Steca TR A301 Installation And Operating Instructions Manual
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Steca TR A301 Installation And Operating Instructions Manual

Temperature difference controller
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SOLARTHERMIE - SOLAR THERMAL SYSTEMS - SOLAR TÉRMICO - SOLAIRE THERMIQUE - SOLARE TERMICO
Installation and operating instructions
Temperature difference controller
3 inputs, 1 PWM control signal for an ECM pump
These operating instructions are part of the product.
Read the instructions carefully before use,
keep them over the entire lifetime of the product,
and pass them on to any future owner or user of this product.
EN
738.955 | Z01 | 10.40 |
Subject to change due to technical improvements!

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  • Page 1 SOLARTHERMIE - SOLAR THERMAL SYSTEMS - SOLAR TÉRMICO - SOLAIRE THERMIQUE - SOLARE TERMICO Installation and operating instructions Temperature difference controller 3 inputs, 1 PWM control signal for an ECM pump These operating instructions are part of the product.  Read the instructions carefully before use, ...

  • Page 2: Table Of Contents

    Inhalt 7 Description of the controller 1 About these instructions ..3 functions ......... 20 1.1 Applicability ......... 3 1. Users ..........3 7.1 Switch-on / switch-off 1.3 Description of symbols ....4 temperature difference ....0 2 Safety ........5 7. Maximum storage tank temperature ......0 .1 Proper usage .......

  • Page 3: About These Instructions

    About these instructions 1.1 Applicability These instructions describe the installation, com- missioning, function, operation, maintenance and dismantling of the temperature difference controller for controlling an ECM high-efficiency pump within a solar thermal system (ECM = Electronic Commutated Motor). When installing the remaining components, e.g.

  • Page 4: Description Of Symbols

    1.3 Description of symbols 1.3.1 Structure of the warning notices Pictogram with cor- SIGNAL WORD responding warning Type, source and consequences of the danger! symbol. Measures for avoiding danger.  1.3.2 Danger levels in warning notices Danger level Likelihood of Consequences occurrence resulting from non-compliance Imminent Death, serious DANGER threat of danger bodily injury Possible Death, serious WARNING threat of danger bodily injury Possible Minor...

  • Page 5: Safety

    1.3.4 Other symbols and markings Symbol Meaning Condition for action ✓ Call to action  Result of action  • List Emphasis on Emphasis on issue at hand issue at hand Safety 2.1 Proper usage The temperature difference controller – hereinafter referred to as controller – is an independently installed electronic temperature controller for on-surface installa- tion.

  • Page 6: Dangers During Assembly / Commissioning

    2.3 Dangers during assembly / commissioning The following dangers exist during installation / com- missioning of the controller and during operation (in case of installation errors): • Risk of death by electrocution • Risk of fire due to short-circuit • Damage to any of the constructional fire safety measures present in the building due to incorrectly installed cables •...

  • Page 7: Detecting Faults

    Before connecting the device, make sure that the  power supply matches the specifications on the type plate. Make sure that all devices which are connected to  the controller conform to the technical data of the controller. Secure the device against unintentional start-up. ...
  • Page 8 in any way related to incorrect installation, incorrect execution of installation work, improper operation and incorrect usage and maintenance. Similarly, we assume no responsibility for patent right or other right infringements of third parties caused by usage of this controller. The manufacturer reserves the right to make changes to the product, technical data or installation and oper- ating instructions without prior notice.

  • Page 9: Description

    Description 3.1 Controller in the solar circuit 3.1.1 The purpose of the controller The controller provides speed control of the ECM pump in a solar thermal system (see section 7 "Description of the controller functions"). 3.1.2 The structure of the solar circuit Temperature sensor 1 Temperature difference controller (collector sensor) Storage tank Collector Solar circuit ...

  • Page 10: Casing Overview

    3.1.3 The function of the solar circuit The controller constantly compares the temperatures between the collector (T1) and the lower area of the storage tank (T). Once the sun heats the collector and there is a temperature difference of 8 K between the collector and the storage tank, the pump is switched The pump extracts the heat transfer fluid from the lower cooler area of the storage tank and pumps it to the collector.

  • Page 11: Installation

    Installation 4.1 Opening / closing the casing DANGER Risk of death by electrocution! Disconnect the controller from the power supply  before opening the casing. Make sure that the power supply cannot be unin-  tentionally switched back on. Do not damage the casing.  Hinge grooves Only switch the power supply back on after the cas- ...
  • Page 12 4.2 Installation WARNING Risk of electrical shock and fire if mounted in a damp environment! Only assemble the controller in an area where the  degree of protection is sufficient. 4.2.1 Mounting the controller CAUTION Risk of injury and damage to the casing when drill- ing! Do not use the casing as a drilling template. ...

  • Page 13: Electrical Connection

    4.3 Electrical connection DANGER Risk of death by electrocution! Disconnect the controller from the power supply  before opening the casing. Observe all applicable legal guidelines and regula-  tions of the local electricity supplier. NOTE The device is to be connected to the grid by means of a plug with grounding contact, or in the case of a fixed electrical installation via a disconnection device for complete disconnection in accordance with the...
  • Page 14 Feeding cable through rear of casing (fig. 1): WARNING Risk of electrical shock and fire due to cables com- ing loose! Install an external strain relief for the cables.    Remove the plastic flaps from the rear side of   the casing using an appropriate tool. Feeding the cable through the lower side of Fig. 1: cable feed from the rear the casing (fig. 2): WARNING Risk of electrical shock and fire due to cables com-...
  • Page 15 Each terminal may only be connected to a single connecting wire (max .5 mm The spring terminals are approved for connection  of cables as follows: single wire (solid): ≤ 2.5 mm² fine strand (flexible): ≤ 2.5 mm² (the stranded wires must be twisted with 1 twist per 0 mm) fine strand (with core end sleeves): ≤...
  • Page 16 4.3.3 Terminal plan Optional: Grundfos Direct Sensors VFS 1-1 4.3.4 Actuating the connecting terminals NOTE The connecting terminal may only be actuated with an appropriate tool. An unsuitable tool or too much mechanical pressure can damage or even destroy the connecting terminal. 738.955 | 10.40...

  • Page 17: Display Overview

    Display overview °  ºC ºF  Speed control Temperature sensor symbols Top T1 = collector sensor Holiday function (see page 35) Bottom T1 = sensor for tube collector function Anti-freeze function (see page 34) T = sensor for lower area of storage tank Symbols for pump operation and heat transfer fluid circulation...

  • Page 18: Commissioning

    Commissioning   6.1 Testing the pump CAUTION Damage to pump caused by dry operation! Make sure that the solar circuit is filled with heat  transfer fluid. The controller casing is closed. ✓ All connections are properly made. ✓ The solar energy system is filled. ✓ Connect the mains supply. ...
  • Page 19 CAUTION The incorrect operating mode may cause the sys- tem to shut down or impair proper functioning! After testing the pump, always set the operating  switch to automatic operation.   To set the controller to automatic operation, move  the operating switch to the middle position (Auto). Aut is shown in the display for approx.

  • Page 20: Description Of The Controller Functions

    Description of the controller functions 7.1 Switch-on / switch-off temperature dif- ference The controller constantly compares the temperatures between the collector (T1) and the lower area of the storage tank (T). As soon as the temperature in the collector (T1) is 8 K (constant fixed value) higher than the temperature in the storage tank (T), the following display appears: ...

  • Page 21: Maximum Collector Temperature . 1

    lower area of the storage tank (T) reaches the set maximum storage tank temperature (factory setting of 60 °C), charging is stopped. A temperature of 3 K below the maximum storage tank temperature must first be reached before charging can be resumed. ...

  • Page 22: Anti-Freeze Function

    at regular intervals to transmit the actual heat from the collector pipe to the sensor (T1). If the tube collec- tor function is activated, the controller automatically switches the pump on every 30 minutes for 30 sec-   onds. The following displayappears: •...
  • Page 23 energy systems also contain an additional corrosion inhibitor.   The anti-freeze symbol appears and the display shows the following message. 7.6 Holiday function The holiday function is used to cool down a completely heated storage tank again via the collector. The stor- age tank can heat up too much, e.g.

  • Page 24: Flow Test Service Function

    7.7 Flow test service function The flow test service function is used to check the flow rate at maximum pump speed. The pump remains switched on at 100 % performance while the flow test service function is activated. NOTE A Grundfos Direct Sensors VFS 1-1 must be con- nected in order to use the flow test service function.
  • Page 25 Speed control "oFF": Control signal as switched out- When switched on, the solar circuit pump runs at maximum speed (100 %) and delivers a constant vol- ume flow. Speed control "on": Control signal speed controlled When switched on, the solar circuit pump runs at a controlled speed in the range of 30 ... 100 % and deliv- ers a regulated volume flow.

  • Page 26: Operation

    be charged with the absolute temperature. The desired absolute temperature can be entered in the setup. Operation CAUTION The incorrect operating mode may cause the sys- tem to shut down or impair proper functioning! Make sure that the operating switch is set to auto-  matic operation. 8.1 Setting the controller (main menu) The main menu of the display shows the temperature...
  • Page 27 8.1.1 Main menu overview Saved min/max values are deleted and set to Min/max temperature the current tempera- values are shown alter- ture value nately on the display Temperature sensor T1 Press 2 sec briefly with current tempera- Reset ture End of  ...
  • Page 28 8.1.2 Displaying temperature values and flow rate Use the buttons to select the tempera-    ture sensor or flow rate sensor (T1, T, T Grundfos Direct SensorsTM VFS 1-1 , Q Grundfos Direct Sensors VFS 1-1).   The selected sensor and the current measured value ...
  • Page 29 8.1.4 Deleting min. / max. temperature values Desired temperature sensor is selected. ✓ Press the button briefly.    Min. / max. temperature values are shown alter-  nately on the display. Press the button for approx.  seconds until the  temperature values saved are deleted. ...
  • Page 30 rate as the max. flow rate. To exit the max. flow rate, press the but-    ton. 8.1.7 Displaying the operating hours of the pump Use the button to select the operating    hours of the pump.   The operating hours of the pump appear on the ...

  • Page 31: Setting The Controller (Settings Menu)

    8.2 Setting the controller (settings menu) °C 8.2.1 Overview of settings menus °F °C * Note: Main menu Temperature unit °C °C All temperature values °C  2 sec °F are sample values only °F °F °F Section 8..3 2 sec   Tube collector function  2 sec °C Section 8..4...
  • Page 32 8.2.2 Using the settings menus To open the settings menus, press the button  for approx.  seconds. Settings menu "Temperature unit" is displayed.  To switch to the next settings menu, press the  button.  To exit the settings menus, press the button ...
  • Page 33 The settings menu is open. ✓   The Symbols for temperature sensor T1 and tube ✓ collector function flash. Press the button for approx.  seconds until top  temperature sensor T1 is changed to bottom T1. To exit the settings menu, press the button ...
  • Page 34 8.2.6 Activating the anti-freeze function CAUTION System can freeze despite the activated anti-freeze function! During a power outage, the anti-freeze function does not operate. During long-term periods of frost (due to restricted water tank heat storage). If collectors are mounted in locations exposed to wind. If frost is expected for a long period of time, only ...
  • Page 35 8.2.7 Activating the holiday function The settings menu is open. ✓   The holiday function symbol flashes. ✓ Press the button for approx.  seconds to  toggle between "oFF" and "on". To exit the settings menu, press the button   again until the main menu appears.
  • Page 36 The speed control function makes a distinction between the "absolute temperature control (AbS)" and "differen- tial temperature control (diF)". Press the button for approx.  seconds to tog-  gle between "AbS" and "diF". Depending on the "AbS" or "diF" setting, the following setting options are available: ...
  • Page 37 8.2.9 Activating the flow test service function The operation switch must be set to AUTO (middle position) in order to activate the flow test service function. Press the buttons simultaneously for     seconds. "on" and the current flow rate in [l/min] are ...

  • Page 38: Maintenance

    Maintenance The controller was conceived for years of continuous trouble-free operation. Nevertheless, faults may occur. Maintenance may only be performed by professional personnel. The fault is usually not in the controller but rather in the peripheral system components. The following descrip- tion covers the most common problems encountered with the controller.
  • Page 39 The pump, which is connected to the controller, is not running, although its switch-on conditions have been fulfilled. Secondary Possible cause / remedy symptoms • The pump symbol Pump connection cables not rotates in the connected or interrupted. display Have professional person-  nel check the cables. •...
  • Page 40 Short-circuit symbol and warning sign appear. Secondary symptoms Possible cause / remedy • The pump symbol Short-circuit in the tem- does not rotate perature sensor or its sup- ply cable • Display background Short-circuit and warning sign Short-circuit and warning sign Have professional per-  alternately flashes (example) (example) sonnel check the tem- red and yellow perature sensor supply...
  • Page 41 NOTE The pump does not stop running in the case of an interruption in the Grundfos Direct Sensors VFS 1-1 T or Q. "SYS" and the warning sign flash in the controller display. Possible cause / remedy SYS means there is a system error. This means that despite the pump running, a temperature differ- SYS-display SYS-display...

  • Page 42: Testing The Temperature Sensor

    9.2 Testing the temperature sensor 9.2.1 Safety Only professional personnel may test the temperature sensor. 9.2.2 Testing the resistance values DANGER Risk of death by electrocution! Disconnect the controller from the power supply  before opening the casing. The temperature is recorded by type Pt1000 resistance sensors. The resistance value of the sensor changes depending on the temperature.

  • Page 43: 10 Dismantling And Disposal

    Temperature sensor resistance values Temperature [°C] Resistance [Ω] 1000 1039 1078 Temperature [°C] Resistance [Ω] 1117 1155 1194 13 171 1309 Temperature [°C] Resistance [Ω] 1347 1385 143 1461 1498 1536 Temperature [°C] Resistance [Ω] 1573 1611 1648 1685 10 Dismantling and disposal DANGER Risk of death by electrocution! Disconnect the controller from the power supply ...

  • Page 44: 11 Legal Guarantee

    11 Legal guarantee In accordance with German statutory regulations, there is a -year legal guarantee on this product for the customer. The seller will remove all manufacturing and material faults that occur in the product during the guaran- tee period and affect the correct functioning of the product.
  • Page 45 in value caused by the fault shall be replaced, or, if this is not sufficiently taking the interests of the end cus- tomer into consideration, the contract is cancelled. Any further claims against the seller based on this guarantee obligation, in particular claims for damages due to lost profit, loss-of-use or indirect damages are excluded, unless liability is obligatory by law.

  • Page 46: 12 Technical Data

    12 Technical data Temperature difference controller Operational voltage 30 V~ (+/– 15 %), 50 Hz Controller's own consumption ≤ 1 W Inputs  x temperature recording (Pt1000) 1 x Grundfos Direct Sensors VFS 1-1 input (flow rate and temperature) Output R1: Triac switched output for permanently supplying power to the ECM pump C: PWM control signal for pump speed: 8 mA, 5 V, 50 Hz...
  • Page 47 Casing recyclable 3-piece plastic casing Dimensions L x W x H [mm] 137 x 134 x 38 Temperature sensors Pt1000, silicone cable, 1.5 m (measuring range up to +180 °C) Fuse 1.6 AT, 3.9 A²s 738.955 | 10.40...
  • Page 48 738955...

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