SERVICE MANUAL EN - aermec.us sales service manuals sent from the... · • The alternating current power installation must use a transformer with voltage output of 24 Vac with safety

MULTI CONTROL

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MultiControl_Specifiche_SAT_Ed1

SERVICE MANUAL

VisentinG

Casella di testo

EN

Servizio Regolazione e Controllo File MultiControl_Specifiche_SAT_Ed1 Page 1/54

Revision 1 Date 23 October 2012 Author SAT Tipo Specification SAT

Summary

INTRODUCTION .......................................................................................................................................................... 3

Hardware Architecture ........................................................................................................................................... 3

SYSTEM STRUCTURE ................................................................................................................................................ 4

TYPES OF SYSTEMS ................................................................................................................................................... 5

VMF-CRP FOR THE MULTICONTROL SYSTEM ................................................................................................ 7

Connections of VMF CRP 1 (control of 3-way valves and sensors) ....................................................................... 8 Connections of VMF CRP 2 (control of immersion heater for domestic hot water) ............................................... 9 Connections of VMF CRP 3 (remote controls) ..................................................................................................... 10

SERIAL CONNECTION MULTI CONTROL ......................................................................................................... 11

USER INTERFACE PANEL MULTI CONTROL ................................................................................................... 12

MAIN SCREEN ........................................................................................................................................................... 13

HEAT PUMP MONITOR SCREEN .......................................................................................................................... 14

FUNCTIONS ................................................................................................................................................................ 15

BASIC USE PROCEDURES ......................................................... ERRORE. IL SEGNALIBRO NON È DEFINITO.

MAIN SCREEN SELECTION ................................................................................................................................... 16

UNIT OVERVIEW: MAIN SCREEN 1.0 .................................................................................................................. 17

UNIT OVERVIEW: PARAMETERS SCREEN 1.1 ................................................................................................. 18

UNIT OVERVIEW: TIME-CLOCK PROGRAMMING SCREEN 1.2 ................................................................. 19

DOMESTIC HOT WATER OVERVIEW: MAIN SCREEN 2.0 ............................................................................ 20

DOMESTIC HOT WATER OVERVIEW: TIME-CLOCK PROGRAMMING DHW 2.1 .................................. 21

DOMESTIC HOT WATER OVERVIEW: ANTI-LEGIONELLA MENU 2.2 ..................................................... 21

USER MENU SELECTION 3.0 .................................................................................................................................. 22

DATE AND TIME MENU: SETTING THE TIME 3.1.1 ........................................................................................ 22

DATE AND TIME MENU: SETTING THE DATE 3.1.2 ........................................................................................ 23

SEASON MENU: SETTING THE SEASON 3.2.1 ................................................................................................... 24

DISPLAY MENU: SETTING THE LANGUAGE 3.3.1 ........................................................................................... 24

DISPLAY MENU: SETTING THE CONTRAST 3.3.2 ............................................................................................ 25

DISPLAY MENU: SETTING THE SCREEN SAVER 3.3.3 ................................................................................... 25

ALARM HISTORY 4.0 ............................................................................................................................................... 26

SETUP MENU 5.0 ........................................................................................................................................................ 27

SETUP MENU: PASSWORD SCREEN 5.1 .............................................................................................................. 27

SYSTEM SETUP MENU: NUMBER OF UNITS 5.1.1.0 ......................................................................................... 28

SYSTEM SETUP MENU: STANDBY UNIT 5.1.1.1 ................................................................................................ 29

SYSTEM SETUP MENU: TYPE OF ROTATION 5.1.1.2 ...................................................................................... 29

SYSTEM SETUP MENU: TYPE OF CONTROL 5.1.1.3 ........................................................................................ 31

DELTA T Control ................................................................................................................................................. 32 FREE Control ....................................................................................................................................................... 33 LOAD Control ...................................................................................................................................................... 34

SYSTEM SETUP MENU: ON/OFF DELAY 5.1.1.4 ................................................................................................ 34



SYSTEM SETUP MENU: CAPACITY ON/OFF CHILLERS 5.1.1.5 .................................................................... 35

SYSTEM SETUP MENU: ON TEMPERATURE 5.1.1.6 ........................................................................................ 36

SYSTEM SETUP MENU: OFF TEMPERATURE 5.1.1.7 ...................................................................................... 36

UNIT SETUP MENU: HEATING SETPOINT 5.1.2.1 ............................................................................................. 38

UNIT SETUP MENU: COOLING SETPOINT 5.1.2.2 ............................................................................................ 38

UNIT SETUP MENU: SETPOINT COMPENSATION 5.1.2.3 ............................................................................... 39

UNIT SETUP MENU: TYPE OF UNIT 5.1.2.4 ......................................................................................................... 40

DHW SETUP MENU: NUMBER OF HEAT PUMP UNITS FOR DHW 5.1.3.0 .................................................. 41

DHW SETUP MENU: SIMULTANEOUS LOADS 5.1.3.1 ...................................................................................... 42

DHW SETUP MENU: DELAY START IMMERSION HEATER 5.1.3.2 ............................................................. 43

DHW SETUP MENU: VALVE ROTATION 5.1.3.3 ................................................................................................ 44

DHW SETUP MENU: ON/OFF RANGE 5.1.3.4 ...................................................................................................... 44

DHW SETUP MENU: HYSTERESIS DELTA 5.1.3.5 ............................................................................................. 45

DHW SETUP MENU: DEFROST POSITION 5.1.3.7 ............................................................................................. 46

SYSTEM SETUP MENU: REMOTE CONTROL 5.1.4.0 ....................................................................................... 47

SYSTEM SETUP MENU: BAUD RATE 5.1.4.1 ....................................................................................................... 53

SYSTEM SETUP MENU: SERIAL ADDRESS 5.1.4.2 ............................................................................................ 53

SYSTEM SETUP MENU: EXPANSION PRESENT 5.1.4.3 ................................................................................... 53



INTRODUCTION The Multicontrol is a control system dedicated to simultaneously manage several refrigeration units to:

Control starting, stopping and operating setpoint of a maximum of four units in autonomous mode or as

slaves in a system controlled by a BMS or supervisory system.

Remote control where the controls and information of a refrigeration unit/heat pump unit are centralised.

Hardware Architecture

The Multicontrol system hardware is characterised by the combination of electronic components:

Multicontrol board, with part number 9118368.

VMF-CRP expansion boards, with part number 9113073

Serial interface board for ModBus and supervisor systems or BMS (optional).

Sensor to locate in the DHW tank.

Sensor to locate at the inlet (SIW) or outlet (SUW) of the hydraulic parallel circuit SPLW.

External air sensor KSAE.



SYSTEM STRUCTURE

Figure 1: System structure for controlling multiple chillers in parallel

Figure 2: System structure as remote panel to chiller

RS485 serial for BMS

RS485 serial for VMF-Multichiller system

VMF

CRP1

VMF

CRP2

VMF

CRP3

SUPERVISOR

SYSTEM

OR BMS

VMF

MULTICONTROL

RS485 serial for BMS RS485 serial for VMF-Multichiller system

VMF

MULTICHILLER

SUPERVISOR

SYSTEM

OR BMS



TYPES OF SYSTEMS The VMF-Multichiller system is developed to manage the type of systems with configurations like the examples

shown below:

Figure 3: System with four chillers for producing the system water

System load

Decoupler

Primary circuit Secondary circuit

SIW

SUW



Figure 4: System with four chillers for the production of system water and domestic hot water

VMF-CRP (1) Accessory module for the control of:

• 3-way diverting valve

• System water inlet and outlet sensors (SIW, SUW)

• Domestic hot water tank sensor (SAS)

• Accessory KSAE for external air temperature sensor (SAE)

VMF CRP (2) Accessory module for the control of:

• Electric immersion heater in the domestic hot water tank

VMF CRP (3) Accessory module for the remote control of several functions:

• System On/Off, Alarm reset, Season changeover (through inputs)

• System alarms present, System status (ON/OFF), System season status (HEATING/COOLING), Alarm

present in one of the units



VMF-CRP for the MULTICONTROL system POWER SUPPLY

• The alternating current power installation must use a transformer with voltage output of 24 Vac with safety

Class II with at least 15 VA rating, for the power supply of only one expansion module, between terminals

G and G0.

• The power supply is functionally isolated from all the I/O and serial interfaces.

• A protective fuse of 800 mA is required for the power supply.

• It is recommended to keep apart the power supply of the expansion board pCOE from the rest of the

electrical devices (contactors and other electromechanical components) within the electrical panel.

• It is necessary to use a ferrite (type KITAGAWA part. n. RI 18-28-10 c0o7d8. 7C7aAreXlX 0) through which

the power supply cable must be twice wound round.

• The minimum cable cross section for the power supply cable must be 1mm.

EXAMPLE ADDRESS 1 EXAMPLE ADDRESS 5

LED signal description

LED red LED yellow LED green description

on on Communication active and functioning

on Sensor error

on Software error, contact Aermec

flashing on Loss of communication (check addresses, cables)

Awaiting system initialisation from the master (max. 30 s)



Connections of VMF CRP 1 (control of 3-way valves and sensors)

Code Component Input to enable the sensor Available as

SIW Primary hydraulic circuit INLET water sensor ID1 (CLOSED) on terminal J4 Accessory SPLW (1) SUW Secondary hydraulic circuit OULET water sensor ID2 (CLOSED) on terminal J4 Accessory SPLW (2) AE External air sensor ID3 (CLOSED) on terminal J4 Accessory KSAE AS Domestic hot water tank sensor ID4 (CLOSED) on terminal J4 Accessory SDHW

Code Valve controller Output Available as 3VD (1) 3-way diverting valve unit 1 J5 Component NOT supplied 3VD (2) 3-way diverting valve unit 2 J6 Component NOT supplied 3VD (3) 3-way diverting valve unit 3 J7 Component NOT supplied 3VD (4) 3-way diverting valve unit 4 J8 Component NOT supplied



Connections of VMF CRP 2 (control of immersion heater for domestic hot water)

Code Component Output Available as

RAS Control electric immersion heater for domestic hot water J5 Component NOT supplied

Code Component Input Available as ARE Heater alarm present input ID1 CLOSED= No alarm / ID1 OPEN= Alarm J4 Component NOT supplied PRE Enable heater present CLOSED= Heater present in system / OPEN= No heater in system J4

Component NOT supplied



Connections of VMF CRP 3 (remote controls)

Output Code Function Status Status

J5 ASG General System Alarm (system alarm present) Closed = System alarm Open = No system alarm J6 SGS General System Status Closed = System is ON Open = System is OFF J7 SSI System Season Status Closed = WINTER Open = SUMMER J8 ASM Unit System Alarm (an alarm present in one of the units) Closed = Alarm present Open = No alarm present

Input Code Function Status Status

ID1 AGI General System Enable Closed = System enabled Open = System disable ID2 RGS Reset General System Closed = Reset system ID3 CCS Control Season Change Closed = WINTER setting Open = SUMMER setting



Serial connection MULTI CONTROL WARNING: If the Multicontrol is installed in a system controlled through the VMF system any control of the

production of domestic hot water must be done by the Multicontrol (the accessory VMF-ACS is not compatible with

the Multicontrol accessory, hence both cannot be present in the same system).



User interface panel MULTI CONTROL The accessory MULTICONTROL allows the control and management of up to four chillers (fitted with the

MODUCONTROL electronic board); through this accessory the user can control:

• ON/OFF of the unit (based on the selected logic)

• Reading of chiller parameters (temperatures, pressures, setpoints, etc.)

• Time-clock control (up to two daily settings for each day of the week)

• Control of domestic hot water (production DHW, time-clock control of DHW, anti-legionella cycle, etc.)

• Control of operating mode (cooling or heating mode operation)

• Alarm history (the systems allows the recording of the last 10 system alarms).

Warning: to use some of the system functions it is necessary to use one or more VMF-CRP modules, as shown in

the system schematic.

Key Function

A ON/OFF key

B C D E

Multi-function keys; the associated

functionality changes based on which

screen is shown on the display

F Key to select and confirm (Enter)

G Key to decrease value (-)

H Key to increase value (+)

I White back-lit LCD display128 x 64 pixel

L LED not used

M LED not used

N LED red when signalling alarm present



MAIN SCREEN Main screen where the principal parameters of the refrigeration units is shown. From this point all other sub-menus

can be accessed. The following describes the icons displayed:

In the “Chiller status” the chillers present in the system are identified and for each of these the following displays

are possible:

• indicates that the chiller is OFF from local or remote control

• indicates that the chiller is in standby mode

• indicates the chiller circulator is active

• indicates that the chiller compressor + circulator is active

• indicates that the chiller is not communicating with the ModBus network

• indicates a chiller fault is present

• indicates that the chiller is in defrost mode

Figure 5: Main screen

General

On/Off

Operating

season Chiller status

Alarm present

Time-clock

present

Day, date, time

System leaving water

temperature

System entering water

temperature

Unit number (U1, U2, U3, U4, MIX)

External air

temperature



Heat pump monitor screen In this screen the characteristics of the heat pump thermostat controllers is summarised.

System

On/Off

Change tab to show

unit data

To sub-menu of application

MAIN

PAGE

Icon indicating the heat

pump status

Demand (%) of each

chiller thermostat

Capacity (%) actually required

for compressor of each chiller

Entering water

temperature each chiller

Chiller number

Leaving water

temperature each chiller



FUNCTIONS

Figure 6: Application menu structure

UNIT OVERVIEW

UNIT PARAMETERS

CHILLER TIMER SCHEDULE

MAIN SCREEN

DOMESTIC HOT WATER OVERVIEW

USER SUB-MENU

PASSWORD SCREEN ALARM HISTORY

SET TIME

NUMBER CHILLERS 303

HEAING SETPOINT 101

SET DATE

SET LANGUAGE

SET CONTRAST

SET SEASON

DHW TIMER SCHEDULE

SELECTION MENU

SETUP MENU

SET SCREENSAVER

ANTI-LEGIONELLA

STANDBY CHILLER PRESENT

TYPE OF ROTATION

TYPE OF CONTROL

ON/OFF CHILLERS DELAY TIMER

% CAPACITY CHILLERS FOR ON/OFF

START TEMP CHILLERS

STOP TEMP CHILLERS

COOLING SETPOINT

SETPONT COMPENSATION

NUMBER OF HEAT PUMP UNITS FOR DHW 303

SERIAL ADDRESS

BAUD RATE

ENABLE REMOTE CONTROL 101

PRESENCE SENSORS/VALVES

PRESENCE I/O

SIMULTANEOUS LOADS

DELAY STARTING IMMERSION HEATER

VALVE ROTATION

ON/OFF RANGE

DIFFERTIAL START NEXT HEAT PUMP UNIT

TYPE OF UNIT

TYPE OF DEFROST

RS485 NETWORK STATUS

Technician 303

User 101

LEGEND:

HEAT PUMP MONITOR



Main screen selection From this screen it is possible to see the required menu.

From the selections of the main screen the following can be accessed:

• UNIT OVERVIEW

• DHW OVERVIEW (displayed if enabled in the system)

• USER MENU

• SETUP MENU

• ALARM HISTORY

Figure 7: Menu selection

Line identifying the

selected menu

Keys used to select the

menu



Unit overview: main screen 1.0 From the unit overview the operating status of each unit in the system can be seen.

If a chiller alarm is present the unit overview screen becomes:

To change the index value of the chiller to be displayed follow this procedure:

1. Press the key

2. With the keys and increase/decrease the index, range 1 to 4

3. Press the key to confirm the data

Through the keys and the display passes between the previous or next screen of the application.

Index of chiller being

displayed

Unit status

Operating

Leaving unit temperature

macchina

Setpoint temperature

Unit enabling

Present alarm reset key

Active alarm code



Unit overview: parameters screen 1.1 From the chiller overview main screen the screen for reading the parameters of the chiller can be accessed.

The parameters that can be displayed are:

Parameter Description ANL ANLi

ANR

ANF SRP

ANL-C WRL ANKi

TYPE Type of unit TIA Water inlet temperature TUA Water outlet temperature TSB Coil temperature TGP Discharge gas temperature SIWH Water inlet temperature (condenser)

SUWH Water outlet temperature (condenser)

TAE External air temperature AP High pressure BP Low pressure HC0 Primary circuit compressor operating hours SP0 Primary circuit compressor number of starts REL PRIMARY software version BLD SECONDARY software version SET Unit control setpoint HC1 Secondary circuit compressor operating hours SP1 Secondary circuit compressor number of starts STF Cooling setpoint STC Heating setpoint SAS Domestic hot water setpoint PT Capacity percentage requested by the thermostat PO Capacity provided by the unit (on/off units) or operating frequency (units

with inverter compressors)


Line that identifies

the parameter Parameter

Keys to select the

parameter to display



Unit overview: time-clock programming screen 1.2 For each chiller it is possible to enable the time-clock programming. This allows a maximum of two daily settings for

each day of the week.

It is possible to have chillers with time-clock programmes in a system (the same for each) and other chillers

enabled and operating without any daily restriction. This is all at the discretion of the system user.

To utilise the two time-clock programmes set all the parameters for the first and second daily time-clock

programmes.

To utilise just one time-clock programme leave the parameters as 00:00 in the second time-clock programme.

00:00 23:59 On 1 Stop 1 On 2 Stop 2

Time-clock 1 Time-clock 2

OFF OFF OFF ON ON

00:00 23:59 On 1 Stop 1

Time-clock 1

OFF OFF ON

First daily

time-clock

Second daily time-

clock

Programme day

Chiller/heat pump

index

Key to enable time-clock

programme for the specific

chiller

Copy programme key

for every days of the

week Key to change day of the

week



To set the time-clock programme follow this procedure:

1. Press the key

2. With the keys and increase/decrease the hour/minutes fields selected

3. Press the key to confirm and save the data

4. Repeat the procedure from step 2 until the field for the minutes to STOP the second time-clock.


Domestic hot water overview: main screen 2.0 From the domestic hot water overview the relevant parameters for the production of domestic hot water are

displayed.

In this screen the required temperature for the domestic hot water can be set and can also be linked to the

maximum operating temperature of the heat pump unit present in the system, or not linked from this limit if there is

installed an immersion heater/boiler for DHW.

To change the value of “DHW temperature” follow this procedure:

1. Press the key

2. With the keys and increase/decrease the value, range 20.0 to 70.0 °C



DHW

temperature

DHW setpoint

Storage tank

overview

Manual enabling

immersion

heater

Enabling DHW production



Domestic hot water overview: time-clock programming DHW 2.1 In this screen the production of hot water time-clock can be programmed. This menu is very similar to that of the

chiller: for further information refer to that section.


Domestic hot water overview: anti-legionella menu 2.2

To programme the parameters of the anti-legionella cycle:

1. Press the key

2. With the keys and increase/decrease the value of the hour or whether it is enabled/disabled the

day of the week


4. Repeat the procedure from item 2 until the last field (DOM)


Start time of anti-legionella

cycle

Day anti-legionella cycle is

enabled

Enabling anti-

legionella cycle



The anti-legionella cycle brings the temperature of the domestic hot water storage tank up 65 °C for 3 minutes. To

do this the system begins the phase by starting the heat pump units available for heating the water up to their

maximum working temperature. Reaching the end temperature of the cycle is achieved by a second step by

activating the immersion electrical heater fitted in the tank.

User menu selection 3.0 From this screen the user menu to be displayed can be selected.

From the selection of user menu access is made to:

• date/time menu

• display menu

• operating season menu

Date and time menu: setting the time 3.1.1 In this screen the time can be set for the system panel.

To change the hour follow this procedure:

Keys to select the user

menu

Line showing the user

menu selected



1. Press the key

2. With the keys and increase/decrease the value


4. Repeat the procedure from item 2 until the seconds are modified


Date and time menu: setting the date 3.1.2 In this page the date of the system can be set.

To change the date and day follow this procedure:

1. Press the key

2. With the keys and increase/decrease the value or the line


4. Repeat the procedure from item 2 until the modification of the day




Season menu: setting the season 3.2.1 In this screen the operating season of the system can be set.

To change the season follow this procedure:

1. Press the key

2. With the keys and select from the two options: SUMMER, WINTER



Display menu: setting the language 3.3.1 In this screen the reference language for the lines shown on the system can be set.

To change the language follow this procedure:

1. Press the key

2. With the keys and select from the five options: Italian, English, French, German, Spanish





Display menu: setting the contrast 3.3.2 In this screen the LCD contrast can be set to improve the visibility of the screens.

To change the value of the contrast follow this procedure:

1. Press the key

2. With the keys and increase/decrease the value of the contrast, range: 0 to 100 %



Display menu: setting the screen saver 3.3.3 In this screen the functionality of the screen saver can be set. This function allows the user to set a timer for the

application to force the display of the main screen.

To change the value of the screen saver follow this procedure:

1. Press the key

2. With the keys and increase/decrease the screen saver timer, range: 0 to 60 minutes


The icon present in the screen will be shown as:



• for screen saver values greater than 0 (screen saver active)

• for screen saver value equal to 0 (screen saver not active)


Alarm history 4.0 In this screen the last (maximum 10) system alarms can be seen.

Alarm source Alarm name Description

System Eeprom error Initialisation error of the Multicontrol memory

Unit

Not connected Unit not connected to the RS485 network of the VMF-Multichiller

AL xxx (alarm code given by the unit: see the

alarm code generated by the board)

Alarm defined by the unit

DHW

No anti-legionella The anti-legionella cycle did not terminate correctly

No hot water The DHW production cycle did not terminate correctly

DHW setting error The operating setpoint is greater than the maximum working

temperature of the heat pump unit and there is no immersion heater

VMF CRP 1

Expansion not connected Expansion not connected to RS485 network of VMF-Multichiller

SUW sensor faulty Leaving mixed water temperature sensor faulty

SIW sensor faulty Entering mixed water temperature sensor faulty

SSAN sensor faulty DHW sensor faulty

SAMB sensor faulty External air temperature sensor faulty

VMF CRP 2 Expansion not connected Expansion not connected to RS485 network of VMF-Multichiller

Heater faulty Immersion heater faulty

VMF CRP 3 Expansion not connected Expansion not connected to RS485 network of VMF-Multichiller

Index of the

alarm

history

Line that identifies the system

element that generated the

alarm

Line that identifies the

type of alarm

Alarm history

reset key Time and date of

alarm event



Setup menu 5.0 In this screen the specific installation/setup menu can be selected.

The user can access the following from this menu:

• system setup

• setup chillers/heat pump units

• setup DHW

• system setup.

Setup menu: password screen 5.1 To access the menus below insert the password relevant to the level of access.

With password:

• 101 (user): only the parameters accessible to the user are displayed

• 303 (technician): displays all the parameters

Field to insert

the password

Line that shows the application

software version



To enter the password follow this procedure:

1. Press the key

2. With the keys and increase/decrease the selected digit


4. Repeat item 2 of the procedure until the third digit

System setup menu: number of units 5.1.1.0 In this screen the number of chillers/heat pump units present in the system are shown. Access level: technician

303.

To show the number of units present in the system follow this procedure:

1. Press the key

2. With the keys and increase/decrease the data, range 0 to 4



Legend: Address underlined shows

any standby unit

Unit 1 Unit 2 Unit 3 Unit 4

Number of chillers Address Address Address Address

1 200 // // //

2 // 201 // //

3 // // 202 //

4 // // // 203

Table 1: ModBus addresses of the units present in the system



System setup menu: standby unit 5.1.1.1 In this screen the presence of any standby chiller/heat pump unit is shown. Access level: technician 303.

Systems with a standby unit have available a unit that is only activated if there is a fault with the main group. The

standby unit is identified in the system with the highest modbus address (see Table 1).

To select the presence of a standby chiller follow this procedure:

1. Press the key

2. With the keys and select the line “PRESENTE” (present) or “ASSENTE” (absent)



System setup menu: type of rotation 5.1.1.2 In this menu the choice of how the units will be activated or deactivated during the control of the system can be

made. Access level: technician 303.

To select the type of rotation follow this procedure:

1. Press the key

2. With the keys and select the line “FISSA” (fixed) or “EQUILIBRATA” (balanced)





FISSA (fixed): With fixed type of rotation the switch on and switch off sequence is determined as shown in the

figure:

EQUILIBRATA (balanced): This logic balances the operating hours of the units; practically the unit with the least

operating hours is started first, following this logic with the subsequent units.

For example:

T0 start Figure 8: Fixed starting sequence

C 1 C 2 C 3 C 4

Figure 9: Fixed stopping sequence

C 4 C 3 C 2 C 1

T0 stop

C 4

T0 start

C 1

C 2 C 3

Com

pres

sor o

pera

ting

hour

s



Whilst the stopping sequence the unit with the highest operating hours is stopped first, following the same logic

with subsequent units. This type of rotation ensures that the units are enabled and disabled in a manner to ensure

equal operating hours.

For example:

Note: The parameter “Tipo di rotazione” (type of rotation) is not considered during the production of domestic hot water.

In this mode the rotation control rule is FIFO (first in first out) and is tied to the index (ModBus serial number) of the

unit.

System setup menu: type of control 5.1.1.3 In this screen the control mode required for the system use is selected. Access level: technician 303.

To select the type of control follow this procedure:

C 1

C 2

C 4

Com

pres

sor o

pera

ting

hour

s

T0 stop

C 3

Figure 10: Start/stop sequence during the production of domestic hot water

C 4 C 3 C 2 C 1

T start DHW T stop DHW



Press the key

1. With the keys and select the line “CARICO” (load), “DELTA T” or “LIBERO” (free)



DELTA T Control

With “DELTA T” control the type of hydraulic system used has to be defined, which can be:

• Single circuit [ ]

• Double circuit [ ]

Specifically, the menu “Tipo di regolazione” (type of control) is shown as in the following figure:

With the control for “DELTA T” the units are controlled in relation to the operating season and the entering and leaving temperature of the units. To use this control method the expansion module VMF-CRP1 has to be

installed. In this mode for each unit it is determined:

Enabling in relation to the system

Enabling in relation to the operating season

Switch on in relation to the trend of water temperature produced by the units and accordingly dictated by

the type of rotation

Operating setpoint (fixed or with compensation)

Unit diagnostics

As noted before, the installer must set the system type for this mode of control (single/double circuit). This parameter is fundamental for the correct control of the units.

Key to change

system type

Icon defining the

type of system



For double circuit systems and specifically for systems where the secondary circuit water flow is by an independent

pump, the SUW sensor must accurately read the liquid temperature to ensure the correct control operation. In these types of system all the units (and their circulators) can be switched off once the load is met.

For single circuit systems the water flow (and hence reading of the sensor SUW) is ensured by the circulators

present in the units. In these types of systems at least one unit must be operating, even when the load is met. To configure the correct mode of operation for the units the following parameters must be set for this mode:

On/Off Delay Temperature On Temperature Off Type of installation

FREE Control

With the “LIBERA” (free) control the units are controlled independently, and for each is determined:


Operating setpoint (fixed or with compensation)

Unit diagnostics

In this mode the units are not forced start/stop in relation to the load, and the units control autonomously in relation

to their own thermostat.

An example of this type of control is four pipe systems (producing simultaneous cold ad hot water).

The DELTA T mode requires the following:

VMF-CRP1 present

SUW sensor active

SIW sensor active

If any one of these is missing the system will change to the FREE mode.



LOAD Control

With the “CARICO” (load) control are controlled in relation to the operating season and the effective load demand

determined analysing the unit thermostats for the running units. For each is determined:


Enabling in relation to the operating season

Enabling in relation to the load demand and according to the sequence determined by the type of rotation

Operating setpoint (fixed or compensation)

Unit diagnostics

To correctly configure the unit operation in this mode the following parameters must be set:

On/Off Delay On/Off Capacity

System setup menu: ON/OFF delay 5.1.1.4 In this screen the start and stop delay timers for the chillers can be selected according to the selected control logic

(for Load or Delta T). Access level: user 101.

To select the delay times follow this procedure:

1. Press the key

2. With the keys and increase/decrease the value, range 0 to 300 s


4. Repeat the procedure from item 2 until the ON->OFF field


Delay start timer: shows the required time that must pass from the system capacity request to the enabling of the required unit

Delay stop timer: shows the require time that must pass from the system reaching requested capacity to stopping of the required unit



System setup menu: capacity ON/OFF chillers 5.1.1.5 In this screen the capacity percentages (obtained from the thermostats of the various refrigeration units) can be set

for the levels to start or stop the next chiller. These parameters are used when Type of control is set as load.

Access level: user 101.

To set the ON/OFF capacities follow this procedure:

1. Press the key

2. With the keys and increase/decrease the value, range 0 to 100 %


4. Repeat the procedure from item 2 until the ON->OFF Next field


SUW

ON

/OFF

CH

ILLE

R

STA

TUS

CH

ILLE

R

[s]

[s]

[s]Delay OFF → ON Delay ON → OFF

Capacity level needed to start a further unit: shows the minimum percentage value that must be required from each thermostat of running units before starting the next unit. The capacity of the first unit must reach 80% before starting the second

Capacity level needed to stop a further unit: shows the maximum percentage value that must be required from each thermostat of running units before stopping the last unit. The capacity of the first units must reach 40% before stopping the second



System setup menu: ON temperature 5.1.1.6 In this screen the start temperature (referring to the system SUW sensor) can be set for the various units in the

system. This parameter is used when the Control type is set as DELTA T.


To set the chiller ON temperature follow this procedure:

1. Press the key

2. With the keys and increase/decrease the value, range -10.0 to 70.0 [°C]



System setup menu: OFF temperature 5.1.1.7 In this screen the stop temperature (referring to the system SIW sensor) can be set for the various units in the

system. This parameter is used when the Control type is set as DELTA T.


To set the chiller OFF temperature follow this procedures:

Change parameter for the

operating season

Unit active season setting: shows which season the displayed setpoint refers to

Unit active setting: shows the temperature read by sensor SUW in the secondary circuit as activation threshold for the units (depending on the season the demand is activated above or below the threshold set in this parameter)

Unit selected

Keys to increase/decrease the chiller index

Change parameter for the

operating season

Unit disabling setting: shows the temperature (sensor SIW) of the primary circuit return water considered the stop threshold of the corresponding unit (depending on the season the demand is activated above or below the threshold set in this parameter)

Shows the season the unit refers to



1. Press the key




The temperature control of the chillers/heat pump units can only be carried out with the presence in the system of

the VMF-CRP1 expansion board which monitors the sensors SUW and SIW.

STOP C4

STOP C3

STOP C2

STOP C1

SUW

SIW

[S]

[S]

[S]

[S]

[S]

CH

ILLE

R1

CH

ILLE

R2

CH

ILLE

R3

CH

ILLE

R4

SECONDARY

SUW

SIW

START



Unit setup menu: heating setpoint 5.1.2.1 In this screen the heating mode leaving water setpoint of the heat pump unit can be set.

Access level: user.

To set the heating setpoint follow this procedure:

1. Press the key

2. With the keys and increase/decrease the value, range 10.0 to 70.0 [°C]



Unit setup menu: cooling setpoint 5.1.2.2 In this screen the cooling mode leaving water setpoint of the chiller can be set.

Access level: user.

To set the cooling setpoint follow this procedure:

1. Press the key




Keys to change

values

Unit index being

configured



Unit setup menu: setpoint compensation 5.1.2.3 In this screen the external ambient based setpoint compensation for the chillers/heat pump units can be set. The

sensor to read the external air temperature can be:

1. Sensor S AMB

2. The average of the sensors installed in the units if the S AMB sensor is not present or faulty. Access level:

technician.

To set the compensation setpoint for the chillers/heat pumps units follow this procedure:

1. Press the key

2. With the keys and increase/decrease the value, range +20.0 to 70.0 [°C]


4. Repeat the procedure from item 2 until the Tua2 field


Enabling key for the compensation setpoint of the unit

Key to select summer or winter curve

Icon that represents the

slope of the curve

Show whether the data refers to the compensation in cooling or heating mode

Shows the minimum external air temperature for compensation: depending on operating mode (cooling or heating) this value will be connected to the minimum or maximum leaving water value setpoint, as shown in the graphs below

Shows the maximum external air temperature for compensation: depending on operating mode (cooling or heating) this value will be connected to the minimum or maximum leaving water value setpoint, as shown in the graphs below

Shows the minimum or maximum operating setpoint (based on heating or cooling mode) connected to the MINIMUM air temperature

Shows the minimum or maximum operating setpoint (based on heating or cooling mode) connected to the MAXIMUM temperature

Tua1 12°C

Tua2 7°C

Tae1 30°C

Tae2 35°C TAext [°C]

TWout [°C] Tua2 35°C

Tua1 40°C

Tae1 -0.5°C

Tae2 15°C



Unit setup menu: type of unit 5.1.2.4

In this screen the type of unit installed in the system can be set. Access level: technician.

To set the unit type follow this procedure:

1. Press the key

2. With the keys and select one of the lines: SOLO FREDDO (cooling only), SOLO CALDO

(heating only), POMPA DI CALORE (heat pump unit)



This parameter is fundamental for systems with different unit types (cooling only, heating only, heat pump units).



DHW setup menu: number of heat pump units for DHW 5.1.3.0

In this screen the number of units used for the production of domestic hot water is selected. This parameter also

includes any standby unit (if it has been specified in the relevant parameter System setup menu: standby chiller).

Access level: technician.

To set the number of heat pump units for the production of hot water:

1. Press the key

2. With the keys and increase/decrease the data, range 0 to 4



WARNING: to correctly set the unit control for the production of DHW the following instructions must be followed:

Unit modbus address: the units must have a specific modbus address to be correctly controlled by the

MULTICONTROL accessory. This address can only be set on the panel of the unit. The addresses to set depend

on the number and functions of the units in the system. To determine the correct addresses to apply to the units for

the production of DHW refer to the summary table on the next page.

Type of unit: in the event that there is a standby chiller in the system this unit will have the highest modbus

address and all the units have to be enabled for DHW production, hence they must all the heat pump units or

heating only units.

Type of system for DHW production: In this type of system, where a standby unit is required also for the

domestic hot water, it is required that ALL the units controlled from the MULTICONTROL are units suitable for the

production of domestic hot water (HEAT PUMP UNITS or HEATING ONLY UNITS). The standby unit is always the

last unit and the unit with the highest serial address number. This unit is not activated during the production of

domestic hot but will operate only if one or more of the main group are not available.



Number of

units for

DHW

System with 4 heat pump units System with 3 heat pump units System with 2 heat pump

units

System with 1 heat

pump unit

Add:200 Add:201 Add:202 Add:203 Add:200 Add:201 Add:202 Add:200 Add:201 Add:200

4 // // // // // //

3 // // // //

2 // // // //

1 // // // // // //

Legend: DHW standby unit. DHW unit

Type of system for the production of DHW without standby chiller: The first three types of systems have one or more units for the production of DHW, although there can be other

cooling only chillers. In this case it is mandatory that the units and any cooling only chillers are set with the

remaining available serial addresses.

DHW setup menu: simultaneous loads 5.1.3.1

In this screen simultaneous system loads can be set as enabled (ON) or disabled (OFF).

Access level: user.

To enable or disable simultaneous loads:

1. Press the key

2. With the keys and select the ON or OFF line





If “abilitazione carichi” (loads enabled) is ON the system can consider the case of simultaneous operation between

heat pump unit (intended as compressor and/or supplementary heater mounted on the refrigeration unit) and

immersion heater mounted in the domestic hot water. This method of operation can be used if there are no

electrical power supply limits.

If there are electrical power supply limits, or if electrical consumption is to be minimised, the “abilitazione carichi”

(loads enabled) is set to OFF.

DHW setup menu: delay start immersion heater 5.1.3.2 In this screen the delay start for the immersion heater in the domestic hot water storage tank can be set.

Access level: user.

To set the immersion heater delay start:

1. Press the key

2. With the keys and increase/decrease the data, range 0 to 60 [m]



This parameter is used whilst the heat pump unit produces domestic hot water. During this whole cycle a timer is

present which increases in value if the liquid temperature inside the storage tank drops or remains constant. If the

value of “ritardo accensione R.A.S.” (immersion heater delay start) reaches the set value the system starts the

operation of the immersion heater to make up any deficiency from the heat pump unit.

To disable the immersion heater it is sufficient to set the delay parameter to “0”.



DHW setup menu: valve rotation 5.1.3.3 In this screen the time required for the diverting/mixing valve to switch can be set.


To set the valve rotation parameter:

1. Press the key

2. With the keys and increase/decrease the data, range 0 to 120 [s]



This parameter is used when the heat pump unit is enabled for the production of domestic hot water. It is a delay

timer in which the unit is disabled during the time the valve switches to avoid a unit trip through reduction of flow

rate.

DHW setup menu: on/off range 5.1.3.4 In this screen the “Banda On/Off” (on/off range) can be seen or modified, which represents the hysteresis between

maximum and minimum temperatures for the domestic hot water. Access level: user.

To set the on/off range ON/OFF:

1. Press the key

2. With the keys and increase/decrease the data, range 0 to 10.0°C





This parameter is used in conjunction with the “Temperatura acqua” (water temperature) to determine the switch on

and switch off threshold for the production of domestic hot water.

DHW setup menu: hysteresis delta 5.1.3.5 In this screen the operating hysteresis for the various heat pump units enabled for the production of domestic hot

water can be set.


To set the hysteresis parameter:

1. Press the key

2. With the keys and increase/decrease the data, range 0 to10.0°C



The sixth screen of the DHW SETUP allows the setting of a delta to be applied for the domestic hot water setpoint

for the units used in the production of domestic hot water. This function permits (in the case there are several units

for the production of domestic hot water) to off-load the units delegated to the production of DHW, moving the

setpoint of these units by the value specified in this parameter.

DHW SETPOINT - RANGE DHW SETPOINT + RANGE



In practice this activates in cascade the heat pump units in relation to the effective heating load demand. If the

“delta hysteresis) is set to 0 all the unit will follow the same routine during the production of domestic hot water

cycle.

DHW setup menu: defrost position 5.1.3.7 In this screen the defrost direction which is only by reversing cycle can be set.

SYSTEM: the water flow is directed towards the system. In this case the flow proving check will be disabled for the

time specified in the relevant parameter, to avoid flow switch alarms during the rotation of the valve.

DHW: the flow remains in the DHW circuit.


To set the defrost position parameter:

1. Press the key

2. With the keys and select the line IMPIANTO (system) or SANITARIO (DHW)





System setup menu: remote control 5.1.4.0

This screen of the SYSTEM SETUP allows the setting of the type of remote control (if present) to be applied to the

MULTICONTROL. Access level: user.

To set the remote control parameter:

1. Press the key

2. With the keys and select the line NON PRESENTE (not present), DA SERIALE MODBUS (from

Modbus serial line), DA MODULO VMF CRP 3 (from module VMF CRP3)



The values available for this parameter are:

FROM MODULE VMF CRP3: Shows that the remote control is from the VMF CRP3 accessory module installed.

For further information refer to the installation section of this manual FROM MODBUS SERIAL LINE: Shows that the system is controlled by a BMS supervisory system. This system is

defined from the list of variables specified in the following pages. NOT PRESENT: no remote control is present.



Remote control from MODBUS SERIAL LINE

ModBus local network

ModBus supervisor

SUPERVISOR

OR

BMS

Supervisor serial expansion

board. The –Multichiller

controller is a slave of the

supervisor serial network.

A B GND



MODBUS VARIABLES FOR VMF‐MULTICHILLER CONTROLLER (SYSTEM SETTINGS)

ModBus Variable

Address Access type

Min Value

Max Value

Unit of measurement

ModBusControl

Description 0x03 0x06 0x10

PLANT_ON 0 R/W 0 1 // Si Si Si General system On‐Off

UNITA1_EN 1 R/W 0 1 // Si Si Si Enabling unit 1




ACS_EN 5 R/W 0 1 // Si Si Si Enabling domestic hot water production

ACS_RAS_EN 6 R/W 0 1 // Si Si Si Forced enabling immersion heater for DHW

ACS_SET 7 R/W 200 700 /10 °C Si Si Si Temperature setpoint for domestic hot water

ACS_EN_LEG 8 R/W 0 1 // Si Si Si Enabling anti‐legionella cycle

STAGIONE_FUNZ 9 R/W 0 1 // Si Si Si System operating season

SET_CALDO_M1 10 R/W 200 700 /10 °C Si Si Si Heating setpoint for unit 1

SET_FREDDO_M1 11 R/W ‐100 300 /10 °C Si Si Si Heating setpoint for unit 1







UNITA1_EN_PROG 18 R 0 1 // Si No No Enabling time‐clock for unit 1




ACS_EN_LEG_DAY 22 R 0 127 // Si No No Days enabling the anti‐legionella cycle

ON_OF_LEG 23 R 0 5947 // Si No No Start time anti‐legionella cycle

ACS_EN_PRG 24 R 0 1 // Si No No Enabling time‐clock for production of DHW

SEL_LINGUA 25 R 0 4 // Si No No Display language

CONTRASTO_LCD 26 R 0 100 % Si No No LCD contrast

SCREEN_SAVER 27 R 0 60 s Si No No Screen saver

NUM_MACCHINE 28 R 0 4 // Si No No Number of units present in the system

PRES_RISERVA 29 R 0 1 // Si No No Standby unit present

TIPO_ROTAZIONE 30 R 0 1 // Si No No Rotation type selected for the units

TIPO_REGOLAZIONE 31 R 0 2 // Si No No Control type selected for the units

RIT_ON 32 R 0 360 s Si No No Delay start for next unit

RIT_OFF 33 R 0 360 s Si No No Delay stop for the unit

POT_ON 34 R 0 100 % Si No No Capacity percentage threshold for starting next unit

POT_OFF 35 R 0 100 % Si No No Capacity percentage threshold for stopping next unit

T_START_C 36 R ‐100 300 /10 °C Si No No Start temperature in cooling mode during operation "Regolazione per Delta T"

T_START_H 37 R 200 700 /10 °C Si No No Start temperature in heating mode during operation "Regolazione per Delta T"

T_STOP_C1 38 R ‐100 300 /10 °C Si No No Stop temperature in cooling mode of the first unit during operation "Regolazione per Delta T"



T_STOP_H1 39 R 200 700 /10 °C Si No No Stop temperature in heating mode of the first unit during operation "Regolazione per Delta T"

T_STOP_C2 40 R ‐100 300 /10 °C Si No No Stop temperature in cooling mode of the second unit during operation "Regolazione per Delta T"

T_STOP_H2 41 R 200 700 /10 °C Si No No Stop temperature in heating mode of the second unit during operation "Regolazione per Delta T"

T_STOP_C3 42 R ‐100 300 /10 °C Si No No Stop temperature in cooling mode of the third unit during operation "Regolazione per Delta T"

T_STOP_H3 43 R 200 700 /10 °C Si No No Stop temperature in heating mode of the third unit during operation "Regolazione per Delta T"

T_STOP_C4 44 R ‐100 300 /10 °C Si No No Stop temperature in cooling mode of the fourth unit during operation "Regolazione per Delta T"

T_STOP_H4 45 R 200 700 /10 °C Si No No Stop temperature in heating mode of the fourth unit during operation "Regolazione per Delta T"

TAE1_E 46 R ‐200 700 /10 °C Si No No External air temperature threshold Px1 during summer operation

TUA1_E 47 R ‐200 700 /10 °C Si No No Leaving water temperature threshold Py1 during summer operation

TAE2_E 48 R ‐200 700 /10 °C Si No No External air temperature threshold Px2 during summer operation

TUA2_E 49 R ‐200 700 /10 °C Si No No Leaving water temperature threshold Py2 during summer operation

TAE1_I 50 R ‐200 700 /10 °C Si No No External air temperature threshold Px1 during winter operation

TUA1_I 51 R ‐200 700 /10 °C Si No No Leaving water temperature threshold Py1 during winter operation

TAE2_I 52 R ‐200 700 /10 °C Si No No External air temperature threshold Px2 during winter operation

TUA2_I 53 R ‐200 700 /10 °C Si No No Leaving water temperature threshold Py2 during winter operation

ENABLE_CLIMATICA 54 R 0 1 // Si No No Enabling ambient based curve

TIPO_MACCHINA_M1 55 R 0 2 // Si No No Type of unit 1




NUM_MAC_ACS 59 R 0 4 // Si No No Number of units for the production of domestic hot water

CONTEMPOR_CAR 60 R 0 1 // Si No No Simultaneous loads

RIT_ACC_RAS 61 R 0 60 m Si No No Delay start immersion heater

DELAY_VALV 62 R 0 120 s Si No No Valve rotation time

BANDA_SET_ACS 63 R 20 100 /10 °C Si No No DHW operating setpoint range

DELTA_SET_ACS 64 R 0 50 /10 °C Si No No DHW operating setpoint delta

TIPO_SBRINAMENTO 65 R 0 1 // Si No No Type of defrost

ABILIT_COMAN_SER 66 R 0 2 // Si No No Enabling remote control

BAUD_RATE 67 R 0 3 // Si No No Baud rate

ADDR_BMS 68 R 0 200 // Si No No Address

MODULO_1 69 R 0 1 // Si No No Presence of expansion module1





MODBUS VARIABLES FOR VMF‐MULTICHILLER CONTROLLER (UNIT and SYSTEM DATA)

ModBus Variable

Address Access type Min Value

Max Value

Unit of measurement

ModBus Control

Description 0x03 0x06 0x10

RESET_ALL_UNITA 100 W 0 1 // Si Si No Forced reset of the units present in the system

TUA_M1 101 R ‐200 700 /10 °C Si No No Leaving water temperature

TIA_M1 102 R ‐200 700 /10 °C Si No No Entering water temperature

TAE_M1 103 R ‐200 700 /10 °C Si No No External air temperature

TGP_M1 104 R ‐30 150 /10 °C Si No No Discharge gas temperature

TSB_M1 105 R ‐30 150 /10 °C Si No No Coil temperature

AP_M1 106 R 0 42 bar Si No No High Pressure

BP_M1 107 R 0 42 bar Si No No Low Pressure

PT_M1 108 R 0 100 % Si No No Thermostat demand

PO_M1 109 R 0 150 Herzt or % Si No No Inverter current frequency/power

SET_REG_IST_M1 110 R ‐200 700 /10 °C Si No No Current control setpoint

STATO_M1 111 R 0 6 // Si No No

Unit status (0:OFF, 1:STAND_BY, 2:POMPA_ON (pump on), 3:COMPRESSORE_ON, 4:SBRINAMENTO (defrost), 5: NON CONNESSO (not connected), 6: PRESENZA ALLARME (alarms present))

STAGIONE_M1 112 R 0 1 // Si No No Unit season (0:freddo (cooling), 1:caldo (heating))

ALLARME_M1 113 R 0 255 // Si No No Alarm code













































TUA_MIX 153 R ‐200 700 /10 °C Si No No Mixed leaving water temperature

TIA_MIX 154 R ‐200 700 /10 °C Si No No Mixed entering water temperature

TEMP_AE 155 R ‐200 700 /10 °C Si No No External air temperature sensor

TEMP_ACS 156 R ‐200 700 /10 °C Si No No Domestic hot water temperature

STATO_ACS 157 R 0 1 // Si No No Domestic hot water status (0: NON ATTIVO (not active), 1:ATTIVO (active))

PRESENZA_ALLARMI 158 R 0 0xFFFF // Si No No System alarms present RIASSUNTO_ALLARME 159 R 0 1 // Si No No Flag alarm summary

Remote control from MODULE ACCESSORY

If the “module accessory” remote control is enabled the system allows digital inputs and outputs to integrate with

the application.

The inputs available are:

System enabling input (On/Off)

Unit alarm reset input

Change season input

The outputs available are:

System alarm summary (units, DHW, system, expansion modules)

System status (On/Off)

System season (heating/cooling)

Alarm present in one of the unit



System setup menu: baud rate 5.1.4.1

In this screen the supervisor serial port baud rate can be set. Access level: technician.

To set the baud rate parameter:

1. Press the key

2. With the keys and select the lines 9600, 19200, 38400 bit/s



System setup menu: serial address 5.1.4.2

In this screen the supervisor serial port address can be set. Access level: technician.

To set the serial port address:

1. Press the key

2. With the keys e increase/decrease the data, range 0 to 247



System setup menu: expansion present 5.1.4.3



This screen of the SYSTEM SETUP allows selecting the setup for the VMF CRP accessories. There can be a

maximum of three of these and each has a particular function. Access level: technician.

To select the presence of expansion modules in the system:

1. Press the key ;

2. With the keys and set if the module is present ( present, not present)

3. Press the key to confirm

4. Repeat the selection until VMF CRP 3

5. Press the key to save in the eeprom.


VMF CRP1 present, shows that this accessory module is used to control:

• Up to 4 three way diverting valves for controlling the production of hot water between the system and

domestic hot water

• Sensors for the entering and leaving water (SIW and SUW)

• DHW tank water sensor ACS (SAS)

• Sensors for external air (SAE)

VMF CRP 2 present, shows that this accessory module is used to control:

• An immersion heater for the production of domestic hot water (controls enabling, starting and alarms of the

heater)

VMF CRP 3 present, shows that this accessory module is used to control MULTICONTROL through remote

control. If installed this module offers the possibility of remote control through:

• System On/Off (INPUT)

• Reset alarms (INPUT)

• Change season (INPUT)

• Alarm summary (OUTPUT)

• Current system status (On/Off) (OUTPUT)

• Current system season (OUTPUT)

• Alarms present in one unit (OUTPUT).

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