Potterton eurocondense four 125 kw Installation, Operation And Maintanance Manual page 90

9 Settings
Tab.9 Duration of the quick reduction
Duration of the quick reduction for reduction by 2°C in hrs:
Outside temperature mixed:
15°C
10°C
5°C
0°C
-5°C
-10°C
-15°C
-20°C
Duration of the quick reduction for reduction by 4°C in hrs:
Outside temperature mixed:
15°C
10°C
5°C
0°C
-5°C
-10°C
-15°C
-20°C
Fig.33 Optimum start and stop control
90
enabled. Without room sensor the quick reduction switches the heater off
depending on the outside temperature and the building time constant
(prog.no. 6110) until the temperature has theoretically dropped to the re­
duced target value or the frost protection value.
Building time constant (configuration, prog.no. 6110)
0 hrs 2 hrs
0 3.1
0 1.3
0 0.9
0 0.6
0 0.5
0 0.4
0 0.4
0 0.3
Building time constant (configuration, prog.no. 6110)
0 hrs 2 hrs
0 9.7
0 3.1
0 1.9
0 1.3
0 1
0 0.9
0 0.7
0 0.6
Optimum start control max (790, 1090, 1390) and Optimum
stop control max (791, 1091, 1391)
Xon Start time set forward
Xoff Stop time set forward
ZSP Time switching program
TRw Room temperature setpoint
TRx Room temperature actual value
The optimisation of the on/off switching times is a function of time and pos­
sible with or without room unit. With a room unit the changeover of operat­
ing level compared to the programmed time moves forward so that the
building dynamics (heat-up and cool-down times) are taken into account.
In this way the required temperature level is reached exactly at the pro­
grammed time. If this is not the case (too early or too late) a new switching
RA-0000070 time is calculated that is applied next time.
Without room sensor an advance time is calculated based on the outside
temperature and the building time constant (prog. no. 6110). The optimisa­
tion time (advance) is limited here to a maximum value. By setting the opti­
misation time = 0, the function is switched off.
Reduced setp increase start (800, 1090, 1390) and Reduced
setp increase end (801, 1101, 1401)
5 hrs 10 hrs 15 hrs
7.7 15.3
3.3 6.7
2.1 4.3
1.6 3.2
1.3 2.5
1 2.1
0.9 1.8
0.8 1.5
5 hrs 10 hrs 15 hrs
24.1
7.7 15.3
4.7 9.3
3.3 6.7
2.6 5.2
2.1 4.3
1.8 3.6
1.6 3.2
20 hrs 50 hrs
23
10 13.4
6.4 8.6 21.5
4.7 6.3 15.8
3.8 5 12.5
3.1 4.1 10.3
2.6 3.5 8.8
2.3 3.1 7.7
20 hrs 50 hrs
23
14 18.6
10 13.4
7.8 10.5 26,2
6.4 8.6 21.5
5.5 7.3 18.2
4.7 6.3 15.8
7636047 - 02 - 24082015