IS 974 LX electroic cotrollers for forced air refrigeratig uits This famil cosist of a mai uit called IS ad a expasio module called EWEM, coected together with a telephoe cable. USER INTERFACE The user has a displa ad four kes for cotrollig status ad programmig of the istrumet. KEYS AND MENUS UP ke DOWN ke fc ke set ke Scrolls through the meu items Icreases the values Activates maual def. fuctio Scrolls through the meu items Decreases the values Programmable b parameter ESC fuctio (exit) Programmable b parameter Accesses the setpoit Accesses the meus Cofirms the commads Displaig the alarms (if preset) At start-up the istrumet performs a Lamp Test; for few secods the displa ad the leds blik, i order to verif their itegrit ad correct operatio. The istrumet has two mai meus: the Machie Status ad Programmig meu. ACCESSING AND USING MENUS Resources are arraged i a meu, which ca be accessed b pressig ad quickl releasig the set ke ( Machie Status meu) or b holdig dow the set ke for more tha 5 secods ( Programmig meu). To access the cotets of each folder, idicated b the relevat label, just press the set ke oce. You ca ow scroll through the cotets of each folder, modif it or use its fuctios. If ou do ot use the keboard for over 5 secods (time-out) or if ou press the fc ke oce, the last value show o the displa is cofirmed ad ou retur to the previous scree mask. LED fc set MACHINE STATUS MENU To access the Machie Status meu Press ad quickl release the set ke. If alarms are ot preset, the label SEt appears. B usig the UP ad DOWN kes ou ca scroll through the other folders i the meu: -AL: alarm folder (if preset); -Pb: probe value folder; -Pb: probe value folder -SEt: Setpoit settig folder. Set Settig Access the Machie Status meu b pressig ad quickl releasig the set ke. The label of the SEt folder appears. To displa the Setpoit value press the set ke agai. The value appears o the displa. To chage the Setpoit value, use the UP ad DOWN kes withi 5 secods. If the parameter is LOC = the Setpoit caot be chaged. Alarm o If alarm coditio exists, whe accessig The Machie Status meu the AL folder label appears (see the Diagostics sectio). Displaig Probes B pressig the set ke whe the appropriate label appears, the value of the probe associated to it is displaed. PROGRAMMING MENU To access the Programmig meu, press the set ke for more tha 5 secods. If specified, the level access PASSWORD will be requested (see parameter PA ) ad (if the password is correct) the label of the first folder will follow. If the password is wrog, the displa will show the PA label agai. To scroll other folders, use the UP ad DOWN kes; the folders cotai the level ad parameters. The level parameters ma be protected b a secod password (see PA parameter). If specified, level parameters are hidde to user; at the etrace of the Cf folder the level access PASSWORD will be Positio Related Fuctio Status Compressor or rela ON whe the compressor is started up; blikig i case of dela, protectio or blocked eablig Defrost Alarm Fas ON whe defrostig; blikig i case of maual eablig ON whe the alarm is eabled; blikig whe the alarm is sileced ON whe the fa is workig requested ad (if the correct password is etered) the label of the first folder i the programmig meu will follow. To eter the folder, press set. The label of the first visible parameter appears. To scroll through the other parameters, use the UP ad DOWN kes; to chage the parameter, press ad release set, the set the desired value usig the UP ad DOWN kes, ad cofirm with the set ke to move to the ext parameter. PLEASE NOTE: It is strogl recommeded to switch off ad switch o agai the cotroller atime parameters have bee chaged to prevet malfuctioig o cofiguratio ador ogoig timigs. PASSWORD The passwords PA ad PA allow access respectivel to level ad level parameters. I the stadard cofiguratio passwords are ot preset. To eable them ad assig them the desired value, access the Programmig meu, withi the folder with the dis label. If passwords are eabled, the will be requested: - PA at the etrace of the Programmig meu (see the Programmig Meu sectio); - PA withi the folder with the Cf label cotaiig level parameters. MANUAL ACTIVATION OF THE DEFROSTING CYCLE To mauall activate the defrostig ccle, press the UP ke for 5 secods. If defrostig coditios are ot preset, (for example the evaporator probe temperature is higher tha defrost stop temperature or if parameter OdO ), the displa will blik three (3) times, i order to idicate that the operatio will ot be performed. COPY CARD The Cop Card is a accessor coected to the TTL serial port which allows programmig quickl the istrumet parameters (upload ad dowload parameter s map). The operatio is performed as follows: Format This commad allows cop card formattig, a operatio ecessar i case of first use or to cop maps with differet models. Warig: if the cop card has bee programmed, usig the Fr the data etered are erased. This operatio caot be cacelled.
Upload This operatio loads the programmig parameters from the istrumet. Dowload This operatio dowloads to the istrumet the programmig parameters. The operatios are performed accessig the folder idetified b the FPr label ad selectig, accordig to the case, UL, dl or Fr commads; the operatio is cofirmed b pressig the set ke. If the operatio is successful a is displaed, o the cotrar, if it fails a will be displaed. Dowload from reset (istrumet OFF Coect the co card with the istrumet OFF (ot uder voltage). Whe the istrumet is switched o the programmig parameters will be dowloaded ito the istrumet; after the lamp-test the dipla will show for about 5 secods: label dly if cop operatio successful label DL if ot PLEASE NOTE: after the dowload operatio the istrumet will immediatel work with the ew parameters map settig. TELEVIS SYSTEM The lik with the Televis sstem ca go through the serial port TTL (the BUS ADAPTER TTL RS-485 iterface module must be used). I order to cofigure the istrumet for this purpose ou must access the folder idetified b the Add label ad use the parameters dea ad FAA. KEYBOARD LOCKING The istrumet icludes a facilit for disablig the keboard, b programmig the Loc parameter (see folder with dis label). If the keboard is locked, ou ca still access the programmig meu b pressig the set ke. The Setpoit ca also be viewed. DIAGNOSTICS The alarm coditio is alwas sigalled b the buzzer (if preset) ad b the led of the alarm ico The alarm sigal produced b a fault thermostat probe (referred to probe ) is show as E o the istrumet displa The alarm sigal produced b a fault evaporator probe (probe ) is show as E o the istrumet displa. Error table DISPLAY E E ERROR Thermostat probe fault Evaporator probe fault If simultaeous the will appear o displa with secods alteratio The error coditio of the probe (thermostat) causes the followig: the code E is displaed the compressor is activated as idicated b the "O" ad "Off" parameters if programmed for the dut ccle or: Ot > > The error coditio of the probe (evaporator) causes the followig: viewig E code o the displa ed of defrost because of time-out Other sigallig alarm are ot show o the istrumet displa, but from the Machie Status meu withi the AL folder. MINIMUM AND MAXIMUM TEMPERA- TURE ALARMS Regulatio of the miimum ad maximum temperature alarms refers to the thermostat probe. The temperature limits defied b the HAL (maximum temperature alarm) ad LAL parameters (miimum temperature alarm) are i absolute temperature value. Whe a alarm status occurs, if o alarm exclusio phases are uderwa (see alarm exclusio parameters), the alarm set ico is lit up ad the buzzer, ador the rela cofigured as a alarm, is activated. The occurrece of this alarm does ot i awa effect the cotrol activities i progress. This alarm status ca be viewed i the AL folder with AH-AL labels. DISPLAY AH AL Ad EA opd Oft > > INSTALLATION Compressor output OFF OFF ON D.C. ALARM High temperature alarm (referred to the thermostat probe or probe ) Low temperature alarm (referred to the thermostat probe or probe ) Ed of defrost due to time-out Esteral alarm Ope door alarm To silece alarms press a ke. If sileced the LEDs will blik Alarms are i absolute value or related to Setpoit ad (cosidered as the distace from the Setpoit itself) depedig o Att parameter. The istrumet is desiged for pael moutig. Make a hole of 9x7 mm, isert the istrumet ad fix it usig the brackets provided. Do ot mout the istrumet i humid ador dirt places; it is suitable for use i ordiar polluted places. Vetilate the place i proximit to the istrumet collig slits. ELECTRICAL WIRING Attetio! Never work o electrical coectios whe the machie is switched o. The istrumet is equipped with screw termial boards for coectio of electrical cables with a diameter of.5 mm (oe coductor ol per termial for power coectios). For the capacit of the termials, see the label o the istrumet. The rela cotacts are voltage free. Do ot exceed the maximum curret allowed; i case of higher loads, use a appropriate cotactor. Make sure the power suppl voltage complies with the oe required b the istrumet. I V versios the power suppl must be provided b a securit trasformer with the protectio of a delaed 5 ma fuse. Probes have o coectio polarit ad ca be exteded usig a regular bipolar cable (ote that the extesio of the probes affects the EMC electromagetic compatibilit of the istrumet: pa extreme attetio to wirig). Probe cables, power suppl cables ad the TTL serial cables should be distat from power cables. CONDITIONS OF USE PERMITTED USE For safet reasos the istrumet must be istalled ad used accordig to the istructio provided ad i particular, uder ormal coditios, parts bearig dagerous voltage levels must ot be accessible. The device must be adequatel protected from water ad dust as per the applicatio ad must also ol be accessible via the use of tools (with the exceptio of the frotlet). The device is ideall suited for use o household appliaces ador similar refrigeratio equipmet ad has bee tested with regard to the aspects cocerig Europea referece stadards o safet. It is classified as follows: accordig to its maufacture: as a automatic electroic cotrol device to be icorporated b idepedet moutig; accordig to its automatic operatig features: as a B-tpe operated cotrol tpe; as a Class A device i relatio to the categor ad structure of the software UNPERMITTED USE A other use other tha that permitted is de facto prohibited. It should be oted that the rela cotacts provided are of a practical tpe ad therefore subject to fault. A protectio devices required b product stadards or dictated b commo sese due to obvious safet reasos should be applied exterall. IS 974 LX 6
LIABILITY AND RESIDUAL RISKS Ivess Cotrols Ital S.r.L. shall ot be liable for a damages derivig from: - istallatiouse other tha that prescribed ad, i particular, that which does ot compl with safet stadards aticipated b regulatios ador those give herei; - use o boards which do ot guaratee adequate protectio agaist electric shock, water or dust uder the coditios of assembl applied; - use o boards which allow access to dagerous parts without the use of tools; - tamperig with ador alteratio of the products; DISCLAIMER This maual ad its cotets remai the sole propert of Ivess Cotrols Ital s.r.l., ad shall ot be reproduced or distributed without authorizatio. Although great care has bee exercised i the preparatio of this documet, Ivess Cotrols Ital s.r.l., its emploees or its vedors, caot accept a liabilit whatsoever coected with its use. Ivess Cotrols Ital s.r.l. reserves the right to make a chages or improvemets without prior otice. TECHNICAL DATA IS 974 LX Frotal pael protectio: IP65. Casig: plastic bod i resi tpe PC+ABS UL94 V-, ispectio widow i polcarboate, buttos i thermoplastic resi. Dimesios: frotal pael 74x3 mm, depth 3 mm. Istallatio: o pael, with drillig template 7x9 mm (+.. mm). Use temperature: 5 55 C. Storage temperature.: 3 85 C. Use eviromet humidit: 9 % RH Storage eviromet humidit: 9% RH Viewig rage: 5 (NTC); 5 4 (PTC) C without decimal poit (selectable through parameter o 3 digit & + mark displa. Aalog iputs: two PTC or NTC iputs (programmable b parameter). Digital iput : cofigurable low voltage digital iput Coectios: telephoe coector for the coectio with EWEM 43 power module, screw coectors for digital iput. Serial: TTL for coectio to Cop Card or Televis sstem. Measurig rage: from 5 to 4 C. Accurac:.5% better tha ed scale + digit. Resolutio: or. C. Power: 3 VA. Power suppl: from EWEM 43 power module. TECHNICAL DATA EWEM 43 Casig: plastic 4-Di module 7x85 mm (.75x3.34"). Depth: 6 mm (.4"). Moutig: Di-rail (Omega 3) or surface moutig. Coectios: telephoe coector for the coectio with IS 974 LX mai module. Use temperature: 5 5 C. Storage temperature: 3 75 C. Use eviromet humidit: 9 % RH Storage eviromet humidit: 9% RH Aalog iputs: two NTC or PTC tpe (selectable b parameter cofigurable from displa o IS 974 LX mai module). Digital outputs: SPST output o 5()A 5Va rela, SPDT output o (7)A 5Va rela ad SPST outputs o 8(3)A 5Va relas, cofigurable. Power suppl: 3 Va ±5%. Warig: check the power suppl specified o the istrumet label; for rela ad power suppl capacities, cotact the Sales Office). Ivess Cotrols Ital s.r.l via dell'idustria, 5 Zoa Idustriale Paludi 3 Pieve d'alpago (BL) ITALY Telephoe +39 437 986 Facsimile +39 437 98966 Iteret http:www.climate-eu.ivess.com 9 eg cod. 9IS53 IS 974 LX 36
Tab. Parameter Table PAR. DESCRIPTION COMPRESSOR REGULATOR (folder with CP label) dif differetial. Rela compressor trippig differetial. The compressor stops o reachig the Setpoit value (as idicated b the adjustmet probe), ad restarts at temperature value equal to the Setpoit plus the value of the differetial. Note: the value caot be assumed. HSE Higher SEt. Maximum possible setpoit value. LSE Lower SEt. Miimum possible setpoit value. OSP Offset Setpoit: temperature value to be added algebraicall to the setpoit i the case of reduced set eabled (Ecoom fuctio). It ca be activated through digital iput or b a ke cofigured for such use. Cit Compressor mi o time. Miimum compressor activatio time before a possible disablig. If set at it is ot active CAt Compressor max o time. Maximum compressor activatio time before a possible disablig. If set at it is ot active dod digital (iput) Ope door. Digital iput user shut off. = es; = o. Valid for parameter H = ±4 (door switch). dad digital (iput) Activatio dela. Dela time of digital iput activatio. COMPRESSOR PROTECTIVE DEVICE (folder with CP label) Ot (4) O time (compressor). Compressor activatio time i the evet of fault probe. If set to with Oft at the compressor is alwas o, while at Oft > it fuctios alwas i dut ccle mode. OFt (4) OFF time (compressor). Compressor i disabled state time i the evet of a fault probe. If set to with Ot at the compressor is alwas off, while at Ot > it fuctios alwas i dut ccle mode. do dela (at) O compressor. Dela time i activatig the compressor rela after switch-o of istrumet dof dela (after power) OFF. Dela after switch off; the idicated time must elapse betwee switch-off of the compressor rela ad the successive switch-o. dbi dela betwee power-o. Dela betwee switch-os; the idicated time must elapse betwee two successive switch-os of the compressor. OdO (!) dela Output (from power) O. Dela time i activatig the outputs after switch-o of the istrumet or after a power failure. DEFROSTING REGULATOR (folder with def label) dt defrost tpe. Tpe of defrostig. = electric defrost; = reverse ccle defrost (hot gas); = Free defrost (compressor hot). dit defrost iterval time. Iterval betwee the start of two successive defrostig operatios. U.M. Hours (default) misec depedig o dt parameter dt defrost time. Measure uit for defrostig itervals ( dit parameter). = dit parameter i hours; = dit parameter i miutes; = dit parameter i secods. dt defrost time. Measure uit for defrostig duratio ( det parameter). = det parameter i hours; = det parameter i miutes; = det parameter i secods. dct defrost Coutig tpe. Selectio of cout mode for the defrostig iterval. = compressor operatig hours (DIGIFROST method); = Real Time appliace operatig time; = compressor stop. doh defrost Offset Hour. Start-of-defrostig dela time from start up of istrumet. det defrost Edurace time. Defrostig time-out; determies duratio of defrostig. U.M. miutes (default) hourssec depedig o dt parameter dst defrost Stop temperature. Defrost stop temperature (defied b the evaporator probe). dpo defrost (at) Power O. Determies if at the start-up the istrumet must eter defrostig (if the temperature measured b the evaporator allows this operatio). = es, starts defrost at start-up; = o, does t start defrost. tcd time compressor for defrost. Miimum time for compressor O or OFF before defrost. If > (positive value) the compressor will be ON for tcd miutes; If< (egative value) the compressor will be OFF for tcd miutes. If = parameter is disregarded Cod Compressor off (before defrost). Time for compressor OFF i proximit of the defrost ccle. If a defrost ccle is set withi the programmed time for this parameter, the compressor is ot started up. FAN REGULATOR (folder with FA label) FPt Fa Parameter tpe. FSt parameter mode. It ca be displaed as temperature absolute value or as value related to Setpoit. = absolute; = relative. FSt Fa Stop temperature. Fa lock temperature; if the value, read b the evaporator probe, is higher tha the set value, fas stop. Fot Fa o-start temperature. Fa startig temperature; if the temperature read b the evaporator is lower tha the value set for this parameter, fas sta still. FAd Fa differetial. Fa startig differetial (see par. FSt ad Fot ). Fdt Fa dela time. Dela time i activatig fas after a defrost operatio. dt draiage time. Drippig time. dfd defrost Fa disable. Allows to select the evaporator probes exclusio durig defrost. = es; = o. FCO Fa Compressor OFF. Allows to select compressor fas lock OFF (switched off). = fas activated (with thermostat; based o the value read b the defrost probe, see parameter FSt ); = fas off; dc = dut ccle (b parameters Fo ad FoF ). Fod Fa off (with opeed) door. Fas activated with opeed door. = es; = o. Allows to select the fas stop whe door is ope, ad the fa re-start whe door will be closed (if the we active). =fas stop; =fas uchaged RANGE...3. LSE..3-55...HSE -3...3....5...5 55...5...5...5...5...5...5...5...59...5-5... 5-3...3 6-5...5. -5...5.. 5....5...5 d.c. DEFAULT. 99. -5. 6 3 8.. -5.. VALUE* LEVEL** U.M. mi mi mi mi mi sec mi mi mi hours (misec) mi mi (hsec) mi mi mi mi IS 974 LX 46
PAR. FdC Fo FoF Att AFd HAL (5) LAL (5) PAO (!) (6) dao OAO tdo tao (6) dat EAL AOP dea (!) FAA (!) LOC PA PA*** dt CA CA CA LdL HdL ddl dro ddd H (!) H H () H (!) H (!) H3 (!) H4 (!) DESCRIPTION Fa dela Compressor off. Fa stop dela time after compressor stop. I miutes. = fuctio excluded Fa off (i dut ccle). Fa OFF time due to dut ccle Fa use with dut ccle mode; valid for FCO = dc ad H4= Fa off (i dut ccle). Fa OFF time due to dut ccle Fa use with dut ccle mode; valid for FCO = dc ad H4= ALARMS (folder with AL label) Alarm tpe. Parameter HAL ad LAL modes, as temperature absolute values or as differetial compared to the Setpoit. = absolute value; = relative value. Alarm Fa differetial. Alarm differetial. Higher ALarm. Maximum temperature alarm. Temperature value (with regard to Setpoit) which if exceeded i a upward directio triggers the activatio of the alarm sigal. Lower ALarm. Miimum temperature alarm. Temperature value (with regard to Setpoit), which if exceeded i a dowward directio, triggers the activatio of the alarm sigal. Power-o Alarm Override. Alarm exclusio time after istrumet switch o, after a power failure. defrost Alarm Override. Alarm exclusio time after defrost. Output (door) Alarm Override. Dela time for temperature alarm sigallig after disablig of digital iput (or gate closure). Alarm is ol for high-low temperature alarms. Time-out Door Ope. Alarm sigallig dela time for gate ope. temperature Alarm Override. Temperature alarm sigal dela time. defrost Alarm time. Alarm for defrost ed due to time-out. = eables alarm; = does ot eable alarm. Exteral Alarm Lock. Exteral alarm for regulators stop. Allows the blockig of compressor, defrostig ad fa regulators if the digital iput (cofigured as exteral alarm) is activated. = ot block; = block. Alarm Output Polarit. Polarit of alarm output. = alarm activated ad output disabled; = alarm activated ad output disabled. COMUNICATION (folder with label Add ) device Address. Device address: idicates the appliace address to the maagemet protocol FAmil Address. Famil address: idicates the appliace famil to the maagemet protocol DISPLAY (folder with dis label) (keboard) LOCk. Keboard lockig. However, ou ca eter parameter programmig modif them alog with the status of this parameter i order to allow keboard lockig. = es; = o PAssword. Whe eabled (value other tha ) it costitutes the access ke for level parameters. PAssword. Whe eabled (value other tha ) it costitutes the access ke for level parameters. umber displa tpe. View with decimal poit. = es; = o CAlibratio.Calibratio. Positive or egative temperature value added to the value read b probe, based o CA parameter settigs. CAlibratio.Calibratio. Positive or egative temperature value added to the value read b probe, based o CA parameter settigs. CAlibratio Itervetio. Itervetio o view offset, thermostat offset or both. = modifies the temperature displaed ol; = adds to the temperature used b regulators, ot to the temperature displaed, which stas uchaged. = adds to the temperature displaed that is also used b regulators. Low displa Label. Miimum value the istrumet is able to displa. High displa Label. Maximum value the istrumet is able to displa. defrost displa Lock. Viewig mode durig defrostig. = shows the temperature read b the thermostat probe; = locks the readig o the temperature value read b thermostat probe whe defrostig starts, ad util the ext time the Setpoit value is reached; = displas the label def durig defrostig, ad util the ext time the Setpoit value is reached. displa read-out. Select C or F for displaig the temperature read b the probe. = C, = F. PLEASE NOTE: the switch betwee C ad F DO NOT modif setpoit, differetial, etc. (for example set= C become F). Selectio of the value tpe to be show o the displa. = Setpoit; = probe ; = probe. CONFIGURATION (folder with CF label) () Probe tpe selectio, PTC or NTC. = PTC; = NTC. Time to eable kes, if these are cofigured for a specific fuctio. Cofigurabilit digital iputspolarit. = disabled; ± = defrostig; ± = reduced set; ± 3 = ot used; ± 4 = door switch; ± 5 = exteral alarm. Cofigurabilit digital output. (OUT ) = disabled; = compressor; = defrostig; 3 = fas; 4 = alarm; 5 = optioal. Cofigurabilit digital output. (OUT 3) Same as H. Cofigurabilit digital output 3. (OUT ) Same as H Cofigurabilit digital output 4. (OUT 4) Same as H RANGE..99..99..99...5. LAL...5. -5...HAL.....999 5...5...4...4...5...55 -... -... -55...3-55...3...5-5...5...5...5...5...5 DEFAULT. 5. -5. -55. 4. 5 3 4 VALUE* LEVEL** U.M. mi mi mi hours mi hours mi mi um um um um um um sec IS 974 LX 56
PAR. H5 (!) (3) H3(!) H3 (!) H33 (!) H4 H4 rel TAb UL dl Fr DESCRIPTION Cofigurabilit buzzer output. Same as H. Cofigurabilit UP ke = disabled; = defrostig; = optioal; 3 = reduced set (ecoom). Cofigurabilit DOWN ke = disabled; = defrostig; = optioal; 3 = reduced set (ecoom). Cofigurabilit FNC ke = disabled; = defrostig; = optioal; 3 = reduced set (ecoom). Regulatig probe preset. Evaporator probe preset. release firmware. Device versio: read ol parameter. table of parameters. Reserved: read ol parameter. COPY CARD (folder with Fpr label) Up load. Programmig parameter trasfer from istrumet to Cop Card. Dow load. Programmig parameter trasfer from Cop Card to istrumet Format. Erasig all data i the cop card. NOTA BENE usig Fr parameter (cop card formattig) the data withi the cop card will be lost permeetl. The operatio caot be cacelled. RANGE...5...3...3...3 DEFAULT 4 VALUE* LEVEL** U.M. um um um () the default value is (NTC iput, see the label o the istrumet). () WARNING! positive or egative values chage polarit; Positive values: active iput for o cotact; egative values: active iput for off cotact. (3) Parameter visible i models with optioal buzzer. (4) Ot e Oft parameters should ever be set = at the same time (5) If alarms are related to the Setpoit, HAL parameter should be set to positive values ad LAL should be set to egative values (6) Referred ol to low ad high temperature alarms * VALUE colum: to be filled mauall, with customized settigs (if differet from the default value). ** LEVEL colum: idicates the level of visibilit of parameters accessible b PASSWORD (see the related paragraph) *** PA is visible (it will be required, if ecessar) at level ad ca be set (editable) at level (!) WARNING! If oe or more of these parameters highlighted with (!) are modified, the cotrolller must be switched off ad switched o agai to esure correct operatio. It is strogl recommeded, awa to switch off ad switch o agai the cotroller atime parameters have bee chaged to prevet malfuctioig o cofiguratio ador ogoig timigs IS 974 LX B to EWEM 43 Module A WIRING IS 974 LX 3-4 Digital iput A TTL iput for Cop Card ad coectio to Televis sstem B coectio IS 974 LX-EWEM 43 3 4 Wirig diagram 3 4 5 6 B to 974 LX module C EWEM 43 WIRING EWEM 43 - output rela 4 (OUT 4) - 3-4 output rela (OUT 3) 5-6 output rela 3 (OUT ) - Power Suppl 6 Probe iput (thermostat) 7 Probe iput (evaporator) 8 commo aalogue (probes) iputs - 4 output rela (OUT ) B coectio IS 974 LX-EWEM 43 C RS-485 suppl (ot used) NOTE: Default user settigs 6 7 8 4 IS 974 LX 66