Danfoss ECL Comfort 110 User manual

Operating Guide
ECL Comfort 110, application 116
(valid as of software version 1.08)
English version
www.danfoss.com

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How to navigate?
Safety Note
To avoid injury of persons and damages to the device, it is absolutely necessary to read and
observe these instructions carefully. The warning sign is used to emphasize special conditions
that should be taken into consideration.
This symbol indicates that this particular piece of information should be read with
special attention.
Adjust temperatures and values.
Switch between menu lines.
Select / return.
2 sec.
Return to daily user menu.
What do the symbols mean?
Mode COMFORT<
Temp. 48@½1000
The desired flow temperature is influenced by for example return temperature.
The actuator closes the control valve.
The actuator opens the control valve.
The actuator does not activate the valve.
The pump is ON.
The pump is OFF.
The controller is in setback mode.
The controller is in pre-setback mode (the symbol is blinking).
The controller is in comfort mode.
The controller is in pre-comfort mode (the symbol is blinking).

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Table of contents
Table of contents Line Page
Constant temperature control of domestic hot-water systems (DHW)
User guide, installation & maintenance
Introduction 5
Settings overview 6
Daily use 7
Temperatures 7
Select control mode 8
Set your personal schedule 8
Maintenance 10
Date - time 1000 10
Flow temp. (flow temperature control) 2000 10
Temp. min. (flow temp. limit, min.) 2177 10
Temp. max. (flow temp. limit, max.) 2178 10
Return T limit (return temp. limitation) 4000 11
Limit (return temp. limitation) 4030 11
Gain - max. (return temp. limitation - max. influence) 4035 12
Gain - min. (return temp. limitation - min. influence) 4036 12
Intgr. time (time constant for return temp. limitation) 4037 13
Control param. (control parameters) 6000 14
Auto tuning 6173 14
Motor prot. (motor protection) 6174 15
Xp1 at 65 C (proportional band) 6184 15
Xp2 at 90 C (proportional band) 6129 15
Tn (integration time constant) 6185 16
Tn - idle (integration time constant) 6096 16
M1 run (running time of the motorized control valve) 6186 16
Nz (neutral zone) 6187 17
Open time 6094 18
Close time 6095 18
S2 idle 6097 18

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Table of contents
Application 7000 19
P1 exercise (pump exercise) 7022 19
M1 exercise (valve exercise) 7023 19
P1 frost T (frost protection) 7077 19
P1 heat T (heat demand) 7078 19
Standby T (standby temperature) 7093 20
Ext. (external override) 7141 20
Min. on time (min. activation time gear motor) 7189 20
Daylight (daylight saving time changeover) 7198 21
ECL address (master / slave address) 7199 21
Type 7600 22
Service 8000 23
Code no. 8300 23
Ver. (version no.) 8301 23
Backlight (display brightness) 8310 23
Contrast (display contrast) 8311 23
Language 8315 24
MOD address (MODBUS address) 8320 24
Installation 25
Mounting the ECL Comfort controller 25
Electrical connections - 230 V a.c. - in general 26
Electrical connections - 24 V a.c. - in general 27
Connecting the temperature sensors and the ECL BUS 28
Connecting the flow switch (FS) 28
How to identify your system type 29
Adapting the ECL Comfort 110 controller 31
Manual control 32
Placing the temperature sensors 33
Checklist, electrical connections 34
Frequently asked questions 35
Definitions 36

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Introduction
How to use this guide
The instructions is divided into six parts:
• Introduction
• Settings overview
• Daily use
• Maintenance
• Installation
• Check
Basic principles of application 116 for ECL Comfort 110
If the measured flow (DHW) temperature (S3) is lower than the desired DHW
temperature, the motorized control valve (M1) is opened gradually and vice versa.
The return temperature (S4) to the district heating supply should not be too high. If so,
the desired flow temperature can be adjusted (typically to a lower value) thus resulting
in a gradual closing of the motorized control valve, i.e. the return temperature will
decrease.
The circulation pump, P1, is ON when the desired flow temperature is higher than 20 °C
(factory setting) or the actual flow temperature (S3) is below 10 °C (factory setting).
Furthermore, a flow switch (FS) signal (terminals 11 + 12) can be applied in order to heat
the DHW separately on DHW demand (DHW tapping, DHW draw-off).
If a supply temperature sensor S2 is connected, the proportional band Xp is adapted
to the actual temperature in order to avoid control instability. In addition, an idle
temperature for the supply temperature can be maintained to minimize the heat-up
time for the DHW.
° C
S3
FS Time
°C (degrees Celsius) is an absolute temperature whereas K (Kelvin) is a relative temperature.

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Settings overview
Line Page Factory
setting
Your
setting
Temp. min. (flow temp. limit, min.) 2177 10
Temp. max. (flow temp. limit, max.) 2178 10
Limit (return temp. limitation) 4030 11
Gain - max. (return temp. limitation - max. influence) 4035 12
Gain - min. (return temp. limitation - min. influence) 4036 12
Intgr. time (time constant for return temp. limitation) 4037 13
Auto tuning 6173 14
Motor prot. (motor protection) 6174 15
Xp1 at 65 C (proportional band) 6184 15
Xp2 at 90 C (proportional band) 6129 15
Tn (integration time constant) 6185 16
Tn - idle (integration time constant) 6096 16
M1 run (running time of the motorized control valve) 6186 16
Nz (neutral zone) 6187 17
Open time 6094 18
Close time 6095 18
S2 idle 6097 18
P1 exercise (pump exercise) 7022 19
M1 exercise (valve exercise) 7023 19
P1 frost T (frost protection) 7077 19
P1 heat T (heat demand) 7078 19
Standby T (standby temperature) 7093 20
Ext. (external override) 7141 20
Min. on time (min. activation time gear motor) 7189 20
Daylight (daylight saving time changeover) 7198 21
ECL address (master / slave address) 7199 21
Type 7600 22
Code no. 8300 23
Ver. (version no.) 8301 23
Backlight (display brightness) 8310 23
Contrast (display contrast) 8311 23
Language 8315 24
MOD address (MODBUS address) 8320 24
10 °C
90 °C
50 °C
0.0
0.0
25 s
OFF
OFF
50 K
120 K
20 s
120 s
15 s
3 K
OFF
2.0 s
OFF
OFF
OFF
10 °C
20 °C
10 °C
OFF
3
ON
15
116
XXXX
XXXX
16
10
English
5
!

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Daily use
Temperatures
Push any button to switch on the backlight.
Mode COMFORT
Temp. 48@½
Setting the desired DHW temperature
Change the desired temperature.
Temperature overview
2 sec.
Push the button to see the sensor (S3, S4, S2) temperatures, calculated Xp and flow switch
(FS) status.
Change between the temperature displays:
S3:
Actual flow temperature
Desired flow temperature
S3 des. T 48@
S3 act. T 49@
S4:
Actual return temperature
Desired return temperature limitation
S4 lim. T 50@
S4 act. T 24@
Calculated Xp, based on S2 temperature
Actual supply temperature
S2 act. T 78@
Xp actual 87K
Flow switch (FS) not activated = OFF
Flow switch (FS) activated = ON
FS status OFF
Push to exit ‘Temperature overview’.
If the temperature value is displayed as
"- -" the sensor in question is not connected.
"- - -" the sensor is short-circuited.

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Daily use
Select control mode
During scheduled operation (AUTO), the symbols will show you the control mode.
Wednesday
Mode COMFORT<
Change the mode (AUTO, COMFORT, SETBACK, or STANDBY).
Set your personal schedule
It is only possible to set the personal schedules if the ECL Comfort 110 controller has a built-in
ECA 110 timer program.
04-01-12 8:32
Wednesday <
This display will show the current day and time.
Choose the day for which you wish to change the settings.
Today’s schedule
The first display will show you the start of the first comfort period (‘Start1’). See or change
the start of this period.
The first bar will blink.
Wed ]]]][!]]]!!]
Start1 09:00
See or change the end (‘Stop1’) of the first comfort period.

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Daily use
The next bar will blink.
Wed ]]]][!{]]!!]
Stop1 12:00
See or change the start (‘Start2’) of the next comfort period.
Wed ]]]][!{]]!!]
Start2 18:00
See or change the next start / stop periods, if necessary.
Wed ]]]][!{]]!!]
Stop2 22:00
฀฀
The schedule has always two comfort periods a day. The start and stop times can be set in
half-hourly intervals (30 min.).
To arrange only one comfort period on a day: Set Start2 and Stop2 times to the same time
value.

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Maintenance
2 sec.
Enter the maintenance menus.
Date - time 1000
It is only necessary to set the correct date and time in connection with the first use of the
ECL Comfort 110 controller or after a power break of more than 36 hours (see the chapter on
Adapting the ECL Comfort 110 controller).
Flow temp. (flow temperature control) 2000
Temp. min. (flow temp. limit, min.) 2177
Setting range Factory setting
-20 ... 110 °C 10 °C
Set the allowed min. flow temperature for your system. Adjust the factory setting, if
required.
Temp. max. (flow temp. limit, max.) 2178
Setting range Factory setting
10 ... 150 °C 90 °C
Set the allowed max. flow temperature for your system. Adjust the factory setting, if
required.
The setting for ‘Temp. max.’ has higher priority than ‘Temp. min.’.

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Maintenance
The controller automatically changes the desired flow temperature to obtain an accept-
able return temperature when the return temperature falls below or gets higher than the
set limit.
Influence
‘Gain - min.’ > 0
‘Limit’
‘Gain max.’ > 0
Return temperature
‘Gain - max.’ < 0
‘Gain - min.’ < 0
This limitation is based on a PI regulation where P (Gain) responds quickly to deviations
and I (Intgr. time) responds slower and over time removes the small offsets between the
reference and actual measured values. This is done by changing the flow temperature
reference.
If the ‘Gain’ is too high and / or the ‘Intgr. time’ too low, there is a risk of unstable control.
Limit (return temp. limitation) 4030
Setting range Factory setting
10 ... 110 °C 50 °C
Set the return temperature you accept for the system.
Set the acceptable return temperature limit.
When the return temperature falls below or gets higher than the set value, the controller
automatically changes the desired flow temperature to obtain an acceptable return
temperature. The influence is set in lines 4035 and 4036.
A recommended setting value for ‘Limit’ in DHW systems with constant flow has the same
value as the desired DHW temperature.
This prevents that the return temperature limitation is activated when idle (no DHW tapping
/ DHW draw-off).
Return T limit (return temp. limitation) 4000

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Maintenance
Gain - max. (return temp. limitation - max. influence) 4035
Setting range Factory setting
-9.9 ... 9.9 0.0
Determines how much the flow(DHW) temperature will be influenced if the return temperature is
higher than the desired ‘Limit’ (line 4030) (P control).
Influence higher than 0:
The desired flow temperature is increased, when the return temperature gets higher
than the set limit.
Influence lower than 0:
The desired flow temperature is decreased, when the return temperature gets higher
than the set limit.
Example
The return limit is active above 50 °C.
The influence is set to -2.0.
The actual return temperature is 2 degrees too high.
Result:
The desired flow temperature is changed by -2.0 x 2 = -4.0 degrees.
Normally, the setting in line 4035 is lower than 0 in district heating systems to avoid a too
high return temperature.
Typically, the setting in line 4035 is 0 in boiler systems because a higher return temperature
is acceptable (see also line 4036).
Gain - min. (return temp. limitation - min. influence) 4036
Setting range Factory setting
-9.9 ... 9.9 0.0
Determines how much the flow temperature will be influenced if the return temperature is lower than
the desired ‘Limit’ (line 4030) (P control).
Influence higher than 0:
The desired flow temperature is increased, when the return temperature gets below the
set limit.
Influence lower than 0:
The desired flow temperature is decreased, when the return temperature gets below the
set limit.

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Maintenance
Example
The return limit is active below 50 °C.
The influence is set to -3.0.
The actual return temperature is 2 degrees too low.
Result:
The desired flow temperature is changed by -3.0 x 2 = -6.0 degrees.
Normally, the setting in line 4036 is 0 in district heating systems because a lower return
temperature is acceptable.
Typically, the setting in line 4036 is higher than 0 in boiler systems to avoid a too low return
temperature (see also line 4035).
If the return temperature measurement is used as thermometer function only, the settings
in lines 4035 and 4036 should be 0.0.
Intgr. time (time constant for return temp. limitation) 4037
Setting range Factory setting
OFF / 1 ... 50 s 25 s
Controls how fast the return temperature adapts to the desired return temperature (I control).
OFF: The control function is not influenced by the ‘Intgr. time’.
1: The desired temperature is adapted quickly.
50: The desired temperature is adapted slowly.

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Maintenance
Control param. (control parameters) 6000
Auto tuning 6173
Setting range Factory setting
ON / OFF OFF
Automatically determines the control parameters for the DHW control. Lines 6184, 6129, 6185, 6186 and
6187 do not need to be set, when using auto tuning.
OFF: Auto tuning is not activated.
ON: Auto tuning is activated.
The auto tuning function automatically determines the control parameters for
DHW control. Thus you do not need to set the lines 6184, 6129 and 6185, as they are
automatically set to the auto tuning function.
Auto tuning is typically used in connection with the installation of the controller, but it
can be activated when needed, e.g. for an extra check of the control parameters.
Before starting the auto tuning, the tapping (draw-off) flow should be adjusted to the
relevant value (see table below).
Recommended DHW tapping (DHW draw-off) load
No. of apartments Heat transfer (kW) Constant tapping load (l / min)
1-2 30-49 3 (or 1 tap 25% open)
3-9 50-79 6 (or 1 tap 50% open)
10-49 80-149 12 (or 1 tap 100% open)
50-129 150-249 18 (or 1 tap 100% + 1 tap 50% open)
130-210 250-350 24 (or 2 taps 100% open)
If possible, any additional DHW consumption should be avoided during the auto
tuning process. Should the tapping (draw-off) load vary too much, the auto tuning and
controller will return to the default settings.
Auto tuning is activated by setting the function to ON. When the auto tuning is ended,
the function is automatically converted to OFF (default setting). This will be indicated in
the display.
The auto tuning process takes up to 25 minutes.
The motor protection function (line 6174) has to be deactivated during auto tuning.
During auto tuning the circulation pump for tap water must be switched off. This is done
automatically if the pump is controlled by the ECL controller.
Auto tuning is only applicable in connection with valves that are approved for auto tuning,
i.e. the Danfoss types VB 2 and VM 2 with split characteristic.

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Maintenance
Motor prot. (motor protection) 6174
Setting range Factory setting
OFF / 10 ... 59 m OFF
Prevents the controller from unstable temperature control (and resulting actuator oscillations). This
can occur at very low load. The motor protection increases the lifetime of all involved components.
OFF: Motor protection is not activated.
10 ... 59: Motor protection is activated after the set activation delay.
Xp1 at 65 C (proportional band) 6184
Setting range Factory setting
1 ... 250 K 50 K
Set the desired proportional band when the supply temperature (S2) is 65 °C.
A higher value will result in a stable but slow control of the flow temperature.
Xp2 at 90 C (proportional band) 6129
Setting range Factory setting
1 ... 250 K 120 K
Set the desired proportional band when the supply temperature (S2) is 90°C.
A higher value will result in a stable but slow control of the flow temperature.
Xp is related to the supply temperature, S2. Typically, when the S2 temperature increases,
Xp must increase. If the S2 sensor is not connected, the Xp value will be constant and equal
Xp1.
65 90
Xp
Xp2
Xp1
S2 [o
C]

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Maintenance
Tn (integration time constant) 6185
Setting range Factory setting
5 ... 999 s 20 s
Set a high integration time constant to obtain a slow but stable reaction to deviations.
A low integration constant will make the controller react fast but with less stability.
Tn - idle (integration time constant) 6096
Setting range Factory setting
5 ... 999 s 120 s
When there is no DHW tapping (DHW draw-off), the saving temperature is slowly
controlled at either S3 or S2 (see also the setting in 6097).
Set a high integration time constant to obtain a slow control.
Set a low integration time constant for a fast control.
M1 run (running time of the motorized control valve) 6186
Setting range Factory setting
5 ... 250 s 15 s
‘M1 run’ is the time it takes the controlled unit to move from fully closed to fully open
position. Set the ‘M1 run’ according to the example.
How to calculate the running time of a motorized control valve
The running time of the motorized control valve is calculated using the following methods:
Seated valves
Running time = Valve stroke (mm) x actuator speed (sec. / mm)
Example: 5.0 mm x 15 sec. / mm = 75 sec.
Rotating valves
Running time = Turning degrees x actuator speed (sec. / degr.)
Example: 90 degr. x 2 sec. / degr. = 180 sec.

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Maintenance
Nz (neutral zone) 6187
Setting range Factory setting
1 ... 9 K 3 K
Set the acceptable flow temperature deviation.
Set the neutral zone to a high value if you can accept a high variation in flow
temperature. When the actual flow temperature is within the neutral zone, the controller
does not activate the motorized control valve.
The neutral zone is symmetrical around the desired flow temperature value, i.e. half the
value is above and half the value is below this temperature.
If you want to tune the PI regulation precisely, you can use the following
method:
• Set the ‘Tn’ (integration time constant line 6185) to its max. value (999 sec.).
• Decrease the value for the ‘Xp’ (proportional band line 6184) until the system starts
hunting with a constant amplitude (it might be necessary to force the system by setting
an extreme value).
• Find the critical time period on the temperature recording or use a stop watch.
Temp. Critical time period
Time
This time period will be characteristic for the system, and you can evaluate the settings from
this critical period.
‘Tn’ = 0.85 x critical time period
‘Xp’= 2.2 x proportional band value in the critical time period.
If the regulation seems to be too slow, you can decrease the proportional band value by
10%.

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Maintenance
Open time 6094
Setting range Factory setting
OFF, 0.1 . . . 20.0 s OFF
Commands the actuator to open the valve for the set period of time when a DHW
tapping (DHW draw-off) starts.
OFF: The flow switch (FS) function is disabled.
0.1 .... 20 s: Forced opening time.
If the flow switch (FS) function is chosen, the override function cannot be activated and the
setting in ‘Ext. (external override) in 7141 should be OFF.
Close time 6095
Setting range Factory setting
0.1 . . . 20.0 s 2.0 s
Commands the actuator to close the valve for the set period when a DHW tapping (DHW
draw-off) stops.
0.1 .... 20 s: Forced closing time.
S2 idle 6097
Setting range Factory setting
OFF / ON OFF
If there is no DHW tapping (DHW draw-off), the S2 or the S3 temperature can be
maintained depending on the chosen setting in 6094, ‘Open time’.
When the setting in 6094 is OFF, the S2 temperature is not maintained.
When a ‘forced opening time’ is chosen in 6094, the setting in 6097 results in the
following:
OFF: The S3 temperature is maintained (assuming that a DHW circulation is
present).
ON: The S2 temperature is maintained (assuming that a DHW circulation is not
present).

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Maintenance
P1 exercise (pump exercise) 7022
Setting range Factory setting
ON / OFF OFF
Exercises the pump to avoid blocking in periods without heat demand.
ON: The pump is switched ON for 1 minute every third day around noon.
OFF: The pump exercise is not active.
M1 exercise (valve exercise) 7023
Setting range Factory setting
ON / OFF OFF
Exercises the valve to avoid blocking in periods without heat demand.
ON: The valve receives a signal to open and close every third day around noon.
OFF: The valve exercise is not active.
P1 frost T (frost protection) 7077
Setting range Factory setting
OFF / -10 ... 20 °C 10 °C
When the DHW temperature is below the set temperature in ‘P1 frost T’, the controller automatically
switches ON the circulation pump to protect the system.
OFF: No frost protection.
-10 ... 20: The circulation pump is ON when the flow temperature (S3) is
below the set value.
P1 heat T (heat demand) 7078
Setting range Factory setting
-20 ... 50 °C 20 °C
When the desired flow temperature is above the set temperature in ‘P1 heat T’, the controller
automatically switches ON the circulation pump to meet the heat demand.
-20 ... 50: The circulation pump is ON above the set value.
Application 7000

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Maintenance
Standby T (standby temperature) 7093
Setting range Factory setting
5 ... 40 °C 10 °C
Set the desired flow temperature at standby.
5 ... 40: Desired standby flow temperature.
Ext. (external override) 7141
Setting range Factory setting
OFF / SETBACK / COMFORT OFF
Choose mode for ‘Ext.’ (external override).
The override can be activated for setback or comfort mode. For override, the controller
mode must be AUTO (scheduled operation).
OFF: The controller's schedule is not overridden.
SETBACK: The controller is in setback mode when terminals 11 and 12 are
short-circuited.
COMFORT: The controller is in comfort mode when terminals 11 and 12 are
short-circuited.
If the flow switch (FS) function is chosen in ‘Open time’ in 6094, the override function cannot
be activated and the setting in ‘Ext. (external override) in 7141 should be OFF.
Min. on time (min. activation time gear motor) 7189
Setting range Factory setting
2 ... 50 3
The min. pulse length in milliseconds for activation of the gear motor.
Setting Value x 20 ms
240 ms
10 200 ms
50 1000 ms