Chiller unit SLS-SLH

Transcription

1 Chiller unit SLS-SLH

2 SLS-SLH CHILLER - 2 COMPRESSORS 1 GENERAL INFORMATION 1.1 INTRODUCTION This document contains the information and the operating instructions for SLS-SLH 2 compressors's electronic control. This information is for the after-sales service and the production operators, for the end-of-line testing. 2.1 KEYBOARD & DISPLAY TERMINAL GENERAL INFORMATION The figure shows the terminal with the front door open. It is provided with a LCD 4 lines x 20 columns, keyboard and microprocessor-controlled LED's, so as to allow the programming of the control parameters (setpoint, differential bands, alarm thresholds) and the main operations to be carried out by the user. 1.2 MAIN CHARACTERISTICS Microprocessor control User-friendly keyboard Proportional and integral control of the return water temperature (RWT) Hysteresis control of the leaving water temperature (LWT Access code to enter the Manufacturer's Level Access code to enter the Assistance Level Alarm buzzer and LED backlighted LCD Closed-loop condensing pressure control Pump-Down logic (start-stop) Rotation of the operation of cooling capacity steps Oil return function Night mode (or Low Noise) control Counting of the pump/compressors' hours of operation Display of discharge and suction pressure values History of stored alarms (option) Programming of different setpoints with 4 ranges of time/setpoint. The following accessories can be also connected: Serial Communication RS485 Card; to connect the Chiller Control to a BMS network Remote Display Terminal Wire Remote Control Phase monitor kit 2 CONTROL OF SLS-SLH WITH 2 SCREW COMPRESSORS The SLS-SLH machines with 2 screw compressors are provided with a microprocessor card, which is fully programmed by default for the control of a chiller of cold only type with 2 circuits, 1 compressor per circuit, a HP transducer and a LP transducer per circuit. The control system consists of: TERMINAL & KEY BOARD DESCRIPTION The terminal makes it possible to carry out the following operations: the initial configuration of the machine the change of all the main operating parameters the display of the detected alarms and their acoustic signalling by a buzzer the display of all the measured quantities The terminal and the card are connected by a 6-way phone cable. The connection of the terminal to the basic card is not essential for the normal operation of the controller. 2

3 Access to the display mask of the machine status. Access to the maintenance level mask. Access to the printing mask (not available). 4.Arrow down key: allows you to set the control parameters' values and to move from one mask to another (not backlighted). 5.Enter key: used to move the cursor inside the masks and to save the values of the set parameters. This key is always backlighted (yellow light) to indicate the presence of the power supply. 2.2 DISPLAY Access to the display mask of the status of digital/analog inputs and outputs. Access to the clock mask (if the clock card is available). Access to the display/control setpoint masks. Access to the Service Level masks. Press these keys at the same time to enter the "manufactur-er Level masks of the machine. Displays the information on the software version. The LED's next to each key light up when the relative function is enabled. The display is an LCD 4 lines x 20 columns. The quantities and the information about the operation of the unit are alternated in the form of subsequent screens, named "masks". You can move inside the masks with the terminal keys, as described below x Line0 Home Line1 Line2 Line KEYBOARD ARROWS KEYS - UP/DOWN/ENTER 1.On/off key: allows you to turn the unit on/off. The green LED which lights up the key indicate the status of the unit. 2.Alarm key: used to display the alarms, to reset them in manual mode and to silence the buzzer. If the key lights up (in red), at least an alarm has been identified. Press it one to silence the buzzer and to display the mask of the activated alarm. Press it again to reset the alarm signal. 3.Arrow up key: allows you to set the control parameters' values and to move from one mask to another (not backlighted). If the cursor is in the top left-hand corner (Home), press the UP/DOWN keys to access the subsequent masks associated to the selected branch. If a mask includes some value setting fields and you press the ENTER key, the cursor will reach these fields. Once you have reached the quantity setting field, you can modify any value (within the expected limits) by pressing the UP/DOWN keys. After you have selected the desired value, press the ENTER key again to store it. 3

4 2.3.2 ALARMS Code Alarm description Comp 1 Comp 2 Ventil. #1 Ventil. #2 Pump Aut/Man Delay Notes Status Status Status Status Status Reset AL00 Automatic alarm intervention Run Run Run Run Run Aut NO AL01 Wrong power supply Off Off Off Off Off Man NO Phase monitor (1) AL02 Antifreeze alarm Off Off Off Off Run Man NO AL03 Interlock Off Off Off Off Off Man NO AL04 Flow meter alarm Off Off Off Off Off Man NO AL05 Sys #1 Low pressure - suction Off Run Off Run Run Man 1Time auto AL06 Sys #2 Low pressure - suction Run Off Run Off Run Man 1Time auto AL07 Sys #1 High pressure - delivery Off Run Off Run Run Man NO AL08 Sys #2 High pressure - delivery Run Off Run Off Run Man NO AL09 Thermal switch, compressor 1 Off Run Off Run Run Man NO AL10 Thermal switch, compressor 2 Run Off Run Off Run Man NO AL11 Recovery antifreeze alarm Run Run Run Run Run Man NO AL12 Sys 1 Fans' thermal switch - unit 1 Run Run Off gr.#1 Run Run Man NO AL13 Sys 1 Fans' thermal switch - unit 2 Run Run Off gr.#2 Run Run Man NO AL14 Sys 2 Fans' thermal switch - unit 1 Run Run Run Off gr.#1 Run Man NO AL15 Sys 2 Fans' thermal switch - unit 2 Run Run Run Off gr.#2 Run Man NO AL16 Sys #1 pressure diff. compressor Off Run Off Run Run Man NO AL17 Sys #2 pressure diff. compressor Run Off Run Off Run Man NO AL18 Failure of clock card Run Run Run Run Run Man NO AL19 AL21 B1-Tin Sensor failure Off Off Off Off Run Aut NO note (3) AL22 B2-LP1 Sensor failure Off Run Run Run Run Aut NO note (3) AL23 B3-DP1 Sensor failure Run Run Run Run Run Aut NO note (3) AL24 B4-Tair Sensor failure Run Run Run Run Run Aut NO note (3) AL25 B5-Tout Sensor failure Off Off Off Off Run Aut NO note (3) AL26 B6-LP2 Sensor failure Run Off Run Run Run Aut NO note (3) AL27 7-DP2 Sensor failure Run Run Run Run Run Aut NO note (3) AL28 B8-Tplan Sensor failure Off Off Off Off Run Aut NO note (3) AL29 B9-Trin Sensor failure Run Run Run Run Run Aut NO note (2) (3) AL30 B10-Trout Sensor failure Run Run Run Run Run Aut NO note (2) (3) AL31 Sys #1 compress. maintenance Run Run Run Run Run Aut NO AL32 Sys #2 compress. maintenance Run Run Run Run Run Aut NO AL33 Pump maintenance Off Off Off Off Off Man NO Eprom failure Off Off Off Off Off Man NO AL36 Sys #1 Low pressure - suction Off Run Off Run Run Man 1Time auto AL37 Sys #2 Low pressure - suction Run Off Run Off Run Man 1Time auto Note: 1: check the direction of rotation for power supply and/or minimum voltage phases. Activated only if the Phase Monitor is provided 2: forced return from the recovery mode. Recovery mode disabled. 3: unit alarm on the display Failure of Sensor No. #. SLS-SLH 10/06 4

5 2.3.3 MENU KEY Press the m enu key to display the main mask: RWT... C SYS 1 comp off SYS 2 comp off Unit off MAINTENANCE LEVEL KEY Press the M aintenance key to access the fo low ing m asks : Param eter Type M in.value M ax.value Default N 0000 AL 000 h 00:00 00/00/00 Setpoint 00,0 C Tem perature 00,0 C Pum p h SYS 1 Compressor h SYS 2 Compressor h Insertthe passw ord Offsetprobes T in C -9,9 9,9 0 SP 1 bar -9,9 9,9 0 DP 1 bar -3 9,9 0 T air C -9,9 9,9 0 T out C -9,9 9,9 0 SP 2 bar -9,9 9,9 0 DP 2 bar -9,9 9,9 0 Trin / TC 1 C -9,9 9,9 0 Trout/ TC 2 C -9,9 9,9 0 Mantenence Threshold alarm N(Hoursx1000) Resethours Pum p flag N=NO Y=YES N Compressors SYS 1-SYS 2 flag N=NO Y=YES N Software filter enabled flag N=NO Y=YES Y Thershold C -99,9 99,9 0,5 Range sec Disabile com pressors SYS 1 : N SYS 2 : N 5

6 IF THE STEPS INDICATION IS ZERO, GO TO MAINTENANCE MENU AND TRY TO FORCE MANUALLY THE OPENING OF EEV AS FOLLOW M_PASS_MANUT (MENU PASSWORD MAINTENANCE) m_gohead_drv1 U: Insert password 0000 Right password digit 1234 driver 1 status U: No anomaly N m_manual_drv1 Position : D:1 U: Position EEV : AUTO Required steps : 0000 Actual steps : 0000 circ 1 switch to MAN digit n of steps between 0 and 2167 read the current n of steps m_gohead_drv2 driver 2 status U: No anomaly N m_manual_drv2 Position : D:2 U: Position EEV : AUTO Required steps : 0000 Actual steps : 0000 circ 2 switch to MAN digit n of steps between 0 and 2167 read the current n of steps PRINTING KEY (Not used) I/O (INPUT/OUTPUT) KEY Press the I/O key to access the display masks of the values of all sensors mounted on the machine: Acronym Tin Tout TpLAN SP-1 DP-1 SP-2 DP-2 Tair TRin/TC1 TRout/TC2 IN OUT Inverter group Volt Inverter group Volt MODEM Alarm modem Field : 000% CHILLER CONTROL Codice... Versione. Description Entering water temperature Leaving water temperature Plant regulation sensor in case of Chiller Network Sys 1: suction pressure transducer Sys 1: discharge pressure transducer Sys 2: suction pressure transducer Sys 2: discharge pressure transducer Room air temperature Entering water temperature recovery Leaving water temperature recovery Status of the Chiller Control's digital inputs Status of the Chiller Control's digital outputs 6 SLS-SLH 10/06

7 FIRST OF ALL CHECK IF THE DRIVER OF EEV IS WORKING OR NOT AS FOLLOW THE BELOW MASKS ARE AVAILABLE UNDER THE ALARM MENU M_STORICI (MENU ALARMS HISTORY) U : : Nß0000 AL000 00:00 00/00/00 Setpoint : 00.0ßC Temperature : 00.0ßC M_STORICI_DRV1 (MENU ALARMS DRIVER 1) U : Storico driver 1 SH Steps.0000 Temp 00.0 Press 00.0 (??) (POSITION AND TERMODINAMIC PARAMETER FROZEN WHEN THE ALARM HAPPENED ON CIRCUIT 1) POSIZIONE E GRANDEZZE TERMODINAMICHE CONGELATE AL MOMENTO DELL ALLARME MEMORIZZATO, CIRCUITO 1 M_STORICI_DRV2 (MENU ALARMS DRIVER 2) U : Storico driver 2 SH Steps.0000 Temp 00.0 Press 00.0 (??) (POSITION AND TERMODINAMIC PARAMETER FROZEN WHEN THE ALARM HAPPENED ON CIRCUIT 2) POSIZIONE E GRANDEZZE TERMODINAMICHE CONGELATE AL MOMENTO DELL ALLARME MEMORIZZATO, CIRCUITO CLOCK KEY You can access the following masks: User parameters Control mode Min. Value Max. Value Default Clock Hour 00:00 24:00 Day Monday Sunday Date Daily Time zone with variation of the setpoint N=NO Y=YES N If Daily zone Y you can to enter in the follow mask Setp1 = :00h Setp2 = :00h Setp3 = :00h Setp4 = :59h 7 SLS-SLH 10/06

8 2.3.8 USER LEVEL - SETPOINT KEY Press the Set key to enter the Setpoint level, which can be accessed by the user. The parameters that can be set are listed below, together with the limit values and the default values (standard shop set-up. User parameters Control mode Min. Value Max. Value Default Sys #1 ON/OFF OFF ON OFF Sys #2 ON/OFF OFF ON OFF Cooling Setpoint Inlet mcs Outlet mcs 20 8 Heating Setpoint Inlet 20 MHS-2 43 Outlet 20 MHS 45 Glycole Setpoint Inlet Outlet Proportional Band Inlet Neutral Band Outlet Language selection ITA ENG FRA GER SPA ITA Recovery SYS #2 ON/OFF OFF ON OFF SYS #1 ON/OFF OFF ON OFF Recovery Setpoint Recovery Band Recovery Where mcs = min. cold limit for the setpoint (see Service level) Where MHS = max. heat limit for the setpoint (see Service level) When the machine is turned on, every single circuit is activated through the SYSTEM # ON/OFF parameters (SET key). At this level you can select the language of opera-tion (English, Italian, French,German,Spanish) SERVICE LEVEL KEY Press the Prog key (correct password 1234) to access the Service Level: Parameters Type Min. Value Max. Value Default R134A unit On/off remote enabled Flag N=NO Y=YES N Cool/heat remote enabled Flag N=NO Y=YES N Press the key ENTER for default values Pressing the ENTER key initializes the control: all the Manufacturer Level/Service Level parameters are forced to the default value. Auto restart After blackout Flag N=NO Y=YES N Glycole enabled Flag N=NO Y=YES N Clock 32 Kbyte Flag N=NO Y=YES N Night management Flag N=NO Y=YES N Night management Flag N=NO Y=YES Y DPOFFSET bar

9 Parameters Type Min. Value Max. Value Default TMAX C TMIN C DELTA-V Volt Cool setpoint 2 Return mcs Outlet mcs Heat setpoint 2 Return 20 mhs-2 40 Outlet 20 mhs 42 HEAT SET comp. Flag N=NO Y=YES N Set -point C Diff. C Max. C COOL SET comp. Flag N=NO Y=YES N Set -point C Diff. C Max. C Serial Card Flag N=NO Y=YES N GSM modem Flag N=NO Y=YES N ChillerNet Flag N=NO Y=YES N Water temperature RWT - P Flag Type control RWT P+I LWT RWT P RWT P+I Sec Min.time on compressor Sec Min.time off compressor Sec Loading time compressor Sec Unloading time compressor Sec Min.cooling setpoint (mcs) C Max. heating setpoint (MHS) C Pump management Remote logic Flag N=NO Y=YES N Stand-by hour h Delay OFF Sec Minimum time between pump/compressor Sec Pump down Enable Flag N=NO Y=YES Y Maximum time Sec Set SP bar Condensation STD: STEP type control Flag STEP FSC LAK: FSC (note 1) Delay start fans Sec LS (low speed) only if STEP Set-point C Diff.. C R134A unit 9

10 Parameters Type Min. Value Max. Value Default R134A unit LS (low speed) only if STEP HP1 bar LP1 bar DPSET (only if FSC) bar MINDP (only if FSC) bar MIN Speed (only if FSC) Vdc MAX Speed (only if FSC) Vdc Condensation (cool) MDP bar High bar Diff. bar Condensation (heat) Low C High C Min LWT Limit C Diff. C Max LWT Limit C Diff. C Interlock enabled Flag N=NO Y=YES N Phase control alarm enabled Flag N=NO Y=YES N Delay time flowswitch alarm LOP Delay LOP alarm Diff pressure Antifreeze Antifreeze heater Recovery antifreeze Recovery antifreeze heater Digital input DI 15/16 Function Unload running start -up Sec Se - point bar (1 x SLH) Diff. bar running Sec start -up Sec Alarm enabled Flag N=NO Y=YES Y Delay rating Sec Set - point bar Diff. bar Limit C Diff. C Set-point C Diff. C Limit C Diff. C Set-point C Diff. C

11 Parameters Type Min. Value Max. Value Default Defrost mangement SP Start bar TC Stop C Charge time Sec Start time Min Max time Min Off reversing Sec Tair off (off in heating) C Min. Tair (load discharge in heating) C Insert the new service password 1234 R134A unit Note 2: Set this parameter to FSC only if the speed controller is available, otherwise set it to STEP. SETTING OF EEV, EX7 or EX8 type, for YSLS R134a SERVICE LEVEL 1234 GO INTO THE SERVICE LEVEL (PROG ) SCROLL THE MASKS DOWN TO THE NEXT M_PASS_DRIVER U : Insert password driver m_manuf_drv1_1 Parameters D:1 U: Valve type ALCO EX7 o EX8 m_manuf_drv1_2 Parameters D:1 U: Percentage ratio circuit/eev...40% Note: This is the ratio between the max. cooling capacity of the refrigerant circuit controlled by the valve and the max. cooling capacity of the valve at 100% opening EX8 with R134A range fron 70 to 680 kw. 11 SLS-SLH 10/06

12 m_manuf_drv2_1 Parametri D:2 U: Tipo valvola ALCO EX7 o EX8 Presenza batteria...s m_manuf_drv2_2 Parametri D:2 U: Rapporto percentuale circuito/eev...40% m_manuf_d1_ch1 Parameters-CH : D:1 U: SHeat setp : 06.0 C SH Dead band :.0.0 C leave the value at 0, only if the circuit come unstable go to 1.0 C but absolutely not over > 1 C m_manuf_d2_ch1 Parametri-CH : D:2 U: SHeat setp : 06.0 C SH Banda morta :.0.0 C IF THE CONTROL PANEL IS SHOWING A LOW PRESSURE ALARM FOLLOW THE NEXT PROCEDURE... m_manuf_d1_ch2 Parameters-CH D:1 U: Prop. gain Int. time s Deriv time s increase this value if the SH is not controlled 15sec with plate heat exchanger m_manuf_d2_ch2 Parameters-CH D:2 U: Prop. gain Int. time s Deriv time s increase this value if the SH is not controlled 15sec with plate heat exchanger m_manuf_d1_ch3 Parameters-CH D:1 U: SH protection low SH low C Int. time s normal range between 2 & 4 C normal range between 1 & 10. If 0 the protection must be unable 12 SLS-SLH 10/06

13 m_manuf_d2_ch3 Parametri-CH D:2 U: Protezione basso SH Basso SH C Tempo int s follow same indications as before m_manuf_drv_ch1 Param. COMM-CH U: LOP protection LOP threshold C Int. time s if LOW PRESSURE ALARM ON, change this values m_manuf_drv_ch2 Param. COMM-CH U: MOP threshold C Int. time s Delay start up s if 0 than unable the protection m_manuf_drv_ch3 Param. COMM-CH U: High TCond. protection TCond. threshold 60.0 C Int. time s m_manuf_drv_ch4 Param. COMM-CH U: High temp. threshold suction C m_manuf_drv_1 Parameters COMM U: Refrigerant... R134a m_manuf_drv_7 Parameters COMM U: Evap. pressure probe Min. threshold bar Max. threshold bar m_manuf_drv_8 Parameters COMM U: Alarms delay SHeat low s T. suct. high s alarm unable alarm unable 13 SLS-SLH 10/06

14 m_manuf_drv_9 Parameters COMM U: Alarms delay LOP s MOP s alarm unable alarm unable NOTE ABOUT ALARM DELAY: if the value is 0 sec than unable the alarm, if during the test there is MOP or T.asp alarm -> than unable the alarms. NEW_DRV U: Insert new password driver MANUFACTURER LEVEL KEY Press the menu + prog keys at the same time, under a valid access code (4939), to enter the Manufacturer Level. The parameters are available only in Italian. User parameters Type Min. Value Max. Value Default Enter password Manifactured Exact password Enable sensor B1:Y B2:Y B3:Y B4:Y B5:Y B6:Y B7: Y B8:N B9:N B10:N (See note) Transducer Suction pressure SLS-SLH 10/06 B8 = N For standard B8 = Y For master unit ( Note ) B9 = N For chiller B9 = Y For heat pump B10 = N For chiller B10 = Y For heat pump 4 ma Range , ma Range ,9 7.0 Transducer Discharge pressure 4 ma Range , ma Range , Unit SLS: Chiller Flag Chiller Heat pump SLH: Heat pump Abil.black box Flag N=NO Y=YES N Number of compressor per circuit N Driver TXV N Rotation Flag Y N Y Parzializzazioni Numero N Type Flag modulante step step Max auto-reset in each hour Low pressure 1 N Low pressure 2 N High pressure 1 N High pressure 2 N

15 User parameters Type Min. Value Max. Value Default SYS 1 Overload protection Fan motor 1 N Fan motor 2 N SYS 2 Overload protection Thermal compressor N SYS 1 N SYS 2 N Tempo di Part-winding ms Gradino 1 (25%) Logica relè 1 flag N=NO Y=YES Y Logica relè 2 flag N=NO Y=YES N Logica relè 3 flag N=NO Y=YES N Gradino 2 (50%) Logica relè 1 flag N=NO Y=YES N Logica relè 2 flag N=NO Y=YES Y Logica relè 3 flag N=NO Y=YES N Gradino 3 (75%) Logica relè 1 flag N=NO Y=YES N Logica relè 2 flag N=NO Y=YES N Logica relè 3 flag N=NO Y=YES Y Gradino 4 (100%) Logica relè 1 flag N=NO Y=YES N Logica relè 2 flag N=NO Y=YES N Logica relè 3 flag N=NO Y=YES N Tempo min.funz. 3a parz. (25%) sec Tempo max funz. 2a parz. (50%) sec Gestione particolare 3a parz.(25%) flag N=NO Y=YES Y Abilitazione allarme pressostato differenziale olio flag N=NO Y=YES N Push the ENTER key Warning to initialize the unit Carry out this operation whenever download new software Insert new costructor password

16 3 COMPRESSORS LEAVING LIQUID CONTROL (COOLING MODE) If Leaving Control mode is selected, the leaving mixed water temperature LWT will be controlled between the setpoint and the setpoint + Neutral Band. The SetPoint High Limit is the Setpoint plus the Neutral Band. The SetPoint Low Limit is the Setpoint. If the mixed leaving water temperature LWT is above the SetPoint High Limit, the compressors will be energized one by one separated by the Time between Start and Start different compressors. If the LWT falls below the SetPoint High Limit and greater than the SetPoint Low Limit, temp is in the Neutral Band. No actions is occurring. No load and no unloading. If the LWT falls below the SetPoint one compressor is switched off. Until the LWT is below the Setpoint, compressors are unloaded according to the Unload time parameter value. 4 COMPRESSORS LEAVING LIQUID CONTROL (HEATING MODE) If leaving Control mode is selected, the leaving mixed water temperature LWT will be controlled between the setpoint and the setpoint - Neutral Band. The SetPoint High Limit is the Setpoint. The SetPoint Low Limit is the Setpoint Neutral Band. If the mixed leaving water temperature LWT is below the SetPoint Low Limit, the compressors will be energized one by one separated by the Time between Start and Start different compressors. If the LWT is between the SetPoint Low Limit and the SetPoint High Limit, temp is in the Neutral Band. No actions is occurring. No load and no unloading. If the LWT is above the SetPoint High Limit one compressor is switched off. Until the LWT is above the Setpoint High Limit, compressors are unloaded according to the Unload time parameter value. 16

17 5 COMPRESSORS RETURN LIQUID CONTROL (COOLING MODE) If Return Control Mode is selected, the return water temperature RWT is controlled between the Setpoint and the Setpoint + Proportional Band. We call this zone: the Loading Zone. All stages, are placed in the proportional band, dividing it in the number of the stages. If the RWT is above the Sepoint, control starts to load each stages. The higher is the RWT, the more stages will be loaded, according to the compressor activity logic, timer and rules described. For each stages will be respected the minimum time ON the minimum time OFF and loading time. Charge sequenzer: compressore 1 25% compressore 1 50% compressore 2 25% compressore 2 50% compressore 1 75% compressore 2 75% compressore 1 100% compressore 2 100% 6 COMPRESSORS RETURN LIQUID CONTROL (HEATING MODE) The compressors are loaded in the same proportional way used in Return Control in Cooling. The difference is that the loading zone is between Set Point Proportional Band and Set Point. 17

18 7 CONDENSER FAN CONTROL (IN COOLING MODE WITH FAN SPEED CONTROL) Parameter used: Minimum Fan Speed, Max Fan Speed, Discharge Pressure Set (DPSET), Max Discharge Pressure, MINDP, Condensation type Control (STEP or FSC) Control uses one digital output to power on one fans relay and an analogue output 0-10Vdc to drive a Fan Speed Controller (FSC). The fans try to maintain a constant condenser pressure equal to the programmed set point by varying fan speed. As soon as the first compressor starts, the fan relay will turn on, and it will stay on until the all compressors turn off. For the first 10 seconds the fans will begin at an output level proportional to the ambient temperature. The hotter it is out, the faster the fans will start. Below is a chart showing the correlation. Table 1 Startup Fan Values There is one high pressure transducer each system. If only one compressor is running, the fans control to its discharge pressure. If two compressors are running, the fans control the pressure of the 1st system started, or the one which is running at 100% capacity if the other one is running at lower capacity as long as neither pressure exceeds the maximum discharge pressure. Once on, the fan speed is recalculated every second according to the below basic rules: If DPSET-1 < DP < DPSET+1 then no change in AO If (DPSET+1 < DP < DPSET+2) AND (DP IS NOT DECREASING) then AO = AO + 1 % If (DP > DPSET + 2) AND (DP IS NOT DECREASING) then AO = AO + 5 % If (DPSET-2 < DP < DPSET-1) AND (DP IS NOT INCREASING) then AO = AO -1% If (DPSET-2 < DP < 10.5) AND (DP IS NOT INCREASING) then AO = AO -2% If (DP < MINDP) then AO = AO - 2 % To check if DP is increasing or decreasing, value qdp = ± 0.2 bar/sec is used. 18

19 8 CONDENSER FAN CONTROL (COOLING MODE) IN STEP The fan step control is managed by the parameters LP1-HP1-LS-Diff The fans start under sensor air (B4) control OAT During the fans running : If DP>HP1 one step is load independent by OAT value If DP<LP1 unloaded the step DP is the leader between the two transducer LS - Default = 0 C DIFF - Default = 30 C HP1 - Default = 21 bar (R407C) 14 bar LP1 - Default = 11 bar (R407C) 7 bar (R134A) (R134A) 19

20 9 CONDENSER FAN CONTROL IN HEATING WITH FSC Two parameters used: Low Air Temp Heating and High Air Temp Heating. If the Tair probe is installed, fan control in heat pump mode is always based on ambient temperature and not pressure. At unit startup, the fans will run for 3 seconds at max speed before the compressor starts. After startup, the fans will run according to the following rule: If Tair < Low Air Temp Heating then AO = Max Fan Speed If Low Air Temp Cooling < Tair < High Air Temp Cooling then AO from Max to Min with linear progression If Tair > High Air Temp Heating then AO = Min Fan Speed If Air Temp Probe (B4) isn t installed, the Analogue Output is forced to the 10Vdc value. The Fan relay is energized whenever at least one compressor is running. If High pressure transducer are installed, during the defrost cycle, the fans will turn on at 20Bar and run at 50%. AO = 5Vdc. The fans will stay on until the higher discharge pressure drops to 15 Bar, and then they will turn off. 20

21 10 CONDENSER FAN CONTROL (HEATING MODE) IN STEP LOW Default = 15 C HIGH Default = 30 C 21

22 11 NIGHT MANAGEMENT (or LOW NOISE OPTION) The parameter is defined at the Service level: Night Mode. If set to SI, the DPSET is modified as follows: DPSET night=dpset+dpoffset from PM hours to AM hours Where:DPOFFSET = parameter in bars at Service Level. It is the correction of the pressure target of the condensation control with speed controller. PM and AM = parameters that ca be set with a mask with the CLOCK key, if enabled: PM = night mode start AM = night mode end MAX FAN SPEED IN COOLING IN NIGHT MODE: MaxFanSpeed is no longer a fixed parameter, but is a function of B4, air temperature The analogue output value AO, is always between the Min Fan Speed and the Max Fan Speed. Whenever one of the two high pressure measures by the transducer reaches the MDP Value, soon the fan must run at max speed, until that high pressure value falls again to the 90% of the Max High Pressure Value. 12 COMPRESSORS CAPACITY CONTROL Parameters used: Disch Pressure Limit, (HI) Max Disch Pressure.(MDP). If high pressure transducer are installed and if the unit is a 2 compressors unit, the compressors capacity control is active. If, at any time while the compressor is full loaded the high pressure value reaches the setted Disch Pressure Limit default value 24.5 bar, the compressor loaded is soon unloaded. The compressor loaded of the system will be allowed to run only when High Pressure value falls below the Max Discharge Pressure default value 23.5 bar. 22

23 13 OIL RECOVERY FUNCTION If one of the compressor (circuit 1-2) running at 50% more than 40 the control will force the the compressor (circuit 1-2) at 100% for 5 minuts. 14 PUMP CONTROL Parameters used in Pump management mask: Remote logic, Stand-by, Delay Stop. Pump always starts 30 seconds before the first compressor is loaded and stops always a parameter Pump Delay Time value in seconds after the unit is stopped locally or by remote start/stop digital input. If the parameter Pump Remote Logic is in YES, if the unit is stopped by the remote Start/Stop digital input, the pump continues to run. It only stops if the unit is locally stopped by panel. When the unit is in Off, always pump runs for 5 mins every Pump Stand-by Interval value, setted in Service Level. Default must be 12 hours. If the pump is not controlled by the electronic control put the stand by value at 00. If the unit is in stand-by, the pump must anyway be started if the Antifreeze heater is powered or the unit is in Antifreeze alarm. 15 PUMP-DOWN LOGIC LIQUID LINE SOLENOID VALVE CONTROL Pump Down during start-up of the first compressor of each system and during stop of the last compressor of each system. Parameters used: Pump-Down Max Time, Pump-Down Enable, Liquid Line Solenoid Valve Enable. All the following logic is valid only if Liquid Line Valve are selected as present in Factory Level, and if Pump-Down is enable in Service Level. Each system is equipped with one liquid line solenoid valve, to feature a pumping down. Pump-down finishes by low pressure, when Low Pressure Switch opens and/or by maximum time reached. See the mask and graphs below for further information. 16 DEFROST CYCLE (HEAT PUMPS ONLY) Defrosting of a circuit with time/temperature control: 23

24 It is a Simultaneous Global Defrost. Parameters used: Defrost start Temp; Defrost stop temp, defrost Delay time, defrost Max time, Reversing Off Time. It is possible to set compressor switch off time (Reversing Off parameter) when system enter and exit from defrost mode. Compressors are not switched off if time is set to 0 seconds. Moreover cycle reversion during normal operation (changing from summer to winter mode or back) always follow compressors switch off. If one of the two Tcoil probes temperature values fall below the Defrost start Temp, a timer starts. The timer is increased while the Tcoil value is under the Defrost start Temp. When the timer (t1 + t2 + t3 + ) reaches the defrost start time value, the defrost cycle starts for both system. During defrost cycle, fans are stopped, all compressors run (if one or more are in off, they must be powered), reverse valve is powered. During defrost cycle, if the discharge pressure in one of the two systems, reaches an high dangerous value, fans must run at max speed. So, if discharge pressure transducer are attached, if one of the two high pressure values reaches the Max Discharge Pressure value (see MDP) the fans contactor is energized and the analogue output is forced to 5Vdc. If High Pressure Transducer are not attached, in HeatPump there will be a High Pressure Switch each system, connected to the J1-1 and J1-3. If during defrost, one of these pressure switch contact closes, the fans will run at max speed. Defrost cycle stops when the Tcoil value rises up to the Defrost Stop Temp value, anyway if the Defrost Max Time has elapsed. When defrost cycle is ended, the reverse valve is unpowered and fans are powered again, according to fans rule logic. 17 SLS-SLH TROUBLE SHOOTING The following table details possible unit faults, their probable cause and suggested remedies, for any other problems not immediately recognisable and/or technical assistance, call an authorised Technical Service Center. Faulty Probable cause Remedy AL00 See the alarm Autoreset Automatic alarm intervention AL01 Wrong compressors rotation To check the electrical connection Wrong power supply AL02 Low water flow To check the pump Antifreezing Wrong pump To check the pump size Water filter dirty To clean the filter Dirty exchanger To clean the exchanger High circuit pressure drop To check the plant pressure drop AL03 External interlock contact open To check the electrical connection Interlock To check the interlock external contact AL04 Water pump stop To check the pump Luck of flow Water pump blocked To release the pump Pump thermal contact open To reset the thermal contact and to check the scale Flow switch blocked To release the flow switch AL05 Espansion valve broken To replace the espansion valve Sys 1 Gas circuit empty To charge the circuit Low pressure Gas leak To find and repair the leak High temperature water inlet To check the plant thermal load Solenoid valve not open To check the electrical connection Solenoid valve not open To check Pump Down setting AL06 Espansion valve broken To replace the espansion valve Sys 2 Gas circuit empty To charge the circuit Low pressure Gas leak To find and repair the leak High temperature water inlet To check the plant thermal load Solenoid valve not open To check the electrical connection Solenoid valve not open To check Pump Down setting SLS-SLH 10/06 24

25 Faulty Probable cause Remedy AL07 Sys 1 High pressure AL08 Sys 2 High pressure AL09 Thermal switch compressor 1 AL10 Thermal switch compressor 2 AL11 Recovery antifreezing AL12 Thermal switch fans group 1 SYS 1 COOL Fan stop Low ventilation Fan thermal contact open High gas charge Coil dirty Coil obstruct Faulty high pressure transducer HEAT Low water flow Wrong pump Dirty filter Dirty exchanger High circuit pressure drop COOL Fan stop Low ventilation Fan thermal contact open High gas charge Coil dirty Coil obstruct Faulty high pressure transducer HEAT Low water flow Wrong pump Dirty filter Dirty exchanger High circuit pressure drop Motor compressor faulty Compressor thermal contact open Wrong charge Wrong electrical cable connection & phase missing Motor compressor faulty Compressor thermal contact open Wrong charge Wrong electrical cable connection & phase missing Low water flow Wrong pump Water filter dirty Dirty exchanger High circuit pressure drop Fan stop Fan thermal contact open Fan blocked Wrong electrical cable connection & phase missing To check the fan To check the fan speed To reset the contact To check the gas charge To clean the coil To check the installation position To replace the transducer To check the pump To check the pump size To clean the filter To clean the exchanger To check the plant pressure drop To check the fan To check the fan speed To reset the contact To check the gas charge To clean the coil To check the installation position To replace the transducer To check the pump To check the pump size To clean the filter To clean the exchanger To check the plant pressure drop To check the compressor motor To reset the thermal contact To check the gas charge To check the electrical connection, to tighten the terminal block screws To check the compressor motor To reset the thermal contact To check the gas charge To check the electrical connection, to tighten the terminal block screws To check the pump To check the pump size To clean the filter To clean the exchanger To check the plant pressure drop To check the motor To reset the thermal contact and to check the scale To release the fan To check the electrical connection, to tighten the terminal block screws 25

26 Faulty Probable cause Remedy AL13 Thermal switch fans group 2 SYS 1 AL14 Thermal switch fans group 1 SYS 2 AL15 Thermal switch fans group 2 SYS 2 AL16 Pressure diff compressor SYS 1 AL17 Pressure diff compressor SYS 2 AL18 Failure of clock card AL21 Failure sensor B1 Entering water temperature AL22 Failure sensor B2 LP 1 Transducer Low pressure Circuit 1 AL23 Failure sensor B3 DP 1 Transducer High pressure Circuit 1 AL24 Failure sensor B4 Outdoor air temperature AL25 Failure sensor B 5 Outlet water temperature Fan stop Fan thermal contact open Fan blocked Wrong electrical cable connection & phase missing Fan stop Fan thermal contact open Fan blocked Wrong electrical cable connection & phase missing Fan stop Fan thermal contact open Fan blocked Wrong electrical cable connection & phase missing No pressure variation Faulty high pressure transducer Faulty low pressure transducer No pressure variation Faulty high pressure transducer Faulty low pressure transducer Clock faulty Faulty sensor Cut cable Sensor not connected Water inside the sensor Faulty transducer Cut cable Transducer not connected Water inside the transducer Faulty transducer Cut cable Transducer not connected Water inside the transducer Faulty sensor Cut cable Sensor not connected Water inside the sensor Faulty sensor Cut cable Sensor not connected Water inside the sensor To check the motor To reset the thermal contact and to check the scale To release the fan To check the electrical connection, to tighten the terminal block screws To check the motor To reset the thermal contact and to check the scale To release the fan To check the electrical connection, to tighten the terminal block screws To check the motor To reset the thermal contact and to check the scale To release the fan To check the electrical connection, to tighten the terminal block screws To check the gas charge To replace the transducer To replace the transducer To check the gas charge To replace the transducer To replace the transducer To replace the clock To replace the sensor To replace cable To check the electrical connection To check the insulation To replace the transducer To replace cable To check the electrical connection To check the insulation To replace the transducer To replace cable To check the electrical connection To check the insulation To replace the sensor To replace cable To check the electrical connection To check the insulation To replace the sensor To replace cable To check the electrical connection To check the insulation 26

27 Faulty Probable cause Remedy AL00 See the alarm Autoreset Automatic alarm intervention AL26 Faulty transducer To replace the sensor Failure sensor B 6 Cut cable To replace cable LP 2 Transducer not connected To check the electrical connection Transducer Water inside the transducer To check the insulation Low pressure Circuit 2 AL27 Faulty transducer To replace the sensor Failure sensor B 7 Cut cable To replace cable DP 2 Transducer not connected To check the electrical connection Transducer Water inside the transducer To check the insulation High pressure Circuit 2 AL01 Wrong compressors rotation To check the electrical connection Wrong power supply AL28 High pressure transducer damaged To replace the transducer Failure sensor B 8 Cut cable To check the cable T plan Water inside the transducer To check the insulation Connector loose To tighten the connector screws AL29 Faulty sensor To replace the sensor Failure sensor B 9 Cut cable To replace cable Tr inlet Sensor not connected To check the electrical connection Water inside the sensor To check the insulation AL30 Faulty sensor To replace the sensor Failure sensor B 10 Cut cable To replace cable Tr outlet Sensor not connected To check the electrical connection Water inside the sensor To check the insulation AL31 Exceeded hours of operation compressor 1 To do maintenance Compressor 1 Maintenance AL32 Exceeded hours of operation compressor 2 To do maintenance Compressor 2 Maintenance AL33 Exceeded hours of operation pump To do maintenance Pump Maintenance Eprom failure To replace the eprom AL36 Espansion valve broken To replace the espansion valve Sys 1 Gas circuit empty To charge the circuit Low pressure Gas leak To find and repair the leak High temperature water inlet To check the plant thermal load Solenoid valve not open To check the electrical connection Solenoid valve not open To check Pump Down setting AL37 Espansion valve broken To replace the espansion valve Sys 2 Gas circuit empty To charge the circuit Low pressure Gas leak To find and repair the leak High temperature water inlet To check the plant thermal load Solenoid valve not open To check the electrical connection Solenoid valve not open To check Pump Down setting 27 SLS-SLH 10/06

28 18 LIST OF ITELCO-CLIMA APPLICATION SUPERVISOR VARIABLES FOR PCO2 APPLICATION CHILLER tyìe RLS or SLS or SLH Level: 1=User (Site manager); 2=Service Manager; 3=Manufacturer; n.c.=not care Valid for software from release CWFLICIICH0A May 2003 Index Meaning Read/Write Level Range 1 Water inlet temperature (RWT) Read C 2 Water outlet temperature (LWT) Read C 4 External air temperature (OAT) Read C 5 System #1 low pressure transducer Read bar 6 System #2 low pressure transducer Read bar 7 System #1 high pressure transducer Read bar 8 System #2 high pressure transducer Read bar 9 System #1 defrost temp. Read C 10 System #2 defrost temp. Read C 11 Regulated temperature (RWT or LWT) Read C 12 Sys 1 Fan speed index Read Sys 2 Fan speed index Read Discharge pressure setpoint Read/Write bar 26 Max fan speed Read/Write Vdc 27 Maximum Discharge pressure Read/Write bar 28 Discharge pressure limit Read/Write bar 35 Antifreeze setpoint Read/Write C 59 RWT cooling setpoint Read/Write C 60 LWT cooling setpoint Read/Write C 61 RWT glycol cool setpoint Read/Write C 62 LWT glycol cool setpoint Read/Write C 63 Neutral zone Read/Write C 64 Proportional Band Read/Write C 84 RWT heating setpoint Read/Write C 85 LWT heating setpoint Read/Write C 28

29 Index Meaning Read/Write Level bit = 0 bit = 1 1 System #1 compressor #1 Read 2 off On 6 Pump Read 1 not run Run 7 Unit alarm Read 1 run Alarm 8 System #2 compressor #1 Read 2 off On 13 Fan 1 sys 1 Read 2 off On 14 Fan 2 sys 1 Read 2 off On 15 Fan 1 sys 2 Read 2 off On 16 Fan 2 sys 2 Read 2 off On 20 Automatic restart Read/Write 2 no Yes 21 Enable operation with glycol Read/Write 2 no Yes 28 Chiller / Heatpump Read 1 Cool only Heatpump unit 25 Enable night mode Read/Write 2 off on 31 On/Off from supervisor Read/Write 1 off on 38 Unit on Read 1 off on 41 Disable system #1 Read/Write 1 off on 42 Disable system #2 Read/Write 1 off on 53 B1 faulty probe Read 2 no alarm yes alarm 54 B2 faulty probe Read 2 no alarm yes alarm 55 B3 faulty probe Read 2 no alarm yes alarm 56 B4 faulty probe Read 2 no alarm yes alarm 57 B5 faulty probe Read 2 no alarm yes alarm 58 B6 faulty probe Read 2 no alarm yes alarm 59 B7 faulty probe Read 2 no alarm yes alarm 60 B8 faulty probe Read 2 no alarm yes alarm 61 B9 faulty probe Read 2 no alarm yes alarm 62 B10 faulty probe Read 2 no alarm yes alarm 63 Compressor #1 maintenance Read 2 no maint. yes maint. 64 Compressor #2 maintenance Read 2 no maint. yes maint. 67 Fan overload 1 sys 1 Read 2 no alarm yes alarm 68 Fan overload 2 sys 1 Read 2 no alarm yes alarm 69 Fan overload 1 sys 2 Read 2 no alarm yes alarm 70 Fan overload 2 sys 2 Read 2 no alarm yes alarm 71 Compressor #1 overload Read 2 no alarm yes alarm 72 Compressor #2 overload Read 2 no alarm yes alarm 73 System #1 high pressure Read 2 no alarm yes alarm 74 System #2 high pressure Read 2 no alarm yes alarm 75 System #2 low pressure Read 2 no alarm yes alarm 76 System #1 low pressure Read 2 no alarm yes alarm 77 Flow switch alarm Read 2 no alarm yes alarm 79 Antifreeze alarm Read 2 no alarm yes alarm 80 Phase monitor alarm Read 2 no alarm yes alarm 83 4-way valve Read 2 off On 84 Cool Heat (1 = Cool; 0 = Heat) Read/Write 1 Heating Cooling 85 Heating operation Read 1 Cool Heat 29

30 Index Meaning Read/Write Level gsegna 1 System #1 state Read 1 0 = Off System #1 state 1 = Pumpdown System #1 state 2 = Comp run System #1 state 3 = Sys alarm 2 System #2 state Read 1 as per sys 1 3 Unit state Read 1 0 = on Unit state 1 = off by alarm Unit state 2 = off by supervisor Unit state 3 = off by low OAT Unit state 4 = off by remote Unit state 5 = off 7 RWT/LWT temperature control Read/Write 2 0= RWT 13 Pump stand-by time Read/Write hr 14 Pump power off delay Read/Write sec 15 Pump down max time Read/Write sec 25 Night mode start hour (PM) Read/Write Night mode start minutes Read/Write Night mode end hour (AM) Read/Write Night mode end minutes Read/Write