Resol DeltaSol C/4 User manual

D e lt a S o l® C/4
www.resol.com
Thank you for buying this RESOL product.
Please read this manual carefully, to get the best performance from this unit.
RESOL D e lt a S o l® C/4
Mounting
Connection
Operation
Troubleshooting
Examples
Manual
en
48002941
*48002941*

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Table of contents
Safety advice... ...................................................................................... 2
Overview of functions and technical data........ ............................ ......3
1. Installation ................................................................................ 4
1.1 Mounting .......................................................................................................... 4
1.2 Electrical connection .................................................................................... 5
1.2.1 Standard solar system................................................................................... 5
1.2.2 Solar system and afterheating ..................................................................... 6
2. Operation and function ........................................................... 6
2.1 Buttons for adjustment ................................................................................ 6
2.2 System Monitoring display ........................................................................... 7
2.2.1 Channel display .............................................................................................. 7
2.2.2 Toolbar ............................................................................................................. 7
2.2.3 System-Screen ................................................................................................ 7
2.3 Flashing codes ................................................................................................. 8
3. Commissioning ........................................................................ 9
4. Control parameters and and display channels ................... 10
4.1 Overview of channels .................................................................................10
4.1.1-7 Display channels ...........................................................................................11
4.1.8-20 Adjustment channels ...................................................................................12
5. Troubleshooting ..................................................................... 16
5.1 Various ...........................................................................................................17
6. Accessory ............................................................................... 19
Imprint ................................................................................................ 20
Subject to change. Errors excepted
Safety advice
Please pay attention to the following
safety advice in order to avoid danger
and damage to people and property.
Appropriate usage
This product is to be used in simple
solar thermal systems in com pliance
with the technical data specified in
these instructions.
Improper use excludes all liability
claims
Instructions:
Attention should be paid to
- valid local regulations
- the statutory provisions for preven-
tion of industrial accidents,
- the statutory provisions for environ-
mental protection,
- the Health and Safety at Work Act
1974
- Part P of the Building Regulations
2005
- BS7671 Requirements for electrical
installations and relevant safety re-
gulations of DIN, EN, DVGW, TRGI,
TRF and VDE.
These instructions are exclusively
addressed to authorised skilled per-
sonnel.
- Only qualified electricians should
carry out installation and mainte-
nance work.
- Initial installation should be carried
out by named qualified personnel
Declaration of conformity
We, RESOL Elektronische Regelungen GmbH, D-45527 Hattingen, declare
under our sole responsibility that our product D e l t a S o l ® C complies with
the following standards:
EN 55 014-1
EN 60 730-1
According to the regulations of the above directives, the product is labelled
with :
89/336/EWG
73/ 23/EWG
Hattingen, 07.October 2007
RESOL Elektronische Regelungen GmbH,
ppa. Gerald Neuse

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62
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Overview of functions
• System-Monitoring display
• up to 4 temperature sensors
Pt1000
• heat quantity measurement
• function control
• user-friendly operation
through easy handling
• easy-to-mount housing with
outstanding design
• speed control, solar operating
hours counter, thermostat
function
• RESOL VBus®
• real time clock
Technical Data
Housing: plastic, PC-ABS and PMMA
Protection type: IP 20 / DIN 40050
Ambiant temp.: 0 ... 40 °C
Dimensions: 172 x 110 x 46 mm
Mounting: wall mounting, also suitable
for mounting into patch panels
Display: System-Monitor for sys-
tem visualisation, 16-segment display,
7-segment display, pictograms
Operation: 3 push buttons at the
front of the housing
Functions: Temperature differential
controller with optional add-on func-
tions. function control according to
BAW-guidelines, operating hours coun-
ter, tube collector function, speed con-
trol and heat quantity measurement
Inputs: for 4 temperature sensors
Pt1000
Outputs:
1 semiconductor relay, 1 standard relay
Bus: RESOL VBus®
Power supply:
100 ... 240 V~
Total switching capacity:
3 (2) A (100 ... 240) V~
Mode of operation:
Type 1.y
Switching capacity per relay:
Semiconductor relay:
1 (1) A (100 ... 240) V~
Electromechanical relay:
2 (1) A (100 ... 240) V~
Scope of delivery:
1 x D e l t a S o l® C/4
1 x accessory bag
1 x spare fuse T2A
2 x screws and dowels
4 x strain relief and screw
Additionally contained in the full kit:
1 x sensor FKP6
2 x sensor FRP6

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display
push button
fuse
cable conduit
with strain relief
cover
1.1 Mounting
1. Installation
130
fastening
fastening
base
Examples D e lt a S o l® C/4
standard solar system solar system
with afterheating
Order note
RESOL D e lt a S o l ® C / 4
RESOL D e lt a S o l® C / 4 - full kit
incl. 3 temperature sensors Pt1000 (1 x FKP6, 2 x FRP6)
The unit must only be located in dry interior locations. It
is not suitable for installation in hazardous locations and
should not be placed close to any electromagnetic fields. The
controller must additionally be supplied from a double pole
switch with contact gap of at least 3 mm. Please pay atten-
tion to separate routing of sensor cables and mains cables.
1. Unscrew the cross-head screw from the cover and re-
move it along with the cover from the housing.
2. Mark the upper fastening point on the wall and drill and
fasten the enclosed wall plug and screw leaving the head
protruding.
3. Hang the housing from the upper fastening point and
mark the lower fastening point through the hole in the
terminal box (centres 130 mm). Drill and insert the lower
wall plug.
4. Hang the housing from the upper fastening point and
tighten lower fastening screw.
WARNING!
Always disconnect the controller
from power supply before open-
ing the housing!

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1.2 Electrical connection The power supply to the controller must be carried out via
an external power switch (last step!) and the supply voltage
must be 100 ... 240 V~ (50 ... 60 Hz). Flexible cables must be
attached to the housing with the enclosed strain relief and
the corresponding screws.
The controller is equipped with 2 relays to which loads
such as pumps, valves etc. can be connected:
• Relay 1
18 = conductor R1
17 = neutral conductor N
13 = ground clamp
• Relay 2
16 = conductor R2
15 = neutral conductor N
14 = ground clamp
The temperature sensors (S1 to S4) have to be connec-
ted to the following terminals (either polarity):
1 / 2 = sensor 1 (e. g. sensor collector 1)
3 / 4 = sensor 2 (e. g. sensor store 1)
5 / 6 = Sensor 3 (temperature sensor S3)
7 / 8 = sensor 4 (e. g. sensor store TRF)
The mains connection is carried out at the following
terminals:
19 = neutral conductor N
20 = conductor L
12 = ground clamp
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 terminals 9
and 10 marked “VBus®“ (either polarity). One or more
RESOL VBus® modules can be connected via this data bus:
• RESOL calorimeter
• RESOL large display / Smart Display
• RESOL datalogger
Electrostatic discharge can cause damage of electronic
components!
High-voltage components!
Note:
One of the relays is a semiconductor relay for pump speed
control. A minimum load of 20 W (power consumption of
the load) is required for faultless function. The capacitor
from th e accessory bag must be connected in parallel to
the respective relay output if it feeds auxiliary relays, motor
valves, etc.
Attention: The minimum pump speed must be set to 100%
when auxiliary relays or valves are connected.
VBus
910
1 (1) A (100 ... 240) V~
1 (1) A (100 ... 240) V~
R1
R2
IP 20
T2A
100 ... 240 V~
50-60 Hz
mains terminals
fuse
load terminals
sensor terminals ground terminals
S1
S2
S4 / TRF
1.2.1 Terminal allocation Arr1 Standard solar system with 1 store, 1 pump and 3
sensors. Sensor S4 / TRF can optionnally be used for heat
quantity measurement.
R1
ARR 1
S3
Symbol Description
S1 collector sensor
S2 store base sensor
S3 store top sensor
(optional)
S4 / TRF sensor for heat
quantity measure-
ment (optional)
R1 solar pump

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1
2
3
backwards
SET
(selection-/
adjustment mode)
2. Operation and function
2.1 Buttons for adjustment
Connect the controller to the mains. The controller is in
an initialisation phase. After this phase, the controller is in
automatic operation with factory settings.
The controller is then ready for operation and normally the
factory settings will give close to optimum operation.
The controller is operated via the 3 push buttons below
the display. The forward-button (1) is used for scrolling
forward through the menu or to increase the adjustment
values. The backward-button (2) is similarly used for scroll-
ing backwards and reducing values.
In order to access the adjustment mode, scroll down in the
display menu and press the forward button (1) for approx.
2 seconds after you have reached the last display item. If
an adjustment value is shown on the display, the icon
is displayed. Now, you can access the adjustment mode by
using button 3.
— Press buttons 1 and 2 in order to select a channel
— Briefly press button 3, appears (flashing)
( -mode)
— adjust the requested value by pressing the buttons 1 and 2
— Briefly press button 3, so that permanently appears,
the adjusted value will be saved.
forwards
R2
S1
S2
R1 S3
S4 / TRF
Solar system with afterheating with 1 store, 3 sensors
and afterheating. Sensor S4 / TRF can be optionally used for
heat quantity measurement.
ARR2
1.2.2 Terminal allocation Arr 2
Symbol Description
S1 collector sensor
S2 store base sensor
S3 store top sensor /
thermostat sensor
S4 / TRF sensor for
heat quantity measurement
(optional)
R1 solar pump
R2 pump afterheating

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The system monitoring display consists of 3 ranges: The
channel display, the toolbar and the system-screen
(active arrangement).
The channel display consists of 2 lines. The upper line is an
alpha-numeric 16-segment display (text display) for display-
ing channel names and menu items. In the lower 7-segment
display, the channel values and the adjustment parameters
are displayed.
Temperatures and temperature differences are indicated
in or .
2.2.1 Channel display
Channel display
2.2.2 Symbolleiste
The additional symbols in the toolbar indicate the actual
system status.
Toolbar
2.2 System-Monitoring display
Monitoring-Display
The system screen (active arrangement) shows the scheme
which has been selected. The screen consists of several
system component symbols, which are - depending on the
current status of the system - either flashing, permanently
shown or „hidden“.
2.2.3 System-Screen
System-Screen
Symbol normal flashing
relay 1 active
relay 2 active
store maximum limitation active
/ maximum store temperature
exceeded
collector cooling function active
recooling function active
antifreeze function active
collector minimum limitation
active
antifreeze function active
Kollektornotabschaltung aktiv
oder Speichernotabschaltung
+sensor fault
+manual mode
change of adjustment channel
SET-mode

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sensor
collector 1
pumps
sensor
additional symbol
operation of the
burner
valve
store
store heat exchanger afterheating (with additional
symbol)
store top sensor
collector with collector sensor
pump
store
with heat exchanger
afterheating
with burner symbol
temperature sensor
2.3 Flashing codes • Pump symbols are flashing during the initialisation phase
• Sensor symbols are flashing when the corresponding sen-
sor display channel is selected.
• Sensor symbols are flashing in the case of a sensor fault.
• Burner symbol is flashing when the after-heating is active.

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3. Commissioning
When the controller is commissionend for the first time, the arrangement has to be
selected first
1. Switch on power supply. After initialisation, the controller
is in the automatic mode with typical settings. The pre-
programmed system scheme is Arr 1.
2. - select the adjustment channel Arr
- change to the -mode (see 2.1)
- select the arrangement via the Arr-index number
- save the adjustment by pressing the button
Now the controller is ready for operation with typical settings
to suit that system and normally the factory settings will give
close to optimum operation.
Overview of arrangements:
Arr 1 : standard solar system
Arr 2 : solar system with after-heating
(2) backwards
(1) forwards
(3) SET
(selection / adjustment mode)
ARR 1 ARR 2

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4. Control parameters and display channels
4.1 Overview of channels
Legend:
x
Corresponding channel is available.
x*
Corresponding channel is available when the corresponding
option is enabled
 
Only if the option heat quantity measurement is activated
(OHQM), will the corresponding channel be available.
MEDT
Only if an antifreeze (MEDT) other than water or Tyfo-
cor LS / G-LS (MEDT 0 or 3) is used, will the channel
antifreeze concentration (MED%) be displayed.
 
Only if the option heat quantity measurement is deactivated
(OHQM), will the corresponding channel be available.
Note:
Only if temperature sensors are connected, will S3 and S4
be displayed.
channel ARR description page
1 2*
COL x x temperature collector 1 11
TST x temperature store 1 11
TSTL x temperature store 1 base 11
TSTU x temperature store 1 top 11
S3 x temperature sensor 3 11
TRF   temperature return sensor 11
S4   temperature sensor 4 11
n % x speed relay 1 11
n1 % x speed relay 1 11
h P x operating hours relay 1 11
h P1 x operating hours relay 1 11
h P2 x operating hours relay 2 11
kWh   heat quantity kWh 12
MWh   heat quantity MWh 12
time clock time 11
ANL 1-2 arrangement
DT O x x switch-on temperature difference 12
DT F x x switch-off temperature difference 12
DT S x x set temperature difference 13
RIS x x rise 13
S MX x x maximum temperature store 1 13
EM x x emergency temperature collector 1 13
channel ARR description page
1 2
OCX x x option collector cooling
collector 1 13
CMX x* x* maximum temperature collector 1 13
OCN x x option minimum limitation
collector 1 14
CMN x* x* minimum temperature collector 1 14
OKF x x option frost protection collector 1 14
CFR x* x* frost protection temperature
collector 1
14
OREC x x option recooling 14
O TC x x option tube collector 14
AH O x switch-on temperature
thermostat 1
15
AH F x switch-off temperature
thermostat 1
15
t1O x switch-on time 1 thermostat 15
t1F x switch-off time 1 thermostat 15
t2O x switch-on time 2 thermostat 15
t2F x switch-off time 2 thermostat 15
t2O x switch-on time 3 thermostat 15
t3F x switch-off time 3 thermostat 15
OHQM x option heat quantity measurement 12
FMAX   maximum flow rate 12
MEDT   antifreeze type 12
MED% MEDT MEDT antifreeze concentration 12
nMN x minimum speed relay 1 15
n1MN x minimum speed relay 1 15
HND x manual operation relay 1 15
HND1 x manual operation relay 1 15
HND2 x manual operation relay 2 15
LANG x x language 16
PROG XX.XX program number
VERS X.XX version number

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4.1.1 Collector temperature
Displays the actual collector temperature.
• COL : collector temperature
COL:
Collector temperature
Display range: -40 ... +250 °C
4.1.2 Store temperatures
Displays the actual store temperature.
• TST : store temperature
• TSPL : store temperature base
• TSPU : store temperature top
TST, TSTL, TSTU:
Store temperature
Display range: -40 ... +250 °C
4.1.3 Sensors 3 and 4
Display of the current temperature at the corresponding
additional sensor (without control function).
• S3 : temperature sensor 3
• S4 : temperature sensor 4
Note: Only if temperature sensors are connected, will
S3 and S4 be displayed.
S3, S4:
Sensor temperatures
Display range: -40 ... +250 °C
4.1.4 Other temperatures
Display of the current temperature at the sensor.
• TRF : temperature - return
TRF:
Other measured
temperatures
Display range: -40 ... +250 °C
4.1.5 Pump speed
Display of the actual pump speed.
• n % : actual pump speed (1-pump system)
• n1 % : actual pump speed pump 1
n %, n1 %:
Actual pump speed
Display range: 30 ... 100 %
4.1.6 Operating hours counter
The operating hours counter accumulates the solar operating
hours of the respective relay (h P / h P1 / h P2). Full hours
are displayed.
The accumulated operating hours can be set back to zero.
As soon as one operating hours channel is selected, the sym-
bol is displayed. Press the SET (3) button for approx. 2
seconds in order to access the RESET-mode of the counter.
The display symbol will flash and the operating hours
will be set to 0. Confirm the reset with the button in
order to finish the reset.
In order to interrupt the RESET-process, do not press a
button for about 5 seconds. The display returns to the
display mode.
h P / h P1 / h P2:
Operating hours counter
Display channel
4.1.7 Time
In this channel the current time is indicated.
Press button for 2 seconds, the hours will then be
displayed. Press the button again, the minutes will then be
displayed (flashing). The time can be set using buttons 1 and
2 and saved by pressing the button.

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4.1.8 Heat quantity measurement
OHQM: Heat quantity
measurement
Adjustment range: OFF...ON-
Factory setting: OFF
Heat quantity measurement is possible if a flowmeter is
used. For this purpose, the heat quantity measurement option
OHQM has to be enabled.
The flow rate should be read from the flowmeter (l/min)
and has to be adjusted in the channel FMAX. Antifreeze
type and concentration of the heat transfer medium have
to be adjusted in the channels MEDT and MED%.
Antifreeze type:
0 : water
1 : propylene glycol
2 : ethylene glycol
3 : Tyfocor® LS / G-LS
FMAX: Flow rate in l/min
Adjustment range: 0...20,
in 0.1 steps
Factory setting: 6,0
kWh/MWh:Heat quantity
kWh / MWh
Display channel
MEDT: Antifreeze type
Adjustment range: 0...3
Factory setting: 1
MED%: Antifreeze concen-
tration in (Vol-) %
When MEDT 0 or 3 is used,
the parameter MED% is
‚hidden‘.
Adjustment range: 20... 70
Factory setting: 45
The flow rate as well as the reference sensors S1 (flow) and
S4 (return) are used for calculating the heat quantity supplied.
It is shown in kWh in the channel kWh uand in MWh in the
channel MWh . The overall heat quantity results from the
sum of both values.
The accumulated operating hours can be set back to zero.
As soon as one of the display channels of the heat quantity
is selected, the symbol is displayed. Press the SET (3)
button for approx. 2 seconds in order to access the RESET-
mode of the counter. The display symbol will flash and
the heat quantity value will be set to 0. Confirm the reset
with the button in order to finish the reset.
In order to interrupt the RESET process, no button should
be pressed for about 5 seconds. The display returns to the
display mode.
4.1.9 ∆T-regulation
Please note: The switch-on temperature difference must
be at least 1 K higher than the switch-off tempe rature
difference.
DT O:
Switch-on temperature diff.
Adjustment range: 1,0...20,0 K
Factory setting: 6.0
DT F:
Switch-off temperature diff.
Adjustment range: 0,5 ... 19,5 K
Factory setting 4.0 K
This function is a standard differential control. If the switch-
on differential is reached (DT O), the pump is operated. The
pump runs at 100% speed for 10 seconds. After this period,
the pump runs at minimum pump speed (nMN = 30 %). If
the temperature difference reaches the adjusted set value
(DT S), pump speed will increase by one step (10%). If the
difference increases by 2 K (RIS), pump speed will increase
by 10 % respectively until the maximum pump speed of 100 % is
reached. The response of the controller can be adapted via the
parameter „Rise“. If the temperature difference falls below
the adjusted switch-off temperature difference (DT F),
the controller switches off.

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4.1.10 Maximum store temperature If the adjusted maximum temperature is exceeded, the store
will no longer be loaded in order to avoid damage caused by
overheating. If the maximum store temperature is exceeded,
(flashing) is shown on the display.
Note: The controller is equipped with a store emergency
shutdown function, which prevents the store from being
loaded when the store temperature exceeds 95 °C.
S MX:
Maximum store temperature
Adjustment range: 2 ... 95 °C
Factory setting: 60 °C
DT S:
Set temperature difference
Adjustment range: 1,5..30,0 K
Factory setting: 10.0 K
RIS
Rise
Adjustment range: 1 ... 20 K
Factory setting: 2 K
CMX: Maximum collector
temperature
Adjustment range:
100 ... 190 °C
Factory setting: 120 °C
4.1.12 System cooling When the adjusted maximum store temperature is reached,
the system stagnates. If the collector temperature increases
to the adjusted maximum collector temperature (CMX)
the solar pump is activated until the collector temperature
falls below the maximum collector temperature. The store
temperature may increase (subordinate active maximum
store temperature), but only up to 95 °C (emergency shut-
down of the store).
OCX:
Option system cooling
Adjustment range: OFF ... ON
Factory setting: OFF
4.1.11 Collector-limit temperature
Collector emergency shutdown
If the adjusted collector emergency shutdown temperature
(EM) is exceeded, the controller will switch off the solar
pump (R1) in order to protect the system against overheat-
ing (collector emergency shutdown). The factoring setting is
140 °C but it can be changed within the adjustment range of
110 ... 200 °C. If the temperature is exceeded, (flashing) is
shown on the display.
EM: Collector emergeny shut-
down temperature
Adjustment range:
110 ... 200°C
Factory setting: 140 °C
If OREC is additionnally enabled: If the store temperature is higher than the maximum store
temperature (S MX) and if the collector temperature is at
least 5 K below the store temperature, the solar system
remains activated until the store is cooled down below the
adjusted maximum temperature (S MX) via the collector
and the pipework.
If the system cooling function is enabled, (flashing) is
shown on the display. Due to the cooling function, the sys-
tem will have a longer operation time on hot summer days
and guarantees thermal relief of the collector field and the
heat transfer fluid.

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4.1.16 Tube collector function If the controller detects an increase in collector tempera-
ture by 2 K compared to the previously stored collector
temperature, the solar pump will be switched-on for about
30 seconds in order to detect the fluid temperature. After
this, the current collector temperature will be saved as a
new reference value. If the measured temperature (new
reference value) is exceeded by 2 K, the solar pump will
run for 30 seconds. If the switch-on difference between the
collector and the store is exceeded during the runtime of
the solar pump or the standstill of the system, the controller
will automatically switch to solar loading.
If the collector temperature deacreases by 2 K during stand-
still, the switch-on value for the tube collector function will
be recalculated.
O TC:
Tube collector function
Adjustment range: OFF ... ON
Factory setting: OFF
4.1.15 Recooling function If the adjusted maximum store temperature (S MX) is
reached, the controller keeps the solar pump running in
order to prevent the collector from being overheated.
The store temperature may increase, but only up to 95 °C
(emergency shutdown of the store).
The solar pump is switched on as soon as possible (depend-
ing on weather conditions). It is switched off when the store
is cooled down to the adjusted maximum temperature via
the collector and the pipework.
OREC: Recooling
Adjustment range: OFF... ON
Factory setting: OFF
CMN: Collector minimum
temperature
Adjustment range: 10 ... 90 °C
Factory setting: 10 °C
4.1.13 Minimum collector function option
OCN: Minimum collector
function
Adjustment range: OFF / ON
Factory setting: OFF
The minimum collector temperature is the minimum tem-
perature which must be exceeded for the solar pump (R1)
to switch on. The minimum temperature prevents the pump
from being switched on too often at low collector tempera-
tures. If the temperature falls below the minimum tempera-
ture, (flashing) is shown on the display.
CFR:
Antifreeze temperature
Adjustment range: -10 ...10 °C
Factory setting: 4,0 °C
4.1.14 Antifreeze function
OCF:
Antifreeze function
Adjustment range: OFF / ON
Factory setting: OFF
The antifreeze function activates the loading circuit between
the collector and the store when the temperature falls be-
low the adjusted antifreeze temperature. This will protect
the fluid against freezing or coagulating. If the adjusted anti-
freeze temperature is exceeded by 1 °C, the loading circuit
will be deactivated.
Note:
Since this function uses the limited heat quantity of the
store, the antifreeze function should be used in regions with
few days of temperatures around the freezing point.

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The thermostat function works independently from the
solar operation and can be used for using surplus energy
or for after-heating.
• AH O < AH F
thermostat function for after-heating
• AH O > AH F
thermostat function for using surplus energy
When the 2nd relay output is active, is displayed.
4.1.17 Thermostat function
(ARR = 2)
afterheating use of surplus heat
AH O:
Thermostat switch-on tem p.
Adjustment range:
0,0 ... 95,0 °C
Factory setting: 40,0 °C
AH F:
Thermostat switch-off tem p.
Adjustment range:
0,0 ... 95,0 °C
Factory setting: 45,0 °C
For control and service work, the operating mode of the
controller can be manually adjusted. For this purpose, select
the adjustment value HAND / HND1 / HND2. The following
adjustments can be carried out:
4.1.19 Operating mode
• HAND / HND1 / HND2
operating mode
OFF : relay off (flashing) +
AUTO : relay in automatic operation
ON : relay on (blinkend) +
HAND / HND1 /
HND2:
Operating mode
Adjustment range:
OFF, AUTO, ON
Factory setting: AUTO
4.1.18 Pump speed control A relative minimum pump speed is allocated to the output
R1 via the adjustment channel nMN.
ATTENTION:
When loads which are not speed controlled (e.g.
valves) are used, the value must be changed to 100 %
in order to deactivate pump speed control.
nMN:
Pump speed control
Adjustment range: 30 ... 100
Factory setting: 30
t1 O, t2 O, t3 O:
Thermostat switch-on time
Adjustment range:
00:00 ... 23:45
Factory setting: 00:00
t1 F, t2 F, t3 F:
Thermostat switch-off time
Adjustment range:
00:00 ... 23:45
Factory setting: 00:00
In order to block the thermostat function for a certain
period of time, there are 3 time frames t1 ... t3. If the func-
tion should be activated only between e.g. 6:00 and 9:00, set
t1 O to 6:00 and t1 F to 09:00. The thermostat function is
continuously activated (factory setting).
If all time frames are set to 00:00, the thermostat function
is continuously activated (factory setting).

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5. Troubleshooting
VBus
910
1 (1) A (100 ... 240) V~
1 (1) A (100 ... 240) V~
R1
R2
IP 20
T2A
100 ... 240 V~
50-60 Hz
fuse T2A
If a malfunction occurs, a notification is given on the display
of the controller:
Warning symbol
On the display appears the symbol and the symbol
.
Sensor defect. An error code is shown
on the relevant sensor indication channel
instead of a temperature.
- 88.8888.8
Line break. Check
the line.
Short-circuit.
Check the line.
Pt1000-temperature sen sors pinched
off can be checked with an ohmmeter.
In the following the resistance values
corresponding to different temperatures
are listed.
Resistance values of
the Pt1000-sensors
4.1.20 Language (LANG) In this channel, different languages are available.
• dE : German
• En : English
• It : Italian
• Fr : French
LANG:
Language choice
Adjustment range:
dE, En, It, Fr
Factory setting: En

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Pump starts for a short moment, switches-off, switches-on
again, etc. („controller hunting“)
Is the temperature diffe-
rence at the controller
too small?
no yes
Wrong placing of the
collector sensor?
yes
Change ∆Ton and ∆Toff
accordingly.
Mount the collector sen-
sor at solar feed flow
(warmest collector out-
put); use the immersion
sleeve of the respective
collector.
Pump starts up very late and soon stops working soon. The temperature difference between store and collector
increases enormously during operation; the collector cir-
cuit cannot dissipate the heat.
Collector circuit pump
defect ?
no yes
Heat exchanger calcified?
yes
Control / replace
Decalification
no
Heat exchanger plugged?
yesno Cleaning
Heat exchanger too
small?
yes Replace with correctly
sized one.
no
Plausibility control of the
option tube collector spe-
cial function?
Change ∆Ton and ∆Toff
accordingly.
Switch-on-temperature
difference ∆Ton too
large?
no yes
Collector sensor un favour-
able placed (e.g. contact
sensor instead of immersion
sleeve sensor?
o.k.no
Pump is overheated, but no heat transfer from collector
to the store, feed flow and return flow are equally warm,
perhaps also bubble in the lines.
Exhaust the system; in-
crease system pressure
to at least static primary
pressure plus 0,5 bar; if
necessary continue to
increase, switch the pump
for a short time off and
on.
Air in the system?
no yes
Is the collector circuit
plugged at the dirt trap?
yes
Clean the dirt trap
5.1Various
If necessary activate tube
collector function.
yes
o.k.

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Stores are cooled during the night.
Does collector circuit
pump run during the
night?
no yes
Check the controller
functions
Collector temperature is
at night higher than ambi-
ent temperature.
no yes
Check the return flow
preventer in feed flow and
return flow with regard to
the functional efficiency.
Is store insulation suffi-
cient?
yes no
Intensify the insulation.
Is store insulation close
enough to the store?
yes no
Replace or intensify the
insulation.
Are the store connec-
tions insulated?
yes no Insulate connections.
Warm water outflow
upwards?
no yes
Change connection and
let the water flow side-
wards or through a siphon
(bow downwards); less
store losses now?
Does warm water circu-
lation run for a very long
time?
no yes
Use the circulation pump
with timer and switch-off
thermostat (energy effici-
ent circulation)
The solar circuit pump does not work although the colle-
ctor is obviously warmer than the store.
Does the pump start up
in manual operation?
yes
The adjusted tempe rature
difference for starting the
pump is too high; choose
an matching setting
no
Is the current of the
pump released by the
controller?
yes
Is the pump stuck?
Turn the pump shaft using
a screwdriver; is it passa-
ble now ?
Is the pump defective -
replace it.
Are the fuses of the
controller o.k.?
Controller might be de-
fective - replace it.
no yes
no
no yes
Replace the fuses.
Switch-off the circulation
pump and the blocking
valve for 1 night; less store
losses?
yes no
Check the pumps of the
after-heating circuit accor-
ding to nightly run and de-
fect return flow preventer;
problem solved?
no
no yes
o.k.
Control the return flow
preventer in warm water
circulation- o.k.
yes no
Please also check further
pumps which are con-
nected to the solar store.
The gravitation circu lation
in the circulation line is
too strong; insert a stron-
ger return flow pre venter
or an electrical 2-way val-
ve behind the circulation
pump; the 2-way valve is
open in pump operati-
on, other wise it is closed,
conect pump and 2-way
Cleaning or replacement.
valve in parallel; activate
the circulation again!
a
a b
b

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6. Accessory
Overvoltage protection
We highly recommend to install the RESOL overvoltage
protection in order to avoid overvoltage damages at the
collector (e.g. by lightening).
Sensors
Our product range includes high-precision platin tempera-
ture sensors, fl atscrew sensors, ambient temperature sen-
sors, indoor temperature sensors, cylindrical clip-on sensors
and irradiation sensors, also to be used as full sensors with
sensor pocket..

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Distributed by:
Please note:
The design and the specifications are to be changed without notice.
The illustrations may differ from the original product.
RESOL - Elektronische Regelungen GmbH
Heiskampstraße 10
45527 Hattingen / Germany
Tel.: [phone] / 96 48 - 0
Fax: [phone] / 96 48 - 755
www.resol.com
[e-mail]
Reprinting / copying
This mounting- and operation manual including all parts is
copyrighted. Another use outside the copyright requires
the approval of RESOL - Elektronische Regelungen GmbH.
This especially applies for copies, translations, micro films
and the storage into electronic systems.
Editor: RESOL - Elektronische Regelungen GmbH
Important notice:
We took a lot of care with the texts and drawings of this
manual and to the best of our knowledge and consent. As
faults can never be excluded, please note: Your own calcu-
lations and plans, under consideration of the current stan-
dards and DIN-directions should only be basis for your
projects. We don´t offer a guarantee for the completeness
of the drawings and texts of this manual - they only repre-
sent some examples. They can only be used at your own
risk. No liability is assumed for incorrect, incomplete or
false information and / or the resulting damages.