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Viessmann SCU224 User Manual Download Page 30

© 

Viessmann 

5443203

|

 

30

SCU224

System layout 10

Arr 10

VBus

10

9

The controller calculates the temperature difference bet-
ween collector sensor S1 and tank sensor S2. If the diffe-
rence is larger than or identical to the adjusted switch-on 
temperature difference (DT O), the solar pump will be 
operated by relay 1, and the tank will be loaded until the 
switch-off temperature difference (DT F) or the maximum 
tank temperature (S MX) is reached.
If the maximum collector temperature (CMX) is reached,  the 
solar pump will be operated by relay 1 and the 3-way-valve 

S1

S2

S4 / TR

R1

S3

R2

Display Channels

Channel

Description

Terminal

Page

COL

x

Temperature collector

S1

37

TST

x

Temperature tank

S2

37

S3

x

Temperature sensor 3

S3

37

S4

x

Temperature sensor 4

S4

37

TR

x*

Temperature return sensor

S4

37

n %

x

Pump speed relay

R1

30

h P1

x

Operating hours R1

R1

38

h P2

x

Operating hours R2

R2

38

kWh

x*

Heat quantity kWh

-

38

MWh

x*

Heat quantity MWh

-

38

TIME

x

Time

-

34

will be operated by relay 2 in order to direct the surplus 
energy to a heat dump. For security purpose this will be 
carried out only if the tank temperature is below the non-
adjustable emergency shutdown of 200 °F.
Sensors S3 and S4 can optionally be connected for mea-
surement purposes. 
If energy metering (OHQM) is activated, sensor S4 has to 
be connected as return sensor.

Summary of Contents for SCU224

Page 1: ...ing Connection Application examples Operation Troubleshooting Thank you for buying this product Read this manual carefully to get the best perfomance from this unit Please keep this manual carefully 5443203 v1 0 02 2010 49011100 49011100 ...

Page 2: ...e Errors excepted Please pay attention to the following safety advice in order to avoid danger and damage to people and property Instructions Attention should be paid to valid national and local standards and regulations respective valid standards and directives Equipment to be installed and used in accordance with the rules of the National Electrical Code NEC or with Canadian Electrical Code CEC ...

Page 3: ...using plastic PC ABS and PMMA Protection type IP 20 EN 60529 Ambient temp 32 104 F 0 40 C Size 6 8 4 3 1 9 172 110 46 mm Mounting wall mounting mounting into patch panels is possible Display System screen for system visualization 16 segment display 7 seg ment display 8 symbols for system status and operating control lamp Operation by 3 push buttons at the front of the housing Functions Differentia...

Page 4: ...1 Î Î Drill and insert the lower wall plug Î Î Fasten the housing to the wall with lower fastening screw and tighten Î Î Complete wiring connections in accordance with termi nal allocations see chap 1 2 Electrical connection Î Î Place the cover back onto the housing Î Î Fasten the cover by means of the cross head screw 1 Installation upper fastening lower fastening VBus 1 2 Electrical connection p...

Page 5: ...using with the enclosed strain relief and the corresponding screws The controller is equipped with two semiconductor re lays to which loads such as pumps valves etc can be connected Relay 1 18 conductor R1 17 neutral conductor N 13 ground conductor Relay 2 16 conductor R2 15 neutral conductor N 14 ground conductor The power supply is to be carried out at the terminals 19 neutral conductor N 20 con...

Page 6: ...tion Terminal Page INIT x ODB initialization active 37 FLL x ODB filling time active 37 STAB x ODB stabilization in progress 37 COL x Temperature collector S1 37 TST x Temperature tank S2 37 S3 x Temperature sensor 3 S3 37 S4 x Temperature sensor 4 S4 37 TR x Temperature return sensor S4 37 n x Pump speed R1 R1 38 hP x Operating hours R1 R1 38 hP1 x Operating hours R1 if OBST is activated R1 38 hP...

Page 7: ... Ra 20 0 K 41 DTCF x Cooling switch off temperature difference 30 0 Ra 15 0 K 41 OSTC x Option tank cooling OFF 42 OHOL x Option holiday cooling OFF 42 THOL x Holiday cooling temperature 110 F 40 C 42 OCN x Option minimum limitation OFF 42 CMN x Minimum collector temperature 50 F 10 C 42 OCF x Option antifreeze OFF 42 CFR x Antifreeze temperature 40 0 F 4 0 C 42 O TC x Option tube collector OFF 44...

Page 8: ... INIT x ODB initialization active 37 FLL x ODB filling time active 37 STAB x ODB stabilization in progress 37 COL x Temperature collector S1 37 TST1 x Temperature tank 1 bottom S2 37 TSTT x Temperature tank 1 at the top S3 37 TST2 x Temperature tank 2 bottom S4 37 n1 x Pump speed R1 R1 38 n2 x Pump speed R2 R2 38 h P1 x Operating hours R1 R1 38 h P2 x Operating hours R2 R2 38 TIME x Time 34 Heat e...

Page 9: ...tion antifreeze OFF 42 CFR x Antifreeze temperature 40 0 F 4 0 C 42 O TC x Option tube collector OFF 44 TCST x OTC starting time 07 00 44 TCEN x OTC ending time 19 00 44 TCRU x OTC runtime 30 s 44 TCIN x OTC standstill interval 30 min 44 DT3O s Switch on temperature difference 3 12 0 Ra 6 0 K 10 DT3F s Switch off temperature difference 3 8 0 Ra 4 0 K 10 DT3S s Nominal temperature difference 3 20 0...

Page 10: ...3 Rise Adjustment range 2 40 Ra 1 20 K in steps of 2 Ra 1 K Factory setting 4 Ra 2 K Pump speed control A relative minimum pump speed can be allocated to the output R2 via the adjustment channel n2MN n2MN Pump speed control Adjustment range 30 100 in steps of 5 Factory setting 30 Note When loads which are not speed controlled e g valves are used the value must be set to 100 in order to deactivate ...

Page 11: ...perature limitation uses sensor 4 as reference sensor The maximum temperature limitation function provides a maximum tem perature setting usually to reduce scald risk in a storage tank If MX3O is exceeded relay 2 is switched off until the temperature at sensor 4 falls below MX3F The minimum temperature limitation uses sensor 3 as reference sensor The minimum temperature limitation function provide...

Page 12: ...perature tank 1 bottom S2 37 TSTT x Temperature tank 1 at the top S3 37 TDIS s Thermal disinfection temperature S3 37 S4 x Temperature sensor 4 S4 37 TR x Temperature return sensor S4 37 n1 x Pump speed R1 R1 38 h P1 x Operating hours R1 R1 38 h P2 x Operating hours R2 R2 38 kWh x Heat quantity kWh 38 MWh x Heat quantity MWh 38 CDIS s Countdown of monitoring period 38 SDIS s Starting time display ...

Page 13: ...4 TCRU x OTC runtime 30 s 44 TCIN x OTC standstill interval 30 min 44 OHQM x Option energy metering OFF 44 FMAX x Maximum flow 6 0 l 44 MEDT x Antifreeze type 1 44 MED x Antifreeze concentration 45 44 AH O s Switch on temp for thermostat 1 110 F 40 C 14 AH F s Switch off temp for thermostat 1 120 F 45 C 14 t1 O s Switch on time 1 thermostat 00 00 14 t1 F s Switch off time 1 thermostat 00 00 14 t2 ...

Page 14: ...C in steps of 1 0 Ra 0 5 K Factory setting 120 0 F 45 0 C t1 O t2 O t3 O Thermostat switch on time Adjustment range 00 00 23 45 Factory setting 00 00 t1 F t2 F t3 F Thermostat switch off time Adjustment range 00 00 23 45 Factory setting 00 00 In order to block the thermostat function for a certain period there are three time frames t1 t3 If the function should be active between 6 00 and 9 00 set t...

Page 15: ...DIS is continuously exceeded for the entire heating period DDIS S3 is used as the reference sensor and displayed as TSTT PDIS Monitoring period Adjustment range 0 30 0 24 h dd hh Factory setting 01 00 This function is used for protecting the upper tank zone against Legionella by activating the backup heating Reference sensor for the thermal disinfection is S3 Î Î To activate the function select On...

Page 16: ...nel Description Terminal Page COL x Temperature collector S1 37 TSTB x Temperature tank 1 bottom S2 37 TSTT x Temperature tank 1 at the top S3 37 S4 x Temperature sensor 4 S4 37 TR x Temperature return sensor S4 37 n x Pump speed relay R1 38 hP1 x Operating hours R1 R1 38 hP2 x Operating hours R2 R2 38 kWh x Heat quantity kWh 38 MWh x Heat quantity MWh 38 TIME x Time 34 tures S1MX S2MX are reached...

Page 17: ... 0 Ra 20 0 K 41 DTCF x Cooling switch off temperature difference 30 0 Ra 15 0 K 41 OSTC x Option tank cooling OFF 42 OHOL x Option holiday cooling OFF 42 THOL x Holiday cooling temperature 110 F 40 C 42 OCN x Option minimum limitation OFF 42 CMN x Minimum collector temperature 50 F 10 C 42 OCF x Option antifreeze OFF 42 CFR x Antifreeze temperature 40 0 F 4 0 C 42 PRIO x Priority 2 43 tLB x Break ...

Page 18: ...Display Channels Channel Description Terminal Page COL x Temperature collector S1 37 TST1 x Temperature tank 1 bottom S2 37 TST2 x Temperature tank 2 bottom S3 37 S4 x Temperature sensor 4 S4 37 TR x Temperature return sensor S4 37 n x Pump speed relay R1 38 hP1 x Operating hours R1 R1 38 hP2 x Operating hours R2 R2 38 kWh x Heat quantity kWh 38 MWh x Heat quantity MWh 38 TIME x Time 34 S2MX are r...

Page 19: ...r temperature 230 F 110 C 41 OSYC x Option system cooling OFF 41 DTCO x Cooling switch on temperature difference 40 0 Ra 20 0 K 41 DTCF x Cooling switch off temperature difference 30 0 Ra 15 0 K 41 OSTC x Option tank cooling OFF 42 OHOL x Option holiday cooling OFF 42 THOL x Holiday cooling temperature 110 F 40 C 42 OCN x Option minimum limitation OFF 42 CMN x Minimum collector temperature 50 F 10...

Page 20: ...es DT1F DT2F or the maximum Arr 6 Tank 1 Tank 2 S4 Display Channels Channel Description Terminal Page COL x Temperature collector S1 37 TST1 x Temperature tank 1 bottom S2 37 TST2 x Temperature tank 2 bottom S3 37 S4 x Temperature sensor 4 S4 37 n1 x Pump speed R1 R1 38 n2 x Pump speed R2 R2 38 h P1 x Operating hours R1 R1 38 h P2 x Operating hours R2 R2 38 TIME x Time 34 tank temperatures S1MX S2...

Page 21: ...r 270 F 130 C 40 OCC x Option collector cooling OFF 41 CMX x Maximum collector temperature 230 F 110 C 41 OSYC x Option system cooling OFF 41 DTCO x Cooling switch on temperature difference 40 0 Ra 20 0 K 41 DTCF x Cooling switch off temperature difference 30 0 Ra 15 0 K 41 OSTC x Option tank cooling OFF 42 OHOL x Option holiday cooling OFF 42 THOL x Holiday cooling temperature 110 F 40 C 42 OCN x...

Page 22: ...R2 S1 S2 S3 Arr 7 Display Channels Channel Description Terminal Page COL1 x Temperature collector 1 S1 37 TST x Temperature tank S2 37 COL2 x Temperature collector 2 S3 37 S4 x Temperature sensor 4 S4 37 n1 x Pump speed R1 R1 38 n2 x Pump speed R2 R2 38 h P1 x Operating hours R1 R1 38 h P2 x Operating hours R2 R2 38 TIME x Time 34 relay 2 and the tank will be loaded until the switch off temperatur...

Page 23: ... 41 OSYC x Option system cooling OFF 41 DTCO x Cooling switch on temperature difference 40 0 Ra 20 0 K 41 DTCF x Cooling switch off temperature difference 30 0 Ra 15 0 K 41 OSTC x Option tank cooling OFF 42 OHOL x Option holiday cooling OFF 42 THOL x Holiday cooling temperature 110 F 40 C 42 OCN1 x Option minimum limitation collector 1 OFF 42 CMN1 x Minimum temperature collector 1 50 F 10 C 42 OCN...

Page 24: ... x ODB initialization active 37 FLL x ODB filling time active 37 STAB x ODB stabilization in progress 37 COL x Temperature collector S1 37 TSTB x Temperature tank 1 bottom S2 37 TSTT x Temperature tank 1 at the top S3 37 TSFB x Temperature solid fuel boiler S4 37 n1 x Pump speed R1 R1 38 n2 x Pump speed R2 R2 38 h P1 x Operating hours R1 R1 38 h P2 x Operating hours R2 R2 38 TIME x Time 34 A solid...

Page 25: ...iday cooling OFF 42 THOL x Holiday cooling temperature 110 F 40 C 42 OCN x Option minimum limitation OFF 42 CMN x Minimum collector temperature 50 F 10 C 42 OCF x Option antifreeze OFF 42 CFR x Antifreeze temperature 40 0 F 4 0 C 42 O TC x Option tube collector OFF 44 TCST x OTC starting time 07 00 44 TCEN x OTC ending time 19 00 44 TCRU x OTC runtime 30 s 44 TCIN x OTC standstill interval 30 min ...

Page 26: ...ustment range 2 40 Ra 1 20 K in steps of 2 Ra 1 K Factory setting 4 Ra 2 K Pump speed control A relative minimum pump speed can be allocated to the output R2 via the adjustment channel n2MN n2MN Pump speed control Adjustment range 30 100 in steps of 5 Factory setting 30 Note When loads which are not speed controlled e g valves are used the value must be set to 100 in order to deactivate pump speed...

Page 27: ... maximum temperature limitation function provides a maximum tem perature setting usually to reduce scald risk in a storage tank If MX3O is exceeded relay 2 is switched off until the sensor falls below MX3F TIn Arr 8 this func tion uses sensor 3 as reference sensor The minimum temperature limitation uses sensor 4 as reference sensor The minimum temperature limitation function provides a minimum tem...

Page 28: ...hannel Description Terminal Page INIT x ODB initialization active 37 FLL x ODB filling time active 37 STAB x ODB stabilization in progress 37 COL x Temperature collector S1 37 TSTB x Temperature tank 1 bottom S2 37 TSTT x Temperature tank 1 at the top S3 37 TRET x Temperature heating circuit S4 38 n x Pump speed relay R1 38 hP1 x Operating hours R1 R1 38 hP2 x Operating hours R2 R2 38 TIME x Time ...

Page 29: ...h on temperature difference 40 0 Ra 20 0 K 41 DTCF x Cooling switch off temperature difference 30 0 Ra 15 0 K 41 OSTC x Option tank cooling OFF 42 OHOL x Option holiday cooling OFF 42 THOL x Holiday cooling temperature 110 F 40 C 42 OCN x Option minimum limitation OFF 42 CMN x Minimum collector temperature 50 F 10 C 42 OCF x Option antifreeze OFF 42 CFR x Antifreeze temperature 40 0 F 4 0 C 42 O T...

Page 30: ...4 TR R1 S3 R2 Display Channels Channel Description Terminal Page COL x Temperature collector S1 37 TST x Temperature tank S2 37 S3 x Temperature sensor 3 S3 37 S4 x Temperature sensor 4 S4 37 TR x Temperature return sensor S4 37 n x Pump speed relay R1 30 h P1 x Operating hours R1 R1 38 h P2 x Operating hours R2 R2 38 kWh x Heat quantity kWh 38 MWh x Heat quantity MWh 38 TIME x Time 34 will be ope...

Page 31: ...cy temperature collector 270 F 130 C 40 CMX s Maximum collector temperature 230 F 110 C 41 OCN x Option minimum limitation OFF 42 CMN x Minimum collector temperature 50 F 10 C 42 OCF x Option antifreeze OFF 42 CFR x Antifreeze temperature 40 0 F 4 0 C 42 O TC x Option tube collector OFF 44 TCST x OTC starting time 07 00 44 TCEN x OTC ending time 19 00 44 TCRU x OTC runtime 30 s 44 TCIN x OTC stand...

Page 32: ...through the display channels by pressing buttons 1 and 2 Accessing the adjustment channels Î Î Scroll down in the display menu and press the forward button 1 for approx two seconds after you have reached the last display item When an adjustment value is shown on the display SET is indicated to the right of the channel name Î Î Press the Set button 3 in order to access the ad justment mode SET star...

Page 33: ...p 3 way valve The flow direction or the actual switching position is shown Heating circuit Tanks 1 and 2 with heat exchanger Backup heating with burner symbol Temperature sensor System screen system screen green everything OK red green flashing initialization phase manual operation red flashing sensor fault sensor symbol is flashing quickly 2 3 Flashing codes LED flashing codes System screen flash...

Page 34: ... Save the adjustment by pressing button 3 again The symbol stops flashing Î Î Press button 1 or 2 to switch to the next or previous channel 1 2 3 SET The three pushbuttons of the BS Plus controller The commissioning menu consists of the following 6 channels 1 Language Î Î Adjust the desired menu language in this channel dE German En English LANG Language selection Selection dE En Factory setting E...

Page 35: ... made in the other channels will be lost Therefore changing the system layout is always followed by a security enquiry Only confirm the security enquiry if you are sure that you wish to change the system layout selection Security enquiry Î Î To confirm the security enquiry press button 3 Arr 9 solar system layout with heating circuit return preheating Arr 10 standard solar system layout with heat ...

Page 36: ... Factory setting 140 F 60 C Note The controller is also equipped with a non adjustable emergency shutdown function which will shut the system down if the tank reaches 200 F 95 C 6 Minimum pump speed Î Î Adjust a minimum speed for the pump nMN n1MN n2MN Pump speed control Adjustment range 30 100 in steps of 5 Factory setting 30 Note If loads which are not speed controlled e g valves are used the va...

Page 37: ...rol function S3 temperature sensor 3 S4 temperature sensor 4 S3 S4 Sensor temperatures Display range 40 500 F 40 260 C Indication of other temperatures Indicates the current temperature of the corresponding sensor TSFB temperature solid fuel boiler TRET temperature heating return preheating TR temperature return TSFB TRET TR Other mea sured tempe ratures Display range 40 500 F 40 260 C Note S3 and...

Page 38: ...vated The flow rate as well as the reference sensors S1 flow and S4 return are used for calculating the heat quantity sup plied It is shown in kWh in the channel kWh and in MWh in the channel MWh The overall heat quantity results from the sum of both values The accumulated heat quantity can be reset As soon as one of the display channels of the heat quantity is selected the symbol is permanently s...

Page 39: ...ull speed for 10 seconds Then the speed is reduced to the minimum pump speed value factory setting 30 If the temperature difference reaches the adjusted nominal temperature difference the pump speed increases by one step 10 If the difference increases by the adjustable rise value the pump speed increases by 10 respectively until the maximum pump speed of 100 is reached The response of the controll...

Page 40: ...re limitation Emergency shutdown of the collector If the adjusted collector emergency shutdown temperature EM EM1 EM2 is exceeded the controller switches off the solar pump R1 R2 in order to protect the system against overheating collector emergency shutdown A hysteresis of 20 Ra 10 K is set for the collector temperature limitation While the collector is in emergency shutdown flashing is shown on ...

Page 41: ...ure S MX S1MX and the switch on tempera ture difference DTCO is reached the solar system remains activated Solar loading is continued until either the tank temperature reaches 200 F 95 C emergency shutdown of the tank the temperature difference falls below the ad justed value DTCF or the collector emergency shutdown temperature EM is reached If the system cooling function is active and flashing is...

Page 42: ... order to protect the tank from frost damage CFR CFR1 CFR2 Antifreeze temperature Adjustment range 40 0 50 0 F 40 0 10 0 C in steps of 1 Ra 0 5 K Factory setting 40 0 F 4 0 C Tank cooling function When the tank cooling function is activated the controller aims to cool down the tank during the night in order to prepare it for solar loading on the following day If the adjusted maximum tank temperatu...

Page 43: ...ity is set to Su 1 or Su 2 solar loading of the subordinate tank will be aborted at once if the temperature in the priority tank tank 1 for Su 1 tank 2 for Su 2 falls below the adjusted maximum temperature If in that case the temperature difference between the priority tank and the collector is not sufficiently high solar loading will be stopped completely DTSE Spread temperature difference Adjust...

Page 44: ...en seconds of the runtime For the remaining runtime the pump will be run at the adjusted minimum speed nMN If the collector sensor is defective or the collector is blocked this function is suppressed or switched off In system layout 7 Arr 7 both collectors are operated independently from each other by means of this function If the tank is being loaded by one collector the other one is nevertheless...

Page 45: ...ODB is activated the pump will operate at 100 speed for the adjusted filling time tFLL in order to fill the system with fluid from the holding tank After tFLL pump speed will go down to the adjusted minimum pump speed nMn The switch off conditions will then be ignored for the stabilization time tSTB in order to avoid the system from shutting down prematurely If the function is activated the menu i...

Page 46: ...ration Temperatures and temperature differences in F and Ra are displayed without units If the indication is set to C the units are displayed with the values UNIT Temperature unit selection Selection F C Factory setting C Note Always adjust the operating mode back to Auto when the control and service work is completed Normal operation is not possible in manual mode Reset By using the reset functio...

Page 47: ... be checked with an ohmmeter In the following table the resistance values with the corresponding temperatures are shown Operating control lamp off Check the power supply Is it disconnected no The fuse of the controller could be blown It can be replaced after the front cover has been removed spare fuse is enclosed in the accessory bag yes Check the supply line and reconnect it C F Ω C F Ω 10 14 961...

Page 48: ...ocked yes no Clean it Heat exchanger too small yes Replace with correctly sized one no Plausibility control of the option tube collec tor special function Change Ton and Toff correspondingly Switch on temperature difference Ton to large no yes Non ideal position of the coll ector sensor e g flatscrew sensor instead of sensor in sensor wells no Pump is overheated but no heat transfer from the colle...

Page 49: ...mp 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 to high choose a value which makes more sense no Is the pump current enabled by the control ler yes Is the pump stuck Turn the pump shaft using a screwdriver now pas sable Pump is defective re place it Are the controller fuses o k Cont...

Page 50: ... balance values of the solar system over a long period of time The DL2 can be configured and read out with a standard internet browser via its integrated web interface For transmission of the data stored in the internal memory of the DL2 to a PC an SD card can be used The DL2 is appropriate for all controllers with VBus It can be connected directly to a PC or router for remote access and thus enab...

Page 51: ... Viessmann 5443203 51 SCU224 Notes ...

Page 52: ... our knowledge As faults can never be excluded please note Your own calculations and plans under con sider ation of the current standards should only be basis for your projects We do not offer a guarantee for the completeness of the drawings and texts of this manual they only represent some examples They can only be used at your own risk No liability is assumed for incorrect incomplete or false in...

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