15
THERM 90 KD.A
The calculated temperature of the heating water is
restricted to max. 80 °C. If the calculated temperature
varies within the range 20 ÷ 35 °C the requested
temperature is restricted to the minimum temperature
of the boiler, i.e. 30 °C and the function of periodical
running of the boiler is activated within the fixed interval
of 15 minutes and the variable time of running for 35 °C
according to the formula:
Note:
T
on
= interval of activation of the boiler
T
off
= remaining interval for the disconnection
of the boiler into fixed 15 minutes
T
on
(min) = 15 – T
off
; which T
off
(min)
= 35 – calculated equitherm temperature
If the calculated equitherm temperature
≤ 20 °C, the boiler remains disconnected.
Example of the course of selected curves
during correction of the shift
(middle
button):
It results from the mentioned facts that using the knob to set the temperature of the heating on the control panel, in this
regime, the requested temperature of the heating space is indirectly set. At the beginning (in the production) the equithermal
curve is set for „K“ = 1,6. The initial user setting of the rotary control knob is in the middle of the setting route (the indicator is up
which corresponds to the shift of the curve 0 °C). After inspection of the temperature of the heated space (after approximately
24 hours), it is possible to perform additional setting according to all requirements for thermal comfort. Due to the influence
of the equithermal regulation the change of ambient temperatures will be compensated and the level of temperature of the
heated space will be automatically kept at a constant level.
Using this regime of regulation, a further decrease of operating costs can be achieved while improving thermal comfort
(continuous heating of heating bodies). Finally,
this option can be appreciated as pre-regulation
of the primary heating circuit when using zone
regulation (by mixing valves), etc.
Graph of the course of equithermal
curves
(zero shift)
!
During the activated equithermal regulation the meaning of the function of the middle button on the control
panel of the boiler is changed. In this case, the mentioned knob is used to set the shift of the heating curve
(within the range ±15 °C from the equithermal curve set by the service technician).
K=0,5
K=1,0
K=1,5
K=2,0
K=3,0
K=4,0
K=6,0
20.00
30.00
40.00
50.00
60.00
70.00
80.00
-25
-20
-15
-10
-5
0
5
10
15
20
Outdoor temperature (°C)
Heating water temperature
(°
C)
K=1,0
K=3,0
+15°C
-15°C
+15°C
-15°C
20.00
30.00
40.00
50.00
60.00
70.00
80.00
-25
-20
-15
-10
-5
0
5
10
15
20
Outdoor temperature (°C)
Heating water temperature
(°
C)
