Daikin VAM Series Engineering Data page 50

Control System
Stand-Alone 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
This is the nighttime free cooling operation function for independent operation system of Heat Reclaim Ventilator Unit. (Including
centralized zone interlock for VAM-H.)
Nighttime free cooling function works even for Heat Reclaim Ventilator Unit independent operation system by setting target
temperature for stand-alone nighttime free cooling during field setting.
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.
Operation pattern (operation image)
Outdoor temperature
40
30
20
Indoor temperature
OFF ON
22 ： 0 0 24 ： 0 0
Nighttime free cooling operation
<Unit operation>
The unit compares the indoor and outdoor temperatures after Heat Reclaim Ventilator
Unit stops for the night. if:
① The indoor temperature is higher than the temperature setting of Heat Reclaim
Ventilator Unit; 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
Heat Reclaim Ventilator Unit
P1 P2
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
Target temperature setting
for stand-alone nighttime free
cooling
48
Set temperature
OFF
→ N ext morning
(Time)
Setting
Mode
switch
No.
01 02
No.
ON•
1 OFF
2 hours
Ultra
17 (27)
6 High
high
7 18°C 19°C
Operating conditions
<Start condition of nighttime
free cooling>
Heat Reclaim
Ventilator Unit
Operation Stop
Nighttime free
cooling ON/OFF
Start time setting
"ON: 2, 4, 6, 8
hours later"
Y
Elapsed
time after the air
conditioner stops
> 2, 4, 6, 8
hours
Y
Temperature monitor
(5 minutes)
Indoor
temperature >
Temperature setting +2
& Indoor temperature >
Outdoor
temperature
Y
Fan operation
(Fan speed: High,
Ultra high)
Setting position
03 04 05 06 07
ON• ON• ON•
— —
4 hours 6 hours 8 hours
— — — — —
20°C 21°C 22°C 23°C 24°C
EDMMT712101
<Stop condition of nighttime
free cooling>
Heat
Reclaim Ventilator
Unit starts operation
Elapsed time after the
temperature monitor
operation starts >
60 hours
N
Y
To normal operation
N
Temperature monitor
standby
(for 60 minutes
including fan operation)
N
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
08 09 10 11 12
— — — — —
— — — — —
25°C 26°C 27°C 28°C 29°C
VAM-HVE/HVLT Series
N
13
—
—
30°C