170/238
Building Technologies
Modular Heating Controller RMH760B
CE1P3133en
HVAC Products
10 DHW heating
05.02.2007
The effective setpoint appears on the
Main menu
and on the info page.
Main menu > DHW > Inputs/setpoints
Operating line
Adjustable values / display / remarks
Storage tank temp setpoint
0…140 °C
Flow temp sec setpoint
0…140 °C
Primary flow temp setpoint
0…140 °C
10.7.2 Load
control
DHW charging can be influenced by load control signals from a heat source or primary
controller.
Load reduction can be triggered by one of the following functions:
•
Protective boiler startup
•
Minimum limitation of the boiler return temperature
Main menu > Settings > DHW > Controller primary circuit
Operating line
Range
Factory setting
Locking signal gain
0…200 %
100 %
From the consumer’s point of view, a load increase can be effected in the form of pump
and / or mixing valve overrun. This will force the consumer to continue to draw heat.
Overrun is not possible with direct DHW heating since there is no pump on the secon-
dary side. Overrun does not act on the circulating pump.
By setting the DHW priority, a load reduction on the heating circuits can be enforced.
When the priority is active, there is thus more heat available for DHW heating, and the
charging time becomes shorter.
For more detailed information, refer to section 10.10 “DHW priority“.
10.8 Limitation and protective functions
10.8.1 DHW
discharging protection
The flow temperature is monitored to prevent the storage tank from being discharged.
Discharging protection can become active during storage tank charging or during
overrun and deactivate the charging pump or primary pump.
To ensure that the function will also be performed when the charging pump is deacti-
vated (with no flow past the sensor), the flow temperature of the primary controller or
that of the boiler is used.
If a primary controller is used without a pump, it is possible that there will be no flow
past the flow temperature sensor. For this reason, discharging protection can be deac-
tivated.
In the case of plants with heat exchanger, the primary flow temperature is used, if
available.
The flow temperature must be acquired either locally by the same controller or by some
other device which communicates via bus.
For detailed information, refer to chapter 14 “Communication”.
Display of setpoints
Load reduction
Settings
Load increase
Flow temperature
⇒
