFFICIENT HEATING
Step 1.
Check to see that MODE SELECTOR SWITCH is properly positioned.
Set switch to LOW HEAT or HIGH HEAT.
4-8 Change 6
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