Mitsubishi Electric i-BX-N User manual

TM_i-BX(-N)_NC05_00_06_20_EN
MEHITS S.p.A. ● TECHNICAL MANUAL
Version NC05 - Translation of the Original Instructions
1
The information in this document may be modified without prior notice.
The reproduction and/or dissemination of this document, even in part, is prohibited
without the written consent of MEHITS SpA.
TECHNICAL MANUAL
Translation of the original instructions
i-BX(-N)
Version NC05
EN

TM_i-BX(-N)_NC05_00_06_20_EN
MEHITS S.p.A. ● TECHNICAL MANUAL
Version NC05 - Translation of the Original Instructions
2
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TM_i-BX(-N)_NC05_00_06_20_EN
MEHITS S.p.A. ● TECHNICAL MANUAL
Version NC05 - Translation of the Original Instructions
3
Before carrying out any operation on the machine,
you must carefully read this manual
and make sure you understand
all the instructions and information given
Keep this manual in a known and easily accessible place
to refer to as necessary
during the entire life-span of the unit.
This manual was prepared by MEHITS S.p.A.: reproduction, even in part, is prohibited.
The original copy is kept on file by MEHITS S.p.A.
Any use of the manual other than for personal reference requires the prior authorisation of MEHITS S.p.A.
In the interest of improving the quality of its products, MEHITS S.p.A. reserves the right to modify, without notice, the
data and content of this Manual.

TM_i-BX(-N)_NC05_00_06_20_EN
MEHITS S.p.A. ● TECHNICAL MANUAL
Version NC05 - Translation of the Original Instructions
4
CONTENTS
1......... INTRODUCTION ................................................................................................................................................... 7
1.1.... OPERATING REQUIREMENTS .....................................................................................................................................................................7
1.2.... GENERAL FUNCTIONS .................................................................................................................................................................................7
2......... USER INTERFACE ............................................................................................................................................... 8
2.1.... USER TERMINAL ...........................................................................................................................................................................................8
2.1.1.....Buttons general functions........................................................................................................................................................................8
2.2.... GENERAL CHARACTERISTICS OF THE INTERFACE................................................................................................................................8
2.2.1.....Password management...........................................................................................................................................................................8
2.2.2.....Main menu masks ...................................................................................................................................................................................9
2.2.2.1 Main screen symbols .................................................................................................................................................................... 9
2.2.2.2 Main menu mask scrolling .......................................................................................................................................................... 10
2.3.... AMBIENT THERMOSTAT.............................................................................................................................................................................14
2.3.1.....Ambient thermostat addressing procedure ...........................................................................................................................................14
2.4.... PARAMETERS TABLE.................................................................................................................................................................................15
2.4.1.....Menu 00.................................................................................................................................................................................................15
2.4.2.....Menù 01.................................................................................................................................................................................................15
2.4.3.....Menù 02.................................................................................................................................................................................................18
2.4.4.....Menù 03.................................................................................................................................................................................................19
2.4.5.....Menù 04.................................................................................................................................................................................................19
2.4.6.....Menù 05.................................................................................................................................................................................................19
2.4.7.....Menù 06.................................................................................................................................................................................................20
2.4.8.....Menù 07.................................................................................................................................................................................................20
2.4.9.....Menù 08.................................................................................................................................................................................................20
2.4.10 ...Menù 09.................................................................................................................................................................................................21
2.4.11 ...Menù 10.................................................................................................................................................................................................21
2.4.12 ...Menù 12.................................................................................................................................................................................................22
2.4.13 ...Menù 13.................................................................................................................................................................................................22
2.4.14 ...Menu 14.................................................................................................................................................................................................27
3......... ALARMS ............................................................................................................................................................. 28
4......... FUNCTION DESCRIPTION................................................................................................................................. 31
4.1.... MACHINE MANAGEMENT –OPERATING MODES -.................................................................................................................................31
4.1.1.....Mode selection using the menu.............................................................................................................................................................31
4.1.2.....Mode selection from digital input...........................................................................................................................................................31
4.2.... SETPOINT REGULATORS...........................................................................................................................................................................32
4.2.1.....Hot offset ...............................................................................................................................................................................................32
4.2.2.....Cold offset .............................................................................................................................................................................................33
4.3.... ANTI-CONDENSATION FUNCTION ............................................................................................................................................................34
4.4.... COMPRESSOR REGULATION....................................................................................................................................................................35
4.4.1.....BLDC compressor start-up procedure...................................................................................................................................................35
4.4.2.....Inverter compressor oil recovery function .............................................................................................................................................35
4.4.3.....Compressor operating limit protection...................................................................................................................................................36
4.4.3.1 High compression ratio prevention (zone 2)............................................................................................................................... 37
4.4.3.2 High condensation pressure prevention (zone 3)....................................................................................................................... 37
4.4.3.3 High motor current prevention (zone 4)...................................................................................................................................... 37
4.4.3.4 High evaporation pressure prevention (zone 5) ......................................................................................................................... 37
4.4.3.5 Low compression ratio prevention (zone 6)................................................................................................................................ 37
4.4.3.6 Low differential pressure prevention (zone 7) ............................................................................................................................ 38
4.4.3.7 Low condensation pressure prevention (zone 8)........................................................................................................................ 38
4.4.3.8 Low evaporation pressure prevention (zone 9) .......................................................................................................................... 38
4.5.... POWER+ INVERTER CONFIGURATION.....................................................................................................................................................38
4.6.... MAIN MENU POWER+ INFORMATION.......................................................................................................................................................38
4.7.... MAXIMUM COMPRESSOR SPEED AS A FUNCTION OF THE EXTERNAL TEMPERATURE ................................................................39
4.8.... ELECTRONIC EXPANSION VALVE ............................................................................................................................................................40
4.8.1.....Valve pre-opening .................................................................................................................................................................................40
4.8.2.....Equalizations at start-up........................................................................................................................................................................40
4.8.3.....Pressure equalizations at compressor shutdown..................................................................................................................................40
4.9.... FAN................................................................................................................................................................................................................41
4.9.1.....Evaporation control................................................................................................................................................................................41
4.9.2.....Condensation control.............................................................................................................................................................................41
4.9.2.1 Regulation based on pressure.................................................................................................................................................... 41

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MEHITS S.p.A. ● TECHNICAL MANUAL
Version NC05 - Translation of the Original Instructions
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4.9.2.2 Regulation based on the external temperature up to version NC04.00 relC40 (not on three-phase i-BX-N units).................... 42
4.9.2.3 Regulation based on the external temperature starting from version NC04.00 relC50.............................................................. 42
4.9.3.....Activation of the pressure safety control ...............................................................................................................................................42
4.10 .. UNIT PUMP MANAGEMENT........................................................................................................................................................................43
4.10.1 ...General..................................................................................................................................................................................................43
4.10.2 ...Pump in continuous operation...............................................................................................................................................................43
4.10.3 ...Pump in sniffer mode.............................................................................................................................................................................43
4.11 .. ELECTRIC HEATER AT THE DELIVERY....................................................................................................................................................44
4.11.1 ...Replacement heater ..............................................................................................................................................................................44
4.11.2 ...Integration heater ..................................................................................................................................................................................44
4.11.3 ...Antifreeze heater ...................................................................................................................................................................................46
4.11.4 ...Defrost heater........................................................................................................................................................................................46
4.12 .. ALTERNATIVE HEAT SOURCE (BOILER) .................................................................................................................................................46
4.12.1 ...Replacement heat source......................................................................................................................................................................46
4.12.2 ...Integration heat source..........................................................................................................................................................................47
4.13 .. ANTIFREEZE PROTECTION........................................................................................................................................................................48
4.13.1 ...Exchanger antifreezee...........................................................................................................................................................................48
4.13.2 ...System primary circuit antifreeze ..........................................................................................................................................................49
4.13.3 ...System secondary circuit antifreeze......................................................................................................................................................49
4.13.4 ...Room temperature antifreeze (only with zones active) .........................................................................................................................50
4.13.5 ...DHW storage tank antifreeze ................................................................................................................................................................51
4.14 .. DEFROST......................................................................................................................................................................................................51
4.15 .. HEAT PUMP INHIBITIONS...........................................................................................................................................................................53
4.15.1 ...Operation outside envelope...................................................................................................................................................................53
4.15.2 ...External air temperature........................................................................................................................................................................53
4.15.3 ...External air temperature and water temperature...................................................................................................................................54
4.16 .. DEMAND LIMIT.............................................................................................................................................................................................55
4.17 .. TRAY HEATER .............................................................................................................................................................................................55
4.18 .. CURRENT OPERATION MODE NOTIFICATION ........................................................................................................................................55
4.19 .. NIGHT FUNCTION ........................................................................................................................................................................................56
5......... MANAGEMENT OF DOMESTIC HOT WATER (DHW)...................................................................................... 57
5.1.... MANAGEMENT OF THE DHW 3-WAY VALVE ...........................................................................................................................................57
5.2.... DHW STORAGE TANK MANAGEMENT .....................................................................................................................................................58
5.2.1.....Heat pump only .....................................................................................................................................................................................58
5.2.2.....DHW storage tank heater only ..............................................................................................................................................................59
5.2.3.....HP + DHW storage heater (P0202=3) or delivery heater (P0202=1 and P0300=1) .............................................................................60
5.3.... LOW ENERGY TARIFF.................................................................................................................................................................................62
5.4.... ANTI-LEGIONELLOSIS................................................................................................................................................................................62
6......... HARDWARE ....................................................................................................................................................... 63
7......... HARDWARE ARCHITECTURE.......................................................................................................................... 64
7.1.... ADDRESSING OF THE MODBUS MASTER COMMUNICATION MODULES............................................................................................64
7.2.... PSD1 OR PSD2 DRIVER ADDRESS CONFIGURATION............................................................................................................................64
8......... INPUT / OUTPUT CONFIGURATION TABLE.................................................................................................... 65
8.1.... AIR / WATER INVERTER UNIT WITH DHW MANAGEMENT (WITH 3-WAY VALVE) ..............................................................................65
8.2.... I-BX CHILLER ONLY NON-REVERSIBLE INVERTER AIR/WATER UNITS ..............................................................................................67
9......... ANNEXES ........................................................................................................................................................... 68
9.1.... PID REGULATION ........................................................................................................................................................................................68
9.1.1.....Proportional Action ................................................................................................................................................................................68
9.1.2.....Integral Action........................................................................................................................................................................................68
9.1.3.....Derivative Action....................................................................................................................................................................................69
9.1.4.....The combined effect of the three actions ..............................................................................................................................................69
9.2.... PSD2 POWER+ INVERTER USE .................................................................................................................................................................70

TM_i-BX(-N)_NC05_00_06_20_EN
MEHITS S.p.A. ● TECHNICAL MANUAL
Version NC05 - Translation of the Original Instructions
6
SYMBOLS:
A number of symbols are used to highlight some parts of the text that are of particular importance. These are described below.
CAUTION:
Information on the occurrence of situations/operations which, if ignored or not duly acted upon, could put not only the
Unit but also the functions of the Software and the various electronic parts at risk.
OBLIGATION:
Indicates the need to take appropriate precautions/perform specific activities to avoid compromising the protection of the
points of access only reserved for authorised operators and/or operators in charge of ensuring the normal operation of the
Unit
INFORMATION:
Indicates technical/functional information of particular importance which should not be overlooked.

TM_i-BX(-N)_NC05_00_06_20_EN
MEHITS S.p.A. ● TECHNICAL MANUAL
Version NC05 - Translation of the Original Instructions
7
1INTRODUCTION
This document discusses the functions of the “Nadisystem” controller used with i-BX and i-BX-N air/water units. The functions discussed only relate
to machine management issues (including the management of domestic hot water (DHW)).
Interfacing with i-BX and i-BX-N units will be guaranteed by the pLDPRO machine terminal, through which user, installer, service and manufacturer
will be able to access machine management and setup parameters (therefore, there will be 4 different password-protected access levels).
i-BX and i-BX-N units will be able to regulate the production of system water in a “traditional” manner, which means on the basis of a fixed setpoint
that can be set by the user, or in an “advanced” manner, based on a setpoint calculated through the offset functions, both cold and hot (for the details
see the specific function descriptions). The machine external air temperature probe will be used for offset management.
The type of regulation will be possible by setting specific parameters.
INFORMATION:
i-BX indicates the chiller only unit
i-BX-N indicates the reversible heat pump unit.
i-BX(-N) indicates both units, when discussing the machine functions.
1.1 OPERATING REQUIREMENTS
The application software discussed in this document is designed for use on i-BX-N reversible heat pump units and i-BX chiller units.
The software was designed for use on the following control systems:
uPC –Medium control board with pLDPRO graphic interface user terminal.
1.2 GENERAL FUNCTIONS
Below is a non-exhaustive list of the functions of the application:
•Regulation of the room temperature according to the setpoints entered using the user terminal.
•Complete visualisation of the operating status of the unit.
•Possibility of setting the regulation parameters, both the basic ones with the “User” password and the more advanced ones with the
“Installation”, “Service” and “Factory” passwords.
•Possibility of configuring the unit.
•Management and acoustic and visual signalling (visual only by default) of faults (alarms), events and maintenance, with memorisation up to
100 events.

TM_i-BX(-N)_NC05_00_06_20_EN
MEHITS S.p.A. ● TECHNICAL MANUAL
Version NC05 - Translation of the Original Instructions
8
2USER INTERFACE
2.1 USER TERMINAL
The interface that can be used with the controller is a pLDPRO interface with graphic display.
The connected pLDPRO interface does not have a sensor. Therefore, it can only guarantee unit control.
pld-PRO interface (on board of the unit):
2.1.1 BUTTONS GENERAL FUNCTIONS
Key
Description
[PRG key]: to access the main menu
[UP key]: moves around the masks and sets control parameter values
[DOWN key]: to navigate through the screen and set the control parameter values
[ENTER key]: to confirm the data entered
[ESC key]: goes back one level in the mask tree if you are in the header masks, or returns to the main
mask.
[ALARM button]: displays the alarms and resets normal operating conditions.
2.2 GENERAL CHARACTERISTICS OF THE INTERFACE
2.2.1 PASSWORD MANAGEMENT
By entering a numeric password it is possible to access four menu levels. The access levels are as follows:
•“User” password, for the standard user. 00 menu access.
•• “Installer” password, for the installer of the unit. 00, 01, 02, 03, 04, 06, 07, 09 menu access
•“Service” password, for maintenance and assistance operators. 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12 menu access
•• “Factory” password, for the sole and exclusive use of manufacturer’s personnel (not to be disclosed externally). Access to all menus:
00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12, 13, 14
To enter the password, type every single digit in the set order from left to right.
To move from one digit to the next press [ENTER].
If the cursor should be on the first digit to the left, then this brings back to the main window.
The following table shows the values of the “User”, “Installer” and “Service” passwords:
USER PASSWORD
INSTALLER PASSWORD
SERVICE PASSWORD
0012
0034
0738

TM_i-BX(-N)_NC05_00_06_20_EN
MEHITS S.p.A. ● TECHNICAL MANUAL
Version NC05 - Translation of the Original Instructions
9
2.2.2 MAIN MENU MASKS
Once the heat pump has been powered, the room control display shows
“Loading...”
After a few minutes, the display shows the first unit information summary
screen, confirming that the unit is ready for operation.
2.2.2.1 Main screen symbols
○,1 Time ( : )
○,6 System output water temperature
○,11 Compressor active
○,2 Date ( // )
○,7 External air temperature BT7
○,12 Type of operation
○,3 Day
○,8 Operating status (see below)
○,13 Domestic hot water 3-way valve in operation (i-BX-N
only)
○,4 Unit displayed
○,9 Fan in operation
○,14 Defrost active (i-BX-N only)
○,5 Domestic hot water storage tank temperature (i-BX-N
only)
○,10 Pump active
STATUS (8): Operating status of the unit. The values that can be displayed are the following:
•OFF CASC → OFF set from cascade
•OFF alarm → OFF due to alarm
•OFF DIN → OFF from digital input
•No req. → There is no heating/cooling request. The unit is not in operation as the setpoints have been met by the cascade configuration
•Unit ON → Status ON
•AntiFre. → Unit busy due to room antifreeze active
•D.Limit. → Unit off due to “demand limit” contact active
•Low fare → “Low energy tariff” contact active: unit producing DHW following the comfort setpoint
•Night lim. → Unit limited by Night mode
•Off Key → OFF from keypad

TM_i-BX(-N)_NC05_00_06_20_EN
MEHITS S.p.A. ● TECHNICAL MANUAL
Version NC05 - Translation of the Original Instructions
10
2.2.2.2 Main menu mask scrolling
The UP and DOWN keys can be used to display all the screens showing machine status real time data.
Some of these masks are only available to Service or Factory password holders.
High Temperature system side information
[Only visible if the zones are configured with parameter 016A]
○,1 Zone no.
○,5 Zone temperature setpoint
○,2 HT= High Temperature
○,6 Average external air temperature
○,3 Zone temperature
○,7 External air temperature
○,4 Zone Humidity
○,8 Pump status
Low Temperature system side information
[Only visible if the zones are configured with parameter 016A and parameter 0101=3]
○,1 Zone no.
○,7 External air temperature
○,2 LT= Low Temperature
○,8 Pump status
○,3 Zone temperature
○,9 Mixed water temperature
○,4 Zone Humidity
○,10 Mixing valve opening %
○,5 Zone temperature setpoint
○,11 Zone water setpoint
○,6 Average external air temperature
Thermostatic valve information
[Only visible with Service password]
○,1 Thermostat valve opening [step]
○,5 Evaporation temperature (calculated)
○,2 Thermostat valve opening [%]
○,6 Suction temperature
○,3 Valve status
-Std-by
○,7 Overheating (calculated ○,6-○,5)