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
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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

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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

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

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

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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.

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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:

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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
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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
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•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