User manual ALFA 11 +50/+150 C
Contents
1. User manual ALFA 11 50 150 C Cool Heat Thermostat ALFA 11 we VDH VDH doc 072375 Version v1 0 Date 16 10 2007 Software ALFA 11 50 150 File D0072375 WPD Range 50 150 C per 1 C Function The ALFA 11 is a digital thermostat for panel mounting The function from the thermostat can be programmed for cooling or heating Installation On the topside of the ALFA 11 is shown how the sensor power supply and relay have to be connected After connecting the ALFA 11 to the power supply a self test function is started As this test is finished the measured temperature appears in the display When the relay is activated the led on will light up in the display Control The ALFA 11 thermostat can be controlled by three push buttons on the front These keys are SET view change the set point UP increase the set point DOWN decrease the set point Viewing set point By pushing the SET key the set point appears in the display The led set starts blinking A few seconds after releasing the SET key the set point disappears and the measured temperature is shown in the display Changing set point Push the SET key and the set point appears in the display Release the at SET key Now push the SET key again and together with the UP or DOWN keys the set point can be changed A few seconds after releasing the keys the measured temperature shows again in the displa2. 2m 10000 at 25 C Sizes 90 x 53 x 58mm hwd Panel hole 46 x 53mm hw Provided with memory protection during power failure Connection with screw terminals on the back side Equipped with self test function and sensor failure detection Special version on request available Parameters ALFA 11 Switching differential 1 15 C Minimum setpoint 50 150 C Maximum setpoint 50 150 C Offset temperature sensor 15 15 C Startup delay after power failure Relays on at sensor failure Function cooling or heating Switch on delay relays 1 Switch off delay relays 1 Parameter 16 17 in sec or min Minimum on time relays Minimum off time relays 0 1 0 0 0 1 0 0 Network number Software version Production year Production week Serial number x1000 Serial number units Function HEAT or Function COOL Diff Diff Q 1SC 15 C Setpoint Setpoint 50 50 C 50 50 C Dimensions Address VDH Products BV Produktieweg 1 9301 ZS Roden The Netherlands Connections Supply Relay 1 230Vac Cool Heat ro df OOOO Tel Fax Email Internet brown 31 0 50 30 28 900 31 0 50 30 28 980 info vdhproducts n www vdhproducts nl
3. y Setting internal parameters Next to the adjustment of the set point some internal settings are possible like differential sensor offset set point range and the function cooling or heating By pushing the DOWN key more than 10 seconds you enter the internal programming menu In the left display the upper and lower segment are blinking Over the UP and DOWN keys the required parameter can be selected see table for the parameters If the required parameter is selected the value can be read out by pushing the SET key Pushing the UP or DOWN keys together with the SET key allows you to change the value of this parameter If after 20 seconds no key is pushed the ALFA 11 changes to it s normal operation mode Adjustment sensor The sensor can be adjusted by using the Sensor Offset parameter 04 Indicates the ALFA 11 e g 2 C too much the Sensor Offset has to de decreased with 2 C Error messages In the display of the ALFA 11 the following error messages can appear Er Sensor broken Solution Check if the sensor is connected correctly Check the sensor 1000Q at 25 C Replace the sensor EE Settings are lost Solution Reprogram the settings Technical details Model ALFA 11 Cool Heat Thermostat Range 50 150 C readout per 1 C Supply 230 Vac 50 60Hz Relay SPDT 250V 16A C NO 8A C NC cos phi 1 Control by push buttons on the front Front Polycarbonate Sensor SM 811
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