Thermocold MEX VS 15 RH User manual

CONTROLLER MANUAL
MEX VS 15 RH / MEX VS 16 RH
MEX VS 18 RH / MEX VS 19 RH
MEX VS 112 RH /MEX VS 112T RH
MEX VS 115 RH / MEX VS 115T RH
Cod. MCO14124H7820-04
This manual has been created for informative purpose. The company declines any responsibility for the results of any projecting or any installation based on the explanations and/or on
the technical specifications provided in this manual. It is besides forbidden the reproduction under any form of the texts and of the figures contained in this manual.
"This manual is a translation from the official 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 time. In case of any dispute, the original language manual will be the trusted one".
CONTROLLER MANUAL FOR CHILLERS
AND INVERTER AIR/WATER HEAT
PUMPS WITH AXIAL FANS

Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans
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INDEX
1.1 GRAPHIC SYMBOLS........................................................................................................................................................... 3
2PERMITTED USES..................................................................................................................................................................... 3
3GENERAL SAFETY RULES..................................................................................................................................................... 3
3.1 PERSONAL SAFETY EQUIPMENT.................................................................................................................................... 3
3.2 WORKERS’ HEALTH AND SAFETY................................................................................................................................. 3
4PURPOSES AND CONTENTS OF THE MANUAL................................................................................................................ 5
5USER –CONTROLER INTERFACE....................................................................................................................................... 5
5.1 MENU STRUCTURE DIAGRAM ........................................................................................................................................ 5
5.1.1 Menu’s contents.............................................................................................................................................................. 6
5.1.2 Setpoint’s menu .............................................................................................................................................................. 6
5.1.3 Password’s menu............................................................................................................................................................ 6
5.1.4 Sensors’ menu ................................................................................................................................................................ 6
5.1.5 Alarms’ menu ................................................................................................................................................................. 7
5.1.6 Digital inputs’ menu....................................................................................................................................................... 7
5.1.7 Parameters’ menu .......................................................................................................................................................... 7
5.1.8 Operation’s hours menu................................................................................................................................................. 7
5.1.9 USB’s menu.................................................................................................................................................................... 7
5.2 USER ADJUSTABLE SET POINT....................................................................................................................................... 8
5.3 DISPLAY............................................................................................................................................................................... 8
5.4 LED........................................................................................................................................................................................ 8
5.5 INPUT/OUTPUT (I/O) PORTS ............................................................................................................................................. 8
6DYNAMIC SET-POINT ADJUSTMENT ................................................................................................................................. 9
7SET-POINT ADJUSTMENT FROM 0-10V INPUT.............................................................................................................. 10
8CIRCULATOR .......................................................................................................................................................................... 10
8.1 OPERATION BY MEAN OF THERMOREGULATOR (DEFAULT) .................................................................................. 11
8.2 OPERATION BY THERMOREGULATOR WITH PERIODIC ACTIVATION................................................................ 11
8.3 OPERATION WITH ACTIVE ELECTRIC HEATER ........................................................................................................ 12
8.4 CONTINUOUS OPERATION ............................................................................................................................................ 12
8.5 PROPORTIONAL ADJUSTMENT OF THE PUMP........................................................................................................... 12
8.6 PURGING THE SYSTEM................................................................................................................................................... 12
9HEAT DISSIPATION FAN MOTOR CONTROL................................................................................................................. 12
9.1 FAN SPEED CONTROL IN COOLING MODE................................................................................................................. 12
9.2 FAN SPEED CONTROL IN HEATING MODE ................................................................................................................. 13
10 CONTROL FUNCTIONS..................................................................................................................................................... 13
10.1 ANTIFREEZE PROTECTION ELECTRIC HEATERS (WHEN THE INTEGRATED DEFROSTING KIT ACCESSORY
IS PRESENT)................................................................................................................................................................................... 14
10.2 ACTIVATION OF SANITARY (DOMESTIC) HOT WATER PRODUCTION ................................................................ 14
10.2.1 Sensor memorization in heating mode ......................................................................................................................... 15
10.3 HEATING MODE ON SANITARY ACCUMULATION................................................................................................... 16
10.4 REMOTE FUNCTIONS...................................................................................................................................................... 16
10.4.1 ON/OFF ....................................................................................................................................................................... 16
10.4.2 Summer/Winter mode commutation ............................................................................................................................. 17
10.4.3 Sanitary mode call from digital input........................................................................................................................... 17
10.5 REMOTE SENSOR FOR THE WATER TEMPERATURE OF THE PLANT CIRCUIT................................................... 17
10.6 AUXILIARY ELECTRIC HEATER ................................................................................................................................... 17
10.6.1 Plant circuit electric heater.......................................................................................................................................... 18
10.6.2 Auxiliary electric heater of the plant in defrost cycle................................................................................................... 18
10.6.3 Electric heater of sanitary water production ............................................................................................................... 18
10.6.4 A single auxiliary electric heater for both plant system/dhw production..................................................................... 18
10.7 SELECTION MODE OF AUXILIARY ELECTRIC HEATERS ........................................................................................................... 18
10.8 MANAGEMENT OF THE CIRCULATOR WITH ACTIVE ELECTRIC HEATER .................................................................................. 19
10.9 BOILER ENABLEMENT ........................................................................................................................................................... 19
10.10 ACTIVATION OF AUXILIARY ELECTRIC HEATERS AND BOILER DURING THE JOINT AND IN SUBSTITUTION OPERATION TO THE
COMPRESSOR OF THE HEAT PUMP...................................................................................................................................................... 19
10.10.1 Operation in heat pump mode.................................................................................................................................. 20
10.10.2 In joint operation (Area I)........................................................................................................................................ 20

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10.10.3 In joint operation (Area II)....................................................................................................................................... 20
10.10.4 In substitution operation .......................................................................................................................................... 20
10.11 OPERATION AREA -ACTIVATION OF THE AUXILIARY ELECTRIC HEATER AND BOILER (PLANT CIRCUIT
WATER TEMPERATURE SENSOR IS NOT ENABLED).............................................................................................................................. 20
10.11.1 Auxiliary systems offset’s management .................................................................................................................... 24
10.12 SIGNALIZATIONS OF FUNCTIONS................................................................................................................................ 24
10.12.1 Plant’s seasonal operation mode ............................................................................................................................. 24
10.12.2 Alarm........................................................................................................................................................................ 24
10.12.3 Heat pump lockout.................................................................................................................................................... 25
10.12.4 Defrosting................................................................................................................................................................. 25
10.13 DEFROSTING CYCLE....................................................................................................................................................... 25
10.14 COMPRESSOR CRANKCASE HEATER.......................................................................................................................... 25
10.15 MAXIMUM HZ................................................................................................................................................................... 25
10.16 DOUBLE SET-POINT (WITHOUT TOUCH SCREEN REMOTE CONTROL)................................................................................ 25
10.16.1 Control settings ........................................................................................................................................................ 25
11 AVAILABLE FUNCTIONS WITH TOUCH SCREEN REMOTE CONTROL PANEL ACCESSORY ..................... 26
12 AVAILABLE FUNCTIONS WITH GI MODULE (OPTIONAL).................................................................................... 26
12.1 I/O PORTS OF THE CONTROLLER.................................................................................................................................. 26
12.2 SECONDARY CIRCULATOR/RELAUNCHING PUMP MANAGEMENT (WITH ROOM THERMOSTAT) ....................... 26
12.3 MIXING VALVE MANAGEMENT................................................................................................................................... 27
12.3.1 Set point’s determination.............................................................................................................................................. 27
12.3.2 Radiant panels circuit pump......................................................................................................................................... 27
12.3.3 Mixing valve................................................................................................................................................................. 27
12.4 SOLAR INTEGRATION MANAGEMENT ....................................................................................................................... 27
12.4.1 Activation of the solar circulator ................................................................................................................................. 27
12.4.2 Collector protection ..................................................................................................................................................... 27
12.4.3 Collector high temperature alarm................................................................................................................................ 28
12.4.4 Sanitary high temperature alarm ................................................................................................................................. 28
12.4.5 Solar discharge valve................................................................................................................................................... 28
12.4.6 Solar tank heat’s removal............................................................................................................................................. 28
12.4.7 Antifreeze...................................................................................................................................................................... 28
13 HANDBOOK.......................................................................................................................................................................... 28
14 USER’S AND INSTALLER’S ALLOWED CONFIGURATIONS................................................................................... 28
15 GLYCOL-WATER SOLUTIONS........................................................................................................................................ 34
16 ALARMS ................................................................................................................................................................................ 34
16.1 WATER FLOW SWITCH ALARM [E006] ........................................................................................................................ 34
16.2 HIGH TEMPERATURE [E018].......................................................................................................................................... 34
16.3 ANTI-FREEZING [E005].................................................................................................................................................... 34
16.4 SENSOR ALARMS [E611÷E691]....................................................................................................................................... 34
16.5 TIMEOUT INVERTER [E801] ........................................................................................................................................... 34
16.6 INVERTER [E851÷E971].................................................................................................................................................... 34
16.7 REMOTE ON/OFF [E000] .................................................................................................................................................. 34
16.8 HIGH PRESSURE [E001] ................................................................................................................................................... 34
16.9 HIGH PRESSURE FLOW SWITCH (IN SERIES WITH THE COMPRESSOR OUTLET PROBE) [E641]..................... 34
16.10 LOW PRESSURE [E002] .................................................................................................................................................... 34
16.11 DRIVER LIMITATION [E008]........................................................................................................................................... 34
16.12 4-WAY VALVE [E041]....................................................................................................................................................... 34
16.13 DOMESTIC HOT WATER PROTECTION [E042]............................................................................................................ 35
16.14 POWER SUPPLY FAILURE............................................................................................................................................... 35
16.15 USER BLOCK ALARM LIST............................................................................................................................................. 35

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CONSERVATION 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 also 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 machines.
1.1 GRAPHIC SYMBOLS
Indicates prohibited operations.
Indicates operations that can be dangerous for people and/or disrupts the correct operation of the equipment.
Electric shock hazard - 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 location of the plant, the hydraulic and electrical circuits must be established by the planting designer and must take into
account both technical requirements as well as any applicable local laws and authorized specifications.
The execution of all works must be performed by skilled and qualified personnel, competent in the existing rules in different
countries.
3GENERAL SAFETY RULES
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 manual.
3.1 PERSONAL SAFETY EQUIPMENT
During the operating and maintaining works, 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 WORKERS’ HEALTH AND SAFETY
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 their workers to respect them.

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It’s forbidden:
To remove and/or tamper with any safety device.
The access to the electrical board by unauthorized persons.
To carry out any work on the equipment under voltage.
To touch the equipment if you are not allowed.
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 whatsoever civilian or penal responsibility in case of unauthorized operations.
WARNING:
Before proceeding, you should read the user’s-installer’s 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’s supervisor and the service man have to receive suitable training for performing their tasks in safety.
The access to the electric panel is limited to authorized personnel only.
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 supply voltage’s fluctuations cannot exceed ±10% of the nominal value. If this tolerance should not be respected, please
contact our technical department.
The power supply should respect the listed limits: failing this, warranty will not be valid immediately. Before any operation on
the unit, be sure that the power supply is disconnected.
Phase, neutral and ground connections should be respected.
The power supply cables must be sized correctly. We recommend a minimum cross section of 4mm2and a maximum length of
10m.
Install upstream of each unit an adequate protection and disconnection device of the electric power with delayed
characteristic curve, with at least 3 mm contact opening and with an adequate capacity of breaking and differential protection.
The capacity of the magneto-thermic circuit breaker must conform to the electric consumption of the unit; see TECHNICAL DATA
reported in the user’s-installer’s manual accompanying the unit. (Consideration should be taken of any eventual auxiliary
electric heater).
A good grounding is required; the manufacturer is not responsible for damage caused in case of lack of good grounding.
In case of maintenance, the unit must be disconnected from the power supply, the power cable plug must be easy for pulling it
out from the power socket by the operator for having possibility to check the unit from anywhere, the plug should remain
disconnected.
Use cables that meet the regulations in force in different countries.
Be sure, after about 10 minutes of operation the screws on the power supply terminal block that are well fixed.

Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans
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Requirements before performing electrical work on the control panel:
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 provides basic information for the installation, operation and maintenance of MEX VS units.
It is addressed to machine operators and it enables them to use the equipment efficiently, even if they do 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.
The manual describes the characteristics of the equipment at the time in which it is being put on the market; therefore, it may not
include technological improvements introduced later by the company as part of its constant endeavour to enhance the
performance, ergonomics, safety and functionality of its products.
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 the manual supplied with the installed appliance.
It’s recommended to the users to follow the instructions contained in this booklet, especially those concerning the safety and
routine maintenance.
5USER –CONTROLER INTERFACE
It is used to select the operating mode, and to initialize the manual resetting alarms. The operating
mode changes as per the sequence below each time you press the Mode button:
off cool heat off
If the Domestic Hot Water (DHW) mode is enabled, the sequence is as follows:
off cool cool+sanheat heat+sanoff
During the parameters’ setting, this button can be used to go back to the previous level.
It allows you to enter into the setting menu parameters and to select the cool/summer,
heat/winter and DHW 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.
5.1 MENU STRUCTURE DIAGRAM

Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans
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Level 0 (U) = always visible
Level 1 (M) =it’s visible if you enter the maintainer (H80) or manufacturer password.
Level 2 (C) = it’s visible if you enter the constructor password.
Level 3 (A) = it’s visible only via Modbus.
5.1.1 Menu’s 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 unit is connected to Touch screen
control panel
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 if the USB flash drive is present with its files
Enter in the password’s menu and insert its “password code” in order to enable an access with a greater privilege. Note that, once
you exit completely from the menus, the password permission will be lost and you should to re-enter it in order to get access
again.
5.1.2 Setpoint’s menu
You can display and modify the different set-points.
SET-POINT
DESCRIPTION
UNIT
DEFAULT
RANGE
Coo
First set-point in the summer
°C
7.0
H03 ÷ Co2
Hea
First set-point in the winter
°C
45.0
He2 ÷ H01
*San
DHW setpoint
°C
48.0
H02 ÷ H01
Co2
Second set-point in the summer
°C
18.0
Coo ÷ H03
He2
Second set-point in the winter
°C
35.0
H02 ÷ Hea
* if the DHW function is active
5.1.3 Password’s menu
Enter and confirm the password for the desired access level. The control panel will automatically open the desired access level and
then the voices which can be enabled from this level will be visible.
5.1.4 Sensors’menu
The value of the different sensors will appear. The number of visible sensor depends on the presence or not of the I/O expansion
modules.
Particular cases:
Err = Sensor is faulty
--- = Sensor not used (no function is associated to such sensor)
tp
DESCRIPTION
Unit

Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans
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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)
*t15
Desuperheater gas temperature sensor (if present)
(°C)
*t16
Recovery temperature (if present)
(°C)
*t17
DHW temperature (if present)
(°C)
*t18
Plant water remote temperature sensor (if present)
(°C)
(*) If the “Gi”optional module is present.
5.1.5 Alarms’ menu
This menu appears only in case of alarms warning. It allows you to check all active alarms. Note that, the alarms are divided by
circuit for multi-circuit units (the ALCx label allows to enter to the alarms of the circuit number x).
5.1.6 Digital inputs’menu
You can check the status of the digital inputs as below:
0 = inactive input
1 = active input
5.1.7 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 IDENTIFICATION CODE
PARAMETER’S INDEX
VISIBILITY
Configuration
CnF
H01-
USER/INSTALLER
Compressor
CP
C01-
INSTALLER
Fan motor
Fan
F01-
INSTALLER
Alarms
ALL
A01-
INSTALLER
Regulation
rE
b01-
INSTALLER
Pump
PUP
P01-
INSTALLER
Electric heaters
Fro
r01-
INSTALLER
Defrosting
dFr
DO1-
INSTALLER
Boost and maximum Hz
LbH
L01-
INSTALLER
Electronic valve
EEV
U01-
INSTALLER
Offset
OFF
o01-
INSTALLER
Solar
SUn
S01-
INSTALLER
Mixing valve
rAd
i01-
INSTALLER
Inverter compressors
nCP
n01-
INSTALLER
Note that a certain group is visible only if there is at least a common parameter belonging to the same group and to the current
visible level.
5.1.8 Operation’s 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, you can enter into this menu only
via password.
5.1.9 USB’s menu
The available functions through the use USB flash drive that is connected to the board are indicated below.
FIRMWARE UPGRADE
You can update of the controller’s firmware in case of new versions release, this can be done by mean of a USB flash dive via its
proper port on the controller.
For the update:
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;
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.

Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans
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4. Turn ON the unit by placing the main switch in ON position;
5. Open the page of the parameters PRGPSSPRG(introduce the maintainer password)PRGUSBUPdFPRG.
The automatic firmware updating 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.
PARAMETERS’ UPDATING
You can update the parameters in case of new ones, 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 USER ADJUSTABLE SET POINT
SETPOINT
DESCRIPTION
UNIT
DEFAULT
RANGE
Coo
First setpoint in Summer
°C
7.0
H03 ÷ Co2
Hea
First setpoint in Winter
°C
45.0
He2 ÷ H01
*San
DHW Setpoint
°C
48.0
H02 ÷ H01
Co2
Second setpoint in Summer
°C
18.0
Coo ÷ H03
He2
Second setpoint in Winter
°C
35.0
H02 ÷ Hea
5.3 DISPLAY
In Normal view displays, the outlet water temperature reported to tenths of degrees, or the alarm code if at least an alarm is
active. In case of multiple alarms activation, 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.
5.4 LED
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 active
OFF if the sanitary mode is not active
FLASHING if sanitary production 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 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.
5.5 INPUT/OUTPUT (I/O) PORTS
The I/O (inputs and outputs) that can be set to enable the control functions are listed below.
In order to set the I/O please enter with service password to the parameters PRGPSSPRG (insert the service password) 
PRG Par PRG CnF.
Ports
Parameter
Terminals
Factory Setting
Description
Value
Function
ST6
H17
17.1 / 17.2
0
Not set
Programmable analog input with NTC sensor
10kΏ at 25°C β 3435.

Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans
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ST7
H18
19.1 / 19.2
0
Not set
Programmable analog input with NTC sensor
10kΏ at 25°C β 3435.
ST11
H22
22.1 (gnd)
22.2 (under voltage input)
0
Not set
Under voltage input 0-10Vdc
ID2
H46
16.1 / 16.2
0
Remote summer/winter
commutation
(See paragraph 10.4.2)
Voltage free contact digital input
To enable the function, see paragraph (See
paragraph 10.4.2)
ID3
H47
15.1 / 15.2
2
Remote on/off
(See paragraph 10.4.1)
Voltage free contact digital input
Function active by default
ID9
H53
20.1 / 20.2
0
Not set
Voltage free contact digital input
DO3
H81
6.1(phase)
6.2 (neutral)
22
Plant auxiliary E-heater
control
Under voltage output 230V ac, 50Hz, 2A (AC1)
To activate this function see paragraph 10.6.1
DO6
H84
11.1 (phase)
11.2 (neutral)
0
DHW valve control
(see paragraph 10.2)
Under voltage output 230V ac, 50Hz, 2A (AC1)
DO7
H85
14.1 (phase)
14.2 (neutral)
0
Double set point control
(See paragraph 10.15)
Under voltage output 230V ac, 50Hz, 2A (AC1)
6DYNAMIC SET-POINT ADJUSTMENT
The controller allows you to change the set-point by adding a value as a function of the outdoor air temperature sensor detection.
In this case, you need to change the values of the parameters from b08 to b14 according to the indications below (the settings are
the installer’s responsibility):
Parameters of the controller PAr->rE->
• b08 = dynamic set-point, enabled = 1/ unabled = 0.
•b09 = offset max in cooling mode operation.
• b10 = offset max in heating mode operation.
• b11 = Outdoor temperature setting in cooling mode.
• b12 = Outdoor temperature setting in heating mode.
• b13 = Temperature difference in cooling mode operation.
• b14 = Temperature difference in heating mode operation.
Curve of the set-point variation as a function of the outside temperature:
Cooling

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7SET-POINT ADJUSTMENT FROM 0-10V INPUT
Another type of setting that allows to change the set-point by adding (or subtracting) a value in function of the 0-10V analogue
input (if enabled). To enable the function, you must use the following setting H22=40, and change the values of the parameter
b15 (range 0-10), taking into account that if b20=0 input of 0-10V, if b20=1 ratiometric input type:
-b20=0 if this input is at 0 volts you will have the actual set point: set point (Coo/Hea) - b15/2.
-b20=0 if the input is at 5 volts the set point will be the set of (Coo/Hea) mode.
-b20=0 if the input is 10 volts you will have the actual set point: set point (Coo/Hea) + b15/2.
-b20=0 when the input is at 0%, the actual set point is: set point (Coo/Hea) - b15/2.
-b20=0 when the input is at 50%, the set point will be the set of (Coo/Hea) mode.
-b20=0 if the input is 100%, the actual set point is: set point (Coo/Hea) + b15/2.
The signal must be applied to the terminals 0-10V+ and 0-10V- (see the wiring diagrams).
Note: In "cooling" mode, considering that the set-point by default is set to be 7°C, the parameter (b15) should not assume any
value greater than or equal to 6 in order to prevent that the new set-point set from 0-10V input to take values below the threshold
of the antifreeze operation which is 4°C.
8CIRCULATOR
The circulating pump can be set according respecting the following operating modes:
-Thermoregulatory operation (default)
-Thermoregulatory operation with periodic activation
-Continuous operation
The circulator will switch off immediately if:
Presence of blocking pump alarm including the manual reset alarm of the flow switch;
The unit is off or in stand-by mode or when it’s switched off from remote input, the circulating pump (if is ON) will always
turn off after P02 (tenths of a minute):
Heating

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The circulator is always running if the antifreeze heaters are activated.
The circulator can be configured with the parameter P03 in order to operate independently than the compressor or under a
thermoregulatory call.
P03=0=> Continues operation in heating/cooling modes (Default),
P03=1 => Operation under thermoregulatory call
Note: If the automatic reset alarm of the flow switch is ON, the pump is anyway in operation even if the compressor is off.
Contrarily, 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 will start if the water setting temperature decreases below P04 °C (default
value 5°C), and it will be disabled if the water setting temperature increases above P04+P05 °C (the default value of P05 is 2,0°C).
The adjustment of the circulator is linear (see Paragraph 8.5).
8.1 OPERATION BY MEAN OF THERMOREGULATOR (Default)
During this operating mode (P03=1), the thermoregulator actuates the pump; after a time delay of P01 seconds from startup of
the pump, the compressor also will turn on. However, during the power off status, the pump turns off with a delay time of P02
minutes after turning off status with thermoregulator call (the turning off status is corresponding to the off status of the
compressor).
In the case of activation of the flow switch alarms with automatic reset, the pump remains still in operation even if the compressor
is stopped.
If you enable the operation of the unit from the remote "on-off" digital input (see Paragraph 10.4.1) the circulating pump will be
activated immediately for a duration of 2 minutes regardless of the on-board controller thermoregulation of the unit (the
activation of water recirculation in the plant leads to a correct activation of the thermoregulation).
8.2 OPERATION BY THERMOREGULATOR WITH PERIODIC ACTIVATION
The function is disabled if P17= 0 (default). If the pump is set to operate by thermoregulation call (P03 = 1, default), it will be
activated periodically for a time period defined by the parameter P17 (in seconds) after a counting time set by the parameter P16
(in minutes), activated when the pump is turned off for satisfied thermoregulation.
In the case of the activation of the flow switch alarm with automatic reset the pump is still operating even if the compressor is off.

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The periodic function is also interrupted in the case of the intervention of the antifreeze thermo-regulator constraining the
operation of the pump.
8.3 OPERATION WITH ACTIVE ELECTRIC HEATER
See paragraph 10.8.
8.4 CONTINUOUS OPERATION
In this operating mode is active if P03=0 (default), the pump is always running. It turns off only when the unit is in OFF status. The
pump is always ON even if automatic reset flow switch alarm is ON and even the compressor is off.
8.5 PROPORTIONAL ADJUSTMENT OF THE PUMP
The pump speed can change as a function of the temperature difference between the water inlet and the water outlet of the heat
exchanger, according to the diagram shown below, where:
P07: maximum speed of the modulating pump (%)
P08: minimum speed of the modulating pump (%)
P09: set Delta T inlet/outlet water of the modulating pump (°C)
P10: Delta modulating pump (°C)
In domestic hot water production mode, the pump will operate at the maximum speed.
Note: If the parameter r33>0, then the circulator can start operations under call also for the activation of the plant resistance
and/or sanitary mode operation, see paragraph 10.8.
8.6 PURGING THE SYSTEM
This function allows purging the system using the circulator at the maximum speed.
To enable the function:
-Control in OFF mode
-Enter into the parameters PRGPSSPRG (introduce the Maintainer password)
-Press simultaneously for 3 seconds the buttons UP and DOWN.
The circulator of the system starts operation at the maximum speed, and after 5 minutes the circulator will stop to operate.
You can manually exit from purging the system cycle 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.
9HEAT DISSIPATION FAN MOTOR CONTROL
The control of the dissipation is a function of the condensing pressure in chiller mode and it is a function of the evaporation
pressure in heat pump mode.
The adjustment of the fan speed occurs depending on the compressor operation.
9.1 FAN SPEED CONTROL IN COOLING MODE
The fan speed control in cooling mode occurs depending on the diagram shown below, where:
F08 = Pressure set to the minimum fan speed in cooling mode
F09 = Fan proportional band in cooling mode
F10 = Delta cut-off of the fan in heating/cooling mode
F11 = Cut-off hysteresis in cooling/heating mode
F14 = Pressure set to the maximum fan speed in cooling mode

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Pre-ventilation period in chiller mode: before the compressor startup, the fan starts operation for 5 seconds; the fan speed is
proportional to the condensation temperature, however, if the controller requires the cut-off during this period, the fan motor will
run at preset minimum fan speed. This function has the purpose to prevent the compressor startup at very high condensation
temperatures.
9.2 FAN SPEED CONTROL IN HEATING MODE
The fan speed control in heating mode occurs depending on the diagram shown below, where:
F17 = Pressure set for the minimum speed of the fan motor in heating mode
F18 = Fan motor proportional band in heating mode
F10 = Delta cut-off of the fan motor in cooling/heating mode
F11 = Cut-off hysteresis in cooling/heating mode
F20 = Pressure set for the maximum speed of the fan motor in heating mode
10 CONTROL FUNCTIONS
The functions that can be activated by the on-board unit controller are listed below; note that, these functions are not all
selectable at the same time.
Other values different than the default can ensure the proper operation of the unit, in case of doubt about the value that to be set
please contact our office.

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10.1 ANTIFREEZE PROTECTION ELECTRIC HEATERS (WHEN THE INTEGRATED DEFROSTING KIT ACCESSORY
IS PRESENT)
The electric heaters of water antifreeze, installed on the outer surfaces of the evaporator plates, activates even when the unit is
switched 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 outlet water sensor exceeds r02+r06 in heating mode or r03+r06 in cooling mode and in shut off condition (as
default value 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).
10.2 ACTIVATION OF SANITARY (DOMESTIC) HOT WATER PRODUCTION
To activate the hot sanitary water function, be sure to install a temperature sensor inside the tank and to connect it to the SAN-
SAN terminals (enabled as analog input).
In order to enable this function, you should enter into the page of parameters PRGPSSPRG(type the service password) 
PRGPArPRGCnF.
See paragraph 14.

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I/O Ports - Parameter
Value
Function
H10
0 (default)
Inactive function
H10=1
Function is active in heating and cooling mode.
The remote on-off function doesn’t disenable the DHW production.
H10=2
Function is active in heating and cooling mode.
The remote on-off function disenables the DHW production.
H10=3
Function is active in heating mode.
The remote on-off function doesn’t disenable the DHW production.
H10=4
Active function in heating mode.
The remote on-off function disenables the DHW production.
H10=5
Active function in cooling mode.
The remote on-off function doesn’t disenable the DHW production.
H10=6
Active function in cooling mode.
The remote on-off function disenables the DHW production.
ST6 activable via H17
H17=6
Enablement of the DHW temperature sensor.
DO7 activable via H84
H84=6
DHW valve command.
If the DHW temperature is below than the set point value (fixed at 48°C by default and adjustable by entering the PRG->Set->SAN
menu), the unit activates the sanitary valve and the compressor is set at the maximum frequency starting the modulation at one
degree before the set value and it stops at one degree after the set value. Once reached 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 (sanitary) water, the operating sensor changes from “outlet water sensor” to “sanitary
tank sensor”. While shifting from the winter operating mode to the sanitary operating mode, the compressor does not switch off,
and reaches the maximum established frequency that to be controlled; on the other hand, while shifting from the summer
operating mode to the sanitary operating mode, the compressor is switched off to wait for the safety timing.
The defrosting during winter operation mode is always performed on the user side, never on the sanitary water tank.
Note:
-If H10 = 1/3/5. Turning off the unit remotely (remote switch onoff see paragraph 10.4.1), or via the on-board controller, or with
the remote control panel does not affect the sanitary operating mode. The unit starts in sanitary mode as setting priority when it’s
powered 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 returns to show the temperature of the outlet water sensor.
If the remote ON-OFF digital input (onoff-onoff terminals) is open, with the enabling of the domestic hot water production (H10=1
and H20=6), the display on-board unit shows the item "SAN". Once the sanitary cycle is concluded, the display returns to show the
code "E00" indicating that the remote ON-OFF contact is open.
- If H10 = 2/4/6, the remote on-off function disenables the production of domestic hot water and the operations of the heat pump
in heating and cooling on plant side.
10.2.1 Sensor memorization in heating mode
In the case of commutation from water users to the sanitary water, the temperature sensor changes from a "water outlet
temperature sensor" to a "water tank temperature sensor". For such reason, in heating mode, the last value read by the outlet
temperature sensor of the heat pump will be memorized before changing to sanitary mode.
When the sanitary thermoregulation is reached, the reference temperature on the plant side will take the value which is
previously memorized.
The memory function will be interrupted:
-When the temperature detected by the sensor becomes lower than the memorized value;
-Or after duration equal to b06 seconds (default 45 seconds).

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i-HWAK4
i-HWAK4
i-HWAK4
i-HWAK4
10.3 HEATING MODE ON SANITARY ACCUMULATION
If H130=1, the appliance exploits the accumulation tank for sanitary hot water also for heating the plant side. In these conditions,
the command relay of the sanitary valve will be also energized during heating operation and not only in sanitary mode. During
defrost cycle and in cooling mode the valve will be de-energized. When H130=1, the sanitary auxiliary electric heater can be
enabled also to act as a plant auxiliary electric heater: to this purpose you should set r10=1 and r15=2 (for further settings of the
parameter r15 please see Paragraph 10.6.3); also no digital output has to be set for the auxiliary electric heater for the plant.
10.4 REMOTE FUNCTIONS
The terminal block provides the digital inputs to control the unit via external consent.
10.4.1 ON/OFF
The ON/OFF function is enabled by default via the digital input “ID3”(X15.1/X15.2 terminals).
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 machine exits from standby mode and the circulation
pump will be activated for 2 minutes.
Enabled function by default (H47=2).
I/O Ports
Function
ID3 Digital Input
Enablement of the remote On/Off function

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If the sanitary mode is active and the H10 parameter is set as:
H10 = 1, the remote on-off function has no effect on the production of domestic hot water, it turns off only the
heating/cooling operation of the heat pump on plant side (in such case the on-board unit control display shows the voice "SAN").
H10 = 2, the on-off remote function turns off the production of domestic hot water and also the heating/cooling operation
of the heat pump on plant side.
10.4.2 Summer/Winter mode commutation
This function is set by default via the digital input ID2 (X16.1/X16.2 terminals).
You can manage remotely the operating mode in heating or in cooling of the heat pump.
In order to enable this function, you should enter into parameters PRGPSSPRG(insert the service password)PRGPar
PRGCnF.
I/O Ports - Parameter
Value
Function
ID2 activable via H46
H46=3
Open Contact Heat pump in heating mode.
Closed Contact The heat pump in cooling mode.
10.4.3 Sanitary mode call from digital input
The sanitary function can be used instead of the double setpoint management.
If the domestic hot water mode operation is enabled and the parameter used to replace the temperature sensor, the activation of
the previous mode can be performed through the opening/closing of a digital input of the unit. This function is recommended in
case of utilization of two or more MEX VS units in cascade configuration and linked through a hydronic connection to the same
accumulation tank of domestic hot water; in this way the activation of the domestic hot water function will be selected through
the sensor of the accumulation tank that is connected to the first unit, while the other units will be automatically enabled by a
digital consent.
The system goes in domestic hot water mode when the digital input closes and quits this mode when the digital input opens.
In order to enable this function, you should enter into the parameters’ page PRGPSSPRG (insert the service password) 
PRG PAr PRG CnF.
I/O Ports - Parameter
Value
Function
H75
H75=256
Digital inputs polarities
ID9 activable via H53
H53=28
Closed contact Heat pump in DHW mode.
Open contact Heat pump in heating or cooling mode of
the environment (plant system mode).
-In the case where a digital input is configured for DHW function call (instead of the sensor), the heat pump will be placed in
DHW mode when the digital input is closed and exits from the DHW production when the digital input is open.
-The SAN setpoint of the heat pump is not taken in consideration, the management of such setpoint is entrusted to the designer
of the plant, who must take into account the domestic hot water protection and the configuration of the whole system.
Note: You can reverse the polarity of the digital input, placing the maintainer (service) parameter to be H75 = 0.
10.5 REMOTE SENSOR FOR THE WATER TEMPERATURE OF THE PLANT CIRCUIT
In some systems’ configurations (example: heat pump in parallel with a boiler on the same hydronic circuit and with a diverter
valve of exclusion) it could be necessary to enable a plant temperature sensor to allow the on-board controller to correctly process
the management.
In order to enable this function, please enter into the page of parameters PRGPSSPRG (insert the maintainer password) 
PRG PAr PRG CnF.
I/O Ports - Parameter
Value
Description
“ST7”analog input activable via H18
H18=41
To enable 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 concerning the operation process of the system:
Operating mode
Heat pump enablement calling
Heating
Temperature measured by outlet sensor of the heat pump < setpoint Hea - b05
and
Temperature measured by plant circuit remote sensor < water setpoint Hea - (b22 - b05)
Cooling
Temperature measured by the outlet sensor of the heat pump > setpoint Coo + b05
and
Temperature measured by plant circuit remote sensor > setpoint Coo + (b22 - b05)
Note: b05=0.2°C; b22=5°C. See paragraph 14.
10.6 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

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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 active;
-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.
10.6.1 Plant circuit electric heater
If the regulating temperature remains below the water setpoint in heating (Hea) - 0.5°C for a period of time equal to r12, the
auxiliary electric heater will start operation according to the in joint or in substitution operation of the unit, see Paragraph 10.11.
The electric heater will stop operation after reaching the setpoint (taking into account of an eventual offset which could be set
with the parameters r29 or r30.
If the regulating temperature remains less than water setpoint - r11(°C) and the unit is blocked because of an error-alarm, the
electric heater will be activated. Then it will stop operation when the error-alarm is resolved.
In order to enable this function, you should enter into the page of parameters as follow PRGPSSPRG (insert the service
password) PRG PAr PRG CnF / Fro.
I/O Ports - Parameter
Value
Function
r10
1
Enablement of the function
r11
0.5°C (default)
Delta of the auxiliary electric heaters in heating operation
r12
10 minutes (default)
Activation delay of auxiliary heating element of the plant side
r24
r24=1 or 3
Type of utilization of the electric heater
“DO3”active by default
H81=22
Plant auxiliary electric heater
10.6.2 Auxiliary electric heater of the plant in defrost cycle
During the defrosting cycle, see paragraph 10.12.2 (by setting r21=1 in addition to r10=1 and r24=1 or 3) the electric heater of the
plant system side will start to operate if required (when the regulating temperature is lower than the water setpoint - r11 (°C)),
without waiting for the duration defined by r12.
In order to enable this function, please enter into the page of parameters as follow, press PRGPSSPRG(then insert the
maintainer password) PRG PAr PRG Fro.
10.6.3 Electric heater of sanitary water production
This function can be activated instead of using the plant electric heater.
It is an additional heating energy source for the sanitary water tank when the compressor is not able to reach the set temperature
within a reasonable duration of time.
If the production of sanitary hot water remains for a period of time greater than r16 (minutes) and the unit gets blocked due to an
alarm intervention, the electric heater will be enabled. It turns off when the unit concludes the sanitary water production (taking
into account also of any offset adjusted by the parameters r31 as described in the Paragraph 10.11.1.)
In order to enable this function, please enter into the page of parameters PRGPSSPRG (insert the service password) 
PRG PAr PRG Fro.
I/O Ports - Parameter
Value
Function
r15
r15=1
Enablement of the function
r16
r16=10 minutes
(default)
Activation delay of the auxiliary DHW heating element
r24
r24=2/3
Type of electric heaters utilization
“DO3”active by default
H81=26
Plant side auxiliary electric heater
Note: The DHW function should be active (see paragraph 10.2)
10.6.4 A single auxiliary electric heater for both plant system/dhw production
By configuring the auxiliary electric heater for DHW production, you can use such declared electric heater, also as an auxiliary
electric heater for the plant system by selecting the following setting r15=2 andr24=3.
When the auxiliary electric heater of the plant system is activated, the declared DHW electric heater will be activated allowing you
to get one auxiliary electric heater for DHW production, plant system and defrosting operation.
In order to enable the function, you should enter into the page of parameters as follow: PRGPSSPRG (then insert the
service password) PRG PAr PRG Fro.
10.7 Selection mode of auxiliary electric heaters
It is possible to set the order priority of the activation of the of the plant system and of the DHW production sides’auxiliary
electric heaters as in the below configurations:
r14=0 (default), the electric heaters will be activated simultaneously if they are present;
r14=1, the electric heaters will be activated one excludes the other:
r20=0, the priority is for the plant (the sanitary heater will operate only if the thermoregulation for the heater of

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plant side is accomplished);
r20=1, the priority is for the sanitary (the electric heater of the plant system side will operate only if the
thermoregulation of the sanitary heater is accomplished).
10.8 Management of the circulator with active electric heater
It is possible to activate the circulator of the heat pump when the plant system and/or the DHW auxiliary electric heaters are
active in the absence of compressors operations (for substitution, for alarm or for integration in band II or III).
For enabling this function, you should enter into the parameters as follow: press PRGPSSPRG (then insert the maintainer
password) PRG PAr PRG Fro:
r33 = 0: The circulator of the heat pump will be activated upon request of the compressors or by the boiler.
r33 = 1: The circulator of the heat pump will be activated if the plant circuit electric heater is active.
r33 = 2: The circulator of the heat pump will be activated if the DHW electric heater is active.
r33 = 3: The circulator of the heat pump will be activated if the plant system electric heater or if the DHW electric heater is
active.
The circulator will stop operation after the post-pumping (P02).
10.9 Boiler enablement
This function can be activated instead of using the plant electric heater.
It is an additional energy source which enables the boiler in integration or in substitution of the heat pump.
To activate this function, you should enter into the parameters as follow: press PRGPSSPRG(then insert the maintenance
password)PRGPArPRGCnF/Fro:
Definition of the type of using of the auxiliary systems by setting the parameter r23:
-r23=0 (default) boiler not used (priority of intervention is for electric heaters);
-r23=1 boiler used just on plant side (priority of intervention is for electric heaters);
-r23=2 boiler used just for DHW hot water (priority of intervention is for electric heaters);
-r23=3 (default) boiler used for both DHW hot water and plant sides (priority of intervention is for electric heaters);
-r23=4 boiler used only for plant side with priority (no intervention priority for electric heaters);
-r23=5 boiler used only for DHW hot water with priority (no intervention priority for electric heaters);
-r23=6 boiler used on both DHW and plant sides with priority (no intervention priority for electric heaters);
Settings of the parameter r32 for boiler equipment:
-r32 = 0: boiler without a circulating pump with thermoregulation to be performed by the heat pump unit.
-r32 = 1: boiler equipped with independent circulating pump with thermoregulation to be performed by the heat pump unit.
-r32 = 2: boiler without circulating pump with independent thermoregulation.
-r32 = 3: boiler equipped with a circulating pump with independent thermoregulation.
I/O Ports - Parameter
Value
Function
r10
1
Activation of the plant auxiliary electric heater
r12
10 minutes(default)
Activation delay of the plant auxiliary electric heater
r15
1
Activation of the DHW electric heater
r16
10 minutes (default)
Activation delay of the auxiliary DHW electric heater
r23
1÷6
Boiler’s type utilizzation
r32
1÷3
Boiler endowment
“DO3”activable via H81
H81=29
Activation of the boiler
10.10 Activation of auxiliary electric heaters and boiler during the joint and in substitution operation to
the compressor of the heat pump
The available auxiliary systems for the joint operation or substitution operation are as below:
- Boiler
- Plant auxiliary electric heater
-DHW (Sanitary) auxiliary electric heater
Considering the heating and sanitary mode of operation, you have 4 types of operation:
Heat pump
Tout .[°C]
r22=7
r28=-7
r08=-20
0Heat pump + [Boiler and/or electricheater]
[Boiler and/or electricheater]
Boiler + [Heat pump and/or electricheater]
IN JOINT OPERATION I
IN JOINT OPERATION II
IN SUBSTITUTION OPERATION