Mitsubishi Electric CITY MULTI PLFY-WL-NEMU-E Series Operation Manual page 10

3. Operation
Automatic operation (Single set point)
According to a set temperature, cooling operation starts if the room tem-
perature is too hot and heating operation starts if the room temperature
is too cold.
During automatic operation, if the room temperature changes and
remains 1.5 °C, 3 °F or more above the set temperature for 3 minutes,
the air conditioner switches to cool mode. In the same way, if the room
temperature remains 1.5 °C, 3 °F or more below the set temperature for
3 minutes, the air conditioner switches to heat mode.
Cool mode
3 minutes (switches from
cooling to heating)
Because the room temperature is automatically adjusted in order to
maintain a fi xed eff ective temperature, cooling operation is performed a
few degrees warmer and heating operation is performed a few degrees
cooler than the set room temperature once the temperature is reached
(automatic energy-saving operation).
<Auto (dual set point) mode>
Preset temperature
for cooling
Preset temperature
for heating
F1
MENU
1 The current preset temperatures will appear. Press the [F2] or [F3]
button to display the setting screen.
Preset temperature
for cooling
Preset temperature
for heating
F1
MENU
en
2 Press the [F1] or [F2] button to move the cursor to the desired
temperature setting (cooling or heating).
Press the [F3] button to decrease the selected temperature, and
press the [F4] button to increase.
• Refer to the table on page 7 for the settable temperature range for
different operation modes.
• The preset temperature settings for cooling and heating in the Auto
(dual set point) mode are also used by the Cool/Drying and Heat
modes.
• The preset temperatures for cooling and heating in the Auto (dual
set point) mode must meet the conditions below:
• Preset cooling temperature is higher than preset heating temperature.
• The minimum temperature difference requirement between cooling and
heating preset temperatures (varies with the models of indoor units
connected) is met.
* If preset temperatures are set in a way that does not meet the minimum
temperature difference requirement, both preset temperatures will
automatically be changed within the allowable setting ranges.
Navigating through the screens
• To return to the Main screen ...... [RETURN] button
8
3 minutes (switches from
heating to cooling)
Set temperature +1.5 °C, +3 °F
Set temperature
Set temperature -1.5 °C, -3 °F
79
83
68
F2 F3 F4
ON
RETURN SELECT
OFF
HOLD
8 83
6 6 6 6 68 6 6 6 6 6 6 6 6
RETURN
F2 F3 F4
ON
RETURN SELECT
OFF
HOLD
Automatic operation (Dual set point)
When the operation mode is set to the "Auto" (dual set point) mode, two
preset temperatures (one each for cooling and heating) can be set. De-
pending on the room temperature, indoor unit will automatically operate
in either the "Cool" or "Heat" mode and keep the room temperature within
the preset range.
The graph below shows the operation pattern of indoor unit operated in
the "Auto" (dual set point) mode.
Operation pattern during Auto (dual set point) mode
Preset temp.
(COOL)
Preset temp.
(HEAT)
HEAT COOL
Setback mode
Room temperature is controlled to stay within the set temperature range
that is specifi ed for the Setback mode. By leaving suffi cient temperature
diff erential between the set temperature for cooling (upper limit) and heating
(lower limit), it is possible to keep the room temperature within the specifi ed
range without overworking the air conditioners.
This setting will be especially eff ective during periods of non-occupancy.
Operation pattern during Setback mode
Set temp.
(SETBACK_COOL)
Set temp.
(SETBACK_HEAT)
HEAT
3.4. Fan speed setting
Fri
83
Room
Cool Set temp. Auto
83
Mode Temp. Fan
F1 F2 F3 F4
ON
RETURN SELECT
MENU
OFF
HOLD
Each pressing of the [F4] button cycles through the following fan speeds.
Auto Auto
• The available fan speeds depend on the models of connected indoor
units.
Notes:
● The number of available fan speeds depends on the type of unit
connected. Note also that some units do not provide an "Auto"
setting.
● In the following cases, the actual fan speed generated by the unit
will diff er from the speed shown the remote controller display.
1. While the display is showing "STAND BY" or "DEFROST".
2. When the temperature of the heat exchanger is low in the heat
mode. (e.g. immediately after heat operation starts)
3. In HEAT mode, when room temperature is higher than the
temperature setting.
4. In COOL mode, when room temperature is lower than the
temperature setting.
5. When the unit is in Drying mode.
The room temperature
changes corresponding
to the change in the
outside temperature.
Room
temperature
HEAT COOL
The room temperature
changes corresponding
to the change in the
Room
outside temperature.
temperature
COOL HEAT COOL