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Table 4-1. TROUBLESHOOTING (cont.) - 506780094
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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.) - 506780096
TM 5-4120-359-14
Table 4-1. TROUBLESHOOTING (cont.)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 4.
Check compressor motor B1 windings.
(a) Remove power.
(b) Measure resistance between connector J10 pins:
A and B
A and C
B and C
(c) Resistances should be greater than zero, but less than one ohm.
If not, replace compressor.
8.
TEMPERATURE CONTROL NOT EFFECTIVE
Step 1.
Check temperature control A1. (See paragraph 4-47.)
Replace if found bad.
Step 2.
Check temperature sensing probe A1-RT. (See paragraph 4-20.)
Replace if found bad.
Step 3.
Check mode selector switch. (See paragraph 4-103.)
Replace if found bad.
Step 4.
Check wiring using wiring diagram figure 4-3.
Replace or repair as indicated.
9.
UNUSUAL NOISE OR VIBRATION
Step 1.
Examine air conditioner shock mounts and attaching hardware. Are shock mounts undamaged and
firmly attached? Is air conditioner properly alined with shelter adapter duct?
(1) Remove power.
(2) Assure there is no contact between the air conditioner and metal portion of shelter adapter
duct.
(3) Tighten loose screws.
(4) Install missing screws.
(5) Change defective shock mounts.
(6) Apply power.
Step 2.
Examine fresh air duct, all covers, and attaching hardware. Are air ducts and covers undamaged and
firmly attached to housing?
(1) Tighten loose screws.
(2) Install missing screws.
(3) Repair or change defective ducts and covers.
(4) Apply power.
Step 3.
Check evaporator section.
(a) Remove power.
(b) Remove top cover, evaporator.
(c) Examine all parts and attaching hardware.
(d) Check blower impellers for interference or being out of round.
(e) Are parts firmly attached? Do impellers spin freely without wobble?
(1) Tighten loose screws.
(2) Install missing screws, clamps, and brackets.
(3) Adjust position of impellers until they spin freely.
4-13

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