MAXA i-32V5C MIDI 0121 User manual

www.maxa.it
R32
i-32V5C MIDI 0121
i-32V5C MIDI 0126
i-32V5C MIDI 0128
i-32V5C MIDI 0132
i-32V5H MIDI 0121
i-32V5H MIDI 0126
i-32V5H MIDI 0128
i-32V5H MIDI 0132
Chillers and Inverter Air/Water heat pumps with axial fan
Controller Manual
This manual has been created for informave purpose. The company declines any responsibility for the results of any projecng or any installaon based on the
explanaons and/or on the technical specicaons provided in this manual. It is besides forbidden the reproducon under any form of the texts of the gures
contained in this manual. This manual is a translaon from the ocial italian language version. For reasons of environmental respect the Company will not provide
the hard copy in the original language which could be directly requested or downloaded from the Company website at any me. In case of any dispute, the original
languate manual will be the trusted one. Even paral reproducon PROHIBITED © Copyright - Advanx SpA
Model

Controllo per i-32V5 MIDI Air/water inverter chillers and heat pumps with axial fans
2
00 01-2021 EM AR First emission
Rev Date Compiled Approved Note
Code Serie
MCO01040101001.00 Chillers and Inverter Air/Water heat pumps with axial fan

3
Controllo per i-32V5 MIDI Air/water inverter chillers and heat pumps with axial fans
Sommario
1.PURPOSE AND CONTENT OF THE MANUAL....................................................................... 6
1.1 HOW TO KEEP THE MANUAL ....................................................................................... 6
1.2 GRAPHIC SYMBOLS USED IN THE MANUAL................................................................. 6
2. PERMITTED USE................................................................................................................. 6
3. GENERAL SAFETY GUIDELINES........................................................................................... 6
3.1 PERSONAL PROTECTIVE EQUIPMENT .......................................................................... 7
3.2 WORKERS' HEALTH AND SAFETY ................................................................................. 7
3.3 SAFETY SIGNALS .......................................................................................................... 7
3.4 REFRIGERANT SAFETY DATA SHEET ............................................................................. 7
4. USER INTERFACE - CONTROLLER ....................................................................................... 7
4.1 DISPLAY........................................................................................................................ 8
4.1.1 KEYS.......................................................................................................................... 8
4.1.2 LED............................................................................................................................ 8
4.2 MENU .......................................................................................................................... 9
4.3 SETPOINT MENU [Set]................................................................................................. 9
4.4 PASSWORD MENU [PSS].............................................................................................. 9
4.5 ALARMS MENU [Err].................................................................................................... 9
4.6 PROBES MENU [tP]...................................................................................................... 9
4.7 DIGITAL INPUTS MENU [Id]........................................................................................ 10
4.8 PARAMETERS MENU [Par] ......................................................................................... 10
4.9 OPERATING HOURS MENU [oHr]............................................................................... 10
4.10 LOG MENU [HiSt]..................................................................................................... 10
4.11 FIRWARE VERSION MENU [Fir]................................................................................ 10
4.12 USB MENU[USB]...................................................................................................... 10
4.12.1 FIRMWARE UPDATE [UPdF] .................................................................................. 10
4.12.2 PARAMETERS UPDATE [UPPA] .............................................................................. 10
5. SYSTEM RESOURCES........................................................................................................ 11
6. EDITING DYNAMIC SET-POINT ......................................................................................... 11
7. SET-POINT MODIFICATION FROM ANALOGUE INPUT ..................................................... 12
8. CIRCULATOR .................................................................................................................... 12
8.1 CONTINUOUS OPERATION......................................................................................... 13
8.2 OPERATION ON CALL BY TEMPERATURE CONTROLLER ............................................. 13
8.3 OPERATING ON CALL BY TEMPERATURE CONTROLLER WITH PERIODIC ACTIVATION ...13
8.4 OPERATION WITH INTEGRATION RESISTOR ACTIVE .................................................. 13
8.5 ANTIFREEZE HYDRAULIC PUMP OPERATION ............................................................. 13
8.5.1 PROPORTIONAL REGULATION ................................................................................ 13
8.6 SYSTEM VENTING ...................................................................................................... 14
9. COMPRESSOR ON/OFF LOGIC ......................................................................................... 14
9.1 REGULATION IN COOLING MODE .............................................................................. 14
9.2 REGULATION IN HEAT MODE..................................................................................... 15
10.FAN ................................................................................................................................ 15
10.1 SILENCED VENTILATION........................................................................................... 15
11.COMPRESSOR CRANKCASE RESISTENCE........................................................................ 15
12.ENABLING DOMESTIC HOT WATER PRODUCTION......................................................... 15

Controllo per i-32V5 MIDI Air/water inverter chillers and heat pumps with axial fans
4
12.1.1 MEMORISING THE PROBE IN HEATING MODE ..................................................... 16
12.1.2 HEATING MODE ON DHW STORAGE TANK ........................................................... 16
13.REMOTE FUNCTION....................................................................................................... 16
13.1 ON/OFF.................................................................................................................... 16
13.2 SUMMER/WINTER MODE CHANGE......................................................................... 16
13.3 DHW CALL FROM DIGITAL INPUT ............................................................................ 17
13.4 SYSTEM WATER REMOTE PROBE ............................................................................. 17
14.DEFROSTING CYCLE ....................................................................................................... 17
15.DOUBLE SET-POINT........................................................................................................ 17
16.MINIMUM HZ FUNCTIONS ............................................................................................ 17
17.MINIMUM HZ FUNCTIONS ............................................................................................ 18
18.AUXILIARY RESISTANCES................................................................................................ 18
18.1 SYSTEM RESISTANCE................................................................................................ 18
18.2 SANITARY RESISTANCE............................................................................................. 18
18.3 INDIVIDUAL SYSTEM/HEALTH INTEGRATION RESISTENCE....................................... 18
18.4 INTEGRATION RESISTANCE SELECTION MODE......................................................... 19
18.5 CIRCULATOR MANAGEMENT WITH ACTIVE RESISTANCE......................................... 19
18.6 BOILER ENABLING ................................................................................................... 19
18.7 LOGIC OF INTEGRATION HEATERS AND/OR BOILER IN JOINT OPERATION OR IN SUB-
STITUTION OF THE HEAT PUMP COMPRESSOR .................................................................. 19
18.8 OPERATION HEAT PUMP MODE .............................................................................. 20
18.9 JOINT OPERATION (I BRACKET)................................................................................ 20
18.10 JOINT OPERATION (II BRACKET)............................................................................. 20
18.11 OPERATION IN SUBSTITUTION............................................................................... 20
18.12 OPERATING BANDS ............................................................................................... 21
18.13 AUXILIARY SYSTEMS OFFSET MANAGEMENT........................................................ 23
19.ANTIFREEZE PROTECTION RESISTANCES (IF KA ACCESSORY IS PRESENT)......................24
20.PARTIAL RECOVERY WITH DESUPERHEATER (IF DS ACCESSORY IS PRESENT) ................24
21.LOGICS THAT CAN BE ACTIVATED WITH GI MODULE - SYSTEM MANAGEMENT (ACCESSO-
RY) ...................................................................................................................................... 24
22.PERMITTED CONFIGURATION TABLES ........................................................................... 24
23.ALARMS......................................................................................................................... 27
23.1 [E006] FLOW SWITCH .............................................................................................. 27
23.2 [E018] HIGH TEMPERATURE .................................................................................... 27
23.3 [E005] ANTIFREEZE.................................................................................................. 27
23.4 [E611÷E681] PROBE ALARMS OR PRESSOSTAT........................................................ 27
23.5 [E691÷E701] TRANSDUCER ALARMS....................................................................... 28
23.6 [E801] INVERTER TIMEOUT ..................................................................................... 28
23.7 [E851 ÷E971] INVERTER ALARMS ............................................................................ 28
23.8 [E00] REMOTE ON/OFF SIGNALLING ....................................................................... 28
23.9 [E001] HIGH PRESSURE............................................................................................ 28
23.10 [E002] LOW PRESSURE .......................................................................................... 28
23.11 [E008] DRIVER LIMITATION.................................................................................... 28
23.12 [E041] 4-WAY VALVE .............................................................................................. 28
23.13 [E042] DOMESTIC HOT WATER SANITARY.............................................................. 28

5
Controllo per i-32V5 MIDI Air/water inverter chillers and heat pumps with axial fans
23.14 LACK OF VOLTAGE.................................................................................................. 28
23.15 UTILITIES BLOCK ALARM TABLE ............................................................................. 28
24.MODBUS VARIABLES ..................................................................................................... 29

Controllo per i-32V5 MIDI Air/water inverter chillers and heat pumps with axial fans
6
1. PURPOSE AND CONTENT OF THE MANUAL
The purpose of the control manual for i-32 MIDI units is to provide the essenal informaon necessary for the correct use of all the funcons
of the machine, in parcular, it provides the essenal informaon for the setup of unit control. The informaons contained in this manual are
wrien for the installer and for the user who uses the machine: the user, even if he does not have specic informaon, will nd in these pages
the indicaons that will allow him to use it eecvely. It is reccomended that the user carefully follows the instrucons given in this manual,
especially the safety instrucons and roune maintenance. The manual describes the machine at the me it was commercialised; the Company
reserves the right to make changes and tecnological improvements to the product and it is not obliged to update manual of previous versions.
Besides, the Company declines all responsability for any errors contained in the manual, if due to prinng or transcripon errors. Be sure to use
the manual, in case of updates or doubts contact the company.
HOW TO KEEP THE MANUAL
The manual has to always be kept together with the unit it refers to. It has to be stored in a safe place, protected from dust and moisture and
easily accessible to the operator who must consult it any me he is in doubt on how to operate the equipment. Any updates sent to the customer
must be kept in an aachment to this manual. The company is available to give any detailed informaon about this manual and to give informa-
on regarding the use and the maintenance of the units.
GRAPHIC SYMBOLS USED IN THE MANUAL





2. PERMITTED USE
• The company excludes all contractual and extra-contractual liability for damage caused to persons, animals or things, due to installaon,
adjustment and maintenance errors, improper use or paral or supercial reading of the informaon contained in this manual.
• These units are built for the heang and/or cooling of water. Any other use not expressaly authorised by the manufacturer is considered
improper and therefore not allowed.
• Modicaon of the operang logic and/or control parameters must be executed by experienced and qualied personnel. Access to the
electrical panel and the connecon of external devices are only permied to qualied personnel.
• This appliance is intended to be used by experienced or trained operators in shops, light industry and on farms, or for commercial use by
non-experted personnel.
• The appliance may be used by children at least 8 years old and by persons with reduced physical, sensory or mental capabilies or without
experience or the necessary knowledge as long as they are supervised or aer they themselves have received instrucons on the safe use
of the appliance and understand the relevant dangers. Children must not play with the appliance. The cleaning and maintenance which the
user is expected to carry out on the unit cannot be done by children without supervision.
• Direct interacon with the unit by personnel with electrically controlled medical devices, such as pacemakers, is prohibited, because it may
cause harmful interference. It is reccomended to mantein an appropriate distance from the installaon site of the unit, as indicated by the
medical system used.
3. GENERAL SAFETY GUIDELINES
Before starng any type of operaon on the unit, every user and operator must have perfect knowledge of operaon of the machine and of its
controls and have read all of the informaon in this manual and in the user-installer manual.

7
Controllo per i-32V5 MIDI Air/water inverter chillers and heat pumps with axial fans
IS PROHIBITED:

Unauthorised access to the electrical panel.
To touch the systems if not autorised to do so.


To step on, sit down on and/or place any type of object on the appliance.
To spary or pour water directly on the appliance.
To touch the appliance when barefoot or part of the body are wet or damp.
-
lease the manufacturer from any civil or criminal responsibility.
CAUTION:








set contact the company.

personnel.
-
trical power.







PERSONAL PROTECTIVE EQUIPMENT
Refer to the user-installer manual included with the unit.
WORKERS' HEALTH AND SAFETY
Refer to the user-installer manual included with the unit.
SAFETY SIGNALS
Refer to the user-installer manual included with the unit.
REFRIGERANT SAFETY DATA SHEET
Refer to the user-installer manual included with the unit.
4. 
The unit has a 4-digit display with integrated keypad, the main funcons and menu navigaon are described below. Normally, if the unit is
switched on, the display shows the water outlet temperature in degrees Celsius or the alarm code, if acve.

Controllo per i-32V5 MIDI Air/water inverter chillers and heat pumps with axial fans
8
DISPLAY
KEYS
Select the operang mode and manually reset any alarms.
Each me you press the key you have the following sequence:
OFF -> COOL -> COOL+SAN* -> HEAT -> HEAT+SAN* -> OFF (*= if sanitary is enabled)
During parameter seg has the funcon of the back key.
Allows to enter the selected menu to view the sub-folders or to set a value (e.g. summer, winter and domesc set-points or various
parameters).
UP key allows to move to a higher menu or to increase the parameter value.
DOWN key allows to move to a lower menu or to decrease the parameter value.
LED
Cooling mode LED: is on if COOL or COOL+SAN mode is selected.
Heang mode LED: is on if HEAT or HEAT+SAN mode is selected.
Pump Led: is on if the pump is acve.
Alarm Led: is on if there are acve alarms.
Defrosng Led: ashes to enter defrosng mode, it is on when defrosng is in progress.
Compressor Led: ashes if the compressor is starng up, it is on if the compressor is acve.
Sanitary led: ashes if sanitary producon is in progress, it is on if COOL+SAN or HEAT+SAN mode is selected and sanitary produc-
on is not in progress.
Led KA resistors: is on if the anfreeze resistors are acve.

9
Controllo per i-32V5 MIDI Air/water inverter chillers and heat pumps with axial fans
MENU
The items controlled by the main menu are listed below. Some of this are only visible to the installer, who must access to the PSS menu to enter
the password and enable higher privilege access.
MENU LABEL LEVEL OTHER CONDITIONS
Setpoint Set User Not accessible if connected at Hi-T2
Password PSS User ---
Alarms Err User Only if acve alarms
Probes tP Installer ---
Digital inputs Id Installer ---
Parameters Par Installer ---
Hours of oper-
aon oHr Installer ---
Alarm log Hist Installer Only of the log contains data
Firmaware
Version Fir Installer ---
USB USb Installer Only with USB key with update les is present

Set
In this menu, it is possible to display and modify the various set-points.
Set DESCRIPTION DEFAULT RANGE UNIT
Coo First Summer setpoint 7.0 5 ÷ Coo2 °C
Hea First Winter setpoint 45.0 Hea2 ÷ 60 °C
*San Sanitary setpoint 48.0 25 ÷ 60 °C
Coo2 Second Summer setpoint 18.0 Coo ÷ 25 °C
Hea2 Second Winter setpoint 35.0 25 ÷ Hea °C
(*) If sanitary funcon is enabled, see par. 12.

Enter the password for the desired access level. Conrming the value with the PRG key automacally acvates the access level and the menu
items enabled by that level will appear. Once you have exited the menus completely, the password privilege is lost and must be entered again.
Err
This menu allows you to see all acve alarms, if any. For more details see par. 9.
tP
Entering with the installer password, the values of the present temperature and pressure sensors can be read in this menu.
tP DESCRIPTION UNIT
t01 Water inlet temperature °C
t02 Water outlet temperatura °C
t03 Compressor sucon temperature °C
t04 Compressor discharge temperature °C
t05 Outside air temperature °C
t06 Domesc hot water temperature (if enabled) °C
t07 System remote probe temperature (if enabled) °C
t09 Low pressure bar
t10 High pressure bar
The number of visible probes depends on the presence or absence of expansion modules.
Parcular situaons:
Err: probe faulty
--- = probe not used (no funcon associated to that probe)

Controllo per i-32V5 MIDI Air/water inverter chillers and heat pumps with axial fans
10
Id
Entering with the installer password, the status of the digital inputs can be view in this menu:
0 = input disabled
1 = input enabled
--- = input not congured

Par
Entering with installer password, in this menu you can modify the the main parameters of the unit. The parameters are collected in groups, each
group is idened by a three-digit code, while the index of each parameter is preceded by a leer.
Par DESCRIPTION INDEX OF THE PARAMETER
CnF Conguraon H--
ALL Alarms A--
CP Compressor C--
rE Regulaon b--
PUP Pump P--
Fro Electrical resistances r--
dFr Defrosng d--
LbH Minimum Hz L--
rEC Desuperheater rE
oHr
Entering with the installer password this menu displays the operang hours of the compressor (oH1) and of the circulator (oHP1).
It is possible to reset the displayed count by pressing the ESC key for 3 seconds
HiSt
This menu appears, aer entering the installer password, only if there is data in the alarm log.
Fir
Entering with the installer password, in this menu you can read rmware version (uEr), revision (rEu) and sub-revision (SUb).

This menu appears, aer entering the installer password, only if a USB key containing the relevant update les is connected to the card. The
available funcons are described below.
CAUTION: The access to the electrical panel is only allowed to QUALIFIED PERSONNEL.
FIRMWARE UPDATE [UPdF]
In case of rmware update, the following steps are necessary:
1. Copy the upgrade les into the main directory of a USB pen;
2. Set the unit to OFF on the keypad and remove power by seng the main switch to OFF;
3. Insert the ash drive into the USB port on the control;
4. Power up the unit, seng the mains witch to the ON posion;
5. Access the rmware update menu and start the procedure through the following sequence: PRG -> PSS -> PRG -> (enter installer password)
-> PRG -> USB -> UPdF -> PRG
6. A countdown advances on the display, at the end of the procedure the word "boot" appears and the 4 LEDs light up in sequence;
7. Switch o the unit, posioning the main switch on the OFF status;
8. Remove the drive from the USB port;
9. Switch the unit on by turning the main switch to the ON posion.
PARAMETERS UPDATE [UPPA]
In case of parameters update, the following steps are necessary:
1. Copy the upgrades les into the main directory of a USB pen;
2. Set the unit to OFF on the keypad and remove power by seng the main switch to OFF;
3. Insert the ash drive into the USB port on the control;

11
Controllo per i-32V5 MIDI Air/water inverter chillers and heat pumps with axial fans
4. Power up the unit, seng the mains witch to the ON posion;
5. Access the rmware update menu and start the procedure through the following sequence: PRG -> PSS -> PRG -> (enter installer password)
-> PRG -> USB -> UPPA -> PRG
6. A countdown advances on the display, at the end of the procedure the word "boot" appears and the 4 LEDs light up in sequence;
7. Remove the drive from the USB port;
8. Switch the unit on by turning the main switch to the ON posion.
5. SYSTEM RESOURCES
The inputs and outputs (I/O) that can be set to acvate the control funcons are listed below. To congure the I/O, use the installer password to
access the conguraon parameters: PRG -> PSS -> PRG -> (enter installer password) -> PRG -> PAr -> PRG -> CnF.
Resource Parameter 


Default
value 
ST6 H17 XC-5.1
XC-5.2 0Not set Analogue input congurable with an NTC-10kΏ
probe at 25°C β 3435
ST7 H18 XC-6.1
XC-6.2 0Not set Analogue input congurable with an NTC-10kΏ
probe at 25°C β 3435
ST11 H22 XC-10.1 (GND) XC-10.2 (+)
XC-11.2 (5V) 0Voltage input 0-10 Vdc input (XC-10.1/2)
Raometric / PWM input
DI2 H46 XC-4.1
XC-4.2 0Remote summer/winter mode
change Voltage free digital input. To acvate the funcon see par.13.2
DI3 H47 XC-3.1
XC-3.2 2Remote on/o Voltage free digital input. Acve funcon by default
(par. 13.1).
DI9 H53 XC-7.1
XC-7.2 0Not set Voltage free digital input
DO3 H81 XP-1.1 (N)
XP-1.2 (phase) 22 System integraon heater com-
mand Voltage output 230Vac, 50Hz, 2A (AC1) (see paragraph 18)
DO6 H84 XP-4.1 (N)
XP-4.2 (phase) 6 HDW valve control Voltage output 230Vac, 50Hz, 2A (AC1)
(see paragraph 12)
DO7 H85 XP-5.1 (N)
XP-5.2 (phase) 25 Double setpoint valve control Voltage output 230Vac, 50Hz, 2A (AC1)
(see paragraph 15)
Modbus
RTU RS485 -- XC-1.1 (GND)
XC-2.1 (R-)
XC-2.2 (R+) -- -- Factory enabled with CM accessory
For a detailed descripon of the terminal block, please refer to the user/installer manual.
6. 
The regulaon control allows you to modify the set-point by adding an oset value depending on the outside air temperature. To use this func-
on, modify the values of the regulaon parameters, from b08 to b14, following the informaon in this paragraph.PRG -> PSS -> PRG -> (enter
installer password) -> PRG -> PAr -> PRG -> rE
Parameters of regulator:
• b08 = 1 to enable the dynamic set-point / b08 = 0 to disable the dynamic set-point (default)
• b09 = maximum cooling oset
• b10 = maximum heang oset
• b11 = Cooling outdoor temperature seng
• b12 = Heang outdoor temperature seng
• b13 = Cooling temperature delta
• b14 = Heang temperature delta
Edit the setpoint depending on the outdoor temperature:
HEATING COOLING
Set temp. ext
b12
b10
b14
Delta <0 Delta >0
Temp.
ext
Temp.
set
Offset >0
Hea
Set temp. ext
b12
b10
b14
Delta <0 Delta >0
Temp.
ext
Temp.
set
Offset >0
Hea

Controllo per i-32V5 MIDI Air/water inverter chillers and heat pumps with axial fans
12
EXAMPLE: consider that we want to obtain the following condions in heang mode:
• set-point of 28°C with external temperature of 18°C
• set-point of 45°C with external temperature of 2°C
Set Hea = 28 e b08 = 1, while the other parameters will be calculated as follows:
• b10 = 45 – 28 = 17
• b12 = 18
• b14 = 2 – 18 = -16
EXAMPLE: consider that we want to obtain the following condions in cooling mode:
• set-point of 12°C with external temperature of 25°C
• set-point of 7°C with external temperature of 35°C
Set Coo = 12 e b08 = 1, while the other parameters will be calculated as follows:
• b09 = 7 – 12 = -5
• b11 = 25
• b13 = 35 – 25 = 10
7. 
Another type of regulaon allows the set-point to be modied by adding (or subtracng) a value according to the voltage input ST11. To enable
this funcon it is necessary to connect the signal between the terminals indicated in chapter 5 and set the parameter H22 = 40. To use this func-
on, change the values of the following control parameters:
• b15 = Maximum decalibraon value
• b20 = 0 for input type 0-10 V (default)
• b20 = 1 for raometric input
Correcon calculaon with input 0-10 V (b20=0):
• With input at 0 Volt the current set-point will be: set (Coo/Hea) – b15/2
• With 5 Volt input the set-point will be the one set (Coo/Hea)
• With an input at 10 Volt the current set-point will be: set (Coo/Hea) + b15/2
SETPOINT FROM ANALOGUE INPUT
Input 0-10V
Ra�ometric input
Temp.
set
Coo/Hea
Coo/Hea + b15/2
Coo/Hea
-
b15/2
0 V
0 %
5 V
50 %
10 V
100 %
Correcon calculaon with raometric input (b20=1):
• With input at 0% the current set-point will be: set (Coo/Hea) – b15/2
• With input at 50% the set-point will be that set (Coo/Hea)
• With input at 100% the current set-point will be: adjusted set (Coo/Hea) + b15/2



8. CIRCULATOR
The circulator of the unit can be set in the following operang modes. To congure the circulator is necessary to access the relevant parameter.
PRG -> PSS -> PRG -> (insert installer password) -> PRG -> PAr -> PRG -> PUP
The circulator can be congured to operate independently of the compressor or on call:
• P03 = 0 for connuous operaon (default)
• P03 = 1 for operaon on thermoregulator call

13
Controllo per i-32V5 MIDI Air/water inverter chillers and heat pumps with axial fans
NOTE:




CONTINUOUS OPERATION
The factory conguraon of the unit is for connuous operaon (P03 = 0). In this mode, the circulator is only switched o with the unit in OFF,
in all other cases it is on. When the unit goes into stand-by, the circulator is switched o with a delay that can be set by parameter P02 in tenths
of a minute (default P02 = 20, i.e. 2 minutes).
OPERATION ON CALL BY TEMPERATURE CONTROLLER
Subsequently, the compressor is also switched on, aer a delay me of P01 seconds (default P01 = 30) since the pump was switched on. In the
switch-o phase, the pump is switched o with a delay me of P02 minutes (default P02 = 2) from the switch-o of the compressor.
OPERATION ON CALL FROM TEMPERATURE CONTROLLER
Temperature controller
ON
OFF
�me
Compressor
�me
Pump
�me
P01
P02
ON
OFF
ON
OFF
OPERATING ON CALL BY TEMPERATURE CONTROLLER WITH PERIODIC ACTIVATION
With P03 = 1, you can also congure the circulator to run periodically according to the following parameters:
• P16 = Periodic acvaon me interval (in minutes)
• P17 = Pump acvaon me (in seconds)
In pracce, when the pump is turned o for sased thermoregulaon, the countdown dened by parameter P16 begins and at each interval of
me P16 the circulator is turned on for a me equal to P17 seconds.
The funcon is disabled with P17 = 0 (default). The periodic funcon is suspended in the case of anfreeze mode intervenon.
OPERATION WITH INTEGRATION RESISTOR ACTIVE
If parameter r33 > 0, the circulator can also be switched on when the system and/or sanitary heang element is acvated.
ANTIFREEZE HYDRAULIC PUMP OPERATION
In this mode, the circulator is always on. Anfreeze operaon is enabled if the control temperature falls below P04 (default P04 = 5.0°C), it is
disabled if the control temperature rises above P04 + P05 °C (default P05 = 2.0°C).
PROPORTIONAL REGULATION
In cooling or heang mode, the speed of circulator changes depending on the temperature dierence between the inlet water and outlet water
of the heat exchanger according to the diagram below, where:
• P06 = Set ΔT water inlet/outlet in heang mode (default P06 = 4,0°C)
• P07 = Maximum speed (100%)
• P08 = Minimum speed
• P09 = Set ΔT water inlet/outlet in cooling mode (default P09 = 2,0°C)
• P10 = Modulang pump Delta (default P10 = 3,0°C)

Controllo per i-32V5 MIDI Air/water inverter chillers and heat pumps with axial fans
14
PROPORTIONAL REGULATION
ΔT
[°C]
Speed
[%]
P07
P08
P06/P09
P10
In pracce, in cooling mode, if the temperature dierence between the inlet and outlet is greater than P09 + P10, the circulator runs at maximum
speed, but if the dierence is less than P09 - 0.2°C, it runs at minimum speed; in the remaining cases, the pump modulates the speed propor-
onally. In heang mode, the same consideraons apply, replacing parameter P06 with parameter P09.
In sanitary producon the circulator always runs at maximum speed.
SYSTEM VENTING
The control allows the use of a manual system venng funcon with the circulator at maximum speed.
To enable the funcon the operaons to follow are:
• Set unit to OFF
• Access with maintenance privilege PRG -> PSS -> PRG -> (enter installer password) -> PRG
• Press UP and DOWN simultaneously for 3 seconds.
It is possible to exit the system venng cycle manually by pressing the MODE/ESC buon,or by pressing UP and DOWN keys simultaneously for
3 seconds.

water inside the system.
9. COMPRESSOR ON/OFF LOGIC
The restart of compressors is in operaon of a set point refered to the inlet and outlet water temperature. It is based on calculaon of  that
is the dierence between outlet and inlet water temperatures, detected while the compressor for thermoregulaon is turning o.
REGULATION IN COOLING MODE
• Tw,out,set = setpoint in cooling mode
•  = Tw,out,set – Tw,in,set
• b05 = compressor delta cut-o set = 0,2°C (default)
• b25 = delta cut-on regolazione compressor set = 2°C
RPM
Tw,out (outlet water temp.)
Tw,out,set
HzMaxReg
OFF
HzMin
b05
∆T,set + b25

15
Controllo per i-32V5 MIDI Air/water inverter chillers and heat pumps with axial fans
• The compressor shutdown is set by the parameter b05: the compressor shutdown when Tw,out < Tw,out,set - b05
• The compressor restart when : se , the compressors restart when the discharge
probe temperature is lower than the setpoint 10°C:
REGULATION IN HEAT MODE
• Tw,out,set = seng setpoint in heat mode
•  = Tw,out,set – Tw,in,set
• b05 = compressor regulaon delta cut-o = 0,2°C (default)
• b25 = compressor regulaon delta cut-on= 2°C
RPM
Tw,out (outlet water temp.)
Tw,out,set
HzMaxReg
OFF
HzMin
b05
∆T,set + 2°C
• The compressor shutdown is regulated by parameter b05: the compressor shutdown when 
• The compressor restart when 
EXCEPTION: if    , the compressors restart when the discharge probe temperature is lower than the setpoint 10°C:

10. FAN
The unit's fan is controlled depending on the operaon of the compressor. Venlaon is controlled according to the condensing pressure in
cooling mode or according to the evaporang pressure in heang mode. Pre-venlaon takes place every me the compressor is switched on
and o.
SILENCED VENTILATION
Conguring a digital input DI9 with parameter H53=25 it is possible to manage the funcon of silent venlaon management.
Parameter VALUE 
H53
0 (default) Funcon disabled
25 Open contact -> standard mode
Close contact -> silenced mode
With the funcon acve, the noise, output and power of the unit are limited, for addional informaon see the installer user manual.
11. COMPRESSOR CRANKCASE RESISTENCE
The crankcase resistence is acvated if the compressor has been o for at least 30 minutes and if the temperature measured by the discharge
probe is below 20 °C (with a hysteresis of 2.0 °C). When the compressor restarts, the crankcase resisitence is disabled.
12. ENABLING DOMESTIC HOT WATER PRODUCTION
To enable the producon of domesc hot water it is necessary to connect a probe to the analogue input ST6 to be posioned inside the tank (the
relave terminals are indicated in chapter 5 or on the electrical diagram). Once the DHW temperature probe has been posioned and connected,
it must be enabled by seng parameter H17 = 6.
The DHW valve must be connected to digital output DO6 (see Chapter 5), and the relave control must also be enabled with parameter H84 =
6 (default).
The domesc hot water (DHW) funcon is controlled through parameter H10:
Parameter VALUE 
H17 6 DHW temperature probe
H84 6 DHW valve control

Controllo per i-32V5 MIDI Air/water inverter chillers and heat pumps with axial fans
16
Parameter VALUE 
H10
0 (default) Funcon disabled
1Funcon acve in heang and cooling mode.
The remote on/o funcon does not disable DHW producon.
2Funcon acve in heang and cooling mode.
The remote on/o funcon disables DHW producon.
3Funcon acve only in heang mode
The remote on/o funcon disable DHW producon.
4Funcon acve only in heang mode
The remote on/o funcon disable DHW producon
5 Funcon acve only in cooling mode
The remote on/o funcon not disable DHW producon
6Funcon acve only in cooling mode
The remote on/o not disable DHW producon
If the DHW temperature is lower than the DHW set (set to 48°C by default), the machine acvates the DHW valve and the compressor is set to
the maximum frequency, starng the modulaon one degree before the set and switching o one degree aer the set. Once the set point has
been reached, the valve returns to rest mode and the compressor starts to regulate normally. Switching from winter operaon to domesc hot
water operaon, the compressor does not switch o, while switching from summer operaon to domesc hot water operaon the compressor
is switched o to wait for the safety me.
If H10 = 1/2/3, switching the unit o remotely (remote on/o, see paragraph 13.1) does not aect the DHW operaon
If H10 = 2/4/6, the remote on/o funcon disables domesc hot water producon and operaon of the unit in heang or cooling mode.

MEMORISING THE PROBE IN HEATING MODE
When switching from the system to DHW, the reference probe changes from "water outlet probe" to "DHW probe". The display on the machine
shows the temperature read by the probe located inside the DHW tank; once the DHW cycle is over, the display returns to show the water outlet
temperature. In heang mode, before entering DHW mode, the last value read by the ow probe of the heat pump is memorised. Once the DHW
temperature control is sased, the reference temperature on the system side returns to the previously memorised one.
La funzione di memoria si interrompe:
• when the temperature read by the probe becomes lower than the stored value;
• or a me equal to b06 seconds has elapsed (default b06 = 45).
HEATING MODE ON DHW STORAGE TANK
If parameter H130 = 1, the machine also uses the DHW storage tank for heang on the system side. Under these condions, the DHW valve
output is also acve during hot operaon. The valve is deacvated during defrosng and in cold mode. In this mode (H130 = 1) it is possible to
make the domesc hot water integraon resistor also act as integraon resistor on the system side.le to make the DHW integraon resistor also
act as an integraon resistor on the plant side.
13. REMOTE FUNCTION
The terminal block has digital inputs to control the unit via an external consent (see chapter "5. SYSTEM RESOURCES").
ON/OFF
The funcon is enabled by default on digital input DI3 (parameter H47 = 2), to acvate it, the electrical bridge must be removed from the terminal
block. With the contact open, the unit will be in stand-by mode, in this state the message E00 will appear on the display on the machine. When
the contact is closed, the machine comes out of stand-by and the circulator is acvated for 2 minutes.
The funcon is disabled by reinserng the electrical bridge or seng parameter H47 = 0.

SUMMER/WINTER MODE CHANGE
The control oers the possibility to remotely manage the operang mode of the machine in heang or cooling mode.
The funcon can be set on digital input is seable DI2 via parameter H46:
Parameter VALUE 
H46
0 (default) Funcon disabled
3Open contact -> cooling mode
Clesd contact -> heang mode
The polarity of the digital input DI2 can be reversed by seng H75 = 2.

17
Controllo per i-32V5 MIDI Air/water inverter chillers and heat pumps with axial fans
DHW CALL FROM DIGITAL INPUT
If DHW operaon is enabled and parameter H51 = 28, is set, as an alternave to using the DHW temperature probe (H17 = 0), the DHW funcon
can be acvated by closing/opening digital input DI7. The unit goes into DHW mode when the contact closes and exits DHW producon when
the contact opens.
The polarity of digital input ID7 can be inverted by seng H75 = 64.

This funcon is recommended when using two or more heat pumps in cascade, hydronically connected to the same domesc hot water storage
tank. In this case, the acvaon of the domesc hot water funcon can be set on the rst machine via the DHW probe of the tank, while the
other machines are automacally enabled thanks to the consent given by the digital input.


SYSTEM WATER REMOTE PROBE
In some system soluons (e.g.: heat pump in parallel with the boiler on the same hydronic circuit and exclusion diverter valve) it may be neces-
sary to enable a temperature probe of the system so that the on-board control can process the management correctly. The system remote probe
is acvated by seng parameter H18 = 41.
The system remote probe thermoregulates the heat pump only during the compressor start-up phase, the switch-o is managed by the probe
on the heat pump delivery.
In heang mode, the call is acve if the following condions are veried:
• Flow probe temperature < ;
• Temperature of the system remote probe <  (default b22 = 5,0°C).
In cooling mode the call is acve if the following condions occur
• Flow probe temperature > ;
• Temperature of the system remote probe >  (default b22 = 5,0°C).
14. DEFROSTING CYCLE
The defrost cycle is a funcon acve only in heat pump mode and is used to prevent the formaon of ice on the surface of the nned coil. The
formaon of ice on the evaporator, which occurs more frequently at very low external ambient temperatures, not only considerably reduces the
thermodynamic eciency of the machine, but also leads to the risk of damage to the machine itself.

15. 
This funcon introduces a second working set-point on the plant side, both in cooling and heang mode.
The user terminal board allows a consent to be connected to switch from the rst to the second set-point and congured at digital input DI9 with
parameter H53 = 26. The valve,on the other hand, is connected in the terminal board to digital output DO7 and is congured via parameter H85.
Parameter VALUE 
H53 26 Call for second set-point
H85 25 3-way valve for radiant panels
H129
0Funcon disabled
1Funcon congured but not acve
2Enabled only in cooling mode
3Enabled only in heang mode
4Enabled in cooling and heang mode
16. MINIMUM HZ FUNCTIONS
Conguring parameter L02=1 and L03≠0 reduces the nominal operang Hz of the compressor.

Controllo per i-32V5 MIDI Air/water inverter chillers and heat pumps with axial fans
18
Parameter VALUE 
L02 0Funcon not acve
1Enable Hz minimum
L03
0Funcon not acve
1Funcon acve only in cooling mode
2Funcon acve only in heang mode
3Funcon acve only in sanitary mode
4Funcon acve in cooling and sanitary mode
5Funcon acve in heang and sanitary mode
6Funcon in cooling and heang mode
7Funcon always acve
With the funcon acve, the output and power of the unit are limited, for addional informaon see the installer user manual.
17. MINIMUM HZ FUNCTIONS
When the funcon is acvated, the power of the unit is increased, for informaon contact the company.
18. AUXILIARY RESISTANCES
In some system soluons it may be necessary to use an integraon heater for the system and/or for the sanitary area. This is an addional re-
source for heang in case the compressor cannot meet the set in a reasonable me. The resistor controller only operates in heang mode and
if r10 = 1.
To dene how the integraon resistors are to operate, parameter r24 must be se:
• r24 = 0 for integraon resisitors not used;
• r24 = 1 for use of system integraon resisitor;
• r24 = 2 for use of sanitary integraon resisitance;
• r24 = 3 for use of both the system integraon resistor and the sanitary integraon resistor.
SYSTEM RESISTANCE
The system resistance must be connected to the digital output DO3 and can be congured by seng parameter H81 = 22.
If the regulaon temperature remains lower than the hot water set-point  (°C) for a me equal to r12 the integraon resistor is acvat-
ed according to the operaon of the machine in the combined or replacement bands.
The resistor is also acvated if the control temperature remains below the water set-point  (°C) and the machine is in lockout due to
the intervenon of an alarm. It switches o when the machine exits the alarm block.
Seng r21 = 1, during the defrost cycle, if required (temperature lower than Hea - r11), the system resistor is acvated without waing for the
me dened by r12.
The resistor switches o when the set-point is reached (also taking into account any oset set with parameters r29 or r30).
Parameter VALUE 
H81 22 System integraon resistance
r10 1Enabling of system resistors
r11 5 (default) Delta resistances in system integraon (in tenths of °C)
r12 10 (default) System integraon acvaon delay (in minutes)
r21 1Enabling resistors during defrosng
r24 1/3 Type of use resistors
SANITARY RESISTANCE
This funcon can be acvated as an alternave to the system integraon resistance. The DHW resistance must be connected to digital output
DO3 and can be congured by seng parameter H81 = 26, in addion the DHW funcon must be acve.
The resistance is acvated if the producon of domesc hot water lasts longer than r16 (minutes) or if the machine goes into lockout due to
the intervenon of an alarm. It switches o when the machine nishes DHW producon (also taking into account any oset on the set-point set
with parameter r31).
Parameter VALUE 
H81 26 DHW integraon resistor
r15 1Enabling of DHW resistors
r16 10 (default) Sanitary integraon acvaon delay (in minutes)
r24 2/3 Type of use of resistance
INDIVIDUAL SYSTEM/HEALTH INTEGRATION RESISTENCE
Conguring the DHW resistance it is also possible to use it as a system resistor, by seng the parameter r15 = 2 and r24 = 3.
In this way, in the event of a request for system integraon, the resistance declared as DHW integraon is acvated, thus making it possible to
have a single integraon resistance for the system, DHW and defrosng.

19
Controllo per i-32V5 MIDI Air/water inverter chillers and heat pumps with axial fans
INTEGRATION RESISTANCE SELECTION MODE
The resistors can be acvated simultaneously if r14 = 0 (default), otherwise the priority of the order of acvaon of the system-side and DHW-
side integraon resistors can be set, in parcular the conguraons are:
• r14 = 1 for resistance acvaon in exclusion of each other;
• r20 = 0 for system priority (the domesc heang element is acvated only if the system-side thermoregulaon is sased);
• r20 = 1 sanitary priority (the system resistor is acvated only if the thermoregulaon on the sanitary side is sased).
CIRCULATOR MANAGEMENT WITH ACTIVE RESISTANCE
The circulator of the heat pump can be acvated when the plant and/or DHW integraons resistences are acve with the compressors not run-
ning (by substuon, by alarm or by integraon in bracket II or III):
• r33 = 0 for acvaon on request of the compressors or for any boiler request.
• r33 = 1 for acvaon with system resistance acve.
• r33 = 2 for acvaon with sanitary heang element acve.
• r33 = 3 for acvaon with system or sanitary resistor acve.
The circulator switched o aer post-pumping (P02).
BOILER ENABLING
Funcon which can be acvated instead of managing the double setpoint.
This is an addional resource to enable the boiler in integraon or substuon of the heat pump.
The relave digital output for enabling the boiler is DO7, it can be congured by seng parameter H85 = 29.
Dene the mode of use by seng parameter r23:
• r23 = 0 (default) for boiler not used (priority of resistor intervenon);
• r23 = 1 for boiler use on system only (priority of resistor intervenon);
• r23 = 2 for boiler use only in DHW mode (priority intervenon of the heaters);
• r23 = 3 per ulizzo caldaia sia in sanitario sia su impianto (priorità di intervento delle resistenze);
• r23 = 4 for boiler use in DHW and on system (priority intervenon of resistors);
• r23 = 5 for boiler use only in DHW mode with priority;
• r23 = 6 for boiler use in DHW mode and on system with priority;
Dene the boiler equipment by seng parameter r32:
• r32 = 0 for boiler without circulator with thermoregulaon charged to the heat pump
• r32 = 1 for boiler with autonomous circulator with thermoregulaon charged to the heat pump
• r32 = 2 for boiler without circulator with autonomous thermoregulaon
• r32 = 3 for boiler equipped with circulator with autonomous thermoregulaon
Parameter VALUE 
H81 29 Boiler enabling
r10 1Enabling in system integraon
r12 10 (default) System integraon acvaon delay (in minutes)
r15 1Enabling of sanitary integraon
r16 10 (default) DHW integraon acvaon delay (in minutes)
r23 1 ÷ 6 Type of boiler use
r32 1 ÷ 3 Boiler equipment
LOGIC OF INTEGRATION HEATERS AND/OR BOILER IN JOINT OPERATION OR IN SUB
STITUTION OF THE HEAT PUMP COMPRESSOR
The auxiliary parts that can be used for joint or for operaon in substuon are:
• boiler
• system integraon resistor
• domesc hot water integraon resistor
The parameters to be considered for adjusng this operang logic are:
• r22 = set for joint operaon with heat pump priority
• r28 = set for joint operaon with priority of auxiliary units
• r08 = set for replacement operaon
Considering the heang and/or DHW operang modes, there are 4 operang areas:

Controllo per i-32V5 MIDI Air/water inverter chillers and heat pumps with axial fans
20
INTEGRATION LOGIC
r22
Heat pump + Boiler/Heater
JOINT OPERATION I ZONE
Boiler + Heat pump/Heater
JOINT OPERATION II ZONE
Boiler/Heater
OPERATION IN SUBSTITUTION
Heat pump
STANDARD WORKING
r28
r08
Outside
temp.
If it is necessary to change the values of the parameters, the formula  must be followed.
Seng r22 = r28 it is possible to eliminate the zone relave to joint operaon 1st band; by seng r28 = r08 it is possible to eliminate the zone
relave to joint operaon 2nd band; by seng r22 = r28 = r08 it is possible to eliminate both bands relave to joint operaon.
The intervenon priories of the auxiliary heaters are dened by parameters r14, r20, r23, r24 (as described above).

OPERATION HEAT PUMP MODE
Normal operaon of the heat pump in which the integraon heaters and-or the boiler only intervene when a heat pump alarm is triggered.

If the outdoor temperature is between r22 and r28, the compressor operates in synergy with the auxiliary heaters in winter or DHW mode. In
this operang bracket, rst the heat pump is acvated and aer r12 minutes the plant side auxiliary heaters, or aer r16 minutes the sanitary
side auxiliary heaters.
Operaon returns to normal if the outside temperature is greater than  °C.
Note: In the joint operaon band, the boiler is thermoregulated by the system water remote probe (if acve), in parcular if the temperature
detected by the remote probe is lower than the Hea setpoint,the boiler is acvated, and then deacvated when the temperature detected by
the remote probe is higher than Hea setpoint. The heat pump is also thermoregulated by the system water remote probe (as described above).
If the remote system water probe is not acve, the boiler is controlled by the ow probe of the heat pump.

If the outside temperature is between r28 and r08, the auxiliary heaters are enabled in combinaon with the heat pump in heang or DHW
mode. In this operang range, the boiler is acvated rst, then the heat pump and auxiliary heaters are acvated aer a me dened by r12
minutes for the system side or aer r16 minutes for the DHW sanitary.
Operaon returns to normal if the temperature rises above  °C.
Note: In the joint operaon band, the boiler is thermoregulated by the remote system water probe (if acve), in parcular if the temperature
detected by the remote probe is lower than the Hea setpoint,the boiler is acvated, and then deacvated when the temperature detected by
the remote probe is higher than Hea setpoint. The heat pump is also thermoregulated by the system water remote probe (as described above).
If the remote system water probe is not acve, the boiler is controlled by the ow probe of the heat pump.
OPERATION IN SUBSTITUTION
If the outside temperature falls below r08 the heat pump compressor is disabled and the auxiliary devices operate in place of it. The compressor
is enabled again if the temperature rises above  (default r09 = 1.0 °C).
If the auxiliary system consists of system and/or DHW resistors, they operate according to the mes dened by parameters r12 (minutes) for the
system side and r16 (minutes) for the DHW side. In the substuon operaon band, it is not necessary to enable the integraons with r10 or r15
since the resistances must operate as a replacement for the heat pump (it is therefore sucient to select the type of use from parameter r24).
If the auxiliary system is a boiler with autonomous thermoregulaon (r32 = 2 or 3),it is enabled independently of the thermoregulaon of the
heat pump.
If the replacement auxiliary system is a boiler without a circulator (r32 = 0 or 2), the heat pump circulator is acve when the boiler is enabled.
If the auxiliary system is a boiler with its own circulator (r32 = 1 or 3), the heat pump circulator is switched o and aer P01 (default 30 seconds)
the boiler is enabled.