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Night Setback function (hereafter abbreviated as Setback) is a function that prevents indoor dew or
extreme temperature rise by heating/cooling automatically when the room temperature goes outside
of the specic range during the set time period.
C Setting the Night Setback function
• In a group where both Air To Water (PWFY) and air conditioning units are connected to Y series
outdoor unit, Setback function may not function properly.
• When the air conditioning group with Setback function is off and when the temperature exceeds the
preset temperature, heating/cooling operation starts.
• If the room temperature is measured by the air-conditioner’s suction temperature sensor, the
temperature may not be correct when the air-conditioner is inactive and the air is not fresh. When
the air-conditioner is inactive, using a remote sensor or a remote control sensor is recommended to
measure room temperature correctly.
• If the temperature setting, ON/OFF operation, or Timer (Schedule) execution is prohibited for this unit,
Setback operation cannot be used.
• If the operation mode change is prohibited or the operation mode selection is limited for this unit,
Setback function may not function properly.
When the Setback control is set, air conditioning group operates as shown below.
If “Unscheduled” is selected, the Setback function that were set on the [Setback Control] screen will not
be executed with the pressing of the Collective Operation button.
In this case, the settings that were made on the [Collective Operation] - [Setback] screen will override
the settings made on the [Setback Control] screen, and the scheduled operation will not run.
1. Touch the C Setback Control button on the [Time
and Schedule] screen.
2. Read the pop-up message, and touch the OK
button to confirm.
When the temperature drops below the lower limit temperature
(heating control)
When the temperature rises above the upper limit temperature
(cooling control)
Setback operation stops
(when the temperature
rise 3ºC/5.4ºF or the
control time period is over)
Setback
operation
starts.
Room
temperature
21ºC/69ºF
Heating
On
21ºC/69ºF
Heating
Off
Heating
On
12ºC/53ºF
Heating
Off
21ºC/69ºF
Setback control time period
Cooling
On
24ºC/75ºF
Cooling
Off
Cooling
On
28ºC/83ºF
Cooling
Off
24ºC/75ºF
Setback control time period
Setback
operation
starts.
3ºC/5.4ºF
Room
temperature
Upper limit
temperature
28ºC/83ºF
Lower limit
temperature
12ºC/53ºF
24ºC/75ºF
Main Menu > Operation Setting > Time and Schedule > Setback Control
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