67
7-2.
Operation Mode
and Control
Method
13) Night time low-noise operation
A night time low-noise operation reduces operation frequency and the number of outdoor fan rotations for a certain period
during night time as noise control for urban operation.
The night time low-noise operation is enabled / disabled by changing the remote controller DN_09.
<How to set> - Refer to “11. Night time Low-noise Setting” on page 166.
Select "Silent mode" in menu display, and set to "ON".
7-3.
Hydro Unit Control
1) Capacity control (compressor, high-temperature release, low-temperature release)
This unit controls the compressor frequency and heater output so that the water outlet temperature matches the remote
controller set temperature.
1-1) Compressor control
• Calculates the different between the remote controller set temperature (TSC_H, TSC_F) and the water outlet
temperature (Hot water supply: THO, Heating: TWO).
• Sets the Hz signal correction amount that determines the number of compressor rotations by the temperature
difference.
• Detects the number of compressor rotations.
• Compares the Hz signal correction amount and the current operation Hz, and changes the compressor output
according to the difference.
* The control details are the same for hot water supply, heating, and cooling.
Item Operation flow and applicable data, etc.
* When ambient temperature is very low, compressor frequency and fan rotations will get to high for prevention
the product damage.
401 601 801 1101
Heating /
Hot water
supply
Cooling
Heating /
Hot water
supply
Cooling
Heating /
Hot water
supply
Cooling
Heating /
Hot water
supply
Cooling
Compressor Hz 36.0 50.4 55.2 50.4 45.0 48.0 64.2 48.0
FAN rpm 320 400 320 400 410 540 410 540
Temperature settings
(TSC_H, TSC_F)
Hz signal correction
Number of compressor
rotation detection
Remote controller
Water outlet temperature
(THO, TWO)
Hydro unit
TSC_H-THO for hot water supply
TSC_F-TWO
for heating/cooling
Inverter output change
Hz signal correction ≤ Operation Hz
Number of compressor
rotation change
Compressor frequency changeable range 10 Hz to 80 Hz (401)
10 Hz to 99 Hz (601)
10 Hz to 89 Hz (801)
10 Hz to 99 Hz (1101)
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