Eng. Edition 1.0 2004, Nov.
13
Connection of temperature sensor
(Temperature sensor boiler temp.)
The enclosed sensor for the boiler temperature shall be placed in an insert. It can
be fixed directly to the pressure tank plate on the hot water section of the boiler
with 2-component epoxy glue, if there is no other way. It should be placed as far
away as possible from the hot water tank.
If water heater or shunt valve is fitted in the boiler, the burner must be controlled
by the boiler temperature and the temperature sensor shall be fitted on the boiler.
If water heater or shunt valve is fitted in an accumulator tank, the temperature
sensor can be fitted on the accumulator tank in order to get longer operation time
and less starts and stops. If the temperature sensor is placed on the accumulator
tank, there must be a loading circuit with capacity to cool down the boiler, so
that the boiler temperature does not exceed 95°C before the tank has reached the
temperature-setting (80°C is recommended) and the burner is shut down.
Do not place the temperature sensor too near the bottom of the tank as that will
make it more difficult for the loading circuit to cool down the boiler to a
sufficient level. In doubtful cases, fit the temperature sensor on the boiler and
make the following test: Heat the boiler and the tanks up to a boiler temperature
of 95°C and check the tank temperatures. This test will help to find out where to
place the sensor, and, if at all suitable, to place it on the accumulator tank.
If the boiler is connected to a tank with direct circulation, the boiler temperature,
to avoid corrosion in the boiler, may not fall below 60°C before the burner
starts.