About Nighttime Free Cooling Operation - Daikin VAM350J VEB Series User Reference Manual

To install the components

17.5.4 About nighttime free cooling operation

VAM350~2000J*VEB*
Heat reclaim ventilation unit
4P664012-1A – 2024.01
5 Clamp the CO₂ sensor wire together with the damper switch (red) and
thermistor (black) wires inside the switch box.
6 Cut the accompanying sealing material along the slit. Stick each piece on top
of the sealing material that is attached to the bushing, in order to seal the gap
around the CO₂ sensor wire.
7 Bundle the excess CO₂ sensor wire together with the damper switch (red) and
thermistor (black) wires from the inside of the unit with the accompanying
clamp.
8 Cut off the excess part of the clamp.
NOTICE
To install the heat exchanger rail correctly, the wire MUST be clamped.
NOTICE
When bundling the wires, make sure to open the control box completely.
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.
c
ON OFF
f
24:00
17 Configuration
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"To remove the
h
Installer and user reference guide
93