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17.2
WATER HEATER OPTIONS
17.2.1
0-10 VDC REMOTE FLOW TEMPERATURE SET POINT
The hot water temperature is controlled by connecting an external 0-10 VDC signal to the water heater (connections 15-16).
P5 BB
Analogue input Config (0=off 1=temp 2=power) (display D1).
This parameter must be set at "1" so the supplied 0-10 V dc signal will control the temperature set point.
Possible settings are:
0 =
0-10V control off
1 =
0-10V temperature set point control active
See also the following graph for the relation between temperature and control signal.
Curve and values only for illustration purposes, programmed parameter values can deviate
17.2.2
ANTI-LEGIONNAIRES' DISEASE (PASTEURISATION) FUNCTION
To help prevent Legionnaires' disease the water heater (software) provides a function for heating up the hot water storage tank (once a week
or every day) to a higher water temperature than the normal active hot water set point. Also the time period, that this "higher" water
temperature function must be active, can be programmed in P7BV start time (0:00) and P7BW (8) and is standard switched off.
Also an external 0-10 Vdc signal can be used to activate the pasteurisation function. This can be done by making the 0-10 V signal higher than
10.2 V.
The standard factory setting for this (pasteurisation) function is "OFF". To activate this Legionnaires' disease function
some parameters must be programmed by the manufacturer/supplier. The starting day and time of this Legionnaires'
disease function can be programmed at the control panel of the water heater.
Several parameters are used for this function. Three of these parameters are shown in the following graph.
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