Frequently Asked Questions - Danfoss ECL Comfort 110 User Manual, Installation & Maintenance

Frequently asked questions

The time shown in the display is one hour off?
See the daylight saving time changeover in line 7198.
The time shown in the display is not correct?
The internal clock may have been reset, if there has been a power break for more than 36
hours. Set time and date. See line 1000.
What does the symbol mean?
The flow temperature is under influence of room temperature limitation, return
temperature limitation, boost, ramping, heating cut-out, DHW priority etc.
The room temperature is too low?
Make sure that the radiator thermostats do not limit the room temperature. If you still
cannot obtain the desired room temperature by adjusting the radiator thermostats, the
flow temperature is too low. Increase the desired room temperature (line 3000). If this
does not help, adjust the heat curve / desired temperature (line 2000).
The room temperature is too high during setback periods?
Make sure that the min. flow temperature limitation is not too high. See line 2177.
The temperature is unstable?
• Check that the flow temperature sensor is correctly connected and in the right place.
• If the controller has a room temperature signal (line 3000), check that the Gain is not
too high.
• Adjust the control parameters (line 6000).
The controller does not operate and the control valve is closed?
• Check that the flow temperature sensor is measuring the correct value, see 'Daily use'.
• Check the influence from other measured temperatures ( ).
How to restore the factory settings?
See line 7600.
What does P and PI control mean?
P control: Proportional control.
By using a P control, the controller will change the flow temperature proportional to the
difference between a desired and an actual temperature, e.g. a room temperature.
A P control will always have an offset which not will disappear over time.
PI control: Proportional and Integrating control.
A PI control does the same as a P control, but the offset will disappear over time.
A long 'Intgr. time' will give a slow but stable control, and a short 'Intgr. time' will result
in a fast control but with a higher risk of oscillations.
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© Danfoss 05/2007 DH-SMT/DK
Definitions
Comfort operation
Normal temperature in the system controlled by the schedule. During heating the flow
temperature in the system is higher to maintain the desired room temperature. During
cooling the flow temperature in the system is lower to maintain the desired room
temperature.
Comfort temperature
Temperature maintained in the heating / DHW circuit during comfort periods.
Desired flow temperature
Temperature calculated by the controller on basis of the outdoor temperature and
influences from the room and / or return temperatures. This temperature is used as a
reference for the control.
Desired room temperature
Temperature which is set as the desired room temperature. The temperature can only be
controlled by the ECL Comfort controller if a room temperature sensor is installed.
If a sensor is not installed, the set desired room temperature however still influences the
flow temperature.
In both cases the room temperature in each room is typically controlled by radiator
thermostats / valves.
Desired temperature
Temperature based on a setting or a controller calculation.
DHW circuit
The circuit for heating the domestic hot water (DHW).
Factory settings
Settings stored in the controller to simplify the setup of your controller the first time.
Flow / DHW temperature
Temperature measured in the flow at any time.
Heating circuit
The circuit for heating the room / building.
Heat curve
A curve showing the relationship between actual outdoor temperature and required
flow temperature.
Humidity, relative
This value (stated in %) refers to the indoor moisture content compared to the max.
moisture content. The relative humidity is measured by the ECA 62 / 63.
VI.KT.G2.02
DH-SMT/DK © Danfoss 05/2007
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