32
VI.KT.F2.02
© Danfoss 06/2008
DH-SMT/DK
DH-SMT/DK
VI.KT.F2.02
© Danfoss 06/2008
33
Checklist, electrical connections
Is the ECL Comfort controller ready for use?
Make sure that the correct power supply is connected to terminals 21 (Live)
and 20 (Neutral).
Check that the required controlled units (actuator, pump etc.) are connected
to the correct terminals.
Check that all sensors are connected to the correct terminals.
Switch on the power.
Choose manual operation as controller mode.
Check that valves open and close, and that required controlled units (pump
etc.) start and stop when operated manually.
Check that the temperatures shown in the display match the actual sensors.
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 DHW 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.
Frequently asked questions
