Thermo Technologies USDT 3002 User Manual

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USDT 3002

Unit Mounting Power Connections Operation Troubleshooting

Thanks for buying. Read this manual carefully to get the best perfomance from this unit.

USDT 3002

manual

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USDT 3002

Contents

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

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

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.

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USDT 3002

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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.

• System status diagnostics

• Symbolic display of all parameters

• 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 measurements

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

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

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USDT 3002

1 2

S1 S2 S3

3 4 5 6

Temp.Sensor

Pt1000

LNR1NR2N

201918171615

7 8

141312

2 (1) A 115 2

(1) A 115V~

T4A

115

1. Installation

1.1 Mounting

cover

cable conduits with strain relief

ﬁxation

hanging

display

pushbutton

can fuse 4A

Warning! Switch-off power supply before opening the housing.

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.

1.2 Electrical wiring

Sensor clamps

earthing clamps

fuse

consumer clamps

net clamps

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 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 terminals are:

19 = neutral conductor N 20 = conductor L 12 = ground clamp

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Electrostatic discharge can damage electronic components

Dangerous voltage on contact

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USDT 3002

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

Arr 1

S4 / TRF

1.2.2 Allocation of terminals for system 2 (Arr 2)

Arr 2

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

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.

S4 / TRF

Symbol Speciﬁcation

S1 collector sensor S2 tank sensor below S3 tank sensor at the top

S4 / TRF optional sensor for ﬂow

- meter/additional temperature input

R1 solar pump R2 pump for heat exchange

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USDT 3002

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2. Operation

2.1 Pushbuttons for adjustment

backwards

forward

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

(selection / adjustment mode)

SET

2.2 System monitoring display

Complete Monitoring-Display

2.2.1 Channel indication

only channel indication

2.2.2 Tool bar

only tool bar

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 .

The additional symbols of the tool bar indicate the current system status.

Symbol standard ﬂashing

relay 1 active

relay 2 active

maximum tank temperature active / maximum tank temperature exceeded

antifreeze- function activated

collector cooling function or reccoling function active

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

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USDT 3002

2.2.3 System screen

only system screen

Collector 1

Pumps

Sensor

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 tank top

Tank heat exchanger

Collectors with collector sensor

Tank 1 and 2 with heat exchanger

3-way-valves

The ﬂow direction or the current breaking capacity are always shown.

2.3 Blinking codes

2.3.1 System screen blinking codes

Tank

Additional symbol for operation of the burner

Tank 2 or or 2nd relay option (with additional symbol)

Temperature sensor

Heating circuit

Pump

After-heating

with burner symbol

• 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

2.3.2 LED blinking codes

Constantly green: System functioning correctly Red/green blinking: blinking initialisation phase of manual

operation

Red blinking: sensor defect

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USDT 3002

3. Activating the Operating System User has the option of a one or two relay system

1. AC power supply must be activated. The controller passes an initialisation phase in which the operating control lamp

Operation control lamp

backwards

(Selection / Adjustment mode)

SET

Arr 1

forward

Arr 2

ﬂashes red and green. At this point the controller is in automatic 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:

Corresponding channel is available.

Corresponding channel is available if the appropriate option is activated.



Corresponding channel is only available if the option heat quantity measurement is activated (OWMZ).

Please note: S3 and S4 are only indicated if sensors are connected.

channel

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 S4 h P1 x Operating hours relay 1 9 h P2 x Operating hours relay 2 9 kWh MWh 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

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Arr speciﬁcation page

1 2*

   

   

Temperature return sensor 9 Temperature sensor 4 9

Heat quantity kWh 10 Heat quantity MWh 10



Corresponding channel is only available if the option heat quantity measurement is deactivated (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.

channel

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 MEDT 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

Arr speciﬁcation page

1 2*

   

Maximum ﬂow 12 Antifreeze type 10

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USDT 3002

4.1.1 Indication of collector temperatures

COL:

Collector temperature display range: -40 ... +482 °F

4.1.2 Indication of tank temperatures

TST:

Tank temperatures Display range: -40 ... +482 °F

4.1.3 Indication of sensor 3 and sensor 4

S3, S4:

Sensor temperatures Display range: -40 ... +482 °F

4.1.4 Indication of other temperatures

TRF:

other measured temperatures Display range: -40 ... +482 °F

Displays the current collector temperature.

• COL : collector temperature (1-collector-system)

Displays the current tank temperature.

• TST : tank temperature (1 relay)

• TSTL/U: tank temperature (2 relays)

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).

Displays the current temperature of the connected sensor.

4.1.5 Operating hours counter h P1, h P2:

Operating hours counter Display channel

4.1.6 Measuring Collected Energy

OHQM:Energy Collection

Measuring Adjustment range: OFF ... ON Factory setting: OFF FMAX: Volume ﬂow in l/min Adjustment range 0 ... 20 in steps of 0,1 Factory setting 6,0

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 returns automatically into the indicaton mode.

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%.

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USDT 3002

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

kWh/MWh: Collected Energy in kWh / MWh Display channel

Type of antifreeze:

0 : water 1 : propylene glycol 2 : ethylene glycol 3 : Tyfocor® LS / G-LS

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 procedure is interrupted. The controller returns automatically into indication mode.

4.1.7 ∆ Delta T Adjustment

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

Please note: Switch-on temperature difference DO must be at least 2 °Ra higher than the switch-off temperaturedifference DF.

4.1.8 Maximum tank temperature

S MX:

Maximum tank temp. Adjustment range 40 ... 205 °F Factory setting 140 °F

4.1.9 Emergency Shutdown of Collector Collector emergency shutdown

EM:

Limit collector temperature Adjustment range 230 ... 400 °F, Factory setting 285 °F

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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 switchesoff.

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 securityswitch-off of the tank, which avoids a further loading of the tank if 203 °F are reached at the tank.

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).

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USDT 3002

4.1.10 System cooling

OCX:

Option system cooling Adjustment OFF ... ON Factory setting OFF

CMX: Maximum collector temp. Adjustment range 210 ... 380 °F Factory setting 250 °F

4.1.11 Minimum collector temperature option

OCN:

Adjustment range OFF / ON Factory setting OFF

CMN: Minimum collector temperature Adjustment range 14 ... 32 °F Factory setting 50 °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.

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).

4.1.12 Antifreeze function option

OCF:

Antifreeze function Adjustment range OFF / ON Factory setting OFF

CFR: Antifreeze temperature Adjustment range 14 ... 50 °F Factory setting 40 °F

4.1.13 Recooling function OREC:

Recooling adjustment range OFF ... ON Factory setting: OFF

The antifreeze function activates the loading circuit between 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 exceeded 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 overhe ating of the collect or. 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.

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USDT 3002

4.1.14 Tube collector special function

O TC:

Tube collector special function Adjustment range: OFF ... ON Factory setting: OFF

4.1.15 Thermostat function

(Arr = 2)

after-heating use of surplus energy

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.

The 2nd relay works independently from the solar operation and may be used for storage of surplus energy or after-heating.

AH O:

2nd relay-switch-on temperature Adjustment range: 32 ... 203 °F Factory setting: 104 °F

4.1.16 Operating mode

HAND1,HAND2:

Operating mode Adjustment range: OFF, AUTO, ON Factory setting: AUTO

4.1.17 Language

• 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.

AH F:

2nd relay-switch-off temperature 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 adjustment value HAND, in which the following adjustments can be made:

• HAND

Operating mode OFF : relay off (ﬂashing) + AUTO : relay in automatic operation ON : relay on (ﬂashing) +

LANG:

Adjustment of language Adjustment range: dE, En, It Factory setting: En

4.1.18 Unit UNIT:

Adjustment of unit Adjustment range: FAH, °C Factory setting: FAH

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The menu language can be adjusted in this channel.

• dE : German

• En : English

• It : Italiano

• Fr : French

The menu unit can be adjusted:

• °FAH

• °CEL

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USDT 3002

1 2

S1 S2 S3

3 4 5 6

Temp.Sensor

Pt1000

LNR1NR2N

201918171615

7 8

141312

2 (1) A 115 2

(1) A 115V~

T4A

115

5. Tips for Troubleshooting

can fuse T4A

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

If a malfunction occurs, a notiﬁcation is given on the display of the controller:

Warning symbol

Operating control lamp

Operating control lamp off

The power supply of the controller should be checked if the control lamp goes out.

o.k.no

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

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).

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USDT 3002

5.1Various:

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.

Air in the system?

Exhaust the system; increase system pressure

no yes

to at least static primary pressure plus 0,5 bar ; if ne cessary con tinue to increase, switch the pump for a short time off and

Is the collector circuit

on.

plugged at the dirt trap?

yes

Clean the dirt trap

Pump starts up very late and soon stops working soon.

Pump starts for a short moment, switches-off, switches-on again, etc. („controller hunting“)

Is the temperature difference at the controller too small?

no yes

Change ∆Ton and ∆Toff accordingly.

Wrong placing of the

o.k.no

collector sensor?

yes

Mount the collector sensor at solar feed flo w (warmest collector out-

Plausibility control of the option tube collector special function?

put); use the immersion sleeve of the respective collector.

The temperature difference between tank and collector increases enormously during operation; the collector circuit cannot dissipate the heat.

Switch-on-temperature difference ∆Ton too large?

no yes

Collector sensor unfavorable placed (e.g. contact sensor instead of immersion sleeve sensor?

yes

Change ∆Ton and ∆Toff accordingly.

If necessary activate tube collector function.

o.k.

Collector circuit pump defect ?

no yes

Heat exchanger calciﬁed?

yes

Heat exchanger plugged?

yesno

Heat exchanger too small?

yes

Control / replace

Decaliﬁcation

Cleaning

New calculation of the dimension.

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USDT 3002

Tanks are cooled during the night.

a b

Control the return ﬂow preventer in warm water circulation- o.k.

Please also check further pumps which are connected to the solar tank.

Does collector circuit pump run during the night?

no yes

Collector temperature is at night higher than ambient temperature.

no yes

Is tank insulation sufﬁcient?

yes no

Is tank insulation close enough to the tank?

yes no

Are the tank connections insulated?

yes no

Warm water outﬂow upwards?

no yes

Does warm water circulation run for a very long time?

no yes

Switch-off the circulation pump and the blocking valve for 1 night; less tank losses?

yes no

Check the controller functions

Check the return flow preventer in feed ﬂow and return ﬂow with regard to the functional efﬁciency.

Intensify the insulation.

Replace or intensify the insulation.

Insulate connections.

Change connection and let the water flow sidewards or through a siphon (bow downwards); less tank losses now?

no yes

o.k.

Use the circulation pump with timer and switch-off thermostat (energy efficient circulation)

Check the pumps of the after-heating circuit according to nightly run and defect return ﬂow preventer; problem solved?

yes no

The gravitation circulation

Cleaning or replacement. in the circulation line is too strong; insert a stronger return ﬂow preventer or an electrical 2-way valve behind the circulation pump; the 2-way valve is open in pump operation, otherwise it is closed,

valve in parallel; activate

the circulation again! conect pump and 2-way

The solar circuit pump does not work although the collector is obviously warmer than the tank.

Does the control LED ﬂash?

There is no current; check

fuses / replace them and

yes no

Does the pump start up in manual operation?

yes

check power supply.

The adjusted temperature

difference for starting the

pump is too high; choose

an matching setting

Is the current of the pump released by the controller?

yes

Is the pump stuck?

yes

Put the pump into operation by means of a screwdriver; is it passable now ?

Are the fuses of the controller o.k.?

no yes

Replace the fuses.

Is the pump defective -

replace it.

Controller seems to be

defective - replace it.

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USDT 3002

6. Accessories

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.

Overvoltage protection

We highly recommend installing the overvoltage protection in order to avoid damages at the collector (e.g. by lightening).

Flowmeter

For calculating energy gains and losses by measuring the volume ﬂow in your system.

Thermo Technologies

5560 Sterrett Place Suite 115 Columbia, MD 21044

Tel.: (410) 997-0779 Fax: (410) 997-0778

www.thermomax.com info@thermomax.com

Distributed by:

Please note:

The design and speciﬁcations are subject to change without notice. The illustrations may differ from original product.

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