EVAPORATOR AIR OUTPUT VOLUME INSUFFICIENT

TM 5-4110-234-14

TO 40R7-5-7-1

Table 4-3. MODEL F10000RG-2 TROUBLESHOOTING (cont.)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Step 5.

Check if drive belt is loose or broken.

Adjust or replace (para 4-44).

Step 6.

Check for loose mounting hardware.

Tighten as needed.

Step 7.

Check engine (see para 4-59).

Repair or refer to higher level of maintenance as indicated.

4. EVAPORATOR AIR OUTPUT VOLUME INSUFFICIENT

Step 1.

Inspect screen for dirt and clogging.

Clean or replace screen (para 4-18).

WARNING

Disconnect power from the refrigeration unit before doing maintenance work on the internal parts. Moving

parts can cause injuries to personnel.

Step 2.

Evaporator fan loose, binding or damaged.

Tighten setscrews or relieve binding as necessary. Replace damaged fan (para 4-41).

Step 3.

Drive belt is loose or broken.

Adjust or replace (para 4-44).

Step 4.

Check evaporator coil for dirt.

Clean the coil.

Step 5.

Check evaporator coil for iced-up condition. If icing is found, it will usually indicate a low cooling

load, or that the thermostat is set too low, or that the air flow is blocked.

Do not use steam, open flame, heat gun or any other high-temperature heat source to thaw an iced coil.

Thaw an iced coil with a lamp bulb (75-watt maximum), hair drier, electric fan or by leaving the unit shut

down until ice melts.

5. COMPRESSOR FAILS TO OPERATE

Step 1.

Make sure refrigerator switch is set to ON.

Place switch in ON position.

Step 2.

Check if thermostat is not set at low enough temperature.

Adjust thermostat (fig. 4-3).

Step 3.

Check for loose or broken drive belt.

Adjust or replace (para 4-45).

Step 4.

Inspect power relay for breaks, cracks, corrosion, rust and loose electrical connections. Also

check continuity after removing relay.

Replace defective relay (para 4-33).

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