2.5.2 Descaling

Calcium precipitation depends on the water properties and the hot water demand. In addition, calcium precipitation in the tanks increases at high water temperatures. A clean out opening is located at the front for inspecting and descaling the tank. The clean out opening can be reached via the cover plate on the outer jacket of the tank. Empty the tank before opening the clean out opening. Descaling must be carried out with suitable descaling agents, which can be ordered form A.O. Smith distributors.

To ensure that the clean out cover is watertight, the flange gasket should be replaced after every inspection.

2.6 Spare parts

It is important to mention the tank type, model and full serial number when ordering spare parts. The spare parts can be determined on the basis of these numbers.

3. FOR THE END USER.

Warning

An accredited installer must install the tank and perform start up of the system.

3.1 Filling the tank

1.Check if drain valve is closed (if mounted).

2.Open the cold-water tap to the heater and all hot-water outlets in order to bleed all air from the system. The heater is filled when cold water runs out of all outlets.

3.Close all taps at the hot-water outlet points. The tank is now under (water mains) pressure. At this pressure the pressure relief valve must not release any water.

3.2 Start up of the system.

1.Check if the heater is filled with water and that the primary system is ready.

2.Set the controls on the primary circuit t of the boiler to the required sanitary water temperature.

3.Open boiler supply and return valves (if installed)

3.3Shutting down For longer periods

1. Close the cold-water tap.

2. If there is any risk of frost damage, drain the tank completely.

3.4Maintenance

The pressure relieve valve must be tested regularly by opening test lever for some seconds. The water must run out in a full jet. Close lever again, making sure it sets properly and the valve is not leaking. Check if the drainpipe is open. It is recommended to arrange for a maintenance contract with the installer.

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A.O. Smith ST 1500, ST 3000 installation instructions Descaling, Spare parts, Start up of the system
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ST 1500, ST 3000 specifications

A.O. Smith is a leading brand in the water heating industry, known for its innovative technologies and reliable products. Among its diverse range, the A.O. Smith ST 1500 and ST 3000 tankless water heaters stand out as exceptional options for both residential and commercial applications.

The A.O. Smith ST 1500 model is designed for those who require efficient hot water on demand without the need for a bulky storage tank. It leverages advanced technology to ensure that hot water is readily available whenever needed, providing a continuous supply that can cater to multiple outlets simultaneously. With a heating capacity of 150,000 BTU, the ST 1500 is capable of delivering hot water for various applications, making it ideal for medium-sized households.

A key feature of the ST 1500 is its compact design. The unit can be installed in tight spaces, such as closets or utility rooms, making it a versatile choice for various homes. Additionally, it is equipped with high-efficiency burners that promote energy savings, reducing both operational costs and environmental impact. The integrated digital display allows users to monitor the water temperature and adjust settings for optimal performance.

On the other hand, the A.O. Smith ST 3000 offers greater heating capacity, boasting 300,000 BTU to cater to larger homes or commercial settings. This model excels in demanding situations, providing an efficient solution for high hot water usage. Its enhanced flow rate ensures that users can enjoy hot water for multiple simultaneous tasks without any interruptions.

Both the ST 1500 and ST 3000 models utilize advanced safety features, including overheat protection and a robust burner management system. These technologies not only enhance operational efficiency but also ensure user safety. Installation is straightforward, with options for both indoor and outdoor setups.

Another notable characteristic of these tankless water heaters is their user-friendly operation. They feature easy-to-navigate controls and settings that allow users to customize their hot water experience according to their needs. Moreover, both models are designed for easy maintenance, enabling users to keep their systems running smoothly with minimal effort.

In conclusion, A.O. Smith's ST 1500 and ST 3000 tankless water heaters exemplify reliability, efficiency, and advanced technology. Their ability to provide hot water on demand while maximizing energy savings makes them excellent choices for anyone looking to upgrade their water heating systems. Whether for residential or commercial use, A.O. Smith continues to deliver products that meet the highest standards of quality and performance.
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