Thermo Technologies USDT 3002 Instruction manual

USDT 3002
Thanks for buying.
Read this manual carefully to get the best perfomance from this unit.
USDT 3002
Unit Mounting
Power Connections
Operation
Troubleshooting
manual

USDT 3002
© 06279 usdt_3002.monus.indd
| 2
Contents
Copyright. .............................................................................2
Safety Regulations ...............................................................2
Technical data and unit capacity ........................................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 with 2nd relay. ................................................ 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 Blinking codes ......................................................................... 7
2.3.1 System-Screen Blinking codes ............................................. 7
2.3.2 LED Blinking codes ................................................................ 7
3. Activating the Operating System ........................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 manual including all parts is copyrighted. Any
use outside of the copyright requires the approval of
Thermo Technologies. This especially applies for copies,
translations, micro films and electronic storage media.
Editor: Thermo Technologies
Important notice:
Accuracy of all texts and drawings in this manual are to
the best of Thermo Technologies knowledge and consent.
The information and illustrations contained in this manual
should act only as a reference point and in no way replace
the user‘s own calculations and plans.
No liability is assumed for incorrect, incomplete or false
information and the resulting damages.
Errors and technical changes excepted.
Safety regulations:
Please read the following information carefully before
installing and operating the controller. This will avoid damage
to the solar system by incorrect installation. Mounting should
be adapted to the characteristics of the building and conform
to all state and federal regulations.
CU 72060171 01
UL 60730-1A:2002
CSA E60730.1:2002
US
US
C
C

USDT 3002
© 06279 usdt_3002.monus.indd
3 |
!



• System status diagnostics
• Symbolic display of all para-
meters
• Up to 4 temperature sensors
Pt1000
• Manual override of pump for
system testing
• Two Relay Outputs
• Adjustable factory settings of
Delta T
• Flow meter capability
• Simple 3-Button operation
• Emergency collector shut-off
temperature
• Solar operating hours counter
• Energy collection measure-
ments
Package includes:
1 x USDT 3002
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
Unit Externals
Housing:
plastic, PC-ABS and PMMA
Protection type: IP 20 / DIN 40050
Environmental temp.: 0 ... 104 °F
Size: 172 x 110 x 46 mm
Mounting: wall mounting, mounting
into patch-panels is possible
Power supply:
115 V~
Total power supply:
2 x 1 A
Mode of operation:
Typ 1.b
Breaking capacity per relay:
electromechanical relay:
2 x 1 A
At the factory, USDT 3002 is set
to control a standard solar water
heating system with an auxiliary relay
to divert surplus heat. The auxiliary
relay can be used to maintain the
tank temperature, protect the system
from overheating or provide another
heat source to heat the storage tank.
The controller has inputs for four
PT1000-sensors.
The fourth sensor may be used as
for an additional temperature reading
or for a flow meter. A 3-key-panel
below a large LCD serves as the
user interface. Simple icons give
information about the function and
operational mode of the controller
and the system performance.

USDT 3002
© 06279 usdt_3002.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 suited
for installation in hazardous locations and should not be
sited near an electromagnetic field. The controller must
be positioned 1/8" from walls, 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
5"5 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 be via 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.
The controller is equipped with 2 relays for connection
to system counterparts e.g. pumps, valves etc. can be con-
nected:
• 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 terminals are:
19 = neutral conductor N
20 = conductor L
12 = ground clamp
hanging
fixation
Electrostatic discharge can damage electronic
components
Dangerous voltage on contact
1 2
S1 S2 S3
3456
Temp. Sensor
Pt1000
LNR1NR2N
201918171615
S4
7 8 141312
2 (1) A 115
2
V~
(1) A 115 V~
R1
R2
T4A
115 V~
net clamps
fuse
consumer clamps
Sensor clamps earthing clamps

USDT 3002
© 06279 usdt_3002.monus.indd
5 |
S1
S2
S4 / TRF
1.2.1 Allocation of terminals for system 1 Standard solar system with 1 tank, 1 pump and 3 sensors.
The sensor S4 / TRF can optionally be used for a flow meter
or 4th temperature sensor
R1
Arr 1
S3
R2
S1
S2
R1 S3
S4 / TRF
Solars system with 1 tank, 3 sensors and 2nd relay (R2).
The sensor S4 / TRF can optionally be used fas a flow meter
or a 4th temperature sensor.
Arr 2
1.2.2 Allocation of terminals for system 2 (Arr 2)
Symbol Specification
S1 collector sensor
S2 tank sensor below
S3 tank sensor at the top
S4 / TRF optional sensor for flow
- meter/additional tempe-
rature input
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 4th s ensor for or flow
meter (optionally)
R1 Solar pump

USDT 3002
© 06279 usdt_3002.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. This displays
the channel names / menu items. In the lower 7-segment
indication, the channel values and the adjustment parameter
are indicated.
Temperatures and temperature differences are indicated
in or .
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
2.1 Pushbuttons for adjustment
The controller is operated by the 3 buttons 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.
Select a channel channel using the forward/back keys (1
and 2). Briefly press the center key, so that „SEt“ flashes
Adjust the value using the foward/back keys
then briefly press the center key, so that „SEt“
permanently appearsThe adjusted value is now saved.
Additional channels (i.e. manual operation of pump,
activation of 2nd relay, cooling etc.) become available by
holding down the forward key (1) for two seconds
2.2 System monitoring display
!



Complete Monitoring-Display
Symbol standard flashing
relay 1 active
relay 2 active
maximum tank temperature
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

USDT 3002
© 06279 usdt_3002.monus.indd
7 |
The system screen (active system scheme) displays the full
system operation. It consists of several system component
symbols, which are - depending on the current status of the
system - either flashing, permanently displayed or hidden.
Sensor
Collector 1
Pumps
Additional symbol for
operation of the burner
Tank
Tank heat exchanger Tank 2 or or 2nd relay option
(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: System functioning correctly
Red/green blinking: blinking initialisation phase of manual
operation
Red blinking: sensor defect
2.3 Blinking codes
2.3.2 LED blinking codes
2.3.1 System screen blinking codes
• Pumps blink during starting phase
• Sensors blink if the respective sensor-indication channel
is selected.
• Sensors blink rapidly in case of sensor defect.
• Burner symbol blinks if 2nd relay is activated

USDT 3002
© 06279 usdt_3002.monus.indd
| 8
3. Activating the Operating System
User has the option of a one or two relay system
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. At this point the controller is in au-
tomatic operation with factory settings.
Arr 1. Controller is ready for operation o the user may
activate the 2nd relay:
2. - Arr 2: Extended Solar System (with second relay)
-locate Arr by holding down forward key for 2 seconds
-press center key to begin set
-increase to Arr 2 using forward key
-press center key to save adjustment
Now the controller is ready for operation.
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 or Tyfocor 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

USDT 3002
© 06279 usdt_3002.monus.indd
9 |
4.1.1 Indication 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
Displays the current collector temperature.
• COL : collector temperature (1-collector-system)
COL:
Collector temperature
display range: -40 ... +482 °F
Displays the current tank temperature.
• TST : tank temperature (1 relay)
• TSTL/U: tank temperature (2 relays)
TST:
Tank temperatures
Display range: -40 ... +482 °F
Displays the current temperature of the corresponding
additional sensor (without control function).
• S3 : temperature sensor 3
• S4 : temperature sensor 4
Note:
S3 and S4 are only indicated if the temperature sensors
are connected (shown).
S3, S4:
Sensor temperatures
Display range: -40 ... +482 °F
Displays the current temperature of the connected sensor.
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). Completed hours are
shown on the display and may be reset back to 0. Select the
operating hours channel (h P). The center button 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. Press the center button again to save
the adjustment.
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 Measuring Collected Energy
OHQM:Energy Collection
Measuring
Adjustment range: OFF ... ON
Factory setting: OFF
The unit may be used in conjunction with a flow meter for
energy collection calculations. This option is activated in the
channel OHQM.
The parameters of 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

USDT 3002
© 06279 usdt_3002.monus.indd
| 10
4.1.7 ∆ Delta T Adjustment
Type of antifreeze:
0 : water
1 : propylene glycol
2 : ethylene glycol
3 : Tyfocor® LS / G-LS
kWh/MWh: Collected
Energy 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 transportation of collected energy is measured by the
volume flow (S1) and the return flow (S4). These references
are displayed in both kWh and MWh in their respective
channels. The sum of all channels = total heat output.
As soon as one of the display channels of the collected
energy is selected, the symbol is permanently shown
on the display. The center button (SET) must be pressed for
approx. 2 seconds in order return to RESET-mode of the
counter. The display-symbol is flashing and the energy
value will be set to 0.
Pressing the center button again saves the adjustmentIf
adjustments are not made within 5 seconds the RESET pro-
cedure is interrupted. The controller returns 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 damage
through 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 Emergency Shutdown of Collector
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 may be changed within the adjustment range of
230 ... 400 °F. This is displayed as (flashing).
EM:
Limit collector temperature
Adjustment range
230 ... 400 °F,
Factory setting 285 °F

USDT 3002
© 06279 usdt_3002.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. At this point 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, but only until 203 °F
(emergency shutdown 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 temperature, 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 OFF
4.1.11 Minimum collector temperature option
CMN:
Minimum collector tempera-
ture Adjustment range
14 ... 32 °F
Factory setting 50 °F
OCN:
Adjustment range OFF / ON
Factory setting OFF
The minimum collector temperature 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 Antifreeze function option
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. The adjusted antifreeze function is
underrun in order to protect the medium from freezing or
thickening. If the adjusted antifreeze temperature is excee-
ded by 2 °F, the loading circuit will be deactivated.
Note:
As there is only a limited amount of heat in the tank 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:
Recooling
adjustment range
OFF ... ON
Factory setting: OFF

USDT 3002
© 06279 usdt_3002.monus.indd
| 12
4.1.14 Tube collector special function
If the controller measures an increase of 4 °Ra compared
to the recorded collector temperature the solar pump is
switched-on to 100 % for about 30 seconds. At this point
the current collector temperature is recorded as the
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 2nd relay works independently from the solar ope-
ration and may be used for storage of surplus energy or
after-heating.
• AH O < AH F
the 2nd relay is used for after-heating
• AH O > AH F
the 2nd relay is used for use of surplus energy
On the display is shown if the second relay output is
activated.
4.1.15 Thermostat function
(Arr = 2)
after-heating use of surplus energy
AH O:
2nd relay-switch-on
temperature
Adjustment range:
32 ... 203 °F
Factory setting: 104 °F
AH F:
2nd relay-switch-off tempe-
rature
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

USDT 3002
© 06279 usdt_3002.monus.indd
13 |
1 2
S1 S2 S3
3456
Temp. Sensor
Pt1000
LNR1NR2N
201918171615
S4
7 8 141312
2 (1) A 115
2
V~
(1) A 115 V~
R1
R2
T4A
115 V~
5. Tips for Troubleshooting
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 off
The power supply of the controller should
be checked if the control lamp goes out.
o.k.no
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).
Operating control lamp flashes red. 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 sensors pinched
off can be checked with an ohmmeter.
In the following the resistance values
corresponding to different temperatures
are listed.
°F Ω °F Ω
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

USDT 3002
© 06279 usdt_3002.monus.indd
| 14
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 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
Control / 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 unfavor-
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,
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.

USDT 3002
© 06279 usdt_3002.monus.indd
15 |
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 tank insulation suffi-
cient?
yes no
Intensify the insulation.
Is tank insulation close
enough to the tank?
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
an 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 defective -
replace it.
Are the fuses of the
controller 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
Cleaning or replacement.
valve in parallel; activate
the circulation again!
a
a b
b

USDT 3002
© 06279 usdt_3002.monus.indd
| 16
Distributed by:
Please note:
The design and specifications are subject to change without notice.
The illustrations may differ from original product.
Thermo Technologies
5560 Sterrett Place
Suite 115
Columbia, MD 21044
Tel.: [phone]
Fax: [phone]
www.thermomax.com
[email protected]
6. Accessories
Overvoltage protection
We highly recommend installing the overvoltage protection
in order to avoid damages at the collector (e.g. by lighte-
ning).
Sensors
Our product range includes high-precision temperature
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
For calculating energy gains and losses by measuring the
volume flow in your system.