80
7-3.
Hydro Unit Control
10) Control of limit of heat pump operation (Tempo1, 2)
When the peak period of electric power charge is set due to the contract or other conditions, you can limit heat pump
operation and give priority to boiler operation using an external input signal.
(This control functions only during the period the signal is input.)
• Connect its connection cable to the CN21 I/P7 port on the PC board (MCC-1755) of the hydro unit.
Non-voltage contacts
10-1)Setting the control method
Select an operation mode by setting DN_B6.
• DN_B6 = “1” (Tempo1): Hot water cylinder heater = OFF, backup heater = OFF (Built-in circulation pump is ON.)
• DN_B6 = “2” (Tempo2): Hot water cylinder heater = OFF, backup heater = OFF, heat pump = OFF, Built-in
circulation pump is stopped.
10-2)Control summary
When the TEMPO signal is input (the circuit is closed), the boiler signal is output regardless the outside temperature
and devices are turned off following the setting on DN_B6.
1. Basic operation: heating operation using the boiler.
2. Switching to hot water supply: the water circuit is switched to the hot water supply side as the unit detect
that TTW is less than 38°C.
3. Switching to heating: the water circuit is switched to the heating side as the unit detect that TTW is 52°C
or more, or 30 minutes has passed since operation started. Heating operation continues at least 30
minutes.
4. The LED on the PC board lights up when the input signal is ON.
Related DN
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
DN Setting item Default Setting value
B6 Setting the objects to control of I/P7, 8
0: I/P7 ··· Emergency Shutdown input
I/P8 ··· None
1: I/P7 ··· TEMPO1, I/P8 ··· None
2: I/P7 ··· TEMPO2, I/P8 ··· None
To Next Page
Loading...
