4
3-2 NIGHTTIME FREE COOLING
OPERATION
The nighttime free cooling is an energy-saving
function which works at night when the air
conditioners is off; reducing the cooling load in the
morning when the air conditioner is turned on by
ventilating rooms which contain office equipment
which raises the room temperature.
• Nighttime free cooling operation can be performed
as stand-alone operation or combined operation.
• The operation lamp on the remote control is OFF
during the nighttime free cooling operation.
• Nighttime free cooling is set to “off” in the factory
settings. Request your dealer to turn it on if you intend
to use it.
COMBINED NIGHTTIME FREE COOLING
OPERATION
OFF
ON
OFF
OFF
22:00
24:00
40
30
20
Outdoor
temperature
Indoor
temperature
Set temperature
Nighttime free cooling operation
Following morning
(time)
T
emper
ature
T
otal heat
e
xchanger
Air
conditioner
Nighttime free cooling only works during cooling and
when combined with Sky Air or VRV systems.
<
Unit operation
>
The unit compares the indoor and outdoor
temperatures after the air conditioner stops for the
night. If the following conditions are met, the operation
starts and when the indoor temperature reaches
the temperature setting of the air conditioner, the
operation stops.
Conditions;
1. The indoor temperature is higher than the
temperature setting of the air conditioner combined.
2. The outdoor temperature is lower than the indoor
temperature.
If the above conditions are not met, reevaluation is
made every 60 minutes.
The product’s method of use varies according to
each system.
Check with the dealer on what system has the product
been installed with prior to operation.
For operations of remote controls and centralized
controller, see their respective operation manual.
NOTE
• When the fan motor fails, the remote controller does
not display any error code.
Usage under that status will lead to insufficient
ventilation.
The air supply and exhaust fans should be checked
once every one or two months.
You can make a simple check such as below way.
To check the wind flow, hold a bar of which the end
has a string or other similar lightweight item over
the supply grille and exhaust grille.
3 OPERATION PROCEDURE
3-1 24-HOUR VENTILATION
OPERATION
The 24-hour ventilation operation is an automatic
function that provides ventilation even after the
operation has been stopped in order to prevent sick
building and sick school syndrome.
After the operation is stopped, the unit switches to
continuous operation at low fan speed or intermittent
operation.
•
24-hour ventilation operation is set to “off” in the
factory settings.
Request your dealer to turn it on if you intend to use
it.
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