A.O. Smith TWI 35-130, TWI 45-190 service manual Operation of the device

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2Operation of the device

2.1	Introduction	This chapter will cover in the given order:
		• General operation of the device;
		• Heating cycle of the device;
		• Security of the device;
		• Safety of the installation.
2.2	General operation	The ﬁgure shows a cross section of the device.
	of the device

Cross section of the device

Legends IMD-0527

1. Temperature sensor / ECO

2.Insulating layer

3.Air pressure switch

4.Burner

5. Venturi

6. Air supply pipe

7. Gas control

8. Cover plate

9. Hot surface igniter

10. Fan

11. Thermostat

12. Hot water outlet

13. Heat exchanger

14. Tank

15. Combustion chamber

16. Cold water inlet

17. Concentric measuring tube

18. Air supply hose

19. Flue gas discharge

20. Siphon

21. Transformer 230 VAC-120 VAC

22. Drain valve

23. Connector

24. Transformer 120 VAC-24 VAC

25. Electronic control

26. Thermostat board

27. Inspection window

IMD-0527 RO

Instruction manual TWI 35-130 G/TWI 45-190 G

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Contents 35-130 45-190 Your installer Page Page Copyright 2007 A.O. Smith Water Products Company Page Errors InstallationMaintenance Operation of the deviceWarranty certiﬁcate Table of contentIntroduction What to do when you smell gas RegulationsAbout the device Target groups IntroductionChapter Target groups Description InstallationThis chapter contains the terms of warranty Warranty certiﬁcateIntroduction This chapter will cover in the given order Operation of the deviceHeating cycle Operation of the deviceSecurity of the device Introduction Air pressure switch Security of the water temperatureGas control 4 FanVented installation Unvented installation3 T&P valve Packaging InstallationInstallation Working area Dimension Description TWI Dimensions of the deviceDescription Unit TWI Dimension Description TWIVented Hot water side Cold water sideCirculation piping Condensation drainageRequirements for ﬂue gas discharge material Air supply and ﬂue gas discharge IntroductionDevice types Concentric connections Device types DescriptionDevice Diameter Maximum length Maximum num Ber of 90 bends Practical example of concentric ﬂue gas discharge ExampleSubject Description SpeciﬁcationsDevice Diameter Maximum running length Parallel connectionsBend Practical example of parallel ﬂue gas discharge ExampleDevice with parallel ﬂue gas discharge material Preparation Electrical connectionConnector block Isolating transformer Check and adjust the CO2-value Connect the mains voltageGas control Checking procedureAdjust the CO2-value Conversion to another gas category Conversion to another gas category Unvented FillFill vented installations Fill the device Fill unvented installationsDrain Drain unvented InstallationsDrain vented Start up Opening the gas valve 3.5 Connections diagramStart up Introduction You can Shut downFor a short time Electrically isolateShut down Introduction Distinction is made between General errors ErrorsErrors visible on the control Water leakage Symptom Cause Solution Remark Gas smellExplosive ignition Hot water Symptom Cause Solution Remark Insufﬁcient or noLight pulses Cause Solution Remark Troubleshooting table for errors visible on the controlSee 12.2 Electrical circuit diagram Light pulses Cause Solution Remark SL3TWI Introduction Prepare maintenance MaintenanceMaintenance 11.1 Warranty general Warranty certiﬁcate11.2 Warranty tank 11.3 Conditions11.6 Claims Warranty certiﬁcate11.7 Obligations SmithAnnex Annex Electrical circuit diagramWiring Annex Connect IndexIndex User WarrantyPage 0308 489 R1.0