A.O. Smith TWI 35-200 Installation, User And Service Manual Download Page 31

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6.3

Safety devices

Fig. Safety devices

1. Temperature sensor
2. Air proving switch
3. Gas control valve
4. Flame probe

Safety devices of the water heater:

Temperature
sensor (1)

The water heater controls the water temperature
using a temperature sensor:

T > 90 ºC (blocking error), max.
temperature.

T > 95 ºC (lock out error), for safety.

Gas control
valve

(2)

The gas control valve controls the gas supply to
the burner.

Air proving

witch

(3)

The air proving switch checks the air pressure
differential during post- and pre-purging. This
guarantees that there is sufficient air supply.

Flame probe (4)

The flame probe detects if there is a flame.

0313279_TWISTER II_UKUK_

V1.1, 18-02-2019

Summary of Contents for TWI 35-200

Page 1: ...Twister Condensing Stainless Steel Water Heater TWI 35 200 45 200 Installation User and Service Manual 0313279 R1 1 0819 EN...

Page 2: ...7 B8 Armstong Mall Southwood Business Park Farnborough Hampshire GU14 ONR UK T 0870 267 6484 sales aosmith co uk www aosmith co uk A O Smith Europe De Run 5305 PO Box 70 5500 AB Veldhoven The Netherla...

Page 3: ...r to Read this manual carefully and obey the instructions Ask your installation engineer for advise about the use of the water heater Make sure that the service and maintenance activities are done by...

Page 4: ...he European Standard for Gas fired storage water heaters for the production of domestic hot water EN89 The European ECO Design Directive The European Energy Labeling Directive Refer to the appendix De...

Page 5: ...500 AB Veldhoven The Netherlands Telephone 0870 AOSMITH free 0870 267 64 84 General 31 40 294 25 00 Fax 31 40 294 25 39 E mail info aosmith nl Website www aosmith co uk In the event of problems with y...

Page 6: ...6...

Page 7: ...n and maintenance procedures Target group The information in this manual applies to three target groups users installation engineers service and maintenance engineers The User part is intended for the...

Page 8: ...ions to prevent damage of the water heater Warning Obey the warning instructions to prevent danger of personal injury and serious damage to the water heater Document identification Article number Lang...

Page 9: ...t identification 8 User part 13 1 Introduction 15 2 Safety 17 3 Interface 19 3 1 Operator interface 19 3 1 1 Control Switch 19 3 1 2 Display 19 3 1 3 Display buttons 20 3 2 Status of the water heater...

Page 10: ...cycling 33 6 4 2 Disposal 33 7 Water heater 35 7 1 Structure of the water heater 35 8 Installation 37 8 1 Packaging 37 8 2 Conditions 37 8 2 1 Ambient conditions 37 8 2 2 Maximum floor load 37 8 2 3 W...

Page 11: ...eratures 57 10 2 1 Temperatures 58 10 2 2 Hysteresis 58 10 3 Appliance Status 59 10 4 Display settings 59 10 4 1 Set the display brightness 59 10 4 2 Set the backlight delay 60 10 4 3 Set the language...

Page 12: ...lter 70 11 5 Finalization 71 12 Troubleshooting 73 12 1 Errors and warnings 73 12 1 1 General errors 73 12 1 2 Displayed errors 75 12 1 3 Warnings 79 13 Appendices 81 13 1 Technical details 81 13 2 Di...

Page 13: ...User part 0313279_TWISTER II_UKUK_V1 1 18 02 2019 13...

Page 14: ...14...

Page 15: ...f the tank through the water inlet 1 The heated water leaves the tank at the top through the hot water outlet 2 To operate the water heater the display 3 and control switch 4 are used Fig Twister wate...

Page 16: ...16 User part...

Page 17: ...water heater Some propellants bleaching agents and degreasing agents etc disperse of explosive vapors and or cause accelerated corrosion If the water heater is used in a room where such substances are...

Page 18: ...18 User part...

Page 19: ...r heater 3 1 1 Control Switch With the control switch you can turn the water heater on I or off 0 Warning The power of the water heater stays on when the control switch is set to 0 3 1 2 Display The d...

Page 20: ...es during water heating and when in stand by There is a heat demand Pre and post purge Air pressure switch is closed A flame is detected Gas control valve is open Spark plug is activated enabled Error...

Page 21: ...e ventilator ventilates the combustion chamber Spark plug activated The spark plug starts to spark Gas valve on The gas valve is open Flame verification A flame is detected Inter Purge After ignition...

Page 22: ...switch is set in the position I 3 2 1 3 External ON mode In the external ON mode the water heater will respond to a heat demand when the relay switch is closed Use the menu to enable the external ON m...

Page 23: ...ssible that the water heater starts immediately when you turn on the water heater Note If necessary set the water temperature see 4 1 2 4 1 2 Set the water temperature To change the temperature setpoi...

Page 24: ...heater for less than 2 months set the control switch on the front of the water heater see 1 to 0 Warning The power of the water heater stays on when the control switch is set to 0 Note If the water he...

Page 25: ...Installation Maintenance and Service part 0313279_TWISTER II_UKUK_V1 1 18 02 2019 25...

Page 26: ...26 User part...

Page 27: ...ed water heater 5 2 Working principle Cold water enters the bottom of the tank through the water inlet 1 A heat exchanger 2 transfers the heat from the flue gasses to the water and the hot water leave...

Page 28: ...when the air pressure differential is sufficient 4 The spark plug is activated 5 The gas control valve opens and the gas air mixture is ignited 6 The water heater heats the water in the tank 7 When t...

Page 29: ...air supply components and the flue gas discharge components Make sure that the venting system does not exceed the maximum number of 45 and 90 bends and the maximum pipe length Caution Make sure that...

Page 30: ...ome safety instructions on its cover The text Read the installation instructions before installing the appliance The text Read the user instructions before putting the appliance into operation Also th...

Page 31: ...perature sensor T 90 C blocking error max temperature T 95 C lock out error for safety Gas control valve 2 The gas control valve controls the gas supply to the burner Air proving switch 3 The air prov...

Page 32: ...back flow of expansion water into the cold water main supply Pressure reducing valve The pressure reducing valve reduces the water mains pressure if necessary T P valve Temperature and pressure relie...

Page 33: ...be recycled When you discard devices at the end of their service life you must obey local legislation related to waste disposal Never discard your old device together with regular waste Put the devic...

Page 34: ...34 Installation Maintenance and Service part...

Page 35: ...manages all internal processes of the water heater for a safe operation Display 2 To control the water heater and to verify the status the touchscreen display has several buttons to operate the water...

Page 36: ...ature sensor 2 Display 3 Tank 4 Heat exchanger 5 Combustion chamber 6 Condensate drain 7 Drain valve 8 Burner 9 Controller 10 Spark plug 11 Gas control valve 12 Venturi 13 Fan 14 Flame probe 36 Instal...

Page 37: ...t damage to the water heater 8 2 Conditions The water heater is suitable for room sealed and for open combustion For these types of combustion you must comply with the local applicable directives and...

Page 38: ...fications in the table the tank protection cannot be guaranteed refer to Warranty on page 3 8 2 4 Working clearances Make sure that there is sufficient clearance to access the water heater 100 cm in f...

Page 39: ...e water connections see 8 4 install the condensate drain see 8 5 install the gas connection fill the water heater see 8 9 1 drain the water heater see 8 10 2 n 8 4 Water connections 8 4 1 Cold water c...

Page 40: ...pipe 8 5 Condensate drain Caution When the condensate drain is not connected to the waste water discharge by an open connection this can cause faults Caution Do not change the condensate drain or cau...

Page 41: ...air inlet and flue gas outlet in same pressure zone C43 Closed Water heaters on common air inlet and flue gas outlet concentric and or parallel in a multiple floor building C53 Closed Separate air inl...

Page 42: ...Fig Venting systems IMD 1353 R0 C43 C13 C53 B23 C33 42 Installation Maintenance and Service part...

Page 43: ...t number A O Smith Part number Wall terminal set A wall terminal 1 a 500 mm concentric pipe and a 90 bend 0310759 0302515 Wall terminal 0310757 0302516 Roof terminal set A roof terminal 2 a 1000 mm co...

Page 44: ...exceed the maximum number of 45 and 90 bends and the maximum pipe length Caution Use a run off of 50 mm per meter towards the water heater Refer to the table for the correct pipe dimensions of the C1...

Page 45: ...l pipe and a 90 bend 0310730 Wall terminal 0310708 0305016 Roof terminal set A roof terminal 2 an adapter a 1000 mm parallel pipe and a roof plate 0310712 Roof terminal 0310728 0305041 Adapter box con...

Page 46: ...wo times 80 mm This adapter 0312209 can be ordered at your supplier or wholesaler The use of a different adapter box may cause the water heater to malfunction Calculate the maximum length of the air i...

Page 47: ...the C43 C53 and C63 venting systems Concentric systems Refer to the table for the correct pipe dimensions of the C43 C53 and C63 concentric systems Description Venting material PP Venting material Alu...

Page 48: ...paration Remove the cover of the water heater to make the electrical section and the terminal block visible 1 Use a screw driver to remove the screws at the right side cover 1 2 Hinge the cover toward...

Page 49: ...heater 1 Fill the water heater see 8 9 1 2 Check the air pressure differential see 8 9 2 3 Check the gas supply pressure 8 9 3 4 Check the CO2 value see 8 9 4 5 Turn on the water heater see 8 9 5 8 9...

Page 50: ...et the control switch on the front of the water heater to 0 to turn off the water heater 7 Disconnect the pressure gauge 8 Reconnect the hoses of the air proving switch and the gas valve Fig Air press...

Page 51: ...as control valve 4 Gas supply pipe 8 9 4 CO2 value Check the CO2 value 1 Open the gas supply 2 Remove the cap 1 from the test nipple 2 of the flue gas outlet pipe 3 Place the measurement probe of the...

Page 52: ...cable set the temperature value back to the original value 10 Set the control switch on the front of the water heater to 0 to turn off the water heater 11 Remove the measurement probe of the CO2 meter...

Page 53: ...1 Close the manual gas valve 10 2 If applicable close the service stop valve 11 in the hot water pipe 3 Close the stop valve 10 4 Open the drain valve 9 5 Aerate the entire installation of air until...

Page 54: ...54 Installation Maintenance and Service part...

Page 55: ...You can order the conversion kit you need from the supplier of your water heater The conversion kit contains all the parts needed to do the conversion and a description of how to do the conversion The...

Page 56: ...56 Installation Maintenance and Service part...

Page 57: ...one Error Occurrence Restore Default Error History Temperatures Display Settings The main menu consists of 8 submenus Use the scroll bar on the right side to scroll through the menu Press on a line wi...

Page 58: ...ter heater does not start immediately when the water temperature is below the temperature setpoint To prevent that the water heater switches on and off too often there is a margin the hysteresis The s...

Page 59: ...No Target Blower RPM Blower RPM 10 4 Display settings The Display Settings submenu shows the settings for the display brightness the backlight delay and the language Fig Display settings submenu Pres...

Page 60: ...time that the backlight is on b Use to decrease the time that the backlight is on Note When the backlight delay is set to 240 s maximum value the backlight will be continuously on 3 Press ACCEPT to co...

Page 61: ...set the ignition attempts 10 5 1 Use external enable To change the status of the external ON mode switch 1 From the Appliance Information submenu open the Use External Enable control screen Fig Contr...

Page 62: ...reen 10 6 Error history From the main menu you can open the Error History submenu The Error History submenu shows the 9 most recent errors of the water heater and the point of time of these errors Pre...

Page 63: ...urn to the previous screen 10 8 Restore default From the main menu you can open the Restore Default submenu On the Restore Default submenu you can restore the settings to the factory default settings...

Page 64: ...the specific submenu Press BACK to return to the previous screen In order to stop the Service Mode the setting of the Service Mode must be set to No 10 9 1 Set the service mode To change the service...

Page 65: ...ting 3 Press ACCEPT to confirm the value or press BACK to return to the previous screen The fan will now operate according to the new setting Note The fan will reduce speed when going from Full Load M...

Page 66: ...66 Installation Maintenance and Service part...

Page 67: ...ting set can be ordered at your supplier This kit contains the necessary gaskets bolts and washers Look at the data plate for the correct ordering information 11 1 Performance check Check if the perfo...

Page 68: ...nse trap at the bottom of the condensate drain 3 Empty the condense trap and clean it with water 4 Make sure that there are no blockages in the condense trap 5 Make sure that there are no blockages in...

Page 69: ...er heater 5 Loosen the 4 screws and disconnect the gas supply pipe 7 6 Disconnect the hose 8 from the gas control valve 9 7 Loosen the three bolts 7 to disconnect the gas control valve 9 8 Take the ga...

Page 70: ...park plug and the flame rod onto the combustion chamber 2 Install the burner and fan with four nuts onto the combustion chamber 3 Install the gas control valve 4 Connect the hose to the gas control va...

Page 71: ...s correct refer to gas supply pressure 8 9 3 Fig Air inlet filter 11 5 Finalization When all maintenance activities are done place the cover back on the water heater 1 Place the cover on the water hea...

Page 72: ...72 Installation Maintenance and Service part...

Page 73: ...rnings see 12 1 3 Note It is possible to view the error history of the water heater refer to Error history see 10 6 12 1 1 General errors Note For the coding of the connections refer to the Electrical...

Page 74: ...and the air connector Make sure that the air connector is not damaged If necessary replace the air connector the air connector is correctly connected to the venturi If necessary tighten the clamp The...

Page 75: ...w 0 5 vol If necessary reconnect the venting system and change the necessary seals 12 1 2 Displayed errors Note For the coding of the connections refer to the Electrical wiring diagram Note Contact yo...

Page 76: ...t touch the tank If necessary replace the flame sensor Make sure that the combustion chamber is dry Make sure that the cables of the flame sensor are correctly connected If necessary replace the conne...

Page 77: ...the waste water discharge by an open connection Burner Make sure that the the burner is clean see 11 4 1 Measure the pressure differential across the air proving switch again If the pressure different...

Page 78: ...orrectly Make sure that the wiring of the flame probe is not damaged Measure the ionisation current This current must be a minimum of 60 A If necessary replace the wiring and or flame probe Supply vol...

Page 79: ...The temperature in the tank is above 90 C Tap off water so the temperature drops in the water heater Make sure that there is no scale on the temperature sensor If necessary replace the sensor Make su...

Page 80: ...80 Installation Maintenance and Service part...

Page 81: ...is upwards adjustment range C 0 0 Hysteresis upwards default value C 0 0 Hysteresis downwards adjustment range C 2 10 2 10 Hysteresis downwards default value C 5 5 Number of electrical anodes 0 0 Fan...

Page 82: ...655 D Width mm 560 560 E Depth mm 660 660 G Flue gas outlet Air inlet mm mm 80 125 80 125 Dimensions connections 1 Cold water supply connection female 1 1 2 Hot water outlet connection female 1 1 3 Ga...

Page 83: ...Fig Dimensions A D E 3 5 1 3 7 4 1 G 5 2 IMD 1349b R0 0313279_TWISTER II_UKUK_V1 1 18 02 2019 83...

Page 84: ...w rate flue gases nominal load kg h 63 81 Flue gas temperature nominal load C 65 75 Gas category 3P G31 Diameter of the venturi restrictor mm 6 00 6 00 Nominal Load gross kW 38 0 48 9 Nominal output k...

Page 85: ...fficiency 93 91 Daily electricity consumption kWh 0 249 0 277 Daily fuel consumption kWh GCV 25 816 26 274 Mixed water 40 C V40 l Additional load profile Load profile Energy efficiency class Energy la...

Page 86: ...d White D Gas control valve 5 White E External ON mode switch 6 Red Terminal block connections F Double poled isolator 7 Green A Earth G Control switch R Temperature sensor T1 top of tank S Temperatur...

Page 87: ...13 6 Declaration of conformity 0313279_TWISTER II_UKUK_V1 1 18 02 2019 87...

Page 88: ...lation and building codes rules and regulations in force at the time of installation The water heater remains installed at the original site of installation The water heater is used exclusively with d...

Page 89: ...ubmitted to the dealer from whom the water heater was purchased or to another authorised dealer for A O Smith Water Products Company products Inspection of the water heater as referred to in Articles...

Page 90: ...90 Installation Maintenance and Service part...

Page 91: ...68 Dimensions 82 Display 19 57 Display buttons 20 Display settings 59 Displayed errors 75 Disposal 33 Document identification 8 Draining 53 E Electrical connections 48 Electrical wiring diagram 86 En...

Page 92: ...ure 23 Settings 57 Status of the water heater 21 Structure of the water heater 35 Symbols on the display 20 T Target group 7 Technical details 81 Temperatures 57 58 Trademark 3 Trademarks 3 Troublesho...

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