A.O. Smith EQB 115 G, EQB 200 G, EQB 155 G manual Technical safety equipment, Gas control valve

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1.2Technical safety equipment

1.2.1 Gas control valve

The water heater has been fitted with a gas control block consisting of a thermo-electrical pilot flame safeguard, pilot flame pressure regulator, burner pressure regulator, a control thermostat (adjustable between 40°C and 80°C) and a safety thermostat (90°C). This gas control block with its simple and secure control respectively switches the gas supply to the main burner on or off.

This gas control block is suitable for gasses from the first, second and third gas family. The maximum inlet pressure is 50 mbar.

1.2.2 Flue down draught safety device

The appliance is fitted with a flue down draught safety device. The operation of the safeguard is based on the principle of the Thermal Reflux Safeguard (T.R.S.).

The appliance has been fitted with a T.R.S., see Figure 2.

This T.R.S. can be recognized by the brass colored helix coil which is connected to the lower edge of the draught diverter. The helix coil has been connected to the thermostat by means of a capillary tube. The wiring of the thermostat has to be connected to the couple circuit before the heater is put into operation.

It is the aim of the T.R.S. to prevent flue gasses from the water heater entering the room where the water heater has been placed, instead of passing through the flue to outside atmosphere. The thermo-couple circuit is interrupted and the gas supply is disconnected as soon as the T.R.S. is activated by heating of the sensor by the hot gasses.

After the cause of the reentry of flue gasses has been traced the device can be put back into operation again. In case

of T.R.S. the RESET button has to be pressed first.

If this failure occurs frequently, this indicates that the flue suffers from down draught conditions. We advice that necessary remedial actions be carried out by a competent person.

Important

The T.R.S. should never be put out of operation. Reentry of flue gasses to the building could be harmful and cause poisoning or death.

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Contents EQB 115 G EQB 155 GEQB 200 G Page Contents Description ApplianceAOS Technical safety equipment Flue down draught safety deviceGas control valve AOS Dimensions Technical descriptionDimensions Technical data Device category II2H3+Installation instructions InstallationWater connections AOS Gas connection Flue systemCommissioning Filling the water heaterPutting into operation Pilot adjustment Putting out of operationRemoving and replacing the inner door Temperature regulation Setting the pilotSetting the nominal heat input Converting to another type of gasDescription Unit EQB G20 G30 G31 Maintenance Sacrificial anodeInspection of the internal waterside surfaces CleaningInlet combination Spare partsCondensation Fault findingGas smell Important warningCommissioning 3 UsePutting out of operation Maintenance Fault finding Fault Possible causeFault Possible cause Conditions for installation and use Guarantee in generalGuarantee of the tank Range of guaranteeAny other dealer or stockist of the warrantors products Page Page Page Page 0307 630 R1

EQB 115 G, EQB 155 G, EQB 200 G specifications

A.O. Smith has established a strong reputation in the water heating industry, and their EQB series of gas water heaters exemplifies this commitment to innovation and efficiency. The EQB 200 G, EQB 155 G, and EQB 115 G models are crafted to meet various residential needs while showcasing advanced technologies and user-friendly features.

The EQB 200 G is the powerhouse of the series, designed to accommodate households with higher hot water demands. It boasts a 199,000 BTU per hour input, enabling quick heating and sustaining higher output even during peak usage times. The unit features a robust tank capacity, ensuring an ample supply of hot water when needed. A.O. Smith's unique combustion system enhances the efficiency of this model, optimizing fuel consumption and reducing operational costs.

Next, the EQB 155 G offers a perfect balance for medium-sized households. With a maximum input of 155,000 BTU per hour, this water heater is capable of delivering consistent hot water without compromising on energy efficiency. The smart design includes a built-in temperature control that allows for precise adjustments, making it convenient to set the desired water temperature. Its compact design enables easier installation in smaller spaces, while still providing quality performance.

For smaller households or those with lower hot water requirements, the EQB 115 G is an ideal choice. This model operates at a maximum of 115,000 BTU per hour, making it perfect for apartments or modest-sized homes. The EQB 115 G features innovative insulation technology, significantly reducing heat loss and enhancing overall efficiency. This not only conserves energy but also contributes to lower utility bills over time.

All models in the EQB series are equipped with A.O. Smith's exclusive Cyclone 2 venting system, designed to facilitate efficient airflow and reduce the risk of backdrafts. Additionally, the advanced ignition system promotes reliable performance while minimizing maintenance needs.

A key standout feature across this series is the integrated smart technology, which provides real-time monitoring of water temperature and energy consumption. This connectivity allows homeowners to track their water usage and make adjustments to optimize performance further.

In summary, the A.O. Smith EQB series - including the EQB 200 G, EQB 155 G, and EQB 115 G - showcases superior technology, user-centric design, and energy-efficient operation. These gas water heaters are engineered to cater to a variety of household needs without sacrificing performance or convenience.
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