FAQ | 5
B1820023_en | Service handbook Lambdatronic H 3200 - T4e 99
5.4 Determination of the quantity of heat
5.4.1 Assembly Information
The contact sensor and the line regulating valve must be positioned in the direction of
flow downstream of the circulating pump and immediately upstream of the return
connection of the boiler. Additional contact sensors and line regulating valves are
required for boilers without return temperature control or return temperature control with
thermal valve. A return feed sensor is already fitted on the return temperature control with
3-way mixing valve, which means that only the line regulating valve is required
additionally.
The return temperature control comes fitted with a 3-way mixing valve. The relevant
return feed sensor is already wired. The position in the boiler is specified for the
installation of the line regulating valve. Please refer to the information in the installation
instructions for the boiler.
Return temperature control with mixing valve (factory fitted)
Boiler
Return feed sensor
Line regulating valve
Circulating pump
speed-controlled
3-way mixing
valve
Components integrated in boiler!
5.4.2 Functioning and configuration
Software version V50.04 – B05.19 at minimum is required for the heat quantity
calculation to work. The difference between the boiler temperature and the boiler return
temperature as well as the flow of the circulating pump are used to calculate the heat
quantity.
Calculating the feed output of the circulating pump
Boiler with 3-way mixing valve
r Set mixing valve to manual operation and turn the lever to the central position
r Activate the circulating pump in manual operation with 100% speed
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