User Manual ALFA 25 and ALFANET 25
Contents
1. 50 30 28 900 0 50 30 28 980 info vdhproducts nl Nederland Internet www vdhproducts nl2. Release the at SET key Now push the SET key again and together with the UP or DOWN keys the setpoint can be changed A few seconds after releasing the keys the measured temperature shows again in the display Starting stopping defrost The defrost cycle is automatically started and stopped Programming by the internal parameters During defrost the led defrost will light up If there is a defrost cycle the defrost can be stopped by hand pushing the UP key and then the SET key while the UP key is held If there is no defrost cycle the defrost can be started by hand pushing the UP key and then the SET key while the UP key is held Setting internal parameters Next to the adjustment of the setpoint some internal settings are possible like differential sensor offset setpoint range and the function cooling or defrost 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 lf after 20 seconds no key is pushed the ALFA NET 25 changes to it s normal operation mode Adjustment sensor The sensor can be adjusted by using the Sensor Offse
3. User Manual ALFA 25 and ALFANET 25 oi Cool Defrost Thermostat VDH doc 070700 Versie v1 0 Datum 19 03 2007 Software 043376 ALFA 15 25 35 File Do070700 wp8 amp Range 50 50 C per 1 C Function The ALFA NET 25 is a digital thermostat for panel mounting The thermostat controls the cooling and defrost Defrost will be done by temporarily switching off the cooling natural defrost The defrost starts on intervals or on compressor runtime The defrost stops on time The ALFANET 25 has a RS 485 network connection so it can be read out and adjusted on the Alfanet Installation On the topside of the ALFA NET 25 is shown how the sensor power supply and relay have to be connected After connecting the ALFA NET 25 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 NET 25 Thermostat can be controlled by three push buttons on the front These keys are SET view change the setpoint UP increase the setpoint DOWN decrease the setpoint Viewing setpoint By pushing the SET key the setpoint appears in the display The led set starts blinking A few seconds after releasing the SET key the setpoint disappears and the measured temperature is shown in the display Changing setpoint Push the SET key and the setpoint appears in the display
4. er Software version Production year Production week Serial number x1000 Serial number units 1 During delay time the LED on is flashing Technical details Model ALFA 25 Cool Defrost Thermostat ALFANET 25 Cool Defrost thermostat with Network Range 50 50 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 Communication RS485 Network 2x twisted pair shielded min 0 75mm Front Polycarbonate Sensor SM 811 2m 10000 at 25 C Demensions 144 x 72 x 50mm hbd Panel hole 139 x 67mm hb bij doorvoer in front 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 Dimensions Inbouwmaten Ye Connections Shield only at one side of the cable to Earth Place both term jumpers J2 J3 at both ends Pair 2 2xGND OV to 2xGND 0V of the RS485 network cable for termination Cable Min 0 5mm and max lenght 1KM Connect Pair 1 Line A to Line A and Line B to Line B 3 RS 485 ite white Supply 1 Relay 230Vac output Network cable aie T1 50 60Hz SPDT 2xTwisted pair Temp sensor s orelse see Max 16A Shielded type SM811 sticker at cosp 1 Remarks 1 No relay on ALFA NET 20 2 Optional second sensor 3 RS485 only at ALFANET serie
5. s RS 485 NETWORK CONNECTIONS 2 twisted pair shielded cable One of the Controllers can be the PC Interface Repeater is also a contr Place Terminator resistor of 250 Ohm only at both ends of the RS485 cable between line A and line B May be provided in the controller with a jumper For signal conditioning z Place Pullup down resistors 3 ov x41 gt Shield only at x Shield onlyat Only at one point in the S lt x aa f 4 S 2 one side of d 2 one side of Network May be provided in gj jg the cable 5 the cable the controller with jumpers 7 to Earth to Earth Oruse ALFA 1 TERMINATOR O A KD lt KDOOOHTI RIED bit h KDOLL pe 1 f Phebe gt lt gt c gt crcr hc d lt gt CxSKSKDO gt CHOHDS PES E A ERARE AENT S S Endpoint Network cable Connection Network cable Endpoint Network 2 twised pair shielded point 2 twised pair shielded Network min 0 5mm Network min 0 5mm Pair 1 A B Pair 2 Gnd Max Cable lenath 1KM Pair 1 A B Pair 2 Gnd Note 1 AVOID LONG STUB CABLES No longer than 0 5M otherwise use a Repeater Adresse VDH Products BV Tel 31 Produktieweg 1 Fax 31 9301 ZS Roden Email Network connections Pair 1 Connect A HI to A HI Connect B LO to B LO Pair 2 Connect GND 0V to GND 0V Shield Connect Shield to clean Earth only on one side of cable 0
6. t parameter 04 Indicates the ALFA NET 25 e g 2 C too much the Sensor Offset has to de decreased with 2G Error messages In the display of the ALFA NET 25 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 Function Diagam Function COOL Diff 1 150 Setpoint 50 50 C Parameters ALFA NET 25 Switching differential Minimum setpoint Maximum setpoint 1 30 C 50 50 C 50 50 C Offset temperature sensor 15 4 15 C Compressor start up protection 0 start up delay in sec 1 start up delay in min 2 delay between switch off and switch on min 3 delay between switch on and switch on min Compressor start up time belonging to parameter 05 Para Description Parameter Range Standard Value 3 50 50 0 0 10 Defrost cycle time 1 99 hrs Defrost time 0 99 min Defrost delay after power failure 0 99 min if parameter 14 is 1 Startup delay after power failure 0 99 min Relay on at sensor failure 0 No 1 Yes Defrost cycle time based on 0 No compressor on time 1 Yes Temperature display locked 0 No during defrost cycle 1 Yes After power failure starting 0 No with defrost cycle 1 Yes Maximum time display locked after defrost 0 60 min if parameter 13 1 Network numb
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