Rotex Controller Series, Product Documentation

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EbV Product documentation THETA NORM/UNIT
8-39
Tank sensor 2: For complete loading of a hot-water tank by means of automatic measuring point
changeover between tank sensors 1 and 2 (layer loading). The measured value of
the hotter sensor (DHWS1 or DHWS2) is evaluated for the activation of the loading
pump. Termination of the loading is carried out on the basis of the measured value
of the colder sensor. The set values for the hot-water setpoint temperature and the
specified hot-water switching difference continue to apply.
8.3.2 Circulation pump (CIR.)
Note: This function is callable only if a variable output is defined for a circulation pump.
Function: The output controls a hot water circulation pump.
Impulse: Economy interval (pause)
The use of the economy interval minimizes the usual circulation losses owing to
adjustable switch-on intervals during operating and determines the run time of the
DHW circulation pump within an adjustable period (economy interval).
Period duration: Economy Interval (Period duration)
This parameter determines the length of the period and hence the duration of the
pause in a circulation pump pulse operating mode.
Econ. interval
no pulse
= Econ. interval
Period duration
- Econ. interval
Pulse
Example: In case of a pulse time of 5 minutes and a period of 20 minutes the circulation pump
runs for 5 minutes, while the final pause amounts to 15 minutes.
Switching Times: Switching times circulation pump
In this function a DHW circulation pump can be coupled to an existing automatic
program of a control circuit with regard to the switch-on and switch-off times. The
DHW circulation pump is in function during the heating or DHW cycles of the selected
circuit and program.
Note: If operation of the time programs P2 and P3 were not enabled (see parameter TIME
PROGRAM on parameter level SYSTEM) and the circulation pump is assigned to
one of these programs, the pump will operate according to the stored standard times.
The same applies if a switching-time program was selected that does not exist for the
controller in use (e.g. a MC 2 for THETA 23B).
Operation:
Note on operation Key / parameter tree Parameter
Activation tank sensor
HYDRAULIC PARAMETER 08
or
PARAMETER 09
or
PARAMETER 10
Operation:
Note on operation Key / parameter tree Parameter
Activation circulation pump
HYDRAULIC PARAMETER 02
or
PARAMETER 05
or
PARAMETER 06
or
PARAMETER 07
Assignment time program
DHW PARAMETER 12
Econ. interval running time
DHW PARAMETER 13
Econ. interval period duration
DHW PARAMETER 14