About Nighttime Free Cooling Operation - Daikin VAM-J8 Series Manual

17 | Configuration
To install the components

17.5.4 About nighttime free cooling operation

Installer and user reference guide
94
1 Close the switch box cover.
2 Install the components. Follow the reverse procedure of
4
components" [ 91].
Nighttime free cooling function
The nighttime free cooling function is an energy-conserving function that works at
night, when the air conditioner is off. This reduces the cooling load in the morning,
when the air conditioner is switched on. This is mainly for rooms that contain office
equipment that raises the room temperature.
40°C
a
30°C
b
20°C
OFF
e
OFF
d
22:00
a Outside temperature
b Indoor temperature
c Set temperature
d Operating state of air conditioner
e Operating state of heat reclaim ventilation unit
f Nighttime free cooling operation
Explanation
The unit compares the indoor and outdoor temperatures after the air conditioning
stops running for the night. If the conditions below are met, nighttime free cooling
starts. When the indoor temperature reaches the air conditioning setting,
nighttime free cooling stops.
Conditions
▪ The indoor temperature is higher than the air conditioning setting.
▪ The outdoor temperature is lower than the indoor temperature.
If the above conditions are NOT met, re-evaluation takes place every 60 minutes.
INFORMATION
Nighttime free cooling operation works when the heat reclaim ventilation unit is off,
so it is NOT possible to stop this function.
Setting 17(27)‑1 sets the number of hours that have to pass before the conditions
for the free cooling function are checked.
Setting 17(27)‑6 sets whether the fan runs in high or ultra high mode during the
free cooling.
Setting 17(27)‑7 sets the temperature.
c
ON OFF
f
24:00
"To remove the
h
VAM350~2000J8VEB
Heat reclaim ventilation unit
4P664012-1 – 2021.08