E17: Extended airflow ON

At 3rd speed, there is an option of making the unit step down automatically to the 2nd speed, after a number of hours, by adjusting to set 1. If the setpoint is adjusted to 0, the unit will run at the 3rd speed until a lower speed has been selected manually.

Factory setting: 0

E18: Hour

If automatic step-down at 3rd speed is in use, the number of hours at which the unit is to operate with forced air, may be adjusted here. The setpoint may be adjusted between 1 - 10 hours.

Factory setting: 3

E19: Extra function

If the setpoint is 1 the extra function will be activated as soon as T9 reach the setpoint (se E2). If the setpoint is 0, the function will be out of order.

E21: TX set

In order to avoid high operating pressures in the cooling system, the system out- put must be reduced for the remaining part of the heating period. This parameter indicates the water temperature at which the reduction should start. It may be set to 0-55°C.

Factory setting: 50

E23: Tmop

This value indicates the maximum permitted evaporation temperature. This pre- vents overloading of the compressor system at high ambient

temperatures.

Adjust this value between 0-25°C.

Factory setting: 25

E25: Vent level 2

If an extended period of extraction from the building is wanted, it is possible to change to level 2. The fan will now run until another level has been selected. This option is used to set the speed at which the fan should run, when level 2 is selected. Please note that this setting also sets the maximum fan speed when running in level 1. The speed may be set to 0-100%.

Factory setting: 100

E26: Vent level 3

If extraction from the building at a specific length of time is required, it is possible to change to level 3. The fan will now run for the set period. Thereafter the sys- tem will return to level 2. This menu option is used to specify the speed at which the fans should run when the set period has been chosen. Please note that this setting also sets the maximum fan speed when running in level 1 The speed may be set to 0-100%.

Factory setting: 100%

E27:

Available function. Must at all times be 1.

E45: dTair-set

Here it is possible to choose minimum cooling of the air, while heating the water. The control will adjust the speed of the fan to make sure the air will be cooled at the exact temperature chosen. In case the control needs to cool the air due to technical reasons, the value will be controlled by the automatic function. When requiring a higher fan speed, the value may be reduced. Remember though, the- fan will run faster, using more energy, if the values are set to low.

Factory setting: 1

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A.O. Smith 290 service manual
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290 specifications

The A.O. Smith 290 is a prominent water heater designed to elevate the standards of residential and commercial hot water solutions. This product exemplifies A.O. Smith's commitment to innovation, efficiency, and durability in the water heating industry.

One of the key features of the A.O. Smith 290 is its impressive energy efficiency. Equipped with advanced insulation technology, the unit minimizes heat loss, thus reducing energy consumption and lowering utility bills. This energy-efficient design makes it an environmentally friendly choice for users looking to cut down on their carbon footprint while enjoying reliable hot water.

The A.O. Smith 290 operates using either natural gas or propane, offering versatility depending on the user's preference or availability of resources. Its robust heating system allows for quick recovery rates, ensuring that households or businesses have an ample supply of hot water, even during peak usage times. This capability is particularly beneficial for larger families or establishments requiring significant amounts of heated water for various applications.

Durability is another distinguishing characteristic of the A.O. Smith 290. Built with high-quality materials, this water heater is subjected to extensive testing to ensure it can withstand the rigors of daily use. The unit features a corrosion-resistant tank that prolongs its lifespan and reduces the likelihood of leaks, providing peace of mind to users who demand reliability from their appliances.

Furthermore, the A.O. Smith 290 integrates cutting-edge technology for enhanced usability. It comes equipped with a user-friendly digital thermostat that allows for precise temperature control, enabling users to set their desired water temperature while ensuring safety. In addition, safety features such as a pressure relief valve and thermal shutdown provide added protection for both users and the system itself.

The compact design of the A.O. Smith 290 allows for easy installation in various spaces, making it a versatile option for different settings. Whether installed in a crawl space, utility room, or closet, it efficiently delivers consistent hot water without taking up excessive space.

In conclusion, the A.O. Smith 290 stands out in the market for its energy efficiency, versatility, durability, and advanced technology. It represents a smart investment for anyone in need of reliable hot water, combining performance and efficiency while ensuring user safety and convenience. With its user-centric features, it is suited to meet the demands of modern living, making it a preferred choice among homeowners and businesses alike.
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