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VARISTOR (RV4) AND TRANSFORMER (T1) TEST
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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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Figure 4-45. Varistor (RV4) and Transformer (T1)
TM 5-4120-359-14
WARNING
The following test must be conducted with the power on.
Exercise extreme
caution.
a. Connect power to air conditioner.
b. Using multimeter, check voltage across terminals 2 and 5. Voltage should be 197 to 229 Vac. If voltage is low or
there is no voltage, check for loose or broken connections and absence of power.
c.  Using multimeter, check voltage across terminals 7 and 8. Voltage should be 27 to 33 Vac. If voltage is low or
there is no voltage, transformer should be changed.
d. Remove power to air conditioner.
e. Check varistor for evidence of overheating. Replace if discolored or damaged.
4-46. VARISTOR (RV4) AND TRANSFORMER (T1)
For tests see paragraph 4-45.
Preliminary Procedures: Remove evaporator section electrical module assembly. (See paragraph 4-41.)
a. Removal
(1) Using screwdriver, remove six screws and lock washers.
(2) Lift top cover off.
4-101

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