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STAND-ALONE NIGHTTIME FREE COOLING
OPERATION
40
Outdoor
temperature
30
Set temperature
20
Indoor
temperature
ON
OFF
Nighttime free cooling operation
22:00
24:00
This is performed for independent systems and
centralized systems.
Temperature to be set can be selected by making fi eld
settings.
<Unit operation>
The total heat exchanger unit compares the indoor
and outdoor temperatures after it stops for the night.
If the following conditions are met, the operation
starts and when the indoor temperature reaches the
temperature setting of the total heat exchanger unit,
the operation stops.
Conditions;
1. The indoor temperature is higher than the
temperature setting of the total heat exchanger unit.
2. The outdoor temperature is lower than the indoor
temperature.
If the above conditions are not met, reevaluation is
made every 60 minutes.
• For other functions, see the operation manual of the
remote control.
5
4 MAINTENANCE
• Do not use flammable gas (such as hair spray
OFF
• Do not wash the total heat exchanger unit with
Following morning
(time)
• Be sure to stop the operation, and turn the
• Use gloves when cleaning.
• Watch your step when working in high places.
NOTE
• Do not operate the unit without air filter except
• When cleaning, replace heat exchange element
• Do not install anything (such as kitchen paper)
• Cleaning of air filter or heat exchange element,
• If water is in the unit, clean it by wiping it off with a
(for a qualified service person only)
WARNING
and insecticide) near the main unit. Do not wipe
the main unit and remote control with thinner,
etc.
This may cause cracks, electric shock, or ignition.
water (not including air filters).
If the electrical parts or motors get wet with water,
it may cause electric leakage, resulting in electric
shock or fire.
breaker off before cleaning or inspection.
As the fan inside the unit is rotating at high speed, it
will cause electric shock or injury.
CAUTION
Cleaning without gloves may cause injury.
If the scaffold is unstable, you may fall or topple
down thus causing injury.
during cleaning.
Missing air filter causes clogged heat exchange
element which may lower operation efficiency and
cause a failure.
if its' knob is found damaged or in deteriorating
condition as it is a potential dropping hazard.
other than the genuine air filters on the air inlet.
Doing so may lower operation efficiency and cause
freezing or leakage.
installation and replacement high-performance filter
(optional accessory) involves a work in high places
and it is dangerous.
Be sure to ask your dealer to have such works
done.
soft cloth.
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