Sanyo CM1972 Technical & Service Manual page 46

(2) Current control
The operating frequency upper limits shown in the figure below are established for frequency reduction and
increase-prohibit.
Current(A) Example of operation during cooling
Trip
Hz reduction
Hz increase
prohibit
(16)
(15.6)
0
(30)
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)
(230)
5Hz every 30 sec. reduction
(223)
2Hz every 30 sec. reduction
(212)
No control
(194)
* 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.
Hz reduction
Hz increase prohibit
Hz reduction
Hz increase prohibit
Frequency (Hz)
Trip
Increase
prohibit range
(Hz reduction)
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