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3.6. Weekly clock
The program selectable by the user enables to reduce/increase air exchange during selected periods of time. 5 different
time periods can be programmed at the same time. Each time period can be set with one or several weekdays.
3.7. Office mode
The installer can select the office mode from the maintenance menu - this is useful in case the air exchange system is
installed into an office where activities take place mostly during daytime.
The mode is equipped with continuation switch that enables persons who remain in the office for longer to prolong the
functioning of the appliance by set interval. Intensification and out-of-house mode functions are not usable in the office
mode.
Remote control mode can also be selected from the maintenance menu that enables to switch the unit on and off by the
mean of pre-programmed data and weekly clock functions are deactivated.
4. Setting the temperature
Temperature is measured from four different sources: temperature outside, inlet temperature, outlet temperature and
exhaust air temperature. The temperatures are displayed on the operating panel. The precision of measurement is +/- 1
degree.
4.1. Post-heating
The thermostat leads the post-heater located in the inlet channel. The heater can be electrical or water heater and is
selected by the installer from the maintenance menu. The heater keeps inlet air at the exact temperature selected by the
user. The desired temperature can be set from the operating panel. Set values are between 15 - 30 degrees.
4.2. Preheating
Preheater is an electric heater located in the outlet channel. The preheater´s thermostat is driven based on the
temperature of exhaust air. Preheating is meant for prevent freezing of the recovered heat. The temperature setting of the
thermostat can be selected by the installer from the maintenance menu with limitations of 0 - 10 degrees.
4.3. Summer cassette function
The unit is equipped with summer cassette for heat exchange during summertime. The user can select the function
manually or let the functioning be determined automatically according to the temperature outside. During the Summer
mode, the bypass plate of the cassette is activated.
The automatic functioning can be set with external temperature between 15 - 20 degrees.
5. Alarms and reminders
5.1. Activation of overheat protection
Information on activation of overheats protection connected to electrical post-heater and preheater is received from the
heater. In case the protection launches, the impellers are automatically set on minimum speed, red indicator light blinks
on the operating panel and the display informs about malfunctioning.
5.2. Inlet air too cold
Inlet air minimum temperature must be set from the maintenance menu. When the air temperature is lower than set, the
information will be displayed on operating panel and red indication light is turned on. The inlet impeller is stopped and the
speed of outlet impeller is reduced to minimum. These actions prevent the water-circulation battery from freezing.
5.3. Income air too hot
Maximum limit of income air temperature must be set from the maintenance menu. When the air temperature exceeds the
set limits, respective information will be displayed on operating panel and red indication light is turned on. The inlet
impeller is stopped and the speed of outlet impeller decreased to minimum.
5.4. Exhaust air too cold
The exhaust air temperature minimum limits must be set from the maintenance menu (0-10 degrees). When the air
temperature is lower, warning is displayed on the operating panel and red indication light is turned on. The temperature is
attempted to keep above the set value by reducing the speed of inlet air impeller (see also preheating) by regulating it
one-step at a time. In case the air temperature does not rise over the alarm limit even when the impeller is completely
stopped, the red indication light starts to blink and freezing alert is displayed. In case the temperature is restored to
normal, normal functioning will be also restored by increasing the impeller speed one-step at a time.
5.5 Danger of freezing the water battery
The lower temperature limit for the return water can be set by adjusting value of the "RADIATOR RETURN MIN TEMP"
setting in the service menu of the VKL-units. If the return water temperature slides below the limit, a textual alert and red
.
indication light are displayed on the operator panel
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