Sanyo CMH3172 Service Manual - Page 46
Low Start Current, Compressor Temperature Control
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(2) Current control The operating frequency upper limits shown in the figure below are established for frequency reduction and increase-prohibit. Current(A) Trip Hz reduction Hz increase prohibit Example of operation during cooling Hz reduction Hz increase prohibit (16) (15.6) 0 Hz reduction Hz increase prohibit (30) Frequency (Hz) 7-2-2. Low Start Current Operation starts at (8 Hz), and the start current is less than the normal operating current. This prevents the flickering of fluorescent lights or television screens that occurs when ordinary A/C units start. 7-2-3. Compressor Temperature Control To protect the compressor coil from overheating, the operating frequency is controlled based on the compressor discharge temperature. (°F) Compressor discharge temperature Trip (230) (223) (212) (194) 5Hz every 30 sec. reduction 2Hz every 30 sec. reduction No control Increase prohibit range (Hz reduction) * Within the increase-prohibit range, the range changes to the Hz reduction range (2 Hz every 30 seconds) if the compressor temperature rises by 4 °F. 46
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