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EVAPORATOR COIL INSPECTION INSTALLED/CLEANING
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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 4-31. Evaporator Coil and Tubing Removal/Installation
TM 5-4120-359-14
(2) Check fins for dents, bent edges, or any condition that would block or distort air flow. Straighten all damaged
fins with a plastic fin comb.
WARNING
Compressed air used for cleaning purposes will not exceed 30 psi (2.1 kg/cm2).
CAUTION
Do not use steam to clean coil.
b. Cleaning. Clean coil with a soft bristled brush, vacuum cleaner and brush attachment, or use compressed air at
30 psi or less from the inside of the coil to blow the dirt out. Take care to avoid fin damage. When using compressed air
wear safety glasses or goggles. Dirt can be blown into your eyes.
c.
Repair/Replacement. Should a leak or major damage be evident go to paragraph 4-34.
Follow-on Procedures: 1. Install fan and motor assembly. (See paragraph 4-21.)
2. Install return air screen and frame. (See paragraph 3-18.)
4-34. EVAPORATOR COIL
For inspection installed/cleaning, see paragraph 4-33.
Preliminary Procedures:
1. Remove air conditioner from shelter. (See paragraph 3-6.)
2. Remove return air screen and frame. (See paragraph 3-18.)
3. Remove access cover. (See paragraph 3-14.)
4. Remove front evaporator cover and radio frequency filter. (See paragraphs 3-17 and 4-17.)
5. Remove the heater assembly. (See paragraph 4-32.)
6. Discharge the refrigerant system. (See paragraph 4-5.)
a. Removal
(1) Using screwdriver, remove the three screws that hold the three clamps that support the expansion valve and
expansion valve capillary line.
(2) Using wrench, carefully disconnect the low and high condenser to evaporator refrigerant metal hose line
connectors from the coupling halves. (See figure 4-8.)
(3) Using wrench, remove the two each jam nuts and gasket seals from the inside of the access area.
WARNING
When handling coils, wear gloves to avoid cuts and reduce fin damage on the coil.
4-77

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