INSTALLATION AND OPERATION MANUAL

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ADJUSTMENT <strong>AND</strong> CONTROLProbe characteristicsNTC10K-25°C type temperature probes are used.When the probe bulb is at a temperature of 25°C the electrical resistance measurable at the probe ends with a multimeter isapprox. 10 kΩ. The thermistor of these probes has a negative temperature coefficient: the electrical resistance value decreasesas the temperature increases.To find out if a temperature probe is faulty or disconnected, check the correspondence between the resistance value in kΩ andthe bulb temperature in °C according to the following table.Temperature[°C]Resistance[kΩ]Temperature[°C]Resistance[kΩ]Temperature[°C]Resistance[kΩ]0 25.7950 20 12.2110 40 5.78051 24.8483 21 11.7628 41 5.56832 23.9363 22 11.3311 42 5.36403 23.0578 23 10.9152 43 5.16714 22.2115 24 10.5146 44 4.97745 21.3963 25 10.1287 45 4.79486 20.6110 26 9.7569 46 4.61887 19.8546 27 9.3988 47 4.44938 19.1259 28 9.0539 48 4.28609 18.4239 29 8.7216 49 4.128710 17.7477 30 8.4015 50 3.977111 17.0963 31 8.0931 51 3.831212 16.4689 32 7.7961 52 3.690613 15.8644 33 7.5100 53 3.555114 15.2822 34 7.2343 54 3.424615 14.7213 35 6.9688 55 3.298916 14.1810 36 6.7131 56 3.177917 13.6605 37 6.4667 57 3.061218 13.1592 38 6.2293 58 2.948919 12.6762 39 6.0007 59 2.8406For a reliable check it is not necessary to control each single value, but just several sample values. If the instrument gives aninfinite resistance, this means the probe is disconnected.Example. With a temperature of 20°C on the probe, the ohmmeter display will indicate approx. 12.21 kΩTester set in ohms withadequate full scaleRoomtemperature20°CProbe inquestion64
ADJUSTMENT <strong>AND</strong> CONTROLSerial communicationThe unit can communicate on serial line using the Modbus communication protocol with RTU coding.The unit can be connected to an RS485 network by means of the serial interface supplied as an accessory, and respond torequests from any master device connected to the network.Serial line settingsThe serial line must be set as follows :• baud rate : 9600• data bits : 8• stop bits : 1• parity : evenAll the devices connected to the same serial line MUST use the same settings.Device addressTo communicate correctly, each device connected to the serial network must have an univocal address (“Modbus individualaddress”) of between 1 and 247. This address can be set by modifying the parameter CF63.Modbus commandsThe Modbus commands implemented by the controller are :• parameter reading 3 (Hex 03 : Read Holding Registers)• parameter writing 16 (Hex 10 : Write Multiple Registers)Table of addressesAll the available resources are stored in the controller as WORD (2 byte) and therefore require the reading or writing of an entireModbus register. According to the Modbus protocol, to identify a register of address X the address X-1 must appear in themessage.Some registers contain more than one piece of information : in this case the bits representing the resource value are identifiedby means of the number of bits used (“Bit number”) and by the least significant bit (“Lsb”). In the writing operation for these registersit is necessary to read the current register value, modify the bits representing the resource concerned and rewrite the entireregister.Example.Bit number = 4Lsb = 7Resource value = 315 14 13 12 11 10 9 8 7 6 5 4 3 2 1 00 1 1 0 1 0 0 1 1 1 0 1 1 0 1 0The resources can be read only (R), write only (W) or read and write (RW).To interpret the value written in the register it is necessary to consider the value of CPL, EXP and UM :CPL : if the register represents a number with sign (CPL = Y) carry out the following conversion :0 = register value < 32767 : resource value = register value32768 = register value < 65535 : resource value = register value – 65536EXP :MU :indicates the exponent of the power of 10 to be multiplied by the register value to obtain the resource value.EXPMultiplier-2 10 -2 0.01-1 10 -1 0.10 10 0 11 10 1 102 10 2 100indicates the unit of measure of the resourceIMPORTANT. DO NOT modify any parameter not indicated in the tables provided or indicated as a read only parameter (R),otherwise the warranty will be cancelled.65
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RGCAIR COOLED WATER CHILLERS AND HE
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TABLE OF CONTENTSTHIS MANUAL IS DIV
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GENERAL SPECIFICATIONSPresentation
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GENERAL SPECIFICATIONS71625433. Com
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GENERAL SPECIFICATIONSVersion with
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ACCESSORIES AND OPTIONAL EQUIPMENTK
Page 13 and 14: ACCESSORIES AND OPTIONAL EQUIPMENTA
Page 15 and 16: TECHNICAL SPECIFICATIONS AND STANDA
Page 25 and 26: NOISE LEVELSThe noise levels refer
Page 27 and 28: WATER PRESSURE DROP PLATE HEAT EXCH
Page 29 and 30: WORKING HEAD OF THE PUMPING MODULE
Page 31 and 32: MAXIMUM VOLUME OF WATERMaximum volu
Page 33 and 34: DIMENSIONAL DATAOverall dimensionsM
Page 35 and 36: DIMENSIONAL DATAConfigurations for
Page 37 and 38: WITHOUTWATER STORAGE TANKWITHWATER
Page 43 and 44: RECEPTION AND POSITIONINGInspection
Page 45 and 46: ELECTRICAL CONNECTIONSSpecification
Page 47 and 48: WET CONNECTIONSGeneral rulesA mesh
Page 49 and 50: WET CONNECTIONSBasic diagram for un
Page 51 and 52: WET CONNECTIONSRefrigerant flow dia
Page 53 and 54: ADJUSTMENT AND CONTROLControl syste
Page 55 and 56: ADJUSTMENT AND CONTROLMenu structur
Page 57 and 58: ADJUSTMENT AND CONTROLMenu Access p
Page 59 and 60: ADJUSTMENT AND CONTROLDESCRIPTIONCH
Page 61 and 62: ADJUSTMENT AND CONTROLTable of alar
Page 63: ADJUSTMENT AND CONTROLConfigurable
Page 67 and 68: SETTING AT WORKGeneral RulesTo vali
Page 69 and 70: SAFETY AND POLLUTIONGeneral conside
Page 71 and 72: SAFETY AND POLLUTION13 CONSIDERATIO
Page 73 and 74: NOTE
Page 75 and 76: NOTE
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INSTALLATION AND OPERATION MANUAL

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