5-2-3 Major functions
Description of the input/output functions of the control unit
Classification Item Type Function
INPUT
Cold/Hot water
selection switch
TACT S/W Switch to select cold or hot water
Hot water
temperature sensor
Thermistor
Temperature sensor of the hot
water tank
Cold/Hot water
temperature sensor
Thermistor
Temperature sensor of the cold
water tank
Water level sensor REED LEVEL sensor
Detects low and high water level.
Water overflow
sensor
Overflow sensor Detects overflow of water.
Auxiliary memory
device
EEPROM
Inputs power failure compensation
function.
OUTPUT
FND indication part
Hot water LED
Displays the temperature
(60°C - 93°C) and selection.
Cold water
temperature LED
Displays the temperature
(4.5°C - 17°C) and selection.
Water heater
Heater Heats water.
Cold water
compressor
Compressor Cools water.
Feed water valve FEED V/V A feed water inlet valve
NOS valve NOS V/V A safety shut-off valve
Water overflow
sensor
Overflow sensor Output for water overflow sensor
Auxiliary memory
device
EEPROM
Outputs power failure
compensation function.
Power on sensor
1. When the power is connected to the product, it detects and displays the status on the FND.
2. When the power is connected after installation, the FND is turned on according to the sensor
condition, with the output in waiting mode.
3. FND display status (The initial power is on)
1) Hot water LED: The EEPROM is checked and the set value operates.
2) Cold water LED: The EEPROM is checked and the set value operates.
How water control function (Heater control)
1. When the hot water selection switch is on, the heater is controlled according to the water level and
hot water temperature.
1) Heater-on temperature: 88°C (19.833kΩ) or lower
2) Heater-off temperature: 93°C (16.845kΩ) or higher
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