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Fault finding and diagnostics

6 720 808 928 (2017/06)

64

9.6.4

Heat Interface Unit function test menu

▶ Enter the

Service

menu and navigate through the menus and select

the

Diagnosis

menu.

▶ Navigate through the

Diagnosis

menu and select the

Function test

menu.

▶ Navigate through the

Function test

menu and select the

Heat

Interface Unit

menu.

▶ Select the parameter and adjust to test the valve.

9.7

Central heating pump test

To check the pump operation of the central heating pump
▶ Set the central heating rotary switch to the pump (

) position.

– Ensure the central heating rotary switch is returned to its original

position for normal central heating operation.

9.8

Heat meter (if fitted)

The integrator display an error message with the 3 letters “Err” and a
code. If several errors occur at the same time, the different codes are
shown sequentially.

The error is displayed in the first position of the display menu. It will still
be possible to select all the other display menus by pressing the
navigation button, refer to section 6.8.

If the navigation button is no longer pressed for a period of 3 minutes,
the error code automatically appear again in the first position of a display
menu. Display of an error automatically disappears when the error is no
longer present.

• Err. 1

– Flow higher that 1.2 x qs or defective hydraulic sensor.

• Err. 2

– Measured temperature outside the homologated range or

temperature sensor is defective.

Fig. 80 Error display

9.9

Component resistance characteristics

9.9.1

Flow/return temperature NTC sensors

9.9.2

DHW NTC wet sensor

9.9.3

Outdoor weather compensation sensor

Heat Interface Unit
parameter

Description

DHW

Set DHW control valve position (%).

• 0%(closed - 100% (fully open)

CH

Set CH control valve position (%).

• 0%(closed - 100% (fully open)

Table 41

6720808928-56.1W

o

1

Resistance (

Ω

)

Temperature ( °C)

29529

0

18787

10

12257

20

8186

30

5586

40

3889

50

Table 42 Central heating/district sensors

Resistance (

Ω

)

Temperature ( °C)

14772

20

11981

25

9786

30

8047

35

6653

40

5523

45

4608

50

3856

55

3243

60

2744

65

2322

70

1990

75

1704

80

1464

85

1262

90

1093

95

950

100

Table 43 DHW wet sensor

Resistance (

Ω

)

Temperature ( °C)

2392

-20

2088

-16

1811

-12

1562

-8

1342

-4

1149

0

948

4

842

8

781

10

642

15

528

20

436

25

Table 44 Outdoor weather compensation sensor

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Содержание Worcester Greenstar HIU

Страница 1: ...maintenance instructions Heat Interface Unit Greenstar HIU HIU E HIU E Plus HIU KE Plus 6720808928 00 1Wo For connection to a district heating system supplying heating and domestic hot water 6 720 808 928 2017 06 UK IE ...

Страница 2: ...nnections 27 5 3 3 Access to electrical connections 27 5 3 4 Cable retainer clamps 28 5 4 Frost protection 28 5 5 By pass function 29 5 6 Limit return temperature 29 6 Commissioning 30 6 1 Cleaning the primary circuit 30 6 2 Flushing kit accessory 30 6 3 Filling and venting the unit 30 6 3 1 Integral keyless filling link 30 6 3 2 External filling link not supplied with appliance 31 6 4 Control uni...

Страница 3: ... shooting guide 60 9 3 HIU Control unit LED indications 61 9 4 Control valve fault indication 62 9 4 1 Action of control valve during an error 62 9 4 2 Control valve calibration 62 9 5 Circulating pump fault indication 62 9 6 Sense II EMS controller Diagnosis menu 63 9 6 1 Operating the service menu 63 9 6 2 Heat Interface Unit diagnosis menu 63 9 6 3 Heat Interface Unit diagnosis functions 63 9 6...

Страница 4: ... work carried out Risk of electrical shock Any electrical work or maintenance must only be carried out by qualified registered person Before carrying out any work on electrical components isolate them from the power supply 230 V AC fuse circuit breaker and secure against unintentional reconnection Appliance operation This appliance can be used by children aged from 8 years and above and persons wi...

Страница 5: ...only be carried out by a qualified electrician Before starting electrical work Ensure that the electricity supply is safely isolated and secure to prevent inadvertent re connection Information on safe isolation can be found in the Health and Safety Executive Guidance HSG85 Using test equipment approved to GS38 confirm that the electricity supply is disconnected Refer to the manufacturer s informat...

Страница 6: ...work can be routed down behind the back of the HIU Pre plumbing kit available Model Heat meter Differential pressure control valve Summer by pass Keyless filling link assembly Flushing valve Vertical pipe kit Heat meter adaptor kit Domestic hot water output KW 1 1 Domestic hot water output values are for a temperature rise of 40K Domestic hot water flow rate l m 2 2 Domestic how water flow rate va...

Страница 7: ...its intended use may also invalidate the manufacturer s guarantee 2 4 Declaration of conformity This product in design and operation conforms to the European Directives and supplementary national requirements Compliance is demonstrated by the CE marking You can request the declaration of conformity for the product To do so send your request to the address on the back of the manual The appliance is...

Страница 8: ...n fittings Pressure Relief Valve installer connection elbow 6 Pre payment scheme kit 2 7 Appliance dimensions and hydraulic connections Fig 4 Casing dimensions and hydraulic connections 1 Cold mains inlet 22mm 2 Domestic Hot Water outlet 22mm 3 District heating supply 22mm 4 District heating return 22mm 5 Central heating flow 22mm 6 Central heating return 22mm 7 Pressure relief valve 15mm 67208089...

Страница 9: ...ain point central heating flow 14 Drain point central heating return 15 Pressure relief valve central heating 16 Central heating return connection 17 Central heating flow connection 18 District heating return connection 19 District heating supply connection 20 Domestic Hot Water outlet connection 21 Cold mains inlet connection 22 Filter and drain point district heating 23 Heat meter flow sensor co...

Страница 10: ...l control system 9 Limiter connection pre wired link remove link to connect limit thermostat for under floor heating circuit protection 10 Mains 230V supply 11 Circulating pump 12 Flow sensor NTC central heating 13 Return sensor NTC district heating 14 Central heating control valve 15 Domestic Hot Water control valve 16 Supply sensor NTC district heating 17 Domestic Hot Water outlet sensor NTC 18 ...

Страница 11: ...ow 1 Return sensor NTC district heating Green 2 Green 1 Not used Control panel fuse Table 3 63 N 4 3 2 1 2 1 2 1 4 3 2 1 4 3 2 1 2 1 2 1 2 1 Connections Symbol Function Limiter thermostat under floor safety cut off Potential free 230 V feed to external controls modules Live output L Neutral output N Earth output 230 V supply to the appliance Live input L Neutral input N Earth input Not used Sense ...

Страница 12: ...ion 6 720 808 928 2017 06 12 2 10 Designation of components Fig 7 Designation of components 6720808928 02 2Wo 1 2 7 3 6 5 4 3 8 9 39 38 10 11 13 14 32 31 27 28 15 12 16 17 19 18 20 22 23 30 29 25 24 26 21 36 37 35 33 34 ...

Страница 13: ... drain point district heating 21 Heat meter flow sensor point 22 Domestic Hot Water outlet 23 Supply sensor NTC district heating 24 Cold mains inlet 25 Optional position for pressure gauge pressure gauge can be moved from position 28 here 26 Domestic Hot Water safety valve 27 Domestic flow turbine and flow regulator 28 Pressure gauge 29 Domestic Hot Water outlet sensor NTC 30 Expansion vessel conn...

Страница 14: ...g side bar 10 10 10 10 Pressure relief valve setting secondary heating side bar 3 3 3 3 Maximum working pressure domestic hot water side bar 10 10 10 10 pH value district water supply approximate 7 9 7 9 7 9 7 9 Expansion vessel l 5 5 5 5 Expansion vessel charge bar 0 75 0 75 0 75 0 75 District Temperature 80 C Primary flow rate l s 0 24 0 24 0 16 0 16 Primary return temperature C 21 1 21 1 22 2 2...

Страница 15: ...sure relief valve setting secondary heating side bar 3 3 3 3 Maximum working pressure domestic hot water side bar 10 10 10 10 pH value district water supply approximate 7 9 7 9 7 9 7 9 Expansion vessel l 5 5 5 5 Expansion vessel charge bar 0 75 0 75 0 75 0 75 District Temperature 80 C Primary flow rate l s 0 16 0 16 0 16 0 16 Primary return temperature C 22 2 22 2 22 2 22 2 Primary pressure drop k...

Страница 16: ...ehotwater temperatures due to a failure condition The domestic hot water outlet temperature is adjustable between 30 C 60 C on the heat interface unit control unit 1 During a central heating demand the domestic hot water control valve 16 remains closed and the central heating control valve 4 modulates allowing district water to flow through the central heating heat exchanger 3 to maintain the pre ...

Страница 17: ...of a failure condition a limiterthermostatmustbefittedontotheflowpipetotheunder floor circuit and wired into the control unit figure 6 This switches off the central heating pump in the event of an over temperature condition A single under floor heating circuit can be controlled without the need for an external mixing valve Secondary circuit connections valves All system connections taps and mixing...

Страница 18: ...rain Internal PRV discharge The PRV discharge pipe may terminate internally to a safe position such as a waste pipe or soil pipe provided that the following conditions are met The material used must be capable of taking the maximum temperature provided by the District Heating primary flow The discharge must be directly or indirectly visible and will not discharge onto the occupants of the premises...

Страница 19: ...aintenance clearances NOTICE Risk of damage to system or appliance Debris from the system can damage the appliance and reduce efficiency Failure to comply with the guidelines for the use of water treatment with the appliance will invalidate the appliance guarantee Before installation ensure that the central heating system is cleaned and thoroughly flushed in accordance to the standards and guideli...

Страница 20: ...4 7 1 Unmixed central heating with radiators Fig 13 Option 1 Control of radiator heating system with Sense II EMS controller example Fig 14 Option 2 Control of radiator heating system with 230V programmable room thermostat example Fig 15 Minimum Installation and Maintenance clearances Description Dimensions mm 1 Compartment height 930 4 Compartment width 450 5 Above the appliance 30 6 Either side ...

Страница 21: ...t under floor safety cut off Potential free Sense II connection EMS2 Room control Not polarity sensitive Outdoor temperature sensor Not polarity sensitive 6720808928 40 1Wo T 6720808928 50 1Wo LR L EMS 2 1 2 1 Connections Symbol Function Limiter thermostat under floor safety cut off Potential free 230 V feed to external time and temperature control 230V programmable room thermostat Switch live dem...

Страница 22: ...teshowstherelativepositionsof thepipe workconnections thesupportbracketand mounting frame fixings Fix the wall mounting template to the wall 1 in the desired position Drill the fixing holes 2 for the support bracket indicated on the wall template Drill the fixing holes 3 for the mounting frame indicated on the wall template Remove the wall mounting template Fig 20 Template 6720808928 04 1Wo 390 65...

Страница 23: ...on valves are closed on the district heating return 1 and central heating flow connections 3 Unscrew the blanking plugs 4 from the district heating return 1 and central heating flow connections 3 Fit the filling link filter and O ring seals Place the filter 7 inside the inlet of the filling link ensuring that the mesh is inside the filling link assembly 6 Fit the O ring seals 5 onto the inlet and ...

Страница 24: ...mple cold mains inlet 2 Stop valve 3 Check valve 4 Test point 5 Hose union 6 Central heating flow pipe 7 Cold mains inlet pipe 5 1 6 Flushing valve accessory installation Aclose coupled flushing by passvalveaccessory isavailableand canbe fittedbehindthemountingframedirectlyintothedistrictheatingsupply and return connections The flushing valve 1 can be fitted with district pipe work connections ins...

Страница 25: ...ns Blue PTFE washers 3 for the Domestic water connections Fig 28 Service valves sealing washers 5 2 Hanging the appliance Installing the main unit Lift and locate the hanging point 1 of the appliance onto the centre hook 3 on the support bracket 2 Ensure the pipe connections fit into the isolation valve connections Ensure the unit is level and engaged on the support bracket loosely fit isolation v...

Страница 26: ...230V AC 50Hz This appliance must not be connected to a three phase supply The wiring between the appliance and the electrical supply must comply with the latest IET wiring regulations that apply to wiring a fixed appliance Type A RCDs must be employed where additional protection is required External fuse 5 Amps to BS1362 The appliance must be earthed The isolator must have contact separation of 3m...

Страница 27: ...electrical connections NOTICE Risk of equipment damage Only 230V room thermostats or 230V programmable room thermostats can be used with the HIU units for external time and temperature control The 230V time and temperature controls must only be wired to the HIU and not from an external 230V source Connections Symbol Function Limiter thermostat under floor safety cut off Potential free 230 V feed t...

Страница 28: ... categories that are system frost protection and unit frost protection System frost protection only if a Sense II is permanently installed The central heating circulation pump is activated as soon as the compatible EMS BUS controller outdoor sensor sends a frost protection signal which can be triggered by a low room temperature or a low outside temperature Internal frost protection The central hea...

Страница 29: ... avoided by limiting the hot water flow through the HIU the return temperature is measured and the CH control valve closed if the return flow temperature is too high AlthoughthelimitreturnflowfunctionisofferedasaspecialHIUfeature it should not be necessary if the system is designed correctly If high return temperatures are experienced it may be for example that the radiator surface areas are too s...

Страница 30: ...he domestic hot water control valve to open then any air can be vented out using the manual air vents at the top of the plate heat exchanger Open the central heating flow isolation valve Open the central heating return isolation valve Pull the lever 1 down to start the filling the central heating system Monitor the pressure gauge needle 2 When the needle reaches between 1 to 1 5 bar on the gauge 3...

Страница 31: ...pen then anyair can beventedoutusingthemanual airventsat thetopof the plate heat exchanger Checkthepressureandtopupthecentralheatingsystemifrequired Repeat this process until there is no more air in the system and the operating pressure remains stable at between 1 to 1 5 bar When venting is complete Ensure that all manual air vents are fully closed Check for any leaks Fig 41 6 4 Control unit The c...

Страница 32: ...ow flashing HIU starting up No DHW rotary switch position 0 DHW function is turned off No CH rotary switch position 0 CH function is turned off Green DHW rotary switch position 30 35 40 45 55 60 DHW normal running at required set point Green CH rotary switch position 30 35 40 50 60 70 80 CH normal running at required set point Green flashing DHW rotary switch position DHW in pump service or calibr...

Страница 33: ...n for approximately 10 seconds Fig 46 Key lock 6 6 2 Pump operational status and view pump curve setting The pump displays the current operating status 1 during normal running It can also display the current pump curve setting 2 Pressthebuttononthepumptoviewthecurrentpumpcurvesetting The default pump curve setting is PP3 highest proportional pressure curve After approximately 2 seconds the LED ind...

Страница 34: ...t proportional pressure curve PP2 intermediate proportional pressure curve PP3 highest proportional pressure curve default setting The head pressure is reduced at falling heat demand and increased at rising heat demand Display Indication Performance in of P1 maximum One green LED flashing Standby onlyexternal controlled 0 One green LED one yellow LED Low performance 0 25 One green LED two yellow L...

Страница 35: ... of the Selector will only switch on the backlight of the display The keys selector must therefore be pressed adjusted again to make a change Opening the service menu Press the menu key until the service menu is displayed Closing the service menu Ifnosub menu isopen pressthe Back key to switch to the standard display home screen or Press and hold the Back key for a few seconds to switch to the sta...

Страница 36: ... circulation pump Ensure that the DHW circulation pump is set to On Following checking DHW circulation pump is enabled you will need to set the DHW circ pmp op mode Navigate through the DHW system I and select DHW circ pmp op mode Set DHW circ pmp op mode to On Rejecting the change Press the selector to activate the marked entry or to confirm the change Turn the selector to highlight Continue and ...

Страница 37: ...ion time The next step in the Screed drying function Enter the Service menu and navigate through the menus and select the Heating settings menu Navigate through the Heating settings and select Screed drying Navigate through the Screed drying and select Screed dry system Set Screed dry system to Yes Heat Interface Unit settings Parameter Description DHW control valve bypass Electronic by pass keep ...

Страница 38: ...red A total of 18 monthly values of heat energy are volume are memorized in the integrator Powered remote M Bus ThepoweredremoteM Buscommunicationinterfaceisaserialinterface which permits communication between different M Bus devices via a central M Bus station The M Bus protocol is compliant with standard EN1434 3 By default the primary address will be configured with the address 0 and the second...

Страница 39: ...ature Low temperature Delta temperature Actual flow Actual power Time of device Date of device Running hours Software version LCD test Error 5 figure 53 Error code To enter the category required press and hold the navigation button for approximately 2 seconds To cycle through the displayed data pressing the navigation button repeatedly Once all the data has been displayed for the category the disp...

Страница 40: ...ll be transmitted on the corresponding output cable S1 S2 Electrical characteristics of the pulse outputs open collector 1Hz 500ms The supplied cable should not be shortened Pulse outputs can be read by pre payment systems or other building level energy monitoring systems Connect the pulse output cable directly to the monitoring system terminals following any instructions supplied by the energy mo...

Страница 41: ... Alkalinity HCO3 70 o 70 300 300 o Sulfate SO4 2 70 70 300 o 300 HCO3 SO4 2 1 1 o Electrolytic conductivity μS cm 10 o 10 500 500 o pH 6 0 o o 6 0 7 5 o 7 5 9 0 9 o Ammonia NH3 2 2 20 o 20 o Chlorides Cl 300 300 o Free Chlorides Cl2 1 1 5 o 5 o Hydrogen sulfide H2S 0 05 0 05 o Free aggressive carbon dioxide CO2 5 5 20 o 20 Total hardness dH 4 4 20 20 30 o 30 Nitrate NO3 100 100 o Iron Fe 0 2 0 2 o...

Страница 42: ...6 3 7 3 8 3 0 2 9 2 8 2 7 2 6 2 5 2 4 2 3 2 2 2 1 2 0 1 9 1 8 1 7 3 3 3 4 3 5 3 0 2 9 2 8 2 7 2 6 2 5 2 4 2 3 2 2 2 1 2 0 1 9 1 8 1 7 1 6 1 5 3 1 3 2 3 3 3 7 3 9 3 8 4 0 3 0 2 9 2 8 2 7 2 6 2 5 2 4 2 3 2 2 2 1 2 0 1 9 1 8 1 7 2 8 3 2 3 3 3 4 2 7 2 6 2 5 2 4 2 3 2 2 2 1 2 0 1 9 1 8 1 7 1 6 1 5 11 10 6720808928 25 1Wo Kv 1 7 m hr Kv 1 3 m hr Kv 1 3 m hr Kv 1 1 m hr l s l h 200 225 250 300 350 400 45...

Страница 43: ...andard unit Differential pressure control valve and heat meter 10 Domestic hot water standard performance range 11 Domestic hot water high performance range Domestic hot water example The domestic hot water performance chart figure 55 page 42 shows an example for calculating the domestic hot water performance a l m Domestic hot water flow rate 12 l m b Supply temperature 45 C Δ35K flow 65 C 45 C Δ...

Страница 44: ... 2 33 34 35 60 70 80 90 150 100 50 40 30 20 15 9 10 7 8 6 5 4 3 2 1 5 1 0 9 0 8 0 6 0 7 0 5 0 4 0 3 80 90 100 150 200 70 60 50 40 30 20 15 8 9 10 7 6 5 4 3 2 1 5 0 7 0 8 0 9 1 0 6 0 5 90 80 70 60 50 40 30 20 15 10 9 8 7 6 5 4 3 2 1 5 1 0 9 0 8 0 7 0 6 0 5 100 90 80 70 60 50 40 30 20 15 10 9 8 7 6 5 4 3 2 1 5 1 0 9 0 8 0 7 50 55 60 65 70 75 80 85 90 C 2 Kv 1 7 m hr Kv 1 4 m hr Kv 1 3 m hr Kv 1 1 m ...

Страница 45: ...essure kPa Standard unit Differential pressure control valve and heat meter Central heating example The central heating performance chart figure 56 page 44 shows an example for calculating the central heating performance a C Supply temperature 65 C b 50 30 C 15 0 kW Return temperature 34 8 C c l s l h Supply volumetric flow rate 0 123l s 442 8l h d kPa Supply differential pressure Standard unit 6 ...

Страница 46: ...0 65 70 75 80 85 90 l s l h 1 C 2 P kPa 3 4 5 6 7 8 9 10 6 5 4 3 2 1 5 1 0 9 0 7 0 8 0 6 0 4 0 5 0 3 0 15 0 2 0 1 0 09 0 08 0 07 8 9 10 15 7 6 5 4 3 2 1 5 0 8 0 9 1 0 7 0 6 0 5 0 3 0 4 0 15 0 2 10 15 20 9 8 7 6 5 4 3 2 1 5 1 0 9 0 8 0 7 0 6 0 5 0 4 0 3 0 2 0 15 20 10 15 9 8 7 6 5 4 3 2 1 5 1 0 9 0 8 0 7 0 6 0 5 0 4 0 3 0 2 Kv 1 7 m hr Kv 1 4 m hr Kv 1 3 m hr Kv 1 1 m hr 45 50 60 70 80 90 110 120 1...

Страница 47: ...o achieve the required nominal district flow rate Check that the LED indication lights on top of the domestic hot water control valve are indicating correctly See table 12 Check that the LED indicator lights at the top of the HIU control unit are indicating correctly see table 9 If the nominal district flow rate cannot be achieved check the differential pressure across the district flow and return...

Страница 48: ...gle zone under floor circuit unmixed over temperature protection Network isolated indirect without internal pump Single zone radiator circuit unmixed single zone under floor circuit mixed over temperature protection 5 Fill the central heating system and check for leaks 6 Pressurise the central heating and record the value bar 7 Check for leaks during operation 8 Measure and record values District ...

Страница 49: ...rmostatic radiator valves Yes No Automatic by pass valve fitted to system Yes No 11 Measure and record values Domestic hot water Is hot water available at all outlets Yes No Domestic cold water inlet temperature C Domestic hot water outlet temperature C Domestic hot water flow rate l min Domestic hot water output kW Supply flow temperature C Supply return temperature C Supply volumetric flow rate ...

Страница 50: ...ist The product must be correctly installed and commissioned in accordance with the Installation instruction for your product and meet the requirements of the Benchmark initiative if applicable The product must be maintained inspected serviced in accordance with the manufacturer s product instructions by a Bosch Thermotechnology Ltd or other competent Engineer Proof of inspection servicing may be ...

Страница 51: ... lift the cover 1 off the mounting frame Fig 59 Removing the cover 7 1 2 Draining the appliance District and central heating system Isolate the appliance from the district and central heating system using the appliance isolation valves Connectasuitablehosefirmlytotherequireddrainpointandrunthe hose outside to a suitable point or container Turn the drain valve anti clockwise to open the drain Turn ...

Страница 52: ...Supply flow rate at meter domestic hot water demand l m Domestic hot water outlet temperature C Domestic flow rate l m Comments Signature Inspection 04 Date Engineer name Company name Telephone Number Supply return temperature central heating mode C Secondary heating ΔT C Supply flow temperature domestic hot water mode C Supply return temperature domestic hot water mode C Supply flow rate at meter...

Страница 53: ... rate at meter domestic hot water demand l m Domestic hot water outlet temperature C Domestic flow rate l m Comments Signature Inspection 09 Date Engineer name Company name Telephone Number Supply return temperature central heating mode C Secondary heating ΔT C Supply flow temperature domestic hot water mode C Supply return temperature domestic hot water mode C Supply flow rate at meter domestic h...

Страница 54: ...s that have been disturbed are renewed When replacing ensure the correct plate heat exchanger is fitted Ensure the bracket securing screws are evenly tightened when refitting Fig 63 Plate heat exchanger removal CAUTION Accessing internal components Isolate the district heating and the electrical mains supplybeforestartinganyworkontheapplianceand observe all relevant safety precautions NOTICE Risko...

Страница 55: ...moval Refer to figure 66 Undo the connection pipes 5 and remove the differential pressure control valve 4 from the upper and lower pipe work Undo the sensing tube connection 6 on the differential pressure control valve 4 To refit follow the above in reverse Ensure any seals that have been disturbed are renewed Fig 66 Differential pressure control valve removal 8 5 Circulating pump Refer to figure ...

Страница 56: ...Refer to figure 70 Ensure the domestic hot water circuit is fully drained Disconnect the electrical connection 4 from the sensor 1 Withdraw the spring clip 3 Remove the sensor 1 from the housing To refit follow the above actions in reverse Hot water safety valve Refer to figure 70 Ensure the domestic hot water circuit is fully drained Undo the connection pipes 2 Remove the safety valve To refit fo...

Страница 57: ...tion 1 14 l min pink 39 1 kW 2 21 l min red 58 6 kW 8 10 Summer by pass if fitted Refer to figure 73 Ensure the appliance is fully drained Remove the securing clip 2 Undo the connection pipe 1 Remove the summer by pass 3 To refit follow the above in reverse Ensure any seals that have been disturbed are renewed and the securing clip 2 is fully engaged Fig 73 Summer by pass removal 8 11 District and...

Страница 58: ...ons cover 3 by releasing the latches 5 using a thin bladed screwdriver Fig 75 Control unit replacement Before the control unit can be replaced refer to figure 76 Unplug connectors from the control unit Remove cables and associated strain reliefs taking care not to damaged them To refit follow the above in reverse Ensure all connectors strain reliefs are securely fitted Fig 76 Removing connectors a...

Страница 59: ...pen control valve manually using CH rotary switch on HIU control unit section 6 4 Replace control valve if necessary District supply temperature too low Check that the district supply temperature is correct for the required heat output Section 6 11 Central heating performance charts District flow rate is too low Check that the district flow rate is correct for the required heat output Section 6 11...

Страница 60: ...necessary DHW temperature too low or varies excessively at the tap HIU Control unit incorrectly set or faulty Ensure that the DHW temperature set point is set correctly on the HIU controller section 6 4 Replace control unit if necessary DHW flow turbine faulty Check electrical connections to flow turbine Replace if necessary Faulty DHW control valve or dirt inside valve body causing low flow or no...

Страница 61: ...ction 6 4 Replace control valve if necessary Faulty DHW safety valve Replace DHW safety valve Cross leaking DHW plate heat exchanger Replace DHW plate heat exchanger Reason or Error Left LED DHW Right LED CH Outcome Outdoor temperature sensor error No No No set point is set in case of weather compensated control CH function does not detect a heat demand CH flow temperature sensor error Red CH and ...

Страница 62: ... Valve moves back to normal operation If the control valve has finished its calibration process but is still in calibration mode the valve will move to fully open position and remains there for 10 minutes or until calibration mode is exited Manuallysetting the rotary switch for the control valve onthe control unit to the required set point 9 5 Circulating pump fault indication If the circulating p...

Страница 63: ...nd maximum Setting a value with a slider slider shown in display Turn the selector to highlight an entry Press the selector to confirm the selection The input field and the slider are enabled Turn the selector to move the slider change setting value between minimumand maximum e g for DHW temperature Multiple selection Turn the selector to highlight an entry Press the selector to select the entry P...

Страница 64: ...on 6 8 If the navigation button is no longer pressed for a period of 3 minutes theerrorcodeautomaticallyappearagaininthefirstpositionofadisplay menu Display of an error automatically disappears when the error is no longer present Err 1 Flow higher that 1 2 x qs or defective hydraulic sensor Err 2 Measured temperature outside the homologated range or temperature sensor is defective Fig 80 Error dis...

Страница 65: ...6 720 808 928 2017 06 65 Notes ...

Страница 66: ...6 720 808 928 2017 06 66 Notes ...

Страница 67: ...6 720 808 928 2017 06 67 Notes ...

Страница 68: ...osch Group is a brand name of Bosch Thermotechnology Ltd worcester bosch co uk 6 720 808 928 2017 06 WORCESTER BOSCH GROUP TECHNICAL SUPPORT 0330 123 3366 APPOINTMENTS 0330 123 9339 SPARES 0330 123 9779 LITERATURE 0330 123 9119 TRAINING 0330 123 0166 SALES 0330 123 9669 8716117751 8716117751 ...

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