The operation mode provides useful information for easy testing and debugging of the heat exchanger. This information is available as a parameter DISP-03 or the macro output "OperationMode".
The output operation mode must be connected to a multi-stage datapoint with the states as shown in the next table. Since BACnet multi-stage points do not support the value "0", the operation mode value range starts from "1".
Table 12. Operation modes
Operation mode |
Comment |
|
1 |
heat exchanger has no demand |
there is no external heat demand |
2 |
secondary supply temperature control active |
normal operation |
3 |
primary supply temp limitation active |
primary supply temperature limitation control has the minimum signal |
4 |
primary return temp limitation active |
primary return temperature limitation control has the minimum signal |
5 |
periodic valve opening during limitation control |
Open the valve to avoid measuring standing water during limitation control, if the valve control signal = 0%. |
6 |
minimum pressure switch alarm |
alarm at the input “SecMinPressSw” |
7 |
outside air temp frost protection |
If the secondary supply temperature becomes less than the value of parameter SST-02 (switching differential 2 K) and the outside air temperature is less than the frost protection limit OAT-01 (switching differential 1 K), then the SST control will be released. In this case, the setpoint will be the value of the parameter SST-02. |
8 |
pump alarm |
secondary pump alarm at the input ”SecPmpStatAlm” |
9 |
system supply temperature setpoint failed |
“SecSupTemp” < “CalcSSTempSp” –SST-06 for more than 600 sec after control start. |
10 |
legionella protection function active |
input “LegionellaActive” is active and increases the return temperature setpoint |
11 |
||
12 |
maximum temperature limitation by max. thermostat |
alarm at the input “MaxThermostat” |
13 |
maximum temperature limitation by safety thermostat |
alarm at the input “SafetyTherm” |
14 |
maximum refill time exceeded |
refill failed after a minimum pressure alarm (6) |