RESOL EL2 · 2015. 9. 25. · RESOL EL2 115 442 60 RESOL EL2 - full kit - incl. 4 temperature sensors Pt1000 (1 x FKP6, 3 x FRP6) 115 442 70 • universal temperature differential

RESOL - Elektronische Regelungen GmbH • Heiskampstr. 10 • D-45527 Hattingen • Tel.:+49 (0) 23 24/96 48-0 Fax: +49 (0) 23 24/96 48-55 • eMail: [email protected] • Internet: http://www.resol.de

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RESOL EL2Temperature Differential Regulator for systems with 2 stores Manual

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Technical dataRESOL EL2

Housing:plug-in, plasticProtection type:IP40 / DIN 40050Size:160 x 72 x 119 mmAmbient temperature:0 ... 40 °CInputs: 4 sensor inputs Pt1000Outputs: 5 relay outputs: 4 stan-dard (4 A) and 1 semi-conductor relay (1 A) for pump speed controlTemperature diff. ∆T(SET):2 ...11 K, separately adju-stableTemperature limitation: 20 ... 90° C(to be continued next page)

No responsibility can be accepted for any errors or technical changes.

The RESOL EL2 is a microprocessor controlled temperature differential regulator for solar systems with 2 stores. Priority can be given to one store. The intelligent priority switch steadily controls the irradiation conditions by means of the measured values in relation to the chosen turn-on conditions. An internal control provides for an optimum ener-getical loading of the priority store.Temperature difference, maximum store temperature and operation mode are user-friendly adjustable for each store separately. The different temperatures as well as solar operating hours can be read out on the LED-display by pressing the pushbuttons.A control lamp indicates sensor defects.Pumps as well as 3-way valves or 2-way-valves can be used as actuators for store loading.As soon as all stores have reached their maximum temperatures, one re lay output (Tmax, R5) is switched on by the regulator in order to in-telligently use the surplus energy. The regulator is additionally equipped with a thermostat function, which can be used e. g. for the after-heating process.

Order indication Article-no.

RESOL EL2 115 442 60RESOL EL2 - full kit -incl. 4 temperature sensors Pt1000 (1 x FKP6, 3 x FRP6) 115 442 70

• universal temperature differential regulator for application in solar and heating systems with 2 stores

• intelligent priority switch

• digital display

• all values are separately adjustable for each store

• pump speed control

• Bus-connection for remo-te data display, data logger and PC

• operating hour counter

• Thermostat function


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(continued from page 1) Technical data RESOL EL2

Total power consumption:max. 4APower supply:230 Volt, 50 - 60 Hz ± 10 %Bus-connection: RESOL V-Bus, for connec-tion of up to 3 modules

Examples

Accessory

Overvoltage protection

it is highly recommended to connect this RESOL overvoltage protetion SP1 to all collector sensors which are externally mounted and especially for solar systems in order to avoid overvoltages (e.g. lightning).

Order indicationRESOL SP1 Article-no.:180 110 10

RESOL DFA2

Additional module for comfortable temperature, function and malfunc-tion control. The RESOL DFA2 is directly connected to the regulator by a 2-wire line without separate power supply.

Order indicationRESOL DFA2 Article-no.:180 002 60

RESOL WMZ-M1 Universal calorimeter module for solar and heating systems (full kits including temperature sensors and flowmeter)Order indicationRESOL WMZ-M1 Article-no.:135 303 00


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Safety regulations:Please read the following information carefully before installing and operating the regulator. In this way damage to the regulator or the solar system will be avoided. All electrical wiring must comply with the latest IEE regualtions.

The housing can be opended by removing the two screws (1) and pulling the cover (2) carefully from the base (3). The wiring backplate can be fixed in a switch box or directly to the wall using the fixing holes provided (4). The electrical connection can be effected now. The unit must only be located internally. It is not suitable for installation in hazardous locations and should not be sited near to any electroma-gnetic fields.

Warning: Switch off power supply be-fore opening the housing !

The power supply to the regulator must only be made by an external power supply switch (last step of mounting!) and the line voltage must be 230 Volt ± 10 % (50...60 Hz).The power supply is effected at the terminals: 24 = neutral conductor N 25 = conductor L ground clamp = protective earth conductor Pumps, valves etc. are connected to the consu-mer-outputs R1 up to R5:15 = relay output Tmax (R5)16 = relay output thermostat (R4) 17 = relay output store loading store 2 (R3)18 = relay output store loading store 1 (R2)19 = relay output solar operation (solar pump) (R1)20-23 = neutral conductor for consumer (N)The temperature sensors T1 up to T4 are con-nected to the following terminals independently of the polarity: 1 / 2 = collector sensor (T1) 3 / 4 = temperature sensor store 1 (T2) 5 / 6 = temperature sensor store 2 (T3) 7 / 8 = additional sensor for thermostat func-

tion (T4)

1. Mounting

1.1 Electrical connection


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The regulator RESOL EL2 is equipped with a RE-SOL V-BUS-connection for data transmission and energy supply (terminals 11 and 12, marking of connection „BUS“ at the base / isolation plate). One or more RESOL V-Bus modules can be con-nected by this data bus:

• RESOL WMZ-M1, calorimeter-module.

• RESOL DFA2, temperature and malfunction dis-play for comfortable control of the most impor-tant measuring data at remote places.

• RESOL PC-adapter for transmission of the measuring data to a connected PC. Evaluation and visualisation occurs by the software EL2/3.

Further modules are in preparation.

Precision-platin-temperature sensors Pt1000 (FKP and FRP) are used for the RESOL EL2.

The arrangement of the sensors is of great importance to the total efficiency of the regulator. The collector temperature should be measured in the upper part of the collector. In stores with own heat exchanger, the sensor must be directly mounted in the upper part of the heat exchanger. By using external heat exchangers, the sensor must be fixed at the bottom of the store. For individual operation systems, our product range contains 3 different types of sensors (sensors for installation in present immersion sleeves, flatscrew sensors or cylindrical clip-on sensors). The sensor types FK and FR have the same electrical features and are available in the same models, They only differ in the connecting cable:

2. Sensor types

FK: 1,5 m weather- and temperature resistant silico-ne cable for temperatures between -50 °C ... +180 °C, mostly used for collectors.

FR: 2,5 m PVC cable for temperatures between -5 °C ... +80 °C, mostly used for stores.

Make sure that all electrical works are carried out ac-cording to the relevant local and IEE-regulations. The sensor cables carry low voltages and they must not run together in a cable conduit with cables carrying higher voltages than 50 Volt. By using longer cables or cable conduits, please use screened cables. The sensor cables can be lengthened up to 100 m, but the cross section must be 1,5 mm² (or 0,75 mm² up to a cable length of 50m); screened cables should be preferably used. The sensors must not get directly in contact with water, please use always immersion sleeves.

1.2 Data bus

Standard temperature sensors: for installation in pre-sent immersion sleeves (they are included in complete packages)FKP6 or FRP6: 6 mm, Pt1000Immersion sensors: available in different length (= immersion depth)FKP60: 60mm immersion depth, chromium-plated copperFKP150: 150mm immersion depth, chromium-plated copper Important: The sensor must be completely pushed into the sleeve and the nut must be slightly tightened.


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Cylindrical clip-on sensors: for any pipe diameter, cpl. with fastening collarFKP20 or FRP20 Ensure good thermal contact of the sensor with the pipework by cleaning the contact area and by applying heat conduction paste between sensor and pipe. In order to protect the sensor cable against outside temperature influences, it is recommended to insulate the pipe.

Flatscrew sensors: for installation on flat surfacesFKP8 or FRP8 Ensure good thermal contact. Use conduction paste and insulate the sensors against outside temperature influences.Indication:In order to avoid overvoltage damage at the coll-ector (e.g. by lightning), it is highly recommended to use the overvoltage protection RESOL SP1.

3. Function and Equipment

3.1 Temperature difference ∆T The regulator controls the temperatures T1, T2 and T3 measured by 3 sensors and compares the resulting temperature differences ∆T(actual)with the preadjusted temperature differences ∆T(SET). If the difference is hig-her than ½∆T(SET), the corresponding relay outputs are connected. ∆T1 is related to the temperature difference between collector and store 1, ∆T2 is related to store 2.

The temperature limitation prevents a store loading beyond a preadjusted value. Next to the potentiometer Tmax is a yellow control lamp, which lights up if the maximum temperature is reached. T1max is related to store 1, T2max is related to store 2.

3.2 Maximum store temperature Tmax

The relay output R1 is designed for the pump speed control of a pump. The regulator controls the tempera-tures T1, T2 and T3 measured by 3 sensors and com-pares the resulting temperature differences ∆T(ACTUAL) with the preadjusted temperature differences ∆T(SET). If the difference is higher than ½∆T(SET), the pump P1 (R1) is connected and started up with the minimum pump speed. Dependent on an increasing temperature difference ∆T(actual) the pump speed is also increased in order to garanty a constant heat transfer. A minimum pump speed (ex works 30% preadjusted) for the pump can be adjusted in the control and adjustement level (see chapter 3.13).

3.3 Pump speed control


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3.4 Mode switch The regulator EL2 is equipped with 2 mode switches for the relays related to the store. The following operating modes can be adjusted:

0 relay for the selected store is cut-offAuto automatic operation for the relay output for the

selected storeI relay for the selected store is switched-on, con-

tinuous operation / continuous store loadingThe continuous operation for relay 1 (solar pump) is activated, if one of the two mode switches is set to position I. Both mode switches must be set to position 0 in order to garanty that the relay output R1 is cut-off.

3.6 Thermostat functionThe regulator is equipped with an additional thermostat function. Relay output R4 is switched on, if the adjusted value at temperature sensor T4 is underrun. The ope-rating status for this function can be adjusted by means of the wiper switch (thermostat) on the front side of the regulator:

0 thermostat function deactivatedAuto automatic operation for relay output R4 for the

thermostat functionI relay output R4 is activated, continuous operationThe required switching temperature can be adjusted by the above potentiometer (20 ... 90°C). The second poten-tiometer (2 ... 11K) is used for adjustment of the hystere-sis. The thermostat function works independently of the solar operation.

Thermostat

Warning: a flashing of the ∆T-LED indicates that the mode switch is in position 0 or I .

3.5 Priority switchThe regulator EL2 allows the adjustment of a store loading priority, which is controlled by the integrated priority logic. Priority can be given to one store, that means that this store is loaded up until the adjusted maximum store tempera-ture is reached. But if the adjusted temperature difference for this store is underrun, the less important store is loaded up for the adjusted minimum runtime (ex works: 15 min., adjustment range 2...30 min) (see chapter 3.13). The adjusted temperature differences are again controlled after this minimum runtime (waiting period, ex works 2 min, adjustment range 2 ... 30 min).

: parallel loading of the tores (no priority given)

: priority is given to store 1

: priority is given to store 2


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Switch on logic for improvement of the turn-on cha-racteristics of systems with unfavourably placed coll-ector sensors (sensors with sensor pockets cannot be used for tube collectors). A regularly synchronisation of the solar circuit improves the delated temperature measurement and prevents a delayed switching on of the system. This special function is deactivated ex works and can be activated in the control and adjustment level (see chapter 3.13).

3.7 Special function for tube collectors

If the temperature T1 (collector) rises in standstill of the pump (R1) above the adjusted maximum temperature of the heat source (ex works: 120°C, adjustment range 100 ... 150°C), the pump (R1) switches on. If the temperature T1 falls by 5 K under the adjusted value, the pump (R1) again switches off (if the maximum temperature of the store is reached). This function is activated ex works and can be deactivated in the control and adjustment level (see chapter 3.13).

3.8 Collector cooling function

The store can be loaded up by the collector coo-ling function over the adjusted maximum tem-perature, but with activated security switch-off only up to 90°C. This function makes only sense with Tmax < 90°C. This function is activated ex works and can be deactivated in the control and adjustment level (see chapter 3.13).

3.9 Security switch off

Achtung: a flashing of theTmax-LEDs informs that at this moment the security switch-off is only activated for the respective store

The temperature limitation Tmin analogously to the maximum store temperature prevents e.g. the further store loading, if the adjusted minimum temperature of the heat source is underrun. The minimum temperature can be adjusted within the control and adjustment level (see chapter 3.13) (ex works 0°C, adjustment range 0 ... 90°C).

3.10 Minimum temperature of the heat source

If the adjusted maximum store temperature is reached, the solar pump remains activated for recooling function in order to prevent an over-heating of the collector. Relay output R5 (Tmax) is simultaneously connected (see chapter 3.11). The consequence can be that the store tempe-rature increases, but only up to 90 °C (security switch-off). This special function is deactivated ex works and can be activated in the control and adjustment level.

3.12 Recooling function

If both stores have reached their maximum tem-peratures, the relay output R5 (Tmax) is switched on. In case that an appropriated actuator (pump, valve) is conneted, the surplus energy can be usefully used.

3.11 Use of surplus energy


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3.13 Display, control and adjustment level The LED-display of the controller always indicates the status value of the channel which has been selected by both pushbuttons. The channels can be selected by shortly pressing the upper or lower pushbutton. By pressing both pushbuttons, the 2 different levels can be entered:1. level (indication level)

T1 temperature T1, collector T2 temperature T2, store 1 T3 temperature T3, store 2 T4 temperature T4, additional sensor or tem perature sensor for thermostat function (optionally)Solar (h) total of the solar operating hours Error Fault report2. level (control and adjustment level)

The 2nd level can be selected by simultaneously pressing of both pushbuttons. The different chan-nels can be selected by shortly pressing the upper or lower pushbutton. The adjustment values can be modified by selecting that channel the value of which should be changed (channel 3 until c.H.). Afterwards both pushbuttons must simultaeously be pressed until LED T1 is illuminated. The value can now be changed by pressing one of both pushbuttons. After this modification both push-buttons must again be pressed until LED T1 goes out. The modified value is stored now.

K = control value

Indication:

If there is no input for about 15 seconds in the 2nd level, the re-gulator automatically goes back to the indication level.


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3.14 Data-BusThe bus-connection for data transfer is located at terminals 11 and 12 in the socket of the regula-tor. Additional modules, e. g. calorimeter RESOL WMZ-M1or remote data display RESOL DFA2 can be connected to a PC by a data line or by the in-terface adapter RESOL RS-COM. A twisted 2-wire line should be used as data line. The modules are connected according to the sketch (please see the manuals for allocation of the terminals).

A data transfer to a PC is possible by the interface adapter RESOL RS-COM. The measured values of the RESOL EL2 can be read out, processed and vi-sualized by the free evaluation tools. The software enables a comfortable assessment and function control of the system as well as a processing of the data records for a processing in other appli-cation programmes. The evaluation tool can be loaded down free of charge from the RESOL ho-mepage in the Internet (www.resol.de) or directly ordered at RESOL Elektronische Regelungen GmbH (full kit including interface adapter).

twisted 2-wire line Cinch-plug

interface adapter RS-COM

PC, COM-Port

Sub-D data line

This sketch shows all possible module connections. But the additional modules can also be connected separateley to the regulator.


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4. Adjustment and operation

1. Please set all mode switches at the front plate to position 0.

2. Adjustment of the set temperature differences ∆T1 and ∆T2 (K) by the potentiometer at the front plate.

3. Adjustment of the maximum store temperatu-res T1max and T2max (°C) by the potentiome-ter at the front plate.

4. Adjustment of the thermostat switching tem-perature (°C) and the corresponding hysteresis (K) by the potentiometer at the front plate.

5. Please adjust the required store loading priority by the wiper switch at the front plate.

6. Adjustment or activation/deactivation of addi-tional functions in the control and adjustment level by the pushbuttons and channels.

7. Please set all mode switches at the front plate to position Auto.

EL2 with thermostat function

5. Test aid

Resistances of Pt1000-Fühler

Please check the following items if the regulator RESOL EL2 does not work faultlessly:

1.Power supply

The power supply is guaranteed if at least one control lamp lights up. If not, please check the fuses.2. Error reports Errors are indicated by flashing of „Error“ on the display. A more detailed error description is indi-cated by chosing the channel „Error“.Display: E-F1 Error of sensor T1 E-F2 Error of sensor T2 E-F3 Error of sensor T3 E-F4 Error of sensor T4 E-EP Error in memory chip (please contact the manufacturer)In case of a sensor fault, please directly address to the defect sensor by the pushbutton. An inter-ruption of the sensor cable is indicated as follows: 888, a short-circuit: -888. If the sensors are not connected, they can be checked by a resistance measuring instrument.

Thermostat

The fuse can be checked after removing the back plate of the housing.


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6. Examples

6.1 Solar system with 1 collector and 2 stores (controlled by a pump)

The regulator determines the tem-peratures T1, T2 and T3 measured by the 3 sensors and compares the resulting tem perature difference ∆T(actual) with the preadjusted tem-perature differences ∆T(set). If the difference is higher than ½∆T(set), the corresponding pump is operated and the corresponding store is at the most loaded up until the adjusted maximum temperature. Priority can be given to one of both stores. If no priority is given to one of the stores, both stores are loaded up until their maximum tem peratures are reached (parallel loading).The sensor (T4) can additionally be used for measuring purpose or for after-heating function (see 6.4).

The regulator determines the tem-peratures T1, T2 and T3 measured by the 3 sensors and compares the resulting tem perature difference ∆T(actual) with the preadjusted tempe-rature differences ∆T(set). If the diffe-rence is higher than ½∆T(set), the pump is switched-on (with pump speed control) and the valve is accordingly opened. The store is at the most loa-ded up until the adjusted maximum temperature. The sensor (T4) can additionally be used for measuring purpose or for after-heating function (see 6.4).Attention:No parallel loading is possible in this hydraulic system, that means that the priority switch must be set to I or II.

6.2 Solar system with 1 collector and 2 stores (pump and 3-way-valve)

The shown examples should only be used for illustration; they only represent a choice of the possible ap-plications.


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The regulator determines the tem-peratures T1, T2 and T3 measured by the 3 sensors and compares the resulting tem perature difference ∆T(actual) with the preadjusted tempe-rature differences ∆T(set). If the diffe-rence is higher than ½∆T(set), the valve is opened and the pump is operated (with pump speed control). The store is at the most loaded up until the adjusted maximum temperature. Priority can be given to one of both stores. If no priority is given to one of the stores, both stores are loaded up until their maximum tem peratures are reached (parallel loading).The sensor (T4) can additionally be used for measuring purpose or for after-heating function (see 6.4).

6.3 Solar system with 1 collector and 2 stores (controlled by valves, parallel loading)

6.4 Solar system with 1 collector and 2 stores and thermostat function

Compared with example 6.3, in this case the thermostat function of the regulator is used. If the adjusted temperature (adjusted by potentio-meter) for the 4th sensor is underrun (sensor terminal „thermostat“), the actuator which is connected to relay output R4 (relay output „thermostat“) is operated until the temperature has increased to the treshold value (plus selected hysteresis).

Documents

RESOL EL2 · 2015. 9. 25. · RESOL EL2 115 442 60 RESOL EL2 - full kit - incl. 4 temperature sensors Pt1000 (1 x FKP6, 3 x FRP6) 115 442 70 • universal temperature differential