About The Nighttime Free Cooling Operation - Daikin VAM350J7VEB Installer And User Reference Manual

c Sealing material
d Bush
e Switch box
f X14A connector
g Screw
1 Remove the screws of the switch box cover.
2 Open the switch box.
3 Follow the same path with the CO₂ sensor wire as the damper
switch (red) and thermistor (black) wires: through the bush
inside the unit and through the left bush in the switch box.
4 Firmly insert the CO₂ sensor wire into the X14A connector.
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 by following 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 edge 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.
To install the components
1 Close the switch box cover.
2 Install the components. Follow the reverse procedure of
remove the components" on
8.5.5 About the nighttime free cooling
operation
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
a
30
b
20
OFF ON
OFF
22:00 24:00
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
VAM350~2000J7VEB
Heat reclaim ventilation unit
4P487293-1 – 2017.08
page 36.
c
OFF
f
h
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, reevaluation takes place every
60 minutes.
NOTICE
The nighttime free cooling operation works when the heat
reclaim ventilation unit is off. Therefore, it is NOT possible
to stop the nighttime free cooling function.
With setting 17(27)‑1 you can set the number of hours that have to
pass before the conditions for the free cooling function are checked.
With setting 17(27)‑6 you can set if the fan runs in high or ultra high
mode during the free cooling.
With setting 17(27)‑7 you can set a temperature.
NOTICE
This function is NOT possible when the heat reclaim
ventilation unit is NOT linked to an air conditioner.
8.5.6 About the pre-cool and pre-heat function
When the pre‑cool/pre‑heat function is set, the heat reclaim
ventilation unit switches on at the configured time (30, 45, or 60
minutes) after the air conditioner starts cooling or heating. By
default, this function is off. To use this function, you have to set it
with the user interface of the air conditioner.
"To
If the air conditioner is restarted within 2 hours after it has been
stopped, this function is NOT started.
You can enable this function with setting 17(27)‑2.
With setting 17(27)‑3 and setting 17(27)‑9 you can set for how long
the start of the heat reclaim ventilation unit is delayed.
NOTICE
This function is NOT possible when there is direct duct
connection or when the heat reclaim ventilation unit is NOT
linked to an air conditioner.
8.5.7 About preventing a feeling of draft
When the heating is on in a setup with air conditioner and the fan is
turned off while the defrost operation is running, the fan of the heat
reclaim ventilation unit is set to low mode or even stopped to prevent
a feeling of draft.
You can set the mode of the fan with setting 17(27)‑5.
NOTICE
This function is NOT possible when the heat reclaim
ventilation unit is NOT linked to an air conditioner.
8.5.8 About 24-hour ventilation
When the user interface is switched off, 24-hour ventilation starts.
You can enable this function with setting 19(29)‑4. With that same
setting, you can set the fan speed.
8.5.9 About the ultra-low setting
If the amount of ventilation is too high, even in low mode, you can
have the fans work intermittently or at a very low speed with setting
19(29)‑1.
8 Configuration
Installer and user reference guide
37