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Table 4-1. TROUBLESHOOTING (cont.) - 506780093
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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.) - 506780095
TM 5-4120-359-14
Table 4-1. TROUBLESHOOTING (cont.)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
(c) Test for continuity between J11 pins E and F. Resistance should be less than two ohms.
(d) Allow 3/4 hour for motor to cool and switch S7 to reset.
If S7 resets, determine reason for motor overheating. If S7 does not reset - replace the
motor.
7.
COMPRESSOR FAILS TO START
(Evaporator and condenser blower motors start.)
Step 1.
Check for power at compressor P10 connector.
(a) Disconnect P10 connector.
(b) Insert jumper between P10 pins D and E.
(c) Measure voltage across pins A and B, B and C, and A and C of P10 (allow for 60 second delay
after turning selector switch to COOL mode and temperature control to maximum COOLER).
Voltage should be 197 to 229 Vac.
(d) If voltage is 197 to 229 Vac, go to step 4; if not, go to step 2.
Step 2.
Check time delay relay K6. (See paragraph 4-96.)
Replace if found bad.
Step 3.
Check relay K1. (See paragraph 4-94.)
Replace if found bad.
4-12

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