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7-3.
Hydro Unit Control
3-6) Controlling the built-in circulation pump P1 during cooling operation controlled with the room temperature thermostat
or room temperature remote controller.
You can change the action of the built-in circulation pump P1 by setting DN_65.
• DN_65 = “00” (Default): The pump is always energized.
• DN_65 = “01”: The pump is stopped when the thermostat is turned off.
3-7) Interval operation of the pump P1 during thermostat off operation (For energy saving)
The pump of the hydro unit performs intermittent operation according to the outdoor temperature during thermostat
off (compressor off) operation.
NOTE:
When boiler is installed (DN_6B0 = “1”), do NOT set intermittent operation or do NOT set the valve of A (DN_BA)
lower than the Boiler-heat pump switching temperature (DN_23).
A, lower limit of To during the heating operation, must be higher than the Boiler-heat pump switching
temperature.
Because when To is lower than the Boiler-heat pump switching temperature, the boiler output is ON state. But
if the pump stops due to the intermittent operation, the boiler output is also turned OFF.
Related DN
Item Operation flow and applicable data, etc.
DN Setting item Default Setting value
5A Control of the pump P1 during the hot water supply operation
0: synchronized with
HP
1: Always energized
64 Control of the pump P2 during in cooling operation 0: Always ON 1: Always stopped
65
Control of the pump P1 while using the room temperature control
or room temperature thermostat
0: Always ON
1: Stopped when the
thermostat is OFF
9E Turn off the P1 when TO sensor detect over than this temperature 20°C 10 ~ 30°C
6E
Pump P1 restart diff TO sensor temperature, when turn off the P1
by to sensor detection.
2: 2K 1 ~ 5K
BA
intermittent operation at TO ≥ A°C (heating)
0: continuous operation
-5 ~ 20°C
BB
intermittent operation at TO < B°C (cooling)
0: continuous operation
25 ~ 35°C
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