Sanyo CMH1972 Technical & Service Manual page 48

Frequency control
(1/f fluctuation fan)
Control/conditions
SENSOR
The ON/OFF operation
button on the remote
DRY
controller is pressed.
The room temperature
reaches the desired
temperature, and there
is no need for further
cooling.
The room temperature is
59 °F or higher, and is
slightly too cold.
The room temperature is
below 59 °F.
(Hz)
Outdoor air temperature is below 32 °F.
(25) Hz
(35) Hz
(45) Hz
(55) Hz
Unit operation
The operation lamp illuminates.
The indoor fan operates at the set fan speed.
The outdoor unit stops.
The outdoor unit starts.
(Compressor and the outdoor fan start.)
When the frequency reaches
frequency increases are stopped for a period
of seconds. (Refer to Table 2.)
The frequency then increases.
DRY operation starts
DRY A operation
The indoor fan changes between "Low"
and "LL" (very low) over a 6-minute cycle.
This is 1/f fluctuation fan operation.
(Refer to Fig. 2.)
DRY B operation
(1) The indoor fan changes between "Low"
and "LL" (very low) over a 6-minute cycle.
This is 1/f fluctuation fan operation.
(2) After appoximately 3 minutes, the
compressor turns OFF, the outdoor fan
turns OFF, and the indoor fan turns OFF.
(3) After approximately 6 minutes, the
conditions return to (1).
Monitoring operation begins.
(senconds)
Outdoor air temperature is 32 °F or higher.
(120) seconds
(60) seconds
(60) seconds
(180) seconds
Table 2
The outdoor unit does not operate for 3 minutes
even after the breaker is turned ON.
Hz, This is in order to stabilize the return of oil to the
compressor.
If the indoor and outdoor temperatures are high,
the current peak cut-off activates, stopping
any increases in frequency.
Operating frequency is stabilized in order to
maintain a comfortable environment.
The compressor operates on a 3-minutes ON,
6-minutes OFF cycle, to prevent the room
temperature from dropping too much.
When monitoring operation begins, the
compressor stops, and the indoor fan operates at
"LL" (very low) speed.
48
(60) seconds
(30) seconds
(30) seconds
(90) seconds
Explanation
The frequency is increased at the rate of 0.5
Hz every 1 seconds.
Operates to effectively dehumidify the air while
not excessively reducing the indoor
temperature.
The indoor unit operates at 1/f fluctuation fan
operation, at a fan speed that does not cause
a chilly feeling.