Daikin VAM Series Engineering Data page 49

EDMMT712101
Automatic nighttime free cooling function
Purpose • Functions
When the air conditioners are switched off at night, the room temperature raised by OA equipment is cooled by ventilation to reduce
the cooling load when the air conditioner is switched on the next morning
POINT
Nighttime free cooling only works during cooling operation under 1 group interlocking system with commercial multi air conditioners
(multi for buildings) /SkyAir. (It does not work under independent operation system.)
The operation lamp on the remote controller is OFF during the nighttime free cooling operation.
This function cannot be used together with direct duct connection setting.
This function cannot be set during zone interlock with indoor unit.
Operation pattern (operation image)
Outdoor temperature
40
30
Set temperature
20
Indoor temperature
OFF ON
OFF
22 ： 0 0 24 ： 0 0
Nighttime free cooling operation
<Unit operation>
The unit compares the indoor and outdoor temperatures after the air conditioner stops
for the night. if:
① The indoor temperature is higher than the temperature setting of the interlocked air
conditioner; and
② The outdoor temperature is lower than the indoor temperature, the operation
starts, and when the indoor temperature reaches the temperature setting of the air
conditioner, the operation stops.
Example of control wiring
P1 P2
P1 P2
Note) The maximum length of remote controller cord is up to 500m.
Remote controller
Switch number that needs to be changed for the system
Field settings using remote controller is required.
Field settings using remote controller
Setting descriptions
Nighttime free cooling function
ON/OFF and start time setting
Airflow rate setting for nighttime
free cooling
VAM-HVE/HVLT Series
OFF
→ N ext morning
(Time)
F1 F2
P1 P2
Heat Reclaim Ventilator Unit
Indoor unit
Mode Setting
No. switch No.
01
1 OFF
17 (27)
6 High
Operating conditions
<Start condition of nighttime
free cooling>
Air conditioner
Operation stops
Nighttime free
cooling ON/OFF
Start time setting
"ON: 2, 4, 6, 8
hours later"
Y
Elapsed
timeafter the air N
conditioner stops
> 2, 4, 6, 8
hours
Y
Temperature monitor
(5 minutes)
N
Indoor
temperature >
Temperature setting
+2 & Indoor temperature
> Outdoor
temperature
Y
Fan operation
(Fan speed: High,
Ultra high)
Setting position
02 03
ON•2hours ON•4 hours ON•6 hours
Ultra high —
Control System
<Stop condition of nighttime
free cooling>
Air
conditioner
starts operation
or Elapsed time after N
the temperature
monitor operation
starts > 60
hours
N
Y
To normal operation
Temperature monitor
standby
(for 60 minutes including
fan operation)
Indoor
temperature
≦ Temperature setting
or Indoor temperature ≦
N
Outdoor temperature
or Elapsed time after the
fan operation starts > 60
minutes
Y
Fan OFF
Factory default setting
04 05
ON•8 hours
— —
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