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7-3.
Hydro Unit Control
Example of pump speed control (heating and hot water supply mode including defrost operation)
When the target flow rate is changed, pump speed changes slowly in actual working, it is because of considering for
noise by pump speed changing quickly.
3-2) Controlling the built-in circulation pump P1 during the hot water supply operation
You can change the action of the built-in circulation pump P1 during the hot water supply operation using DN_5A.
• DN_5A = “0” (Default): The pump stops as the HP for hot water supply stops.
• DN_5A = “1”: The pump is always energized.
3-3) Controlling the built-in circulation pump P1 during the heating operation
You can change the action of the built-in circulation pump P1 during the heating operation using DN_6D0.
• DN_6D0 = “0” (Default): The pump is always energized.
• DN_6D0 = “1”: The pump stops when To ≥ 20°C. (Practically the HP for heating is turned off.)
3-4) Synchronized external circulation pump P2
Pump type: DC motor, rated voltage 220-240 V, connectable directly up to 200W rated power output.
You can select whether the pump P2 is synchronized with the pump P1 using DN_6B5. The pump P2 is always
energized if the pump P2 is not synchronized.
• DN_6B5 = “0” (Default): Non-synchronous
NOTE:
2 zone temperature control by boiler with P1 OFF is required DN_6B5 OFF
3-5) Controlling the external circulation pump P2
You can change the action of the external circulation pump P2 during cooling operation by setting DN_64.
• DN_64 = “00” (Default): The pump is always energized.
• DN_64 = “01”: The pump is always stopped.
Item Operation flow and applicable data, etc.
Item Status
Target flow rate
Defrost
Heating
Hot water supply
Ambient temperature
FL_max
Heating target considered TO X°C
Heating target considered TO Y°C
Hot water supply target
FL_min
0 L/min
Compressor ON
Comp. OFF / Thermostat OFF
Operation STOP
Compressor ON
Comp. OFF / Heater operation
Operation STOP
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