Resol HC User manual

*11201037* 11201037
Thank you for buying this RESOL product.
Please read this manual carefully to get the best performance from this unit.
Please keep this manual carefully.
HC Heating controller
www.resol.com
Manual
en
Mounting
Connection
Operation
Troubleshooting
Application examples
Manual for the
specialised craftsman

en
2
Description of symbols
Signal words describe the danger that may occur,
when it is not avoided.
• WARNING means that injury, possibly life-threat-
ening injury, can occur.
• ATTENTION means that damage to the appli-
ance can occur.
Information about the product
Proper usage
The controller is designed for use in heating systems
in compliance with the technical data specified in this
manual.
Improper use excludes all liability claims.
CE-Declaration of conformity
The product complies with the relevant di-
rectives and is therefore labelled with the
CE mark. The Declaration of Conformity
is available upon request, please contact
RESOL.
Note
Notes are indicated with an information
symbol.
Subject to technical change. Errors excepted.
ÎArrows indicate instruction steps that should be
carried out.
WARNING! Warnings are indicated with a warn-
ing triangle!
ÎThey contain information on
how to avoid the danger de-
scribed.
Note
Strong electromagnetic fields can impair the
function of the controller.
ÎMake sure the controller as well as the
system are not exposed to strong elec-
tromagnetic fields.
© 20121012_11201037_Heizungsregler_HC.monen.indd
Safety advice
Please pay attention to the following safety advice
in order to avoid danger and damage to people and
property.
Instructions
Attention must be paid to the valid local standards,
regulations and directives!
Target group
These instructions are exclusively addressed to au-
thorised skilled personnel.
Only qualified electricians should carry out electrical
works.
Initial installation must be effected by the system own-
er or qualified personnel named by the system owner.
Disposal
• Dispose of the packaging in an environmentally
sound manner.
• Dispose of old appliances in an environmentally
sound manner. Upon request we will take back
your old appliances bought from us and guarantee
an environmentally sound disposal of the devices.

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3
HC Heating controller
Contents
1 Overview .................................................... 4
2 Installation ................................................. 5
2.1 Mounting ....................................................................5
2.2 Electrical connection ...............................................6
2.3 Data communication / Bus ......................................7
2.4 SD card slot...............................................................7
3 Operation and function ............................ 8
3.1 Buttons .......................................................................8
3.2 Selecting menu points and adjusting values .......8
4 Commissioning........................................ 12
4.1 Initial commissioning..............................................12
4.2 Schemes with basic settings.................................13
4.3 Step-by-step parameterisation ............................23
5 Functions and options............................. 24
5.1 Menu structure .......................................................24
5.2 Status menu .............................................................25
5.3 Heating......................................................................25
5.4 Arrangement ...........................................................25
5.5 HQM .........................................................................25
5.6 Meas./ Balance values .............................................25
5.7 Messages...................................................................26
6 Heating..................................................... 26
6.1 Shared relays............................................................26
6.2 Heating circuits .......................................................29
6.3 Optional functions .................................................37
7 Arrangement ........................................... 43
7.1 Optional functions .................................................43
8 HQM ......................................................... 52
9 Basic settings ........................................... 53
10 SD card .................................................... 53
11 Manual mode .......................................... 55
12 User code ................................................ 56
13 In- / Outputs.............................................. 56
13.1 Modules ....................................................................56
13.2 Inputs.........................................................................57
13.3 Outputs ....................................................................58
13.4 PWM profiles ..........................................................59
14 Troubleshooting....................................... 61
15 Accessories .............................................. 64
15.1 Sensors and measuring instruments ..................64
15.2 VBus®accessories ..................................................64
15.3 Interface adapters...................................................65
16 Index ......................................................... 66

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1 Overview
• Extra large graphic display
• 5 relay outputs
• 8 (9) inputs for Pt1000, Pt500 or KTY tem-
perature sensors (system dependent)
• 2 inputs for digital Grundfos Direct Sen-
sors™
• 2 PWM outputs for speed control of high-
efficiency pumps
• Datalogging/ firmware updates via SD
memory card
• 9 pre-programmed basic systems
• 1 mixed heating circuit, 1 unmixed heating
circuit
• DHW heating
• Circulation (with EM extension module)
• Thermal disinfection (with EM extension
module)
• Pre-programmed optional functions (with
EM extension module)
• RESOL VBus®
• Energy-efficient switching-mode power
supply
Technical data
Inputs: 8 (9) inputs for Pt1000, Pt500, or KTY tem-
perature sensors (can optionally be used for RTA11-M
remote controls), 1 impulse inputV40, inputs for 2 dig-
ital Grundfos Direct Sensors™, 1 input for a CS10 ir-
radiation sensor
Outputs: 4 semiconductor relays, 1 potential-free relay,
2 PWM outputs
Switching capacity per relay:
1 (1) A 240 V~ (semiconductor relay)
4 (2) A 240 V~ (potential-free relay)
Total switching capacity: 4 A
Power supply: 100 ... 240 V~, 50 ... 60 Hz
Supply connection: type Y attachment
Standby power consumption: < 1W
Mode of operation: type 1.B.C.Y
Rated impulse voltage: 2,5 kV
Interfaces: RESOL VBus®, SD card slot
Functions: weather-compensated heating circuit
control,afterheating, DHW heating with priority logic,
circulation,thermal disinfection,heat quantity measure-
ment,optional functions such as solid fuel boiler,return
preheating, etc.
Housing: plastic, PC-ABS and PMMA
Mounting: wall mounting, also suitable for mounting
into patch panels
Display: full graphic display, control lamp (directional
pad) and background illumination
Operation: 7 push buttons at the front of the housing
Protection type: IP 20 / EN 60529
Protection class: I
Ambient temp.: 0 ... 40 °C
Degree of pollution: 2
Dimensions: 198 × 170 × 43 mm
170
198
43

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2 Installation
WARNING! Electric shock!
Upon opening the housing, live parts
are exposed!
ÎAlways disconnect the con-
troller from power supply
before opening the housing!
2.1 Mounting
The unit must only be located in dry interior rooms.
The controller must additionally be supplied from a
double pole switch with contact gap of at least 3mm.
Please pay attention to separate routing of sensor ca-
bles and mains cables. upper fastening point
lower fastening point
cover
screw
In order to mount the device to the wall, carry out
the following steps:
ÎUnscrew the cross-head screw from the cover
and remove it along with the cover from the
housing
ÎMark the upper fastening point on the wall. Drill
and fasten the enclosed wall plug and screw leav-
ing the head protruding
ÎHang the housing from the upper fastening point
and mark the lower fastening points (centres
150 mm)
ÎInsert lower wall plugs
ÎFasten the housing to the wall with the lower fas-
tening screws and tighten
ÎCarry out the electrical wiring in accordance
with the terminal allocation, see page 7
ÎPut the cover on the housing
ÎAttach with the fastening screw
Note
Strong electromagnetic fields can impair the
function of the controller.
Make sure the controller as well as the sys-
tem are not exposed to strong electromag-
netic fields.

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6
S1 S2 S3 S4 S5 S6 S7 S8
R4 R5
IP20
R5
N
R1-R4
100 ... 240 V~
50-60 Hz
T4A
1 (1) A 240 V~
4 (1) A 240 V~
4 (1) A 24V
R5
R3 R2 R1
L' L
GND
Temp. Sensor
PWM/0-10V
RPD
N
Isolate mains before removing cover!
Vor Öffnen Gerät spannungslos schalten!
Use ground common terminal block
Masse-Sammelklemme benutzen
Use neutral conductor common terminal block
Neutralleiter-Sammelklemme benutzen!
Use PE Common terminal block
Schutzleiter-Sammelklemme benutzen
VFD
CS10 V40/S9 VBus
VBus GND
HC
Made in Germany
input for Grundfos
Direct Sensors™
potential-free relay
sensor ground common
terminal block
sensor terminals
protective conductor
common terminal block (PE)
neutral conductor
common terminal block
PWM (0-10 V) terminals
VBus®
2.2 Electrical connection
WARNING! Electric shock!
Upon opening the housing, live parts
are exposed!
ÎAlways disconnect the con-
troller from power supply
before opening the housing!
WARNING! ESD damage!
Electrostatic discharge can lead to
damage to electronic components!
ÎTake care to discharge prop-
erly before touching the
inside of the device!To do
so, touch a grounded surface
such as a radiator or tap!
Note
Connecting the device to the power supply
must always be the last step of the instal-
lation!
Depending on the product version, cables are already
connected to the device. If that is not the case, please
proceed as follows:
The controller is equipped with 5 relays in total to
which loads such as pumps, valves, etc. can be con-
nected:
Relays 1 ... 4 are semiconductor relays, designed for
pump speed control:
Conductor R1 ... R4
Neutral conductor N (common terminal block)
Protective earth conductor PE (common terminal
block)
Relay 5 is a potential-free relay (normally open contact):
Connections to the R5 terminals can be made with
either polarity.
Temperature sensors (S1 to S9) have to be con-
nected to the terminals S1 ... S9 and GND (either po-
larity).
The terminal S9 can be used as an impulse input for a
V40 flowmeter or a FS08 flow switch.
A V40 flowmeter can be connected to the terminals
S9 /V40 and GND (either polarity).
Connect the irradiation sensor CS10 to the termi-
nals CS10 and GND with correct polarity. To do so,
connect the cable marked GND to the GND com-
mon terminal block, the cable marked CS to the ter-
minal marked CS10.
The terminals marked PWM are control outputs for
high-efficiency pumps.
In the In-/Outputs menu, relays can be allocated to
the PWM outputs.
Connect the digital Grundfos Direct Sensors™ to
the RPD and VFD inputs.
The controller is supplied with power via a mains
cable. The power supply of the device must be
100 ... 240 V~ (50 ... 60 Hz).
The mains connection is at the terminals:
Neutral conductor N
Conductor L
Conductor L' (L' is not connected with the mains
cable. L' is a fused contact permanently carrying
voltage)
Protective earth conductor PE (common termi-
nal block)
WARNING! Electric shock!
L' is a fused contact permanently
carrying voltage.
ÎAlways disconnect the con-
troller from power supply
before opening the housing!
Note
For more details about the initial commis-
sioning procedure, see page 12.

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7
2.3 Data communication / Bus
The controller is equipped with the RESOL VBus®
for data transfer with and energy supply to external
modules.The connection is carried out at the two ter-
minals marked VBus and GND (either polarity). One
or more RESOLVBus®modules can be connected via
this data bus, such as:
• RESOL AM1 Alarm module
• RESOL DL2 Datalogger
• RESOL EM Extension module
Furthermore, the controller can be connected to a
PC via the RESOL VBus®/ USB or VBus®/ LAN inter-
face adapter (not included).With the RESOL Service-
Center Software (RSC), measured values can be read,
processed and visualised.The software allows an easy
function control of the system.
Note:
For more information about accessories, see
page 64.
2.4 SD card slot
The controller is equipped with
an SD card slot.
With an SD card, the following
functions can be carried out:
• Store measurement and bal-
ance values onto the SD
card. After the transfer to a
computer, the values can be
opened and visualised, e. g. in a spreadsheet.
• Prepare adjustments and parameterisations on a
computer and transfer them via the SD card.
• Store adjustments and parameterisations on the SD
card and, if necessary, retrieve them from there.
• Download firmware updates from the Internet and
install them on the controller.
For more information about using an SD card, see
page 53.

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3 Operation and function
3.1 Buttons
The controller is operated via the 7 buttons next to
the display.They have the following functions:
Button
1
- scrolling upwards
Button
3
- scrolling downwards
Button - increasing adjustment values
Button 4- reducing adjustment values
Button
5
- confirming
Button 6- entering the status menu /chimney
sweeper or screed drying mode
(system-dependent)
Button 7- escape button for changing into the
previous menu
1
2
4
63
5
7
3.2 Selecting menu points and adjusting
values
During normal operation of the controller, the display
is in the main menu. If no button is pressed for a few
seconds, the display illumination goes out.
Press any button to reactivate the display illumination.
ÎIn order to scroll though a menu or to adjust a
value, press either buttons
1
and
3
or buttons
and 4
ÎTo open a sub-menu or to confirm a value, press
button
5
ÎTo enter the status menu, press button 6– un-
confirmed adjustments will not be saved
ÎTo enter the previous menu, press button 7–
unconfirmed adjustments will not be saved
If no button has been pressed within a couple of min-
utes, the adjustment is cancelled and the previous
value is retained.
Chimney sweeper / screed
The chimney sweeper function or the screed drying
function can be triggered with button 6. The chim-
ney sweeper function is activated by default. In order
to activate the screed drying function, the chimney
sweeper function must be deactivated in all heating
circuits (see page 34).
ÎIn order to trigger the chimney sweeper or
screed drying function, press and hold down but-
ton 6for 5 s.
If the symbol »is shown behind a menu item,pressing
button
5
will open a new sub-menu.
If a sensor has several functions, the symbol will
appear next to the allocated sensor function. Use but-
tons and 4to scroll to the allocated functions.
If the symbol
+
is shown in front of a menu item,
pressing button
5
will open a new sub-menu. If it is
already opened, a
–
is shown instead of the
+
.

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9
Values and adjustments can be changed in different
ways:
Numeric values can be adjusted by means of a slide
bar. The minimum value is indicated to the left, the
maximum value to the right.The large number above
the slide bar indicates the current adjustment. By
pressing buttons or 4the upper slide bar can
be moved to the left or to the right.
Only after the adjustment has been confirmed by
pressing button
5
will the number below the slide
bar indicate the new value. The new value will be
saved if it is confirmed by pressing button
5
again.
current value savedminimum value maximum value
adjusted value
(not yet confirmed)
adjustment channel
When 2 values are locked against each other, they will
display a reduced adjustment range depending on the
adjustment of the respective other value.
In this case, the active area of the slide bar is short-
ened, the inactive area is indicated as a dotted line.The
indication of the minimum and maximum values will
adapt to the reduction.
active area inactive area
If only one item of several can be selected, they will
be indicated with “radio buttons”.When one item has
been selected, the radio button in front of it is filled.
If more than one item of several can be selected, they
will be indicated with checkboxes.When an item has
been selected, an xappears inside the checkbox.

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10
Adjusting the timer
When the Timer option is activated, a timer is in-
dicated in which time frames for the function can be
adjusted.
First of all, an overview of the current adjustments is
displayed. For each day of the week there is an over-
view display. The display can be switched back and
forth between the different days by pressing buttons
or 4.
In order to adjust the timer, press button
5
.
First the individual days of the week or all days of the
week can be selected.
The last menu item after the list of days is Continue.
If Continue is selected, the Edit timer menu opens,
in which the time frames can be adjusted.
Adding a time frame:
The time frames can be adjusted in steps of 15 min-
utes.
In order to add an active time frame, proceed as fol-
lows:
ÎMove the cursor to the desired starting point of
the time frame by pressing buttons and 4.
Confirm the starting point of the time frame by
pressing button 1.
ÎMove the cursor to the desired ending point of
the time frame by pressing buttons and 4.
ÎThe end of a time frame can be determined by
pressing button
5
.
ÎIn order to add another time frame, repeat the
last 3 steps.
ÎPress button
5
again to get back to the over-
view of current adjustments.

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11
Removing a time frame:
In order to remove an active time frame, proceed as
follows:
ÎDetermine the point from which on the time
frame is to be removed by pressing button
3
.
ÎMove the cursor to the desired ending point of
the time frame by pressing buttons and 4.
ÎIn order to conclude removing the time frame,
press button
5
upon reaching the desired end-
ing point.
ÎPress button
5
again to get back to the over-
view of current adjustments.

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12
4 Commissioning
4.1 Initial commissioning
When the hydraulic system is filled and ready for op-
eration, connect the controller to the mains.
The controller runs an initialisation phase in which the
directional pad flashes red.
When the controller is commissioned for the first
time or when it is reset, it will run a commissioning
menu after the initialisation phase. The commission-
ing menu leads the user through the most important
adjustment channels needed for operating the system.
Commissioning menu
The commissioning menu consists of the channels
described in the following. In order to make an adjust-
ment, push button
5
. Adjust the value by pressing
buttons 4and 2, then push button
5
to con-
firm.The next channel will appear in the display.
5
5
Adjustment mode
Button navigation
Changing a value
Confirming a value
Next parameter appears
automatically
2
4
1. Language:
ÎAdjust the desired menu language.
2. Units:
ÎAdjust the desired temperature unit.
ÎAdjust the desired volume unit.
ÎAdjust the desired pressure unit.
ÎAdjust the desired energy unit.

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13
4. Time:
ÎAdjust the clock time. First of all adjust the hours,
then the minutes.
5. Date:
ÎAdjust the date. First of all adjust the year, then
the month and then the day.
3. Daylight savings time adjustment:
ÎActivate or deactivate the automatic daylight sav-
ings time adjustment.
7. Completing the commissioning menu:
After the scheme has been selected, a security en-
quiry appears. If the safety enquiry is confirmed, the
adjustments are saved.
ÎIn order to confirm the security enquiry, press
button
5
.
ÎIn order to reenter the commissioning menu
channels, press button 7.
6. Basic system:
ÎAdjust the desired scheme (heating circuit, de-
mand, DHW heating).
If the security enquiry has been confirmed, the
controller is ready for operation and should en-
able an optimum system operation.
All adjustments made during commissioning can, if
necessary, be changed later on in the basic settings
menu.
4.2 Schemes with basic settings
The controller is pre-programmed for 9 basic systems.
The basic pre-adjustments have already been made.
For afterheating it is necessary to allocate the demand
and the boiler loading pump by means of shared relays.
Afterwards the system can easily be extended.
Relay and sensor allocation correspond to the figure.
Scheme 0 has no pre-adjustments.

14
en
Scheme 1: one mixed heating circuit
S2
S1
R1
R2/3
S1 S2 S3 S4 S5 S6 S7 S8
R4 R5
IP20
R5
N
R3 R2 R1
L' L
GND
PWM/0-10V
RPD
VFD
CS10 V40/S9 VBus
VBus GND
Sensors
S1 Flow HC1 1 / GND
S2 Outdoor 2 / GND
S3 Free 3 / GND
S4 Free 4 / GND
S5 Free 5 / GND
S6 Free 6 / GND
S7 Free 7 / GND
S8 Free 8 / GND
Temperature sensors
Relay outputs
Mains
19 / N / PE
Relays
R1 Pump HC1 17 / N / PE
R2 Mixer open 16 / N / PE
R3 Mixer closed 15 / N / PE
R4 Free 14 / N / PE
R5 Free 13 / 12
By means of the flow sensor S1 and the outdoor temperature sensor S2, a mixed
weather-compensated heating circuit can be controlled.

15
en
Sensors
S1 Flow HC1 1 / GND
S2 Outdoor 2 / GND
S3 Free 3 / GND
S4 Afterheating / boiler 4 / GND
S5 Free 5 / GND
S6 Free 6 / GND
S7 Free 7 / GND
S8 Free 8 / GND
Relays
R1 Pump HC1 17 / N / PE
R2 Mixer open 16 / N / PE
R3 Mixer closed 15 / N / PE
R4 Free 14 / N / PE
R5 Demand 13 / 12
Scheme 2: one mixed heating circuit with afterheating (demand)
S2
S1
R1
R2/3
S1 S2 S3 S4 S5 S6 S7 S8
R4 R5
IP20
R5
N
R3 R2 R1
L' L
GND
PWM/0-10V
RPD
VFD
CS10 V40/S9 VBus
VBus GND
S4
R5
Temperature sensors
Relay outputs
Mains
19 / N / PE
By means of the flow sensor S1 and the outdoor temperature sensor S2, a mixed
weather-compensated heating circuit can be controlled. Boiler demand via the
potential-free relay is triggered depending on the temperature difference between
the set flow temperature and the value measured at the afterheating sensor S4.

16
en
Sensors
S1 Flow HC1 1 / GND
S2 Outdoor 2 / GND
S3 Free 3 / GND
S4 Afterheating / boiler 4 / GND
S5 Free 5 / GND
S6 Free 6 / GND
S7 Free 7 / GND
S8 Free 8 / GND
Relays
R1 Pump HC1 17 / N / PE
R2 Mixer open 16 / N / PE
R3 Mixer closed 15 / N / PE
R4 Boiler loading pump 14 / N / PE
R5 Demand 13 / 12
Scheme 3: one mixed heating circuit with afterheating (demand and boilder loading pump)
S4
R5
S2
S1
R1
R2/3
R4
S1 S2 S3 S4 S5 S6 S7 S8
R4 R5
IP20
R5
N
R3 R2 R1
L' L
GND
PWM/0-10V
RPD
VFD
CS10 V40/S9 VBus
VBus GND
Temperature sensors
Relay outputs
Mains
19 / N / PE
By means of the flow sensor S1 and the outdoor temperature sensor S2, a mixed
weather-compensated heating circuit can be controlled. Boiler demand via the
potential-free relay and control of the boiler loading pump are triggered depending
on the temperature difference between the set flow temperature and the value
measured at the afterheating sensor S4.

17
en
Scheme 4: one mixed heating circuit with DHW heating
S3
S2
S1
R1
R2/3
R4
S1 S2 S3 S4 S5 S6 S7 S8
R4 R5
IP20
R5
N
R3 R2 R1
L' L
GND
PWM/0-10V
RPD
VFD
CS10 V40/S9 VBus
VBus GND
Temperature sensors
Relay outputs
Mains
19 / N / PE
Sensors
S1 Flow HC1 1 / GND
S2 Outdoor 2 / GND
S3 DHW 3 / GND
S4 Free 4 / GND
S5 Free 5 / GND
S6 Free 6 / GND
S7 Free 7 / GND
S8 Free 8 / GND
Relays
R1 Pump HC1 17 / N / PE
R2 Mixer open 16 / N / PE
R3 Mixer closed 15 / N / PE
R4 DHW loading pump 14 / N / PE
R5 Free 13 / 12
By means of the flow sensor S1 and the outdoor temperature sensor S2, a mixed
weather-compensated heating circuit can be controlled. DHW heating is triggered
depending on the value measured at the DHW sensor S3.

18
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Scheme 5: one mixed heating circuit with DHW heating and afterheating (demand for heating circuit and DHW)
S3
S2
S1
R1
R2/3
R4
S1 S2 S3 S4 S5 S6 S7 S8
R4 R5
IP20
R5
N
R3 R2 R1
L' L
GND
PWM/0-10V
RPD
VFD
CS10 V40/S9 VBus
VBus GND
S4
R5
Temperature sensors
Relay outputs
Mains
19 / N / PE
Sensors
S1 Flow HC1 1 / GND
S2 Outdoor 2 / GND
S3 DHW 3 / GND
S4 Afterheating / boiler 4 / GND
S5 Free 5 / GND
S6 Free 6 / GND
S7 Free 7 / GND
S8 Free 8 / GND
Relays
R1 Pump HC1 17 / N / PE
R2 Mixer open 16 / N / PE
R3 Mixer closed 15 / N / PE
R4 DHW loading pump 14 / N / PE
R5 Demand 13 / 12
By means of the flow sensor S1 and the outdoor temperature sensor S2, a mixed
weather-compensated heating circuit can be controlled. DHW heating is triggered
depending on the value measured at the DHW sensor S3. Boiler demand via the
potential-free relay is triggered depending on the temperature difference between
the set flow temperature and the value measured at the afterheating sensor S4.
DHW heating is triggered depending on the value measured at the DHW sensor S3.

19
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Scheme 6: one mixed and one unmixed heating circuit
S2
S1
S3
R1
R2/3
R4
S1 S2 S3 S4 S5 S6 S7 S8
R4 R5
IP20
R5
N
R3 R2 R1
L' L
GND
PWM/0-10V
RPD
VFD
CS10 V40/S9 VBus
VBus GND
Temperature sensors
Relay outputs
Mains
19 / N / PE
Sensors
S1 Flow HC1 1 / GND
S2 Outdoor 2 / GND
S3 Flow HC2 3 / GND
S4 Free 4 / GND
S5 Free 5 / GND
S6 Free 6 / GND
S7 Free 7 / GND
S8 Free 8 / GND
Relays
R1 Pump HC1 17 / N / PE
R2 Mixer open 16 / N / PE
R3 Mixer closed 15 / N / PE
R4 Pump HC2 14 / N / PE
R5 Free 13 / 12
By means of the flow sensors S1 and S3 respectively and the outdoor sensor S2,
a mixed and an unmixed weather-compensated heating circuit can be controlled.

20
en
Scheme 7: one mixed and one unmixed heating circuit with afterheating (demand)
S2
S1
S3
R1
R2/3
R4
S1 S2 S3 S4 S5 S6 S7 S8
R4 R5
IP20
R5
N
R3 R2 R1
L' L
GND
PWM/0-10V
RPD
VFD
CS10 V40/S9 VBus
VBus GND
S4
R5
Temperature sensors
Relay outputs
Mains
19 / N / PE
Sensors
S1 Flow HC1 1 / GND
S2 Outdoor 2 / GND
S3 Flow HC2 3 / GND
S4 Afterheating / boiler 4 / GND
S5 Free 5 / GND
S6 Free 6 / GND
S7 Free 7 / GND
S8 Free 8 / GND
Relays
R1 Pump HC1 17 / N / PE
R2 Mixer open 16 / N / PE
R3 Mixer closed 15 / N / PE
R4 Pump HC2 14 / N / PE
R5 Demand 13 / 12
By means of the flow sensors S1 and S3 respectively and the outdoor tempera-
ture sensor S2, one mixed and one unmixed weather-compensated heating circuit
can be controlled. Boiler demand via the potential-free relay is triggered depend-
ing on the temperature difference between the set flow temperatures and the
value measured at the afterheating sensor S4.