User manual ALFA 71 0/+150OF 24Vac Thermostat
Contents
1. 150 F display per 1 F Supply 24Vac 50 60Hz 5 10 Display 3 digit 7 segment display Relay Heating SPDT C NO NC 250V 8A cos p 1 or 250V 5A cos q 0 4 Analog out 0 10Vdc P l Cooling output Control By push buttons on front Front Polycarbonate IP65 Sensors 2x SM 811 2m PTC 10000 25 C Dimensions 35 x 77 x 71 5mm HWD Panel cutout 28x 70mm HW Accuracy 0 596 of the range Provided with memory protection during power failure Connections with screw terminals on the back side Equipped with sensor failure detection Special versions on request available Parameters ALFA 71 spec Para Description Parameters Default Meter Minimum setpoint setting Maximum setpoint setting Offset temperature sensor Switching differential relay heating Switching offset relay heating PI offset cooling Proportional band cooling Integration time 0 gives only P action 0 150 F 0 150 F ss 15 415 F 0 1 1 15 F 15 415 F 0 15 415 F 309F 0 99 Minutes Control delay after power failure 0 99 Minutes Software version Production year Production week Serial number x1000 Serial number units Address VDH Products BV Produktieweg 1 9301 ZS Roden The Netherlands Tel 31 0 50 30 28 900 Fax 31 0 50 30 28 980 Email info vdhproducts nl Internet www vdhproducts nl ALFA 71 spec Relay no 24Vac2. User manual ALFA 71 0 150 F 24Vac Me Thermostat SET lm ALFA 71 VDH doc 032181 Version v1 0 Datum 06 10 2003 Software ALFA71NR File Do032131 WP8 Range 0 4150 0 F 1 Functions The ALFA 71 spec is a thermostat with one temperature sensor one relay with function heating on off and one 0 10Vdc Pl output with function cooling The power supply is 24Vac Installation On the top side of the ALFA 71 spec is shown how the sensor power supply Pl output and relay are to be connected After connecting the ALFA 71 spec to the power supply a self test function is started As this test is finished the measured temperature appears in the display Control The ALFA 71 spec thermostat can be controlled by four pushbuttons on the front These keys are SET view change the setpoint UP increase the setpoint DOWN decrease the setpoint F hidden push button above the SET key and behind F symbol Viewing setpoint By pushing the SET key the setpoint appears in the display A few seconds after releasing the SET key the setpoint disappears and the measured temperature is shown again in the display Changing setpoint Push the SET key and the setpoint appears in the display Release the SET key Now push the SET key again together with the UP or DOWN keys to change the setpoint A few seconds after releasing the keys the measured temperature shows again in the display Status of the Outputs By pushin
3. g the hidden F key the display shows the status of the outputs The first segment indicates the status of relay heating 1 on O off The last two segments indicate the actual percentage of the Pl cooling output from 00 until 99 Setting internal parameters Next to the adjustment of the setpoint internal settings can be made like differential sensor offset setpoint range and the functions of the thermostat Push the DOWN key more than 10 seconds to 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 key to change the value of this parameter If after 20 seconds no key is pushed the ALFA 71 spec changes to the normal operation mode Adjustment sensors The Temperature sensor can be adjusted by using the Sensor Offset parameter 03 Indicates the Sensor e g 2 F to much the according Sensor Offset has to be decreased with 2 F Error messages In the display of the ALFA 71 spec the following error messages can appear E1 Sensor 1 failure Solution E1 Check if the sensor is connected correctly Check sensor 10000 at 25 C Replace sensor EEE Settings are lost Solution EEE Reprogram the settings Technical details Type ALFA 71 spec Thermostat Range 0
4. inp 24Vac inp Relay c Temp sens SM811 RELAY SUPPLY OUTPUT HEAT 24Vac 0 10Vdc OUT 1 ee OUT 2 Dimensions 77 E T 1 E EN S SASDSSNSSNSSS E Oy ES a i i AX 69 5 38 RR
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