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Table 4-1. TROUBLESHOOTING (cont.) - 506780091
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TM-5-4120-359-14 Air Conditioner Split Package 18 000 BTU/HR Cooling 30 000 BTU/HR Heating 208 Volt 3 Phase 400 Hertz Manual
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Table 4-1. TROUBLESHOOTING (cont.) - 506780093
TM 5-4120-359-14
Table 4-1. TROUBLESHOOTING (cont.)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
(b) Check for continuity between P14 contacts D and H. Resistance should be between 20 and 50
ohms.
(c) If resistance is between 20 and 50 ohms, go to step 2.
(d) Apply power. (Mode selector set to COOL.)
(e) Press high pressure cutout reset on back of air conditioner.
(f) If condenser blower motor fails to start immediately and compressor fails to start within 60
seconds, remove power from air conditioner.
(g) Check continuity through S4. Resistance should be less than two ohms.
(h) If resistance is less than two ohms, go to step 3.
(i) Check system pressure at HIGH SIDE service valve.
(j) Allow time for pressure to drop below 305 psig and manually reset.
If S4 cannot be reset - replace switch S4.
Step 2.
Check power to condenser electrical module.
(a) Remove electrical module, condenser.
(b) Disconnect P12 connector.
WARNING
The following test must be conducted with the power on.
Exercise extreme
caution.
(c) Apply power.
(d) Check voltage across P12 pins D and E, D and F, and E and F (should be 197 to 229 Vac).
Remove power.  Using wiring diagram figure 4-3, continuity check circuit and repair or
replace as indicated.
Step 3.
Check tow pressure switch S5.
(a) Check continuity through S5. Resistance should be less than two ohms.
(b) If it is less than two ohms, proceed to step 4.
(c) Check system pressure at LOW SIDE service valve.
(d) Switch S5 should automatically reset when pressure rises to 40 psig. Allow time for pressure to
rise and switch to reset.
If S5 will not reset, replace it.
4-10

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