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1. N 71mm Installation Fixing and dimensions of panel models To fix the unit slide the fastener through the guides as per the position shown in the figure Move the fastener in the direction of the arrow pressing tab it permits to move the fastener in the opposite direction of the arrow Once the controller has been connected they should be covered with the Silicon sealant should be applied along the perimeter of the panel cut out or a rubber O ring supplied before the unit is fitted to increase protection against water seepage Controller Controller should be installed in a place protected by vibration water and corrosive gasses and where ambient temperature does not exceed the values specified in the technical data Probe To give a correct reading the probe must be installed in a place protected from thermal influences which may affect the temperature to be controlled CAUTION WIRING The probe and its corresponding wires should never be installed in a conduit next to control or power supply lines The electrical wiring should be done as shown in the diagram The power supply circuit should be connected to a protection switch The terminals admit wires of upto 2 5sq mm WARNING Improper wiring may cause irreparable damage and personal injury Kindly ensure that wiring is done by qualified personnel only Maintenance Cleaning Cle2. 20 E8 parameter Function Defrost duration 1 Min 10 Min 5 Min during Coil probe failure Only manual E8 To change Use UP DOWN keys to get the E8 desired value and press SET parameter key press the Example if this is set to 5 min SET key then manual defrost for 5 min will take place during Coil probe fail 21 AL parameter Function Power on time delay 0 99Min 30Min for Alarm AL Tochange Use UP DOWN keys to get the AL desired value and press SET parameter key press the Example If you set this SET key parameter to 20 once the power is switched on the alarm will not activate for 20 minutes after the power is switched on This is most useful to avoid the nuisance alarms when the ambients are high when the machine is switched on after a long time Note After pressing Mute key buzzer will come ON after every 10 Mins til that fault gets cleared 22 FSparameter Revert to factory set parameter 0 1 0 FS Tochange 1 Revert to factory set theFS parameter parameter Useful to debug setting related press the problems SET key 23 LPparameter Function To lock keypad 0 1 0 LP Tochange Use UP DOWN keys to set the LP desired value parameter This parameter can lock the press the keypad so that tampering is SET key not possible by by standers 1 actives keypad lock 0 de activates keypadlock activation all the parameters can only be viewed but
3. INDIA www subzero co COLD ROOM CONTROLLER USER MANUAL SZ 7524 P Operation When operating in the field of refrigeration temperature control is performed with a positive differential The compressor stops when the Setpoint temperature is reached and restarts when the temperature reaches Setpoint plus the differential Two different defrost types can be selected electrical the compressor is stopped or at cycle inversion Warm gas the compressor keeps working It is also possible to select the interval between defrosts and the interval count type and a maximum time time out after which defrost is interrupted The same probe which controls the defrost cycle is used to control the evaporator fans It is possible to set the temperature the delay time after a defrost and relation of fans with the compressor A series of safety controls delay at start up minimum disable time minimum time between activation protects the compressors from close starts In case of probe error or temperature alarm the instrument signals the event through acoustic signal and by closing the relay contract By pressing the mute key the buzzer is silenced These functions can be easily customised by setting some programming parameters Other parameters allow to suit the instrument to various applications 52 7524 Introduction Features e 2 probes for cold room temp Evap coil temperature e
4. To set drip time for 0 Min 99 Min 1 Min defrost water to drain out P7 Tochange Use UP DOWN keys to get the P7 desired value This is the time parameter for which the fan compressor press the heater will stay off so that the SET key defrost water can drip amp drain out 8 P8parameter Function To set compressor 0 2 1 relay status on room probe failure 8 Tochange Use UP DOWN keys to set the P8 desired value parameter When set to press the 0 Comp status is ON SET key 1 Comp performs duty cycle 10 minutes ON and 4minutes OFF 2 Comp status is OFF 9 L1 parameter Evap fan stop temp 400150061 2 0 C L1 Use UP DOWN keys to set the 1 desired value This setting parameter is used to limit the max press the temperature beyond which the SET key Evap fan will cut off 10 L2parameter Function To set time delay 0 Min 20 Min 1 Min between Evap fan relay restart time 12 To change Use UP DOWN keys to set the L2 desired value If for example parameter this is set at 3 minutes the press the Fan relay will cutoff at the temp SET key set by L1 parameter but the fan will not come on fora minimum of 3 minutes even if 4 is achieved earlier 11 L3 parameter Function Evap Fan operation 0 1 1 when compressor is off 13 To change Use UP DOWN keys to set theL3 desired value parameter 0 Evap Fan is off when comp press the is off SET key 1 Evap Fan will stay on
5. not modified 24 rS parameter Function To change the resolution rS Tochange Use UP DOWN keys to set therS desired value parameter press the This parameter when set to 0 it SET key will take all parameter in 0 1 C resolution This parameter when set to 1 will take all parameter in 1 C resolution Note Temperature and parameter will also change accordingly 25 EPparameter Function To end programming EP To end Once the SET key is pressed programming the control goes into the normal press the mode and displays the SET key temperature and all settings are recorded To view coil temp UP key Down Key Down amp Program key Mute Key This key will mute the buzzer Manual defrost SZ 7524 P To force a Manual Defrost press this key for 4 seconds the unit will go into defrost mode If E4 parameter is set to 0 or Coil temp is greater than defrost stop temp this key will remain inactive Set Key Set key Operating messages and Icon status Temperature above the maximum limit of the set point Temperature below the minimum limit of the set point Probe short circuit circuit open or without probe or temperature lt 40 0 C or gt 50 0 C Set Point P4 Comp Rel off Ku On Off Alarm Ht Lt Flashing 4 Defrosting progress E3 E4 E5 n m Evap fan Relay on off L1 L4 Relay
6. workmanship for a period of year from the date of purchase During the warranty period product determined by us to be defective in form or function will be repaired or at our option replaced at no charge This warranty does not apply if the product has been damaged by accident abuse and misuse or as a result of service or modification other than by the company This warranty is in lieu of any other warranty expressed or implied In no event shall the company be held liable for incidental or consequential damages such as lost revenue or lost business opportunity arising from the purchase of this product 13 OUR OTHER PRODUCTS INDIA Cold Room Controller Chiller Controller Two Compressors Controller Heating Controller Humidity Controller Pressure Controller CASTLE Ball Valves Globe Valves Hand Valves Flow Switches Solenoid Valves 02 28 02 12
7. Range 40 0 C to 50 0 C Relay outputs Compressor Defrost Evap Fan Compressor protection algoriithm Auto Man defrosting facility Time Temp based Buzzer Output OPERATING INSTRUCTIONS Sr Parameter Parameter setting method value Min Max Fac Set 1 Set point Function To set the cutout P3 P2 0 0 C point of the controller Press and hold Display will change to set value SET key for and LED will flash The set point 2 second and value can now be changed by release using the UP DOWN key After setting the desired value Press the SET key and you will see which confirms that the set point has been stored in memory To set other parameter Press amp Hold Display will show P2 amp will 2 DOWN prg flash go to other parameters key use UP DOWN keys for 2 seconds 2 P2parameter Function To set maximum 50 0 50 0 allowable high temperature limit P2 To change the Use UP DOWN keys to set P2 parameter desired value Once setata press the particular value this will not allow SET key the set point to go above this value and below P3 setting AK Set pon Example Setting this parameter at25 0 C will not allow the set point to go above 25 0 C Also Message on Display ifthe temperature reaches 25 0 C the display will show Ht High Temp indicating thatthe temperature has gone
8. Timedelay Flashing Evap Fan Relay in Timedelay Technical data Housing Black ABS Plastic Front Cover Red Ploycarbonate plastic Dimensions Front 75 34 5 Depth 71MM w o back lid Panel Cutout 29X71mm Mounting Flush panel mounting with fasteners Protection Front panel is waterproof amp 65 rated Connection Screw terminal blocks lt 2 5sq mm one wire terminal only Display 3 14 2 MM 0 56 LED Data Storage Non Volatile EEPROM Memory Power Input Options 230Vac 10 50 60Hz Other on request Operating Temp 5 C to 50 C non condensing Storage temp 20 C to 70 C non condensing Output 3 SPDT relay 8 3 250Vac Input 2 NTC Probe Range 40 0 C to 50 0 C Resolution 1 C 0 1 C 1 Probe Tolerance at 25 0 3 C Alarm Buzzer SZ B75 10V 10mA SUGGESTED WIRING DIAGRAM SZ 7524 P 230V DEFROST E NC 52 75 SENS SEN 10Vdc 10mA max Caution Wiring for 230Vac Loads Only Heater 8 3 A max PHASE NEUTRAL SZ 7524 P 12VDC DEFROST 12VDC ROOM COIL NC 8806 To To To SZ B75 RENTS 10Vdc 10mA max Heater 8 3 A max PHASE NEUTRAL Caution Wiring for 230Vac Loads Only 11
9. Use UP DOWN keys to set the E2 desired value parameter 0 Total of real time press the For example if the unit goes into SET key defrost at this moment the calculation of time will start at that movement 1 Sum of total compressor operating times This means that for time calculation the unit will add the total time the compressor has been ON mode 7524 keepsa record of the hours worked 1 hourincase of a power failure Eg IfE3is setto 6 hrs and 3 1 2 hrs have passed after unit has started and power fails then defrost cycle will start after 3 hours when power resumes 17 E3parameter Function To set Defrost 1Hr 31 6 Hrs frequency E3 Tochange Use UP DOWN keys to set the E3 desired value This is the parameter amount of time between two press the defrost cycles SET key 18 E4parameter Function To set maximum 0 Min 99 Min 30 Min Defrost duration E4 Tochange Use UP DOWN keys to set the E4 desired value parameter This is the maximum amount of press the time allowed for a defrost SET key If set to 0 there will be no defrost cycle 19 E5parameter Defrost stop temperature 40 0 C 50 0 8 0 C coil probe E5 Tochange This is the maximum the E5 temperature allowable at which parameter the defrost process will stop press the SET key Defrost will stop according to E4 amp E5 parameter whichever is achieved earlier 7
10. above the value in this parameter and at this point the buzzer will come on 5 To change the P5 parameter press the SET key Use UP DOWN keys to set desired value In time it may be possible that the display may be offset by a degree or so To compensate for this error you may need to add or minus the degrees required to achieve the correct temperature Setting value is from 10 0 C to 10 0 C Example The temperature on the display is 28 0 C whereas the actual temperature is 30 0 C You will need to set the 5 mode to 2 0 C which means that once out of the programming mode that once out of the programming mode the temperature will show 30 0 C 28 0 C 2 0 C P6 parameter Function To set time delay between compressor relay restart time 0 Min 20 Min 3 Min 3 P3parameter Function To set minimum 40 0 C 40 0 C allowable Low temperature limit P3 To change Use UP DOWN keys to set the P3 desired value Once set at a will parameter particular value this not allow press the the set point to go below this SET key value and above P2 setting Example Setting this parameter _ 4 30 0 will not allow the set XX Set point point to go below 30 0 C Also if the temperature reaches Lt 30 0 C the display will show Message on Display Temp indicating that the temperature has gone below the value in this parameter and at this point t
11. an the surface of the controller with a soft moist cloth Do not use abrasive detergents petrol alcohol or solvents Notice The information in this document is subject to change in order to improve reliability design or function without prior notice and does not represent a commitment on the part of the company In no event will the company be liable for direct indirect special incidental or consequential damage arising out of the use or inability to use the product or documentation even if advised of the possibility of such damages No part of this manual may be reproduced or transmitted in any form or by any means without the prior written permission of the company Disclaimer This manual amp its contents remain the sole property of A S CONTROLS Pvt Ltd India and shall not be reproduced or distributed without authorisation Although great care has been taken in the prepartion of this document the company or its vendors in no event will be liable for direct indirect special incidental or consequential damage arising out of the use or inability to use the product or documentation even if advised of the possibility of such damages No part of this manual may be reproduced or transmitted in any form or by any means without the prior written permission of the company A S CONTROLS Pvt Ltd reserves the right to make and changes or improvements without prior notice Warranty This product is warranted against defects in materials and
12. he buzzer will come on 4 P4parameter Function Tosetthe comp 0 1 C 20 0 C 2 0 C differential hysterisis P4 Tochange Use UP DOWN keys to set the P4 desired value Differential parameter between cutout and cutin press the temperature can be set SET key between 0 1 C to 20 0 C Example Ifthe set point is set at 10 0 C and differential is set at 2 0 C then when the system reaches 10 0 C the comp relay will cutout Since the differential is 2 0 C the comp Relay will cutin at 12 0 C 10 0 C 2 0 C 5 P5parameter Function To set probe 1 10 0 C 10 0 C 0 0 C offset cold room temp calibration P6 To change the P6 parameter press the SET key Use UP DOWN keys to set desired value This parameter is used to protect the compressor from restarting in a short period of time and can be set between 0 to 20 minutes Example If this parameter is set at 3 minutes the relay will cut off at the set temperature but will cut off at the set temperature but will not restart fora minimum of 3 minutes even if the differential is achieved earlier This parameter is good to protect the life of the compressor or even in applications where the probe is placed at places where there are sudden amp shortin temperature like above a cold room door 7 P7 parameter Function
13. when compressor is off 12 L4parameter Function Evap Fan differential 0 1 C 20 0 2 0 C hysterisis L4 Tochange Use UP DOWN keys to set the L4 desired value parameter Example If L1 parameter is set press the to 2 0 C and the L4 is set to SET key 2 0 C then Evap fan will cut off at 2 0 C and restart only at 0 0 C 13 L5parameter Function To set probe 2 offset 10 0 10 0 C 0 0 C calibration Evap fan coil probe L5 Tochange Use UP DOWN keys to set the L5 desired value In time it may parameter be possible that the temp on press the the display may be offset SET key by a degree or so To compensate for this error you may need to add or minus the degrees required to achieve the correct temperature Setting value is from 10 0 C to 10 0 C 14 L6parameter Function Evap fan status 0 1 1 during defrost 16 To change Use UP DOWN keys to set the L6 desired value parameter 1 Evap fan will stay off during press the defrost SET key 0 Evap fan will stay on during defrost 15 Function To set type of defrost 0 1 0 E1 Tochange Use UP DOWN keys to set the E1 desired value parameter 0 Heater defrost in which case press the compressor is off SET key 1 Hot gas defrost where compressor is 16 E2parameter Function To set type of 0 1 0 computation for defrost time 2
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