Hot Water Circuit; Hot Water Operating Mode; Setting The Set Point For The Hot Water Circuit - Siemens IQHeat User Manual

8 Hot water circuit

NOTE: All settings done in this chapter require login at end-user level.
8.1

Hot water operating mode

The hot water circuit can be set in one of four operating modes:
•
Auto - plant uses the set Set point and can be controlled via an external communication interface. To
activate the legionella function, you must select the Auto mode.
•
PlanProt (Protective operation) - water is only heated if there is a risk that the water pipes might freeze
•
Reduced - plant uses a reduced Set point. Reduced Set point can only be set if the hot water circuit
has timing control.
•
Normal - plant uses the set Set point.
8.2

Setting the set point for the hot water circuit

All countries have different rules for how hot or cold tap water should be.
Cetetherm recommends the hot water temperature is at least 55°C and a hot water circulation not less than
50°C.
At a temperature below 50°C there is a risk of bacterial growth.
Note that at temperatures above 60°C the risk of scalding increases.
Set points above 63°C result in an increased risk of precipitation of lime on the surfaces of the heat exchanger.
1. From the Main Index, select Domest.hot water and
press OK.
2. Select Operating mode and press OK.
3. Select preferred operating mode and press OK.
•
Auto
•
PlantProt
•
Reduced
•
Normal; recommended
1. From the Main Index, select Domest.hot water and
press OK.
2. Select Set point temp. normal and press OK.
3. Set the desired value using the navigation dial,
press OK.
Parameter: Settings range
45...80°C
Set point
temp normal
23
IQHeat
User manual
Relates to
The set point is
used in Normal
and Auto
operating
modes