│
48
5.1.17. Thermal inertia of a building
Thermal inertia of a building indicates how fast the calculated desired heating water temperature
(following the heating curve) is influenced by a change in outdoor temperature. The heavier
the building design, the more slowly can be the heating water temperature modified through
the outdoor temperature. The value of thermal inertia indicates the delay with which the given
outside temperature change is reflected in the calculation.
0 = No correction applied, all changes are immediate
1 = 1 = 15 minutes delay, 2 = 60 minutes, 3 = 120 minutes, 4 = 300 minutes
5.1.18. Overload protection (thermal store cooling)
If this function is activated and the temperature at the thermal store sensor exceeds “Max.
buffer” (an adjustable threshold, displayed after the function is turned on), the heating circuit
pump will start at max. speed, disregarded of the actual mode of the heating circuit. While in
the active protection mode, the controller will mix heating water to the max. HC temperature
(5.1.10.). As soon as the temperature in the thermal store drops below “Max. buffer” minus
5 °C, the heating circuit will return to its original mode.
5.1.19. Room Controller
This value is used to appoint the amount of influence the room temperature has on the reference
flow temperature, as a percentage. For every degree the room temperature deviates from the
reference room temperature, the percentage of the calculated reference flow temperature set
here is added to or subtracted from the reference flow temperature. So the flow temperature is
being adjusted following the real indoor temperature which reduces inefficient overheating of
a building (or underheating e.g. in case of intensive ventilation). Flow temperature correction
is possible only within the limits of the Min. (5.1.9.) and Max. (5.1.10.) flow temperature.
Example:
The desired room temperature: 25 °C, current measured temperature: 20 °C (the difference is 5 °C);
the outdoor temperature is 0 °C
The calculated flow temperature following the heating curve is 40 °C. The room unit is set to 10%,
10% of the calculated temperature 40 °C makes 4 °C. The difference between the desired and current
room temperature is multiplied by this value, i.e. 4x5 °C = 20 °C.
The required flow temperature shall be then increased by 20 °C, from 40 to 60 °C. If the Max. Flow
parameter (5.1.10.) is set to 50 °C, the required flow temperature will be increased only to this value.
Room Reference (Day)
The desired room temperature for day mode.
Room Reference (Night)
The desired room temperature for night mode.
In the modes Ref, val. and 14 day ref. val. (menu 5.1.1.) the room unit has no
influence.
Sensor type
The room controller is set here:
RC20
= the room unit has a direct influence on the flow temperature depending on the
difference between the desired and real room temperature (please select if you use RC20,
RC21 or Caleon room unit).
Contact
= room thermostat with potential-free contact, contact open = Heating Circuit
function turned off; contact closed = Heating Circuit function turned on.
Season
= a seasonal switch connected (for the selected mode
heating/cooling
), contact
open = cooling mode; contact closed = heating mode
Thermostat
Input terminal where a thermostat, seasonal input or a room unit’s switch-over input is
connected.
If you use Caleon room unit, here you should select the unit with the appropriate ID (ID for
Caleon units can be found in menu 7.15. Network).
