Caleffi solar iSolar 3 User manual

Thanks for buying this product.
Read this manual carefully to get the best perfomance from this unit.
Mounting
Connection
Handling
Fault localization
Examples
manual
49005100
*49005100*

© 07127 isolar3.monus.indd
|2
Contents
Imprint .................................................................................2
Security devices...................................................................2
Technichal data and function survey .................................3
1. Installation .............................................................4
1.1 Mounting.................................................................................. 4
1.2 Electrical wiring...................................................................... 4
1.2.1 Standard solar system........................................................... 5
1.2.2 Solar system and after-heating............................................ 5
2. Operation and function ........................................6
2.1 Adjustment buttons .............................................................. 6
2.2 System monitoring display ................................................... 6
2.2.1 Channel indication................................................................. 6
2.2.2 Tool bar.................................................................................... 6
2.2.3 System screen......................................................................... 7
2.3 Blinkcodes ............................................................................... 7
2.3.1 System-Screen Blinkcodes ................................................... 7
2.3.2 Blinking codes......................................................................... 7
3. Commissioning......................................................8
4. Control parameter and indication channels ......8
4.1 Channel overview.................................................................. 8
4.1.1-6 Indication channels ................................................................ 9
4.1.7-18 Adjustment channels...........................................................10
5. Tips for fault localization....................................13
5.1 Miscellaneous........................................................................ 14
6. Accessory .............................................................16
Reprinting / copying
This mounting- and operation manual including all parts is
copyrighted.Another use outside the copyright requires
the approval of CALEFFI NORTH AMERICA, Inc..This
especially applies for copies, translations, micro films and
the storage into electronic systems.
Editor: CALEFFI NORTH AMERICA, Inc.
Important notice:
We took a lot of care over 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 calculations and plans under consideration of
the current norms 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 represent some examples.They can only be
used on own risk. No liability is assumed for incorrect,
incomplete or false information and the resulting damages.
Errors an technical changes excepted.
Safety regulations:
Please read the following information carefully before
installing and operating the controller. In this way damage to
the solar system by wrong installation will be avoided.Please
observe that the mounting is adapted to the characteristics
of the building, that the local regulations are respected and
is conform with the technical rules.
CU 72060171 01
UL 60730-1A:2002
CSA E60730.1:2002
US
US
C
C

© 07127 isolar3.monus.indd
3 |
!



• system-monitoring-display
• upto4temperaturesensors
Pt1000
• heatbalancing
• functioncontrol
• user-friendlyoperationby
simple handling
• solaroperatinghourscounter
and thermostat function optio-
nally
Scope of delivery:
1 x ISOLAR 3
1 x accessory bag
1 x spare fuse T4A
2 x screws and dowels
4 x strain relief and screws
Additionally enclosed in the full kit:
1 x sensor FKP6
2 x sensor FRP6
Technical data
Housing:
plastic, PC-ABS and PMMA
Protection type: IP 20 / DIN 40050
Environmental temp.: 32 ... 104 °F
Size: 172 x 110 x 46 mm
Mounting: wall mounting, mounting
into patch-panels is possible
Display: System screen for sys-
tems visualisation, 16-segment display,
7-segment display,8 symbols for system
status and operating control lamp
Operation: by 3 pushbuttons in the
front of the housing
Functions: Temperature differential
controller with optional add-on system
funtcions. Function control according,
operating hours counter for solar
pump, tube collector special function,
as well as heat quantity balancing.
Inputs: for 4 temperature sensors
Pt1000
Outputs: 2 electromechanical relay
Bus: VBus®
Power supply:
115 V~
Total power supply:
2 (1) A 115V~
Mode of operation:
Typ 1.b
Breaking capacity per relay:
electromechanical relay:
2 (1) A 115V~

© 07127 isolar3.monus.indd
|4
display
pushbutton
can fuse 4A
cable conduits with strain
relief
cover
1.1 Mounting
The unit must only be located internally. It is not suitable
for installation in hazardous locations and should not be
sited near to any electromagnetic field.The controller must
additionally be equipped with an all-polar gap of at least 3 mm
or with a gap according to the valid installaton regulations,
e.g. LS-switches or fuses. Please pay attention to a separate
laying of the cable lines and installation of ac power supply.
1. Unscrew the cross-recessed screw of the cover and
remove it from the housing.
2. Mark the upper fastening point on the wall and premount
the enclosed dowel and screw.
3. Hang up the housing at the upper fastening point and mark
the lower fastening point on the underground (hole pitch
130 mm), afterwards put the lower dowel.
4. Fasten the housing at the underground.
1. Installation Warning!
Switch-off power supply before
opening the housing.
1.2 Electrical wiring The power supply to the controller must only be made by
an external power supply switch (last step of installation!)
and the line voltage must be 115 Volt (50...60 Hz). Flexible
lines are to be fixed at the housing by enclosed strain relief
supports and screws.
Depending on the version the controller is equipped with
2 relays to which the consumers e.g. 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 up to S4) will be connected
to the following terminals independently of the polarity:
1 / 2 = Sensor 1 (e.g. Sensor collector 1)
3 / 4 = Sensor 2 (e.g. Sensor tank 1)
5 / 6 = Sensor 3 (e.g. Sensor TSPO)
7 / 8 = Sensor 4 (e.g. Sensor TRL)
The power supply is effected to the clamps:
19 = neutral conductor N
20 = conductor L
12 = ground clamp
hanging
fixation
Electrostatic discharge can lead to damages of elec-
tronic components!
Dangerous voltage on contact!
net clamps
fuse
consumer clamps
Sensor clamps earthing clamps
VBus®
The controller comes with aVBus®for data communication
and energy supply of external modules. The connection
is effected with optional polarity at the clamps marked
with„VBus®“.Via this data Bus you can install one or more
VBus®modules, e.g.:
• heat quant. measurement module WMZ-M1
• large display GA3
• Data logger, DL1
• Data teleindication, DFA2
Additionaly, the controller can be connected to the PC with
the help of a RS-COM adapter. With the ServiceCenter
Software (RCS) the controller parameters can be changed,
measurements can be read out, processed and visualised.
The software enables an easy function control and adjust-
ment of the system.

© 07127 isolar3.monus.indd
5 |
S1
S2
S4 / TRF
1.2.1 Allocation of clamps for system 1 Standard solar system with 1 tank, 1 pump and 3 sen-
sors. The sensor S4 / TRF can optionally be used for heat
quantity balancing.
R1
Arr 1
S3
R2
S1
S2
R1 S3
S4 / TRF
Solars ystem and after-heating with 1 tank, 3 sensors
and after-heating.The sensor S4 /TRF can optionally be used
for heat quantity balancing.
Arr 2
1.2.2 Allocation of clamps for system 2
Symbol Specification
S1 collector sensor
S2 tank sensor below
S3 tank sensor at the top
S4 / TRF sensor for heat quantity
balancing (optionally)
R1 solar pump
R2 pump for heat exchange
Symbol Specification
S1 Collector sensor
S2 Tank sensor below
S3 Tank sensor at the top
(optionally)
S4 / TRF Sensor for heat quantity
measurement (optionally)
R1 Solar pump

© 07127 isolar3.monus.indd
|6
1
3
2
backwards forward
SET
(selection / adjustment mode)
The system monitoring display consists of 3 blocks: indica-
tion of the channel, tool bar and system screen (active
system scheme).
The indication channel consists of two lines.The upper
line is an alphanumeric 16-segment indication in which mainly
the channel names / menu items are shown. In the lower
7-segment indication,the channel values and the adjustment
parameters are indicated.
Temperatures and temperature differences are indicated in
°F / °C or Ra / K.
2.2.1 Channel indication
only channel indication
2.2.2 Tool bar
The additional symbols of the tool bar indicate the current
system status.
only tool bar
2. Operation and function
2.1 Pushbuttons for adjustment
The controller is operated by 3 pushbuttons below the
display. The forward-key (1) is used for scrolling forward
through the indication menu or to increase the adjustment
values. The backwards-key (2) is accordingly used for the
reverse function.
For adjustment of last indication channel, keep button 1
pressed for 2 seconds.If an adjustment value is shown on
the display, SEt is indicated. In this case you can press the
key „Set“ (3) in order to change into input mode.
Select a channel by keys 1 and 2
Shortly press key 3, so that „SEt“ flashes
Adjust the value by keys 1 and 2
Shortly press key 3, so that „SEt“ permanently appears,
the adjusted value is now saved.
2.2 System monitoring display
!



Complete Monitoring-Display
Symbol standard flashing
relay 1 active
relay 2 active
maximum tank limitation
active / maximum tank
temperature exceeded
collector cooling function or
reccoling function active
antifreeze- function activated collector minimum limitation
or antifreeze function active
collector security shutdown or
tank securtiy shutdown active
+ sensor defect
+ manual operation active
an adjustment channel is
changed SET-mode

© 07127 isolar3.monus.indd
7 |
The system screen (active system scheme) shows the
schemes selected on the controller. It consists of several
system component symbols, which are - depending on the
current status of the system - either flashing, permanently
shown or hidden.
Sensor
Collector 1
Pumps
Additional symbol for
operation of the burner
Tank
Tank heat exchanger Tank 2 or after-heating (with
additional symbol)
Sensor tank top
Collectors
with collector sensor
Pump
3-way-valves
The flow direction or the current bre-
aking capacity are always shown.
Heating circuit
Tank 1 and 2
with heat exchanger
After-heating
with burner symbol
Temperature sensor
2.2.3 System screen
only system screen
Constantly green: everything all right
Red/green blinking: initialisation phase
manual operation
Red blinking: sensor defect
(sensor symbol is quickly blinking)
2.3 Blinking codes
2.3.2 LED blinking codes
2.3.1 System screen blinking codes
•Pumps are blinking during starting phase
•Sensors are blinking if the respective sensor-indication
channel is selected.
•Sensors are quickly blinking in case of sensor defect.
•Burner symbol is blinking if after-heating is activated.

© 07127 isolar3.monus.indd
|8
3. Commissioning
On commissioning you have to adjust primarily the matching system
System survey:
Arr 1 : standard solar system
Arr 2 : solar system with after-heating
1
3
2
backwards forward
SET
(Selection / Adjustment mode)
Operation cont-
rol lamp
Arr 1 Arr 2
1.Ac power supply must be activated.The controller passes
an initialisation phase in which the operating control lamp
flashes red and green.After having finished the initialisation,
the controller is in automatic operation with factory set-
tings.The preadjusted system scheme is Arr 1.
2. - select Arr
- change into -mode (see 2.1)
- select the system scheme by Arr-characteristics
- adjustment is saved by pressing button
Now the controller is ready for operation and should enable
an optimum operation of the solar system by the factory
settings made.
4. Controller parameter and indication channels
4.1 Channel-overview
Legend:
x
Corresponding channel is available.
x*
Corresponding channel is available if the appropriate option
is activated.

Corresponding channel is only available if the option heat
quantity measurement is activated (OWMZ).
MEDT
The channel antifreeze content (MED%) is only shown if a
medium other than water orTyfocor LS / G-LS (MEDT
0 or 3) is used.The adjustment is only appropriate when
using other types of antifreeze.

Corresponding channel is only available if the option heat
quantity measurement is deactivated (OWMZ).
Please note:
S3 and S4 are only indicated if sensors are connected.
channel Arr specification page
1 2*
COL x x Temperature collector 1 9
TST x Temperature tank 1 9
TSTL x Temperature tank 1 below 9
TSTU x Temperature tank 1 above 9
S3 x Temperature sensor 3 9
TRF   Temperature return sensor 9
S4   Temperature sensor 4 9
h P1 x Operating hours relay 1 9
h P2 x Operating hours relay 2 9
kWh   Heat quantity kWh 10
MWh   Heat quantity MWh 10
Arr 1-2 System 8
DT O x x Switch-on temperature difference 10
DT F x x Switch-off temperature difference 10
S MX x x Maximum temperature tank 1 10
EM x x emergency temperature collector 1 10
channel Arr specification page
1 2*
OCX x x Option collector cooling collector 1 11
CMX x* x* Maximum temperature collector 1 11
OCN x x Option minimum limitation collector1 11
CMN x* x* Minimun temperature collector 1 11
OCF x x Option antifreeze collector 1 11
CFR x* x* Antifreeze temperature collector 1 11
OREC x x Option reccoling 11
O TC x x Option tube collector 12
AH O x Switch-on temp. for thermostat 1 12
AH F x Switch-off temp. for thermostat 1 12
OHQM x x Option WMZ 12
FMAX   Maximum flow 12
MEDT   Antifreeze type 10
MED% MEDT MEDT Antifreeze content 10
HND1 x x Manual operation relay 1 12
HND2 x x Manual operation relay 2 12
LANG x x Language 12
UNIT x x Change over °FAH / °CEL 12
PROG XX.XX Program number
VERS X.XX Version number

© 07127 isolar3.monus.indd
9 |
4.1.1 Indicataion of collector temperatures
4.1.2 Indication of tank temperatures
4.1.3 Indication of sensor 3 and sensor 4
4.1.4 Indication of other temperatures
4.1.5 Operating hours counter
Shows the current collector temperature.
•COL : collector temperature (1-collector-system)
COL:
Collector temperature
display range: -40 ...+482 °F
Shows the current tank temperature.
•TST : tank temperature (1-tank-system)
TST:
Tank temperatures
Display range: -40 ...+482 °F
Shows the current temperature of the corresponding addi-
tional sensor (without control function).
•S3 : temperature sensor 3
•S4 : temperature sensor 4
Please note:
S3 and S4 are only indicated if the temperature sensors
are connected (shown).
S3, S4:
Sensor temperatures
Display range: -40 ...+482 °F
Shows the current temperature of the sensor.
•TRF : temperature return flow
TRF:
other measured
temperatures
Display range: -40 ...+482 °F
h P1, h P2:
Operating hours counter
Display channel
The operating hours counter adds up the solar operating
hours of the respective relay (h P). Full hours are shown
on the display.
The operating hours added up can be reset. As soon as
one operating hours channel is selected, the symbol in
permanently shown on the display.The button SET (3) must
pressed for approx. 2 seconds in order to get back into
the RESET-mode of the counter.The display-symbol is
flashing and the operating hours will be set to 0.In order to
finish the RESET-procedure, the button must be pressed
in order to confirm.
In order to interrupt the RESET-procedure, no button
should be pressed for about 5 seconds.The controller re-
turns automatically into the indicaton mode.
4.1.6 Heat quantity balancing
OHQM:Heat quantity balan-
cing
Adjustment range: OFF...ON
Factory setting: OFF
A heat quantity balancing is possible for all systems in
conjunction with a flowmeter.You just have to activate the
option heat quantity balancing in the channel OHQM.
The volume flow readable at the flowmeter (l/min) must
be adjusted in the channel FMAX. Antifreeze type and
concentration of the heat transfer medium are indicated on
the channels MEDT and MED%.
FMAX:
Volume flow in l/min
Adjustment range 0 ... 20
in steps of 0,1
Factory setting 6,0

© 07127 isolar3.monus.indd
|10
4.1.7 ∆T-regulation
Type of antifreeze:
0 : water
1 : propylene glycol
2 : ethylene glycol
3 : Tyfocor® LS / G-LS
kWh/MWh:Heat quantity
in kWh / MWh
Display channel
MEDT: Type of antifreeze
Adjustment range 0 ... 3
Factory setting 1
MED%: Concentration of
antifreeze in (Vol-) %
MED% is blinded out by
MEDT 0 and 3.
Adjustment range 20 ... 70
Factory setting 45
The heat quantity transported is measured by the indication
of the volume flow and the reference sensor of feed flow
S1 and return flow S4. It is shown in kWh-parts in the in-
dication channel kWh and in MWh-parts in the indication
channel MWh. The sum of both channels form the total
heat output.
The heat quantity added up can be reset. As soon as one
of the display channels of the heat quantity is selected, the
symbol is permanently shown on the display.The button
SET (3) must be pressed for approx. 2 seconds in order to
get back into the RESET-mode of the counter.The display-
symbol is flashing and the value for heat quantity will be
set to 0. In order to finish the RESET-procedure, the button
must be pressed for confirmation.
In order to interrupt the RESET-procedure, no button
should be pressed for about 5 seconds.The controller re-
turns automatically into indication mode.
Please note: Switch-on temperature difference DO must
be at least 2 °Ra higher than the switch-off temperature-
difference DF.
DT O:
Switch-on temperature
Adjustment range
2,0 ... 40,0 °Ra
Factory setting 12.0
DT F:
Switch-off temperature diff.
Adjustment range
1,0 ... 38 °Ra
Factory setting 8.0 °Ra
Primarily the controller works in the same way as a standard
differential controller. If the switch-on difference (DT O)
is reached, the pump is activated. If the adjusted switch-off
temperature is underrun (DT F), the controller switches-
off.
4.1.8 Maximum tank temperature
If the adjusted maximum temperature is exceeded,a further
loading of the tank is stopped so that a damaging overheating
can be avoided. If the maximum tank temperature is
exceeded, on the display is shown and .
Please note: The controller is equipped with a security-
switch-off of the tank, which avoids a further loading of the
tank if 203 °F are reached at the tank.
S MX:
Maximum tank temp.
Adjustment range
40 ... 205 °F
Factory setting 140 °F
4.1.9 Limit collector temperature
Collector emergency shutdown
If the adjusted collector limit temperature (EM) is exceeded,
the solar pump (R1/R2) is deactivated in order to avoid a
damaging overheating of the solar components (collector
emergency shutdown). The limit temperature is set to
285 °F but it can be changed within the adjustment range of
230 ... 400 °F. In the display is shown (flashing).
EM:
Limit collector temperature
Adjustment range
230 ... 400 °F,
Factory setting 285 °F

© 07127 isolar3.monus.indd
11 |
4.1.10 System cooling
CMX:
Maximum collector temp.
Adjustment range
210 ... 380 °F
Factory setting 250 °F
If the adjusted maximum tank temperature is reached, the
solar system switches-off. If now the collector temperature
raises to the adjusted maximum collector temperature
(CMX), the solar pump remains activated until this limit
temperature value is again underrun.The tank temperature
might continue to raise (subordinated active maximum
tank temperature), but only until 203 °F (emergency shut-
down of the tank). If the tank temperature is higher than
the maximum tank temperature (S MX) and the collector
temperature is lower by at least 5 K than the tank tempe-
rature, the solar system remains activated until the tank is
again cooled down by the collector and the tubes under the
adjusted maximum temperature (S MX).
In case of active system cooling on the display is shown
(flashing). Due to the cooling function the solar system can
be kept operable for a longer period on hot summer days
and a thermal release of the collector and the heat transfer
medium is ensured as well.
OCX:
Option system cooling
Adjustment OFF ... ON
Factory setting ON
4.1.11 Option minimum collector limitation
CMN:
Minimum collector tempera-
ture Adjustment range
14 ... 32 °F
Factory setting 50 °F
OCN:
Mimimum collector limitation
Adjustment range OFF / ON
Factory setting OFF
The minimum collector temperature is a minimum switching
temperature, which must be exceeded so that the solar
pump (R1/R2) is switched-on. The minimum temperature
shall avoid a steady starting-up of the solar pump (or solid
fuel boiler charging pumps) for low collector temperatures.
If the minimum temperature is underrun, in the display is
shown (flashing).
4.1.13 Recooling function
4.1.12 Option antifreeze function
CFR:
Antifreeze temperature
Adjustment range
14 ...50 °F
Factory setting 40 °F
OCF:
Antifreeze function
Adjustment range
OFF / ON
Factory setting OFF
The antifreeze function activates the loading circuit bet-
ween collector and tank if the adjusted antifreeze function
is underrun in order to protect the medium that it will not
freeze or „get thick“. If the adjusted antifreeze temperature
is exceeded by 2 °F, the loading circuit will be deactivated.
Please note:
As there is only a limited heat quantity of the tank available
for this function,the antifreeze function should only be used
in regions with few days of temperatures around freezing
point.
If the adjusted maximum tank temperature (S MX)
is reached, the solar pump remains activated in order
to avoid an overheating of the collector. The tank
temperature might continue to increase but only up to
203 °F (emergency shutdown of the tank).
In the evening the solar system continues running until
the tank is cooled down to the adjusted maximum tank
temperature via collector and pipes.
OREC:
option recooling
adjustment range
OFF ...ON
Factory setting: OFF

© 07127 isolar3.monus.indd
|12
4.1.14 Tube collector special function
If the controller measures an increase of 4 °Ra compared
to the collector temperature tankd at last, the solar
pump is switched-on to 100 % for about 30 seconds.
After expiration of the solar pump runtime the current
collector temperature is tankd as new reference value. If
the measured temperature (new reference value) is again
exceeded by 4 °Ra,the solar pump again switches-on for 30
seconds. If the switch-on difference between collector and
tank is again exceeded during runtime of the solar pump
or the standstil of the system, the controller automatically
switches over to solar charging.
If the collector temperature drops by 4 °Ra during standstill,
the switch-on value for the special tube collector function
will be recalculated.
O TC:
Tube collector special
function
Adjustment range:
OFF ...ON
Factory setting: OFF
The thermostat function works independently from the solar
operation and can e.g. be used for use of surplus energy or
an after-heating.
• AH O < AH F
the thermostat function is used for after-heating
• AH O > AH F
the thermostat function is used for use of surplus
energy
On the display is shown if the second relay output is
activated.
4.1.15Thermostat function
(Arr = 2)
after-heating use of surpluse energy
AH O:
Thermostat-switch-on
temperature
Adjustment range:
32 ...203 °F
Factory setting: 104 °F
AH F:
Thermostat-switch-off tem-
perature
Adjustment range:
32 ...203 °F
Factory setting: 113 °F
For control and service work the operating mode of the
controller can be manually adjusted by selecting the adjust-
ment value HAND, in which the following adjustments can
be made:
4.1.16 Operating mode
• HAND
Operating mode
OFF : relay off (flashing) +
AUTO : relay in automatic operation
ON : relay on (flashing) +
HAND1,HAND2:
Operating mode
Adjustment range:
OFF,AUTO, ON
Factory setting:AUTO
4.1.17 Language
The menu language can be adjusted in this channel.
• dE : German
•En : English
• It : Italiano
• Fr : French
LANG:
Adjustment of language
Adjustment range: dE, En, It
Factory setting: En
4.1.18 Unit
The menu unit can be adjusted:
• °FAH
•°CEL
UNIT:
Adjustment of unit
Adjustment range: FAH, °C
Factory setting: FAH

© 07127 isolar3.monus.indd
13 |
5.Tips for fault localization
can fuse T4A If a malfunction occurs, a notification is given on the display
of the controller:
Operating control lamp
Warning symbol
Operating control lamp offOperating control lamp flashes red. On the display the
symbols and appear.
°F W°F W
14 961 131 1213
23 980 140 1232
32 1000 149 1252
41 1019 158 1271
50 1039 167 1290
59 1058 176 1309
68 1078 185 1328
77 1097 194 1347
86 1117 203 1366
95 1136 212 1385
104 1155 221 1404
113 1175 230 1423
122 1194 239 1442
Resistance values of the
Pt1000-sensors
Check the power supply
o.k.
The can fuse of the controller is defective.
It can be replaced after removal of the
front cover (spare fuse is enclosed in the
accessory bag).
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 sensors pinched
off can be checked with an ohmmeter.
In the following the resistance values
corresponding to different temperatures
are listed.

© 07127 isolar3.monus.indd
|14
5.1Various:
Pump starts for a short moment, switches-on/off
reapeatedly
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 stops working soon. The temperature difference between tank and collector
increases enormously during operation; the collector cir-
cuit cannot dissipate the heat.
Collector circuit pump
defect ?
no yes
Heat exchanger calcified?
yes
Repair / Replace
Decalification
no
Heat exchanger plugged?
yesno
Cleaning
Heat exchanger too
small?
yes
New calculation of the
dimension.
no
Plausibility control of the
option tube collector spe-
cial function
Change∆Ton and ∆Toff
accordingly.
Switch-on-temperatu-
re difference ∆Ton too
large?
no yes
Collector sensor unfavour-
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 tank, feed flow and return flow are equally warm,
possibly also bubble in the tubes
Exhaust the system; incre-
ase system pressure to at
least static primary pres-
sure plus 0,5 bar; if neces-
sary continue to increase,
switch the pump on and
off for a short time
Air in the system?
no yes
Is the collector circuit
blocked at the dirt trap?
yes
Clean the dirt trap
If necessary activate tube
collector function.
yes
o.k.

© 07127 isolar3.monus.indd
15 |
a b
Tanks 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 the tank insulation
sufficient?
yes no Intensify the insulation.
Is the tank insulation clo-
se enough to the store?
yes no
Replace or intensify the
insulation.
Are the tank connections
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
tank 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 effi-
cient circulation)
The solar circuit pump does not work although the coll-
ector is obviously warmer than the tank.
Does the control LED
flash?
yes no
Does the pump start up
in manual operation?
yes
There is no current;check
fuses / replace them and
check power supply.
The adjusted temperature
difference for starting the
pump is too high; choose
a matching setting
no
Is the current of the
pump released by the
controller?
yes
Is the pump stuck?
Put the pump into operati-
on by means of a screwdri-
ver; is it passable now ?
Is the pump out of order?
- replace if necessary
Are the fuses o.k.?
Controller seems to be
defective - replace it.
no yes
no
no yes
Replace the fuses.
Switch-off the circulation
pump and the blocking
valve for 1 night; less tank
losses?
yes no
Check the pumps of the
after-heating circuit ac-
cording to nightly run and
defect return flow preven-
ter; 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 connec-
ted to the solar tank.
The gravitation circulation
in the circulation line is
too strong; insert a stron-
ger return flow preventer
or an electrical 2-way val-
ve behind the circulation
pump; the 2-way valve is
open in pump operati-
on, otherwise it is closed,
conect pump and 2-way
valve in parallel; activate
the circulation again!
Cleaning or replacement.
a
a b
b

© 07127 isolar3.monus.indd
|16
Distributed by:
Please note:
The design and the specifications are to be changed without notice.
The illustrations may differ from original product.
6.Accessory
Overvoltage protection
We highly recommend to install the overvoltage protection
in order to avoid overvoltage damages at the collector (e.g.
by lightening).
Sensors
Our product range includes high-precision platin temperatu-
re sensors, flatscrew sensors, ambient temperature sensors,
indoor temperature sensors, cylindrical clip-on sensors
and irradiation sensors, also to be used as full sensors with
sensor pocket.
Flowmeter
If you are interested in realising a heat quantity balancing,
you need a flowmeter for measuring the volume flow in
your system.
CALEFFI NORTH AMERICA, Inc.
3883 W. Milwaukee Rd.
Milwaukee,WI 53208
Tel.: [phone]
Fax: [phone]
www.caleffi.us
sales@caleffi.com