74
7-3.
Hydro Unit Control
4) Control by the flow sensor
Whether water flows or not is judged with the valve of water flow sensor.
Without water-flow determination from the flow sensor after the hot water supply operation, heating operation, or cooling
operation, The HP, backup heater and booster heater are not energized. Similarly, The “A01” error indication flashes if
the flow sensor judged that water does not flow.
The specification of the flow sensor is the same in 601 and 1101. The flow setting differs due to the specification of piping
in the hydro unit.
5) Mixing Valve control (2-temperature heating control)
To set different radiator unit supply temperatures or floor heating supply temperatures, the unit performs Mixing Valve
control.
When Mixing Valve "Yes" is selected, the unit controls Mixing Valve every 2 minutes (DN) based on the difference TSC_Δ
T between the Zone2 set temperature and TFI (floor inlet water temperature sensor) temperature as follows:
To enable 2 zone temperature control switch change DN_6BA to “1”.
NOTE:
The mixing valve will automatically be reset if 24 hours pass with the valve fully closed.
2 zone temperature control by boiler with P1 OFF is required DN_6B5 = “0”.
Related DN
6) Room temperature control
You can install a sub remote controller (separately purchased) in a room to control room temperature.
6-1) Installing the sub remote controller
• Wiring with the main unit (See the figure on the right): After detaching the front
panel, connect the sub remote controller to the right terminal on the main remote
controller, which is connected with the hydro unit. (No polarity)
• Place to install (inside a room): At the height of 100 cm - 150 cm on a wall
Opposite to the radiator or fan coil installed
No assignment when floor heating is used on the room.
6-2) Room temperature control settings
• Set one of remote controller as the header remote controller.
(Remote controller of Hydro unit is preset as Header.)
You can set “Header / Second” in “Initial setting” on the setting screen.
• Set DN_40 to “1” to control room temperature instead of water temperature.
• Set the “Temperature control” to “ON” in Initial setting MENU with the remote
controller to control room temperature.
Item Operation flow and applicable data, etc.
TSC_ΔT2 < TSC_ΔT-2 ≤ TSC_ΔT ≤ 2-2 > TSC_ΔT
Control value + 1 step (Open) ± 0 step - 2 step (Close)
Initial value Driving range 1 step Control cycle
0 0 - 24 3 WV move 3.75 degrees 2 min (DN)
DN Setting item Default Setting available range
0C Mixing Valve operation time 60 30 - 240 sec
59 Mixing Valve control time 2 30 sec, 1 - 30 min
Right terminal on the
main remote controller
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