Thermocold MEX VS 15 RH Manuale utente

CONTROLLER MANUAL FOR CHILLERS AND

INVERTER AIR/WATER HEAT PUMPS WITH

AXIAL FANS

MANUALE DEL CONTROLLO

MEX VS 15 RH / MEX VS 16 RH

MEX VS 18 RH /

MEX VS 19 RH

MEX VS 112 RH

/MEX VS 112T RH

MEX VS 115 RH

/ MEX VS 115T RH

Cod.

MCO14124H7800-02

CONTROLLER MANUAL

MEX VS 15 RH / MEX VS 16 RH

MEX VS 18 RH / MEX VS 19 RH

MEX VS 112 RH /MEX VS 112T RH

MEX VS 115 RH / MEX VS 115T RH

Cod. MCO14124H7820-02

Questo manuale è stato creato per scopo informativo. La ditta declina ogni responsabilità per i risultati di una progettazione o di una installazione basata sulle spiegazioni e le specifiche

tecniche riportate in questo manuale. E’ inoltre vietata la riproduzione anche parziale sotto qualsiasi forma dei testi e delle figure contenute in questo manuale.

Manuale in lingua originale

Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans

INDEX

1CONSERVATION OF THE MANUAL.......................................................................................................................................... 3

1.1 GRAPHIC SYMBOLS................................................................................................................................................................. 3

2PERMITTED USES ................................................................................................................................................................... 3

3GENERAL SAFETY RULES......................................................................................................................................................... 3

3.1 PERSONAL SAFETY EQUIPMENTS ........................................................................................................................................... 3

3.2 WORKERS’ HEALTH AND SAFETY ............................................................................................................................................ 3

4PURPOSES AND CONTENTS OF THE MANUAL......................................................................................................................... 5

5USER’S INTERFACE - CONTROLER ........................................................................................................................................... 5

5.1 MENU STRUCTURE DIAGRAM ................................................................................................................................................ 5

5.2 ANALOG INPUT MENU............................................................................................................................................................ 6

5.3 PARAMETERS CATEGORIES .................................................................................................................................................... 6

5.4 SETPOINT ADJUSTABLE BY THE USER...................................................................................................................................... 6

5.5 DISPLAY .................................................................................................................................................................................. 7

5.6 LED ......................................................................................................................................................................................... 7

5.7 INPUT/OUTPUT (I/O) PORTS................................................................................................................................................... 7

6DYNAMIC SET-POINT ADJUSTMENT ....................................................................................................................................... 8

7SET-POINT ADJUSTMENT FROM 0-10V INPUT ........................................................................................................................ 8

8CIRCULATOR .......................................................................................................................................................................... 9

8.1 OPERATION BY MEAN OF THERMOREGULATOR (DEFAULT) ..................................................................................................... 9

8.2 OPERATION BY THERMOREGULATOR WITH PERIODIC ACTIVATION .................................................................................... 10

8.3 OPERATION WITH ACTIVE ELECTRIC HEATER ....................................................................................................................... 10

8.4 CONTINUOUS OPERATION ................................................................................................................................................... 10

8.5 PROPORTIONAL ADJUSTMENT OF THE PUMP ...................................................................................................................... 10

8.6 PURGING THE SYSTEM.......................................................................................................................................................... 11

9HEAT DISSIPATION FAN MOTOR CONTROL .......................................................................................................................... 11

9.1 FAN SPEED CONTROL IN COOLING MODE ............................................................................................................................ 11

9.2 FAN SPEED CONTROL IN HEATING MODE............................................................................................................................. 12

10 CONTROL FUNCTIONS ...................................................................................................................................................... 12

10.1 ALARM WARNING ................................................................................................................................................................ 12

10.2 ANTIFREEZE PROTECTION ELECTRIC HEATERS (WHEN THE KA ACCESSORY IS PRESENT)...................................................... 12

10.3 ACTIVATION OF SANITARY (DOMESTIC) HOT WATER PRODUCTION .................................................................................... 12

10.3.1 SENSOR MEMORIZATION IN HEATING MODE .............................................................................................................. 13

10.4 HEATING MODE ON SANITARY ACCUMULATION ................................................................................................................. 14

10.5 REMOTE FUNCTIONS............................................................................................................................................................ 15

10.5.1 ON/OFF......................................................................................................................................................................... 15

10.5.2 SUMMER/WINTER MODE COMMUTATION ................................................................................................................. 15

10.5.3 SANITARY MODE CALL FROM DIGITAL INPUT .............................................................................................................. 15

10.6 REMOTE SENSOR FOR THE WATER TEMPERATURE OF THE PLANT CIRCUIT......................................................................... 16

10.7 AUXILIARY ELECTRIC HEATER................................................................................................................................................ 16

10.7.1 PLANT CIRCUIT ELECTRIC HEATER ................................................................................................................................ 16

10.7.2 AUXILIARY ELECTRIC HEATER OF THE PLANT IN DEFROST CYCLE ................................................................................. 16

10.7.3 ELECTRIC HEATER OF SANITARY WATER PRODUCTION ............................................................................................... 17

10.7.4 A UNIQUE AUXILIARY ELECTRIC HEATER FOR BOTH PLANT SYSTEM/DHW PRODUCTION........................................... 17

10.8 SELECTION MODE OF AUXILIRY ELECTRIC HEATERS ............................................................................................................. 17

10.9 MANAGEMENT OF THE CIRCULATOR WITH ACTIVE ELECTRIC HEATER ................................................................................ 17

10.10 BOILER ENABLEMENT........................................................................................................................................................... 17

10.11 ACTIVATION OF AUXILIARY ELECTRIC HEATERS AND BOILER DURING THE JOINT AND IN SUBSTITUTION OPERATION TO THE

COMPRESSOR OF THE HEAT PUMP .................................................................................................................................................. 18

10.11.1 OPERATION IN HEAT PUMP MODE .......................................................................................................................... 18

10.11.2 IN JOINT OPERATION (AREA I) .................................................................................................................................. 18

10.11.3 IN JOINT OPERATION (AREA II) ................................................................................................................................. 18

10.11.4 IN SUBSTITUTION OPERATION ................................................................................................................................. 19

Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans

10.12 OPERATION AREA -ACTIVATION OF THE AUXILIARY ELECTRIC HEATER AND BOILER (PLANT CIRCUIT WATER TEMPERATURE SENSOR

IS NOT ENABLED)................................................................................................................................................................................... 19

10.12.1 AUXILIARY SYSTEMS OFFSET MANAGEMENT........................................................................................................... 22

10.13 SUMMER/WINTER OPERATION INDICATION ....................................................................................................................... 23

10.14 DEFROSTING CYCLE .............................................................................................................................................................. 23

10.15 COMPRESSOR CRANCKASE HEATER ..................................................................................................................................... 23

10.16 MANAGEMENT OF THE SECONDARY CIRCULATOR/RELAUNCHING PUMP (WITH ROOM THERMOSTAT) .................................... 23

10.17 MAXIMUM HZ.......................................................................................................................................................................... 24

10.18 DOUBLE SET-POINT (WITHOUT REMOTE CONTROL HI-T) .............................................................................................................. 24

10.18.1 CONTROL SETTINGS.................................................................................................................................................. 24

10.18.2 NOTES FOR INSTALLATION ....................................................................................................................................... 24

10.18.3 HUMIDISTAT OPERATION ......................................................................................................................................... 25

10.18.4 ADJUASTABLE SET-POINT ......................................................................................................................................... 25

10.18.5 COMMUTATION ....................................................................................................................................................... 25

10.18.6 HUMIDISTAT WIRING ............................................................................................................................................... 26

11 AVAILABLE FUNCTIONS WITH HI-T ACCESSORY ................................................................................................................ 26

12 AVAILABLE FUNCTIONS WITH KIE MODULE (OPTIONAL) .................................................................................................. 26

13 HANDBOOK FOR CONFIGURATIONS OF INSTALLATION.................................................................................................... 26

14 TABLES OF CONFIGURATIONS ALLOWED TO USER AND INSTALLER.................................................................................. 26

15 ALARMS ........................................................................................................................................................................... 32

15.1 WATER FLOW SWITCH ALARM E06....................................................................................................................................... 32

15.2 HIGH TEMPERATURE E18 ..................................................................................................................................................... 32

15.3 ANTI-FREEZING E05 .............................................................................................................................................................. 32

15.4 SENSORS ALARM E611÷E691................................................................................................................................................ 32

15.5 TIMEOUT INVERTER E801..................................................................................................................................................... 32

15.6 INVERTER [E851÷E971]......................................................................................................................................................... 32

15.7 REMOTE ON/OFF E00 ........................................................................................................................................................... 32

15.8 HIGH PRESSURE E01 ............................................................................................................................................................. 32

15.9 HIGH PRESSURE FLOW SWITCH (IN SERIES WITH THE COMPRESSOR OUTLET PROBE) E641 ................................................ 32

15.10 LOW PRESSURE E02.............................................................................................................................................................. 32

15.11 [E08] DRIVER LIMITATION .................................................................................................................................................... 32

15.12 [E41] 4-WAY VALVE .............................................................................................................................................................. 33

15.13 [E42] DOMESTIC HOT WATER PROTECTION ......................................................................................................................... 33

15.14 POWER FAILURE ................................................................................................................................................................... 33

15.15 USER BLOCK ALARM LIST ...................................................................................................................................................... 33

Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans

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 also available and accessible to all users who shall consult it any time they are in doubt on how to operate the equipment.

The company reserves the right to modify its products and related manuals without necessarily updating previous versions of the

reference material. It declines also any responsibility for possible inaccuracies in the manual if due to printing or transcription

errors.

The customer shall store any updated copy of the manual or parts of it delivered by the manufacturer as an attachment to this

manual.

The company is available to give any detailed information about this manual and to give information regarding the use and the

maintenance of its own units.

1.1 GRAPHIC SYMBOLS

Indicates prohibited operations.

Indicates operations that can be dangerous for people and/or disrupts the correct operation of the equipment.

Electric shock hazard - risk of electric shock.

Indicates important information that the operator has to follow in order to guarantee the correct operation of the

equipment in complete safety. It indicates also general notes.

2PERMITTED USES

The company excludes any contractual and extra contractual liabilities for damages caused to persons, animals or objects, by

incorrect installation, setting and maintenance, improper use of the equipment, and the partial or superficial reading of the

information contained in this manual.

These units have been designed only for heating and/or cooling water. Any other use not expressly authorized by the

manufacturer is considered improper and therefore not allowed.

The location of the plant, the hydraulic and electrical circuits must be established by the planting designer and must take into

account both technical requirements as well as any applicable local laws and authorized specifications.

The execution of all works must be performed by skilled and qualified personnel, competent in the existing rules in different

countries.

3GENERAL SAFETY RULES

Before beginning to operate on the units every user has to be perfectly knowledgeable about the functions of the equipment and

its controls and has to have read and understood the information listed in the user’s-installer’s manual.

3.1 PERSONAL SAFETY EQUIPMENTS

During the operating and maintaining works, use the following personal protective equipment.

Protective clothing: Maintenance men and operators have to wear protective clothing that complies with the basic

safety requirements currently in force. In case of slippery floors, users have to wear safety shoes with non-slip soles.

Gloves: During maintenance or cleaning operation protection gloves have to be used

Mask and goggles: Respiratory protection (mask) and eye protection (goggles) should be used during

cleaning and maintenance operations.

3.2 WORKERS’ HEALTH AND SAFETY

The European Community has adopted a number of directives on workplace’s health and safety, which include 89/391/CEE,

89/686/CEE, 2009/104/CE, 86/188/CEE and 77/576/CEE directives. Every employer shall implement such provisions and ensure

that their workers to respect them.

It’s forbidden:

To remove and/or tamper with any safety device.

The access to the electrical board by unauthorized persons

To carry out any work on the equipment under voltage

To touch the equipment if you are not allowed.

The use of the appliance by children or unassisted disabled persons.

To touch the appliance when barefoot or parts of the body are wet or damp

To clean the unit when the power is ‘ON’.

To pull, remove or twist the electrical cables coming out from the unit.

Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans

To step with your feet on the appliance, sit down and/or place any type of object.

To spray or pour water directly on the unit.

To dispose of, abandon or leave within reach of children packaging materials (cardboard, staples, plastic bags, etc.) as they

may represent an environmental and health hazards.

To tamper with or replace parts of the equipment without the specific consent of the manufacturer. The manufacturer shall

have no whatsoever civilian or penal responsibility in case of unauthorized operations.

WARNING:

Before proceeding, you should read the user’s-installer manual accompanying appliance.

All the operations described below must be carried out only by QUALIFIED PERSONNEL.

The wiring to the terminal block must be performed by qualified personnel.

Any routine and/or not-routine maintenance operation shall be carried out when the equipment has been shut down,

disconnected from electric power supply.

Do not put neither your hands nor insert screwdrivers, spanners or other tools into moving parts of the equipment

The equipment’s supervisor and the service man have to receive suitable training for performing their tasks in safety.

The access to the electric panel is limited to authorized personnel only.

Operators have to know how to use personal protective devices and have to know the accident-prevention guidelines

contained in national and international laws and norms.

The operator’s workplace has to be kept clean, tidy and free from objects that may prevent free movements. Appropriate

lighting of the work place shall be provided so as to allow the operator to carry out the required operations safely. Poor or too

strong lighting can cause risks.

Ensure that the work places are always adequately ventilated and that aspirators are working, in good condition and in

compliance with the requirements of the laws in force.

Not all the configurations can be simultaneously enabled and/or changed.

Other values different than those of default can ensure the proper operation of the unit, in case of doubt about the value to be

set contact please our office.

The company excludes any contractual and extra contractual liabilities for damages caused to persons, animals or objects, by

incorrect installation, setting and maintenance, improper use of the equipment, and the partial or superficial reading of the

information contained in this guide.

The supply voltage’s fluctuations cannot exceed ±10% of the nominal value. If this tolerance should not be respected, please

contact our technical department.

The power supply should respect the listed limits: failing this, warranty will not be valid immediately. Before any operation on

the unit, be sure that the power supply is disconnected.

Phase, neutral and ground connections should be respected.

The power supply cables must be sized correctly. We recommend a minimum cross section of 4mm2and a maximum length of

10m.

Install upstream of each unit an adequate protection and disconnection device of the electric power with delayed

characteristic curve, with at least 3 mm contact opening and with an adequate capacity of breaking and differential protection.

The capacity of the magneto-thermic circuit breaker must conform to the electric consumption of the unit; see TECHNICAL DATA

reported in the user’s-installer’s manual accompanying the unit. (Consideration should be taken of any eventual auxiliary

electric heater).

A good grounding is required; the manufacturer is not responsible for damage caused in case of lack of good grounding.

In case of maintenance, the unit must be disconnected from the power supply, the power cable plug must be easy for pulling it

out from the power socket by the operator for having possibility to check the unit from anywhere, the plug should remain

disconnected.

Use cables that meet the regulations in force in different countries.

Be sure, after about 10 minutes of operation the screws on the power supply terminal block that are well fixed.

Requirements before performing electrical work on the control panel:

Turn off the unit from the control panel ("OFF" displayed).

Put the switch “QF” general differential on OFF position

wait for 15 seconds before getting access to the electric board

Check the ground connection before beginning any operation.

Be sure that you are well insulated from the ground, with dry hands and feet, or by using insulating platforms and gloves.

Check that there is no foreign material near the system.

Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans

4PURPOSES AND CONTENTS OF THE MANUAL

This manual provides basic information for the installation, operation and maintenance of MEX VS units.

It is addressed to machine operators and it enables them to use the equipment efficiently, even if they do not have any previous

specific knowledge of it.

Not all the described functions can be individually and/or simultaneously selected. Please contact the technical office for any

information.

The manual describes the characteristics of the equipment at the time in which it is being put on the market; therefore, it may not

include technological improvements introduced later by the company as part of its constant endeavour to enhance the

performance, ergonomics, safety and functionality of its products.

The company introduces also technological improvements and is not constrained to update the manuals for previous versions of

appliances that could not be compatible. So make sure to use manual supplied with the installed appliance.

It’s recommended that, the user must follow the instructions contained in this booklet, especially those concerning the safety and

routine maintenance.

5USER’S INTERFACE - CONTROLER

It is used to select the operating mode, and to reset the manual resetting alarms. The operating

mode changes as per the sequence below each time you press the Mode button:

off cool heat off

If the Domestic Hot Water (DHW) mode is enabled, the sequence is as follows:

off cool cool+sanheat heat+sanoff

During the parameters’ setting, this button can be used to revert BACK to the previous level.

It allows you to enter into the setting menu parameters and to select the cool/summer,

heat/winter and DHW set point value.

UP button: In the setting mode, this button allows you to move up to a higher menu or to increase

the value of a parameter when you are in the “edit” mode.

DOWN button: In the setting mode, this button allows you to shift to a lower menu or to decrease

the value of a parameter when you are in the “edit” mode.

5.1 MENU STRUCTURE DIAGRAM

Level 0 (U) = always appearing

Level 1 (M) = it appears if you enter the maintainer (H80) or manufacturer password.

Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans

Level 2 (C) = it appears if you enter the manufacturer password.

Level 3 (A) = it appears only via Modbus.

5.2 ANALOG INPUT MENU

By entering the maintainer password in the menu of analog inputs "tP", at the level 1 of the menu structure diagram of the unit

control board, you can read the values of the current probes:

DESCRIPTION

Measurement unit

t01

Inlet water temperature

(°C)

t02

Outlet water temperature

(°C)

t03

Compressor inlet temperature

(°C)

t04

Compressor outlet temperature

(°C)

t05

High pressure

(bar)

t06

Low pressure

(bar)

t07

Outdoor air temperature

(°C)

t08

Plant remote temperature senor (if enabled)

(°C)

t09

Domestic hot water temperature (if DHW is enabled)

(°C)

t10÷t27

Parameters presents if installed the optional KIE module

5.3 PARAMETERS CATEGORIES

The parameters are classified into groups, each group is identified by a 3-digit code, while the index of each parameter is preceded

by one letter.

DESCRIPTION

GROUP IDENTIFICATION CODE

PARAMETER INDEX

VISIBILITY

Configuration

CnF

H-

USER / INSTALLER

Compressor

C-

INSTALLER

Fan

FAn

F-

INSTALLER

Alarms

ALL

A-

INSTALLER

Regulation

INSTALLER

Pump

PUP

P-

INSTALLER

Electric heater

Fro

INSTALLER

Defrost

dFr

INSTALLER

Electronic valve

EEu

U-

INSTALLER

Offset

OFF

INSTALLER

Mixer valve

rAd

INSTALLER

**Solar

SUn

S-

INSTALLER

Inverter

compressors

nCP

INSTALLER

Hz massimi

LbH

L-

UTENTE/INSTALLATORE

* DHW preparer

AcS

Ac-

USER / INSTALLER

(*) Programmable parameters if the optional KIE module is present

5.4 SETPOINT ADJUSTABLE BY THE USER

SETPOINT

DESCRIZIONE

UNITA’

DEFAULT

RANGE

Coo

setpoint in Estate

°C

7.0

5÷18

Hea

setpoint in Inverno

°C

45.0

35÷57

*San

DHW mode setpoint

°C

48.0

25÷57

Co2

Secondo setpoint in Estate

°C

18.0

Coo÷23

He2

Secondo setpoint in Inverno

°C

35.0

25÷Hea

**rCO

Mixer valve setpoint in Summer mode

°C

15.0

-50.0÷80.0

**rHE

Mixer valve setpoint in Winter mode

°C

30.0

-50.0÷80.0

**ACS

DHW instantaneous production setpoint

°C

45.0

0.0÷80.0

(*)

Adjustable Setpoint if the DHW mode is active

(**)

Adjustable Setpoint if is intalled the optional KIE module

Setpoint type

Setpoint (summer/winter)

Summer default (range)

Winter default (range)

First setpoint (°C)

Coo/Hea

7 (5÷18)

45 (35÷55)

Second setpoint (°C)

Co2/He2

18 (7÷23)

35 (25÷45)

Sanitary Setpoint (°C)

San

48 (25÷55)

The functionality of the second setpoint can be used only when you purchase the proper optional kit.

Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans

5.5 DISPLAY

In Normal view displays the outlet water temperature reported to tenths of degrees, or the alarm code if at least an alarm is

active. In case of multiple alarms activation, it will display the first alarm, while the second appears when the first is reset. Into the

menu mode, the display depends on the current position where you are.

5.6 LED

Compressor LED

ON if the compressor is running

OFF if the compressor is off

FLASHING if timings are in progress waiting for compressor’s start up

Sanitary water LED

ON if sanitary mode is active

OFF if the sanitary mode is not active

FLASHING if sanitary production in progress (sanitary valve is active)

Defrosting LED

ON in defrost operating mode

OFF if defrosting mode is disabled or completed

FLASHING if defrosting cycle interval’s time is in progress.

Antifreeze electric heater LED

The LED is ON if the antifreeze electric heater is active.

Water pump LED

The LED is ON if the water pump is running.

Alarm LED

The LED is ON if an alarm is activated.

Heat LED

The LED is ON if the unit is in the heating mode operation.

Cool LED

LED is ON if the unit is in the cooling mode operation.

5.7 INPUT/OUTPUT (I/O) PORTS

The I/O (inputs and outputs) that can be set to enable the control functions are listed below.

In order to set the I/O please enter with service password to the parameters PRGPSSPRG (insert the service password) 

PRG Par PRG CnF.

Ports

Parameter

Terminals

Factory Setting

Description

Value

Function

ST8

H19

SE/SE

Not set

Programmable analog input with NTC sensor

10kΏ at 25°C β 3435

ST9

H20

SAN/SAN

Not set

Programmable analog input with NTC sensor

10kΏ at 25°C β 3435

ID2

H39

ONOFF/ONOFF

Remote on/off

(See paragraph 10.5.1)

Voltage free contact digital input

ID3

H40

SW/SW

Remote summer/winter

commutation

(See paragraph 10.5.2)

Voltage free contact digital input

To activate this function see paragraph 10.5.2

ID7

H44

SE/SE

Not set

Voltage free contact digital input, programmable

instead of the analog input ST8 (H19=0)

ID8

H45

SAN/SAN

Not set

Voltage free contact digital input, programmable

instead of the analog input ST9 (H20=0)

DO3

H58

AEH (phase)

AEHN (neutral)

Command of the plant

auxiliary E-heater

(See paragraph 10.7.1)

Under voltage output single phase 230Vac, 50Hz,

5A resistive, 1A inductive.

To activate this function see paragraph 10.7.1

DO4

*H59

DO4 (phase)

DO4N (neutral)

Not set

Under voltage output single phase 230Vac, 50Hz,

5A resistive, 1A inductive.

DO5

*H60

DO5 (phase)

DO5N (neutral)

Not set

Under voltage output 230V ac, 50Hz, 5A

resistive, 1A inductive.

OC1

H61

NO1 (phase)

N1 (neutral)

NC1 (phase)

Command of DHW valve

(See paragraph 10.3)

Switching contact, single phase voltage 230Vac,

50Hz, 5A resistive, 1A inductive.

NO1= Normally open

NC1= Normally-Closed

To activate this function see paragraph 10.3

OC2

H62

NO2 (phase)

N2 (neutral)

NC2 (phase)

Command of Double

setpoint valve

(See paragraph 10.17)

Switching contact, single phase voltage 230 ac,

50Hz, 5A resistive, 1 A inductive.

NO2= Normally open

NC2= Normally-Closed

To activate this function see paragraph 10.17

(*) Do not change if the KA kit is installed is present

Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans

Note: Note that with the adoption of the optional “KIE”module helps to increase the input/output (I/O) ports. For more

information, please refer to the related manual of this module.

6DYNAMIC SET-POINT ADJUSTMENT

The controller can change the set-point by adding a value depending on the outdoor air temperature sensor. In this case, you need

to change the values of the parameters from b08 to b14 following the indications below (the settings should be done by the

installer):

Parameters of the controller PAr->rE->

• b08 = dynamic set-point, enabled = 1/ unabled = 0.

•b09 = offset max in cooling mode operation.

• b10 = offset max in heating mode operation.

• b11 = Outdoor temperature setting in cooling mode.

• b12 = Outdoor temperature setting in heating mode.

• b13 = Temperature difference in cooling mode operation.

• b14 = Temperature difference in heating mode operation.

Curve of the set-point variation as a function of the outside temperature:

7SET-POINT ADJUSTMENT FROM 0-10V INPUT

Another type of setting that allows to change the set-point by adding (or subtracting) a value in function of the 0-10V analogue

input (if enabled). To enable the function, you must set the H21 parameter to be 40, and change the values of the parameter

b15 (range 0-10), taking into account that if b20=0 input of 0-10V, if b20=1 ratiometric input type:

-b20=0 if this input is at 0 volts you will have the actual set point: set point (Coo/Hea) - b15/2.

-b20=0 if the input is at 5 volts the set point will be the set of (Coo/Hea) mode.

-b20=0 if the input is 10 volts you will have the actual set point: set point (Coo/Hea) + b15/2.

Cooling

Heating

Controller for MEX VS Chillers and inverter air / water heat pumps with axial fans

-- b20=0 when the input is at 0%, the actual set point is: set point (Coo/Hea) - b15/2.

-- b20=0 when the input is at 50%, the set point will be the set of (Coo/Hea) mode.

-- b20=0 if the input is 100%, the actual set point is: set point (Coo/Hea) + b15/2.

The signal must be applied to the terminals 0-10V+ and 0-10V- (see the wiring diagrams).

Note: In "cooling" mode, considering that the set-point by default is set to be 7°C, the parameter (b15) should not assume any

value greater than or equal to 6 in order to prevent that the new set-point set from 0-10V input to take values below the threshold

of the antifreeze operation which is 4°C.

8CIRCULATOR

The circulating pump can be set according respecting the following operating modes:

-Thermoregulatory operation (default)

-Thermoregulatory operation with periodic activation

-Continuous operation

The circulator will switch off immediately if:

Presence of blocking pump alarm including the manual reset alarm of the flow switch;

The unit is off or in stand-by mode or when it’s switched off from remote input, the circulating pump (if is ON) will always

turn off after P02 (tenths of a minute):

The circulator is always running if the antifreeze heaters are activated.

The circulator can be configured with the parameter P03 in order to operate independently than the compressor or under call.

0=Continues operation

1=Operation under thermoregulatory call

Note: If the automatic reset alarm of the flow switch is active, the pump is anyway in operation even if the compressor is off.

Contrarily, the circulator remains always in operation if the antifreeze heaters are on or when the hydraulic pump operates in

antifreeze mode. The operation in antifreeze mode will start if the water setting temperature decreases below P04 °C (default

value 5°C), and it will be disabled if the water setting temperature increases above P04+P05 °C (the default value of P05 is 2,0°C).

The adjustment of the circulator is linear (see Paragraph 8.5).

8.1 OPERATION BY MEAN OF THERMOREGULATOR (Default)

During this operating mode (P03=1, default), the thermoregulator actuates the pump; after a time delay of P01 seconds from

startup of the pump, the compressor also will turn on. However, during the power off status, the pump turns off with a delay time

of P02 minutes after turning off status with thermoregulator call (the turning off status is corresponding to the off status of the

compressor).

In the case of activation of the flow switch alarms with automatic reset, the pump remains still in operation even if the compressor

is stopped.

If you enable the operation of the unit from the remote "on-off" digital input (see Paragraph 10.5.1) the circulating pump will be

activated immediately for a duration of 2 minutes regardless of the on-board controller thermoregulation of the unit (the

activation of water recirculation in the plant leads to a correct activation of the thermoregulation).

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