81
7-3.
Hydro Unit Control
11) Connection to a Smart Grid network (SG ready)
The operating mode is controlled through volt free contacts incorporated into the energy meter.
• Connect its connection cable to CN21 port on the PC board of the hydro unit.
Optional inputs to Hydro Unit
This unit has eight input ports. 2 ports of them are selectable by DN. Table2 shows the selectable input functions and
default settings.
Non-voltage contacts
11-1)The Settings
I/P7 & I/P8: Connection to a Smart Grid network (SG Ready)
• Non-voltage contacts
• The operating mode is controlled through volt free contacts incorporated into the energy meter.
• Setting: DN_B6 = “4”
DN_6CE = “0”: HP and backup heaters ON when “System Forced ON” mode
DN_6CE = “1”: HP operation only when “System Forced ON” mode
DN_AC = “0~10”: Setting to increase the space heating set point temperature when “System Forced ON” mode
11-2)The operation mode and control summary
0: The terminals are opened , 1: The terminals are closed
Item Operation flow and applicable data, etc.
MCC-1755
I/P 4
common
line
CN21
1
2
3
4
5
6
7
8
9
10
Hydro Unit sub PCB
common
line
I/P 3
I/P 2
I/P 1
I/P 8
I/P 7
I/P 6
I/P 5
Locally procured
Input items (Default setting)
I/P 1 Room thermostat input for heating
I/P 2 Room thermostat input for cooling
I/P 3 Hot water tank thermostat input
I/P 4 Heating/cooling mode switching input
I/P 5 Heating/cooling operation ON/OFF
I/P 6 Hot water operation ON/OFF
I/P 7 (DN_B6) 0: Emergency shutdown input
I/P 8 (DN_B6) 0: None
I/P 7 I/P 8 Mode Control summary
0 0 Restricted Operation
• Normal operation but with maximum compressor frequency limited to
certain value (night time operation)
• Back up heater control is active
• Boiler output control active
1 0 System OFF
• The heat pump and electric heaters are FORCED OFF for a maximum of 2
hours during this period.
• The space heating and DHW set points will continue to be displayed on the
remote controller.
• System safety controls (e.g. freeze protection) will remain active.
• Boiler output control will remain active.
0 1 Normal Operation
• This signal is not a START signal – only a recommendation to start
• The heat pump and electric heaters are available to operate under normal
control if there is a heating or DHW demand
• There is no restriction on the compressor frequency – the compressor can
operate at maximum frequency if requested by the outdoor unit control
software
1 1 System Forced ON
• During this period the system is FORCED ON to allow the heat pump and
back up heater to operate
• The space heating set point temperature is increased during this period.
The temperature increase can be adjusted using DN_AC.
• If there is a DHW demand during this FORCED ON period then the DHW
set point is increased to the set point used for the DHW boost function
• The hydro unit back up heaters will continue to operate with a modified
control where by the ON/OFF heater delay will be removed
• All other controls will remain active (e.g. DN_22, DN_1A etc.)
* Backup heater is not energized during boiler output is ON.
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