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2
Features
2 - 3 Night time free cooling operation
Automatic heat purge function at night
The nighttime free cooling is an energy-conserving 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. This is mainly for rooms that contain office equipment, which raises the room temperature.
1
•
Nighttime free cooling only works during cooling and when connected to Building Multi or VRV systems.
•
Nighttime free cooling is set to "off" in the factory settings; so request your dealer to turn it on if you intend to use it.
2
Operation image
40
(a)
30
(b)
20
OFF
OFF
22:00
Explanation of nighttime free cooling operation image
The unit compares the indoor and outdoor temperatures after the air conditioning operation stops for the night. If the following conditions are satisfied,
the operation starts, and when the indoor temperature reaches the air conditioning setting, the operation stops.
Conditions
2
the indoor temperature is higher than the air conditioning setting and
3
the outdoor temperature is lower than the indoor temerature.
If the above conditions are not satisfied, reevaluation is made every 60 minutes.
NOTE
The Nighttime free cooling operation works when the HRV unit is off. Therefore, it is not possible to stop the night purge operation, though the
forced off is input from the optional controllers for centralized control.
Test run
After completing the installation of the system, check again to make sure that no error was made in wiring or switch setting on the printed
circuit boards of the HRV units.
Then, turn on the power of the HRV units. Refer to the manual of the remote controller of each unit (remote controller for air conditioner, central control
unit, etc.) for conducting a trial operation.
6
• Heat reclaim ventilation • VAM-FA/FB
(c)
ON
OFF
Nighttime free cooling operation
(time)
24:00
Following morning
• Ventilation • Heat reclaim ventilation
(a) Outside temperature
(b) Indoor temperature
(c) Set temperature
(d) Operating state of Air conditioner
(e) Operating state of Total heat exchanger
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