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Operating Instructions Class RA

1. C as bath liquid Technical data 07 03 2006 YAEE0018 Class RA LAUDA 10 Accessories Bath cover two parts RA 120 LCZ 0633 Rising platform 8 steps RA 106 LCZ 0646 Rising platform 8 steps RA 120 LCZ 0635 Tubing clamp stainless steel D EZS 012 For further accessories please contact us YAEE0018 07 03 2006 Accessories 27 BESTATIGUNG CONFIRMATION CONFIRMATION LAUDA An To A LAUDA Dr R Wobser LAUDA Service Center Fax 49 0 9343 503 222 Von From De Firma Company Entreprise StraBe Street Rue Ort City Ville Tel Fax Betreiber Responsible person Personne responsable Hiermit bestatigen wir daB nachfolgend aufgef hrtes LAUDA Ger t Daten vom Typenschild We herewith confirm that the following LAUDA equipment see label Par la pr sente nous confirmons que l appareil LAUDA voir plaque signal tique Typ Type Type mit folgendem Medium betrieben wurde was used with the below mentioned media a t utilis avec le liquide suivant Dar ber hinaus best tigen wir da das oben aufgef hrte Ger t sorgf ltig gereinigt wurde die Anschl sse verschlossen sind und sich weder giftige aggressive radioaktive noch andere gef hrliche Medien in dem Ger t befinden Additionally we confirm that the above mentioned equipment has been cleaned that all connectors are closed and that there are no poisonous aggressive radioactive or other dangerous media inside th
2. 9 TECHNICAL DATA ACCORDING TO DIN 12876 oues esse ee sees see Re Re Re Re Re GE Re GE ERA nnt 25 10 us sie dIE EE N EE EE EE IE HE 27 YAEE0018 07 03 2006 Table of contents LAUDA Class RA 1 Safety notes 1 1 General safety notes A laboratory thermostat is intended for heating and pumping liquids according to the needs of the user This leads to hazards by high temperatures fire and the general hazards by the use of electrical energy The user is largely protected through the application of the appropriate standard specifications Additional hazards may arise from the type of material being thermostated e g when going above or below certain temperature levels or through breaking of the container and reaction with the thermostating liquid It is not possible to cover all possibilities they remain largely within the responsibility and the judgement of the user The unit must only be used as intended and as described in these Operating Instructions This includes operation by suitably instructed qualified personnel The units are not designed for use under medical conditions according to EN 60601 1 or IEC 601 1 1 2 Other safety notes e Connect the unit only to grounded mains power PE e Parts of the bath cover may reach surface temperatures above 70 C when operating at higher temperatures Take care when touching it e Use suitable hoses Section 6 3 e Protect tubing with hose clips against slipping off
3. Prevent kinking of tubing e Check tubing from time to time for possible material defects e Heat transfer tubing and other hot parts must not come into contact with the supply cable e When using the thermostat as circulation thermostat failure of tubing may lead to leaking of hot liquid and become a danger to personnel and objects e When no external consumer is connected to the thermostat the pump outflow must be linked to the return e The units are designed for operation with non flammable liquids to EN 61010 2 010 only e Depending on the bath liquid used and the mode of operation it is possible for toxic vapours to be produced Ensure appropriate ventilation e Always pull out the mains plug before cleaning maintenance or moving the thermostat e Repairs on the control unit and the refrigeration system must be carried out by properly qualified personnel only e Values for temperature control and indicating accuracy apply under normal conditions according to DIN 12876 High frequency electromagnetic fields may under special conditions lead to unfavourable values This does not affect the safety 6 Safety notes 07 03 2006 YAEE0018 Class RA LAUDA Explanation of signs Danger This sign is used where there may be injury to personnel if a recommendation is not followed accurately or is disregarded Note Here special attention is drawn to some aspect May ee include reference to danger 2 Reference Refers to other in
4. min depending on the ambient temperature and the unit type until the nominal refrigerating capacity is reached YAEE0018 07 03 2006 Preparations 13 LAUDA 6 2 Filling and emptying Class RA Filling Close the drain cock Fill baths up to a maximum level of 20mm below the bath bridge Optimum operation at 20 40mm below the bath bridge Operation is possible down to 70mm below the bath bridge The protection against operation in case of an insufficient TI EE bath level operates approx 90mm below the bath bridge N N S SM m l 3 Es 90mm B Emptying Switch off the thermostat pull out the mains plug Drain the bath liquid through the drain cock gt using tubing Drain cock 2 14 Pre pa rations 07 03 2006 YAEE0018 Class RA LAUDA The units are designed for operation with non flammable liquids to EN 61010 2 010 When starting up the unit the tubular heater has to be covered with liquid When connecting an external consumer take care of the bath liquid level for it must not decrease too much gt fill in bath liquid if necessary Do not drain the thermostating liquid when it is hot or very cold below 0 C YAEE0018 07 03 2006 Preparations 15 LAUDA Class RA 6 3 Bath liquids and hose connections B
5. se EE Ee uses tec EE DNE Oe RE ee ee N De Re ER D Zea Gee ke eg vk ee ch 14 6 3 Bath liquids and hose connections EE nennen nenne nnne ee 16 6 4 Connection of external circuits sissies sense Red ee deed eN isdie eg dese ee oie de UR DE GEES 17 T STARTING OU SERE OE OR RE EE EN ER EE EE OE EA AREE 18 7 1 Connection to the supply issie Feeds Ee AER ee eR nine aeuo oua zo Ke Gede sede dee 18 rS inanem 18 1 3 El el SCISCH EEN 19 1 4 Warning and safety functions ses is es SEE de ees iater li pda Rusia Exo FE FUGO a Se ds BAT Po raga ve sp s 19 7 4 1 Overtemperature protection and testing iss se ee ER AE RR RA ee Ee ER RR ERA Ge Ge AAR ER RE RA ERA ee ee ee ee 19 7 4 2 Low level protection SEE EES EE Pom ee eed ee ee ENS Pe Pme nen a ee EE ee gee Peel 20 7 4 3 Pump motor monitoring 0 0 see ee EE EE RE RR RE RE RR RE RAAR RR RR RAGE RR RR RAGE RR KERR RE RR RR KEER RR RR SE RR RR RE EER nennt nnn 21 B MAINTENANCE E 22 x NEBULA SIT 22 4 Table of contents 07 03 2006 YAEE0018 Class RA LAUDA 8 2 Maintenance and repair een 22 8 2 1 Maintenance of the refrigeration unit ee ee RE RARR RE KERE RR RE RR GR nennen nennen nnne Re Ge RR EE nnns 23 8 2 2 Note on repair and disposal use ER RE RR REG Ge AE RA ER AR RE Rae Ge ER AR ER KERE Rae Ge nennen anni Re Ge Ge Ee ee Ek nnn 23 Repair and disposal by a qualified refrigeration engineer only 23 8 3 Ordering Spares ie ks tn EER DR ON Een RU RS DE ED Ee ae ie GN gee de Ee Ee RE 24
6. LAUDA Operating Instructions Class RA Cooling thermostats RA 104 RA 106 and RA 120 LAUDA DR R WOBSER GMBH amp CO KG Post office box 1251 97912 Lauda Koenigshofen Germany Valid from series 05 0001 see item 8 3 Phone 0049 0 9343 503 0 10 05 Fax 0049 0 9343 503 222 YAEE0018 E mail info lauda de Internet http www lauda de Class RA LAUDA Safety notes Before operating the equipment please read carefully all the instructions and safety notes If you have any questions please phone us Follow the instructions on setting up operation etc This is the only way to avoid incorrect operation of the equipment and to ensure full warranty protection Transport the equipment with care The unit may NEVER be overturned nor put upside down Equipment and its internal parts can be damaged by dropping by shock Equipment must only be operated by technically qualified personnel Never operate the equipment without the bath liquid Do not start up the equipment if itis damaged or leaking the supply cable is damaged Switch off the equipment and pull out the mains plug for servicing or repair before moving the equipment Drain the bath before moving the equipment Do not carry out any technical changes on the device Have the equipment serviced or repaired by properly qualified personnel only The Operating Instructions include additional safety notes which are identifi
7. ath liquids Working LAUDA tem Chemical Designation perature Designation range Former from C mm s at E MEE A to C NN 20 C ol ofo Viscosity kin at temperature Ref No Quantity Kryo309 G100 30 90 Monoethylen 50 at 25 C LZB 109 LZB 209 LZB 309 glycol water IER At higher temperatures gt Evaporation losses gt Use bath covers Section 10 Accessories Distilled water or fully deionised water must only be used with the addition of 0 1g sodium carbonate Na2COs litre water otherwise gt danger of corrosion Water content falls after prolonged operation at higher temperatures gt mixture becomes flammable flash point 128 C gt Check the mixture ratio with a dosimeter Safety data sheets are available on request Hose connections Int dia Temperature Application Ref No mm range C for all bath liquids 10 120 except for Ultra 350 RKJ 111 and mineral oils EPDM tubing for all bath liquids non insulated 12 ud except for Ultra 350 LZS 019 and mineral oils Tubing type EPDM tubing non insulated Silicone tubing ocu Silicone tubing non insulated EPDM tube is not suitable for Ultra 350 and not suitable for mineral oils Silicone oil causes pronounced swelling of Silicone rubber never use Silicone oil with Silicone tubing Protect tubing with hose clips against slipping off 16 Preparations 05 03 2007 YAEE0018 Class RA LAUDA 6 4 Connection of
8. can be cleaned with water adding a few drops of detergent washing up liquid using a moist cloth Water must not enter the control unit Carry out appropriate detoxification if dangerous material has been spilled on or ame inside the unit Method of cleaning and detoxification are decided by the special knowledge of the user In case of doubt please contact the manufacturer 8 2 Maintenance and repair Before any maintenance and repair work pull out the mains plug Repairs on the control unit must only be carried out by properly qualified personnel LAUDA thermostats are largely maintenance free If the thermostating liquid becomes dirty it has to be replaced gt Section 6 2 fe Ifa fuse blows gt supply indication not alight fit only fuses as specified Bath Circulation thermostats F8A size 5 x 20 gt fuses are accessible from the outside 22 Maintenance 07 03 2006 YAEE0018 LAUDA Class RA 8 2 1 Maintenance of the refrigeration unit The refrigeration unit operates largely without maintenance Depending on the ambient dust conditions and the operating time any dust on the heat exchanger condenser must be removed at intervals on 2 weeks or longer This is done after taking off the front grille Brush off the condenser and if necessary blow through with compressed air 8 2 2 Note on repair and disposal The refrigeration ci
9. e equipment D autre part nous confirmons que l appareil mentionn ci dessus a t nettoy correctement que les tubulures sont ferm es et qu il n y a aucun produit toxique agressif radioactif ou autre produit nocif ou dangeureux dans la cuve Stempel Datum Betreiber Seal Cachet Date Date Responsible person Personne responsable Formblatt Form Formulaire Unbedenk doc LAUDA DR R WOBSER GmbH amp Co KG Erstellt published tabli LSC PfarrstraBe 41 43 Tel 49 0 9343 503 0 And Stand config level Version 0 1 D 97922 Lauda K nigshofen Fax 49 0 9343 503 222 Datum date 30 10 1998 Internet http www lauda de E mail info lauda de UNBEDENK DOC
10. ed by a triangle with an exclamation mark Carefully read the instructions and follow them accurately Disregarding the instructions may have serious consequences such as damage to the equipment damage to property or injury to personnel We reserve the right to make technical alterations YAEE0018 07 03 2006 Safety notes LAUDA Class RA TABLE OF CONTENTS raise fe 3 UE JJ u hde ipe 6 La EE CI CIELU d VAueccImT 6 1 2 Other safety notes usi nri reete eN p ne rara i iia mar Frick ada csi adn a Ea a ese an 6 2 BRIEF OPERATING INSTRUCTIONS uie eee esse esse esse ee sees sees sees Re nett tht tnnt nnn 8 A CONTROL AND FUNCTIONAL ELEMENTS une 9 4 UNIT DESCRIPTION DR 10 4 1 Environmental conditions e ccc eiie ino oe ie nne inia D ENE DK eege Ede 10 4 2 r 10 EO rm 10 LP SM PUMP ER N EE TT 10 A D EI CINEI scu EP 11 4 6 Temperature indication control and safety circuit ERA ERGE ERG ERG EE Ee 11 4 1 Refrigeration SY SCCM iue cecus neenon dior iain cents iC Rai ee d a ee s E EE RE X Bx 11 NEM el dlc 12 6 PREPARATIONS eioreces esent ERK EE AE EO EE RE ED 13 6 1 Assembly and setting Up i e eine ore ge GE Ga eeu grav En ee ee Su Cu Ru RR Sa aa ee eend N de 13 6 2 Fillinig ANG SM DEVIN Os
11. emperature range C 40 C Temperature control C 0 05 Safety features NFL suitable for non flammable liquids Heater power x 1 5 Cooling capacity eff at 20 C ambient temperature Pump type pressure pump Max discharge pressure bar 0 15 Max flow rate l min Pump connections mm nipples 8 mm Max bath volume A o 14 20 mm 130x105 150x130 180x320x524 200x400x557 Bath opening W x D 300x350 Bath depth 160 Usable depth 140 mm Height top edge of bath mm 441 Overall size W x D x H mm 350x530x602 Weight 23 5 A CH x Q e See Ref No below Mains powersupply protection class 1 to DIN VDE 106 1 N Power consumption 230 V 50 60Hz 230 V 50 Hz 1 8 NL 230V110 50 60Hz 230V110 50Hz LCK 1906 Units to EU Directive 89 336 EWG EMC and 73 23 EWG low voltage with CE mark We reserve the right to make technical alterations YAEE0018 07 03 2006 Technical data 25 26 Badtemperatur Bath temperature Temp rature du bain C LAUDA Class RA Pump characteristics bar 0 15 0 1 0 10 12 L min compact thermostat Immersion thermostat measured with water Cooling curve measured with ethanol 20 00 10 00 4 0 00 10 00 0 00 0 30 1 00 1 30 2 00 Abk hlzeit Cool down time Temps de descente h min Bath liquid Time from graph water glycol 1 1 x17 to 25
12. external circuits Operation as circulation thermostat When used as circulation thermostat care for shortest hose connections with largest inner diameter as possible This gives the best flow Connect 9mm int dia tubing Section 6 3 to the pump connector Pump connections return to bath pump outflow pump pressure labelling housing If the cross section of the tubing is too small gt temperature drop between bath and external system due to low flow rate Increase the bath temperature appropriately Always ensure the maximum possible flow cross section in the external circuit When the external consumer is placed at a higher level than the thermostat the pump is stopped and air penetrates into the thermostating circuit the external liquid may drain down into the bath even with a closed system danger of flooding the thermostat Protect tubing with hose clips against slipping off When no external consumer is connected to the thermostat the pump outflow YAEE0018 07 03 2006 connection must be linked to the return Preparations 17 7 7 1 18 LAUDA Class RA Starting up Connection to the supply Compare the supply voltage against the data on the rating label Model according to EMC directive EN 61326 1 class B industrial and domestic areas if the nominal current of the current feeding point is gt 100 A Otherwise only according to class A industrial areas Connect the u
13. formation in different sections YAEE0018 07 03 2006 Explanation of signs 7 LAUDA Class RA 2 Brief operating instructions This brief instruction shall give you the possibility to operate the unit quickly For safe operation of the unit it is absolutely necessary to read carefully all the instructions and safety notes 1 Assemble unit and add items as appropriate Section 6 The unit may NEVER be overturned nor put upside down Take care of the hose connections Section 6 3 and 6 4 2 Fill the unit with corresponding liquid Section 6 3 The units are designed for operation with non flammable liquids to EN 61010 2 010 gt Take care of the level of the bath liquid gt Section 6 2 3 Connect the equipment only to a socket with a protective earth PE connection Compare the information on the rating label with the supply details 4 i Es Set the overtemperature cut out point to a value clearly above ambient 20 80 temperature Section 7 4 1 Lex E atr Switch on at the mains switch green O The refrigeration unit is to be switched on manually yellow switch if cooling is needed 8 Brief operating instructions 07 03 2006 YAEE0018 Class RA LAUDA 3 Control and functional elements Reference thermometer Pilot lamp Heater Pilot lamp Fault Temperature adjustment Overtemperature adjustment and push button Reset Mains switch and switch for the cooling
14. kim for all models insulated EZB 260 1 for all models Warning label YAEE0018 1 Operating Instructions for all models 12 Unpacking 07 03 2006 YAEE0018 Class RA LAUDA 6 Preparations 6 1 Assembly and setting up Place the unit on a flat surface ame The unit may NEVER be overturned or put upside down After transport and before starting up store it standing in upright position for two hours if possible Do not cover the ventilation openings at the back of the unit and its lower part l Keep clear distance of at least 40cm PI r Push the reference thermometer into the spring mounting at the right side of the unit Operation with external consumer circulation thermostat Section 6 4 When operating as bath thermostat without external consumer the pump outflow connection has to be linked to the return At bath temperature above 70 C the label supplied must be affixed on the bath in a clearly visible position The unit can be operated safely up to an ambient temperature of 40 C Depending on the loading of the refrigeration system a temporary shut off can occur especially in case of an ambient temperature of over 35 C Additionally a higher ambient temperature results in less refrigerating capacity When starting up the refrigeration system after a longer time it can take up to 30
15. led compressor Heat of condensation and motor heat are dissipated by a fan cooled finned condenser Fresh air is drawn in at the front of the unit warmed air is discharged at the back and to the sides The ventilation openings must not be restricted in order to ensure proper air circulation The refrigeration system operates continuously to remove a certain amount of heat with the heater acting in opposition to provide automatically controlled heating power The compressors are fitted with a temperature monitor which responds both to the compressor temperature and to the motor current In addition the cooling system is protected against excessive pressure by a pressure monitor When the fault circuit is activated the refrigeration system is also switched off Cooling curves Section 9 Technical Data YAEE0018 07 03 2006 Unit description 11 LAUDA 5 Unpacking Class RA After the unit and accessories have been unpacked they have to be examined for possible transport damage If there is any damage visible on the unit the forwarding agent or the post office has to be notified so that the shipment can be examined Standard accessories Reference tity Designati mber Quantity Designation Glass control thermometer ET 034 1 30 120 C for all models HDQ 084 1 Bath cover only with RA 104 HDQ 085 1 Bath cover only with RA 106 UD 435 1 Closing plugs for all models LZS 001 p Pump connection lin
16. nit only to a grounded mains power socket PE No warranty when the thermostat is connected to a wrong supply Please make sure that your mains plug is equipped with at least the following safety fuses Power supply Fuse protection 230V 16A 208V 15A 115V 15A The start current of the refrigerating machine may exceed those currents distinctly for a short time Without external circuit ensure that the pump pressure outflow is closed or linked to the pump return Ensure that the unit is filled in accordance with Section 6 2 rates Set the overtemperature switch off point to a value 20 80 clearly above ambient temperature 0 100 Tour cc Switch on at the mains switch The green light for Supply ON lights up itionally switch on the cooling unit yellow switch i ZS E Additionall itch on th li it yell itch if cooling is needed ndication of the current bath temperature on the reference thermometer If necessary add more bath liquid to replace oe the amount pumped out to the external circuit Notice only valid for EU countries Starting up 07 03 2006 YAEE0018 Class RA O A 7 3 Set point selection Pan 30 40 50 20 RA 7 4 Warning and safety functions If the pilot lamp Fault lights up 2 Adjust the overtemperature switch off point at a higher temperature then reset by pressing the turning knob Overtemperature adjustment and Reset button Adjust the desired set poi
17. nt with the button for the temperature adjustment resolution approx 0 3 C When the set point is reached the pilot lamp Heater flashes Check at the reference thermometer if the c bath temperature corresponds to the selected set point gt readjust set point if necessary 7 4 1 Overtemperature protection and testing The units are designed for operation with non flammable liquids to fe EN 61010 2 010 40 60 20 80 0 100 ur C YAEE0018 07 03 2006 Set the overtemperature switch off point Recommended setting 5 C above required bath temperature When the bath temperature arises above the overtemperature switch off point the pilot lamp Fault flashes The heater and the pump are switched off Wait until the heater has cooled down under the switch off point rectify the fault liquid level too low faulty control failure of tubing then reset by pressing the button Starting up 19 LAUDA Class RA Before the unit is running unattended for longer periods the overtemperature Te protection should be tested Therefore TUN turn the potentiometer slowly anticlockwise The unit 20 ag S must switch off at the bath temperature 0 100 E mr Red pilot lamp Fault flashes Readjust the overtemperature switch off point to a value 0 100 above bath temperature and reset by pressing the button C E Ifthe unit does not switch off when testing the overtemperatu
18. rcuit is filled with a CFC free refrigerant Type and charging quantity are indicated on the unit Repair and disposal by a qualified refrigeration engineer only Before the equipment is being returned to the factory it is recommened to contact our technical service If the equipment has to be returned to the factory please ensure that it is carefully and properly packed LAUDA accepts no responsibility for damage due to unsatisfactory Te packing Maintenance YAEE0018 07 03 2006 23 LAUDA Class RA 8 3 Ordering spares When ordering spares please quote instrument type and serial number from the rating label This avoids queries and supply of incorrect items The serial number is combined like following for example LCK0904 06 0001 LCK0904 Article order number Ref No 06 manufacturing year 2006 0001 continuous numbering Your contact for service and support LAUDA Service Centre Phone 49 0 9343 503 236 English and German E mail service lauda de We are available any time for your queries suggestions and criticism LAUDA DR R WOBSER GMBH amp CO KG Post office box 1251 97912 Lauda Koenigshofen Germany Phone 49 0 9343 503 0 Fax 49 0 9343 503 222 E mail info lauda de Internet http www lauda de 24 Maintenance 07 03 2006 YAEE0018 9 Class RA LAUDA Technical data according to DIN 12876 TT we me va Operating temperature range 10 100 20 100 20 100 Ambient t
19. re protection switch off the equipment immediately and pull out the mains plug Have the equipment checked by the LAUDA service or the local service organisation 7 4 2 Low level protection 1 If the liquid level drops so far that the tubular heater is no Q longer covered with liquid and heating starts the red pilot lamp Fault flashes Heater and pump are switched off A Protection against operation in case of an insufficient bath level 2 Refill the bath Section 6 2 or rectify the fault failure of tubing etc 40 20 3 Reset with the button 0 100 ur C If there is any irregularity when testing the safety devices switch off the unit immediately and pull out the mains plug Have the unit checked by the LAUDA service or the local service organisation The heater surface can reach temperatures up to 250 C when there is not enough liquid in the bath Danger of burning injuries Use only non flammable liquids otherwise Danger of fire 20 Starting up 07 03 2006 YAEE0018 Class RA LAUDA 7 4 3 Pump motor monitoring IER n case of pump motor overload or a blockage the heating and the pump are switched off O Red pilot lamp Fault flashes After motor has cooled down the thermostat starts up again automatically YAEE0018 07 03 2006 Starting up 21 LAUDA Class RA 8 Maintenance 8 1 Cleaning Before cleaning the unit pull out the mains plug The unit
20. ss steel bath The last two digits of the model no correspond to the approximate total volume in Litre e g bath RA 106 approx 6 Litre Part of this volume may be used to insert objects 4 4 Pump All units are equipped with a pressure pump The pumps are driven by a shaded pole motor The pump outflow connection can be closed without causing any damage to the pump Pump characteristics section 9 Technical data 10 Unit description 07 03 2006 YAEE0018 Class RA LAUDA 4 5 Materials All parts which come into contact with the bath liquid are made from high grade materials appropriate to the operating temperature Rust free stainless steel is being used 4 6 Temperature indication control and safety circuit The units are provided with a potentiometer for analogue temperature setting resolution approx 0 3 C The actual bath temperature is indicated on a reference thermometer glass with a resolution of 0 5 C The thermostats are provided with an adjustable overtemperature cut out switch avoiding the operation of the heater in case of an insufficient bath level The pump motor is provided with a temperature protector which avoids an overtemperature of the motor Both functions will switch off heater and pump With a P controller the heating capacity is electronically controlled by a zero voltage packed switching triac 4 7 Refrigeration system The refrigeration system consists essentially of a hermetically sea
21. unit Heater Jet nozzle Pump connections Return to the bath Pump outflow Pressure output labelling housing YAEE0018 07 03 2006 Control and functional elements LAUDA Class RA 4 Unit description 4 1 Environmental conditions The operation of the thermostats is only allowed under the following conditions as specified in EN 61010 2 010 2003 and EN 61010 1 2001 ndoor use Altitude up to 2000 m above sea level Foundation must be dense even non slippery and non flammable Keep clear distance Section 6 1 Ambient temperature range Section 9 Use only within this range for an undisturbed operation Mains supply voltage fluctuations Section 9 Maximum relative humidity 80 96 for temperatures up to 31 C decreasing linearly to 50 relative humidity at 40 C Transient over voltage according to Installation Categories Over voltage Categories Il Pollution degree 2 4 2 Unit types The type designation of the Class RA low temperature thermostats consists of the letter R identification as low temperature unit the control unit A 100 and the type of bath and refrigeration system Example Refrigeration unit R control unit A 100 and bath and refrigeration system 004 produces thermostat type RA 104 Type RA 120 is supplied without bath cover A bath cover is available as accessory Section 10 Accessories 4 3 Baths All units provide a stainle

Operating Instructions Class RA

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