This is a special to release a redundant heat generator only at very big control deviations. In redundant systems one boiler is enough to deliver the heat power for the whole system throughout the year. The redundant boiler should be switched on for very big control deviations.
The redundant boiler will be released only if the control deviation gets higher than the setting OVR-01 high limit control deviation to enable the next boiler and the switch on delay overrides OVR-03 is elapsed.
The redundant boiler will be locked if the control deviation gets lower than the setting OVR-02 low limit control deviation to disable the next boiler and the switch off delay overrides OVR-04 is elapsed.
To disable this function set OVR-01 = 100 K.
Table 14. Parameter List
Description |
Value Range |
Default Value |
Unit |
OVR-01: high limit control deviation to enable the redundant boiler |
10 ... 100 |
30 |
K |
OVR-02: low limit control deviation to disable the redundant boiler |
0 ... 50 |
15 |
K |
OVR-03: switch on delay overrides |
0 ... 480 |
0 |
min |
OVR-04: switch off delay overrides |
0 ... 480 |
0 |
min |