ARI Armaturen TEMPTROL 774 EN - Manual (Page 9)

Rev. 0040702000 1011 Page 27
Operating and installation instructions
TEMPTROL
®
5.2.1 Thermo controller with 2 temperature sensors
- The first temperature controller (pos. 50.1a) (a bar sensor for liquids or a spiral sensor for
air) measures the external temperature (regulating variable).
- The second temperature controller (pos. 50.1b) (a bar sensor) measures the external
temperature (command variable). It should be mounted outside wall - north side away
form the sun, 2m above ground and protected from wind.
- The influence of the external temperature on the controlled temperature is possible due to
the difference in volume between the first sensor (regulating variable) and the second
sensor (command variable).
- The set point indicator has a trend scale with a middle mark (refer to setting diagrams in
the data sheet).
5.2.2 Selection of temperature sensor- Location
- The temperature sensor (pos. 50.1) must be completely immersed.
Care should be taken to assure adequate circulation.
- At low flow rates, we recommend installing the temperature sensor (pos. 50.1) horizontally
(for example in boilers at 2/3 height).
- The control thermometer should be installed near the location from temperature sensor.
- In pipelines, a threaded coupler must be welded into the pipe and the temperature sensor
mounted against the flow direction.
- When installing the temperature sensor (pos. 50.1) directly, be sure the connection is free
of leaks (gasket is included).
- Room temperature sensors should not be exposed to interference such as drafts, sunlight
and other sources of heat.