Itelco Industry SLS-SLH User manual

Chiller unit
SLS-SLH

2
SLS/SLH 10/06
SLS-SLH CHILLER - 2 COMPRESSORS
1 GENERAL INFORMATION
1.1 INTRODUCTION
This document contains the information and the operat-
ing instructions for SLS-SLH 2 compressors's electronic
control.
This information is for the after-sales service and the pro-
duction operators, for the end-of-line testing.
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 opera-
tion
– 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 pro-
grammed 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:
2.1 KEYBOARD & DISPLAY TERMINAL
2.1.1 GENERAL INFORMATION
The figure shows the terminal with the front door open.
It is provided with a LCD 4 lines x 20 columns, key-
board and microprocessor-controlled LED's, so as to
allow the programming of the control parameters (set-
point, differential bands, alarm thresholds) and the main
operations to be carried out by the user.
2.1.2 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.

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SLS/SLH 10/06
Access to the “display mask” of the machine
status.
Access to the “maintenance level mask”.
Access to the “printing mask” (not available).
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 ver-
sion.
The LED's next to each key light up when the relative
function is enabled.
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 identi-
fied.
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 parame-
ters' values and to move from one mask to another
(not backlighted).
4.Arrow down key: allows you to set the control para-
meters' 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
The display is an LCD 4 lines x 20 columns. The quanti-
ties 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.
2.3 KEYBOARD
2.3.1 ARROWS KEYS - UP/DOWN/ENTER
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.
x Line0
Home Line1
Line2
Line3
+--------------------+
+--------------------+

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SLS-SLH 10/06
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 O O O O O Man NO
Phase monitor (1)
AL02 Anti reeze alarm O O O O Run Man NO
AL03 Interlock O O O O O Man NO
AL04 Flow meter alarm O O O O O Man NO
AL05 Sys #1 Low pressure - suction O Run O Run Run Man
1Time auto
AL06 Sys #2 Low pressure - suction Run O Run O Run Man 1Time auto
AL07 Sys #1 High pressure - delivery O Run O Run Run Man NO
AL08 Sys #2 High pressure - delivery Run O Run O Run Man NO
AL09 Thermal switch, compressor 1 O Run O Run Run Man NO
AL10 Thermal switch, compressor 2 Run O Run O Run Man NO
AL11 Recovery anti reeze alarm Run Run Run Run Run Man NO
AL12 Sys 1 Fans' thermal switch - unit 1 Run Run O gr.#1 Run Run Man NO
AL13 Sys 1 Fans' thermal switch - unit 2 Run Run
O gr.#2 Run Run Man NO
AL14 Sys 2 Fans' thermal switch - unit 1 Run Run Run O gr.#1 Run Man NO
AL15 Sys 2 Fans' thermal switch - unit 2 Run Run Run O gr.#2 Run Man NO
AL16 Sys #1 pressure di . compressor O Run O Run Run Man NO
AL17 Sys #2 pressure di . compressor Run O Run O Run Man NO
AL18 Failure o clock card Run Run Run Run Run Man NO
AL19
AL21 B1-Tin Sensor ailure O O O O Run Aut NO note (3)
AL22 B2-LP1 Sensor ailure O Run Run Run Run Aut NO note (3)
AL23 B3-DP1 Sensor ailure Run Run Run Run Run Aut NO note (3)
AL24 B4-Tair Sensor ailure Run Run Run Run Run Aut NO note (3)
AL25 B5-Tout Sensor ailure O O O O Run Aut NO note (3)
AL26 B6-LP2 Sensor ailure Run O Run Run Run Aut NO note (3)
AL27 7-DP2 Sensor ailure Run Run Run Run Run Aut NO note (3)
AL28 B8-Tplan Sensor ailure O O O O Run Aut NO note (3)
AL29 B9-Trin Sensor ailure Run Run Run Run Run Aut NO note (2) (3)
AL30 B10-Trout Sensor ailure 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 O O O O O Man NO
-------- Eprom ailure O O O O O Man NO
AL36 Sys #1 Low pressure - suction O Run O Run Run Man 1Time auto
AL37 Sys #2 Low pressure - suction Run O Run O Run Man
1Time auto
Note:
1: check the direction o rotation or power supply and/or minimum voltage phases. Activated only i the Phase Monitor is
provided
2: orced return rom the recovery mode. Recovery mode disabled.
3: unit alarm on the display “Failure o Sensor No. #”.

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SLS/SLH 10/06
2.3.3 MENU KEY
Pre ss the “m enu” key to disp lay the main mask:
RWT................................. °C
SYS 1 comp off
SYS 2 comp off
Unit off
2.3.4 MAINTENANCE LEVEL KEY
Pre ss the “M a intenance” key to access the follow ing m a sks :
Param eter Type M in.Value M ax.Value Default
N°0000
AL000 h 00:00 00/00/00
Setpoint 00,0 °C
Tem p erature 00,0 ° C
Pum p 000000 h
SYS 1
Compressor 000000 h
SYS 2
Compressor 000000 h
Insertthe p a ssw ord
0000 1234
Offse t probes
T in°C-9,99,90
SP 1 bar -9,99,90
DP 1 bar -39,90
T air°C-9,99,90
T out °C -9,99,90
SP 2 bar -9,99,90
DP 2 bar -9,99,90
Trin / TC 1°C-9,99,90
Trout/ TC 2°C-9,99,90
Mantenence
Threshold alarmN(Hoursx1000) 0 1000 10
Resethours
Pum p flag N=NO Y=YES N
Compre sso rs
SYS 1-SYS 2flag N=NO Y=YES N
Softwarefilter enabled flag N=NO Y=YES Y
Thersh o ld°C -99,9 99,90,5
Range sec 0 999 10
Disabile co m p re sso rs
SYS 1 : N SYS 2 : N

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SLS-SLH 10/06
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_manual_drv1
m_manual_drv2
digit
1234
U:
Insert password
0000
Right password
circ 1
switch to MAN
digit n° o steps between 0 and 2167
read the current n° o steps
Position : D:1 U:
Position EEV : AUTO
Required steps : 0000
Actual steps : 0000
circ 2
switch to MAN
digit n° o steps between 0 and 2167
read the current n° o steps
Position : D:2 U:
Position EEV : AUTO
Required steps : 0000
Actual steps : 0000
m_gohead_drv1
m_gohead_drv2
driver 1 status U:
No anomaly
N
driver 2 status U:
No anomaly
N
2.3.5 PRINTING KEY
(Not used)
2.3.6 I/O (INPUT/OUTPUT) KEY
Press the I/O key to access the display masks o the values o all sensors mounted on the machine:
Acronym Description
Tin Entering water temperature
Tout Leaving water temperature
TpLAN Plant regulation sensor in case o “Chiller Network”
SP-1 Sys 1: suction pressure transducer
DP-1 Sys 1: discharge pressure transducer
SP-2 Sys 2: suction pressure transducer
DP-2 Sys 2: discharge pressure transducer
Tair Room air temperature
TRin/TC1 Entering water temperature recovery
TRout/TC2 Leaving water temperature recovery
IN Status o the Chiller Control's digital inputs
OUT Status o the Chiller Control's digital outputs
Inverter group 1
00.0 Volt
Inverter group 2
00.0 Volt
MODEM
Alarm modem
Field : 000%
CHILLER CONTROL
Codice …….…..
Versione ……….

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SLS-SLH 10/06
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)
M_STORICI_DRV1 (MENU ALARMS DRIVER 1)
M_STORICI_DRV2 (MENU ALARMS DRIVER 2)
U : : Nß0000
AL000 00:00 00/00/00
Setpoint : 00.0ßC
Temperature : 00.0ßC
(POSITION AND TERMODINAMIC PARAMETER FROZEN
WHEN THE ALARM HAPPENED ON CIRCUIT 1)
POSIZIONE E GRANDEZZE TERMODINAMICHE CONGELATE
AL MOMENTO DELL’ALLARME MEMORIZZATO, CIRCUITO 1
U : Storico driver 1
SH.. 00.0 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 2
U : Storico driver 2
SH.. 00.0 Steps.0000
Temp 00.0 Press 00.0
(??)
2.3.7 LO K KEY
You can access the ollowing masks:
Clock
Hour 00:00 24:00
Day Monday Sunday
Date 01.01.00 31.12.00
Daily
Time zone with variation o the setpoint N=NO Y=YES N
If Daily zone Y you can to enter
in the follow mask
Setp1 = 00.0 - 00:00h
Setp2 = 00.0 - 00:00h
Setp3 = 00.0 - 00:00h
Setp4 = 00.0 - 23:59h
User parameters Control mode Min. Value Max. Value Default

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SLS/SLH 10/06
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
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+2 20 10
Outlet mCS 20 8
Heating Setpoint Inlet 20 MHS-2 43
Outlet 20 MHS 45
Glycole Setpoint Inlet –15 20 10
Outlet –15 20 8
Proportional Band Inlet 1 10 5
Neutral Band Outlet 1 6 2
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 30 50 45
Band Recovery 2 6 4
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).
2.3.9 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
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 0 8 2
are listed below, together with the limit values and the
default values (standard shop set-up.
At this level you can select the language of opera-tion
(English, Italian, French,German,Spanish)
Pressing the ENTER key initializes the control: all the Manufacturer
Level/Service Level parameters are forced to the default value.

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SLS/SLH 10/06
Parameters Type Min. Value Max. Value Default R134A
unit
TMAX °C -20 50 30
TMIN °C -20 50 +5
DELTA-V Volt 0.0 5.0 5.0
Cool setpoint 2 Return mCS+2 20 14
Outlet mCS 20 12
Heat setpoint 2 Return 20 mHS-2 40
Outlet 20 mHS 42
HEAT SET comp. Flag N=NO Y=YES N
Set -point °C -999.9 999.9 5.0
Diff. °C -999.9 999.9 -005.0
Max. °C -999.9 999.9 -005.0
COOL SET comp. Flag N=NO Y=YES N
Set -point °C -999.9 999.9 24.0
Diff. °C -999.9 999.9 10.0
Max. °C -999.9 999.9 -002.0
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
Type control Flag RWT P+I LWT RWT P
RWT P+I Sec 0 999 600
Min.time on
compressor Sec 0 999 300
Min.time off
compressor Sec 0 999 300
Loading time
compressor Sec 0 999 20
Unloading time
compressor Sec 0 999 15
Min.cooling
setpoint (mCS) °C -10 9.9 6
Max. heating
setpoint (MHS) °C 20 55 50
Pump management Remote logic Flag N=NO Y=YES N
Stand-by hour 1 24 00h
Delay OFF Sec 0 60 20
Minimum time between pump/compressor Sec 0 60 30
Pump down Enable Flag N=NO Y=YES Y
Maximum time Sec 5 90 15
Set SP bar 0.2 3 1.8
Condensation
type control Flag STEP FSC STD: STEP
(note 1) LAK: FSC
Delay start
fans Sec -10 10 00
LS (low speed) only if STEP Set-point °C -20 00 00
Diff.. °C 0 99 30

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SLS/SLH 10/06
Parameters Type Min. Value Max. Value Default R134A
unit
LS (low speed) only if STEP HP1 bar 0 28 21 14
LP1 bar 0 16 11 7
DPSET (only if FSC) bar 10 24 16 10
MINDP (only if FSC) bar 1 25 11 6
MIN Speed (only if FSC) Vdc 0 10 0
MAX Speed (only if FSC) Vdc 0 10 10
Condensation (cool) MDP bar 0 28 23.5 15
High bar 0 28 24.5 18
Diff. bar 0 3 1
Condensation (heat) Low °C 0 99 15 15
High °C 0 99 30 18
Min LWT Limit °C -20 20 5.0
Diff. °C 0.5 3 1.5
Max LWT Limit °C 20 55 47
Diff. °C 0.5 10 3
Interlock enabled Flag N=NO Y=YES N
Phase control alarm enabled Flag N=NO Y=YES N
Delay time flowswitch alarm running 1 20 1
start -up Sec 1 20 5
LOP Se - point bar 0 3 1.8 (1 x SLH)
Diff. bar 0 3 1
Delay LOP alarm running Sec 0 120 45
start -up Sec 0 120 60
Diff pressure Alarm enabled Flag N=NO Y=YES Y
Delay rating Sec 0 120 60
Set - point bar 2 10 6
Diff. bar 2 10 0
Antifreeze Limit °C -15 10 4
Diff. °C 0 99 2
Antifreeze heater Set-point °C -15 10 5
Diff. °C 0 99 2
Recovery antifreeze Limit °C -15 10 3
Diff. °C 0 99 2
Recovery antifreeze heater Set-point °C -15 10 5
Diff. °C 0 99 2
Digital input
DI 15/16
Function Unload

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SLS-SLH 10/06
Defrost mangement
SP Start bar 0 30 2.8
TC Stop °C -20 30 10
Charge time Sec 0 99 20
Start time Min 0 99 45
Max time Min 1 10 5
O reversing Sec 0 999 0
Tair off (off in heating) °C -20 20 -20
Min. Tair (load discharge in heating) °C -20 20 -10
Insert the new service password 1234
Parameters Type Min. Value Max. Value Default 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 + 1234)
SCROLL THE MASKS DOWN TO THE NEXT 
M_PASS_DRIVER
m_manu _drv1_1
m_manu _drv1_2
Note: This is the ratio between the max. cooling capacity o the re rigerant circuit controlled by the valve and the max.
cooling capacity o the valve at 100% opening EX8 with R134A range ron 70 to 680 kW.
1234
U :
Insert password
driver.................... 0000
Parameters D:1 U:
Valve type
ALCO EX7 o EX8
Parameters D:1 U:
Percentage ratio
circuit/EEV................40%

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SLS-SLH 10/06
m_manu _drv2_1
m_manu _drv2_2
m_manu _d1_ch1
m_manu _d2_ch1
leave the value at 0, only i the circuit come unstable go to 1.0 °C but
absolutely not over > 1°C
Parametri D:2 U:
Tipo valvola
ALCO EX7 o EX8
Presenza batteria.........S
Parametri D:2 U:
Rapporto percentuale
circuito/EEV.............40%
Parameters-CH : D:1 U:
SHeat setp : 06.0°C
SH Dead band : .0.0°C
Parametri-CH : D:2 U:
SHeat setp : 06.0°C
SH Banda morta : .0.0°C
m_manu _d1_ch2
m_manu _d2_ch2
m_manu _d1_ch3
increase this value if the SH is not controlled
15sec with plate heat exchanger
normal range between 2 & 4 °C
normal range between 1 & 10. I 0 the protection must be unable
Parameters-CH D:1 U:
Prop. gain ........ 050
Int. time ............ 030s
Deriv time ......... 002s
Parameters-CH D:2 U:
Prop. gain ........ 050
Int. time ............ 030s
Deriv time ......... 002s
Parameters-CH D:1 U:
SH protection low
SH low ............ 03.0°C
Int. time ............ 002s
IF THE CONTROL PANEL IS SHOWING A LOW PRESSURE ALARM FOLLOW THE NEXT PROCEDURE ...
increase this value if the SH is not controlled
15sec with plate heat exchanger

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SLS-SLH 10/06
m_manu _d2_ch3
m_manu _drv_ch1
m_manu _drv_ch2
m_manu _drv_ch3
m_manu _drv_ch4
m_manu _drv_1
m_manu _drv_7
m_manu _drv_8
ollow same indications as be ore
i LOW PRESSURE ALARM ON, change this values
i 0 than unable the protection
Parametri-CH D:2 U:
Protezione basso SH
Basso SH .......... 03.0°C
Tempo int. ......... 002s
Param. COMM-CH U:
LOP protection
LOP threshold .... -3.0°C
Int. time ............ 001s
Param. COMM-CH U:
MOP threshold ... 12.0°C
Int. time ............ 010s
Delay start up .... 060s
Param. COMM-CH U:
High TCond. protection
TCond. threshold 60.0°C
Int. time ............ 000s
Param. COMM-CH U:
High temp. threshold
suction ........... 030.0°C
Parameters COMM U:
Re rigerant .......... R134a
Parameters COMM U:
Evap. pressure probe
Min. threshold. -0.5 bar
Max. threshold. .07.0 bar
alarm unable
alarm unable
Parameters COMM U:
Alarms delay
SHeat low .......... 0000s
T. suct. high ........ 0000s

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SLS-SLH 10/06
m_manu _drv_9
NOTE ABOUT ALARM DELAY: i the value is 0 sec than unable the alarm,
i during the test there is MOP or T.asp alarm -> than unable the alarms.
NEW_DRV
alarm unable
alarm unable
Parameters COMM U:
Alarms delay
LOP ................... 0000s
MOP ................. 0000s
U:
Insert new
password driver .... 0000
2.3.10 MANUFA TURER LEVEL KEY
Press the “menu” + “prog” keys at the same time, under a valid access code (4939), to enter the Manu acturer Level.
The parameters are available only in Italian.
Enter password
Mani actured 0000 0 9999 4939
Exact password
Enable sensor B8 = N For standard B8 = Y For master unit
B1:Y B2:Y B3:Y ( Note ) B9 = N For chiller B9 = Y For heat pump
B4:Y B5:Y B6:Y B7: Y B10 = N For chiller B10 = Y For heat pump
B8:N B9:N B10:N (See note)
Transducer
Suction pressure
4 ma Range -99.9 99,9 -0.5
20 mA Range -99.9 99,9 7.0
Transducer
Discharge pressure
4 ma Range -99.9 99,9 00.0
20 mA Range -99.9 99,9 30.0
Unit Flag Chiller Heat pump SLS: Chiller
SLH: Heat pump
Abil.black box Flag N=NO Y=YES N
Number o compressor per circuit N° 1 2 2
Driver TXV N° 0 2 0
Rotation Flag Y N Y
Parzializzazioni Numero N° 1 4 4
Type Flag modulante step step
Max auto-reset in each hour
Low pressure 1 N° 0 3 1
Low pressure 2 N° 0 3 1
High pressure 1 N° 0 3 0
High pressure 2 N° 0 3 0
User parameters Type Min. Value Max. Value Default

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SLS/SLH 10/06
User parameters Type Min. Value Max. Value Default
SYS 1
Overload protection
Fan motor 1 N° 0 3 0
Fan motor 2 N° 0 3 0
SYS 2
Overload protection
Thermal compressor N° 0 3 0
SYS 1 N° 0 3 0
SYS 2 N° 0 3 0
Tempo di
Part-winding ms 0 999 999
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 0 60 10
Tempo max funz.
2a parz. (50%) sec 0 60 30
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 0000

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SLS/SLH 10/06
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 ener-
gized 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, com-
pressors 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 compres-
sor is switched off. Until the LWT is above the Setpoint
High Limit, compressors are unloaded according to the
Unload time parameter value.

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SLS/SLH 10/06
5 COMPRESSORS RETURN LIQUID
CONTROL (COOLING MODE)
If Return Control Mode is selected, the return water tem-
perature 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, divid-
ing 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.

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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 con-
stant 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 out-
put 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.

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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 (R134A)
LP1 - Default = 11 bar (R407C) 7 bar (R134A)

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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.