Daikin VRV III Manual page 34

ED34-862
Energy Saving
By heat recovery operation
Approx. 20% reduction
of heating / cooling load
By setting to automatic
ventilation mode
Approx. 8% reduction
of heating / cooling load
By Precooling / heating operation
Approx. 2% reduction
of heating / cooling load
Total
30% reduction
of heating / cooling
load
Note:
The total heating / cooling load may vary depending on the climate or the other environmental conditions.
General Information
HRV unit recovers the thermal energy during cooling / heating operation of air conditioner.
HRV reduces the cooling / heating load drastically and enhances the heating / cooling
efficiency.
Exhaust Exhaust
Air Air
Outdoor
Air
Proper use of Heat recovery ventilation and normal ventilation saves energy.
When the cooling operation is required in winter, use of heat recovery ventilation is not
efficient because the outdoor air temperature is normally lower than that of the indoor.
Thus, the proper use of ventilation mode enhances the heating / cooling efficiency.
Automatic Ventilation mode changeover
Operation Sensor of ventilation
Difference between
indoor / outdoor temp.
Indoor temp. > Outdoor temp.
Cooling
Indoor temp. < Outdoor temp.
Indoor temp. > Outdoor temp.
Heating
Indoor temp. < Outdoor temp.
Refer to the CONTROL for the mode changeover.
Heat Recovery mode
Exhaust
Air
Outdoor
Air
Heat Exchanger Element
(Heat Recovery)
Normal (Bypass) mode
Exhaust
Air
Outdoor
Air
Heat Exchanger Element
(Heat Recovery)
The load is reduced at startup of the air conditioner by the following control.
Before the working hour, the room air is clean.
Therefore, the startup of HRV can be delayed.
Working hour starts
8:15
Air
conditioner
ON
HRV
Cooling / Heating
load is reduced
Reduction of
heating / cooling
load (%)
0%
Normal
operation
: http://splitoff.ru/tehn-doc.html
Heat Exchanger Element
(Heat Recovery)
Decision of mode
(Which is more
energy efficient?)
Normal ventilation (Bypass)
Heat recovery ventilation
Heat recovery ventilation
Normal ventilation (Bypass)
Return
Air
Supply
Air
(HC0231)
Return
Air
Supply
Air
(HC0232)
9:00
ON
30%
20%
HRV independent Interlocked
operation operation
Features
1
Return
Air
Supply
Air
(HC0230)
Automatic
Changeover
Working hour ends
18:00
OFF
OFF
(HC0233)
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