User Manual

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Siemens Building Technologies Room temperature controller CE1N3025en
HVAC Products 12.06.2003
Engineering notes
In systems with automatic changeover, the temperature sensor can be replaced by an
external switch for manual changeover.
In systems with continuous heating operation, no sensor will be connected to the
controller’s input.
With continuous cooling operation, the controller input (B2–M) must be bridged.
Mounting location: on a wall or inside the fan coil unit. Not in niches or bookshelves,
not behind curtains, above or near heat sources and not exposed to direct solar radia-
tion. Mounting height is about 1.5 m above the floor. The connecting wires can be run
to the controller from a recessed conduit box.
Check the settings of the DIP switches no. 1 and no. 2 and change them, if required.
If setpoint limitation is required, use the minimum and maximum limitation facility (en-
ergy saver). After applying power, the controller makes a reset during which the fan
LED flashes, indicating that the reset has been correctly made. This takes about 3
seconds. Then, the controller will be ready to operate.
• Prior to fitting the changeover sensor, thermal conductive paste must be applied to
the location on the pipe where the sensor is placed
• The cables used must satisfy the insulation requirements with regard to mains
potential
• Sensor input B2-M carries mains potential. If the sensor’s cable must be extended,
the cables used must be suited for mains voltage
The controller is supplied with Mounting Instructions.
Mounting, installation
and commissioning