Sentera Controls ECH-8-DM Service manual

ECH-8-DM CONTROLLER FOR WATER
HEATERS / COOLERS WITH
EC FAN
Mounting and operating instructions

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ECH-8-DM CONTROLLER FOR WATER
HEATERS / COOLERS WITH EC FAN
Table of contents
SAFETY AND PRECAUTIONS 3
PRODUCT DESCRIPTION 4
ARTICLE CODES 4
INTENDED AREA OF USE 4
TECHNICAL DATA 4
STANDARDS 4
OPERATIONAL DIAGRAMS 5
WIRING AND CONNECTIONS 6
MOUNTING INSTRUCTIONS IN STEPS 6
OPERATING INSTRUCTIONS 8
VERIFICATION OF INSTALLATION 9
TRANSPORT AND STORAGE 10
WARRANTY AND RESTRICTIONS 10
MAINTENANCE 10

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ECH-8-DM CONTROLLER FOR WATER
HEATERS / COOLERS WITH EC FAN
SAFETY AND PRECAUTIONS
Read all the information, the datasheet, Modbus map, mounting and operating
instructions and study the wiring and connection diagram before working with the
product. For personal and equipment safety, and for optimum product performance,
make sure you entirely understand the contents before installing, using or maintaining
this product.
For safety and licensing (CE) reasons, unauthorised conversion and/ or modifications
of the product are inadmissible.
e product should not be exposed to abnormal conditions, such as extreme
temperatures, direct sunlight or vibrations. Long-term exposure to chemical
vapours in high concentration can affect the product performance. Make sure the
work environment is as dry as possible; avoid condensation.
All installations shall comply with local health and safety regulations and local
electrical standards and approved codes. is product can only be installed by
an engineer or a technician who has expert knowledge of the product and safety
precautions.
Avoid contacts with energised electrical parts. Always disconnect the power
supply before connecting, servicing or repairing the product.
Always verify that you apply appropriate power supply to the product and use
appropriate wire size and characteristics. Make sure that all the screws and nuts
are well tightened and fuses (if any) are fitted well.
Recycling of equipment and packaging should be taken into consideration and these
should be disposed of in accordance with local and national legislation/regulations.
In case there are any questions that are not answered, please contact your
technical support or consult a professional.

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ECH-8-DM CONTROLLER FOR WATER
HEATERS / COOLERS WITH EC FAN
PRODUCT DESCRIPTION
e ECH series are controllers for water air coolers or hot water air heaters that
are equipped with EC fans. Typically, they are used to cool or to heat warehouses
and industrial areas. e temperature setpoint can be steplessly adjusted via the
potentiometer. It has an unregulated output (ON-OFF) to control a water valve or
electric heater. e EC fan speed can be manually selected via the rotary switch
with 7 positions (Automatic, 5 manual steps and OFF). In Automatic mode, EC fan
speed is regulated automatically based on the setpoint temperature. All settings can
be adjusted via Modbus RTU communication. In remote mode, the controller can be
overdriven by remote Master device.
ARTICLE CODES
Article code Supply voltage
ECH-8-DM 85 – 305 VAC / 50 – 60 Hz
INTENDED AREA OF USE
■Warehouse air coolers equipped with EC fan and water valve
■e ideal controller for hot water air heaters in warehouses, sheds/stables, etc.
■Temperature controlled ventilation systems
■For indoor use, surface wall mounted
TECHNICAL DATA
■Supply voltage: 85 - 305 VAC / 50 – 60 Hz
■Stepless analogue output in automatic mode: 0 – 6 (0 – 10) VDC / max. load 200 Ω
■Relay output for valve / heater control: supply voltage (Us) / Imax 10 A
■Heating/cooling mode with jumper setting
■Analogue output with jumper (0-6 / 0- 10 VDC) or Modbus setting
■Input for PT500 temperature sensor
■Control switch with 7 positions: Off position + hand set position 1 to 5 + Auto
mode
■Potentiometer for temperature setpoint (range: 5°C – 35°C)
■RGB LED for status indication
■Modbus RTU communication
■Plastic enclosure for wall fixing
■Protection class: IP54
■Operating ambient conditions:
►Temperature: -10—50 °C
►Rel. humidity: 5 – 90% rH, non-condensing
STANDARDS
■Low Voltage Directive 2014/35/EU
■Electromagnetic Compatibility (EMC) Directive 2014/30/EU
■RoHS Directive 2011/65/EU

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ECH-8-DM CONTROLLER FOR WATER
HEATERS / COOLERS WITH EC FAN
OPERATIONAL DIAGRAMS
Auto mode - heating
Unregulated output - water valve or heater control Analogue output - EC fan speed control
35 ° C 5 ° C
0,4 ° C
Valve / heater
output
Setpoint
Temperature
Ts [°C]
Measured
temperature
T [°C]
Us (230 VAC)
0 VAC
0
20
40
60
80
100
35 ° C 2 ° C 5 ° C
0,4 ° C
Analogue
output [%]
Setpoint
Temperature
Ts [°C]
Measured
temperature
T [°C]
Auto mode - cooling
Unregulated output - water valve control Analogue output - EC fan speed control
5 ° C 35 ° C
0,4 ° C
Valve
output
Setpoint
Temperature
Ts [°C]
Measured
temperature
T [°C]
Us (230 VAC)
0 VAC
Analogue
output [%]
Setpoint
Temperature
Ts [°C]
Measured
temperature
T [°C]
0
20
40
60
80
100
35 ° C 2 ° C 5 ° C
0.4
Manual mode
0 1 2 3 4 5
0
20
40
60
80
100
Analogue
output [%]
Switch position
Heating Cooling
T > Ts
Valve / heater output: 0 VAC
EC fan speed: minimum value
Valve / heater output: 230 VAC
EC fan speed: Acc. rotary
switch position
T < Ts
Valve / heater output: 230 VAC
EC fan speed: Acc. rotary
switch position
Valve / heater output: 0 VAC
EC fan speed: minimum value
T – measured temperature
Ts – temperature setpoint