A.O. Smith 290 1.3Operating menu E0: Factory default, Factory setting: E2: T9 set temperature

1.3Operating menu

E0: Factory default

If the system does not function as expected, even though the set points have been adjusted, and the cause is impossible to locate, it is

recommended to note down the settings in the schedule. Thereafter the set point must be adjusted to 1 and wait until the control returns to standard settings. Now all the set points have been changed to the factory default. It is now possible to start all over and adjust the set points.

Factory setting: 0

E2: T9 set temperature

This sensor is able to control the relay R9, which will be activated when the set- point E2 is reached. The R9 relay can be used to control the three way damper of the exhaust air. This three way damper can supply the living area with cool air, if the room temperature reach the setpoint E2. For this function you will need a separate sensor, which is not a within the standard delivering. The sensor shall be connected to the control panel. For access to the control panel you have to dismantle the top of the machine.

E2 can be set between 10-30°C

Factory setting: 21°C

E8: Disinfection function ON/OFF

By setting the point to 1, the electric cartridge will provide 65°C hot water, once a week, in order to disinfect the tank (legionella protection function).

Factory setting: 0

E9: Operating in cold surroundings ON/OFF

If the setting is 0, the heat pump will run as long as there is a need of heat (= exhaust air-operation).

Using the heat pump when taking the admission air from e.g. the cellar, there is an option of making the compressor stop in case the room is getting to cold. Instead, the electric heater will heat the water. The function is activated when the value has been set to 1 (= circulating air-operation).

It is also possible to automatically let the electrical heater help heating the water when the intake air temperature is below the temperature set in E10. The function is activated when the value has been set to 2 (= fresh air operation). If the value is 0, the function is not active.

Factory setting: 0

E10: Operating in cold surroundings

When activating the function menu E9, the temperature at which the compres- sor will stop, or the heater will assist, may be set. The temperature is adjustable between –10 and +10°C.

Factory setting: -5

E15: Hygrostat / stop unit

If the value is 0, the speed of the fans will change to 3 when the relative humidity is above the preset value of the hygrostat. If the value is 1, the unit will stop when the clips 25 and 26 are short-circuiting.

Factory setting: 0

E16: Min. airflow

This value shows the minimum speed at which the fan is permitted to run when operating. Notice that the cooling system may be overloaded,

resulting a drop out of the high-pressure switch, if the value has been set too high. The value should not be chosen higher than necessary, in order to secure a minimal airflow through the cooling coil. Adjust this value between 0-100%. Factory setting: 0

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