A.O. Smith TWI 35-130, TWI 45-190 service manual Gas control, Checking procedure

Page 33

Gas control

Legends

Not mentioned numbers are not applicable.

1. screws

2. cover plate

3.sealing cap

4. CO2 setting screw

5. setting hole

IMD 0535 R0

3.11.1Checking procedure

1.Position the probe of the CO2-gauge into the ﬂue gas discharge duct of the concentric venturi tube.

2.Open the gas supply and bleed the air from the gas system.

3.Switch on the voltage of the device using the main switch of the device.

4.Turn the thermostat clockwise until the device starts up.

5.After the red light is lit, wait for about 2 minutes before reading the CO2-gauge.

If the CO2-value does not correspond with the value given in the table (3.4.3 “gas data”), you can adjust the CO2-value following the procedure (3.11.2 “Adjust the CO2-value”).

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

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Image 33

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 contentWhat to do when you smell gas Regulations IntroductionAbout 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 deviceOperation of the device Heating cycleSecurity of the device Introduction Air pressure switch Security of the water temperatureGas control 4 FanUnvented installation Vented 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 Installations Drain unventedDrain vented Start up Opening the gas valve 3.5 Connections diagramStart up Introduction You can Shut downFor a short time Electrically isolateShut down Errors Introduction Distinction is made between General errorsErrors visible on the control Symptom Cause Solution Remark Gas smell Water leakageExplosive 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