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8-2.
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.
Maximum operation frequency 40.2 Hz (Hot water supply/Heating/Cooling)
Maximum fan tap 500 rpm (P805HR-E, P1105HR-E)
The night time low-noise operation is enabled / disabled by changing the remote controller FC_09.
<How to set> - Refer to “11. Night time Low-noise Setting” on page 139.
Select "Silent mode" in menu display, and set to "ON".
8-3.
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.
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 70 Hz (P805HR-E)
10 Hz to 90 Hz (P1105HR-E)
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