MAXA i-MAX 0466 User manual

i-MAX Industrial inverter air/water heat pump with axial fans
2
03 03-2019 M.S. A.B. 03
02 07-2018 M.S. A.B.
Alignment with Ver415 REV 005 S03
01 09-2017 D.M. A.B.
Functions updating
00 10-2017 A.B. F.M.
Rev Date Author Supervisor Notes
Catalogo / Catalogue / Katalog / Catalogue
MCO01110H8120-03
Serie / Series / Serie / Serie / Série
i-MAX (SSL) 0466 -06115
Industrial inverter air/water heat pump with axial fans
Possible wasted electrical or electronic devices/products should not be located together with normal domestic waste, but disposed according to the
current WEEE law in compliance with the European Directive 2012/19/UE and following modifications 2003/108/EC. Please inform yourself at your
local Administration or at your reseller in case the product will be replaced with a similar one.

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INDEX
1CONSERVATION OF THE MANUAL.......................................................................................................................................... 5
1.1 GRAPHIC SYMBOLS USED IN THE MANUAL ............................................................................................................................ 5
2PERMITTED USES ................................................................................................................................................................... 5
3GENERAL SAFETY GUIDELINES................................................................................................................................................ 5
3.1 PERSONAL PROTECTION EQUIPMENT.................................................................................................................................... 5
3.2 HEALTH AND SAFETY OF WORKERS........................................................................................................................................ 5
4PURPOSES AND CONTENTS OF THE MANUAL......................................................................................................................... 6
5USER – ONBOARD CONTROLLER INTERFACE .......................................................................................................................... 7
5.1 MENU STRUCTURE DIAGRAM ................................................................................................................................................ 7
5.2 MENU CONTENTS................................................................................................................................................................... 8
5.2.1 Setpoint menu ................................................................................................................................................................ 8
5.2.2 Password menu .............................................................................................................................................................. 8
5.2.3 Sensors menu ................................................................................................................................................................. 8
5.2.4 Alarms menu .................................................................................................................................................................. 8
5.2.5 Digital inputs menu ........................................................................................................................................................ 8
5.2.6 Parameters menu ........................................................................................................................................................... 9
5.2.7 Operation hours menu ................................................................................................................................................... 9
5.2.8 USB menu ....................................................................................................................................................................... 9
5.2.8.1 CONTROLLER’S FIRMWARE UPDATING.......................................................................................................................................... 9
5.2.8.2 PARAMETERS UPDATING ............................................................................................................................................................... 9
5.2.9 DISPLAY .......................................................................................................................................................................... 9
5.2.10 LED STATUS DESCRIPTION ............................................................................................................................................ 10
6I/O PORTS OF THE SYSTEM................................................................................................................................................... 10
7OPERATION’S LOGICS........................................................................................................................................................... 10
7.1 DYNAMIC SET-POINT CONTROL ........................................................................................................................................... 11
7.2 CIRCULATOR MANAGEMENT (IF INSTALLED) ....................................................................................................................... 11
7.2.1 OPERATION UNDER THERMOREGULATOR CALL (Default) ........................................................................................... 12
7.2.2 OPERATION UNDER THERMOREGULATOR CALL WITH PERIODIC ACTIVATION ........................................................... 12
7.2.3 OPERATION WITH ACTIVE ELECTRIC HEATER............................................................................................................... 12
7.2.4 CONTINUOUS OPERATION ........................................................................................................................................... 12
7.2.5 LINEAR REGULATION OF THE CIRCULATOR – DOUBLE ΔTWater – .................................................................................. 12
7.2.6 AIR PURGING OF THE SYSTEM...................................................................................................................................... 13
7.3 COMPRESSORS CONTROL .................................................................................................................................................... 13
7.3.1 TRANSITORY OF STARTING ........................................................................................................................................... 13
7.3.2 ON-OFF compressors activation logic........................................................................................................................... 13
7.3.3 Release logic of the ON/OFF compressors.................................................................................................................... 13
7.3.4 INVERTER COMPRESSORS CONTROL IN COOLING MODE ............................................................................................ 14
7.3.5 INVERTER COMPRESSORS CONTROL IN HEATING MODE............................................................................................. 14
7.3.6 SAFE TIME PERIODS...................................................................................................................................................... 15
7.3.7 EMERGENCY CONDITIONS............................................................................................................................................ 15
7.3.8 DEACTIVATION OF THE COMPRESSORS FOR OUTDOOR TEMPERATURE ..................................................................... 15
7.4 HEAT PUMP MODE OPERATION........................................................................................................................................... 15
7.5 HEAT DISSIPATION FAN MOTOR CONTROL .......................................................................................................................... 15
7.5.1 FAN SPEED CONTROL ................................................................................................................................................... 15
7.5.2 FAN SPEED CONTROL IN COOLING MODE.................................................................................................................... 15
7.5.3 FAN SPEED CONTROL IN HEATING MODE .................................................................................................................... 16
7.6 DEFROSTING CYCLE .............................................................................................................................................................. 16
7.6.1 FORCED MANUAL DEFROST ......................................................................................................................................... 16
7.7 COMPRESSOR CRANCKASE HEATER ..................................................................................................................................... 16
7.8 ANTIFREEZE PROTECTION ELECTRIC HEATERS (WHEN THE “KA” ACCESSORY IS PRESENT) .................................................. 16
7.9 REMOTE ON/OFF .................................................................................................................................................................... 17
8ACTIVABLE SIGNALIZATIONS FOR 0466, 0475 AND 0485 SIZES............................................................................................. 17
9ACTIVABLE LOGIC FUNCTIONS WITH GI- MODULE FOR PLANT MANAGEMENT (OPTIONAL) ................................................ 17
9.1 DEFROSTING CYCLE SIGNALIZATION .................................................................................................................................... 17
9.2 PLANT SEASON SIGNALIZATION ........................................................................................................................................... 17

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9.3 ALARM SIGNALIZATION........................................................................................................................................................ 18
9.4 HEAT PUMP LOCKOUT SIGNALIZATION ........................................................................................................................................... 18
9.5 ENABLEMENTOF DOMESTIC HOT WATER PRODUCTION (DHW) ......................................................................................... 18
9.5.1 MEMORIZATION OF THE SENSOR IN HEATING MODE ................................................................................................. 19
9.5.2 SANITARY MODE CALLING FROM DIGITAL INPUT ........................................................................................................ 19
9.5.3 HEATING MODE ON DOMESTIC HOT WATER TANK ..................................................................................................... 19
9.6 SUMMER/WINTER MODE ROMOTE COMMUTATION.......................................................................................................... 19
9.7 PLANT REMOTE SENSOR ...................................................................................................................................................... 19
9.8 AUXILIARY ELECTRIC HEATER ............................................................................................................................................... 20
9.8.1 PLANT CIRCUIT AUXILIARY ELECTRIC HEATER .............................................................................................................. 20
9.8.2 AUXILIARY ELECTRIC HEATER OF THE PLANT IN DEFROST CYCLE................................................................................. 20
9.8.3 ELECTRIC HEATER OF SANITARY WATER PRODUCTION ............................................................................................... 20
9.8.4 UNIQUE AUXILIARY ELECTRIC HEATER FOR BOTH PLANT SYSTEM/DHW PRODUCTION.............................................. 20
9.8.5 SELECTION MODE OF THE AUXILIARY ELECTRIC HEATERS ........................................................................................... 20
9.8.6 MANAGEMENT OF THE CIRCULATOR WITH ACTIVE ELECTRIC HEATER ....................................................................... 21
9.9 BOILER ENABLEMENT........................................................................................................................................................... 21
9.10 ACTIVATION OF AUXILIARY ELECTRIC HEATERS AND BOILER DURING JOINT AND SUBSTITUTION OPERATION TO THE
COMPRESSOR................................................................................................................................................................................... 21
9.10.1 OPERATION IN HEAT PUMP MODE .............................................................................................................................. 21
9.10.2 IN JOINT OPERATION (BAND I) ..................................................................................................................................... 21
9.10.3 IN JOINT OPERATION (BAND II) .................................................................................................................................... 22
9.10.4 SUBSTITUTION OPERATION.......................................................................................................................................... 22
9.10.5 OPERATION AREA - ACTIVATION OF THE AUXILIARY ELECTRIC HEATER AND BOILER (Plant circuit water temperature
sensor is not enabled) .................................................................................................................................................................. 23
9.10.6 AUXILIARY SYSTEMS OFFSET MANAGEMENT............................................................................................................... 26
9.11 DOUBLE SET-POINT MANAGEMENT..................................................................................................................................... 26
9.11.1 SETTINGS ...................................................................................................................................................................... 26
9.11.2 ADJUSTABLE SETPOINTS............................................................................................................................................... 27
9.11.3 COMMUTATIONS.......................................................................................................................................................... 27
9.12 SECONDARY CIRCULATOR MANAGEMENT (RELAUNCHING PUMP)..................................................................................... 27
10 HANDBOOK FOR SOME CONFIGURATIONS OF INSTALLATION.......................................................................................... 27
11 TABLES OF ALLOWED CONFIGURATIONS FOR THE USER AND INSTALLER......................................................................... 27
11.1 SETPOINT CONFIGURATION PARAMETERS .......................................................................................................................... 28
11.2 CONFIGURATION PARAMETERS........................................................................................................................................... 28
11.3 ALARM CONFIGURATION PARAMETERS .............................................................................................................................. 28
11.4 SETTING PARAMETERS ......................................................................................................................................................... 28
11.5 CONDENSATION PARAMETERS ............................................................................................................................................ 29
11.6 CIRCULATOR PUMP CONFIGURATION PARAMETERS........................................................................................................... 29
11.7 DEFROSTING PARAMETERS.................................................................................................................................................. 29
11.8 COMPRESSOR CONFIGURATION PARAMETERS ................................................................................................................... 29
11.9 CONFIGURATION PARAMETERS OF “GI” MODULE –PLANT MANAGEMENT –(OPTIONAL)...................................................... 29
12 WATER WITH GLYCOL....................................................................................................................................................... 30
13 ALARMS MANAGEMENT .................................................................................................................................................. 31
13.1 E000 –REMOTE ON/OFF ...................................................................................................................................................... 31
13.2 E001 –HIGH PRESSURE ........................................................................................................................................................ 31
13.3 E002 –LOW PRESSURE ......................................................................................................................................................... 31
13.4 E003 –THERMAL PROTECTION OF FIRST ON/OFF COMPRESSOR IN BOTH CIRCUITS ........................................................... 31
13.5 E004 –FAN MOTOR ALARM ................................................................................................................................................. 31
13.6 E005 –ANTIFREEZE ALARM .................................................................................................................................................. 31
13.7 E006 –FLOW SWITCH ALARM .............................................................................................................................................. 31
13.8 [E008] DRIVER LIMITATION .................................................................................................................................................. 31
13.9 [E013] THERMAL PROTECTION OF SECOND ON/OFF COMPRESSOR IN BOTH CIRCUITS....................................................... 31
13.10 [E018] HIGH TEMPERATURE WATER SIDE ............................................................................................................................ 31
13.11 [E016] USAGE PUMP 1THERMAL PROTECTION ................................................................................................................... 31
13.12 [E641] HIGH PRESSURE ALARM SWITCH (IN SERIES TO THE COMPRESSOR DISCHARGE TEMP. SENSOR) ............................ 31
13.13 [E611÷E682] SENSORS’ ALARMS .......................................................................................................................................... 31
13.14 [E801÷E971] TIMEOUT INVERTER ........................................................................................................................................ 32
13.15 POWER FAILURE................................................................................................................................................................... 32
13.16 ALARMS LIST......................................................................................................................................................................... 32
13.16.1 HEAT PUMP LOCKOUT ALERT................................................................................................................................... 33

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1CONSERVATION OF THE MANUAL
The manual has to be always kept for future reference. It has to be stored in a safe place, away from dusts and moisture. It has to
be available and accessible to all users who shall consult it any time they are in doubt on how to operate the equipment.
The company reserves the right to modify its products and related manuals without necessarily updating previous versions of the
reference material. It declines also any responsibility for possible inaccuracies in the manual if due to printing or transcription
errors.
The customer shall store any updated copy of the manual or parts of it delivered by the manufacturer as an attachment to this
manual.
The company is available to give any detailed information about this manual and to give information regarding the use and the
maintenance of its own units.
1.1 GRAPHIC SYMBOLS USED IN THE MANUAL
Indicates prohibited operations.
Indicates operations that can be dangerous for people and/or disrupts the correct operation of the equipment.
Hazardous electrical voltage - risk of electric shock
Indicates important information that the operator has to follow in order to guarantee the correct operation of the
equipment in complete safety. It indicates also general notes.
2PERMITTED USES
The company excludes any contractual and extra contractual liabilities for damages caused to persons, animals or objects,
by incorrect installation, setting and maintenance, improper use of the equipment, and the partial or superficial reading of the
information contained in this manual.
These units have been designed only for heating and/or cooling water. Any other use not expressly authorized by the
manufacturer is considered improper and therefore not allowed.
The execution of all works must be performed by skilled and qualified personnel and competent in the existing rules in the
country in which the appliance will be installed.
3GENERAL SAFETY GUIDELINES
Before beginning to operate on the units every user has to be perfectly knowledgeable about the functions of the equipment and
its controls and has to have read and understood the information listed in the user’s-installer’s and control manuals.
3.1 PERSONAL PROTECTION EQUIPMENT
When operating and maintaining the unit, it is required to use the following personal protective equipment.
Protective clothing: Maintenance men and operators have to wear protective clothing that complies with the
basic safety requirements currently in force. In case of slippery floors, users have to wear safety shoes with non-
slip soles.
Gloves: During maintenance or cleaning operation protection gloves have to be used.
Mask and goggles: Respiratory protection (mask) and eye protection (goggles) should be used during
cleaning and maintenance operations.
3.2 HEALTH AND SAFETY OF WORKERS
The European Community has adopted a number of directives on workplace’s health and safety, which include 89/391/CEE,
89/686/CEE, 2009/104/CE, 86/188/CEE and 77/576/CEE directives. Every employer shall implement such provisions and ensure
that the workers respect them:
It’s forbidden:
To remove and/or tamper with any safety device.
The use of the appliance by children or unassisted disabled persons.
To touch the appliance when barefoot or parts of the body are wet or damp
To clean the unit when the power is ‘ON’.
To pull, remove or twist the electrical cables coming out from the unit.
To step with your feet on the appliance, sit down and/or place any type of object.
To spray or pour water directly on the unit.
To dispose of, abandon or leave within reach of children packaging materials (cardboard, staples, plastic bags,
etc.) as they may represent an environmental and health hazards.
To tamper with or replace parts of the equipment without the specific consent of the manufacturer. The
manufacturer shall have no responsibility whatsoever in case of unauthorized operations.

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WARNING:
Before proceeding, you should read the user’s-installer manual accompanying the appliance.
All the operations described below must be carried out only by QUALIFIED PERSONNEL.
The wiring to the terminal block must be performed by qualified personnel.
Any routine and/or not-routine maintenance operation shall be carried out when the equipment has been shut
down, disconnected from electric power supply.
Do not put neither your hands nor insert screwdrivers, spanners or other tools into moving parts of the
equipment.
The equipment supervisor and the maintenance man have to receive suitable training for the performance of
their tasks in safety.
The access to the electric panel is limited only for authorized personnel.
Operators have to know how to use personal protective devices and have to know the accident-prevention
guidelines contained in national and international laws and norms.
The operator’s workplace has to be kept clean, tidy and free from objects that may prevent free movements.
Appropriate lighting of the work place shall be provided so as to allow the operator to carry out the required
operations safely. Poor or too strong lighting can cause risks.
Ensure that the work places are always adequately ventilated and that aspirators are working, in good
condition and in compliance with the requirements of the laws in force.
Not all the configurations can be simultaneously enabled and/or changed.
Other values different than those of default can ensure the proper operation of the unit, in case of doubt about
the value to be set contact please our office.
The company excludes any contractual and extra contractual liabilities for damages caused to persons, animals
or objects, by incorrect installation, setting and maintenance, improper use of the equipment, and the partial
or superficial reading of the information contained in this guide.
The access to the electric panel is limited for authorized personnel only.
It’s forbidder to carry out any work on the equipment under voltage.
To touch the equipment if you are not allowed.
If the lightning risk is high, the unit must be protected, the risk assessment must comply with the CEI EN 62305-2
regulation.
If there is a possibility that a lightning can strike the area around the appliance, shut down the unit and
disconnect the system upstream switch.
Make sure to ground the unit.
Do not ground the unit with pipes or lightning rods.
A poor grounding of the unit can result in electrocution.
Warning: Electrostatic discharges can damage the electronic components, before performing any work; ground
the electrostatic charge by touching objects such as water or heating pipes.
Requirements before performing electrical work on the control board:
Turn off the unit from the control panel ("OFF" displayed).
Put the switch “QF” general differential on OFF position
Wait for 15 seconds before getting access to the electric board
Check the ground connection before beginning any operation.
Be sure that you are well insulated from the ground, with dry hands and feet, or by using insulating platforms
and gloves.
Check that there is no foreign material near the system.
4PURPOSES AND CONTENTS OF THE MANUAL
This manual collects the basic information concerning the configuration of the panel controller of the units.
It is addressed to the installer/user of the unit: it allows you to operate this equipment efficiently, even if the user does not have
any previous specific knowledge of it.
Not all the described functions can be individually and/or simultaneously selected. Please contact the technical office for any
information.
This manual describes the characteristics of the equipment when it was being put on the market; therefore, it may not capture
later technological improvements introduced by the company as part of its constant endeavors to enhance the performance,
ergonomics, safety and functionality.
The company introduces also technological improvements and is not constrained to update the manuals for previous versions of
appliances that could not be compatible. So make sure to use, for the installed unit, the supplied manual.
It’s recommended that, the user must follow the instructions contained in this booklet, especially those concerning the safety and
routine maintenance.

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5USER – ONBOARD CONTROLLER INTERFACE
In normal visualization, the 7 segment display with 4 digits shows the regulating temperature in tenths of degrees or the warning
code if at least one alarm is active. The type of visualization in the menu mode page is depending on the position where you are.
Labels and codes are used to help the user to identify the settings of the display.
It is used to select the operating mode, and to reset the manual resetting alarms.
Each time you press the Mode button, the operating mode changes as per the sequence below:
off cool off
During the parameters’ setting, this button can be used to revert BACK to the previous level.
It allows you to enter into the setting menu parameters and to adjust the summer set point value.
UP button: In the setting mode, this button allows you to move up to a higher menu or to increase the value of a
parameter when you are in the “edit” mode.
DOWN button: In the setting mode, this button allows you to shift to a lower menu or to decrease the value of a
parameter when you are in the “edit” mode.
WARNING
All the operations with installer visibility must be carried out by qualified personnel.
Not all the configurations can be simultaneously enabled and/or changed.
Other values different than those of default may ensure the proper operation of the unit, in case of necessity
contact please our office.
The company excludes any contractual and extra contractual liabilities for damages caused to persons,
animals or objects, by incorrect installation, setting and maintenance, improper use of the equipment, and
the partial or superficial reading of the information contained in this manual
5.1 MENU STRUCTURE DIAGRAM
Level 0 (U) = It’s always visible

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Level 1 (M) = it’s visible if you enter the maintainer or manufacturer password
Level 2 (C) = it’s visible if you enter the manufacturer password
Level 3 (A) = it’s visible only via Modbus
5.2 MENU CONTENTS
The main functions of the menus are listed below, especially when there are some unambiguous functions. The main menu
manages the following parameters:
MENU
LABEL
LIVEL OF PASSWORD
OTHER CONDITIONS
Setpoint
Set
User
Not accessible if the Hi-T control panel is connected
Sensors
tP
Installer
---
Alarms
Err
User
Only in case of active alarms
Digital inputs
Id
Installer
---
Parameters
Par
Installer
---
Password
PSS
User
---
Number of operating hours
oHr
Installer
---
USB
USb
Installer
Only in the USB flash drive is present with its files
You have to enter in the password menu for inserting its password in order to enable an access with a greater privilege. Once you
exit completely from the menus, you lose the password concession and need to re-enter it again for getting access.
5.2.1 Setpoint menu
You can display and change the different setpoints.
SETPOINT
DESCRIPTION
UNIT
DEFAULT
RANGE
Coo
First setpoint in the summer
°C
7.0
H03 ÷ Co2
Hea
First setpoint in the winter
°C
45.0
He2 ÷ H01
*San
DHW setpoint
°C
48.0
H02 ÷ H01
Co2
Second setpoint in the summer
°C
18.0
Coo ÷ H03
He2
Second setpoint in the winter
°C
35.0
H02 ÷ Hea
5.2.2 Password menu
Enter the password for the desired access level. The controller will automatically open the desired access level and then they will
appear on this level the test items which can be enabled from this level.
5.2.3 Sensors menu
The value of the various probes is displayed. The number of visible sensor depends on the presence of the I/O expansion modules.
Particular cases:
•Err = Sensor is faulty
•--- = Sensor not used (no function is associated to such sensor)
By entering the maintainer password in the menu of analog inputs "tP", at the level 1 of the menu structure diagram of the on-
board control panel, you can read the values of the current sensors:
tp
DESCRIPTION
Unit
t01
Water inlet temperature
°C
t02
Water outlet temperature
°C
t03
Compressor intake temperature
°C
t04
Compressor discharge temperature
°C
t05
Outdoor air temperature
°C
t09
Low pressure
bar
t10
High pressure
bar
*t16
Plant water temperature remote sensor (if present)
°C
*t17
Domestic hot water temperature (if present)
°C
(*) If the “Gi” optional module is installed.
5.2.4 Alarms menu
This menu appears only in case of alarms warning. You can check all active alarms. For multi-circuit units (the ALCx label allows to
get access to the alarms of the circuit number x) the alarms are divided by circuit.
5.2.5 Digital inputs menu
You can check the status of the digital inputs as below:
0 = inactive input
1 = active input

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5.2.6 Parameters menu
The parameters are collected into groups; each group is identified by a three-digit code, while the index of each parameter is
preceded by a letter.
DESCRIPTION
GROUP’S IDENTIFICATIVE CODE
PARAMETER’S INDEX
VISIBILITY
Configuration
CnF
H-
USER/INSTALLER
Compressor
CP
C-
INSTALLER
Fan motor
FAn
F-
INSTALLER
Alarms
ALL
A-
INSTALLER
Regulation
Re
b-
INSTALLER
Pump
PUP
P-
INSTALLER
Electric heaters
Fro
r-
INSTALLER
Defrosting
dFr
d-
INSTALLER
Electronic valve
EEu
U-
INSTALLER
Offset
OFF
o-
INSTALLER
Inverter compressors
nCP
n-
INSTALLER
5.2.7 Operation hours menu
You can display the number of operating hours of the compressors and of the pumps.
Press the ESC button for 3 seconds to resets the actual number of operating hours. Note that, the access to the menu is allowed
only by using password.
5.2.8 USB menu
The available functions through the use USB flash drive connected to the board are indicated below.
5.2.8.1CONTROLLER’S FIRMWARE UPDATING
You can make the update of the controller in case of new versions of the firmware by using the USB flash dive via its port on the
controller itself.
For the updating:
1. Copy the updated files in the main directory of a USB pen-drive;
2. Place the unit in standby mode and turn it off, placing the main switch on OFF position;
3. Introduce the USB pen-drive into its port on the controller;
4. Turn ON the unit by placing the main switch in ON position;
5. Enter at the page of the parameters PRGPSSPRG(introduce the maintainer password)PRGUSBUPdFPRG.
The automatic firmware update process starts with the selection of this option, the display shows the transferred data in
Kilobytes. When the update is completed the display shows "boot" then the LEDs will light up in sequence.
6. .Once the update is completed, the board returns to normal operation and the appliance is ready to start operation.
7. Turn off the unit by placing the main switch in OFF position.
8. Remove the USB pen-drive from its port.
9. Feed the unit by placing the main switch on the ON state.
Perform please this procedure for all controllers in the unit.
5.2.8.2PARAMETERS UPDATING
You can upgrade the parameters using the USB pen-dive via its port on the controller.
For the updating:
1. Copy the update files in the main directory of a USB pen-drive;
2. Place the unit in standby mode and turn it off, placing the main switch in OFF position;
3. Introduce the USB pen-drive in its port on the controller;
4. Turn ON the unit by placing the main switch in the ON position;
5. Enter at the page of the parameters PRGPSSPRG(introduce the maintainer password)PRGUSBUPPAPRG.
The automatic firmware update process starts with the selection of this option, the display shows the transferred data in
Kilobytes. When the update is completed the display shows "boot" then the LEDs will light up in sequence.
6. Once the update is completed, turn off the unit by placing the main switch on OFF position.
7. Remove the USB pen-drive from its port.
8. Turn ON the unit by placing the main switch on the ON state;
5.2.9 DISPLAY
In Normal view, the display shows, the outlet water temperature reported to tenths of degrees, or alarm code if any is active. In
case of multiple alarms, it will display the first alarm, while the second appears when the first is reset. Into the menu mode, the
display depends on the current position where you are.
WARNING
All the operations with installer visibility must be carried out by qualified personnel.
The company excludes any contractual and extra contractual liabilities for damages caused to persons, animals
or objects, by incorrect installation, setting and maintenance, improper use of the equipment, and the partial or
superficial reading of the information contained in this manual.

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5.2.10 LED STATUS DESCRIPTION
Compressor LED
•ON if the compressor is running
•OFF if the compressor is off
•
FLASHING if timings are in progress waiting for compressor’s start up.
Sanitary water LED
•ON if sanitary mode is fulfilled active
•OFF if the sanitary mode is not active
•FLASHING if the sanitary production is in progress (sanitary valve is active)
Defrosting LED
•ON in defrost operating mode
•OFF if defrosting mode is disabled or completed
•FLASHING if defrosting cycle interval’s time counting is in progress.
Antifreeze electric heater LED •The LED is ON if the antifreeze electric heater is active.
Water pump LED •The LED is ON if the water pump is running.
Alarm LED •The LED is ON if an alarm is activated.
Heat LED •The LED is ON if the unit is in the heating mode operation.
Cool LED •LED is ON if the unit is in the cooling mode operation.
6I/O PORTS OF THE SYSTEM
The configurable I/O ports are as follows:
Parameter
Default
value
Value = Function Terminals Notes
H47
2
Remote on-off digital input
ID3
Voltage free contact input
*H81 0
21= Defrosting cycle signalization
24= Alarm signalization
31=Plant season signalization
47=Lockout signalization
DO3(phase)
DO3N(neutral) Under voltage output 230Vac, 50Hz, 2A (AC1).
(*) For the sizes of 0466, 0475 and 0485
Wherever the GI optional plant management kit is present, you have a third controller located inside the electrical board acting as
an expansion module of the I/O ports. By mean of this controller, it is therefore possible to increase the number of logic functions
that can be managed by the main controller; in particular, the following I/O ports can be activated by the previous controller.
Parameter
Default
value
Value = Function Terminals Notes
H57 0
0=Disenabled function
3=Selected mode
19=Thermostat
26=Double set point
28=Sanitary call
ID3E Voltage free contact input
H28
0
6=DHW remote sensor
ST6E
NTC-10kΏ at 25°C β 3435
H29
0
41=Plant circuit water remote sensor
ST7E
H86 0 21=Defrost cycle warning
DO1(phase)
DO1N(neutral)
Under voltage output 230Vac, 50Hz, 2A
(AC1).
H87 0 31=Plant season warning
DO2(phase)
DO2N(neutral)
H88 0
24=Alarm warning
47=Lockout warning
DO3(phase)
DO3N(neutral)
H89 0 6= Sanitary valve
DO4(phase)
DO4N(neutral)
H90 0
26= Double set-point valve
43= Secondary circulator
DO5(phase)
DO5N(neutral)
7OPERATION’S LOGICS
The following operation logics are enabled by the master controller CB (MASTER), situated on the front panel of the unit.

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7.1 DYNAMIC SET-POINT CONTROL
The controller allows change the set-point by adding a value depending on the temperature of the outdoor air sensor. This
function can be used if necessary by modify the parameter values, following the below information (it is the installer’s
responsibility to change the parameters).
b08 active = 1/not active = 0 dynamic set-point (in the case of using of the optional “Hi-T” remote control panel for climatic
compensation, b08 must be deactivated).
b09 = Maximum offset in cooling.
b10 = Maximum offset in heating.
b11 = Set of outdoor temperature in cooling.
b12 = Set of outdoor temperature in heating.
b13 = ΔT in cooling.
b14 = ΔT in heating.
For parameters setting, please see paragraph 11.4.
Set-point modification as a function of the outdoor temperature:
7.2 CIRCULATOR MANAGEMENT (IF INSTALLED)
The circulator of the pump can be set according to one of the following operation modes:
-Operation by thermo-regulator (default)
-Operation by thermo-regulator with periodic activation
-Continuous operation
The circulator will immediately switch off if:
-You have a pump (circulator) locking alarm including the manual reset flow switch alarm.
-The unit is in stand-by mode or when it’s switched off from a remote input (when it’s turned ON). The circulator turns off
always with a delay given by P02.
The circulator is always running if the antifreeze heaters are ON.
The circulator can be configured with the parameter P03 in order to make it operating independently than the compressor or
under a call for operation.
P03 = 0 for Continuous operation during heating/cooling modes(default),
P03 = 1for operation under the thermoregulatory call
Note: Whenever the flow switch alarm is automatically reset the pump is ON even if the compressor is off.
Otherwise, the circulator remains always in operation if the antifreeze heaters are ON or when the hydraulic pump operates in
antifreeze mode. The operation in antifreeze mode starts if the water setting temperature decreases below P04 °C (default value
5°C), and stops if the water setting temperature increases above P04+P05 °C (the default value of P05 is 2,0°C).
The regulation of the circulator is linear type (see paragraph 7.2.5). To changer the parameters, please see paragraph 11.4.
Cooling
Heating

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7.2.1 OPERATION UNDER THERMOREGULATOR CALL (Default)
During this operating mode (P03=1), the thermo-regulator actuates the circulator; after a time delay of P01 seconds from the
circulator pump startup, the compressor also will turn ON. However, during the power off status, the circulator pump turns off
with a delay of P02 minutes after shutdown status by mean of the thermo-regulator (the shutdown status is corresponding to the
off status of the compressor).
If the flow switch alarm is active in automatic reset, the pump is anyway ON even if the compressor is off.
If you enable the operation of the unit from "DI2" digital input corresponding to the remote "on-off" the circulator will start
operation immediately for 2 minutes regardless of the internal thermoregulation of the unit (the activation of water recirculation
in the plant circuit leads to the correct activation of the thermoregulation).
7.2.2 OPERATION UNDER THERMOREGULATOR CALL WITH PERIODIC ACTIVATION
The function is disabled if P17= 0 (default). If the pump is set to operate by thermo-regulator actuation (P03 = 1), it will be
activated periodically for a duration given by the parameter P17 (in seconds) after a counting time set by the parameter P16 (in
minutes), activated when the thermoregulation is fulfilled and the pump turned off.
In case of activation of the flow switch alarms with automatic reset the pump is still ON even if the compressor is off.
The periodic function is interrupted also in case of intervention of the antifreeze thermo-regulator which constrains the pump to
operate. To change the parameters, please see paragraph please see paragraph 11.4.
7.2.3 OPERATION WITH ACTIVE ELECTRIC HEATER
The presence of optional “GI” module is needed for this functions.
See paragraph 9.8.6.
7.2.4 CONTINUOUS OPERATION
In this mode of operation (active if P03 = 0), the pump is always ON. It turns off only when the unit stops to operate.
7.2.5 LINEAR REGULATION OF THE CIRCULATOR – DOUBLE ΔTWater –
The analog output varies according to difference in temperature between water inlet and water outlet of the heat exchanger.
•P06 set ΔTWater inlet/outlet of modulating pump in heating mode
•P07 maximum speed of the modulating pump
•P08 minimum speed of the modulating pump
•P09 set ΔTWater inlet/outlet of the modulating pump in cooling mode.
•P10 Modulating pump linear band
−In cooling mode: [T Water inlet] – [T Water outlet]
−In heating mode: [T Water outlet] – [T Water inlet]

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Example in cooling operation:
If the difference in temperature between water inlet and outlet is greater than P09 + P10, the pump will run at maximum speed.
If the difference temperature between water inlet and outlet is less than P09 - 0.2°C, the pump will run the minimum speed.
In the other cases, the pump modulates trying to match the temperature difference with P09. For the heating mode, the same
considerations are valid with replace only P06 with P09. Please see paragraph 11.6 for changing the parameters.
Warning: During the DHW production mode, the pump is constrained to operate at its maximum speed.
In domestic hot water production mode, the pump will operate at the maximum speed.
7.2.6 AIR PURGING OF THE SYSTEM
This function allows the air purging of the system, during this operation, the circulator runs at its maximum speed.
To enable the function:
•Put the controller in OFF mode
•Enter at the parameters PRGPSSPRG(introduce the maintainer password)
•Press simultaneously for 3seconds the buttons UP and DOWN.
The circulator of the plant will run at the maximum speed for 5 minutes then it stops the operation.
It is possible to stop manually the air purge cycle function of the system by pressing the MODE/ESC button, or by pressing
simultaneously the UP and DOWN buttons for 3 seconds.
During this function, the flow-switch alarm is deactivated.
7.3 COMPRESSORS CONTROL
The i-Max system uses two refrigerant circuits; each circuit is composed by an inverter compressor and by one or two other on/off
compressors. Follow the activation logic of compressors.
7.3.1 TRANSITORY OF STARTING
When the compressors are all off, in conjunction with the pre-opening of the expansion valve, the reversing valve is commutated
in the opposite direction to that required by the actual mode for 5 seconds in order to allow the equilibrium of the optimal
pressures for starting the first capacity step.
The modulating compressor will always be the first compressor to be start and the last one to stop operation.
The activation and control logic of the modulating compressor follows the thermoregulation curve.
Below are reported the phases of activation and shutdown logic of the other compressors and the behaviour of the modulating
compressor during these phases
7.3.2 ON-OFF compressors activation logic
The ON/OFF compressor starts operation when the required power consumption for the modulating compressor is higher than
90% for a continuous duration given by b16 (default 60 seconds).
The activation of the compressor can occur in 3 steps:
1. Reduction of the output capacity of the modulating compressor to the minimum frequency.
2. Activation of the first ON/OFF compressor when the frequency of the modulating compressor has achieved 45Hz.
3. Activation of second ON/OFF compressor after 10 seconds.
4. The compressor restarts modulation by mean of the thermoregulator after 30 seconds from the ON/OFF compressor
start up.
The unavailability of activation of an On/Off compressor could be also caused by the logic related to the protection or capacity
limitations of the compressor.
7.3.3 Release logic of the ON/OFF compressors
If the thermoregulation that is required for the modulating compressor is corresponding to the minimum needed output capacity
for a period less than 60s, an ON/OFF compressor will stop operation and once the shutdown is completed, the next ON/OFF
compressor will stop also operation after the usual duration of 60 seconds.
Note: In the case in which the regulation temperature is found to be lower than Set - b05, the release of the running compressors
occurs simultaneously.

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7.3.4 INVERTER COMPRESSORS CONTROL IN COOLING MODE
The management of the compressors depends on the ambient temperature and on the water temperature setpoint.
The PI type regulation with:
•ST = regulation temperature sensor
•Set cool (G01) = setting of cooling setpoint
•b01 = cooling regulator proportional band
•b05 = compressor control delta cut-off
•b25 = compressor regulation delta cut-on
•b07 = integral time
•HzMin = Minimum frequency of operation derived from the algorithms of limitation
•HzMaxReg = Maximum working frequency of the compressor in cooling mode based on the limitations described in the
previous paragraphs
466
475
485
695
6105
6115
b05 (°C)
0,5
0,5
0,5
0,5
0,5
0,5
b25 (°C)
2,5
2,5
2,5
2,0
2,0
2,0
7.3.5 INVERTER COMPRESSORS CONTROL IN HEATING MODE
The compressors are active in heating mode if the heat pump is enabled
•H09 = Configuration of the heat pump presence parameter (0 = Heat pump not present; 1 = heat pump is present)
•ST = regulation temperature sensor
•Set heat G02= setting of heating setpoint
•b02 = compressor regulation band in heat pump mode
•b05 = compressor control delta cut-off
•b25 = compressor regulation delta cut-on
•b07 = integral time
•HzMin = Minimum frequency of operation derived from the algorithms of limitation
•HzMaxReg = Maximum working frequency of the compressor in cooling mode based on the limitations described in the
previous paragraphs.
For the values of the parameters b05 and b25, please refer to the table reported in the previous paragraph.
The following curve shows the adjustment without integral component (b07 = 0)

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7.3.6 SAFE TIME PERIODS
The compressors respect the minimum waiting time for the turning on and off actions (regardless of their configurations and if
they are inverters or ON/OFF type).
C01 = Minimum Off time of a compressor # 240 sec (default).
C02 = Minimum time between two start-up of the same compressor # 360 sec (default).
C03 = Minimum delay time between the start-up of a compressor and the next one # 10 sec (default).
C04 = Minimum delay time between the shutdown of a compressor and the next one # 0 sec (default).
7.3.7 EMERGENCY CONDITIONS
If an alarm is warned by one of the inverters, the compressor corresponding to the faulty inverter cannot startup and the error
code will be displayed, note that, the alarm of any inverter will stop the operation of the whole compressors.
When the serviceman operates on the appliance and decides to make it operating by extruding the compressor related to the
faulty inverter, in order to do that, he must change the value of the parameter N06 from 0 to 1.
Such setting will affect immediately the operation and will be memorized; the serviceman/installer should restore the setting
values once the fault inverter has been repaired or replaced.
7.3.8 DEACTIVATION OF THE COMPRESSORS FOR OUTDOOR TEMPERATURE
If the outdoor temperature sensor is configured and is not in trouble, so the compressors cannot work because of low outdoor
temperature. The function is enabled if:
•Outdoor temperature sensor integrated and operating.
•Parameter Pa r07 = 1.
7.4 HEAT PUMP MODE OPERATION
This is the normal operation in which the auxiliary electric heaters turn on if the heat pump fails to meet the setpoint temperature
within a reasonable time (see the paragraph related to auxiliary electric heaters).
7.5 HEAT DISSIPATION FAN MOTOR CONTROL
The control of the dissipation is as a function of the condensing pressure in chiller mode operation, whereas, it depends on the
evaporation pressure in heat pump mode operation.
The adjustment of the fan speed occurs depending on the operation of the compressor.
The fan stop is bypassed for a duration equal F12 beginning from a compressor startup of the circuit. During this period, if the
controller requires the cut-off, the fan will run at minimum speed. Please see paragraph 12.5 for changing the parameters.
7.5.1 FAN SPEED CONTROL
The condensation control depends on the condensing pressure in chiller mode and on the evaporation pressure in case of heat
pump mode.
The fan speed can be independently controlled by the compressors or under the actuation of the fan motor.
•F05= fan output mode
F05 = 0: if all the compressors of the circuit are switched off and the fan is switched off. The fan stop is bypassed for a period equal
to F12 beginning from a compressor start-up of the circuit. During this period, if the controller requires the cut-off, the fan will run
at minimum speed.
F05 = 1: The fan control is independent from the compressor (the fan motor operates only according to the condensing pressure).
Please see paragraph 11.5 for changing the parameters.
7.5.2 FAN SPEED CONTROL IN COOLING MODE
The fan speed control in cooling mode occurs according to the diagram shown below, where:
F06 = Minimum fan speed in cooling mode;
F07 = Maximum silent fan speed in cooling mode
F08 = Set temperature/pressure to the minimum fan speed in cooling mode
F09 = Fan motor linear band in cooling mode
F10 = Delta cut-off of the fan
F11 = Cut-off hysteresis and silent/maximum fan speed
F13 = Maximum fan speed in cooling mode
F14 = Set temperature/pressure to the maximum fan speed in cooling mode
F6-F10 = Set forced fan stop for low condensing pressure

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7.5.3 FAN SPEED CONTROL IN HEATING MODE
The fan speed control in heating mode follows the diagram shown below, where:
F10 = Delta cut-off of the fan in cooling/heating mode
F11 = Cut-off hysteresis in cooling/heating mode
F15 = Minimum fan speed in heating mode
F16 = Maximum silent fan speed in heating mode
F17 = Set pressure for the minimum fan speed in heating mode
F18 = Fan speed linear band in heating mode
F19 = maximum fan speed in heating mode
F20 = Set pressure for the maximum fan speed in heating mode
F17+F10 = Set forced fan stop for high evaporating pressure
The fan speed can be controlled via analog/digital outputs or, alternatively, via serial on the same serial of the modulating
compressor. Please see paragraph 11.5 for changing the parameters.
7.6 DEFROSTING CYCLE
The defrost cycle function is available only in heat pump mode and is used to prevent the frost formation on the surface of the
air/air coil. The frost formation on the evaporator, which occurs more frequently at very low ambient temperatures, further the
important decreasing of the thermal efficiency of the unit, it can lead also to the risk of damaging the unit itself. The adjustable
parameter d01 enables the defrost operation (=1 enabled defrosting). Please see paragraph 12.7 for changing the parameters.
7.6.1 FORCED MANUAL DEFROST
If the appliance is in ON in heating mode, you can force manually the defrosting mode by pressing the UP, DOWN, and ENTER
buttons for 3 seconds.
The same thing can be done via serial, sending the modbus 200 register value '-1'. This item will not change the state of the
appliance, but only leads to forced manual defrost.
7.7 COMPRESSOR CRANCKASE HEATER
The crankcase heater operates when the compressor remains off for at least 30 minutes and if the discharge temperature is below
20°C (with hysteresis of 2.0°C). When the compressor restarts, the crankcase heater will stop.
7.8 ANTIFREEZE PROTECTION ELECTRIC HEATERS (WHEN THE “KA” ACCESSORY IS PRESENT)
The electric heaters of water antifreeze, installed on the outer plates’ surfaces of the evaporator, turn on even if the unit is off
(but energized) if the outlet water temperature goes below r02 °C (default is 4°C) in heating mode or below r03 °C (default is 4°C)
in cooling mode and in shut off condition. The same electric heaters are switched off when the temperature measured by the

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outlet water sensor exceeds r02+r06 in heating mode or r03+r06 in cooling mode and in shut off condition (the default value is
r06=2,0°C). The heating cable placed on the basement of the appliance turns on when the outdoor air temperature decreases
below 3°C and the unit starts the defrosting cycle (or if r19=0 even if the unit is not in defrosting cycle, or in stand-by mode). It will
be deactivated if the outdoor temperature exceeds 5°C or the last defrosting cycle is concluded after more than r19 minutes
(default 10 minutes) (with r19≠0).
If you want to produce gelid water, it is necessary to modify the actions of antifreeze resistances, as well as the set of activation of
the antifreeze alarm (A08 = 4°C by default) and its hysteresis (A09 = 3.0°C by default).
7.9 Remote ON/OFF
The ON/OFF function is already enabled by default. Remove the bridge of the terminal block then the unit will be placed in stand-
by mode (in such status the display of the on-board unit controller will show the "E00" code). When the contact is closed, the
appliance exits from standby mode and the circulation pump will be activated for 2 minutes.
To change this function, enter at the parameters PRGPSSPRG(introduce the maintainer password)PRGPArPRGCnF
See paragraph 11.2.
Note: In the case of a remote switch Off during the defrost cycle, the unit will terminate this process before stopping completely
the cooperation.
Parameter
Unit
Value
Description
Terminals
Note
H46
Num
2 (default)
Remote On/Off digital input
ID2-ID2
Non-voltage digital input
If the domestic hot water is enabled and the parameter “H10” is configured as below:
−If H10 = 1/3/5, the remote on-off function has no any effect on sanitary operation; it only disenables the heating and
cooling on the plant system side (in such case the "SAN" item will be shown on the display of the on-board unit controller).
−If H10 = 2/4/6, the remote on-off function disenables the production of domestic hot water and the operation of the heat
pump in heating and cooling mode on plant circuit side.
8ACTIVABLE SIGNALIZATIONS FOR 0466, 0475 AND 0485 SIZES
As for the sizes indicated above, on the DO3 – DO3N terminals (Parameter H81), it’s possible to configure a 230Vac signal output
voltage by setting the following user parameters introducing the installer password in the control panel located on the front panel.
Value
Description
21
Signalization of defrosting period
•The digital output is activated at the beginning of defrosting cycle, once the Pa d06 time period has terminated.
•
The digital output is deactivated at the end of defrosting cycle, once the Pa d07 time period is terminated.
24
Signalization of heat pump alarm
31
Signalization of plant season.
•The output is active in COOLING operation
•The output is not active in heating operation
•The output is not active when the unit s OFF.
During the DHW production and defrosting cycle, the output keeps the settings of the provenance season.
47
Signalization of appliance lockout
9ACTIVABLE LOGIC FUNCTIONS WITH GI- MODULE FOR PLANT MANAGEMENT (optional)
The following functions can be activated by the on-board controller which is located on the front panel of the unit.
9.1 DEFROSTING CYCLE SIGNALIZATION
It is possible to configure a digital output for the signalization of the beginning of defrosting cycle.
To enable this function, you should enter at the page of parameters PRGPSSPRG(enter the maintainer password)
PRGPArPRGCnF.
See paragraph 11.2.
Parameter
Unit
Value
Description
Terminals
Notes
H86 num 21
Undervoltage output for defrost
cycle warning
DO1E(phase)
DO1E N(neutral)
Under-voltage output 230V ac, 50Hz, 5A resistive, 1A inductive.
Should be connected to the relay coil in order to get a free contact.
9.2 PLANT SEASON SIGNALIZATION
It is possible to configure a digital output for the signalization of the plant season mode of the unit.
The output is ON during summer mode operation, however is OFF when the unit is not operating or in winter mode.
The output keeps the configuration of last season operating mode during the DHW production or defrosting cycle.
To enable this function, you should enter at the page of the parameters PRGPSSPRG(introduce the maintainer
password)PRGPArPRGCnF.
See paragraph 11.2.
Parameter
Unit
Value
Description
Terminals
Notes
H87 num 31
Under-voltage output for plant
season signalization
DO2E(phase)
DO2E N(neutral)
Under voltage output single phase 230Vac, 50Hz, 2A (AC1),
for connection to the relay coil for obtaining a free contact.

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9.3 ALARM SIGNALIZATION
It is possible to configure an under-voltage output for alarm signalization.
To enable this function, enter at the page of the parameters PRGPSSPRG (introduce the maintainer password)
PRGPArPRGCnF
See paragraph 11.2.
Parameter
Unit
Value
Description
Terminals
Notes
H88 num 24 Under-voltage output for alarm
alert
DO3E(phase)
DO3E N(neutral)
Under voltage output single phase 230Vac,
50Hz, 2A (AC1), for connection to the relay
coil for obtaining a free contact.
9.4 Heat pump lockout signalization
It is possible to configure a digital output for the heat pump unit lockout warning.
The output switches will be activated if one of the following alarms is active with the following conditions:
To enable this function, enter at the page of the parameters PRGPSSPRG(introduce the maintainer password)
PRGPArPRGCnF
See paragraph 11.2.
Parameter
Unit
Value
Description
Terminals
Notes
H88 num 47
Under-voltage output for heat
pump unit alert
DO3E(phase)
DO3E N(neutral)
Under voltage output single phase 230Vac, 50Hz, 2A (AC1), for
connection to the relay coil for obtaining a free contact.
9.5 ENABLEMENT OF DOMESTIC HOT WATER PRODUCTION (DHW)
In sanitary mode, the maximum serviceable capacity is employed (as if the thermoregulator is requiring always the 100% of
capacity). However, the various limitations of the maximum frequency associated with the envelope and the limitation for
maximum electrical absorption are active.
To make active this function, it is necessary to connect to ST2E – ST2E terminals (enabled as analog input) a temperature sensor
which should be placed inside the water tank. Once connecting and placing the sensor, then it is necessary to enable the domestic
hot water function.
To enable this function, enter at the parameters PRGPSSPRG(introduce the maintainer password)PRGPAr
PRGCnF.
I/O port – Parameter
Value
Function
H10
0 (default)
The function is not active
1
Active function in heating and cooling mode.
The remote switching on-off function doesn’t deactivate the domestic hot water production (DHW).
2
The function is active in heating and cooling mode.
The remote switching on-off function deactivates the domestic hot water production (DHW)
3
The function is active in heating mode.
The remote switching on-off function doesn’t deactivate the domestic hot water production (DHW).
4
The function is active in heating mode.
The remote switching on-off function deactivates the domestic hot water production (DHW)
5
Active function in cooling mode.
The remote on-off function doesn’t deactivate the domestic hot water production (DHW).
6
Active function in cooling mode.
The remote on-off function deactivates the domestic hot water production (DHW).
H61
6
Activation of domestic hot water temperature sensor DHW (ST6E terminals)
H90
6
DHW valve command
b03
3°C
Band in sanitary mode
If the DHW temperature is below the set point value (PRG->Set->SAN), the unit activates the sanitary valve and the compressor
will be placed at the maximum frequency starting the modulation at 1°C before (setpoint-1°C) the set value and it stops at 1°C
after the set value (setpoint+1°C). Once achieved the set point value, the valve switches to the stand-by mode and the
compressor works normally.
While shifting from user’s to domestic hot water, the operating sensor changes from “outlet water temp. sensor” to “sanitary
tank temp. sensor”. While shifting from the winter operating mode to the sanitary operating mode, the compressor does not stop
operation, and will be placed at the maximum established frequency which can be controlled; however, when shifting from the
summer operating mode to the sanitary operating mode, the compressor will stop operation for waiting for the safe period.
The defrost cycle during winter operation mode is always performed on the user side, never on the sanitary water tank.
Note:
−If H10 = 1/3/5, the remote shutdown of the unit (remote on-off) or from the on-board unit controller, or from the remote
control panel has no effect on sanitary operating mode. The unit will be placed in sanitary mode as setting priority after its
power on. The on-board unit display shows the temperature measured by the sensor placed inside the sanitary water tank.
Once the sanitary cycle is completed, the display turns back to show the temperature of the outlet water sensor.
−If the remote ON-OFF digital input (onoff-onoff terminals) is open, with enablement of the function of domestic hot water
(H10=1), the display on-board unit shows the code "SAN". Once the sanitary cycle is concluded, the display returns to show
the code "E00" indicating that the remote ON-OFF contact is open.

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−If H10 = 2/4/6, the remote on-off function disenables the production of domestic hot water and also the operation of the
heat pump in heating and cooling on plant side.
9.5.1 MEMORIZATION OF THE SENSOR IN HEATING MODE
In the case of commutation from water users to the domestic hot water, the temperature sensor commutates from a "water
outlet temperature sensor" to a "water tank temperature sensor". For such reason, in heating mode, the last value read by the
sensor will be memorised before changing to DHW mode.
When the DHW thermoregulation is achieved, the reference temperature on the plant side will take the value which is previously
memorised.
The memory function will be interrupted:
-When the temperature detected by the sensor becomes lower than the memorized value;
-Or after a period equal to b06 seconds (default 45 seconds).
9.5.2 SANITARY MODE CALLING FROM DIGITAL INPUT
In the case where a digital input is configured for sanitary water mode call (instead of the sensor), the system will be placed in
sanitary mode when the digital input is closed (the same behaviour is obtained when DHW temperature sensor < (G03 – Pa b03)
and exits from the DHW production when the digital input is open.
Note: If a DHW temperature sensor is installed and configured, this management will be ignored and the thermoregulation will be
done according to the temperature detected by the sensor.
I/O port – Parameter
Value
Function
H57
28
Sanitary calling from thermostat (ST6E).
H24
0
Deactivation of DHW temperature sensor
In the case where a digital input is configured for sanitary water function calling (instead of the sensor), the heat pump will be
placed in sanitary mode when the digital input is closed and exits from the DHW production when the digital input is open.
The DHW setpoint of the heat pump is not considered here, its management is the designer’s responsibility, who must take into
consideration the DHW protection and the configuration of the whole system.
Note: It is possible to invert the polarity of the digital input, to do that, please contact our technical office.
9.5.3 HEATING MODE ON DOMESTIC HOT WATER TANK
If the following setting H83=1, the unit employs the tank of domestic hot water also for plant side heating. In these conditions,
therefore the relay which controls the DHW valve which will be energized during heating operation and not only in DHW mode.
During defrost period and in cooling mode the valve will be de-energized.
9.6 SUMMER/WINTER MODE ROMOTE COMMUTATION
With the possibility of controlling remotely the heating/cooling mode operation of the heat pump unit.
To enable this function, enter at the parameters PRGPSSPRG(introduce the maintainer password)PRGPArPRGCnF
See paragraph See paragraph 11.2.
Parameter
Unit
Value
Description
Terminals
Notes
H57 Num 3
Digital input for operation mode management.
Open contact heat pump in ”heating” mode,
Close contact

unit operates in “cooling” mode.
ID3E- ID3E Voltage free digital
input
9.7 PLANT REMOTE SENSOR
In some plant solutions (e.g.: installed heat pump in parallel configuration with a boiler on the same hydronic circuit and diverter
valve) It is possible to enable a plant temperature sensor for allowing the on-board unit controller to correctly manage the
regulation.
To enable this function, enter at the parameters PRGPSSPRG(introduce the maintainer password)PRGPArPRGCnF
Parameter
Value
Description
H29
41
Enablement of the plant remote temperature sensor
The plant circuit remote sensor adjusts the heat pump temperature only during the startup period of the compressor(s), the
shutdown is managed by the outlet temperature sensor of the heat pump. For more explanation herein below is reported an
illustrating table regarding the operation of the system:
Mode of operation
Active call of the heat pump
Heating
Temperature detected by the outlet sensor of the heat pump < setpoint Hea - b05
and
Temperature detected by the plant circuit remote sensor < water setpoint Hea - (b22 - b05)
Cooling
Temperature detected by the outlet sensor of the heat pump > setpoint Coo + b05
and
Temperature detected by the plant circuit remote sensor > setpoint Coo + (b22 - b05)
Note:b05=1°C; b22=5°C.

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9.8 AUXILIARY ELECTRIC HEATER
In some configurations of some plant systems, it could be necessary the use an auxiliary electric heater for the system and/or
DHW sides.
To define the mode of using of the auxiliary electric heaters for plant system and DHW side, you must set the parameter “r24” as
below.
-r24=0 Auxiliary electric heaters not used;
-r24=1 Utilization only of the auxiliary electric heater of the plant side;
-r24=2 Utilization only of the auxiliary DHW electric heater;
-r24=3 Utilization of both auxiliary electric heaters of plant side and of domestic (sanitary) hot water production.
9.8.1 PLANT CIRCUIT AUXILIARY ELECTRIC HEATER
In alcune soluzioni impiantistiche può rendersi necessario l’utilizzo di una resistenza di integrazione per l’impianto.
If the temperature of regulation remains below the water setpoint in heating (Hea) - 0.5°C for a period of time equal to r12, the
auxiliary electric heater will be activated depending on the in joint or in substitution operation of the unit indicated in Paragraph
9.9. The electric heater turns off after reaching the setpoint (taking into account of an eventual offset set with the parameters r29
or r30 (see paragraph 9.10.6).
If the temperature of regulation remains less than water setpoint - r11(°C) and the unit is blocked that is caused by an error-
alarm, the electric heater will be activated. Then it will turn off when the lock-alarm is resolved.
In order to enable this function, you should enter into the page of parameters as follow PRGPSSPRG (insert the maintainer
password) PRG PAr PRG CnF / rE.
Parameters
Unit
Value
Description
Terminals
Notes
H81 Num 22 Plant auxiliary electric heater
(Undervoltage output)
DO3E(phase)
DO3E N(neutral)
Under voltage output 230V ac, 50Hz, 2A
(AC1), for connection to the relay coil for
obtaining a free contact
r10
Num
1
Enablement of the function
-
-
r11 °C
0.5
(default)
ΔT of the auxiliary electric heaters in
heating operation
- -
r12 Min
10
(default)
Activation delay of auxiliary E-heater - -
r24
Num
1 o 3
Type of utilization of the electric heaters
-
-
9.8.2 AUXILIARY ELECTRIC HEATER OF THE PLANT IN DEFROST CYCLE
During defrost cycle (see Paragraph 7.6), by setting r21=1 (in addition to r10=1 and r24=1 or 3) the electric heater of the plant
system side will be activated if required (regulating temperature lower than the water setpoint -r11 (°C)), without waiting for the
time defined by r12.
9.8.3 ELECTRIC HEATER OF SANITARY WATER PRODUCTION
It is an additional energy resource for the sanitary water tank heating when the compressor is not able to reach the set
temperature within a reasonable time.
In order to enable this function, please enter at the page of parameters PRGPSSPRG (insert the service password) PRG
PAr PRG CnF / rE.
Parameter
Unit
Value
Description
Terminals
Notes
H81 Num 26 Undervoltage output for
DHW auxiliary electric heater
DO7E(phase)
DO7EN(neutral)
Under voltage output 230V ac, 50Hz, 2A
(AC1), for connection to the relay coil for
obtaining a free contact
r15
Num
1
Enablement of the function
-
-
r16 Min
10
(default)
Activation delay of auxiliary
DHW electric heater
- -
r24 Num 2 or 3
Type of utilization of the
electric heaters
- -
(*) Otherwise, it is possible to use another output DO or OC.
If the production of sanitary hot water lasts for a period of time greater than r16 (minutes) and the unit stop operation because of
a fault, the electric heater will start operation and it will stop only when the unit concludes the sanitary water production. The
auxiliary electric heater of DHW can also start operation in normal heat pump mode in case of joint and substitution bands.
9.8.4 UNIQUE AUXILIARY ELECTRIC HEATER FOR BOTH PLANT SYSTEM/DHW PRODUCTION
With the following parameter setting r15=2 and by configuring the auxiliary DHW electric heater, this last could be used as a single
electric heater for sanitary production and/or plant system and/or plant system in case of defrosting cycle.
9.8.5 SELECTION MODE OF THE AUXILIARY ELECTRIC HEATERS
The activation order priority of the auxiliary electric heaters can be set for those of plant system and DHW production sides, as
particular configurations, see below:
1. r14=0 (default), the electric heaters will be activated simultaneously if were being installed;