
7.2.5.4 HP unit controlled based on Buffer tank temperature
and Room air temperature
In order to reach the Buffer tank set point, compressor frequency shall be controlled so that Outgoing water
temperature can reach the maximum temperature in Heating mode (60°C) or minimum temperature in Cooling
mode (7°C).
And, the compressor is turned ON/OFF based on Buffer tank set point being reached as well.
Furthermore, external water pump in Zone1 and Zone2 can be turned ON/OFF.
In order to use this function, Par4220 shall be set as 4 (ON/OFF based on Room air temperature), and the
settings to enable the external water pump in each Zone by Par5148 and Par5149.
* Please refer to 7.5.7.1 and 7.5.7.2.
External pump OFF by reaching set Room air temperature
External pump OFF→ON control
When the Room air temperature sensor built-in the Remote controller detects that the Room air temperature has
reached the Room air set point, the external water pump in the applicable Zone shall be turned OFF.
Heating : Room air temp. Room air set point (Par0111, 0112, 1101, 1102, 1111, 1112,....1291, 1292)
Cooling : Room air temp. Room air set point (Par0111, 0112, 1101, 1111, 1112,....1291, 1292)
After the compressor has been turned OFF when the Room air temperature reaches the Room air set point, the
compressor will be turned ON when the following conditions are met.
However, it will not turn ON if it is OFF by the water set point or during the 3 minute standby period of the
compressor OFF→ON, even when turned ON by the Room air set point.
Heating : Room air temp. Room air set point (Par0111, 0112, 1111, 1112,....1291, 1292) - Hysteresis (Par4101)
Cooling : Room air temp. Room air set point (Par0111, 0112, 1111, 1112,....1291, 1292) + Hysteresis (Par4102)
Note: As for the Zone without Remote controller to detect the Room air temperature, it is not possible to turn the
compressor ON/OFF based on Room air temperature. Therefore, the compressor can be turned ON/OFF
only based on Outgoing water temperature.
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7. Unit Management
Содержание AEYC-0639U-CH
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