A.O. Smith TWI 35-130 Light pulses Cause Solution Remark SL3, See 12.2 Electrical circuit diagram

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

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Light pulses	Cause	Solution		Remark

3 (SL3)	No gas supply	1.	Open the mains gas supply valve and/or the manual gas valve	Contact your installation engineer for restoring the gas supply.
Three ignition			for the gas control.
attempts without		2.	Check the pre-pressure on the gas control.
success		3.	If necessary, restore the gas supply.

	Air in the gas pipe	Bleed the gas pipe.		Contact your installation engineer for replacing the required parts.

	No gas supply to	1.	Check if the gas valve switches.
	burner	2.	Replace the gas control if necessary.

	Error in the hot	1.	Check if the hot surface igniter has been properly connected.	Contact the installation engineer in case of reoccurring errors.
	surface igniter circuit		See (12.2 “Electrical circuit diagram”).	Contact the installation engineer for replacing the required parts.
		2.	Check the cabling of the hot surface igniter.
		3.	Check the voltage over the hot surface igniter. This should be
			115 VAC.
		4.	Measure the resistance over the hot surface igniter. This
			should be between 45 and 400 Ohms.
		5.	Replace the hot surface igniter if necessary.

	Phase and Zero	Correctly connect the Phase and the Zero (3.9 “Electrical
	incorrectly connected	connection”). The device is phase-sensitive.

	Error in the ionisation	1. Check if the hot surface igniter has been properly connected.
	circuit		See (12.2 “Electrical circuit diagram”).
		2. Check the cabling of the hot surface igniter.
		3. Check if the ground wire of the burner has been properly
			connected.
		4. Replace the hot surface igniter if necessary.

	Supply voltage too low	Check the supply voltage. This should be 230VAC (-15% +10%).

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 smell Explosive 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