After Starting Refrigeration Unit; 3.17 Microprocessor Operation - Carrier Supra 950MT Operation & Service Manual

10. Check engine air cleaner for cleanliness and condition of air cleaner hose.
11. Check defrost drain pan hoses (should be clear of debris).
3.16.2

After Starting Refrigeration Unit

1. Check engine speed.
2. Listen for abnormal noises. If present, control compressor pressures with a manometer.
3. Check compressor oil level (refer to
4. Observe any signs of lube or fuel oil leaks.
5. Check radiator hoses for leaks.
6. Check refrigerant level (refer to 3.4.1).
7. Feel filter drier. Excessive temperature drop across drier indicates restriction.
8. Check water temperature (150 to 180°F = 65 to 82°C).

3.17 MICROPROCESSOR OPERATION

In order to reduce starter cranking and engine loads when the engine is started, the microprocessor always starts
and operates in high speed, unloaded heat for the first 15 seconds. After the first 15 seconds, the microprocessor
allows the unit to operate normally, providing the coolant temperature is above 79°F (26°C).
Section 2.7.4 and Section
3-25
5.9).
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