Hydro Unit
Installation Manual
– 16 –
Additional Hydro Unit outputs
This unit has four output ports. They are
selectable by DN. Table1 shows the selectable
output functions and default settings.
Volt free contact – specification show below:
AC230 V; 0.5 A (maximum)
DC24 V; 1 A (maximum)
Minimum current; 10 mA
Default setting
O/P 1 (DN: 6CA) Alarm output
O/P 2 (DN: 6CC) Defrost operation output
O/P 3 (DN: 6CD) Boiler control output
O/P 4 (DN: 6CB) Compressor operation output
Selectable output items (DN: 6CA~6CD)
0 Alarm output
1 Compressor operation output
2 Defrost operation output
3 Boiler control output
4 Safety or protection control running
5 During backup heater running
6 During hot water cylinder heater running
7 Heating operation output
8 Cooling operation output
9 Hot water operation output
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
Selectable input items (DN: B6)
DN:
B6
CN21 Item
0
8-10 Emergency Shutdown input
9-10 None
1
8-10 TEMPO control input 1
9-10 None
2
8-10 TEMPO control input 2
9-10 None
3
8-10 Forcibly turn off the backup heater
9-10
Forcibly turn off the hot water tank
heater
4
8-10 Smart Grid network input 1
9-10 Smart Grid network input 2
I/P7 I/P8 Operation Mode
0 0 Restricted Operation
1 0 System OFF
0 1 Normal Operation
1 1 System Forced ON
▼Table1
▼Table2
CN22
6
5
4
3
2
1
MCC-1755
common line
common line
O/P 2
O/P 4
O/P 3
O/P 1
Locally procured
Hydro Unit sub PCB
0: Alarm output
Open: No alarm
Close: Alarm
1: Compressor operation output
Open: Compressor is stopping
Close: Compressor is operating
2: Defrost operation output
Open: Unit is not defrost operating
Close: Unit is defrost operating
3: Boiler control output
Open: Normal operation
Close: Boiler operation output
4: During safety or protection control running
Open: Normal operation
Close: Release control running
5: During backup heater running
Open: Backup heater not running
Close: Backup heater running
6: During hot water cylinder heater running
Open: Hot water cylinder heater not running
Close: Hot water cylinder heater running
7: Heating operation output
Open: Not heating operation
Close: Heating operation
(Include HP, Heater and thermo off.)
8: Cooling operation output
Open: Not cooling operation
Close: Cooling operation
(Include HP and thermo off.)
9: Hot water operation output
Open: Not hot water operation
Close: Hot water operation
(Include HP, Heater and thermo off.)
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
I/P1 & I/P2: Room thermostat input
• Setting: DN [6B3] = 1
• Non-voltage contacts
Thermostat operation
CN21
Heating Cooling
Reach Not reach Reach Not reach
1-5 (I/P1) open close - -
2-5 (I/P2) - - close open
I/P3: Hot water tank thermostat input
• This function is used, when the customer use the
local hot water tank.
• Setting: DN [6B2] = 1
• Non-voltage contacts
Open: Reached setting temperature
Close: Not reached setting temperature
I/P4: Heating/cooling mode switching input
• Non-voltage contact
Open: Heating mode
Close: Cooling mode
I/P5: Heating/cooling operation ON/OFF input
• Non-voltage contact
Open: Operation OFF (Remote controller OFF)
Close: Operation ON (Remote controller ON)
I/P6: Hot water operation ON/OFF input
• Non-voltage contact
Open: Operation OFF (Remote controller OFF)
Close: Operation ON (Remote controller ON)
I/P7 & I/P8: Connection to a Smart Grid network (SG
Ready)
• Non-voltage contact
• The operating mode is controlled through volt free
contacts incorporated into the energy meter.
• Setting: DN [B6] = 4
0: Open, 1: Close
I/P 4
CN21
1
2
3
4
5
6
7
8
9
10
I/P 3
I/P 2
I/P 1
I/P 8
I/P 7
I/P 6
I/P 5
MCC-1755
common
line
common
line
Hydro Unit sub PCB
Locally procured
31-EN
32-EN
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