A.O. Smith TWI 35-130, TWI 45-190 Start up, Opening the gas valve 3.5 Connections diagram

Page 41

7 Start up

7.1

Introduction

This chapter will cover in the given order:

 

 

 

 

 

 

•

Start up.

 

 

 

 

 

 

 

 

 

 

•

Heating cycle of the device.

 

 

 

 

7.2

Start up

Start up the device by:

 

 

 

 

 

 

 

 

 

 

1.

Filling the device (5 “Fill”).

 

 

 

 

 

 

2.

Opening the gas valve (3.5 “Connections diagram”).

 

 

3.

Switching on the voltage of the device using the main switch between the

 

 

 

device and the electricity mains.

 

 

 

 

 

 

4.

Setting the device to the desired temperature.

 

 

 

 

 

This device has been equipped with an electronic hot surface igniter that ignites

 

 

the burner. There are three LEDs indicating the different operating conditions.

 

 

Green:

the device is live.

 

 

 

 

 

 

Yellow:

a heat demand has been detected; this indicates the beginning of the

 

 

 

 

ignition cycle.

 

 

 

 

 

 

 

 

 

 

Red:

 

the gas valve is open.

 

 

 

 

7.3

Heating cycle of the

Heating cycle of the device

 

 

 

 

 

device

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SupplyToestelpowervoorziento the

 

 

OngeveerPre-heat35forsec.

 

 

 

 

 

 

 

 

van voedeviceingsspanning

 

 

aboutvoorgloeien35 seconds

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Groene LED

 

 

 

Ventilator begint te

 

 

 

 

 

 

 

 

 

 

 

Fan starts running, gas

 

 

 

 

 

 

 

 

Green LED on

 

 

 

draaien, gasklep

 

 

 

 

 

 

 

 

aan

 

 

 

 

valve open

 

 

 

 

 

 

 

 

 

 

 

 

 

 

open

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Warmtevraag

 

 

Rode

aan

 

 

 

 

 

 

 

 

Heat demand detected

 

 

Red LED on

 

 

 

 

 

 

 

 

gedetecteerd

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

YellowLED on

 

 

 

Burner ignites

 

 

 

 

 

 

 

 

Gele

aan

 

 

 

Brand

onts ekt

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ventilator

p elt

 

 

TheToesteldeviceblijftwillinremainbedrijf in

 

 

 

 

 

 

 

 

Fan pre-purges for about

 

 

operationtot warmtevraaguntil the heat

 

 

 

 

 

 

 

 

ongeveer 6 seconden

 

 

 

 

 

 

 

 

 

 

6 seconds

 

 

demandei igtends

 

 

 

 

 

 

 

 

voor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

As soon as there is a heat demand, the fan pre-purges for 6 seconds in order to remove any combustion gases still present. Then the fan stops and heats the hot surface igniter for 35 seconds. After this pre-heating period, the fan starts and the gas valve opens. This blows the air/gas mixture over the heated hot surface igniter and ignites the burner. The hot surface igniter switches off and subsequently works as a flame probe for measuring if the ignition has taken place. If the hot surface igniter detects loss of the flame, it will shut off the gas supply to the burner.

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

39

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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 contentAbout the device What to do when you smell gas RegulationsIntroduction 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 deviceSecurity of the device Introduction Operation of the deviceHeating cycle Air pressure switch Security of the water temperatureGas control 4 Fan3 T&P valve Unvented installationVented installation 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 vented InstallationsDrain unvented Start up Opening the gas valve 3.5 Connections diagramStart up Introduction You can Shut downFor a short time Electrically isolateShut down Errors visible on the control ErrorsIntroduction Distinction is made between General errors Explosive ignition Symptom Cause Solution Remark Gas smellWater leakage 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

TWI 35-130, TWI 45-190 specifications

A.O. Smith TWI 35-130 and TWI 45-190 are high-efficiency water heaters designed to meet the diverse needs of residential and commercial applications. These units are part of A.O. Smith’s extensive product line, known for reliability, durability, and energy efficiency.

The TWI 35-130 model is a 35-gallon tank water heater, offering a first-hour delivery of 130 gallons. This capacity makes it suitable for households with moderate hot water demands. It features a compact design, allowing for easy installation in tighter spaces, which is ideal for urban settings. The unit operates on natural gas, promoting energy efficiency while reducing operational costs.

One of its main attributes is the advanced insulation technology that minimizes heat loss, thus enhancing overall energy efficiency. The TWI 35-130 is equipped with a state-of-the-art burner system that optimizes combustion for higher efficiency, translating to lower energy bills. Furthermore, it utilizes a dip tube that helps in delivering hot water promptly, ensuring that the demand for hot water is met swiftly.

On the other hand, the TWI 45-190 model caters to larger households or commercial settings with a 45-gallon capacity and a first-hour delivery of 190 gallons. This model also uses natural gas, but with a higher BTU rating, allowing for faster recovery rates, which is crucial during peak usage times.

Both models are designed with user-friendliness in mind, featuring intuitive controls that facilitate easy temperature adjustments and monitoring. Additionally, they incorporate safety features such as a temperature and pressure relief valve to prevent overheating and excessive pressure build-up, ensuring peace of mind for users.

Their innovative design also emphasizes longevity, with high-grade materials and protective coatings that resist corrosion and extend the lifespan of the tank. The TWI series stands out in the market not only for its performance and efficiency but also for its commitment to sustainability.

In summary, A.O. Smith's TWI 35-130 and TWI 45-190 water heaters bring together cutting-edge technology, efficiency, and reliability, making them excellent choices for both residential and commercial applications. With features designed to promote energy savings and user convenience, these models are poised to meet the hot water demands of modern life while adhering to high standards of safety and durability.
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