BC-HM VI.76.W3.02 © Danfoss 11/96 1
Instruction ECL 9750
(This instruction apply to software
generation 00.2→ - see P0.1)
Digital settings ...........................10 - 20
- Display, switch and (+), (-) and SET
keys
- Position selection
- Value changing
- Value presetting
- Row 0 - Pumps and valve status
- Row 1 - Outdoor temperature
- Row 2 - Boiler circuit
- Row 3 - Mixing circuit
- Row 4 - Hot water service circuit
- Row 5 - Room temperature
- Row 6 - Return temperature
- Row 7 - System time constants
- Row 8 - Diverse function selection
- Row 9 - Diverse settings
Mounting and dismantling ........21 - 22
Time control ......................................23
Contents
System examples................................2
Electrical diagrams ............................. 3
Electrical connections...................4 - 5
- connections (230 V a.c .)
- connection of temperature sensors
Master/slave units............................... 5
Control settings .............................6 - 8
User settings
......................................... 6
a) program clock
b) display
c) temperature setting
d) function switch
Potentiometer settings
.....................7 - 8
f) and g) slope of heat curves
h) night setback
i) hot water service temperature
Function testing .................................. 9
- Status and temperature reading
- Regulation activity
- Testing of sensors
- Manual valve control
087R9453
087R9453
2 VI.76.W3.02 © Danfoss 11/96 BC-HM
Principle 1
Principle 2
Principle 3
BC-HM VI.76.W3.02 © Danfoss 11/96 3
Wiring for principle 1
Wiring for principle 2 and 3
4 VI.76.W3.02 © Danfoss 11/96 BC-HM
Terminal Load
Phase (L) 14 -
Neutral (N) 13 -
Circulation pump
18 8 (2) A 250 V a.c
Reversible gearmotor AMV, AMB
close 16 8 (2) A 250 V a.c.
open 17 8 (2) A 250 V a.c.
Feed pump or distribution valve
/ 20 8 (2) A 250 V a.c.
Burner (stage 2)
Burner (stage 1)
Electrical connections
Electrical connections to the controller
are made using terminal boards with
screw terminals.
Up to 3 × 1.5 mm
2
or corresponding can
be connected to each terminal. The
terminals are coded so that units on
mains voltage cannot be connected on
the sensor side.
Cable cross-section: 0.75 - 1.5 mm
2
Max. length: 50 m
Connection of temperature sensors, etc. - safety voltage (terminals 1 - 12)
The installation of sensors and remote controls is described in the associated
product instructions.
ECL 9750 must be connected to the following sensors:
230 V a.c. connections (terminals 13 - 24)
Type Klemme
Outdoor temperature sensor ESMT 11 - 12
Flow temperature sensor (mixing circuit) ESMA/C/U 10 - 11
Boiler sensor ESMA/C/U 8 - 9
Hot water service sensor ESMB/U 7 - 9
ECL 9750 is now able to control the hot
water service temperature and control
the flow temperature in both heating
circuits, in relation to the outdoor
temperature.
BC-HM VI.76.W3.02 © Danfoss 11/96 5
Type Terminal
Return temperature sensor ESMA/C/U 4 - 6
Remote control unit with built-in
ESMF 3 - 4
room sensor
Room temperature sensor ESMR 4 - 5
Control panel ECA 9020 with clock,
optimizer and room sensor. The control
panel will also show actual and
ECA 9020 1 - 2
calculated system temperatures.
In addition, the following sensors and
remote control units can be connected:
Cable cross-section: minimum 0.4 mm
2
Max. length: 50 m
Note
Cable resistance might produce an
incorrect measurement. A resistance of
4 ohm corresponds to a deviation of 1
degree.
Master/slave units
ECL 9750 can be connected to other
ECL controls (the number of units
depends on the type).
Further information is contained in the
instruction on master/slave units.
6 VI.76.W3.02 © Danfoss 11/96 BC-HM
Control settings
User settings
a) Program clock (analog or digital)
b) Display
c) Temperature setting
d) Function switch
e) User instructions
a) Program clock
The program clockis must be set in the
required normal and reduced
temperature periods by pushing riders for
reduced temperature setting towards the
center of the clock.
b) Display
On turning the switch concealed behind
the cover plate, the display will show the
operating condition and system
temperature (see function testing and
installer settings).
c) Temperature setting
The function of this knob depends on the
setting in P8.4 (see section on digital
settings). Selection can be made
between weather compensation and
adaptive reference room control in P8.4.
Weather compensation
The flow temperature in both boiler
circuit and mixing circuit can be
increased and decreased (parallel-
displaced) by turning the knob. Turning
towards +8 increases the flow
temperature.
Since the parallel displacement depends
on the slope of the heat curve, the
change can be different in the two
heating circuits.
With ESMR/F connected, the flow
temperature is reduced when the set
max. room temperature is exceeded.
The value is factory-set at 22 °C, but
can be changed in P5.2 (see digital
settings). The amplification factor can be
changed in P9.2.
Adaptive reference room control
The heat curve is automatically adapted
to the heat requirement. The room
temperature can be increased or
decreased with knob c).
The knob must be turned towards +8 if
the room temperature is too low. The
room temperature setting range is
factory-set at 22 ±8°C. The knob mid-
point can be set in P5.2 (see digital
settings).
The amplification factor can be changed
in P9.2.
d) Function switch
Burner and circulation pumps
stopped and valve in mixing circuit
closed, but with system frost-
protected. Hot water service
heating still possible.
Time program overridden and
constant control in accordance with
reduced temperature.
Automatic changeover between
normal and reduced temperature
as set on clock.
Time program overridden and
constant control in accordance with
normal temperature.
Manual operation
Burner and all circulation pumps
constantly cut in. All control
functions off and burner controlled
exclusively by boiler thermostat.
Valve can be controlled manually.
>|< Heating system regulated in
accordance with preset values. All
installer settings (under cover
plate) overridden. Preset values
are given in the section “Installer
settings” in the column marked >|<.
The best heating economy can be
achieved at the lowest possible flow
temperature and by using radiator
thermostats.
BC-HM VI.76.W3.02 © Danfoss 11/96 7
f) and g) Setting of heat curve slope
(boiler and mixing circuits)
The slope of the heat curve in boiler
circuit and mixing circuit can be set
independently of each other and in the
range 0.2 - 3.4. The heat curve factory
setting is 1.8.
If a satisfactory room temperature
cannot be obtained when the outdoor
temperature is less than +5 °C, the
slope can be increased by turning knob
f) or g). When the outdoor temperature
is more than +5 °C, the heat curve can
be parallel-displaced using knob c).
Potentiometer settings
f) Heat curve slope in boiler circuit
g) Heat curve slope in mixing circuit
h) Night setback level
i) Hot water service temperature
Outdoor- Radiator Floor heating
temperature* (80 °C) (55 °C)
–25 °C 1.2 0.7
–15 °C 1.6 0.9
–10 °C 1.8 1.0
Examples of heat curve settings
*Outdoor temperature for sizing. Normally the lowest
occurring outdoor temperature of the heating season
is used.
8 VI.76.W3.02 © Danfoss 11/96 BC-HM
The sinking of room temperature in the
reduced period is shown in the above
figure. Different settings are given
(–2, –4, –6, –8 and AUTO).
If no room sensor is used, the control
calculates the parallel displacement to
give the set room temperature setback.
i) Setting the hot water service
temperature
The hot water service temperature can
be set with potentiometer i).
The basic setting is 50 °C.
h) Setting the night setback level
The night setback level can be set at a
fixed value (0 - 8) or at an outdoor-
temperature-dependent value (AUTO).
The basic setting for the reduced
temperature is 5. Each graduation on the
scale corresponds to about 1 degree in
the room.
Night setback
BC-HM VI.76.W3.02 © Danfoss 11/96 9
Function testing
Status and temperature reading
Setting switch
on positions 0 - 9
enables the display to show the heating
system temperature and the status of
burners, pump and valve.
Setting Information
0 Burner, pump and valve status
1 Outdoor temperature
2 Flow temperature in boiler circuit
(boiler temperature)
3 Flow temp. in mixing circuit
4 Hot water service temperature
5 Room temperature
6 Return temperature
7 None
8 None
9 None
Control activity
During normal operation, when the
function switch is in position
, or
the bars will light up when the valve
actuator receives pulses.
No bars Flow temperature within
neutral zone, and motor
receives no pulses. Valve
inactive.
▲ Motor receives pulses which
open the valve.
▼ Motor receives pulses which
close the valve.
Testing of sensors
The sensors can each be inspected by
reading off the measured temperature
(P0.0 - P9.0) and in each case
evaluating the result.
The normal measuring range is –60 °C
to +120 °C. Outside this range the
display becomes:
– – (2 horizontal bars) for
disconnected sensor
– – – (3 horizontal bars) for short-
circuited sensor.
Manual valve control
When testing or adjusting gearmotor
limit switches, the valve can be
controlled manually by setting the
function switch in position
.
The valve can be opened by turning
knob c) fully clockwise and closed by
turning the knob fully counterclockwise.
If the direction of rotation of the motor
does not correspond to the display
indication, the leads to the gearmotor
must be swapped over.
10 VI.76.W3.02 © Danfoss 11/96 BC-HM
Digital settings
Display, switch and (+), (–) and SET
keys
The switch, display, (+), (–) and SET
keys can be used to check and change
some of the control settings.
Each check and setting range has a
certain “position”. The table below
shows how to make the change
between different positions.
Values in the positions marked * cannot be changed. Positions marked # contain up to three different functions.
See section on value changing.
Position selection
- Switch is used when selecting
rows 0 - 9.
- (+) and (–) keys are for selecting
columns 0 - 5. However, access to
the positions in columns 4 - 5 can
only be gained by selecting P0.3 and
pressing SET for 5 seconds. Then,
P0.4 will be shown in the display and
all positions become accessible.
- When a particular position is
selected, the display shows
alternately the position number, e.g.
P1.2, and a particular value, say 18°C.
Note: Column 0 displays values only.
Value changing
1) Select the required position.
2) Press “SET” once - the display
flashes.
3) Change the value using keys (+) and
(–).
4) Press “SET” to store the value.
01 2 3 4 5
0 P0.0* P0.1* - - - -
1 P1.0* P1.1* P1.2 P1.3 P1.4 -
2 P2.0* P2.1* P2.2 - P2.4 P2.5
3 P3.0* P3.1* P3.2 P3.3 - -
4 P4.0* - P4.2 - P4.4 -
5 P5.0* - P5.2 - - -
6 P6.0* P6.1* - - P6.4 P6.5
7 - - - - P7.4 P7.5
8 - - P8.2# P8.3# P8.4# P8.5#
9 - - P9.2# P9.3# P9.4# P9.5#
Row
0 - 9
← (–) Column 0-5 (+) →
Note
Positions marked # contain up to three
different functions. The values are
changed by choosing one digit at a time.
Press SET and the digit furthest to the
right will begin to flash. The figure can
then be changed using keys (+) and (–).
When SET is pressed again, the middle
digit can be changed. One more press
on SET and the digit farthest to the left
can be changed. All changes can be
stored by pressing SET. The display will
then show a value and position number
alternately.
Value presetting
Factory setting
>|< Basic setting - when the control
function switch is set >|< is
overridden to the preset values, as
shown in the tables under >|<.
BC-HM VI.76.W3.02 © Danfoss 11/96 11
Row 0 - Status
Position Description
P0.0 Pumps and valve status
The operating condition of burners, regulating valve and pumps can be read in
the display as vertical bars when the function is ON.
P0.1 Software generation
Software generation is shown in the display
P0.3 Access to columns 4 - 5
Press SET for 5 seconds and P0.4 will flash. Columns 4 and 5 are now accessible.
Valve closes
Valve opens
Pumps
Stage 1
Stage 2
Hot water service
Row 1 - Outdoor temperature
Position Description
P1.0 Actual outdoor temperature
P1.1 Accumulated outdoor temperature
Used in connection with summer cut-out P1.2
The accumulation factor is set in P9.5
Position Setting of Range >|<
P1.2 Summer cut-out 10 - 30 °C 18 °C -
Setting of the outdoor temperature at which heating
is to be stopped. Account must be taken of the
heat accumulation capacity of the building. The
accumulation factor must be set in P9.5
P1.3 Starting point of heat curve in mixing circuit –9 to +9 0 0
The heat curve starting point can be increased or
decreased ±9 in relation to 20, at 20 °C outdoor
temperature.
P1.4 Blocking stage 2 when outdoor temperature –9 to +30 °C 30 °C 30 °C
is high
Setting of the outdoor temperature limit above
which stage 2 must not be allowed to cut in.
12 VI.76.W3.02 © Danfoss 11/96 BC-HM
Row 2 -Boiler circuit
Position Description
P2.0 Actual boiler temperature (flow temperature)
P2.1 Calculated boiler temperature
Boiler or flow temperature calculated from
heat curve.
Position Setting of Range >|<
P2.2 Maximum flow temperature in boiler circuit 30 - 90 °C 80 °C 80 °C
Setting of the highest permissible boiler or
flow temperature
P2.4 Minimum flow temperature in boiler circuit 10 - 90 °C 40 °C 40 °C
Setting of the lowest permissible boiler or flow
temperature. Always follow the instructions of
the boiler manufactorer.
P2.5 Boiler temperature differential 1 - 25 K 8 K –
Setting of boiler temperature differential. Always
follow the instructions of the boiler manufactorer.
Row 3 - Mixing circuit
Position Description
P3.0 Actual flow temperature in mixing circuit
P3.1 Calculated flow temperature in mixing circut
Flow temperature calculated from heat curve
Position Setting of Range >|<
P3.2 Maximum flow temperature in mixing circuit 30 - 90 °C 80 °C 80 °C
Setting of highest permissible flow temperature
P3.3 Minimum flow temperature in mixing circuit 10 - 90 °C 10 °C 10 °C
Setting of lowest permissible flow temperature
Række 4 - Hot water service circuit
Position Description
P4.0 Actual hot water service temperature
Position Setting of Range >|<
P4.2 Reduced hot water service temperature 10 - 90 °C 10 °C 10 °C
Setting of required hot water service temperature
during night setback of the hot water circuit.
P4.4 Hot water service temperature differential 1 - 25 K 6 K 6 K
Setting of difference between cut-in and cut-out
temperature for hot water service heating
BC-HM VI.76.W3.02 © Danfoss 11/96 13
Row 5 - Room temperature
Position Description
P5.0 Actual room temperature
Position Setting of Range >|<
P5.2 Maximum limitation - room temperature 10 - 30 °C 22 °C –
A) Setting of the temperature at which the room
compensation of flow temperature begins, when
ESMR/F is used and weather compensation with
limit function is selected in P8.4
B) Setting of parallel displacement knob mid-
position when adaptive reference room control
is selected in P8.4
Note: Using ESMF the limit can be displaced in
relation to the value in P5.2 by ±10 degrees
Row 6 - Return temperature
Position Description
P6.0 Actual return temperature
P6.1 Damped return temperature
Used in connection with return temperature limitation to obtain stable regulation.
The damping factor must be set in P9.5.
Position Setting of Range >|<
P6.4 Max./Min. return temperature limitation 20 → 90 °C –40 –40
Setting of the temperature at which return
temperature limitation is to start
Positive value (+) is max. limit
Negative value (–) is min. limit
P6.5 Influence of return temperature limitation –9 → +9 3 3
on flow temperature.
When the return temperature lies under or over
the set limit (P6.4), the boiler temperature is
increased or decreased. The value determines the
magnitude of change (amplification) and the sign
determines the direction.
Positive value (+) increases boiler temperature
Negative value (–) decreases boiler temperature
14 VI.76.W3.02 © Danfoss 11/96 BC-HM
Row 7 - System time constants
Position Setting of Range >|<
P7.4 System response time 15 sec-59 min 5 min -
Minimum cut-in/out delay between stage 1 and 2,
when the difference between wanted and actual
flow temperature is less than 20 K
The system response time is the time which
elapses from when the burner starts to when the
flow temperature begins to rise
Seconds are shown in the display as ss
Minutes are shown in the display as mm
P7.5 Minimum stage delay 15 sec-59 min 2 min -
Minimum cut-in/out delay between stage 1 and 2,
when the difference between wanted and actual
flow temperature is more than 20 K
The minimum stage delay is the least time which
must elapse when the fast cut-in or cut-out of
stages is required.
Seconds are shown in the display as ss
Minutes are shown in the display as mm
BC-HM VI.76.W3.02 © Danfoss 11/96 15
Row 8 - Diverse function selection
010
0
1
0
1
0
1
Position Description Range
P8.2
Hot water service charge pump/distribution valve 0 or 1
The function is possible only at pump control in the
boiler circuit - selected in P8.5
Systems with hot water service charge pump.
The boiler circuit pump is stopped by hot water
service demand.
Systems with distribution valve.
The boiler circuit pump runs when hot water service
is demanded.
Hot water service priority 0 or 1
The function affects the mixing valve only
Priority OFF
Simultaneous heating and hot water service.
The mixing valve operates during hot water service
demand. Note: The boiler temperature is increased
during hot water service demand and can cause high
radiator temperature.
Priority ON
The mixing valve is closed during hot water
service demand.
Pump stop during night setback 0 or 1
The function is possible only with pump at control in the boiler
circuit - selected in P8.5
Pump stop OFF
The boiler circuit pump runs when:
- P2.1 > 20 °C
- P1.0 < 2 °C
- Burner is ON
Pump stop ON
The boiler circuit pump stops during night setback,
but starts when there is a heat demand in the
radiator circuit.
Note: There will be a risk of frost damage in the
radiator circuit
16 VI.76.W3.02 © Danfoss 11/96 BC-HM
Row 8 (cont.) - Diverse function selection
Position Description Range
P8.3
Clock channel - boiler circuit 0 - 4
The figure gives the clock channel which must
control the boiler circuit
Clock channel - mixing circuit 0 - 4
The figure gives the clock channel which must
control the mixing circuit
Clock channel - hot water service channel 0 - 4
The figure gives the clock channel which must
control the hot water service circuit
x can give one of the following functions
0 = no time control of the circuit
1 = time control in relation to channel 1
(analog or digital channel 1 or
ECA 9020 channel 1)
2 = time control in relation to channel 2
(digital channel 2 or ECA 9020 channel 2)
3 = time control in relation to channel 3
(ECA 9020 channel 3 only)
4 = time control in relation to channel 4
(ECA 9020 channel 4 only)
If the function switch is set on >|< the three clock channels
are overriden to
x
321
x
x
000
BC-HM VI.76.W3.02 © Danfoss 11/96 17
Row 8 (cont.) - Diverse function selection
Position Description Range
P8.4
Function and influence of room sensor 0 or 1
(boiler circuit)
Max. room temperature limit
If ESMR/F is connected, the room temperature
maximum limitation is the temperature set in P5.2.
The influence of ESMR/F must be set in P9.2.
Adaptive reference room control
The function is based on room sensor ESMR/F in
the reference room. The heat curve is automatically
adapted to the heat demand. The room temperature
can be set with the ± knob c). The influence of
ESMR/F must be set in P9.2 and the mid-position
must be set in P5.2.
Function and influence of room sensor 0 or 1
(mixing circuit)
Max. room temperature limit
If ESMR/F is connected, the room temperature
maximum limitation is the temperature set in P5.2.
The influence of ESMR/F must be set in P9.2.
Adaptive reference room control
The function is based on room sensor ESMR/F in
the reference room. The heat curve is automatically
adapted to the heat demand. The room temperature
can be set with the ± knob d). The influence of
ESMR/F must be set in P9.2 and the mid-position
must be set in P5.2.
Total stop of burner during night setback 0 or 1
Total stop OFF
Minimum boiler temperature is maintained in
normal periods and in reduced periods
Total stop ON
Minimum boiler temperature is maintained only in
normal periods. Frost protection is active only for
the boiler, when
"Pump stop during night setback"
is
selected in P8.2. Risk of frost damage in the radiator
circuit
0
1
0
1
1
0
000
18 VI.76.W3.02 © Danfoss 11/96 BC-HM
Row 8 (cont.) - Diverse functions selections
Position Description Range
P8.5
Control of pump in boiler or mixing circuit 0 or 1
The controller can only control one pump. Select the circuit
with controlled pump.
Boiler circuit
Mixing circuit pump
Pump and valve exercise 0 or 1
Pump and valve exercise OFF
Pump and valve exercise ON
Pump and mixing valve are exercised in turn if there
has been no heat demand for 72 hours. The pump
and possibly the burner are stopped during valve
exercise and the valve is closed during pump exercise
Delayed pump start after night set back 0 or 1
The function is only active when the boiler circuit pump is
controlled by the controller - selected in P8.5.
Pump started at the same time as the burner
Pump started only when minimum boiler temperature
is reached (used to reduce condensation on boiler
restart)
011
0
1
1
0
1
0
BC-HM VI.76.W3.02 © Danfoss 11/96 19
Row 9 - Diverse settings
Position Setting of Range
P9.2
Amplification factor with room compensation in boiler circuit 0 - 9
Setting of the influence of room temperature on the
boiler circuit flow temperature.
Note: The heat curve slope has an influence on the
magnitude of the change.
Amplification factor with room compensation in 0 - 9
mixing circuit
Setting of the influence of room temperature on the
mixing circuit flow temperature.
Note: The heat curve slope has an influence on the
magnitude of the change.
Boiler operating factor 0 - 9
Setting of the temperature deviation between boiler and degrees
mixing circuits necessary to make the boiler-
follow function
P9.3
Boost factor (fast heating) in boiler circuit 0 - 9
Set the percentage by which the flow
temperature must be increased during the
first hour after night setback.
0 - 9 corresponds to 0 - 90% increase.
Boost factor (fast heating) in mixing circuit 0 - 9
Set the percentage by which the flow
temperature must be increased during the
first hour after night setback.
0 - 9 corresponds to 0 - 90% increase.
444
-22
2
2
4
4
4
20 VI.76.W3.02 © Danfoss 11/96 BC-HM
Row 9 (cont.) - Diverse settings
Position Setting of Range
P9.4
Minimum burner ON-time 0 - 9 min
Setting of required minimum burner ON-time.
The time must be set in minutes.
Neutral zone in mixing circuit 0 - 9 degrees
Setting of neutral zone for flow temperature
in mixing circuit. The valve motor receives no
regulation pulses in the neutral zone.
Sequence control 0 or 1
Setting of burner or boiler sequence
Automatic sequence change-over. Sequence
changes over so that operating time becomes the
same in both boilers.
No sequence change-over - burner stage 1 is
always cut in before stage 2.
P9.5
Accumulation factor for outdoor temperature 0 - 9
Setting of accumulation factor in connection with
heat accumulation capacity of the building. Used
only in connection with summer cut-out P1.2.
0 = buildings with low heat accumulation capacity
9 = buildings with high heat accumulation capacity
Damping factor for return temperature 0 - 9
Setting of return temperature signal damping
in connection with return limitation.
0 = min. damping
9 = max. damping
Addressing of slave control 0 - 9
Setting of slave control adress in connection with
master/slave combinations in systems with several
controllers.
0 = outdoor temperature signal transferred
from master to slave(s)
1 - 9 = outdoor temperature signal, references and
clock signal (ECA 9020) transferred via bus.
Note: Display switched off in master control.
130
0
0
3
5
0
5
1
055
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