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Building Technologies
Modular Heating Controller RMH760B
CE1P3133en
HVAC Products
8 Main controller and primary controller
05.02.2007
8.8.5
Pump overrun and mixing valve overrun
To protect the boiler against overtemperatures after the burner has shut down (when
there are no more active heat consumers), an overrun time for the consumers can be
set on the boiler controller.
After the burner has shut down, the overrun time ensures that the heating circuits and
DHW heating will draw heat for that period of time, provided they were consuming heat
up to one minute before the burner was shut down. In any case, pumps and mixing
valves have an overrun time of 60 seconds.
With primary controller type 1, the mixing valve maintains the former setpoint during the
overrun time and the pump continues to run; with primary controller type 2, the pump only
operates during the overrun time.
8.8.6
Pump kick and valve kick
The pump and valve kick is a protective function which can be periodically performed. It
prevents pumps and / or mixing valves from seizing after longer off periods.
For more detailed information, refer to section 5.5 “Pump kick and valve kick”.
8.9
Text designation
If required, specific text can be assigned to the main controller or the primary controller.
This text will then appear on the menu and on the info display.
Main menu > Commissioning > Settings > …
or
Main menu > Settings > Main controller
Operating line
Range
Factory setting
Main controller
Max. 20 characters
Main controller
Main menu > Commissioning > Settings > …
or
Main menu > Settings > Primary controller
Operating line
Range
Factory setting
Primary controller
Max. 20 characters
Primary control-
ler
8.10 Fault
handling
When commissioning is completed (Commissioning menu quit), the system checks
whether the required sensors have been connected. In the event of an open-circuit or
short-circuit, a fault status message will be delivered.
Number Text
Effect
54
Main contr flow sens error Nonurgent message; must be acknowl-
edged
57
Prim controller error flow
sensor
Nonurgent message; must be acknowl-
edged
In the case of an error of the flow temperature sensor, the mixing valve will be driven to
the fully closed position to become inactive (3-position actuator), enabling it to be
manually operated.
Number Text
Effect
58
Prim controller error ret
sensor
Nonurgent message; must be acknowl-
edged
Main controller
Primary controller
Faulty flow sensor
Faulty return sensor
