8-3. Automatic Switching between Cooling and Heating
When AUTO mode is selected, the microprocessor calculates the difference between the set temperature and
the room temperature, and automatically switches to COOLING or HEATING mode to maintain the desired
temperature.
Room temp.
Set temp. COOL
Room temp. < Set temp. HEAT
This means that if the room temperature is higher than or equal to the set temperature, COOLING operation
begins. If the room temperature is lower than the set temperature, HEATING operation begins.
NOTE
Example of operation in the AUTO mode with the set room temperature at 23 C.
27
26
25
24
23
22
21
20
A
B
C
C
B
A
Zone
19
If one of the following conditions occurs, the air conditioner changes the
operation mode (from cool to heat or vice versa).
ZONE A:
ZONE B:
ZONE C:
FFOFFO
Compressor
Operation mode
Room temperature
Heating gnilooCgnilooC
ON ON ON
More than
1 hour
Within
1 hour
Example:
The mode changes if the difference between the room
temperature and the set temperature is at least 3 C.
The mode changes if the difference between the room
temperature and the set temperature is at least 1.5 C.
if 1-hour has elapsed after the compressor is stopped.
The mode does not changes if the difference between the
room temperature and the set temperature is within 1.5 C.
Set temp.
47
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