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Summary of Contents for A.O. Smith TWI 35-200
- Page 1 Twister Condensing Stainless Steel Water Heater TWI 35-200/45-200 Installation, User and Service Manual...
- Page 2 Data is subject to change. A.O. Smith Water Heaters A.O. Smith Europe Unit B7-B8 Armstong Mall De Run 5305 T : 0870 267 6484 Southwood Business Park PO Box 70 sales@aosmith.co.uk Farnborough Hampshire 5500 AB Veldhoven www.aosmith.co.uk GU14 ONR UK...
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Page 3: Preface
Refer to the appendix Warranty (see 13.7) for the warranty provisions. Liability User A.O. Smith accepts no liability when the water heater is not used correctly and requires the user to: • Read this manual carefully and obey the instructions. -
Page 4: Compliance
CE-marking and all necessary documentation to obey these regulations. See the compliance section. (on page 4) A.O. Smith accepts no liability for claims from third parties when: • The instructions for the correct installation of the water heater are not obeyed. -
Page 5: Contact Information
Contact information If you have any comments or questions, please contact: A.O. Smith Water Products Company Adress: PO Box 70 5500 AB Veldhoven The Netherlands Telephone: 0870 - AOSMITH (free) 0870 - 267 64 84 General: +31 40 294 25 00... -
Page 7: About This Manual
About this manual Scope This manual gives information about safe and correct use of the water heater and how installation, maintenance and service activities have to be done correctly. You must obey the instructions in this manual. Caution Read this manual carefully before you start the water heater. It can cause personal injury and damage to the water heater when you do not read the manual and/or do not obey the instructions. -
Page 8: Document Identification
Caution Obey the caution instructions 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 Language Version 0313279... -
Page 9: Table Of Contents
Table of Contents Preface..................3 Copyright................3 Trademarks............... 3 Warranty................3 Liability................3 Compliance............... 4 Regulations............... 4 Contact information............5 About this manual............... 7 Scope................7 Target group..............7 Notation conventions............7 Document identification............8 User part..............13 Introduction................15 Safety..................17 Interface................... 19 Operator interface............19 3.1.1 Control Switch..............19 3.1.2... - Page 10 Turn off the water heater........... 24 4.2.1 Turn off for a short period..........24 4.2.2 Isolate from the mains............24 4.2.3 Turn off for a long period........... 24 Installation, Maintenance and Service part....25 Introduction................27 About the water heater............. 27 Working principle..............27 Safety..................29 Safety instructions............29...
- Page 11 8.8.1 Preparation..............48 8.8.2 Mains power..............49 8.8.3 External ON mode switch (optional)........49 8.8.4 Finalization..............49 Commissioning..............49 8.9.1 Filling................49 8.9.2 Air pressure differential............. 50 8.9.3 Gas supply pressure............50 8.9.4 value................51 8.9.5 Turn on the water heater........... 52 8.10 Decommisioning............... 52 8.10.1 Turn off the water heater...........
- Page 12 11.3.2 Clean the condensate drain..........68 11.4 Gas-side maintenance............68 11.4.1 Clean the burner.............. 69 11.4.2 Assemble the burner............70 11.4.3 Clean the air inlet filter............70 11.5 Finalization..............71 Troubleshooting................ 73 12.1 Errors and warnings............73 12.1.1 General errors..............73 12.1.2 Displayed errors............... 75 12.1.3 Warnings.................
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Page 13: User Part
User part 0313279_TWISTER II_UKUK_V1.1, 18-02-2019... -
Page 15: Introduction
Introduction The Twister water heater stores and heats water for sanitary purposes. Cold water enters the bottom of 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. - Page 16 User part...
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Page 17: Safety
Safety A.O. Smith cannot be held responsible for damages or injuries which can be lead back to: • Failure to follow the instructions provided in this manual. • Carelessness during use or maintenance of the water heater. Every user must study the user part of this manual and must follow the instructions in this part of the manual strictly. - Page 18 User part...
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Page 19: Interface
Interface Operator interface The operator interface consists of: • a control switch (see 3.1.1) on the front side of the water heater, between the doors. • a (touchscreen) display (see 3.1.2) to navigate through the menu and on which settings, functions, values and errors can be viewed and entered. The display is completely menu-driven and enables the user to change settings and to verify the status and history of the water heater. -
Page 20: Display Buttons
3.1.2.1 Symbols on the display The symbols on the display give visual information about the status of the water heater. Symbol Explanation Water heating is disabled End of water heating (stand-by) Water temperature drops (during water heating and when in stand-by) Water temperature rises (during water heating and when in stand-by) There is a heat demand... -
Page 21: Status Of The Water Heater
Button Function Scroll up / Raise Scroll down / Lower Status of the water heater During operation, the display shows the status of the water heater. Fig. Display Tank Temperature 60°C Operating Setpoint 60°C Status: Stand-by MENU The following status texts can appear on the display: Status text Explanation Stand-by... -
Page 22: Operating Modes
Status text Explanation Heat demand There is a heat demand. External switch The external switch is active. 3.2.1 Operating modes The Twister has 3 operating modes: • OFF mode (see 3.2.1.1) • ON mode (see 3.2.1.2) • External ON mode (EXT mode) (see 3.2.1.3) 3.2.1.1 OFF mode In the OFF mode the water heater is de-activated. -
Page 23: Use
Turn on the water heater 4.1.1 Switch to ON mode To start the water heater: Make sure the water heater connects to the mains power supply. Set the control switch on the front of the water heater (see 1) to I. Note It is possible that the water heater starts immediately when you turn on the water heater. -
Page 24: Turn Off The Water Heater
Open the Temperatures submenu. Fig. Temperatures submenu Operating Setpoint 65°C > Hysteresis 5°C > Tank Temperature 35°C BACK Open the Operating Setpoint control screen. Fig. Operating setpoint control screen Setpoint 60°C 40°C 85°C ACCEPT BACK Change the water temperature setpoint: Use [+] to increase the setpoint. -
Page 25: Installation, Maintenance And Service Part
Installation, Maintenance and Service part 0313279_TWISTER II_UKUK_V1.1, 18-02-2019... - Page 26 User part...
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Page 27: Introduction
Introduction About the water heater The Twister water heater is intended for heating water for sanitary purposes. The Twister is a condensing gas–fired storage water heater with a fan in the air intake. The flue gasses transfer their heat to the water through an efficient heat exchanger. The water heater has a concentric venting connector and can function as an open or as a room- sealed water heater. - Page 28 Fig. Twister water heater 1. Water inlet 2. Heat exchanger 3. Water outlet When the temperature is too low, the water heater starts a operating cycle: The controller detects a "heat demand". The fan starts pre-purging. The air proving switch closes when the air pressure differential is sufficient. The spark plug is activated.
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Page 29: Safety
Safety Safety instructions For safety instructions on the use of the water heater, refer to Safety (see 2) in the User part of this manual. Warning Installation, maintenance and service must be carried out by a qualified engineer in compliance with the general and local regulations imposed by the gas, water and power supply companies and the fire brigade. -
Page 30: Instructions On The Water Heater
Note Any leakage from the tank and/or connections can cause damage to the immediate environment or floors below the level of the boiler room. Install the water heater above a waste water drain or in a suitable metal leak tray. The leak tray must have an appropriate waste water drain and must be at least 5 cm deep with a length and width of at least 5 cm larger than the water heater. -
Page 31: Safety Devices
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 The water heater controls the water temperature using a temperature sensor: sensor (1) T > 90 ºC (blocking error), max. temperature. - Page 32 T&P valve The T&P valve prevents excessive pressure and temperature in the tank. Temperature and pressure relief valve 1 - All water heaters have a T&P valve connection. A.O. Smith recommends to use a T&P valve. Installation, Maintenance and Service part...
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Page 33: Environmental Aspects
Environmental aspects 6.4.1 Recycling The packaging material is environmentally friendly, recyclable and relatively easy to discard. 6.4.2 Disposal Old end-of-life appliances contain materials that need to be recycled. When you discard devices at the end of their service life, you must obey local legislation related to waste disposal. - Page 34 Installation, Maintenance and Service part...
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Page 35: Water Heater
Water heater Structure of the water heater The water heater has the following main components: Controller (9) The controller monitors and 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 heater. - Page 36 Fig. Components water heater 1. Temperature sensor 9. Controller 2. Display 10. Spark plug 3. Tank 11. Gas control valve 4. Heat exchanger 12. Venturi 5. Combustion chamber 13. Fan 6. Condensate drain 14. Flame probe 7. Drain valve 8. Burner Installation, Maintenance and Service part...
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Page 37: Installation
For more safety instructions, refer to Safety instructions (see 6.1). Packaging A.O. Smith recommends to unpack the water heater at or near its intended location. Remove the packaging material carefully to prevent damage to the water heater. Conditions The water heater is suitable for room-sealed and for open combustion. -
Page 38: Working Clearances
Water composition Hardness > 1.00 mmol/l: (alkaline earth ions) German hardness > 5.6° dH French hardness > 10.0° fH English hardness > 7.0° eH CaCO > 100 mg/l Conductivity > 125 µS/cm Acidity (pH value) 7.0 < pH value < 9.5 Note If the water specifications differ from the specifications in the table, the tank protection cannot be guaranteed, refer to Warranty (on page 3). -
Page 39: Water Connections
Fig. Installation diagram 1. Pressure reducing valve (mandatory if the mains water pressure is too high) 3. T&P valve (optional) 4. Stop valve (recommended) 5. Non-return valve 6. Circulation pump (optional) 9. Drain valve 10. Manual gas valve 11. Service stop valve 12. -
Page 40: Hot Water Connection
8.4.2 Hot water connection Note Insulate long hot water pipes to prevent unnecessary energy loss. Install the hot water connection: Install a stop valve (11) in the hot water outlet pipe for service reasons. If applicable, install a temperature gauge (12). Install a T&P valve (3). -
Page 41: Venting System
This manual does not discus installation type B23. When you need a B23 system, contact A.O. Smith for more information. Caution Always make sure that the venting system is mounted into an area suitable for the correct type of installation. - Page 42 Fig. Venting systems IMD-1353 R0 Installation, Maintenance and Service part...
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Page 43: C13/C33 Concentric Systems
+0,3 -0,6 -0,7 Diameter air inlet +0,5 +0,5 (Dn 125) (Dn 125) Description parts A.O. Smith A.O. Smith Part number Part number Wall terminal set 0310759 0302515 A wall terminal (1), a 500 mm concentric pipe and a 90° bend... - Page 44 Fig. Example concentric venting system Caution During installation, obey the instructions delivered with the sets of air supply components and the flue gas discharge components. Make sure that the venting system does not exceed the maximum number of 45º and 90º bends and the maximum pipe length. Caution Use a run-off of 50 mm per meter towards the water heater.
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Page 45: C13/C33 Parallel Systems
Diameter flue gas outlet +0,6 +0,3 -0,6 -0,7 Diameter air inlet Description parts A.O. Smith A.O. Smith Part number Part number Wall terminal set 0310730 A wall terminal (1), an adapter, a 500 mm parallel pipe and a 90° bend... - Page 46 Fig. Example parallel venting system Refer to the table for the correct pipe dimensions of the C13 or a C33 parallel venting systems. Description Unit TWI 35–200 TWI 45–200 Diameter flue discharge/ mm/mm 2 x 80 air inlet Maximum length air inlet Maximum length flue gas outlet m 45°-bend equivalent...
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Page 47: C43/C53/C63 Systems
The flue gas terminal must comply to the EN 1856-1 requirements. The maximum allowable recirculation rate is 10% under wind conditions. Contact A.O. Smith for more information and/or part numbers of 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. -
Page 48: Electrical Connections
Refer to C13/C33 parallel systems (see 8.7.2) for the A.O. Smith part numbers. The same parts can be used for the C43, C53 and C63 parallel systems. Use the "adapter box concentric to parallel - water heater side" (part number 0312209) for C63 parallel systems. -
Page 49: Mains Power
8.8.2 Mains power Note The water heater is supplied without a power cable and isolator. Use a power cable with cores of at least 3 x 0,75 mm and a double-pole isolator with a contact gap of at least 3 mm. Connect the water heater to the mains power supply: Pull the power cable through the grommet. -
Page 50: Air Pressure Differential
8.9.2 Air pressure differential Check the air pressure differential across the air pressure switch: Disconnect hose H of the air proving switch and connect this side of the hose to the + of the pressure gauge. Disconnect hose L of the air pressure switch and connect this side of the hose to the - of the pressure gauge. -
Page 51: Co 2 Value
Use the pressure gauge to read the supply pressure and compare it with the value from the appendix Gas details (see 13.3). Note Consult the mains gas supply company if the supply pressure is not correct. Take the water heater out of service until the supply pressure is correct, refer to section Decommissioning (see 8.10). -
Page 52: Turn On The Water Heater
Caution When the CO value is not correct, refer to General errors (see 12.1.1), CO value (at full load) is not correct. Do not use the water heater when the CO value is not correct and this is not caused by the restrictor, venturi, venting system or gas category: •... -
Page 53: Draining
8.10.2 Draining Refer to the installation diagram when you drain the water heater: Close the manual gas valve (10). If applicable, close the service stop valve (11) in the hot water pipe. Close the stop valve (10). Open the drain valve (9). Aerate the entire installation of air until the water heater is completely drained. - Page 54 Installation, Maintenance and Service part...
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Page 55: Conversion Of Gas Type
Conversion of gas type Caution Conversion of the water heater may only be carried out by a qualified person. Use a special conversion kit to converse the water heater when: • The water heater has to operate on a different family of gases (liquid petroleum gas or natural gas). - Page 56 Installation, Maintenance and Service part...
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Page 57: Settings
Settings 10.1 Display The display is completely menu-driven and enables the user to change settings and to verify the status and history of the water heater. For more information about how to use the display, refer to Operator interface (see 3). On the display, press [MENU] to enter the main menu. -
Page 58: Temperatures
Press on a line with a [>] to set the operating setpoint or to set the hysteresis. Press [BACK] to return to the previous screen. 10.2.1 Temperatures To change the temperature operating setpoint: From the Temperatures submenu open the Operating Setpoint control screen. Fig. -
Page 59: Appliance Status
10.3 Appliance Status The Appliance Status submenu shows detailed information on several parts of the appliance. Fig. Appliance status submenu Status: Water Heating Disabled Max Temperature Contact Disabled Air Proving Switch Disabled Igniter on Gas Valve on Flame Detected Target Blower RPM 0rpm Blower RPM 0rpm... -
Page 60: Set The Backlight Delay
Change the setting: Use [+] to increase the brightness. Use [-] to decrease the brightness. Press [ACCEPT] to confirm the value or press [BACK] to return to the previous screen. 10.4.2 Set the backlight delay To change the backlight delay: From the Display Settings submenu open the Backlight Delay control screen. -
Page 61: Appliance Information
10.5 Appliance information From the main menu, you can open the Appliance Information submenu. The Appliance Information submenu shows information about the operating history of the water heater. Fig. Display - Appliance Information Use the Appliance Information submenu to activate or deactivate the external ON mode switch and to set the ignition attempts. -
Page 62: Ignition Attempts
10.5.2 Ignition attempts To set the number of ignition attempts before the water heater shows an error: From the Appliance Information submenu open the Ignition Attempts control screen. Fig. Ignition attempts control screen Ignition Attemps 3 tries 3 tries 1 try ACCEPT BACK Change the setting:... -
Page 63: Error Occurrence
10.7 Error occurrence From the main menu, you can open the Error Occurrence submenu. The Error Occurrence submenu shows the amount of occurred errors of the water heater. Fig. Display - Error Occurrence Ignition Error High-Limit Thermostat Air Proving Switch Flame Detection Error Top Temperature Sensor Bottom Temperature Sensor... -
Page 64: Set The Service Mode
Use the "invisible" button on the home screen. Press this button for 10 seconds and the service menu will be visible. Fig. Location invisible service menu button Tank Temperature 35°C Operating Setpoint 60°C Status: Water Heating Disabled MENU Fig. Service menu screen Service Menu Service Mode No >... -
Page 65: Set The Fan Speed
10.9.2 Set the fan speed To change the fan speed: From the Service Menu submenu open the Blower RPM control screen. Fig. Blower RPM control screen Blower RPM ACCEPT BACK Use [+] and [-] to change the blower RPM setting. Press [ACCEPT] to confirm the value or press [BACK] to return to the previous screen. - Page 66 Installation, Maintenance and Service part...
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Page 67: Maintenance
To determine the correct interval, A.O. Smith recommends to do a system check on both the water and the gas side, three months after installation. -
Page 68: Preparation
11.3.1 Descale the tank If necessary, use a descaling agent to remove the scale and contamination from the tank. Contact A.O. Smith for advice on what descaling agent to use. 11.3.2 Clean the condensate drain To clean the condensate drain: Place a tray or towels under the condensate drain to collect water leakage. -
Page 69: Clean The Burner
11.4.1 Clean the burner Caution Be careful, the burner can be hot Caution Always replace the seal after removal of the burner Note Mind the ground cable! Remove the burner: Close the gas control valve, refer to Installation diagram 8.3. Disconnect the hoses (4, 5) from the air inlet pipe. -
Page 70: Assemble The Burner
Fig. Remove the burner. Use compressed air to remove all contamination from the outside to the inside of the burner. 11.4.2 Assemble the burner Assemble the burner again when the burner is cleaned. Note Before reassembly replace the gasket, bolts and washers. You can order a special gasket and mounting set at your supplier. -
Page 71: Finalization
Remove the filter (4) out of the rubber socket (2). Use a vacuum cleaner to clean the filter. Replace the filter in the rubber socket. Install the air supply pipe back onto the water heater. Place the secure pin. Caution The filter must be placed back into the rubber socket at all times. - Page 72 Installation, Maintenance and Service part...
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Page 73: Troubleshooting
Troubleshooting 12.1 Errors and warnings The water heater can have three different kinds of errors: • General errors (see 12.1.1), which are not displayed • Displayed errors (see 12.1.2), which are divided in two different groups: Lock out errors: when the cause is removed, you can reset the error to resume operation. - Page 74 Indication Cause Measure Water leakage There is a leakage from a threaded Tighten the threaded connection. water connection. There is a condensate leakage Make sure that the condensation water discharge is working properly. If necessary, correct the water discharge. There is a leakage from another nearby Trace the leakage.
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Page 75: Displayed Errors
Indication Cause Measure value is not The unit is not set for the correct gas Make sure that the gas type type corresponds with the information on correct the rating plate Make sure if the venturi restrictor has the correct diameter, refer to Gas details (see 13.3). - Page 76 Code and Cause Measure description XA5-XXXX The temperature in the tank is above Refer to indication X54-XXXX (see 12.1.3). 95ºC. (lock out error) Make sure that the wiring between Temperature error 1 and 4 of J9 is connected and not damaged.
- Page 77 Code and Cause Measure description Not enough pressure differential across Check, after each fix, if the error reappears. the air proving switch, due to: If the error reappears continue in finding the cause. venting system Measure the pressure differential malfunction condensation across the air proving switch, refer to discharge Air pressure differential.
- Page 78 Code and Cause Measure description XB2-XXXX No gas Make sure that the main gas supply valve is open. If necessary, open the (lock out error) valve. Ignition error Make sure that the manual gas supply Three unsuccessful valve, before the gas control valve, is ignition attempts.
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Page 79: Warnings
12.1.3 Warnings Note For the coding of the connections, refer to the Electrical wiring diagram (see 13.5). Indication Cause Remark X54-XXXX The temperature in the tank is above Tap off water, so the temperature 90°C. drops in the water heater. Temperature warning Make sure that there is no scale on the... - Page 80 Installation, Maintenance and Service part...
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Page 81: Appendices
Appendices 13.1 Technical details Description Unit TWI 35-200 TWI 45-200 General Capacity Empty Weight Maximum floor load Maximum operating pressure kPa (bar) 550 (5.5) 550 (5.5) Control thermostat - °C 40-85 40-85 adjustment range Control thermostat - °C default value Hysteresis upwards - °C... -
Page 82: Dimensions
Description Unit TWI 35-200 TWI 45-200 Supply voltage / Main VAC / Hz 230 (-15%, +10%) / 50 (+/- 1) frequency IP-class IP30 13.2 Dimensions Size Description Unit TWI 35-200 TWI 45-200 Dimensions water heater Height 1655 1655 Width Depth... - Page 83 Fig. Dimensions IMD-1349b R0 0313279_TWISTER II_UKUK_V1.1, 18-02-2019...
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Page 84: Gas Details
13.3 Gas details Description Unit TWI 35-200 TWI 45-200 Gas category 2H (G20) Diameter of the venturi restrictor Nominal Load (gross) 38.9 50.0 Nominal output 35.9 46.2 Supply pressure mbar (full load) vol% 9.0 ± 0.5 9.0 ± 0.5 (full load) vol% 4.8 ±... -
Page 85: Energy Labeling
13.4 Energy labeling Description Unit TWI 35-200 TWI 45-200 Declared load profile Load profile Energy efficiency class (Energy label) Energy efficiency Daily electricity consumption 0.249 0.277 Daily fuel consumption kWh GCV 25.816 26.274 Mixed water 40°C (V40) ∞ ∞ Additional load profile... -
Page 86: Electrical Wiring Diagram
13.5 Electrical wiring diagram Fig. Electrical wiring diagram Cable colors 11. Blue/White Components M. Earth connection burner flange 1. Brown 12. Brown/White A. Control R. Temperature sensor - top of tank) 2. Blue 13. Green/White B. Power supply board S. Temperature sensor 3. -
Page 87: Declaration Of Conformity
13.6 Declaration of conformity 0313279_TWISTER II_UKUK_V1.1, 18-02-2019... -
Page 88: Warranty
Article 2: Tank warranty If, after inspection and at the sole discretion of A.O. Smith, the stainless steel tank of a water heater supplied by A.O. Smith proves within five years of the original installation date to be leaking due to rust or corrosion occurring on the water side, then A.O. Smith shall offer to replace the defective water heater with an entirely new water heater of equivalent size and quality. - Page 89 (assemblies or parts of) water heaters supplied for replacement, other than the warranty expressly set out in these Articles. Under the terms of the supplied warranty, A.O. Smith is not liable for damage to persons or property caused by (assemblies or parts, or the glass-lined steel tank of) a (replacement) water heater that it has supplied.
- Page 90 Installation, Maintenance and Service part...
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Page 91: Index
Index Electrical wiring diagram...... 86 Switch to ON mode......23 Energy labeling........85 Environmental aspects......33 Error history........62 Error occurrence......... 63 Errors and warnings ......73 About the water heater......27 External ON mode....... 22 About this manual......... 7 External ON mode switch (optional)..49 Air pressure differential ....... - Page 92 Turn on the water heater...... 52 Notation conventions ......7 Use........... 23 Use external enable......61 User part..........13 OFF mode.......... 22 ON mode..........22 Operating modes.........22 Operator interface....... 19 Venting system........41 Packaging...........37 Performance check......67 Warnings..........79 Preface..........3 Warranty..........88 Preparation.........68 Water composition.......37 Water connections.......
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