MAXA HWA1-A 0140 User manual

AIR/WATER CHILLERS AND HEAT PUMPS
WITH AXIAL FANS
CONTROLLER MANUAL
Models
HWA1-A / HWA1-H 0140
HWA1-A / HWA1-H 0147
HWA1-A / HWA1-H 0260
HWA1-A / HWA1-H 0272
HWA1-A / HWA1-H 0285
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.

HWA1-A Air/water chillers with axial fans
1
INDICE
1CONSERVATION OF THE MANUAL.......................................................................................................................................... 3
1.1 GRAPHIC SYMBOLS USED IN THE MANUAL ........................................................................................................................................ 3
2PERMITTED USES ................................................................................................................................................................... 3
3GENERAL SAFETY GUIDELINES................................................................................................................................................ 3
3.1 PERSONAL PROTECTION EQUIPMENT............................................................................................................................................... 3
3.2 HEALTH AND SAFETY OF WORKERS.................................................................................................................................................. 3
4PURPOSES AND CONTENTS OF THE MANUAL......................................................................................................................... 4
5USER –ONBOARD CONTROLLER INTERFACE .......................................................................................................................... 5
5.1 LED ......................................................................................................................................................................................... 5
5.2 MENU’S STRUCTURE DIAGRAM ...................................................................................................................................................... 6
5.3 MENU ...................................................................................................................................................................................... 6
5.3.1 Setpoint menu ................................................................................................................................................................ 6
5.3.2 Password menu .............................................................................................................................................................. 6
5.3.3 Sensors menu ................................................................................................................................................................. 6
5.3.4 Alarms menu .................................................................................................................................................................. 7
5.3.5 Digital inputs menu ........................................................................................................................................................ 7
5.3.6 Parameters menu ........................................................................................................................................................... 7
5.3.7 Operation’s hours menu ................................................................................................................................................. 7
5.3.8 USB menu ....................................................................................................................................................................... 7
5.4 USER ADJUSTABLE SET-POINTS....................................................................................................................................................... 8
6MANAGEMENT OF COMPRESSORS ........................................................................................................................................ 8
6.1 COOLING MODE.......................................................................................................................................................................... 8
6.2 HEATING MODE.......................................................................................................................................................................... 8
6.3 DOMESTIC HOT WATER MODE ....................................................................................................................................................... 9
6.4 SAFE TIME PERIODS ..................................................................................................................................................................... 9
6.5 DEACTIVATION OF COMPRESSORS FOR OUTDOOR TEMPERATURE .......................................................................................................... 9
7DYNAMIC SET-POINT CONTROL ............................................................................................................................................. 9
7.1 SET-POINT ADJUSTMENT FROM 0-10V INPUT ................................................................................................................................... 9
7.2 CALCULATION OF THE CORRECTION WITH 0-10V INPUT.................................................................................................................... 10
7.3 CALCULATION OF THE CORRECTION WITH RATIOMETRIC INPUT ........................................................................................................... 10
7.3.1 Settings for standard climatic curves ........................................................................................................................... 10
8CIRCOLATOR MANAGEMENT ............................................................................................................................................... 11
8.1 AIR PURGING OF THE SYSTEM ...................................................................................................................................................... 11
8.2 OPERATION BY MEAN OF THE THERMOREGULATOR (DEFAULT)........................................................................................................... 11
8.3 OPERATION UNDER THERMOREGULATOR CALL WITH PERIODIC ACTIVATION........................................................................................... 12
8.4 HYDRAULIC PUMP IN ANTI-FREEZING OPERATION............................................................................................................................. 12
8.5 CONTINUOUS OPERATION........................................................................................................................................................... 12
8.6 LINEAR REGULATION OF THE CIRCULATOR –DOUBLE ΔTWATER –........................................................................................................... 12
8.7 MANAGEMENT OF DOUBLE CIRCULATOR........................................................................................................................................ 13
9FAN MOTOR CONTROL......................................................................................................................................................... 13
9.1 AC FAN MOTOR........................................................................................................................................................................ 13
9.2 STAR-DELTA (Y-∆) FAN MOTOR................................................................................................................................................... 13
9.3 EC FAN MOTOR CONTROL........................................................................................................................................................... 13
10 DEFROSTING CYCLE MANAGEMENT ................................................................................................................................. 14
10.1 FORCED MANUAL DEFROST ......................................................................................................................................................... 14
11 ANTIFREEZE PROTECTION ELECTRIC HEATERS (IF THE KA ACCESSORY IS PRESENT) .......................................................... 14
12 REMOTE ON/OFF CONTROL.............................................................................................................................................. 15
13 SIGNALIZATIONS FOR HWA1-A MODELS .......................................................................................................................... 15
13.1 MACHINE LOCKOUT SIGNALIZATION.............................................................................................................................................. 15
14 OTHER CONTROL FUNCTIONS WITH THE PLANT MANAGEMENT GI-MODULE (OPTIONAL)............................................... 15

HWA1-AAir/water chillers with axial fans
2
14.1 FREE-COOLING ......................................................................................................................................................................... 15
14.1.1 Ventilation in freecooling ............................................................................................................................................. 16
14.2 ENABLEMENT OF DOMESTIC HOT WATER PRODUCTION (DHW).......................................................................................................... 16
14.2.1 MEMORIZATION OF THE SENSOR IN HEATING MODE ................................................................................................. 17
14.2.2 SANITARY MODE CALL FROM DIGITAL INPUT .............................................................................................................. 17
14.2.3 REGOLATOR IN COOLING ............................................................................................................................................. 17
14.2.4 REGULATOR IN HEATING.............................................................................................................................................. 17
14.2.5 SANITARY VALVE REGULATOR...................................................................................................................................... 17
14.2.6 HEATING MODE ON DOMESTIC HOT WATER TANK ..................................................................................................... 18
14.3 SUMMER/WINTER MODE ROMOTE COMMUTATION.......................................................................................................... 18
14.4 PLANT REMOTE CONTROL (MANAGEMENT)........................................................................................................................ 18
14.5 DOUBLE SET-POINT MANAGEMENT..................................................................................................................................... 18
14.5.1 SETTINGS ...................................................................................................................................................................... 18
14.5.2 ADJUSTABLE SETPOINTS............................................................................................................................................... 19
14.5.3 COMMUTATIONS.......................................................................................................................................................... 19
14.6 MANAGEMENT OF ASECONDARY CIRCULATOR (RELAUNCHING PUMP)............................................................................. 19
14.6.1 ANTIFREEZE CONTROL OF PLANT SECONDARY PUMP ................................................................................................. 19
15 SIGNALIZATIONS’ MANAGEMENT .................................................................................................................................... 19
16 HANDBOOK FOR SOME CONFIGURATIONS OF INSTALLATION.......................................................................................... 20
17 TABLES OF ALLOWED CONFIGURATIONS FOR THE USER AND INSTALLER......................................................................... 20
17.1 SETPOINT CONFIGURATION PARAMETERS .......................................................................................................................... 20
17.2 CONFIGURATION PARAMETERS........................................................................................................................................... 20
17.3 CONFIGURATION PARAMETERS OF THE ALARMS ................................................................................................................ 20
17.4 SETTING PARAMETERS......................................................................................................................................................... 21
17.5 CONDENSATION PARAMETERS ............................................................................................................................................ 21
17.6 COMPRESSOR PARAMETERS’ CONFIGURATION .................................................................................................................. 21
18 USER AND INSTALLER ALLOWED CONFIGURATION TABLES .............................................................................................. 21
18.1 SET-POINT’S CONFIGURATION PARAMETERS ...................................................................................................................... 22
18.2 CONFIGURATION PARAMETERS........................................................................................................................................... 22
18.3 ALARM CONFIGURATION PARAMETERS .............................................................................................................................. 22
18.4 SETTING PARAMETERS......................................................................................................................................................... 22
18.5 CONDENSATION PARAMETERS ............................................................................................................................................ 22
18.6 CIRCULATOR PUMP CONFIGURATION PARAMETERS........................................................................................................... 23
18.7 DEFROSTING PARAMETERS.................................................................................................................................................. 23
18.8 COMPRESSOR CONFIGURATION PARAMETERS ................................................................................................................... 23
18.9 CONFIGURATION PARAMETERS OF “GI” MODULE –PLANT MANAGEMENT –(OPTIONAL)...................................................... 23
19 ALARMS MANAGEMENT .................................................................................................................................................. 23
19.1 E000 –REMOTE ON/OFF ...................................................................................................................................................... 23
19.2 E001 –HIGH PRESSURE ........................................................................................................................................................ 23
19.3 E002 –LOW PRESSURE......................................................................................................................................................... 24
19.4 E003 –COMPRESSOR (C1) THERMAL PROTECTION.............................................................................................................. 24
19.5 E013 –COMPRESSOR (C2) THERMAL PROTECTION.............................................................................................................. 24
19.6 E004 –FAN MOTOR THERMAL PROTECTION........................................................................................................................ 24
19.7 E005 –ANTIFREEZE ALARM.................................................................................................................................................. 24
19.8 E006 –FLOW SWITCH ALARM .............................................................................................................................................. 24
19.9 E009 –HIGH DISCHARGE TEMPERATURE ............................................................................................................................. 24
19.10 E016 USAGE PUMP 1THERMAL PROTECTION...................................................................................................................... 24
19.11 E026 USAGE PUMP 2THERMAL PROTECTION...................................................................................................................... 24
19.12 E018 –HIGH TEMPERATURE ................................................................................................................................................ 24
19.13 E042 –POOR HEAT EXCHANGE ............................................................................................................................................ 24
19.14 E101 -I/O MODULE COMMUNICATION TIMEOUT ............................................................................................................... 24
19.15 [E611÷E682] TEMPERATURE SENSORS’ ALARM................................................................................................................... 25
19.16 POWER FAILURE................................................................................................................................................................... 25
19.17 ALARMS’ LIST........................................................................................................................................................................ 25
20 MODBUS VARIABLES........................................................................................................................................................ 25

HWA1-A Air/water chillers with axial fans
3
1CONSERVATION OF THE MANUAL
The manual has to be always kept for future reference. It has to be stored in a safe place, away from dusts and moisture. It has to
be available and accessible to all users who shall consult it any time they are in doubt on how to operate the equipment.
The company reserves the right to modify its products and related manuals without necessarily updating previous versions of the
reference material. It declines also any responsibility for possible inaccuracies in the manual if due to printing or transcription
errors.
The customer shall store any updated copy of the manual or parts of it delivered by the manufacturer as an attachment to this
manual.
The company is available to give any detailed information about this manual and to give information regarding the use and the
maintenance of its own units.
1.1 Graphic symbols used in the manual
Indicates prohibited operations.
Indicates operations that can be dangerous for people and/or disrupts the correct operation of the equipment.
Hazardous electrical voltage - risk of electric shock
Indicates important information that the operator has to follow in order to guarantee the correct operation of the
equipment in complete safety. It indicates also general notes.
2PERMITTED USES
The company excludes any contractual and extra contractual liabilities for damages caused to persons, animals or objects,
by incorrect installation, setting and maintenance, improper use of the equipment, and the partial or superficial reading of the
information contained in this manual.
These units have been designed only for heating and/or cooling water. Any other use not expressly authorized by the
manufacturer is considered improper and therefore not allowed.
The execution of all works must be performed by skilled and qualified personnel and competent in the existing rules in the
country in which the appliance will be installed.
3GENERAL SAFETY GUIDELINES
Before beginning to operate on the units every user has to be perfectly knowledgeable about the functions of the equipment and
its controls and has to have read and understood the information listed in the user’s-installer’s and control manuals.
3.1 Personal protection equipment
When operating and maintaining the unit, it is required to use the following personal protective equipment.
Protective clothing: Maintenance men and operators have to wear protective clothing that complies with the
basic safety requirements currently in force. In case of slippery floors, users have to wear safety shoes with non-
slip soles.
Gloves: During maintenance or cleaning operation protection gloves have to be used.
Mask and goggles: Respiratory protection (mask) and eye protection (goggles) should be used during
cleaning and maintenance operations.
3.2 Health and safety of workers
The European Community has adopted a number of directives on workplace’s health and safety, which include 89/391/CEE,
89/686/CEE, 2009/104/CE, 86/188/CEE and 77/576/CEE directives. Every employer shall implement such provisions and ensure
that the workers respect them:
It’s forbidden:
To remove and/or tamper with any safety device.
The use of the appliance by children or unassisted disabled persons.
To touch the appliance when barefoot or parts of the body are wet or damp
To clean the unit when the power is ‘ON’.
To pull, remove or twist the electrical cables coming out from the unit.
To step with your feet on the appliance, sit down and/or place any type of object.
To spray or pour water directly on the unit.
To dispose of, abandon or leave within reach of children packaging materials (cardboard, staples, plastic
bags, etc.) as they may represent an environmental and health hazards.
To tamper with or replace parts of the equipment without the specific consent of the manufacturer. The
manufacturer shall have no responsibility whatsoever in case of unauthorized operations.

HWA1-AAir/water chillers with axial fans
4
WARNING:
Before proceeding, you should read the user’s-installer manual accompanying the appliance.
All the operations described below must be carried out only by QUALIFIED PERSONNEL.
The wiring to the terminal block must be performed by qualified personnel.
Any routine and/or not-routine maintenance operation shall be carried out when the equipment has been shut
down, disconnected from electric power supply.
Do not put neither your hands nor insert screwdrivers, spanners or other tools into moving parts of the
equipment.
The equipment supervisor and the maintenance man have to receive suitable training for the performance of
their tasks in safety.
The access to the electric panel is limited only for authorized personnel.
Operators have to know how to use personal protective devices and have to know the accident-prevention
guidelines contained in national and international laws and norms.
The operator’s workplace has to be kept clean, tidy and free from objects that may prevent free movements.
Appropriate lighting of the work place shall be provided so as to allow the operator to carry out the required
operations safely. Poor or too strong lighting can cause risks.
Ensure that the work places are always adequately ventilated and that aspirators are working, in good
condition and in compliance with the requirements of the laws in force.
Not all the configurations can be simultaneously enabled and/or changed.
Other values different than those of default can ensure the proper operation of the unit, in case of doubt about
the value to be set contact please our office.
The company excludes any contractual and extra contractual liabilities for damages caused to persons, animals
or objects, by incorrect installation, setting and maintenance, improper use of the equipment, and the partial
or superficial reading of the information contained in this guide.
The access to the electric panel is limited for authorized personnel only.
It’s forbidder to carry out any work on the equipment under voltage.
To touch the equipment if you are not allowed.
If the lightning risk is high, the unit must be protected, the risk assessment must comply with the CEI EN 62305-2
regulation.
If there is a possibility that a lightning can strike the area around the appliance, shut down the unit and
disconnect the system upstream switch.
Make sure to ground the unit.
Do not ground the unit with pipes or lightning rods.
A poor grounding of the unit can result in electrocution.
Warning: Electrostatic discharges can damage the electronic components, before performing any work; ground
the electrostatic charge by touching objects such as water or heating pipes.
Requirements before performing electrical work on the control board:
Turn off the unit from the control panel ("OFF" displayed).
Put the switch “QF” general differential on OFF position
Wait for 15 seconds before getting access to the electric board
Check the ground connection before beginning any operation.
Be sure that you are well insulated from the ground, with dry hands and feet, or by using insulating platforms
and gloves.
Check that there is no foreign material near the system.
4PURPOSES AND CONTENTS OF THE MANUAL
This manual collects the basic information concerning the configuration of the onboard control panel of the unit.
It is addressed to the installer/user of the unit: it allows you to operate the machine efficiently, even without any previous specific
knowledge of it.
Not all the described functions can be individually and/or simultaneously selected. Please contact the technical office for any
information.
This manual describes the characteristics of the equipment when it was being put in marketing; therefore, it may not capture later
technological improvements introduced by the company as part of its constant endeavors in order to enhance the performance,
ergonomics, safety and functionality.
The company introduces also technological improvements and is not constrained to update the manuals for previous versions of
appliances that could not be compatible. So make sure to use the provided manual for the installed unit.
It’s recommended that, the user must follow the instructions contained in this booklet, especially those concerning the safety and
routine maintenance.

HWA1-A Air/water chillers with axial fans
5
5USER –ONBOARD CONTROLLER INTERFACE
In normal visualization, the 7 segment display with 4 digits shows the regulating temperature reported in tenths of degrees or the
warning code if at least one alarm is active. The type of visualization in menu mode page is depending on the position where you
are. Labels and codes are used to help the user in order to identify the settings of the display.
It is used to select the operating mode, and to reset the manual resetting alarms.
Each time you press the Mode button, the operating mode changes as per the sequence below:
off →cool →off
During the parameters’ setting, this button can be used to revert BACK to the previous level.
It allows you to enter into the setting menu parameters and to adjust the summer set point value.
UP button: In the setting mode, this button allows you to move up to a higher menu or to increase the value of a
parameter when you are in the “edit” mode.
DOWN button: In the setting mode, this button allows you to shift to a lower menu or to decrease the value of a
parameter when you are in the “edit” mode.
5.1 LED
Compressor LED
•FLASHING if timings are in progress waiting for compressor’s start up.
•ON if at least one compressor is running.
DHW LED
•Flashing if sanitary mode is in operation.
•ON if the selected mode is COOL + SAN or HEAT + SAN and DHW hot water
production is not is active.
Defrosting LED
•Flashing during defrost period counting. ON if defrosting is active
Antifreeze electric heater LED
•This LED is ON if the antifreeze electric heater is in operation.
Water pump LED
•This LED Function not available
Alarm LED
•This LED is ON if an alarm is activated.
Heat LED
•This LED is ON if the unit is in HEAT or HEAT + SAN mode operation.
Cool LED
•This LED is ON if the unit is in COOL or COOL + SAN mode operation.

HWA1-AAir/water chillers with axial fans
6
5.2 Menu’s structure diagram
Level 0 (U) = It’s always visible
Level 1 (M) = it’s visible if you enter the maintainer or manufacturer password
Level 2 (C) = it’s visible if you enter the manufacturer password
Level 3 (A) = it’s visible only via Modbus
5.3 Menu
The main functions of the menus are listed below, especially when there are some unambiguous functions. The main menu
manages the following items
MENU
LABEL
LIVEL OF PASSWORD
OTHER CONDITIONS
Setpoint
Set
User
Not accessible if the Hi-T control panel is connected
Sonde
tP
Installer
---
Alarms
Err
User
Only in case of active alarms
Digital inputs
Id
Installer
---
Parameters
Par
Installer
---
Password
PSS
User
---
Number of operating hours
oHr
Installer
---
USB
USb
Installer
Only in the USB flash drive is present with its files
You need to access to the password menu for introducing the relative password and enable an access with a greater privilege.
Once you exit completely from the menus, you lose the password privilege and need to re-enter it.
5.3.1 Setpoint menu
You can display and change the various setpoints.
SETPOINT
DESCRIPTION
UNIT
DEFAULT
RANGE
Coo
First setpoint in the summer
°C
7.0
H03 ÷ Co2
Hea
First setpoint in the winter
°C
45.0
He2 ÷ H01
*San
DHW setpoint
°C
48.0
H02 ÷ H01
Co2
Second setpoint in the summer
°C
18.0
Coo ÷ H03
He2
Second setpoint in the winter
°C
35.0
H02 ÷ Hea
5.3.2 Password menu
Enter the password for the desired access level. The controller will automatically activate the desired access level and then they
will appear on this level the functions which can be enabled from this level.
5.3.3 Sensors menu
The value of the various probes is displayed. The number of visible sensor depends on the presence of the I/O expansion modules.
Particular cases:
•Err = Sensor is faulty
•--- = Sensor not used (no function associated to such sensor)
By entering the maintainer password in the menu of analog inputs "tP", at the level 1 of the menu structure diagram of the on-
board control panel, you can read the values of the current probes:

HWA1-A Air/water chillers with axial fans
7
tp
DESCRIPTION
Unit
t01
Water inlet temperature
°C
t02
Water outlet temperature
°C
t03
Compressor intake temperature
°C
t04
Compressor discharge temperature
°C
t05
Outdoor air temperature
°C
t09
Low pressure
bar
t10
High pressure
bar
*t15
Desuperheater gas temperature sensor (if present)
°C
*t16
Recovery temperature (if present)
°C
*t17
Domestic hot water temperature (if present)
°C
*t18
Plant water plant temperature remote sensor (if present)
°C
(*) If the “Gi” optional module is installed.
5.3.4 Alarms menu
This menu appears only in case of active alarms. You can check all active alarms. The alarms are divided by circuit in case of multi-
circuit units (the ALCx label allows to get access to the alarms of the circuit number x).
5.3.5 Digital inputs menu
You can check the status of the digital inputs.
0 = inactive input
1 = active input
5.3.6 Parameters menu
The parameters are collected in groups, each group is identified by a three-digit code, while the index of each parameter is
preceded by a letter.
DESCRIPTION
GROUP’S IDENTIFICATIVE CODE
PARAMETER’S INDEX
VISIBILITY
Configuration
CnF
H-
USER/INSTALLER
Compressor
CP
C-
INSTALLER
Fan motor
FAn
F-
INSTALLER
Alarms
ALL
A-
INSTALLER
Regulation
Re
b-
INSTALLER
Pump
PUP
P-
INSTALLER
Electric heaters
Fro
r-
INSTALLER
Defrosting
dFr
d-
INSTALLER
Electronic valve
EEu
U-
INSTALLER
Offset
OFF
o-
INSTALLER
Inverter compressors
nCP
n-
INSTALLER
5.3.7 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 get access to the menu only
with password.
5.3.8 USB menu
Below are indicated the functions that are available through the use USB flash drive that is connected to the board.
•CONTROLLER FIRMWARE UPDATING
You can upgrade the firmware using the USB flash dive via its port on the controller.
For the update:
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. Feed the unit by placing the main switch on the ON state;
5. Enter at the parameters PRG→PSS→PRG →(introduce the maintainer password)→PRG→USB→UPdF→PRG.
The automatic firmware update process starts with the selection of this option, the display shows the transferred data in
Kilobytes. When the update is completed the display shows "boot" then the LEDs will light up in sequence.
6. .Once the update is completed, the card returns to normal operation and the appliance is ready to be enter in operation.
7. Turn off the unit by placing the main switch in OFF position.
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

HWA1-AAir/water chillers with axial fans
8
8. Remove the USB pen-drive from its port.
9. Feed the unit by placing the main switch on the ON state.
Perform the procedure for all controllers in the unit.
•PARAMETERS UPDATING
You can upgrade the parameters using the USB pen-dive via its port on the controller.
For the update:
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. Feed the unit by placing the main switch in the ON state;
5. Enter at 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. Feed the unit by placing the main switch on the ON state;
5.4 User adjustable set-points
SET-POINT
DESCRIPTION
UNIT
DEFAULT
RANGE
Coo
First setpoint in the summer
°C
7.0
H03 ÷ Co2
Hea
First setpoint in the winter
°C
45.0
He2 ÷ H01
*San
DHW setpoint
°C
48.0
H02 ÷ H01
Co2
Second setpoint in the summer
°C
18.0
Coo ÷ H03
He2
Second setpoint in the winter
°C
35.0
H02 ÷ Hea
6MANAGEMENT OF COMPRESSORS
The compressors are managed by the controller which calculates the compressor on and off events according to the setpoint
based on heat within a differential.
If several compressors are configured, the controller selects the start-up and shutdown of compressors according to operating
hours. More precisely:
The ON/OFF compressor which is selected to operate will be the one (among all available compressors) with the lowest
number of operating hours).
The ON/OFF compressor which is selected to shutdown will be the one (among all running compressors) with the maximum
number of operating hours).
6.1 Cooling mode
•Pa b05 = Compressor regulation delta cut-off
•ST = regulation temperature sensore
•Set cool (G01) = regulation of cooling setpoint.
•b01 = regulator proportional band (cool)
•b05 = compressor regulation delta cut-off
•b25 = compressor regulation delta cut-on
•b07 = integral time
•HzMin = Minimum frequency of operation derived from the algorithms of limitation
•HzMaxReg = Maximum working frequency of the compressor in cooling mode
The various characteristics are represented in the below table:
Step 1
Step 2
Number of compressors
Off
On
Off
On
1
Set –b05
Set + b25
2
Set –b05
Set + b25
Set + b25
Set + b25 + b01
3
Set –b05
Set + b25
Set + b25
Set + b25 + (b01/2)
6.2 Heating mode
•Set = Setpoint in heating mode (Heat);
•Pa b02 = Regulation band of compressors in heat pump
•Pa b05 = Compressor regulation delta cut-off
•H09 = Configuration of the heat pump presence parameter (0 = Heat pump not present; 1 = heat pump is present)
•ST = regulation temperature sensor
•Set heat G02= Setpoint in heating mode
•b02 = compressors regulation band in heat pump operation
•b05 = compressor regulation delta cut-off
•b25 = compressor regulation delta cut-on

HWA1-A Air/water chillers with axial fans
9
•b07 = integral time
•HzMin = Minimum frequency of operation derived from the algorithms of limitation
•HzMaxReg = Maximum working frequency of the compressor in cooling mode
The various characteristics are represented in the below table:
Step 1
Step 2
Step 2
Number of compressors
Off
On
Off
On
Off
On
1
Set + b05
Set –b25
2
Set + b05
Set –b25
Set –b25
Set –b25 - b01
3
Set + b05
Set –b25
Set - b25
Set - b25 - (b01/2)
Set - b25 - (b01/2)
Set - b25 - b01
6.3 Domestic hot water mode
In sanitary mode, the maximum power is employed (like when the thermoregulator is always requiring 100% of capacity).
However, the various limitations of the maximum frequency associated to the envelope and the limitation for maximum electrical
absorption are active.
6.4 Safe time periods
The compressors will respect the minimum waiting time for the on or off events (regardless of the configuration and if are
inverters or ON/OFF type)
C01 = Minimum Off time of a compressor.
C02 = Minimum time between two start-up of the same compressor.
C03 = Minimum delay time between a compressor switch-on and switch-on of the next one.
C04 = Minimum delay time between a compressor shutdown and shutdown of the next one.
6.5 Deactivation of compressors for outdoor temperature
If the outdoor temperature sensor is configured and is not in trouble, so the compressors cannot work because of low outdoor
temperature. The function is enabled if:
•Outdoor temperature sensor integrated and operating.
•Parameter Pa r07 = 1.
7DYNAMIC SET-POINT CONTROL
The controller allows change the set-point by adding a value depending on the temperature of the outdoor air sensor. This
function can be used if necessary by modify the parameter values, following the below information (it is the installer’s
responsibility to change the parameters).
b08 active = 1/not active = 0 dynamic set-point (in the case of using of the optional “Hi-T” remote control panel for climatic
compensation, b08 must be deactivated).
b09 = Maximum offset in cooling.
b11 = Set outdoor temperature in cooling.
b13 = ΔT in cooling.
Set-point modification as a function of the outdoor temperature:
7.1 Set-point adjustment from 0-10v input
If the analog input 0-10Volt/raziometric is configured (H12-H30 = 40), then the value read from the sensor in matter is used to
adjust the setpoint as follows:
•The entity of calibration is given by B15.
•Se B20 = 0 Enablement of 0 –10 Volt input type
•Se B20 = 1 Enablement of ratiometric input type
Cooling

HWA1-AAir/water chillers with axial fans
10
7.2 Calculation of the correction with 0-10V input
-if the input is at 5 volts, the set point will be the value parameter setting.
-if the input is at 0 volts, the actual set point will be: set point - b15/2.
-if the input is 10 volts, the actual set point: set point + b15/2.
The type of interpolation is linear
7.3 Calculation of the correction with ratiometric input
-if the input is at 50% the actual set point will be the value parameter setting (Coo/Hea) mode.
-if the input is at 0% the actual set point will be: set point (Coo/Hea) - b15/2.
-if the input is at 100% the actual set point will be: set point (Coo/Hea) + b15/2.
The type of interpolation is linear.
Another type of setting that allows to change the setpoint by adding (or subtracting) a value in function of the 0-10V analogue
input (if enabled). To enable the function, you must set the H21 parameter to be 40, and change the values of the parameter b15
(range 0-10), taking into account that:
-if the input is at 0 volts, the actual set point will be: set point (Coo) - b15/2.
-if the input is at 5 volts, the set point will be the value parameter setting (Coo) mode.
-if the input is 10 volts, the actual set point: set point (Coo) + b15/2.
The 0-10V signal must be applied to the terminals AI10+ and AI10- (see the wiring diagrams).
Note: In "cooling" mode, considering that the setpoint 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 setpoint set from 0-10V input to take values below the threshold
of the antifreeze operation which is 4°C.
7.3.1 Settings for standard climatic curves
HEATING COOLING
Set-point
b08
b10
b12
b14
A
20°C
1
18°C
20°C
-27°C
B
20°C
1
13°C
20°C
-25°C
C
20°C
1
25°C
20°C
-29°C
D
40°C
1
10°C
20°C
-28°C
E
40°C
1
15°C
20°C
-25°C

HWA1-A Air/water chillers with axial fans
11
Set-point
b08
b09
b11
b13
F
5°C
1
5°C
37°C
-17°C
G
10°C
1
8°C
40°C
-20°C
8CIRCOLATOR MANAGEMENT
The circulator of the pump can be set according to one of the following operation modes:
-Operation by thermo-regulator (default)
-Operation by thermo-regulator with periodic activation
-Continuous operation
The circulator will switch off immediately if:
-You have a pump (circulator) in locking alarm including the manual reset flow switch alarm.
-The unit is in stand-by mode or when it’s switched off from a remote input (when it’s turned ON). The circulator turns off
always with a delay given by P02.
The circulator is always running if the antifreeze heaters are ON.
The circulator can be configured with the parameter P03 in order to make it operating independently than the compressor or
under a call for operation.
P03 = 0 for Continuous operation
P03 = 1for operation under the thermoregulatory call
Note: Whenever the flow switch alarm is automatically reset the pump is ON even if the compressor is off.
Otherwise, the circulator remains always in operation if the antifreeze heaters are ON or when the hydraulic pump operates in
antifreeze mode. The operation in antifreeze mode starts if the water setting temperature decreases below P04 °C (default value
5°C), and stops if the water setting temperature increases above P04+P05 °C (the default value of P05 is 2,0°C).
The regulation of the circulator is linear type.
8.1 Air purging of the system
This function allows the air purging of the system, to achieve this function, the circulator will run at its maximum speed.
To enable the function:
Controller in OFF mode
Enter at the parameters PRG→PSS→PRG→(introduce the maintainer password)
Press simultaneously for 3seconds the buttons UP and DOWN.
The circulator of the plant will run at the maximum speed for 5 minutes then it stops the operation.
It is possible to stop manually the air purge cycle function of the system by pressing the MODE/ESC button, or by pressing
simultaneously the UP and DOWN buttons for 3 seconds.
During this function, the flow-switch alarm is deactivated.
8.2 Operation by mean of the thermoregulator (Default)
During this operating mode (P03=1, default), the thermo-regulator actuates the circulator; after a time delay of P01 seconds from
the circulator pump startup, the compressor also will turn ON. However, during the power off status, the circulator pump turns off
with a delay of P02 minutes after shutdown status by mean of the thermo-regulator (the shutdown status is corresponding to the
off status of the compressor).
If the flow switch alarm is active in automatic reset, the pump is anyway ON even if the compressor is off.
If you enable the operation of the unit from "DI2" digital input corresponding to the remote "on-off" the circulator will start
operation immediately for 2 minutes regardless of the internal thermoregulation of the unit (the activation of water recirculation
in the plant circuit leads to the correct activation of the thermoregulation).

HWA1-AAir/water chillers with axial fans
12
8.3 Operation under thermoregulator call with periodic activation
The function is disabled if P17= 0 (default). If the pump is set to operate by thermo-regulator actuation (P03 = 1, default), it will be
activated periodically for a duration given by the parameter P17 (in seconds) after a counting time set by the parameter P16 (in
minutes), activated when the thermoregulation is fulfilled and the pump turned off.
In case of activation of the flow switch alarms with automatic reset the pump is still ON even if the compressor is off.
The periodic function is interrupted also in case of intervention of the antifreeze thermo-regulator which leads to the forced
operation of the pump.
8.4 Hydraulic pump in anti-freezing operation
If the setting temperature is too low and the pump is off, the pump will be activated automatically.
Pa P04 set antifreeze pump activation
Pa P05 hysteresis pump in antifreeze
8.5 Continuous operation
In this mode of operation (active if P03 = 0), the pump is always ON. It turns off only when the unit stops to operate.
8.6 Linear regulation of the circulator –double ΔTWater –
The analog output varies according to difference in temperature between water inlet and water outlet of the heat exchanger.
•P06 set ΔTWater inlet/outlet of modulating pump in heating mode
•P07 maximum speed of the modulating pump
•P08 minimum speed of the modulating pump
•P09 set ΔTWater inlet/outlet of the modulating pump in cooling mode.
•P10 Modulating pump linear band
−In cooling mode: [T Water inlet] –[T Water outlet]
−In heating mode: [T Water outlet] –[T Water inlet]
ON
OFF
Sonda regolazione
Set antifreeze o pompa P04
P05

HWA1-A Air/water chillers with axial fans
13
Example in cooling:
If the difference in temperature between water inlet and outlet is greater than P09 + P10, the pump will run at maximum speed.
If the difference temperature between water inlet and outlet is less than P09 - 0.2°C, the pump will run the minimum speed.
In the other cases, the pump modulates trying to match the temperature difference with P09. For the heating mode, the same
considerations are valid with replace only P06 with P09. Please see paragraph 18.6 for changing the parameters.
Warning: During the DHW production mode, the pump is constrained to operate at its maximum speed.
In domestic hot water production mode, the pump will operate at the maximum speed.
8.7 Management of double circulator
You can configure the system to work with 2 pumps.
Parameter P13 shown the utilization logic:
•P13 = 0: the pump will work for few hours.
No change of pump during operation, i.e. this setting can be selected only if it is needed to operate one pump.
•P13 = 1: Periority of selection on pump 1.
•P13 = 2: Periority of selection on pump 2.
Note:
Each pump has its own thermal protection digital input;
If one of the pumps is not available because of alarm, the other pump will be selected regardless of the P13 value.
9FAN MOTOR CONTROL
The operation of the fan motors is depending on the value read by the pressure sensors.
There is a resettable thermal device with immediate rearmament and will act only on fan motor.
9.1 AC fan motor
The condensation control is a function of the condensing pressure in chiller mode and the evaporation pressure in heat pump
mode.
The fan speed can be independently controlled from the compressors or under the CALL of the same compressors.
Pa F05 for fan output mode
0: if all the compressors of the circuit are switched off and the fan is switched off.
1: The condensation control is independent from the compressor.
Switching off the fan motor is bypassed for a period of time equal to Pa F12 from a circuit’s compressor start-up. During this
period if the regulator requires the cut-off the fan goes to the minimum speed.
9.2 Star-Delta (Y-∆) fan motor
For cooling only “HWA1-A”versions, the fan motor is enabled to operate when at least one compressor is running; the fan speed
adjustment is depending on the condensation pressure.
If the condensation pressure exceeds F08 (default 25bar), the fan motor starts and the three-phase windings are starred
internally.
When the condensation pressure is greater than the parameter F14 (default 35bar), the fan motor windings connections
switch to triangle type and then the maximum fan speed is started.
If the condensation pressure is less than F14 - 5 bar, the fan motor windings switch to star.
If the condensation pressure is less than F08 - 5bar, the fan motor will stop operation.
9.3 EC fan motor control
The fan speed control in cooling mode occurs according to the diagram shown below, where:
F06 = Minimum fan speed in cooling mode;
F07 = Maximum silent fan speed in cooling mode
F08 = Set temperature/pressure to the minimum fan speed in cooling mode
F09= Fan motor linear band in cooling mode
F10 = Delta cut-off of the fan

HWA1-AAir/water chillers with axial fans
14
F11 = Cut-off hysteresis and silent/maximum fan speed
F13 = Maximum fan speed in cooling mode
F14 = Set temperature/pressure to the maximum fan speed in cooling mode
F6-F10 = Set forced fan stop for low condensing pressure
The fan operation control in heat pump mode occurs following the diagram shown below, where:
F10 = F10 = Delta cut-off of the fan motor in cooling/heating
F11 = Cut-off hysteresis in cooling/heating
F15 = Minimum fen speed in heating mode
F16 = Maximum silent fan speed in heating
F17 = Set pressure for minimum fan speed in heating mode
F18 = Fan speed linear band in heating mode
F19 = Maximum fan speed in heating mode
F20 = Set pressure for the maximum fan speed in heating mode
F17+F10 = Set forced fan stop for high evaporating pressure
The fan speed can be controlled via analog/digital outputs or, alternatively, via serial on the same serial of the modulating
compressor. Please see paragraph 17.5 for changing the parameters.
10 Defrosting cycle management
The defrost cycle function is available only in heat pump mode and is used to prevent the frost formation on the surface of the
air/air coil. The frost formation on the evaporator, which occurs more frequently at very low ambient temperatures, in addition to
greatly decreasing the thermal efficiency of the unit, it can lead to the risk of damaging the unit itself. The adjustable parameter
d01 enables the defrost operation (=1 enabled defrosting).
10.1 Forced manual defrost
If the appliance is ON and in heating mode, you can force manually the defrosting mode by pressing the UP, DOWN, and ENTER
buttons for 3 seconds.
The same thing can be done via serial, sending the modbus 200 register value '-1'. This writing will not change the state of the
appliance, but only leads to forced manual defrost.
11 ANTIFREEZE PROTECTION ELECTRIC HEATERS (IF THE KA ACCESSORY IS PRESENT)
The antifreeze electric heaters (installed on the outer surfaces of the evaporator plates) and the heating cable placed on the
basement of the appliance turns on when the outdoor air temperature decreases below 3°C and the unit goes in defrosting
operation (or if r19=0 even if the unit is not in defrosting cycle, or in stand-by mode). The previous heaters will be stop operation if
the outdoor temperature exceeds 5°C or the last defrosting is terminated after more than r19 minutes (default 10 minutes) (with
r19≠0).

HWA1-A Air/water chillers with axial fans
15
In case you want to produce gelid water, it is necessary to modify the actions of antifreeze resistances, as well as the set of
activation of the antifreeze alarm (A08 = 4°C by default) and its hysteresis (A09 = 3.0°C by default).
12 REMOTE ON/OFF CONTROL
The ON/OFF function is already enabled by default. Remove the bridge of the terminal block then the unit will be placed in stand-
by mode (in such status the display of the on-board unit controller will show the "E000" code). When the contact is closed, the
machine exits from standby mode and the circulation pump will run for 2 minutes.
To modify this function, enter at the parameters PRG→PSS→PRG→(introduce the maintainer password)→PRG→PAr→PRG→CnF.
See paragraph 17.2.
Parameter
Unit
Value
Description
Terminals
Notes
H47
Num
2
(default)
Remote On/Off digital input
ID3-ID3
Voltage free digital input
13 SIGNALIZATIONS FOR HWA1-A MODELS
In cooling-only versions, on the DO7 - DO7N terminals (Parameter H85), you can set a 230Vac signal output voltage by setting the
following user parameters by entering the installer password in the control panel that is situated on the front panel.
Values
Description
21
Signalization of defrosting period
•The digital output is activated at the beginning of defrosting cycle, once the Pa d06 time period has terminated
•The digital output is deactivated at the end of defrosting cycle, once the Pa d07 time period is terminated.
24
Signalization heat pump alarm
31
Signalization plant season.
•The output is active in COOLING operation
•The output is not active in heating operation
•The output is not active when the unit s OFF.
During the DHW production and defrosting cycle, the output keeps the settings of the provenance season.
47
The output is activated if one the below alarms is active with the following conditions must be fulfilled:
Alarm
Recovery condition
E001
Manual
E002
Manual
E005
Manual
E006
Manual
E008
Manual
E018
Automatic
E041
Manual
E101
Automatic
E102
Automatic
Sensor error
Automatic
13.1 Machine lockout signalization
You can configure a digital output for the machine lockout warning. One of the DO must be configured with the value 47 in order
to enable this type of output.
The output switches will be activated if one of the following alarms is active with the following conditions:
14 OTHER CONTROL FUNCTIONS WITH THE PLANT MANAGEMENT GI-MODULE (optional)
The presence of GI optional plant management kit allows you to get a third controller located inside the electrical board acting as
an I/O ports expansion module. By mean of this last controller, it is therefore possible to increase the number of logic functions
that can be managed by the main controller; in particular, these logic functions concerns the plant management, as described
below. The following functions can be activated by the on-board controller which is located on the front panel of the unit.
14.1 Free-cooling
The free-cooling function allows the pre-cooling of the plant return water using air heat exchanger if allowed by the climatic
conditions. The function is active in cooling mode.
Herein below is reported the chart showing the free-cooling activation demand based on the outdoor and intake temperatures:

HWA1-AAir/water chillers with axial fans
16
The free-cooling demand will be activated when the outdoor temperature is lower with F26 than the intake temperature.
After activation of the free-cooling, it will stop when the outdoor temperature increases above Tintake - F26 + F27.
The free-cooling control valve is active when free-cooling demand is active.
14.1.1 Ventilation in freecooling
When the free-cooling control valve is active:
When compressors are active, or if compressors are called, the ventilation starts as described in the condensation control
controller.
If the compressors switch off for satisfied thermoregulation, the ventilation logic switches the control to free-cooling demand with
the following modes:
-The ventilation is forced at maximum speed (100%) for the first F25 minutes.
-When the time defined by F25 is terminated, the regulation becomes PI type with band given by b01, the setpoint is that
of the current plant water regulation.
-In case of turning back to the zone of compressors thermoregulation call, the ventilation returns under the condensation
control.
14.2 Enablement of domestic hot water production (DHW)
In sanitary mode, the maximum power is employed (like when the thermoregulator is asking always for 100%). However, the
various limitations of the maximum frequency associated with the envelope and the limitation for maximum electrical absorption
are active.
To activate this function, it is necessary to connect to the ST2E –ST2E terminals (enabled as analog input) a temperature sensor
which should be placed inside the water tank. Once connecting and placing the sensor, then it is necessary to enable the domestic
hot water function.
To enable this function, enter at the parameters PRG→PSS→PRG→(introduce the maintainer password)→PRG→PAr→
PRG→CnF.
I/O port –Parameter
Value
Function
H10
0 (default)
Deactivated function
1
Active function in heating and cooling mode.
The remote on-off function doesn’t deactivate the domestic hot water production (DHW).
2
Active function in heating and cooling mode.
The remote on-off function deactivates the domestic hot water production (DHW)
3
Active function in heating mode.
The remote on-off function doesn’t deactivate the domestic hot water production (DHW).
4
Active function in heating mode.
The remote on-off function deactivates the domestic hot water production (DHW)
5
Active function in cooling mode.
The remote on-off function doesn’t deactivate the domestic hot water production (DHW).
6
Active function in cooling mode.
The remote on-off function deactivates the domestic hot water production (DHW).
H29
6
Activation of domestic hot water temperature sensor DHW (ST7E terminals)
H90
6
DHW valve command (D05E/D05EN terminals)
If the DHW temperature is below the set point value (PRG->Set->SAN), the unit activates the sanitary valve and the compressor
will be placed at the maximum frequency starting the modulation at 1°C before (setpoint-1°C) the set value and it stops at 1°C
after the set value (setpoint+1°C). Once achieved the set point value, the valve switches to the stand-by mode and the
compressor works normally.
While shifting from user’s to domestic hot water, the operating sensor changes from “outlet water temp. sensor” to “sanitary
tank temp. sensor”. While shifting from the winter operating mode to the sanitary operating mode, the compressor does not stop
operation, and will be placed at the maximum established frequency which can be controlled; however, when shifting from the
summer operating mode to the sanitary operating mode, the compressor will stop operation for waiting for the safe period.
The defrost cycle during winter operation mode is always performed on the user side, never on the sanitary water tank.
ON
OFF
Temperatura esterna
Freecooling demand
Temperatura di ripresa
F27
F26

HWA1-A Air/water chillers with axial fans
17
NOTE:
−If H10 = 15, the remote shutdown of the unit (remote on-off) or from the on-board unit controller, or from the remote
control panel has no effect on sanitary operating mode. The unit will be placed in sanitary mode as setting priority after its
power on. The on-board unit display shows the temperature measured by the sensor placed inside the sanitary water tank.
Once the sanitary cycle is completed, the display returns to show the temperature of the outlet water sensor.
−If the remote ON-OFF digital input (onoff-onoff terminals) is open, with enablement of the function of domestic hot water
(H10=1 and H20=6), the display on-board unit shows the code "SAN". Once the sanitary cycle is concluded, the display
returns to show the code "E00" indicating that the remote ON-OFF contact is open.
−If H10 = 2, the remote on-off function disenables the production of domestic hot water and also the operation of the heat
pump in heating and cooling on plant side.
14.2.1MEMORIZATION OF THE SENSOR IN HEATING MODE
In the case of commutation from water users to the domestic hot 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 sensor
will be memorised before changing to DHW mode.
When the DHW thermoregulation is reached, the reference temperature on the plant side will take the value which is previously
memorised.
The memory function will be interrupted:
-When the temperature detected by the sensor becomes lower than the memorized value;
-Or after a period equal to b06 seconds (default 45 seconds).
14.2.2 SANITARY MODE CALL FROM DIGITAL INPUT
In the case where a digital input is configured for sanitary water mode call (instead of the sensor), the heat pump will be placed in
sanitary mode when the digital input is closed (the same behaviour is obtained when DHW temperature sensor < (set of DHW –Pa
b03) and exits from the DHW production when the digital input is open.
Note: If a temperature sensor is installed and configured, this management will be ignored and the thermoregulation will be done
on the basis of the detected temperature by the sensor.
To enable this function, enter at the parameters PRG→PSS→PRG→(introduce the maintainer password)→PRG→Par→PRG→CnF.
I/O port –Parameter
Value
Description
Function
H62
28
Digital input for sanitary mode call from
digital input
Close contact →Heat pump in sanitary mode.
Open contact →Heat pump in plant system
mode.
(*) Otherwise, it is possible to use another digital input.
In the case where a digital input is configured for sanitary water function call (instead of the sensor), the heat pump will be placed
in sanitary mode when the digital input is closed and exits from the DHW production when the digital input is open.
The DHW setpoint of the heat pump is not considered here, its management is the designer’s responsibility, who must take into
consideration the DHW protection and the configuration of the whole system.
Note: It is possible to invert the polarity of the digital input, for such purposes please contact our technical office.
14.2.3 REGOLATOR IN COOLING
If the DHW temperature is below the sanitary water set - Pa b03, the sanitary valve is activated and the compressor is switched
off. When the safe time period is terminated, the compressor change setting to the nominal frequency for domestic hot water
(see nominal frequency calculation) until achieving set of domestic hot water. At this point, the sanitary valve will stop and then
the compressor will stop. Once the safe time period is terminated, the chiller resumes the normal regulation.
14.2.4 REGULATOR IN HEATING
If the sanitary water temperature is below the sanitary water set - Pa b03, the DHW valve will be activated without switching off
the compressor which will change frequency to the rated one (see calculation of the nominal frequency of the compressors in
sanitary mode) until the temperature achieves the set of 'sanitary water. At this point, the sanitary valve switched off and the unit
will resume normal operation.
14.2.5 SANITARY VALVE REGULATOR
ON
OFF
DHW temp. sensor
DHW setpoint
Pa b03

HWA1-AAir/water chillers with axial fans
18
14.2.6 HEATING MODE ON DOMESTIC HOT WATER TANK
If the parameter Pa H130 is set to be 1, the unit uses the domestic hot water tank also for heating the plant side. Under these
conditions, therefore, the relay that controls the domestic hot water will be excited even during heating mode operation and not
only in sanitary mode.
During the defrosting cycle and cooling mode, the valve will stop operation.
14.3 SUMMER/WINTER MODE ROMOTE COMMUTATION
Remote possibility of controlling the heating/cooling mode of the heat pump.
To enable this function, enter at the parameters PRG→PSS→PRG→(introduce the maintainer password)→PRG→PAr→PRG→CnF
See paragraph Errore. L'origine riferimento non è stata trovata..
Parameter
Unit
Value
Description
Terminals
Notes
H57
Num
3
Digital input for operazioni mode management.
Open contact →heat pump in ”cool” mode,
Close contact →unit operates in “heat”mode.
ID3E- ID3E
Voltage free digital input
14.4 PLANT REMOTE CONTROL (MANAGEMENT)
It is possible to enable a plant temperature sensor in order to allow the on-board unit controller to correctly manage the
regulation.
To enable this function, enter at the parameters PRG→PSS→PRG→(introduce the maintainer password)→PRG→PAr→PRG→CnF
Parameter
Value
Description
Terminals
H30
41
Enablement of the plant remote temperature sensor
ST8E- ST8E
The plant circuit remote sensor adjusts the heat pump temperature only during the startup period of the compressor(s), the
shutdown is managed by the outlet temperature sensor of the heat pump. For more explanation herein below is reported an
illustrating table regarding the operation of the system:
Mode of operation
Active call of the heat pump
Heating
Temperature detected by the outlet sensor of the heat pump < setpoint Hea - b05
and
Temperature detected by the plant circuit remote sensor < water setpoint Hea - (b22 - b05)
Cooling
Temperature detected by the outlet sensor of the heat pump > setpoint Coo + b05
and
Temperature detected by the plant circuit remote sensor > setpoint Coo + (b22 - b05)
NOTE: b05=1°C; b22=5°C.
14.5 DOUBLE SET-POINT MANAGEMENT
The double set-point function introduces a second working set-point of the plant side (in both cooling and heating mode).
It is possible to configure in the user terminal block a digital input allowing the transition from the first to the second set-point and
vice versa.
14.5.1SETTINGS
The parameter “H129”of double setpoint mode setting (from maintainer menu):
H82
OPERATION
1
Classic mode
2
Double setpoint active in the summer
3
Double setpoint active in the winter
4
Double setpoint active in the summer and winter
To activate the function enter with maintainer password to the parameters:
Parameter
Unit
Default
Value
Description
Terminals
Notes
H57
Num
0
26
Digital input for second setpoint
ID3E –ID3E
-
H90
Num
0
25
Under-voltage output for 3 way valve
for radiant panels
DO5E(phase)
DO5EN(neutral)
Under voltage output single
phase 230Vac, 50Hz, 5A resistive,
1A inductive to connect relay coil
for obtaining a free contact.
The under-voltage output with live contact for switching from first to second set-point and vice versa. This can be used, for
example, for switching a hydronic valve for to divert the water flow between the radiant system and the ventilation system. If it is
needed a relay should be used for the hydronic valve power supply.

HWA1-A Air/water chillers with axial fans
19
14.5.2ADJUSTABLE SETPOINTS
Setpoint type
Setpoint (summer/winter)
Summer
Winter
First setpoint (°C)
Coo/Hea
7 (5÷18)
45 (35÷57)
Second setpoint (°C)
Co2/He2
18 (7÷23)
35 (25÷45)
For setting the setpoint from the conboard control panel, you can use the SET button.
The second setpoint is greater than the first setpoint in the summer and lower in the winter:
•in the summer: T2 >= T
•in the winter: T2 <= T
14.5.3COMMUTATIONS
The commutation sequence from first (normal) set-point to the second setpoint:
•in the summer: Commutation of the 3-way valve only when the second set-point -5°C is achieved.
•in the winter: commutation of the 3-way valve only when the second set-point +5°C is achieved (at any case after 5min
from setpoints modification, the commutation of the valve will be carried out)
The commutation sequence from second set-point to the first setpoint:
•Commutation of the 3-way valve
•Modification of the operating setpoint after a lap of time equal to the required time for opening of the 3-way valve.(default
b04=30s from maintainer menu)
14.6 MANAGEMENT OF A SECONDARY CIRCULATOR (RELAUNCHING PUMP)
As an alternative to the double set-point function, it is possible management of a secondary or relaunching circulating pump to
serve the plant system.
An ambient thermostat must be appropriately configured (NC state) connected on the terminals DI3E-DI3E.
−Thermostat contact normally open →the secondary circulator will be activated;
−− Thermostat contact normally closed →the secondary circulator is off with a delay given by P02 (post-pumping)
To enable this function, enter at the parameters menu PRG→PSS→PRG→(introduce the maintainer password)→PRG→PAr→
PRG→CnF
Parameter
Unit
Value
Description
Terminals
Note
H57
Num
19
Digital input for thermostat call
ID3E
ID3E
-
H90
Num
43
Under voltage output for secondary circulator
DO5E(phase)
DO5NE(neutral)
Under voltage output single phase
230Vac, 50Hz, 5A resistive, 1A
inductive to connect relay coil for
obtaining a free contact.
The thermoregulation of the pump is depending on the thermostat call.
With Heat Pump in Off, the secondary circulator will stop operation independently than the thermostat call.
14.6.1 ANTIFREEZE CONTROL OF PLANT SECONDARY PUMP
If the remote plant sensor is configured, there is an antifreeze control on the secondary circulator.
If the regulation temperature is too low and the pump is off, it will start automatically to operate in case of:
Pa P04:Setting parameter of pump operation in antifreeze cycle
Pa P05:Pump hysteresis in antifreeze cycle
15 SIGNALIZATIONS’MANAGEMENT
On the DO5E/DO5NE (Parameter H90), you can set a 230Vac signal output by setting the following user parameters by entering
the installer password in the controller situated on the front panel.
ON
OFF
Sensor of regulation
P04 Pump antifreeze setting
P05