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MIW-ECH-8-DM-EN-000 - 22 / 08 / 2022
9 - 10
ECH-8-DM
CONTROLLER FOR WATER
HEATERS / COOLERS WITH EC FAN
3.2
Automatic mode
When Auto mode has been selected, the controller changes the five speeds
automatically according to the setpoint temperature selected via the
temperature potentiometer (
Fig. 6
).
Fig. 6 Automatic mode
35 °C
5 °C
20 °C
0
1
2
3
4
5
A
35 °C
5 °C
20 °C
0
1
2
3
4
5
A
3.3
Remote mode
Remote mode turns off all user interfaces except Modbus RTU
communication. After the remote mode is selected (holding register 20),
LED, analogue and unregulated output states are controlled by a Modbus
master device via holding registers 21-24.
If the Modbus safety timeout register (Holding register 8) is not 0, it means
the Modbus safety timeout is set. Therefore, when the time runs out due to
no Modbus communication, the analogue output value will be “position 1”
value (holding register 12). After Modbus communication is recovered, the
analogue output value will follow again the sensor settings.
VERIFICATION OF INSTALLATION
ATTENTION
Use only tools and equipment with non-conducting handles when working on
electrical devices.
Safe operation depends on proper installation. Before start up, ensure the following:
■
The mains supply is connected correctly.
■
The speed regulator must be properly earth protected.
■
During operation, the unit must be closed.
■
Protection is provided against electrical shocks.
■
The cables are the appropriate size and fuse-protected.
■
There is sufficient air flow around the unit.
Verificationofoperation:
■
Switch ON the mains supply.
■
Set the temperature to the minimum position (5 °C).
■
The connected fan must stop – (if the ambient temperature is higher than the
selected setpoint value).
■
The valve/heater must be closed.
■
Set the temperature setpoint to the maximum position (35 °C).
■
The connected fans must run at max speed (6 VDC) – (if the measured temperature
is below the setpoint value).
■
The valve/heater must be open (230 VAC).
If the unit does not work according to the instructions, the wiring connections and
settings need to be checked
.
