1/4 compressor modular Chiller-HP for ALCO Driver

Transcription

1 plan application program plan 1/4 compressor modular Chiller-HP for ALCO Driver Manual version: July 22, 2000 Program code: EPSTDEMCHC ef.: 110EM

2 &QWHQWV APPLICATIONS AND FUNCTIONS CAIED OUT BY THE SYSTEM...3 MASTE/SLAVE SYSTEM ACHITECTUE...4 FAST CONFIGUATION...5 WHAT THE ALCO-DIVE MODULA CHILLE IS...5 STEP 1 - PLAN CONFIGUATION...6 STEP 2 - MASK TEE (DIVE MASK LOCALISATION)...7 STEP 3 - DEFAULT VALUE INSTALLATION...8 STEP 4 - DIVE PAAMETE CONFIGUATION...9 STEP 5 - INPUT/OUTPUT DIVE MASKS...12 STEP 6 SYSTEM STATING...13 STEP 7 TYPICAL POBLEMS WHEN STATING THE SYSTEM...13 INPUT/OUTPUT LIST...15 AI/WATE UNIT WITH MAX. 8 SEMIHEMETIC COMPESSOS (1 COMPESSO CAPACITY CONTOLLE)...15 AI/WATE UNIT WITH MAX. 8 SEMIHEMETIC COMPESSOS (UP TO 3 CAP. CONTOLS PE COMP.)...16 AI/WATE UNIT WITH MAX. 8 SEMIHEMETIC COMPESSOS (UP TO 3 CAP. CONTOLS PE COMP.)...17 EGULATION...18 INPUT TEMPEATUE EGULATION...18 OUTPUT TEMPEATUE EGULATION...18 COMPESSOOTATION...19 VALVE PE-POSITIONING MANAGEMENT...20 CONDENSATION EGULATION...21 DEFOSTING EGULATION FO WATE/AI MACHINES...22 ECOVEY UNIT EGULATION...24 FEECOOLING EGULATION UNIT...25 Freecooling regulation with inverter fan management...25 ANTIFEEZE EGULATION...26 ALAMS...27 GENEAL DESCIPTION...27 ALAM HISTOICAL...27 ALAM TABLE...28 DIVE ALAMS...1 PLAN NETWOK...30 I/O card address...30 Terminal address...31 TEMINAL MANAGEMENT...31 Terminal configuration procedure...32 Display of the terminal connection state...33 DIVE SOFTWAE CONFIGUATION...34 Configuration branches...34 USE INTEFACE (DIVE)...34 Password masks...34 Manufacturer parameters...35 CAEL parameters...36 Maintenance parameter...36 Special function: Go Ahead...37 Valve operation according to the Chiller and Head pump modes...37 DIVEEGULATION...38 Capacity parameter request management...38 egulation algorithm...38 SUPEVISOY SYSTEM...39 KEYPAD...43 LIST OF MASKS...45 elease 1.2 July 22, 2000 page 2

3 $SSOLFDWLQV DQG IXQFWLQV FDUULHG XW E\ WKH V\VWHP Type of controlled units air / water only chiller air / water chiller + freecooling air / water total recovery air / water chiller + heat pump Compressor maximum number Max. 1 compressor with max. 3 pco card capacity controls Max. 2 compressors with max. 1 pco card capacity control Compressor type Semihermetic compressors with 1 capacity control Semihermetic compressors with 3 capacity controls Compressor call rotation otation of all the compressors with FIFO logic Electronic expansion valve management (EXV) Management of the EX7 and EX8 Alco valve. Defrosting type Global defrosting of all the pco units connected to the network: Independent/simultaneous/separated. Local defrosting of the single pco unit: separated/ simultaneous Security for each refrigeration circuit High pressure (pressure controller) Low pressure (pressure controller) Oil differential pressure controller Compressor thermal Condensation fan thermal System security A serious alarm input (stops the whole unit), available both in the MASTE and SLAVE unit from the version A flow controller input (stops the whole unit), available both in the MASTE and SLAVE unit from the version A pump thermal input (stops the whole unit) emote on/off input without alarm signalling egulation type Proportional or proportional + integral regulation on the evaporator input probe. Neutral band regulation on the evaporator output probe (compressor insertion according to a band and a time) Condensation The condensation can be carried out according to temperature or pressure The fans can be managed according to ON/OFF mode Or with a 0/10 V modulating signal Accessories Supervision with S422/S485 serial card. Alarm historical with clock card. EVD driver for the EXV valve driving. EVD driver backup EVBAT battery module. elease 1.2 July 22, 2000 page 3

4 0DVWHUVODYH V\VWHP DUFKLWHFWXUH The system is composed of two pcos connected to the local network of which the first acts as master and the second acts as slave. Master function Temperature regulation All compressor call Manages the system alarms Management of max 2 refrigeration circuits (start, stop, alarms, EXV) Communication possibility with an external supervisor Slave function Management of max 2 refrigeration circuits (start, stop, alarms, EXV) for each card Common functions Both master and slave manage (configuration and regulation) max 2 EVD drivers and consequently max 2 EXV valve each. egulation probe The thermoregulation probe will have to connected only to the master pco. Thermoregulation of the whole system EXV 1 EXV 2 EXV 3 EXV 4 pco 1 (Master) pco 2 (Slave) Driver 1 Driver 2 Driver 3 Driver 4 Terminal LCD (4x20) Each pco card, driver card and terminal are identified with an address. The terminal address is selected via the dip-switches situated on the back of the terminals themselves whereas the address in he I/O cards is always selected via dipswitches placed on a card with PCOAD0000 code (without clock option) or PCOCLKMEM0 (with clock option); this card has to be inserted in the clock plug-in connector. The address dip-switches of the EVD driver are on the back of the front-cover (removable) of the driver itself. The master pco must have address 1 The pco slave must have address 2 The driver 1 must have address 3 The driver 2 must have address 4 The driver 3 must have address 5 The driver 4 must have address 6 The local terminal must have address 8 Note : when the unit is ON, all the pco cards and the drivers must be ON (LED On/Off on the terminal ON for all the units). The master unit starts/stops all the units The slave unit starts/stops itself only. If the slave unit is OFF and master is ON, the slave does not starts. If the slave is ON and t master is OFF, the slave does not start. The drivers have no start enabling (are always ON : this does not mean that the driver begins immediately to control because, as long as the pco units do not cause at least one compressor to start, the driver continues to receive a 0% request and consequently the valve is kept closed). elease 1.2 July 22, 2000 page 4

5 )DVW FQILJXUDWLQ This chapter is about the hardware and software minimum configuration to be carried out in order to start the installation. It is recommended to read carefully this chapter because it explains (in short) the main software and hardware characteristics. For further detailed information on the topics discussed in this chapter (prepositioning, plan, etc...) refer to the relevant chapters (see summary). :KDW WKH $/&2GULYHU PGXODU FKLOOHU LV This software permits the management of different chiller types of and of the ALCO driver for ALCO solenoid valve. This software manages 6 different machine types: machine type 0 Æ CHILLE air/water, max. 4 semihermetic compressors, max 1 capacity control per compressor machine type 1 Æ CHILLE with air/water FEECOOLING, max 4 with air/water, max 1 capacity control per compressor machine type 2 Æ CHILLE air/water, max 2 semihermetic compressors, max 3 capacity controls per compressor machine type 3 Æ CHILLE with air/water FEECOOLING, max 2 semihermetic compressors, max 3 capacity controls per compressor machine type 4 Æ CHILLE / HEAT PUMP with air/water, max 2 semihermetic compressors, max 3 capacity controls per compressor machine type 5 Æ CHILLE / HEAT PUMP with air/water TOTAL ECOVEY, max 2 semihermetic compressors, max 3 capacity controls per compressor The integration of the ALCO driver consists of: the opportunity to set all the operation parameters of the drivers present the opportunity to carry out the prepositioning of the valve connected to each driver according to number of compressors ON and the number of the capacity controls the opportunity to monitor all the alarms coming from the driver cards (that can be configured in order to switch off, possibly, the compressors of the relevant circuit) and all the readings of the probes connected to the drivers CAUTION! Any reference to pco1 and pco2 in this manual must be understood as pco card with plan address equal to 1 (pco MASTE card) and pco card with plan address equal to 2 ( pco SLAVE card). elease 1.2 July 22, 2000 page 5

6 6WHS S/$1 FQILJXUDWLQ De-energise both the pco cards and the driver cards if powered. After you have carried out the electrical connections between the pco cards (see the CAEL pco installation manual) and between the pco cards and the drivers (see the CAEL instruction sheet enclosed in the driver card) it is necessary to configure the plan network. To do this, you have to set the dip-switches of the pco addressing cards (card placed at the centre of the pco card, perpendicular to the last one), the dip-switches placed on the back of the terminal/s and the dip-switches present below the driver protection plastic (the block where the LEDs indicating the valve opening/closure, plan, etc.. are located). The removal is not difficult : simply exert a gentle pressure at the sides with your fingers. The maximum configuration includes 2 pco cards, 4 drivers and 4 terminals ; the addresses to be assigned are as follows : pco1 Æaddress 1 pco2 Æ address 2 Driver 1 Æ address 3 Driver 2 Æ address 4 Driver 3 Æ address 5 Driver 4 Æ address 6 Terminal LCD 1 Æ address 7 (shared, both pco1 and pco2) Terminal LCD 2 Æ address 8 (shared, both pco1 and pco2) Terminal LCD 3 Æ address 9 (private, only pco1) Terminal LCD 4 Æ address 10 (private, only pco2) LCD Terminal 1 LCD Terminal 2 LCD Terminal 3 LCD Terminal 4 Address 7 Address 8 Address 9 Address 10 pco1 pco2 Address 1 Address 2 Driver 1 Driver 2 Driver 3 Driver 4 Address 3 Address 4 Address 5 Address 6 Whatever the number and configuration of terminals being utilised, they can be connected indifferently to the pco 1 card or to the pco 2 card (they are anyway present in the plan network) max 3 in number for each pco card. NB : the terminals can not be connected to the driver cards since they do not manage any typo of terminal. The dip-switch configuration provides each terminal with an address so as it can be identified by the plan network. The address, furthermore, establishes the terminal sharing type (private or shared) as shown in the list above. Example 1 : with dip-switch=8, the terminal is considered to be shared between the two cards. In this mode it is possible to utilise the terminal to access the masks of both the pco cards (via the INFO button of the terminal itself). Example 2 : with dip-switch=9, the terminal is considered to be private of the pco1 card. It is namely possible to access only the masks of the pco1 card. elease 1.2 July 22, 2000 page 6

7 6WHS PDVN WUHH GULYHU PDVN OFDOLVDWLQ The following diagram illustrates the configuration branch structure and the driver mask position. The diagram shows the structure with one driver : in the case of two drivers, the driver masks should be simply duplicated. CAUTION! for completeness, also the Carel branch has been reported DO NOT MODIFY ANY PAAMETE INSIDE THE CAEL BANCH WITHOUT PECISE INDICATIONS FOM CAEL O ALCO This diagram is simply a map to better take one s bearings among the configuration and display branches where driver parameters are present. menu + prog Manufacturer Branch/Carel Æ chiller loop mask Æ driver loop mask Enabl./ Driver alarm delays Manufact. branch Password for Manufact. branch Password for Carel branch Carel branch Maintenance branch Password for Maintenance branch Maintenance branch I/O Input/Output branch I/O driver-parameter resumptive masks Hint : by pressing the MENU button inside a driver configuration branch ( manufacturer branch, maintenance branch, carel branch ) you return to the password mask that permits the access to the branch itself. Hint : always refer to this section to better understand where you are and where are the configuration/display parameters which will be examined later on. elease 1.2 July 22, 2000 page 7

8 6WHS 'HIDXOW YDOXH LQVWDOODWLQ After you have verified the connections between the various cards and terminals, energise the pco card/s. At the machine start, the software installs automatically the default values chosen by CAEL for all the chiller and driver configuration parameters. This section explains how to reset the default values to return to the initial conditions. At the first start it is not consequently necessary to execute this operation : jump therefore directly to the step 4. The following procedure is used for resetting all the configuration parameters to the manufacturer values chosen by CAEL. CAUTION! this procedure deletes, irreversibly, the possible programming carried out by the user. Since the default value reset of an operation concerns each pco card, in the case of two cards, it must be repeated for the second one. The procedure is identical for both cards. The necessary steps as follows : press the menu and prog buttons of the LCD terminal simultaneously (once pressed, both the LED placed above the menu button and the one placed above the prog button must light up). Insert the password by utilising the arrow buttons and press enter : in this way you enter the manufacturer configuration branch: M_Pw_Manuf Manufacturer Insert password 0000 Press four times the arrow button up so as to reach immediately the default installation mask : m_manuf_300 eset all parameters to default values N Press the enter button in such a way as to position the cursor above the letter N and using the arrow buttons move it to S ; immediately the writing please wait... appears ; after a few seconds it disappears : at this point the defaults have been completely installed. elease 1.2 July 22, 2000 page 8

9 6WHS GULYHU SDUDPHWHU FQILJXUDWLQ IMPOTANT! Before going on with the ENEGISE AND DEENEGISE the pco card configuration. This section is not intended to explain the meaning of all the driver parameter meaning, but only the fundamental and more interesting ones for the for the driver setting up. For further and more detailed information, see the chapter driver software configuration. Each pco card manages max. two drivers. Since both have the same configuration, this section will illustrate only one. press the menu button to go to the main mask press the INFO button so as to reach the pco unit to be configured : the writing U :01 below left indicates that you are in the pco 1 unit, whereas the writing U :02 indicates that you are in the pco 2 unit M_MainMask 13:10 05/11/00 Inlet Water 14.1 C Outlet Water 13.9 C U:01 OFF FOM KEYB. once you have selected the pco unit to be configured, press the menu and prog buttons simultaneously (as seen previously) and insert the password Scroll the masks by using the down arrow button until you reach the first configuration mask relevant to the driver : m_manuf_50 General plan config Local drivers 1 In this mask, the number of drivers connected to the pco card being configured is set up. Scroll the masks using the down arrow button until the driver alarm configuration masks are reached : m_manuf_244_d1 Driver 1 Alarms Delay on High pressure 0000s Super-heat 0000s m_manuf_244a_d1 Driver 1 Alarms Switch off Drv1 comp if probe error Delay ----sec m_manuf_244c_d1 Driver 1 Alarms Switch off Drv1 comp if eeprom error Delay ----sec m_manuf_244d_d1 Driver 1 Alarms Switch off Drv1 comp if battery error N Delay ----sec elease 1.2 July 22, 2000 page 9

10 m_manuf_244e_d1 Driver 1 Alarms Switch off Drv1 comp if low pressure N Delay ----sec In these masks it is possible to enable and delay the alarms coming from the driver that stop the compressors of the relevant circuit. As you can see from the mask text itself, the only two alarms that do not stop the compressor are high pressure and super-heat. The delay is particularly useful at the unit start because, initially, the system oscillate considerably for several seconds. It is therefore recommended to insert delays according to the machine adaptation rate so as to ignore(at the start) all the alarms that stop the compressors. (Going down with the down arrow button, after the driver 1 masks those of the 2 driver appear if present). Scroll the masks by utilising the down arrow button until you reach the driver configuration masks : There are two configuration masks : manufacturer and Carel. Both of them are accessed via password : m_manuf_pw_c1 Manufacturer D:1 U:1 Insert password 0000 In this section we do not consider the Carel branch because it contains parameters that do not concern the programming. DO NOT MODIFIE ANY PAAMETE IN THE CAEL BANCH IN THE ABSENCE OF PECISE CAEL O ALCO INDICATIONS Before inserting the password, check that the U : u and D : d texts indicate the correct pco card and driver (that are namely those to be configured). U : u Æ U is (pco), whereas u may be 1 or 2, that is pco 1 card and pco 2 card respectively. D : d Æ D is per Driver, whereas d may be 1, 2, 3 or 4, that is driver 1, 2, 3 and 4 respectively. For example : if the mask shows the indication U : 2 D : 3, you are entering the configuration branch of the pco 2 card driver 1 ; since it is possible to connect up to four drivers (two for pco card); those connected to the pco 1 card are considered no.1 and no.2 drivers, whereas those connected to the pco 2 card are considered no.3 and no.4 drivers. This type of indication is found in all the driver configuration and display masks : in this way it is possible to know rapidly which one is the driver and which pco unit it is connected to. Once inserted the password, you enter the manufacturer configuration branch : m_manuf_c1 Manufacturer D:1 U:1 egulation mode EGULATION OFF Present Stages 004 In this first mask, the type of regulation and the number of stages present are set. Initially regulation type is NONE (OFF), i.e. OFF valve (the valve is kept closed in any case). The other available modes are: SELF-ADAPTIVE, TO BE CONFIG.USE and FOCED OPENING described in detail below. Set the type of regulation in SELF-ADAPTATIVE. The number of stages present, on the contrary, depends on the chiller configuration: by stages we mean the number of steps (to be intended as number of compressors + (number of capacity controls per compressor)*number of compressors) of the circuit where the valve is positioned. Example : if you connect a driver to the pco card no.1, chiller configured as machine type no. 2 with 1 compressor and 3 capacity controls, the number of stages being present will be : 1 compressor + (3 capacity controls) * 1 compressor = = 4 stages m_manuf_c1_10 Manufacturer D:1 U:1 Gas type 22 Used valve type EX-7 O LOWE CAP. elease 1.2 July 22, 2000 page 10

11 The successive mask enables you to select the type of gas being utilised the unit and the valve model (EX-6/7/8). NB : LOWE CAP. simply indicates that the regulation can be carried out on the selected valve or on one with lower capacity (this allows you to configure future valves different from those supported at present (that is Ex6, Ex7 and Ex8)). Therefore, set the parameter at : EX-6 or lower cap. Æ if you possess an EX-6 valve EX-7 or lower cap. Æ if you possess an EX-7 valve EX-8 or lower cap. Æ if you possess an EX-8 valve m_manuf_c1_15 Manufacturer D:1 U:1 Comp.capacity 0330KW Super-Heat Setpoint 06.0 K This mask allows you to set the refrigerating capacity of the circuit compressor where the valve is positioned. For example, by selecting the Ex7 valve, the software recommends a 330KW compressor. Leave the superheat setpoint at the default value. Usually this value is right for all the systems : how and why to change it will be discussed below. Skip the successive masks up to the following one : m_manuf_c1_100 Manufacturer D:1 U:1 Pressure probe conf. 4mA -00.8barg 20mA 07.0barg If the default values do not correspond with those of the pressure probe being utilised, modify them by setting the values supplied by the manufacturer. Skip the successive masks until you reach the following one : m_manuf_c1_180 Manufacturer D:3 U: Press.probe 4-20mA Temp.probe type NTC 103-AT (CAEL) If the default values do not agree with those of the pressure and temperature probe being utilised, modify them by setting the values supplied by the manufacturer. The basic driver configuration has come to an end. For further information and explanations on the parameters not being discussed inn this section, refer to the chapter driver software configuration. elease 1.2 July 22, 2000 page 11

12 6WHS LQSXWXWSXW GULYHU PDVNV Before starting the system, it is recommended to know the position of a handy mask displaying the fundamental information coming from the driver which allows you to know in real time : the valve position (expressed in steps ) la super-heat temperature (calculated by the driver) the suction temperature (temperature probe) the suction pressure (pressure probe) m_inout60 D1 valve Pos Super-heat 00.0 C Suction temp C Suct.press. 00.0barg If you utilise two drivers, pay attention to the indication D1 or D2 present above left that indicates respectively the driver1 or the driver2. If you utilise the battery module, it is possible to check the operation state by entering the maintenance branch: press the MANUT button (see keyboard chapter for further information) and, scrolling the masks, the following one is reached : m_maint18 Maintenance D:1 U:1 Battery state DISCONNECTED At the first start, the battery will probably turn out to be DISCHAGED because it takes several hours for recharge (about 48 hours for the first recharge; for further information, see the instruction sheet enclosed in the battery form). The possible states are: DISCONNECTED HIGH INT. ESISTANCE NOT ECHAGEABLE DOWN FUNCTIONING See the chapter driver software configuration for a detailed explanation of the various states. elease 1.2 July 22, 2000 page 12

13 6WHS ² V\VWHP VWDUWLQJ IMPOTANT! Before starting the system ENEGIZE AND DEENEGIZE the pco cards. After you have energised the pco cards, wait until the writing please wait... disappears, then press the ON-OFF button. The green LED of the button will lighten after a few seconds. CAUTION! If two pco cards are being utilised, you have to press the ON-OFF button also in the second card : then move to the second unit by pressing the INFO button and press the ON-OFF button. The complete start of the machine is obtained when the green LED of the ON-OFF button is ON both in the pco 1 unit and in the pco 2 unit and when the pco units report the writing U :01 ON and U :02 ON respectively for the pco 1 and 2 units. 6WHS ² W\SLFDO SUEOHPV ZKHQ VWDUWLQJ WKH V\VWHP Problem : The alarm red LED is ON and the power green LED blinks. Make sure that the driver power is supplied properly as indicated in the instruction sheet enclosed in the driver card. Check that the battery module (if utilised) is connected correctly. Problem : the plan green LED blinks. Make sure that the plan connection is carried out as indicated in the instruction sheet enclosed in the driver card. Make sure that the ili xtx+ and xtx- wires are not reversed. Make sure that dip-switches of the pco cards, of the Driver cards and of the LCD terminals have been set up as explained in the Step 1 - plan configuration. Energise and de-energise first the drivers and then the pco cards (even if the dip-switch selections have not been changed). Problem : the pco shows alarms that can not be deleted or the driver signals alarms whereas the pco signals no alarms At the first start, alarms of the type I wait for valve reopening, I wait for battery recharge, etc.. will be surely signalled; these signals are not real alarms, but warnings, that is signals indicating possible anomaly presence. Actually, it is not a matter of anomalies, but of situations that occurs because the battery is down. To ignore these signals, simply enter the maintenance branch by pressing the MANUT button. First move to the mask m_maint_c1_pw Maintenance D:1 U:1 Insert password 0000 then insert the password, and finally enter the driver maintenance branch. Scroll the masks up to the following one : m_maint_c1_90 WANING! U:1 D:1 System waiting for VALVE EOPENING Ignore? N Besides valve reopening, the mask can signal that the system is waiting for eeprom restart or battery recharge (for further information see the paragraph special function ignore ). Move with the cursor in the field N, set it at S and confirm by pressing enter. After a few seconds the mask ought to change to : m_maint_c1_80 Maintenance U:1 D:1 NO POBLEM If none of the signals ( eeprom restart, battery recharge, etc...) appears, this mask is immediately displayed (obviously, since there is no alarm to be ignored). elease 1.2 July 22, 2000 page 13

14 Press the alarm button repeatedly to see if alarms have been left in queue. To scroll the alarms, use the arrow buttons. Problem : the valve does not open Ensure that other problems discussed in this chapter are absent: in that case solve such problems before going on with reading. There are typical cases that prevent valve opening : the pco cards have not been set at ON the valve regulation has not been set at self-adaptive check type of gas, valve, compressor capacity (KW) and mainly the number of stages present (all these parameters are in the driver manufacturer branch) super-heat alarm broken probe alarm high pressure alarm Caution! The alarm masks show above right the indication of the driver that has generated the alarm and of the pco unit to which it is connected. Afterwards check the driver and the card involved in the alarm. If you do not succeed in starting the unit due to the high/low pressure alarms and/or super-heat, insert some compressor-stop delays in the dedicated masks (see Step 3 - driver parameter configuration ). Furthermore, verify with an instrument that the temperature measurement (it is used to calculate the super-heat) corresponds to the one being measured by the driver temperature probe. Check that the super-heat is at 0 K when the unit is OFF and at ambient temperature. In the driver manufacturer branch it is moreover possible to increase (also at K) the super-heat required in the mask : Manufacturer D:1 U:1 Comp.capacity 0330KW Super-Heat Setpoint 03.0 K in this way the system becomes less sensitive and so is more stable at the inevitable start oscillations. Furthermore, it is possible to extend the working range of the operating pressure by increasing the max. value and reducing the minimo value of the operative pressure in the following mask : m_manuf_c1_70 Manufacturer D:1 U:1 Operating pressure Min. Set 02.0barg Max. Set 08.5barg also in this way the stability of the system is improved. elease 1.2 July 22, 2000 page 14

15 ,QSXWXWSXW OLVW Below the inputs and outputs are listed as a function of the unit type; a number has been associated to each type of machine. This number is the principal parameter of the program as it identifies the input and output configuration. In this way the configuration of the machine is made very easy because you need only choose the requested input and output list and select the associated number in the program configuration masks. Each of the following pages contains 2 unit types and for each unit the pco inputs/outputs from master and the inputs/outputs of one of the slave pcos are described. $,5:$7(5 8QLW ZLWK PD[ VHPLKHUPHWLF FPSUHVVUV FPSUHVVU FDSDFLW\ FQWUOOHU Digital inputs Only Chiller unit MACHINE TYPE 0 Chiller unit with Freecooling MACHINE TYPE 1 n Master Slave no. 1-3 Master Slave no Serious alarm Serious alarm (enabling) Serious alarm Serious alarm (enabling) 2 Evaporator flow controller Evaporator flow controller (enabling) Evaporator flow controller Evaporator flow controller (enabling) 3 emote On/Off emote On/Off 4 Pump thermal Pump thermal 5 Low pressure pressurestat 1 Low pressure pressurestat 3 Low pressure pressurestat 1 Low pressure pressurestat 3 6 Oil differential 1 Oil differential 3 Oil differential 1 Oil differential 3 7 Fan thermal 1 Fan thermal 3 Fan thermal 1 Fan thermal 3 8 Low pressure pressurestat 2 Low pressure pressurestat 4 Low pressure pressurestat 2 Low pressure pressurestat 4 9 Oil differential 2 Oil differential 4 Oil differential 2 Oil differential 4 10 Fan thermal 2 Fan thermal 4 Fan thermal 2 Fan thermal 4 11 High pressure pressurestat 1 / Comp.thermal 1 High pressure pressurestat 3 / Comp.thermal 3 High pressure pressurestat 1 / Comp.thermal 1 High pressure pressurestat 3 / Comp. thermal 3 12 High pressure pressurestat 2 / Comp.thermal 2 High pressure pressurestat 4 / Comp. thermal 4 High pressure pressurestat 2 / Comp. thermal 2 High pressure pressurestat 4 / Comp. thermal 4 Analog inputs Only Chiller unit Chiller unit with Freecooling n Master Slave no. 1-3 Master Slave no Entering water temp. Entering water temp. 2 Leaving water temp. 1 Leaving water temp. 2 Leaving water temp. 1 Leaving water temp. 2 3 Circuit 1 condens. temp. Circuit 3 condens. temp. Circuit 1 condens. temp. Circuit 3 condens. temp. 4 Circuit 2 condens. temp. Circuit 4 condens. temp. Circuit 2 condens. temp. Circuit 4 condens. temp. 5 External Set-Point External temperature 6 Freecooling temperature 7 Circuit 1 high pressure transducers Circuit 3 high pressure transducers Circuit 1 high pressure transducers Circuit 3 high pressure transducers 8 Circuit 2 high pressure transducers Circuit 4 high pressure transducers Circuit 2 high pressure transducers Circuit 4 high pressure transducers Digital outputs Only Chiller unit Chiller unit with Freecooling n Master Slave no. 1-3 Master Slave no Circulation pump Circulation pump 2 Comp.1 winding A Comp. 3 winding A Comp.1 winding A Comp. 3 winding A 3 Comp.1 winding B Comp. 3 winding B Comp.1 winding B Comp.3 winding B 4 Circuit 1 liquid solenoid Circuit 3 liquid solenoid Circuit 1 liquid solenoid Circuit 3 liquid solenoid 5 Comp. 1 capacity control Comp. 3 capacity control Comp. 1 capacity control Comp. 3 capacity control 6 Comp. 2 winding A Comp. 4 winding A Comp. 2 winding A Comp. 4 winding A 7 Comp. 2 winding B Comp. 4 winding B Comp. 2 winding B Comp. 4 winding B 8 Circuit 2 liquid solenoid Circuit 4 liquid solenoid Circuit 2 liquid solenoid Circuit 4 liquid solenoid 9 Comp. 2 capacity control Comp. 4 capacity control Comp. 2 capacity control Comp. 4 capacity control 10 Antifreeze heater 1 Antifreeze heater 2 Circuit 2 condens. Fan Antifreeze heater 2 11 General alarm cumulat. General alarm cumulat. General alarm cumulat. General alarm cumulat. 12 Circuit 1 condens. fan Circuit 3 condens. fan Circuit 1 condens. Fan Circuit 3 condens. fan 13 Circuit 2 condens. fan Circuit 4 condens. fan Freecooling On/Off Circuit 4 condens. fan Analog outputs Only Chiller unit Chiller unit with Freecooling n Master Slave no. 1-3 Master Slave no Condens. 1 fan-speed reg. Condens. 3 fan-speed reg. Condens. 1 fan-speed reg. Condens. 3 fan-speed reg. 2 Condens. 2 fan-speed reg Condens. 4 fan-speed reg Freecooling modulating valve Condens. 4 fan-speed reg elease 1.2 July 22, 2000 page 15

16 $,5:$7(5 XQLW ZLWK PD[ VHPLKHUPHWLF FPSUHVVUV XS W FDS FQWUOV SHU FPS Digital inputs Only Chiller unit MACHINE TYPE 2 Chiller unit with Freecooling MACHINE TYPE 3 n Master Slave no. 1-3 Master Slave no Serious alarm Serious alarm (enabling) Serious alarm Serious alarm (enabling) 2 Evaporator flow controller Evaporator flow controller (enabling) Evaporator flow controller Evaporator flow controller (enabling) 3 emote On/off emote On/off 4 Pump thermal Pump thermal 5 Low pressure pressurestat 1 Low pressure pressurestat 2 Low pressure pressurestat 1 Low pressure pressurestat 2 6 Oil differential 1 Oil differential 2 Oil differential 1 Oil differential 2 7 Circuit 1 fan thermal 1 Circuit 2 fan thermal 1 Circuit 1 fan thermal 1 Circuit 2 fan thermal 1 8 Circuit 1 fan thermal 2 Circuit 2 fan thermal 2 Circuit 1 fan thermal 2 Circuit 2 fan thermal 2 9 Circuit 1 fan thermal 3 Circuit 2 fan thermal 3 Circuit 1 fan thermal 3 Circuit 2 fan thermal High pressure pressurestat 1 High pressure pressurestat 2 High pressure pressurestat 1 High pressure pressurestat 2 12 Comp. 1 thermal Comp. 3 thermal Comp.1 thermal Comp. 3 thermal Analog inputs Only Chiller unit Chiller unit with Freecooling n Master Slave no. 1-3 Master Slave no Entering water temp. Entering water temp. 2 Leaving water temp.1 Leaving water temp.2. Leaving water temp.1. Leaving water temp.2 3 Circuit 1 condens. temp. Circuit 2 condens. temp Circuit 1 condens. temp Circuit 2 condens. temp 4 External temperature 5 External Set-Point External Set-Point 6 Freecooling temperature 7 Circuit 1 high pressure transducers Circuit 2 high pressure transducers Circuit 1 high pressure transducers Circuit 2 high pressure transducers 8 Digital output OnlyChiller unit Chiller unit with Freecooling n Master Slave no. 1-3 Master Slave no Circulation pump. Circulation Pump 2 Comp. 1 winding A Comp. 2 winding A Comp. 1 winding A Comp. 2 winding A 3 Comp. 1 winding B Comp. 2 winding B Comp. 1 winding B Comp. 2 winding B 4 Circuit 1 liquid solenoid Circuit 2 liquid solenoid Circuit 1 liquid solenoid Circuit 2 liquid solenoid 5 Circ. 1 condens. fan 3 Circ. 2 condens. fan 3 Circ. 1 condens. fan 3 Circ. 2 condens. fan 3 6 Comp. 1 capacity control 1 Comp. 2 capacity control 1 Comp. 1 capacity control 1 Comp. 2 capacity control 1 7 Comp. 1 capacity control 2 Comp. 2 capacity control 2 Comp. 1 capacity control 2 Comp. 2 capacity control 2 8 Comp. 1 capacity control 3 Comp. 2 capacity control 3 Comp. 1 capacity control 3 Comp. 2 capacity control 3 9 Circuit 1 condens. fan 2 Circuit 2 condens. fan 2 Circuit 1 condens. fan 2 Circuit 2 condens. fan 2 10 Antifreeze heater 1 Antifreeze heater 2 Antifreeze heater 1 Antifreeze heater 2 11 General alarm cumulat. General alarm cumulat. General alarm cumulat. General alarm cumulat. 12 Circ.1 condens. fan 1 Circ 2 condens. fan 1 Circ.1 condens. Fan 1 Circ.2 condens. fan 1 13 Freecooling On/Off Analog outputs Only Chiller units Chiller unit with Freecooling n Master Slave no. 1-3 Master Slave no Condens.1 fan speed reg. Condens.2 fan speed reg. Condens.1 fan speed reg. Condens.2 fan speed reg. 2 Freecooling modulating valve elease 1.2 July 22, 2000 page 16

17 $,5:$7(5 XQLW ZLWK PD[ VHPLKHUPHWLF FPSUHVVUV XS W FDS FQWUOV SHU FPS Digital inputs Chiller unit with heat pump MACHINE TYPE 4 Chiller unit with total recovery heat pump MACHINE TYPE 5 n Master Slave no. 1-3 Master Slave no Serious alarm Serious alarm (enabling) Serious alarm Serious alarm (enabling) 2 Evaporator flow controller Evaporator flow controller (enabling) Evaporator flow controller Evaporator flow controller (enabling) 3 emote On/Off emote On/Off 4 Summer/winter switch Summer/winter switch 5 Low pressure pressurestat 1 Low pressure pressurestat 2 Low pressure pressurestat 1 Low pressure pressurestat 2 6 Oil differential 1 Oil differential 2 Oil differential 1 Oil differential 2 7 Circuit 1 fan 1 thermal Circuit 2 fan 1 thermal Circuit 1 fan 1 thermal Circuit 2 fan 1 thermal 8 Circuit 1 fan 2 thermal Circuit 2 fan 2 thermal Circuit 1 fan 2 thermal Circuit 2 fan 2 thermal 9 Circuit 1 fan 3 thermal Circuit 2 fan 3 thermal Circuit 1 fan 3 thermal Circuit 2 fan 3 thermal 10 Pump thermal Pump thermal 11 High pressure pressurestat 1 High pressure pressurestat 2 High pressure pressurestat 1 High pressure pressurestat 2 12 Comp. 1 thermal Comp. 2 thermal Comp. 1 thermal Comp. 2 thermal Analog inputs Chiller unit with heat pump Chiller unit with total recovery heat pump n Master Slave no. 1-3 Master Slave no Entering water temp. Entering water temp. 2 Leaving water temp. 1 Leaving water temp. 2 Leaving water temp. 1 Leaving water temp. 2 3 Circ. 1 condens. temp. Circ. 2 condens. temp. Circ. 1 condens. temp. Circ. 2 condens. temp. 4 Input recovery boiler temp. 5 External Set-Point External Set-Point 6 Output recovery boiler temp. 7 Circuit 1 high pressure transducers Circuit 2 high pressure transducers Circuit 1 high pressure transducers Circuit 2 high pressure transducers 8 Digital outputs Chiller unit with heat pump Chiller unit with total recovery heat pump n Master Slave no. 1-3 Master Slave no Circulation pump Circulation pump 2 Comp.1 winding A Comp. 2 winding A Comp.1 winding A Comp. 2 winding A 3 Comp.1 winding B Comp. 2 winding B Comp.1 winding B Comp. 2 winding B 4 Circuit 1 liquid solenoid Circuit. 2 liquid solenoid Circuit 1 liquid solenoid Circuit 2 liquid solenoid 5 Circuit 1 4-way valve Circuit 2 4-way valve Valve A 6 comp.1 cap. control 1 comp.2 cap. control 1 comp.1 cap. control 1 comp. 2 cap. control 1 7 comp.1 cap. control 2 comp.2 cap. control 2 comp.1 cap. control 2 comp. 2 cap. control 2 8 comp.1 cap. control 3 comp.2 cap. control 3 comp.1 cap. control 3 comp. 2 cap. control 3 9 Circ. 1 condens. fan 2 Circ. 2 condens. fan 2 Valve B 10 Antifreeze heater 1 Antifreeze heater 2 Antifreeze heater 1 Antifreeze heater 2 11 General alarm cumulat. General alarm cumulat. General alarm cumulat. General alarm cumulat. 12 Circ. 1 condens. fan 1 Circ. 2 condens. fan 1 Circ. 1 condens. fan 1 Circ. 2 condens. fan 1 13 Circ. 1 condens. fan 3 Circ. 2 condens. fan 3 Valve C Analog outputs Chiller unit with heat pump Chiller unit with total recovery heat pump n Master Slave no. 1-3 Master Slave no Condens 1 fan speed reg. Condens 2 fan speed reg. Condens 1 fan speed reg. Condens 2 fan speed reg. 2 elease 1.2 July 22, 2000 page 17

18 5HJXODWLQ,QSXW WHPSHUDWXUH UHJXODWLQ Utilised inputs Input temperature Utilised outputs All the compressors and their capacity controls Utilised parameters egulation setpoint Input regulation proportional band egulation type (proportional or proportional + integral) Integration time (if the proportional + integral regulation is enabled) Unit type Total compressor number Capacity control number Example : regulation diagram for machines equipped with max 2 semihermetic compressors possessing max three capacity controls setpoint C1 P1 P2 P3 C2 P1 P2 P3 egulation band Temperatura ( C) C1 Æ compressor 1 P1 Æ cap. control 1 P2 Æ cap. control 2 P3 Æ cap. control 3 C2 Æ compressor 2 P1 Æ cap. control 1 P2 Æ cap. control 2 P3 Æ cap. control 3 All the network compressors will be proportionally positioned in the band. 2XWSXW WHPSHUDWXUH UHJXODWLQ Utilised inputs Output temperature Utilised outputs All the compressors and the capacity controls Utilised parameters egulation Setpoint Output regulation neutral band Step activation time Step deactivation time Output temperature minimum limit (stops all the compressors independently of the deactivation time) Output temperature maximum limit (stops all the compressors independently of the deactivation time) elease 1.2 July 22, 2000 page 18

19 As long as temperature remains within the neutral zone, no compressor is activated or deactivated (output temperature included between the point A and the point B) Compressor activation request (output temperature exceeding the point B): Time Point B Output temperature C1 P1-1 P2-1 P3-1 C2 P1-2 P2-2 Delay between different ON Time As long as temperature exceeds the point B the compressors are activated with a delay between one activation and the other equivalent to the parameter delay between neutral zone ON. Deenergization of the energised devices : Time Off compressor minimum limit Point A Output temperature P1-1 P2-1 P3-1 C2 P1-2 P2-2 P3-2 Time OFF-delay at neutral zone As long as the temperature is lower than point A the compressors are deenergized with a delay between one deenergization and the other equal to the delay between neutral band stops parameter. If temperature goes down below the minimum limit the compressors are stopped even in the absence of time fulfilment (this control is introduced to prevent the unit from entering the antifreeze alarm). &PSUHVVU 5WDWLQ The compressor-call rotation causes the hour number and the start-stop number of different compressors to be equivalent. otation is carried out according to a FIFO-type logic; this means that the first compressor to start will be the first to stop. As a consequence of this behaviour, remarkable differences could occur in the initial phase as regards the working hours of the various compressors, but at full working such differences will increasingly attenuate. The rotation only involves the compressors, not the capacity controls. Compressor rotation can be disabled using the appropriate parameter. Management without rotation: Start: C1,C2,C3,C4,C5,C6,...,C16. Stop : C16,C15,C14,C13,C12,C11,...,C1. Management with FIFO rotation (the first compressor to start will be the first to stop): Start: C1,C2,C3,C4,C5,C6,...C16. Stop: C1,C2,C3,C4,C5,...C16. elease 1.2 July 22, 2000 page 19

20 9DOYH SUHSVLWLQLQJ PDQDJHPHQW The EXV regulation algorithm bases itself on the pre-positioning of the valve according to the function of the active compressors. The value of the parameters to be set depends on the selected unit type. Only chiller unit Unit compressor total number pco card (local) compressor number (N) Compressor capacity control number (P) pco card stage number =N*P+N Driver stage number =1/2*(N*P+N) Example : Type of machine no. 0 : 4 circuit chiller unit, 4 compressors with 1 capacity control each. 2 pco cards and 4 drivers (2 driver per pco)are used. You must configure 4 total compressors, 2 local ones, 1 capacity control per compressor and 2 stages per driver. On the pco : Compressor configuration m_manuf_00 Machine type no. 0 Total comp. 4 = compressor total no. in the unit Local comp. 2 = N = no. of compressors per pco card Comp.cap.contr.per 1 = P = no. of stages per per pco card On the Driver #1 : driver 1 configuration m_manuf_c1 Mnufacturer D:1 U:1 Type of regulation NONE (OFF) Stages present 002 = (N*P+N) = no. of stages per driver Similarly proceed as for the configuration of the driver #2 connected to the pco 1 card and of the other two connected to the pco 2 card. Supposing therefore the start of the first full-load compressor and of the capacity-controlled second compressor, 2 stages to the driver 1 and 1 stage to the driver 2 will be respectively forwarded. Chiller unit + heat pump In the EX7 and EX8 valves the flow is unidirectional and so, in case of chiller+ heat pumps, 2 valves are required (and consequently 2 drivers) per circuit. In this case, the number of stages per driver is calculated differently. The system always consists of two driver cards per circuit and the same request is forwarded to both of them because the presence of two valves only serves for permitting the reverse of the cycle. Example: Type of machine no.1 : chiller + heat pump unit with 2 circuits, 4 compressors with 1 capacity control each. 2 pco cards and 4 drivers (2 drivers per pco card) are used. Consequently, 2 drivers per circuit are required. You must configure 4 total compressors, 2 local ones, 1 capacity control per compressor and 4 stages per driver. On the pco : Compressor configuration m_manuf_00 Machine type no. 0 Total comp. 4 = total no. of compressors in the unit Local comp. 2 = N = no. of compressors per pco card Comp. cap. co. per 1 = P = no. of stages per per pco card On the Driver #1 : driver 1 configuration m_manuf_c1 Manufacturer D:1 U:1 Type of regulation NONE (OFF) Stages present 004 = (N*P+N) = no. of stages per driver Similarly proceed as for the configuration of the driver #2 connected to the pco 1 card and the other two connected to the pco card 2. If the first full-load compressor and the second capacity-controlled one are started, the total number of ON stages is 3 (comp.1 + cap. contr.1 + comp.2). Both the drivers of the first circuit will receive a request equal to 3 stages and both of them will activate their respective valve (but obviously only one EXV of the two will act on the refrigerant lamination). elease 1.2 July 22, 2000 page 20

21 &QGHQVDWLQ UHJXODWLQ Condensation can be carried out as follows: on/off bound to the compressor working ( without the pressure transducers) on/off or modulating bound to the reading of the presssure transducer (if the high-pressure transducers have been enabled) on/off or modulating bound to the reading of the battery 1 and 2 temperature probes 1 e 2 (if the battery temperature probes have been enabled) Utilised inputs: high pressure probe C1 B7 high pressure probe C2 B8 battery temperature probe C1 B3 battery temperature probe C2 B4 Utilised outputs: Fan 1 Fan 2 Fan 3 C1 AOUT1 fan speed regulation C2 AOUT2 fan speed regulation Utilised parameters: Condensation control selection: none/pressure/temperature Type of condensation battery (Single / Separated) Condensation Set-Point Condensation Band Number of fans per battery Prevent function enabling Prevent threshold Prevent differential Output voltage relevant to the inverter minimum speed Output voltage relevant to the inverter maximum speed Speed-up time inverter On/off condensation connected to the compressor working: With this type of condensation the fan working will be subordinated solely to the compressor working: Stopped compressor = stopped fan Started compressor = started fan On/off condensation connected to the temperature or pressure sensor: With this type of condensation the fan working will be subordinated solely to the compressor working and to the value read by the pressure or temperature sensors as a function of a set and of a band. When the pressure/temperature will be lower or equal to the set, all the fans will be stopped; when the pressure/temperature increases up to set + band, all the fans will be started. It will be possible to select condensation with single battery or with separated battery; with the single-battery condensation, the fans will be controlled by the higher pressure/temperature; with the separated -battery condensation, each sensor of pressure/temperature controls its own fan. Modulating condensation connected to the pressure or temperature sensor: With this type of condensation the fan control will be carried out through a 0/10 V analog output proportional to the request of the pressure/ temperature sensors. Also in this case it will be possible to select condensation with single battery or with separated batteries. Control will be identical with the above one. If the lower limit of the ramp is greater than 0V, we will not have a proportional straight line but, as in the first part of the graph, one step below the dif. Set-Point. 10 Volt 0 Volt Setpoint 1bar band Prevent Threshold Alarm high pressure batt. temperature elease 1.2 July 22, 2000 page 21

22 'HIUVWLQJ UHJXODWLQ IU ZDWHUDLU PDFKLQHV Utilised inputs: battery 1 temperature (utilizable as pressure control) battery 2 temperature (utilizable as pressure control)) defrosting pressure control 1 input defrosting pressure control 2 input Utilised parameters: Inputs utilised for defrosting Type of global defrosting (simultaneous / separated) Type of local defrosting (simultaneous / separated) set start defrosting set stop defrosting Defrosting delay time Defrosting maximum time compressor switch off time Utilised outputs: Compressor 1 Compressor 2 Compressor 3 Compressor 4 Cycle 1 inversion electrovalve Cycle 2 inversion electrovalve Circuit no. 1 fan Circuit no. 2 fan Defrosting type 1: global simultaneous/ local simultaneous It is sufficient that only one circuit claims to enter the defrosting cycle to force all circuits to defrosting; the circuits that do not require defrosting (temperature higher than defrosting set stop) stop and await; as soon as all circuits stop defrosting, the compressors can start again in heat pump functioning. Defrosting type 2: global separated / local simultaneous With this type of defrosting, a separate defrosting between the different pco units and a simultaneous defrosting inside the same pco unit takes place: The first pco unit that claims defrosting enters defrosting (simultaneous inside the unit); the other units, even if they claim defrosting, they remain awaiting (they keep on operating in heat pump) until the first one stop defrosting; when the first one stops defrosting, the next one requiring defrosting enters it (simultaneous inside the unit) and the others await. Defrosting type 3: global separated / local separated With this defrosting type each refrigeration circuit enters defrosting separately; the first circuit requesting defrosting enters it, the other circuits, even though they claim defrosting, they stay awaiting until the first one stops defrosting; when they first one stops defrosting, the next one that requires defrosting enters it and the others await. Defrost config. Probe TEMPEATUE Global SIMULTANEOUS Local SIMULTANEOUS elease 1.2 July 22, 2000 page 22

23 Defrosting of a circuit with time/temperature control: temperature set.stop set.start t1 t2 t3 Defrosting cycle time If the battery temperature/pressure remains below the defrosting set start for an overall time equal to a defrosting delay time, the circuit involved enters a defrosting cycle: the refrigeration capacity of the system goes to the maximum the refrigeration circuit refrigeration reverses through a 4-way valve the involved fan stops (if the pressure probes are present, the fan will reach a certain threshold in order to prevent the circuit from entering high pressure) The circuit leaves the temperature/pressure defrosting cycle (if the battery temperature exceeds the defrosting set stop) or maximum time defrosting cycle if the defrosting cycle exceeds the maximum time selected. Defrosting of a circuit with time/pressure control: the regulation is exactly the same, except for the fact that the pressure control state is calculated and not the temperature/pressure. elease 1.2 July 22, 2000 page 23

24 5HFYHU\ XQLW UHJXODWLQ Utilised inputs : B1 evaporator entering water t. B2 evaporator leaving water t. ecovery entering water t. ecovery leaving water t. Utilised outputs A valve B valve C valve Utilised parameters ecovery/use priority ecovery Set-Point ecovery band ecovery priority Summer operation: With use thermoregulator not fulfilled and recovery thermoregulator fulfilled, the machine will be working only chiller. The compressors are regulated by the evaporator water temperature. With use thermoregulator not fulfilled and recovery thermoregulator not fulfilled, the machine will be working chiller + recovery. The compressors are regulated by the recovery water temperature With use thermoregulator fulfilled and recovery thermoregulator not fulfilled, the machine will be working only recovery. The compressors are regulated by the recovery water temperature.. Winter working: With use thermoregulator not fulfilled and recovery thermoregulator fulfilled, the machine will be working heat pump. The compressors are regulated by the evaporator water temperature. With use thermoregulator not fulfilled and recovery thermoregulator not fulfilled, the machine will be working only recovery. The compressors are regulated by the recovery water temperature With use thermoregulator fulfilled and recovery thermoregulator not fulfilled, the machine will be working only recovery. The compressors are regulated by the recovery water temperature.. If the unit requests to carry out the defrosting, the machine is working defrosting Use priority: Summer operation: With use thermoregulator not fulfilled and recovery thermoregulator fulfilled, the machine will be working only chiller. The compressors are regulated by the evaporator water temperature. With use thermoregulator not fulfilled and recovery thermoregulator not fulfilled, the machine will be working chiller + reovery. The compressors are regulated by the evaporator water temperature. With use thermoregulator fulfilled and recovery thermoregulator not fulfilled, the machine will be working only recovery. The compressors are regulated by the recovery water temperature. Winter working: With use thermoregulator not fulfilled and recovery thermoregulator fulfilled, the machine will be working heat pump. The compressors are regulated by the evaporator water temperature. With use thermoregulator not fulfilled and recovery thermoregulator not fulfilled, the machine will be working heat pump. The compressors are regulated by the evaporator water temperature With use thermoregulator fulfilled and recovery thermoregulator not fulfilled, the machine will be working only recovery. The compressors are regulated by the recovery water temperature.. If the unit requests to carry out the defrosting, the machine is working defrosting The condensation fans are ON in all working modes excepting chiller + recovery and defrosting. The various working modes are selected by the control though three relays according to the following table Summer working: valve A (recovery) Valve B (use) Valve C (summer/winter) Only chiller OFF ON OFF Chiller + recovery ON ON OFF Only recovery ON OFF OFF Winter working : valve A (recovery) Valve B (use) Valve C (summer/winter) Heat pump OFF ON ON Only recovery ON OFF ON Defrosting OFF OFF ON elease 1.2 July 22, 2000 page 24