Fig. 9. Macro Icon with Inputs and Outputs
Table 19. Inputs
Inputs |
Description |
Connection Signal Name |
SecSupTemp |
secondary flow temperature |
|
DHW_TempSp |
domestic hot water setpoint |
|
PriSupTemp |
primary supply temperature |
|
PriSupTempSp |
primary supply temperature setpoint set to 58 °C to avoid calcification |
|
PriRetTemp |
primary return temperature |
|
PriRetTempSp |
primary return temperature setpoint |
|
LegionellaEnable |
enables the legionella function |
XXX |
CircPumpDemand |
start DHW control and circulation pump |
|
MaxThermostat |
maximum temperature |
|
DayExtension |
extended operation |
|
HolidaySwitch |
holiday switch 0 = auto 1 = holiday |
|
SecMinPressSw |
secondary minimum pressure switch |
|
Reset |
reset alarms |
XXX |
Table 20. Outputs
Outputs |
Description |
Connection Signal Name |
PriPumpCmd |
primary pump command |
|
ValveControl |
DHW valve control output |
|
CircPumpCmd |
circulation pump command |
|
CalcDHWTempSp |
calculated domestic hot water setpoint |
|
CalcRWTempSp |
calculated return temperature setpoint |
|
CalcDemandOut |
calculated heat demand |
|
RefillValveCmd |
refill valve command |
|
LegionellaActive |
legionella function is active |
|
DHW_Failure |
DHW temperature failed alarm |
|
DHWS_Leg_Alm |
legionella protection failed alarm |
|
OperationMode |
contains diagnostic information |
Table 21. Operation modes
DISP-02 OperationMode |
Operation mode |
Comment |
1 |
unoccupied period |
DHW_TempSp < SYS-01 |
2 |
occupied period - normal operation |
DHW_TempSp >= SYS-01 |
3 |
primary supply temp limitation active (has the minimum signal) |
primary supply temperature limitation control has the minimum signal |
4 |
primary return temp limitation active (has the minimum signal) |
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 |
||
8 |
||
9 |
system supply temperature setpoint failed |
“SecSupTemp” < “CalcDHWTempSp” –SST-06 for more than 600 sec after control start. |
10 |
legionella protection function active |
input “LegionellaActive” is active increases the return temperature setpoint |
11 |
legionella protection function failed |
secondary supply or circulation temperature sensors didn't reach the anti-legionella setpoint, within the time to reach legionella setpoint LEG-02 |
12 |
maximum temperature limitation by max. thermostat |
alarm at the input “MaxThermostat” |
13 |
||
14 |
maximum refill time exceeded |
refill failed after a minimum pressure alarm (6) |