Hitecsa EWFAIB Installation, Operation And Maintenance Instructions

INSTALLATION, OPERATION AND

MAINTENANCE INSTRUCTIONS

AIR COOLED WATER CHILLERS
AND HEAT PUMPS

EWFAIB 20.1, 25.1, 30.1

12.13 Ref. 207384 rev.100

7,05 kW - 34,1kW

1

English

Table of Contents

1 - FOREWORD

1.1 Introduction .......................................................................... 2

1.2 Warranty ..............................................................................2

1.3 Emergency stop / Normal stop .............................................2

1.4 An introduction to this manual ..............................................2

2 - SAFETY

2.1 Foreword ..............................................................................3

2.2 Definitions ............................................................................4

2.3 Access to the unit ...............................................................4

2.4 General precautions..............................................................4

2.5 Precautions against residual risks .........................................4

2.6 Precautions during maintenance operations ..........................5

2.7 Safety labels ................................................................. 6 & 7

2.8 Safety regulations ........................................................ 8 to 10

3 - TRANSPORT, HANDLING AND STORAGE

3.1 Inspection ..........................................................................11

3.2 Handling ............................................................................11

3.3 Anchoring ..........................................................................12

3.4 Storage ..............................................................................12

4 - INSTALLATION

4.1 Installation site ................................................................... 13

4.2 External water circuit ................................................. 13 to 15

4.3 Water connections .............................................................15

4.4 Defrost water drainage .......................................................15

4.5 Water buffer tank ...................................................... 15 & 16

4.6 Power supply ............................................................ 16 & 17

4.7 Electrical connections................................................ 18 & 19

5 - START-UP

5.1 Preliminary checks .............................................................20

5.2 Start-up .............................................................................20

5.3 Checking the operation .......................................................20

5.4 Delivery to the customer ............................................ 20 & 21

6 - EWFAIB CONTROL

6.1 Control of EWFAIB units, single compressor,

variable speed ....................................................................21

6.2 Keypad functions ...................................................... 21 & 22

6.3 Alarms ...............................................................................22

6.4 Menus ......................................................................22 to 27

6.5 Starting the appliance ................................................ 27 to 29

6.6 Parameters list .......................................................... 30 & 31

6.7 Alarm list ...........................................................................32

7 - PRODUCT DESCRIPTION

7.1 General information ............................................................33

7.2 Accessories .......................................................................35

7.3 Refrigeration circuits ..........................................................36

8 - TECHNICAL DATA

8.1 Hydraulic features ..............................................................37

8.2 Physical data......................................................................38

8.3 Electrical data .....................................................................39

8.4 Dimensional Drawings ........................................................40

8.5 Space requirements ...........................................................41

9 - MAINTENANCE

9.1 General requirements ....................................................... 42

9.2 Planned maintenance ........................................................42

9.3 Refrigerant charge .............................................................43

9.4 Compressor ......................................................................43

9.5 Condenser ....................................................................... 43

9.6 Fans .................................................................................43

9.7 Dehydrating filter ...............................................................43

9.8 Sight glass ........................................................................44

9.9 Thermostatic expansion valve............................................44

9.10 Evaporator ........................................................................44

10 - TROUBLESHOOTING .......................................... 45

11 - SPARE PARTS

11.1 Spare part list.....................................................................46

11.2 Oil for compressors ............................................................46

11.3 Wiring diagrams .................................................................46

12 - DISMANTLING, DEMOLITION AND SCRAPPING

12.1 Generalities ........................................................................47

2

1 - Foreword

1.1 Introduction

Units, manufactured to state-of-the-art design and implementation
standards, ensure top performance, reliability and fitness to any type
of air-conditioning systems.

These units are designed for cooling water or glycoled water (and for
water heating in heat pump models) and are unfit for any purposes
other than those specified in this manual.

This manual includes all the information required for a proper
installation of the units, as well as the relevant operating and
maintenance instructions.

It is therefore recommended to read this manual carefully before
installation or any operation on the machine. The chiller installation
and maintenance must be carried out by skilled personnel only
(where possible, by one of Authorised Service Centers).

The manufacturer may not be held liable for any damage to people or
property caused by improper installation, start-up and/or improper
use of the unit and/or failure to implement the procedures and
instructions included in this manual.

1.2 Warranty

These units are delivered complete, tested and ready for being
operated. Any form of warranty will become null and void in the event
that the appliance is modified without manufacturer’s preliminary
written authorisation.

This warranty shall apply providing that the installation instructions
have been complied with (either issued by manufacturer, or deriving
from the current practice), and the Form 1 (“Start-up”) has been
filled-in and mailed to manufacturer (attn. After-Sales Service).

In order for this warranty to be valid, the following conditions shall
be met:

Q The machine must be operated only by skilled personnel from

Authorised After-Sales Service.

Q Maintenance must be performed only by skilled personnel - from

one of Authorised After-Sales Centers.

Q Use only original spare parts.
Q Carry out all the planned maintenance provided for by this manual

in a timely and proper way.

Failure to comply with any of these conditions will automatically void
the warranty.

1.3 Emergency stop / Normal stop

The emergency stop of the unit can be enabled using the master
switch on the control panel (move down the lever).

For a normal stop, press the relevant push-buttons.
To restart the appliance, follow the procedure detailed in this manual.

1.4 An introduction to the manual

For safety reasons, it is imperative to follow the instructions given
in this manual. In case of any damage caused by non-compliance
with these instructions, the warranty will immediately become null
and void.

Conventions used throughout the manual:

DANGER

The DANGER sign recalls your attention to
a certain procedure or practice which, if not
followed, may result in serious damage to
people and property.

WARNING

The WARNING sign precedes those procedures
that, if not followed, may result in serious
damage to the appliance.

NOTE

The NOTE contain important observations.

USEFUL TIPS

The USEFUL TIPS provide valuable information
that optimises the efficiency of the appliance.

This manual and its contents, as well as the documentation which
accompanies the unit, are and remain the property of manufacturer,
which reserves any and all rights thereon. This manual may not
be copied, in whole or in part, without manufacturer’s written
authorization.

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English

2 - Safety

2.1 Foreword

These units must be installed in conformity with the
provisions of Machinery Directive 2006/42/EC, Low Voltage
Directive 2006/95/EC, Pressure Vessels Directive 97/23/
EC, Electromagnetic Interference Directive 2004/108/EC,
as well as with other regulations applicable in the country
of installation. If these provisions are not complied with, the
unit must not be operated.

DANGER

The unit must be grounded, and no
installation and/or maintenance operations
may be carried out before deenergising the
electrical panel of the unit.

Failure to respect the safety measures mentioned above may result
in electrocution hazard and fire in the presence of any short-circuits.

DANGER

Inside the heat exchangers, the compressors
and the refrigeration lines, this unit contains
liq uid and ga seo us refrigerant under
pressure. The release of this refrigerant may
be dangerous and cause injuries.

DANGER

The units are not designed to be operated with
natural refrigerants, such as hydrocarbons.
Manufacturer may not be held liable for any
problems deriving from the replacement
of original refrigerant or the introduction of
hydrocarbons.

Units are designed and manufactured according to the requirements
of European Standard PED 97/23/EC (pressure vessels).

Q The used refrigerants are included in group II (non-hazardous

fluids).

Q The maximum working pressure values are mentioned on the

unit’s data plate.

Q Suitable safety devices (pressure switches and safety valves)

have been provided, to prevent any anomalous overpressure
inside the plant.

Q The vents of the safety valves are positioned and oriented in such

a way as to reduce the risk of contact with the operator, in the
event that the valve is operated. Anyway, the installer will convey
the discharge of the valves far from the unit.

Q Dedicated guards (removable panels with tools) and danger signs

indicate the presence of hot pipes or components (high surface
temperature).

DANGER

The guards of the fans (only for units provided
with air heat exchangers) must be always
mounted and must never be removed before
de-energising the appliance.

DANGER

It is the User’s responsibility to ensure that
the unit is fit for the conditions of intended use
and that both installation and maintenance are
carried out by experienced personnel, capable
of resp ectin g all the recomme ndati ons
provided by this manual.

It is important that the unit is adequately
supported, as detailed in this manual. Non­compliance with these recommendations may
create hazardous situations for the personnel.

DANGER

The unit must rest on a base which meets the
characteristics specified in this manual; a
base with inadequate characteristics is likely
to become a source of serious injury to the
personnel.

WARNING

The unit has not been design to withstand
loads and/or stress that may be transmitted by
adjacent units, piping and/or structures.

Each external load or stress transmitted to the
unit may break or cause breakdowns in the
unit’s structure, as well as serious dangers to
people. In these cases, any form of warranty will
automatically become null and void.

WARNING

The packaging material must not be disposed of
in the surrounding environment or burnt.

4

2 - Safety

2.2 Definitions

OWNER: means the legal representative of the company, body or

individual who owns the plant where unit has been installed; he/she
has the responsibility of making sure that all the safety regulations
specified in this manual are complied with, along with the national
laws in force.

INSTALLER: means the legal representative of the company who has
been given by the owner the job of positioning and performing the
hydraulic, electric and other connections of unit to the plant: he/she is
responsible for handling and properly installing the appliance, as specified
in this manual and according to the national regulations in force.

OPERATOR: means a person authorised by the owner to do on unit
all the regulation and control operations expressly described in this
manual, that must be strictly complied with, without exceeding the
scope of the tasks entrusted to him.

ENGINEER: means a person authorised directly by manufacturer or,
in all EC countries, excluding Italy, under his full responsibility, by
the distributor of product, to perform any routine and extraordinary
maintenance operations, as well as any regulation, control, servicing
operations and the replacement of pieces, as may be necessary
during the life of the unit.

2.3 Access to the unit

The unit must be placed in an area which can be accessed also
by OPERATORS and ENGINEERS; otherwise the unit must be
surrounded by a fence at not less than 2 meters from the external
surface of the machine.

OPERATORS and ENGINEERS must enter the fenced area only
after wearing suitable clothing (safety shoes, gloves, helmet etc.).
The INSTALLER personnel or any other visitor must always be
accompanied by an OPERATOR.

For no reason shall any unauthorised personnel be left alone in
contact with the unit.

2.4 General precautions

The OPERATOR must simply use the controls of the unit; he must not
open any panel, other than the one providing access to the control
module.

The INSTALLER must simply work on the connections between plant
and machine; he must not open any panels of the machine and he
must not enable any control.

When you approach or work on the unit, follow the precautions listed
below:

Q Do not wear loose clothing or jewellery or any other accessory tat

may be caught in moving parts.

Q Wear suitable personal protective equipment (gloves, goggles

etc.) when you have to work in the presence of free flames
(welding operations) or with compressed air.

Q If the unit is placed in a closed room, wear ear protection devices.
Q Cut off connecting pipes, drain them in order to balance the

pressure to the atmospheric value before disconnecting them,
disassemble connections, filters, joints or other line items.

Q Do not use your hands to check for any pressure drops.

Q Use tools in a good state of repair; be sure to have understood the

instructions before using them.

Q Be sure to have removed all tools, electrical cables and any other

objects before closing and starting the unit again.

2.5 Precautions against residual risks

Prevention of residual risks caused by the control
system

Q Be sure to have perfectly understood the operating instructions

before carrying out any operation on the control panel.

Q When you have to work on the control panel, keep always the

operating instructions within reach.

Q Start the unit only after you have checked its perfect connection

to the plant.

Q Promptly inform the ENGINEER about any alarm involving the

unit.

Q Do not reset manual restoration alarms unless you have identified

and removed their cause.

Prevention of residual mechanical risks

Q Install the unit according to the instructions provided in this

manual.

Q Carry out all the periodical maintenance operations prescribed by

this manual.

Q Wear a protective helmet before accessing the interior of the unit.

Q Before opening any panelling of the machine, make sure that it is

secured to it by hinges.

Q Do not touch air condensation coils without wearing protective

gloves.

Q Do not remove the guards from moving elements while the unit is

running.

Q Check the correct position of the moving elements’ guards before

restarting the unit.

Prevention of residual electrical risks

Q Connect the unit to the mains according to the instructions

provided in this manual.

Q Periodically carry out all the maintenance operations specified by

this manual.

Q Disconnect the unit from the mains by the external disconnecting

switch before opening the electrical board.

Q Check the proper grounding of the unit before start-up.

Q Check all the electrical connections, the connecting cables, and in

particular the insulation; replace worn or damaged cables.

5

English

2 - Safety

Q Periodically check the board’s internal wiring.
Q Do not use cables having an inadequate section or flying

connections, even for limited periods of time or in an emergency.

Prevention of other residual risks

Q Make sure that the connections to the unit conform to the

instructions provided in this manual and on the unit’s panelling.

Q If you have to disassemble a piece, make sure that it has been

properly mounted again before restarting the unit.

Q Do not touch the delivery pipes from the compressor, the

compressor and any other piping or component inside the
machine before wearing protective gloves.

Q Keep a fire extinguisher fir for electrical appliances near the

machine.

Q On the units installed indoor, connect the safety valve of the

refrigeration circuit to a piping network that can channel any
overflowing refrigerant outside.

Q Remove and leak of fluid inside and outside the unit.
Q Collect the waste liquids and dry any oil spillage.
Q Periodically clean the compressor compartment, to remove any

fouling.

Q Do not store flammable liquids near the unit.
Q Do not disperse the refrigerant and the lubricating oil into the

environment.

Q Weld only empty pipes; do not approach flames or other sources

of heat to refrigerant pipes.

Q Do not bend/hit pipes containing fluids under pressure.

2.6 Precautions during maintenance operations

Maintenance operations can be carried out by authorised technicians
only.

Before performing any maintenance operations:

Q Disconnect the unit from the mains with the external disconnecting

switch.

Q Place a warning sign “do not turn on - maintenance in progress”

on the external disconnecting switch.

Q Make sure that on-off remote controls are inhibited.

Q Wear suitable personal protective equipment (helmet, safety

gloves, goggles and shoes etc.).

To carry out any measurements or checks which require the
activation of the machine:

Q Work with the electrical board open only for the necessary time.

Q Close the electrical board as soon as the measurement or check

has been completed.

Q For outdoor units, do not carry out any operations in the presence

of dangerous climatic conditions (rain, snow, mist etc.).

The following precautions must be always adopted:

Q Do not scatter the fluids of the refrigeration circuit in the

surrounding environment.

Q When replacing an eprom or electronic cards, use always suitable

devices (extractor, antistatic bracelet, etc.).

Q To replace a compressor, the evaporator, the condensing coils or

any other weighty element, make sure that the lifting equipment is
consistent with the weight to be lifted.

Q In air units with independent compressor compartment, do not

access the fan compartment unless you have disconnected the
machine by the disconnecting switch on the board and you have
placed a warning sign “do not turn on - maintenance in progress”.

Q Contact manufacturer for any modifications to the refrigeration,

hydraulic or wiring diagram of the unit, as well as to its control
logics.

Q Contact manufacturer if it is necessary to perform very difficult

disassembly and assembly operations.

Q Use only original spare parts purchased directly from manufacturer

or the official retailers of the companies on the recommended
spare parts list.

Q Contact manufacturer if it is necessary to handle the unit one year

after its positioning on site or if you wish to dismantle it.

6

2 - Safety

2.7 Safety labels

Identification of the refrigerant - External door

Identification of the unit Outside, on the right-hand front column

Pump operation - Outside, on the right-hand front column

LAS BOMBAS MONTADAS EN ESTA UNIDAD NO PUEDEN TRABAJAR SIN AGUA

DIE PUMPEN DIESES GERÄTES DÜRFEN NICHT OHNE WASSER BETRIEBEN WERDEN

THE PUMPS ON BOARD OF THIS UNIT CAN NOT WORK WITHOUT WATER
LES POMPES A BORD DE CETTE UNITE NE PEUVENT PAS FONCTIONNER SANS EAU
LE POMPE ABORDO DI QUESTA UNITÀ NON POSSONO FUNZIONARE SENZA ACQUA

Circuit drain - Outside, on the right-hand front column

Use of filter and flow switch - Adjacent to fittings

E’OBBLIGATORIO L’USO DI FILTRO E FLUSSOSTATO ACQUA

THE USE OF FILTER AND FLOW SWITCH IS MANDATORY

EL USO DEL FILTRO Y DEL INTERRUPTOR DE FLUJO ES OBLIGATORIO

L’UTILISATION DU FILTRE ET DU FLUXOSTAT EST OBLIGATOIRE

DER GEBRAUCH VON FILTER UND STRÖMUNGSWÄCHTER IST

VORGESCHRIEBEN

Lifting point - Base Fan Danger

Instruction for the movimentation - Outside the packaging

Electrical warning

Adjacent to the master switch

Pump drain - Outside, on the right-hand front column

USARE SOLO

R 410A

E

RECUPERARE FLUIDO - NON DISPERDERE NELL’AMBIENTE - REGOLAMENTO CEE N° 3093/94

RECOVER - DO NOT VENT - EEC REGULATION N° 3093/94

SPECIAL ESTER OIL

USE ONLY

ATTENTION! Don’t leave the unit with water inside hydraulic circuit during
winter or when it is in stand by.
ATTENZIONE! Non lasciare l’unità con acqua nel circuito idraulico durante
l’inverno o quando non è funzionante.
ATTENTION! Ne laissez pas l’unitè avec de l’eau dans le circuit hydraulique
pendant l’hiver ou quand elle ne travaille pas.
WARNUNG! Lassen Sie nicht das Wasser in die Schaltung während des
Winters oder wenn es nicht funktionient.
¡ATENCÍON! No deje el agua en el circuito hidráulico durante el invierno o
cuando no esta trabajando.

ATTENZIONE !

Prima di

aprire togliere

tensione

CAUTION !

Disconnect

electrical

supply before

opening

ACHTUNG !

Vor offnen des

gehauses

hauptschalter

ausschalten

ATENCION !

Cor tar la

corrente antes

de abrir

el aparato

ATTENTION !

Enlever

l’alimentation

electrique

avant d’ouvrir

MIN. 5 cm

7

English

2 - Safety

Grounding connection on the

electrical board,

adjacent to the connection

Read the instruction on the

electrical board

Fitting identification - Adjacent to fittings

Sequence phase control on the electrical board

Identification of refrigerant - Below identification of the unit

Parameter configuration - Inside the electrical board

Start-up warning - Outside the door

of the electrical board

Final Test Certificate - Inside the external door

ATTENZIONE

QUESTO COMPRESSORE RICHIEDE UN CORRETTO

SENSO DI ROTAZIONE RISPETTARE LA CORRETTA

SEQUENZA DELLE FASI.

THIS COMPRESSOR REQUIRES PROPER DIRECTION

OF ROTATION CHECK PROPER ELECTRICAL PHASING

CAUTION

KOMPRESSOREN BENÖTIGEN KORREKTES DREHFELD

ELEKTRISCHE ANSCHLÜSSE AUF DREHFELD ÜBERPRÜFEN

ACHTUNG

CES COMPRESSEURS NECESSITENT UN BON SENS
DE ROTATION VERIFIER LE CABLAGE DES PHASES

ATTENTION

ESTOS COMPRESORES DEBEN FUNCIONAR EN

EL SENTIDO DE ROTACIÓN CORRECTO COMPROBAR

EL CABLEADO DE LAS FASES

ATENCIÓN

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2 - Safety

REFRIGERANT DATA SAFETY DATA: R410A

Toxicity Low.

Contact with skin

If sprayed, the refrigerant is likely to cause frost burns. If absorbed by the skin, the danger is very limited;
it may cause a slight irritation, and the liquid is degreasing. Unfreeze the affected skin with water.

Remove the contaminated clothes with great care - in the presence of frost burns, the clothes may stick
to the skin. Wash with plenty of warm water the affected skin.

In the presence of symptoms such as irritation or blisters, obtain medical attention.

Contact with eyes

Vapours do not cause harmful effects. The spraying of refrigerant may cause frost burns.
Wash immediately with a proper solution or with tap water for at least 10 minutes, and then obtain

medical attention.

Ingestion

Very unlikely - should something happen, it will cause frost burns.
Do not induce vomiting. Only if the patient is conscious, wash out mouth with water and give some

250 ml of water to drink. Then, obtain medical attention.

Inhalation

R410A: remarkable concentrations in the air may have an anaesthetic effect, up to fainting.
The exposure to considerable amounts may cause irregular heartbeat, up to the sudden death of the

patient. Very high concentrations may result in the risk of asphyxia, due to the reduction in the oxygen
percentage in the atmosphere. Remove the patient to fresh air and keep warm and at rest.

If necessary, give oxygen. In case of breathing difficulties or arrest, proceed with artificial respiration.
In case of cardiac arrest, proceed with cardiac massage. Then, obtain medical attention.

Recommendations

Semiotics or support therapy is recommended. Cardiac sensitisation has been observed that, in
the presence of circulating catecholamines such as adrenalin, may cause cardiac arrhythmia and
accordingly, in case of exposure to high concentrations, cardiac arrest.

Prolonged exposure

R410A: a study on the effects of exposure to 50,000 ppm during the whole life of rats has identified the
development of benign testicle tumour.

This situation should therefore be negligible for personnel exposed to concentrations equal to or lower
than professional levels.

Professional levels R410A: Recommended threshold: 1000 ppm v/v - 8 hours TWA.

Stability R410A: Not specified.

Conditions to avoid Do not use in the presence of flames, burning surfaces and excess humidity.

Hazardous reactions

May react with sodium, potassium, barium and other alkaline metals.
Incompatible substances: magnesium and alloys with magnesium concentrations > 2%.

Hazardous decomposition
products

R410A: Halogen acids produced by thermal decomposition and hydrolysis.

2.8 Safety regulations

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2 - Safety

REFRIGERANT DATA SAFETY DATA: R410A

General precautions

Do not inhale concentrated vapours. Their concentration in the atmosphere should not exceed the
minimum preset values and should be maintained below the professional threshold. Being more weighty
than the air, the vapour concentrates on the bottom, in narrow areas. Therefore, the exhaust system must
work at low level.

Respiratory system protection

If you are in doubt about the concentration in the atmosphere, it is recommended to wear a respirator
approved by an accident-prevention

Authority, of the independent or oxygen type.

Storage

Cylinders must be stored in a dry and fresh place, free from any fire hazard, far from direct sunlight or
other sources of heat, radiators etc.

Keep a temperature below 50 °C.

Protective clothing Wear overalls, protective gloves and goggles or a mask.

Accidental release measures

It is important to wear protective clothing and a respirator.
Stop the source of the leak, if you can do this without danger. Negligible leaks can be left evaporating

under the sun, providing that the room is well ventilated.
Considerable leaks: ventilate the room. Reduce the leak with sand, earth or other absorbing substances.
Make sure that the liquid does is not channelled into gutters, sewers or pits where the vapours are likely

to create a stuffy atmosphere.

Disposal

The best method is recovery and recycling. If this method is not practicable, dispose according to an
approved procedure, that shall ensure the absorption and neutralization of acids and toxic agents.

Fire fighting information R410A: Not flammable in the atmosphere.

Cylinders The cylinders, if exposed to fire, shall be cooled by water jets; otherwise, if heated, they may explode.

Protective fire fighting equipment In case of fire, wear an independent respirator and protective clothing.

2.8 Safety regulations (continued)

10

2 - Safety

LUBRICANT OIL DATA SAFETY DATA: POLYESTER OIL (POE)

Classification Not harmful.

Contact with skin

May cause slight irritation. Does not require first aid measures. It is recommended to follow usual
personal hygiene measures, including washing the exposed skin with soap and water several times a day.

It is also recommended to wash your overalls at least once a week.

Contact with eyes Wash thoroughly with a suitable solution or tap water.

Ingestion Seek medical advice immediately.

Inhalation Seek medical advice immediately.

Conditions to avoid

Strong oxidising substances, caustic or acid solutions, excess heat.
May corrode some types of paint or rubber.

Protection of the
respiratory system

Use in well ventilated rooms.

Protective clothing

Always wear protective goggles or a mask. Wearing protective gloves is not mandatory, but is
recommended in case of prolonged exposure to refrigerant oil.

Accidental release measures

It is important to wear protective clothing and, especially, goggles.
Stop the source of the leak. Reduce the leak with absorbing substances (sand, sawdust or any other

absorbing material available on the market).

Disposal

The refrigerant oil and its waste will be disposed of in an approved incinerator, in conformity with the
provisions and the local regulations applicable to oil waste.

Fire fighting information

In the presence of hot liquid or flames, use dry powder, carbon dioxide or foam. If the leak is not burning,
use a water jet to remove any vapours and to protect the personnel responsible for stopping the leak.

Cylinders The cylinders exposed to a fire will be cooled with water jets in case of fire.

Fire fighting protective equipment In case of fire, wear an independent respirator.

2.8 Safety regulations (continued)

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3 - Transport, Handling and Storage

EWFAIB units are supplied fully assembled and tested (except for
accessories supplied loose in the units – absorbers, filter, etc.). They
are ready to be installed and started on the field.

R410A units are only charged with liquid refrigerant and with oil in the
quantity required for operation.

WARNING

The low pressure side of the refrigerating circuit
on R410A units shall be charged by means
of the service valve arranged on the thermal
expansion valve before the device is operated.

3.1 Inspection

The unit shall be immediately inspected upon receipt to find out any
damage since it has been delivered ex works and transported at the
customer’s risk. It is also necessary to make sure that all the parcels
specified on the delivery note have been delivered.

Any damage you may find out shall be immediately reported in writing
to the carrier. Even if the damage is only on the surface, please notify
our local representative too.

The manufacturer disclaims all responsibility for the shipment even if
it has provided for its organisation.

3.2 Handling

EWFAIB units are designed to be lifted from above, by means of
cables and eyebolts. A spacer shall be arranged between the cables
in order to prevent them from damaging the unit (see the figure
aside).

Before handling the devices, make sure the site you have chosen for
the installation can withstand its weight and support its mechanical
impact.

Avoid touching sharp parts (such as the fins of batteries, for example)
while handling the unit.

WARNING

The unit shall never be placed on rollers.

Act as follows to lift and handle the unit:

Q

Insert and secure the eyebolts into the frame holes which have
been marked on purpose.

Q

Connect the cables to the eyebolts.

Q

Insert the spacer between the cables.

Q

Provide for hooking at the centre of gravity of the device.

Q

Cables shall have such a length that the angle they form with the
horizon when under tension is not less than 45°.

Holes Ø 30 mm

WARNING

While lifting and handling the unit, pay attention.
Otherwise, you might damage the finned block
of the coils arranged on both sides of the unit.
The sides of the unit shall be protected by
cardboard or plywood sheets.

Space requirements request to handling

MIN. 5 cm

12

3 - Transport, Handling and Storage

WARNING

Until the unit is ready for operation, do not
re move the pl astic envel ope and the coil
protections which are intended to prevent dirt,
dust and any foreign matter from penetrating
into the unit through the inlets of fans or from
damaging the external surfaces.

3.3 Anchoring

It is not essential to secure the unit to the foundations, unless in areas
where there is a serious risk of earth-quake, or if the appliance is
installed on the top of a steel frame.

3.4 Storage

If the unit is to be stored before the installation for some time, take
at least the following precautions to prevent damage, corrosion and/
or deterioration:

Q

Make sure all openings, such as for example water connections,
are well plugged and sealed.

Q

Never store the units in a room where temperature is above
50 °C (R410A units) or where the units are directly exposed to
the sunlight.

Q

Minimum storage temperature is -25 °C.

Q

It is recommended to leave the finned coils covered to protect
them against any risk of corrosion, especially if building works
are still in progress.

Q

Store the units in areas where minimum activity is likely to take
place in order to avoid any risk of accidental damage.

Q

Never use steam to clean the unit.

Q

Remove all the keys required to have access to the control panel
and give them to the person in charge of the field.

It is also recommended to provide for visual inspections at regular
intervals.

13

English

4 - Installation

4.1 Installation Site

DANGER

Before installing the unit, make sure that
the building structure and/or the supporting
surface can withstand the weight of the
device. The weights of the units are detailed
by Chapter 9 of this manual.

These units have been designed to be installed on the floor, in the
open air. As a standard, they are equipped with rubber vibration­damping supports which shall be arranged in the middle, beneath
the supporting plates.

When the unit is to be installed on the ground, provide for a concrete
bedplate which shall assure a uniform distribution of the weights. No
special subbase is generally required.

When selecting the installation site, never forget to consider as
follows:

Q

The longitudinal axis of the unit shall be parallel to the direction of

the prevailing winds so as to assure a uniform air distribution on
finned exchangers.

Q

The unit shall never be installed in the proximity of chimneys for

the discharge of boiler flue gases.

Q

The unit shall never be installed downwind of sources of grease

contaminated air, such as for example the outlets of large­kitchen extractors. Otherwise, grease might build up on the fins
of refrigerant / air exchangers or condensers, act as a fixing
agent for any sort of atmospheric impurity and rapidly cause the
exchangers to clog.

Q

The unit shall never be installed in areas exposed to heavy

snowfalls.

Q

The unit shall never be installed in areas exposed to flooding or

beneath drip stones, etc.

Q

The unit shall never be installed in narrow inner court yards or in

any other restricted space where the noise may be reflected by
the walls or where the air expelled by the fans may short-circuit
on the refrigerant/air heat exchangers or condensers.

Q

The installation site shall be characterised by the presence of

the space required for air circulation and for the performance of
maintenance operations (see chapter 9 for further details).

4.2 External Water Circuit

WARNING

The external water circuit shall guarantee a
constant water flow rate through the circulating
refrigerant/water heat exchanger (evaporator)
under steady operating conditions and in case
of a load variation.

The circuit shall be composed by the following elements:

Q

A circulation pump which can ensure the necessary flow rate and

head.

Q

The total content of the primary water circuit shall never be

lower than 2.5 lt/kW in terms of refrigerating capacity. If the total
water volume in the primary circuit should be unable to reach
such a value, an additional heat-insulated storage tank should be
installed. This tank is intended to avoid any repetitive start of the
compressor.

Q

A membrane expansion tank complete with a safety valve and a

drain which shall be visible.

NOTE

The expansion tank shall be dimensioned in
such a way that it can absorb a 2% expansion
of the total volume of the water in the plant
(exchanger, pipelines, uses and storage tank,
if available). The expansion tank shall never
be insulated when the circulating fluid is not
flowing through it.

A differential pressure switch is mounted as a standard. It will stop
the unit whenever it senses a load loss through the heat exchanger
which may result in a flow rate problem.

In addition:

Q

Install on/off valves (accessory) on the lines at the inlet and outlet

of the manifolds of the exchangers (evaporator).

Q

Arrange a by-pass complete with an on/off valve between the

manifolds of the heat exchangers.

Q

Arrange air vent valves at the high points of the water lines.

Q

Arrange drain points complete with plugs, clocks, etc. in the

proximity of the low points of the water lines.

Q

Insulate the water lines to prevent the heat from blowing back into

the unit.

14

External water circuit

4 - Installation

SAFETY/CONTROL DEVICES

A Inlet water temperature sensor
B Outlet water temperature sensor
C Water differential pressure switch (105 mbar)
D Vent valve
E Water safety valve (3 bar)
F Manometer

FS Flow switch

G Thermometer

I Hydrometer

Unit side

Y Water drain

10

10

9 9

13

12

12 11

11

4

5

3

8

6

3

Y

HYDROKIT

INLET

OUTLET

Y

Y

2

3

1

7

FS

F

E

E

D

D

C

A

B

I

G

G

COMPONENTS
1 Plate heat exchanger
2 Pump
3 Draining valve
4 Water buffer tank
5 Water filter
6 Automatic water charging valve
7 Pressure expansion tank
8 Water charging line

9 Water outlet
10 Water inlet
11 Globe valve
12 Flexible pipes
13 By-pass valve

15

English

4 - Installation

WARNING

Before filling the installation, remove any
impurity, such as sand, crushed stones and
welding scales, coating drops and any other
material which might damage the evaporator.

It is advisable to flush with disposable water bypassing the exchanger
to avoid clogging.

NOTE

The water used to fill the circuit shall be treated
in such as way that the pH will have the correct
value.

When two or several units are connected in parallel, to balance the
load losses of the various circuits, it is recommended to execute a
“reverse return” connection (see the diagram below).

UNIT 1

UNIT 2

Legend

S On/Off valves
VG Balancing valves

4.3 Water connections

The flow switch and the filter water, although not included in the
supply, must always be fitted such as plant components.
Their installation is mandatory for warranty.

WARNING

The attachments at the water inlet and outlet
shall be connected in compliance with the
instructions which can be found on the labels in
the proximity of the attachments.

Connect the water lines of the plants with the attachments of the unit
whose diameters and positions are shown in Chapter 9.

4.4 Defrost water drainage

When heat pump units work in heating mode, during defrosting
cycles, they may discharge water from the base. This is why the
units should be installed at least 200 mm above the floor level, so
as to allow the free drainage of waste water, without the risk of
producing ice banks.

The heat pump units must be installed in positions where the
defrosting water cannot create any damage.

4.5 Water buffer tank

The accumulation tank which has been designed to be mounted on
units is complete with all the hydraulic and electrical components
required for the correct operation of the system.

These systems are carefully assembled and tested at works. They
are ready for operation after having correctly realised all electrical
and hydraulic connections.

4.5.1 Features

Units have one single tank. The kit will include an Antifreeze Electric
Heater, a drain valve, an automatic filling unit and an automatic air
vent.

No pump is arranged on the kit since it is mounted on the unit.
A tank arranged for mounting a heating booster resistance kit may be

optionally required (5 traps).
The tank is completely insulated with 30 Kg/m

3

closed cell
polyethylene in a silver colour and enclosed by a bearing structure
made of passivated and painted plates. The box is equipped with
bulkheads which can be easily opened for internal inspection.

The kit is installed beneath the unit. It is an integral part of the unit
without changing the support area.

4.5.2 Supplied Material

The kits will be supplied with pipelines ready for installation. An
antifreeze resistance with wiring, an automatic water filling valve, a
3 bar safety valve, a drain valve and a vent valve have already been
assembled.

Hydrokit is shipped with a film to protect it from atmospheric agents.
Packaging has been designed in order to stack it up.

4.5.3 Antifreeze Electric Heater

The antifreeze resistance of the tank (TEH) shall be wired with the
panel as it is shown by the diagram attached to the unit.

4.5.4 Water Filter

The kit will use the water filter of the unit.

WARNING

Don’t leave the unit with water inside the circuit
during the winter or when it is in stand by,
unless water is properly mixed with glycol.

16

4.6 Power supply

DANGER

Before carrying out any operations on the
electrical system, make sure that the unit is
deenergized.

DANGER

It is important that the appliance is grounded.

WARNING

The company in charge of the installation shall
conform to the standards applicable to outdoor
electrical connections.

The manufacturer may not be held liable for any damage
and/or injury caused by failure to comply with these

precautions.

The unit conforms to EN 60204-1.
The following connections shall be provided:

Q

A 3-phase and grounding connection for the power supply circuit.

Q

The electrical distribution system shall meet the power absorbed

by the appliance.

Q

The disconnecting and magnetothermal switches must be sized

to control the starting current of the unit.

Q

The power supply lines and the insulation devices must be

designed in such a way that every line independent.

Q

It is recommended to install differential switches, to prevent any

damage caused by phase drops.

Q

The fans and compressors are supplied through contactors

controlled from the control panel.

Q

Each motor is provided with an internal safety thermal device and

external fuses.

Q

The power supply cables must be inserted into dedicated

openings on the front of the unit, and the will enter the electrical
board through holes drilled on the bottom of the board.

4 - Installation

CAUTIONS

The unit + tank system shall be equipped with a filter. Use the filter
+ union as it is shown by Figure 1.

Positioning rubber

shock absorbers
Water filter
position

Figure 1

4.5.5 Installation Procedure

The hydrokit shall be arranged beneath the unit. It will not change its
overall dimensions (Figure 1).

Arrange the rubber shock absorbers beneath the kit before providing
for its connection.

Provide for the hydraulic and electrical connections. Doing that,
observe the diameters shown by the quoted drawings.

The wiring for the standard antifreeze resistance is arranged as it is
shown by . The resistance is connected with the main terminal box.

See the wiring diagram attached to the unit for the correct execution
of the electrical connections.

Install the water filter as it is shown by Figure 1.

17

English

Antifreeze
Resistance Wiring

Storage Kit (112 l) - Dimensional Data

4 - Installation

1352

4 holes Ø9

1477

92 213 195

62.5 62.5

33 33 434

390

186

200106

43

500

A

C

B

Front view Side view

Top view

A Water inlet on the plant side Ø1 ½” gas male
B Water outlet on the chiller side Ø1 ½” gas male
C Water filling ؽ” gas male

18

4 - Installation

4.7 Electrical connections

The unit must be installed on site according to the usual
procedures and standards applicable in the place of
installation. The unit must not be operated if its installation
has not been carried out according to the instructions
provided in this manual.

The power supply lines must consist of insulated copper
conductors, dimensioned for the maximum absorbed

current.

Connection to terminals must be performed according to the diagram
of connections (User’s Terminal Box) provided in this manual and
according to the wiring diagram which accompanies the unit.

WARNING

Before connecting the power supply lines, check
that the available voltage value does not exceed
the range specified in the Electric Data (Chapter

9).

For 3-phase systems, check also that the unbalance between the
phases does not exceed 2%. To perform this check, measure the
differences between the voltage of each phase couple and their mean
value during operation. The maximum % value of these differences
(unbalance) must not exceed 2% of the mean voltage.

If the unbalance is unacceptable, contact the Energy Distributor to
solve this problem.

WARNING

Supplying the u nit t hroug h a line whose
unbalance exceeds the permissible value will
automatically void the warranty.

The unit conforms to EN 61000-3-12: Electromagnetic compatibility
(EMC) Part 3-12: Limits - Limits for harmonic currents produced
by equipment connected to public low voltage systems with input
current ›16 A and r 75 A per phase. Conformity depends on public
mains power supply with short-circuit power Ssc 1.9MVA at the
point of connection (see table 4 of the standard with Rsce 120).

19

English

Electrical Connections

4 - Installation

20

5 - Start-up

WARNING

The unit must be started for the first time by
personnel suitably trained by one of Authorised
Service Centre. Failure to meet this requirement
will immediately void the warranty.

NOTE

Th e operations carr ied out by authoris ed
personnel are limited to the start-up of the
unit, and do not include any other operation
on the plant, such as, for example, electrical
and hydraulic connections etc. All the other
operations before start-up, including oil pre­heating for at least 12 hours, must be performed
by the Installer.

5.1 Preliminary check

The checks listed below shall be performed before starting the unit
and before the arrival of the personnel authorised.

Q

Check the section of power supply and grounding cables; make

sure that terminals are tightened and check the correct operation
of contactors, with the main switch open.

Q

Check that any voltage and phase variation in the power supply

does not exceed the prefixed thresholds.

Q

Connect the contacts of the flow switch and the thermal relay of

the pump and of the other devices (if any), to terminals 1-2 and
3-4, respectively.

Q

Check that the components of the external water circuit (pump,

user equipment, filters, power supply tank and reservoir, if any)
have been installed properly, and according to the manufacturer’s
instructions.

Q

Check the filling of the hydraulic circuits, and make sure that

the fluid circulation is correct, without any trace of leaks and air
bubbles. If you use ethylene glycol as antifreeze, check that its
percentage is correct (do not exceed 35% glycol percentage).

Q

Check that the direction of rotation of the pumps is correct, and

that fluids have been circulating for at least 12 hours for both
pumps. Then, clean the filters on the suction side of the pumps.

Q

Adjust the liquid distribution network in such a way that the flow

rate is within the specified range.

Q

Check that the water quality is up to the specifications.

Q

Check that oil heaters, if any, have been turned on at least 12 hours
before.

5.2 Start-up

Start-up sequence:

Q

Turn on the Main switch (at least 12 hours before).

Q

Check that the oil in the compressor has reached the requested

temperature (the minimum temperature outside the pan must be
approx. 40°C) and that the auxiliary control circuit is energised.

Q

Check the operation of all the external equipment, and make sure

that the control devices of the plant are properly calibrated.

Q

Start the pump and check that the water flow is correct.

Q

Set the desired fluid temperature on the control board.

Q

Start the appliance (see Chapter 6).

Q

Check the correct direction of rotation of compressors. Scroll

compressors cannot compress the refrigerant when they rotate
in the opposite direction. To make sure that they are rotating in
the correct direction, simply check that, just after the star t-up
of the compressor, the pressure drops on the LP side and rises
on the HP side. Furthermore, if a scroll compressor rotate in
the opposite direction, there is a considerable rise in the sound
level of the unit, as well as in a dramatic reduction of current
absorption compared to normal values. In case of wrong rotation,
the scroll compressor can be definitely damaged.

Q

After about 15 minutes of operation check that there are no

bubbles, through the sight glass on the liquid line.

WARNING

The presence of bubbles may indicate that a
part of the refrigerant charge has been released
in one or more points. It is important to remove
these leaks before proceeding.

Q

Repeat the start-up procedure after removing the leaks.

5.3 Checking the operation

Check the following:

Q

The temperature of the water entering the evaporator.

Q

The temperature of the water leaving the evaporator.

Q

The level of the water flow rate in the evaporator, if possible.

Q

The current absorption upon the start of the compressor and in

case of stabilised operation.

Q

The fan’s current absorption.

Check that the condensing and evaporation temperatures, during
operation at high and low pressure detected by the pressure gauges
of the refrigerant, are within the following range :

(On the units not provided with HP/LP pressure gauges for the
refrigerant, connect a pressure gauge to the Shrader valves on the
refrigeration circuit).

HP side

Approx. 15 to 21 °C above the temperature of the
air entering the condenser, for R410A units.

LP side

Approx. 2 to 4 °C below the temperature of the
leaving chilled water, for R410A units.

5.4 Delivery to the customer

Q

Train the user according to the instructions provided in Section 6.

21

English

Introduction

This document contains the infor ma ti on a nd the operating
instructions for

EWFAIB units.

This information is for the after-sales service and the production
operators, for the end-of-line testing.

Main characteristics

Microprocessor control:

Q

User-friendly keyboard.

Q

Access code to enter the Manufacturer’s Level.

Q

Alarm and LED.

Q

Backlighted LCD.

Q

Counting of the pump/compressors’ hours of operation.

Q

Display of discharge and suction pressure values.

Q

Display of temperature sensors.

Q

History of stored alarms.

The following accessories can be also connected:

Q

Wire remote control.

6.1 Control of EWFAIB units, single compressor,

variable speed

EWFAIB units are provided with a microprocessor card which is fully
programmed by default for the control of a heat pump unit.

General information

The figure shows the terminal with the front door open.
It is provided with a 3 green digits with 7 segments with decimal

point LED, so as to allow the programming of the control parameters
(setpoint, differential bands, alarm thresholds) and the main
operations to be carried out by the user.

Keypad description

The terminal makes it possible to carry out the following operations:

Q

The initial configuration of the machine.

Q

The change of all the main operating parameters.

Q

The display of the detected alarms.

Q

The display of all the measured quantities.

6 - EWFAIB Control

The terminal and the card are connected by a 4-wire cable.
The connection of the terminal to the basic card is not essential for

the normal operation of the controller.

6.2 Keypad functions

In normal display mode, the following information is available:

Q

Inlet (return) water temperature, in tenths of a degree Celsius,

with one decimal point.

Q

The alarm code, if at least one alarm is active. In the case of

several active alarms, the first alarm is displayed based on Alarm
Chart hierarchy.

Q

OFF if the unit is in complete shut-down mode (heating and

cooling).

Q

dFr if the unit is defrosting.

Q

In MENU mode, the data displayed depends on the device's

status. Labels and codes are used to help the user identify a pre­programmed function.

Access to inputs/outputs and
data points menu. In the “menu”
mode:

– Navigate downwards in the

menu (level R sub-level R
value).

– Exit and save the new values.

In the “menu” mode:

– Scroll the settings.
– Increase the value.

In the “menu” mode:

– Scroll the settings.
– Reduce the value.

In the “menu” mode:

– Navigate upwards in the

menu (level R sub-level R
level).

– Exit without saving the new

values.

+

22

6 - EWFAIB Control

On= alarm active, check the
alarm codes.

On= compressor operating.

Flashing= compressor on
stand-by to start up

Indicator light

6.3 Alarms

The red alarm indicator light is on and the beep sounds if one or
several alarms is/are active.

Press the alarm button

to stop the audible warning and reset the alarm. Check the presence
of other alarms in the Err menu.

6.4 Menus

The display comprises several menus. Some have unrestricted
access and one (the Manufacturer menu) is password protected.

6.4.1 General menu

23

English

6 - EWFAIB Control

6.4.2 Set menu

6.4.3 tP menu

24

6 - EWFAIB Control

6.4.4 I-O menu

25

English

6.4.5 Err menu

6 - EWFAIB Control

6.4.6 LOG menu

6.4.7 PAr menu

26

6 - EWFAIB Control

6.4.8 PSS menu

27

English

6 - EWFAIB Control

6.4.9 OHr menu

6.5 Starting the appliance

After checking all the electrical connections and making any
rectifications as required, proceed with starting up the installation.

6.5.1 Simplified start-up procedure

6.5.1.1 Checks

On the display of the unit, check the coherence of the temperature
probes on the tP menu. It is preferable to adjust the settings of the
water compensation before starting up the unit.

6.5.1.2 Water compensation rule

The H09 setting is used to pre-adjust the water law.

Q

0= air conditioning (AC).

Q

1= cooling / heating floor (CHF).

Q

2= fixed water set-point.

28

6 - EWFAIB Control

6.5.1.3 Operating condition

29

English

6 - EWFAIB Control

6.5.1.4 Water compensation (heating operation)

Example:

Q

HEA= heating water set-point before correction R 35 [°C].

Q

H14= Max OAT with min LWT R 15 [°C].

Q

H15 = ¨ temperature on OAT R 10 [K].

Q

H16 = ¨ temperature on LWT R 15 [K].

6.5.1.5 Water pump circulation adjustment

The P01 setting is used to adjust the operation of the water circulation
pump.

Q

0= continuous operation even when the unit is in stopped mode.

Q

1= continuous operation except when the unit is in stopped mode.

Q

2= continuous operation on demand. The water circulation pump

stops when the ambient temperature exceeds the set point.

WATER COMPENSATION RULE

30

6 - EWFAIB Control

6.6 Parameters list

PARAMETER DESCRIPTION UNIT MIN MAX DEFAULT TYPE

SET

HEA Heating set-point °C 25 55

35 R CHF

45 R AC

R/W

HEr Actual heating set-point °C R

COO Cooling set-point °C -8 18

18 R CHF

7 R AC

R/W

COr Actual cooling set-point °C R

Nb Neutral band K 0.1 5 1 R/W

O-F ON-OFF OFF R/W

H-C Operation mode (heating/cooling) Heating R/W

tP

t01 Return water temperature °C -50 90 R
t02 Leaving water temperature °C -50 90 R
t03 Outdoor coil temperature °C -50 90 R
t04 Outdoor air temperature °C -50 90 R
t05 Discharge gas temperature °C 0 120 R

t06 Suction gas temperature °C -50 90 R
P06 Suction pressure bar 0 15 R
P07 Discharge pressure bar 0 15 R

I/O-DO

1 Lower fan part-load 0 (opened) C (closed) R
3 4WV status 0 (opened) C (closed) R
4 Pump status 0 (opened) C (closed) R
5 Heat exchanger antifreeze heater status 0 (opened) C (closed) R
6 Compressor oil heater status 0 (opened) C (closed) R
7 General alarm status 0 (opened) C (closed) R

I/O-DO

2 Low pressure switch status 0 (opened) C (closed) R

3

Pump motor protection/differential flow
switch/flow switch status

0 (opened) C (closed) R

4 Remote cooling/heating status 0 (opened) C (closed) R
6 Fan motor protection status 0 (opened) C (closed) R
9 Remote ON/OFF status 0 (opened) C (closed) R

I/O-EEV

Pos EEV steps (position) step 0 480 R

SH EEV superheat K R

I/O-DCI

Spd Compressor speed rps 0 120 R

Cur Compressor absorbed current A R

I/O

FAn Fan speed % 0 100 R

dFr Time to next defrost min 0 60 R
ERR Alarms code R
LOG Alarms history code R

31

English

6 - EWFAIB Control

PARAMETER DESCRIPTION UNIT MIN MAX DEFAULT TYPE

PAR-CnF

H01 Software release R

H03 Type of application

0= air conditioning (AC)
1= cool/heat floor (CHF)
2= fixed water set point (FIX)

R

H04 DCI size R

PSS-CnF

H09 Selection of type of application

0= air conditioning (AC)
1= cool/heat floor (CHF)
2= fixed water set point (FIX)

2

R/W

H11 Outdoor air temperature probe activation

OFF= disable outdoor
air temperature probe
ON= enable outdoor
air temperature probe

ON

R/W

H14 Max air temperature for water compensation °C 0 25

15

R/W

H15 ¨T on air temperature for water compensation °C 0 40

15 R CHF

25 R AC

R/W

H16

¨T on water temperature for water
compensation

°C 0 20

10 R CHF

15 R AC

R/W

H29 DI9 function

OFF

R/W

H30 DI9 meaning 0 1

0

R/W

H31 LWT max - cooling/heating floor °C 30 55

45

R/W

H32 EWT/LWT antifreeze thresold °C -10 20

5

R/W

H33 Antifreeze hysteresis K 0 9.9

2

R/W

H34 EWT/LWT antifreeze alarm thresold °C -10 10

4

R/W

H35 Antifreeze alarm hysteresis K 0 9.9

2

R/W

PSS-PuP

P01 Pump operation mode

0= always ON
1= ON if unit is ON
2= ON if compressor demand
is ON

1

R/W

P02 Interval between anti-clogging cycles h 0 99

24

R/W

P03 Lenght of anti-clogging cycles s 0 999

60

R/W

PSS-dFr

d01 Time to next defrost min 0 99 R
d02 Actual temperature for defrost timer start °C -20 5 R
d03 Temperature for defrost timer start °C -20 10

-2

R/W

d04 Interval between defrost cycles min 0 60

40

R/W

d05 Temperature for defrost exiting °C 0 30

15

R/W

PSS-rtc

hr Time R

sAt Date R
chd Update date R/W
chh Update time R/W

OHr

ch Compressor operating hours R
cS Number of compressor start-up R
Ph Pump operating hours R
PS Number of pump start-up R

32

6 - EWFAIB Control

6.7 Alarm list

CODE DESCRIPTION ALARM ORIGIN

E01 Return water temperature probe failure

UNIT BOARD

E02 Leaving water temperature probe failure
E03 Outdoor air temperature probe failure
E05 Outdoor coil temperature probe failure
E06 Water flow / pump motor alarm
E08 Fan motor alarm
E12 Low pressure alarm by logic
E22 Stop defrost for maximum time excess
E23 Stop defrost for minimum LWT (‹10 °C)
E24 Discharge gas temperature › Discarghe gas temperature limit
E25 Low pressure alarm by LPS cut-out
E32 Alarm - LWT/EWT reverse sensors

E33 Alarm - high ¨T (LWT-EWT)
E37 Alarm - EWT/LWT antifreeze
E38 Return water temperature ›Return water temperature limit
E50 Discharge gas temperature probe failure
E51 Suction gas temperature probe failure
E52 Suction gas pressure probe failiure
E53 Compressor start-up failure
E60 Driver auto-tune fault

COMPRESSOR DRIVER

E61 Driver over voltage

E62 Driver under voltage

E63 Driver DC ripple too large

E64 Driver over current

E65 Driver over temperature

E66 Driver thermistor fault

E67 Driver under temperature

E68 Flash memory error

E69 Hardware over current

E70 Modbus communication lost

E71 Motor overload

E72 Inverter offline

E73 Parameter default

E74 Motor over temperature

E75 Motore phase

E76 Speed default

E77 Fan default

E78 Communication loss

E79 High discharge pressure

E80 Start-up failure (resume)

E81 Enevelope alarm

E82 High discharge temperature

E83 Low pressure difference (lack of lubrication)

E84 Suction gas pressure probe failure

EEV DRIVER

E85 Suction gas temperature probe failure

E86 Discharge gas pressure probe failure

E87 Discharge gas temperature probe failure

33

English

7 - Product Description

7.1 General Information

EWFAIB units are one-block type with one refrigerant circuit. They
are intended to cool down the water required for any air-conditioning
application as well as any other fluid, such as for example glycol
water.

These units are completely assembled at works. They are equipped
with all the refrigerating connections and the internal electrical wiring
required for a rapid installation on the field.

An operation test is performed after assembly, with water flowing
through the refrigerant/water exchanger in order to make sure that
every refrigerating circuit is properly working. The refrigerating
circuits of every unit are pressure tested before inspection, drained
and charged with R410A.

A low noise level is the result of a careful study. It is achieved on
chillers by using technologically advanced components without
negatively affecting the operation performances and limits of the
units.

EWFAIB models can cool down chilled water at a temperature
between + 18 and - 8 °C.

EWFAIB heat pump models can warm up water at a temperature
between 20 °C and 50 °C for

EWFAIB 20-35 and 55 °C for EWFAIB 40-75.

All units can operate with a double set point.

Body and Frame

The base and frame of these units are made with galvanized steel
elements, assembled with stainless steel screws. All panels can
be removed to ensure easy access to internal components. All
galvanized steel parts are protected by epoxy powder paint.

Compressors

EWFAIB units are equipped with a scroll compressors, with
brushless direct current motor (BLDC) type.

The compressors are assembled on rubber shock absorbers. They
are cooled down by the refrigerant gas.

Compressors are powered on and off by the microprocessor of the
unit control system which is intended to control the delivery of the
thermal refrigerating capacity.

Evaporators

Evaporators are made of stainless steel plates. They are thermally
insulated by means of a thick flexible insulating mattress with closed
cells. The maximum operating pressures correspond to 10 bar

for the water side and to 45 bar for the refrigerant side. Antifreeze
protection for the water in the exchangers is ensured by electrical
heaters and differential pressure switches. The water side of these
exchangers is connected by manifolds which will provide for the
connection to the plant by means of one single 1”1 gas threaded
attachment.

Condensing coils

Condensers are coils made of copper tubes arranged in staggered
rows and mechanically expanded inside an aluminium finned pack
with blue fins treatment as a standard.

The maximum operating pressure on the refrigerant side of the
condensing batteries is 45 bar.

Condenser Fans

The condenser fans are of a helical type. They are directly coupled
and have an impeller with wing contoured aluminium blades.
Each fan is equipped with a galvanised steel accident-prevention
protection which is painted after manufacture. The fans motors
are completely closed. They have an IP54 protection degree and a
protection thermostat embedded in the windings.

Fans Control

All models are equipped with a single-phase voltage fan speed
controller using the principle of phase control to adjust the effective
voltage output to the load, based on the phase of the PWM control
signal according the pressure measured on the heat exchanger.

Refrigerating Circuits

Each unit has a single refrigerating circuit equipped with an external
service valves intended to measure the refrigerant pressure and
charge, a sight glass with a humidity indicator, a dryer filter and a
electronic expansion valve.

Refrigerating circuits are also complete with a high and low pressure
switch as well as a high and low transducer.

Control Supply Panel

All components of the control system and those necessary to start
the motors are shop connected and tested. The control compartment
contains an electronic card and a control board with an external
keyboard and display, to show the operational functions, as well as
the intervention of the alarms and the working blocks.

34

7 - Product Description

7.2 Accessories EWFAIB 20-35

Water Filter

1-1/2” filter is included in the supplied equipment.
It is supplied loose and has to be mounted by the customer.

Anti-Vibration Kit

Anti-vibration kit made of special rubber pad is provided together
with the unit.

Water Differential Pressure Switch

Water differential pressure switch is mounted as standard in the unit.

Flow switch kit

Flow switch kit is available as an accessory. It is supplied loose and
as to be mounted by the customer. Connect terminals 1-2 of the flow
switch with terminals 1-2 of the Aqu@Logic electrical box.

Intrusion proofing protection for condensing

A galvanised and painted steel wire net protection is assembled
outside the unit.

Water Gauge

It is assembled on the unit as a standard.

Pump

Min. 100 kPa head pressure pump is mounted as a standard in the
unit.

No pump kit

No pump kit is available as an accessory whenever the customer
doesn’t need pump fitted in the unit.

35

English

7 - Product Description

Airway Packaging

Complete wooden package for units without refrigerant and with
nitrogen precharge. No refrigerant charge is shipped loose with
the unit. The customer has to fill the unit through the apposite
connection.

Water buffer tank

The hydro module is available for the units with a pump. It is installed
beneath the unit through the connection pipe supplied with the unit.

The module is entirely enclosed in a RAL 9001 galvanised and
painted steel body. The tank is completely insulated with 30 Kg/m

3

closed cell polyethylene in a silver colour.
Antifreeze resistances or a heating booster kit are installed in the tank

(upon request).

On/Off Remote Kit

It enables the operator to power on the unit when it is in standby
mode, to display alarms and to switch over cooling – heat pump. The
kit will include a 3 metre long cable for installation on the wall.i.

Sequencer kit - 4 units

It can easily pilot up to 4 units fitted in parallel, 50 metres maximum
apart.

Gauge kit

Gauge kit is available as accessory. It is shipped loose and it’s not
possible to have it factory mounted.

Fan speed control -10 °C

Fan speed control is available as accessory to allow the chiller to
operate down to external air temperature.

In/out valve kit

In/Out valve kit is available as accessory.

36

7 - Product Description

5

H

D

3

2

AT

4

7

6

9

ON

8

F

1

M

SL

BT

S

EXV

CONTROL

UNIT

CONTROL

INVERTER

A

20

20

20 20

E

C

K

B

SH

SAFETY/CONTROL DEVICES

A High pressure switch H Defrost temperature sensor

Pipe connection with Shrader valve

AT High pressure transducer I Hydrometer
BT Low pressure transducer L Vent valve ------- Optional parts
C Water differential pressure switch M Discharge temperature sensor

Sensors

D Air temperature sensor N Water safety valve
E Outlet water temperature sensor S 5/16" Shrader valve (charging point)
F Inlet water temperature sensor SH 5/16" high pressure Shrader valve
FS Flow switch SL 5/16" low pressure Shrader valve

COMPONENTS
1 Compressor tandem scroll type
2 4-way valve
3 Air cooled condenser
4 Biflow filter drier
5 Sight glass
6 Biflow thermostatic expansion valve
7 Liquid receiver
8 Plate heat exchanger

9 Pump
10 Drain valve
11 Water buffer tank
12 Water filter (supplied loose)
13 Automatic water charging valve
14 Water outlet
15 Water inlet
16 Water charging line
17 Pressure expansion tank

7.3 Refrigerant flow diagram -

EWFAIB 20 to 35 - R410A

37

English

8.1 Hydraulic Features

Units EWFAIB 20-35

8 - Technical Data

350

[kPa]

Water flow rate [l/s]

325

300

275

250

225

200

175

150

125

100

75

50

25

0

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0

25-30

25-30

20

20

1

2

4

3

1

and

2

unit external static pressure curves.

3

and

4

plate heat exchanger water pressure drop curves.

700

[kPa]

675

650

625

600

575

550

525

500

475

450

425

400

Water flow rate [l/s]

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0

20-25-30

38

EWFAIB 20 25 30

Power supply V/ph/Hz 400/3+N/50

Number of refrigerant circuits 1

Part load steps % Stepless

REFRIGERANT

Type R410A

Charge (1) kg 7.5 9.0 9.0

COMPRESSOR

Type Scroll (BLDC Motor)

Number 1

Start-up type Inverter

Oil type PVE

EVAPORATOR

Type Plate

Number 1

Water flow Rate l/s

Refer to hydraulic circuit data

Water pressure drop kPa

FANS

Type Axial

Number 2

Speed rpm 630

Air flow rate l/s 3.4 3.2 3.2

Power input kW 0.6 0.6 0.6

COIL

Type Finned tubes

Number 1

Frontal surface mm 1.350 x 1.500

Rows 2 3 3

PUMP

Type Centrifugal

Number 1

Speed rpm 2.800

Water flow rate l/s

Refer to hydraulic circuit data

Water available static pressure kPa

WATER CONNECTIONS

Type Male GAS threated

Inlet diameter inch 1”1/2

Outlet diameter inch 1”1/2

Water drain connection inch 3/8”

WEIGHT

Shipping weight kg 269 285 285

Operating weight kg 262 279 279

DIMENSIONS

Lenght mm 1.477

Width mm 538

Height mm 1.625

8.2 Physical data

8 - Technical Data

(1) Indicative value. Always refer to the value specified on the unit’s label.

39

English

EWFAIB 20 25 30

Power supply V/ph/Hz 400 ± ( 10%)/3+N/50

Maximum power input kW 12.0 14.3 14.3

Maximum current input A 24.9 30.1 30.1

Start-up corrent A 5.2 5.2 5.2

External fuses A 32 32 32

Max cable section (*) mm

2

10 10 10

HEAT EXCHANGER RESISTANCE

Power supply V/ph/Hz 230 ± ( 10%)/1/50

Maximum power input W 35

8 - Technical Data

(*) The dimensioning of the unit’s power cables is the responsibility of the installer, who shall consider: the rating, the maximum working

temperature in the room, the type of insulation and the cable laying, the maximum lenght of the power supply line.

8.3 Electrical data

8.3.1 Compressor electrical data

EWFAIB 20 25 30

Power supply V/ph/Hz 400 ± ( 10%)/3/50

Number 1

Maximum power input kW 10.8 13.0 13.0

Nominal current input A 15.0 18.0 20.0

Maximum current input A 19.7 24.9 24.9

Crankcase heater (230±(10%)/1/50) W 40

8.3.2 Fan electrical data

EWFAIB 20 25 30

Power supply V/ph/Hz 230 ± ( 10%)/1/50

Number 2

Maximum power input kW 0.3+0.3 0.3+0.3 0.3+0.3

Nominal current input A 1.8+1.8 1.8+1.8 1.8+1.8

8.3.3 Pump electrical data

EWFAIB 20 25 30

Power supply V/ph/Hz 400 ± ( 10%)/3/50

Number 1

Maximum power input kW 0.65 0.65 0.65

Nominal current input A 1.6 1.6 1.6

40

8.4 Dimensional Drawings

8 - Technical Data

Front view Side view

Top view

Dimensions in mm.

1408

149 200

Ø30

30

I L

E

H

A

D

C

B

F

G

Ø30

35

1441

457

703

713

766

813

27

538

16

2

5

510

18

1477

A Water inlet Ø1 ½” gas male

B Water outlet Ø1 ½” gas male

C Auxiliary lines

D Electrical power supply

E Sight glass inspection

F High pressure tap

G Low pressure tap

H Gauge kit (optional)

I Main switch

L Control keypad/display

41

English

8.5 Space Requirements

8 - Technical Data

800 mm

400 mm

200 mm

200 mm

200 mm

42

9 - Maintenance

Carefully read the “Safety” section of this manual before carrying
out any maintenance operations.

DANGER

Do not discharge the refrigerant into the
atmosphere while the refrigeration circuits
are being drained. Use appropriate recovery
equipment.

When the recovered refrigerant cannot be re­used, return it to the manufacturer.

DANGER

Do not throw away the waste oil of the
compressor, because it contains refrigerant in
solution.

The waste oil must be returned to the
manufacturer.

Unless otherwise specified, the operations described below may be
carried out only by a trained maintenance operator.

9.1 General requirements

Units have been designed for continuous operation, providing
that they are subjected to regular maintenance, within the limits
specified in this manual. Each unit must be serviced according to the
programme by the User/Customer, and must be inspected at regular
intervals by the personnel of one authorised Service Centers.

It is the responsibility of the User to meet these maintenance
requirements and/or to enter into an agreement with one of authorised
Service Centers, so as to properly safeguard the operation of the
appliance.

During the warranty period, in case of damage or failures caused
by improper maintenance, manufacturer will not refund the costs
incurred to repair the appliance in its original state.

The provisions of this section apply only to standard units; according
to the order requirements, other documentation may be added,
concerning any modifications or supplementary accessories.

9.2 Planned maintenance

Maintenance inspections must be carried out according to the
program below, by a qualified person.

As a general rule, units cannot be repaired directly by the user, who
shall not try to service or repair any failures or anomalies identified
during daily inspections. If you are in doubt, please contact authorised
Service Centre.

Operations

Daily

Weekly

Monthly

Beginning

of season

End of

season

Check the temperature
of the leaving fluid

•

Check the pressure drops
in the heat exchanger

•

Check for electric absorption

•

Check suction pressure
and temperature

•

Check delivery pressure
and temperature

•

Check the oil level in the compressor

•

Check that there are no gas bubbles
in the liquid line

•

Check that the fins of
the external coil are clean (if any)

•

Check the operation of the oil heaters

•

Check the remote control switches

•

Check the operation
of the LP pressure switch

•

Check the operation
of the HP pressure switch

•

Check the insulation of
the heat exchanger

•

Check that terminals are tightened

•

Check that the terminals’
screws are tightened

•

Clean the exterior of the unit
with water and soap

•

Check the density
of the antifreeze (if any)

• •

Check the operation
of the flow switches

•

Check the operation
of the solenoid valve

• •

43

English

9 - Maintenance

9.3 Refrigerant charge

WARNING

Do not inject refrigerant liquid into the LP side
of the circuit. Be very careful, and charge the
circuit properly.

If the charge is insufficient, the efficiency of
the unit will be lower than expected. In the
worst of cases the LP transducer may stop
the unit.

In the presence of an excess charge,
the condensing pressure will rise (in the
worst of cases, the HP pressure switch
may be activated, resulting in the stop of
the equipment), and the consumption will
increase as well.

WARNING

It is strictly forbidden to use the compressor
as a vacuum pump to drain the plant.

Fill the refrigeration circuit after it has been drained for maintenance
purposes (leaks, replacement of the compressor etc.). The amount
of the charge is indicated on the plate affixed to the unit.

Before refilling, it is important to drain and de-hydrate the circuit,
thus obtaining a minimum abs. pressure value of 50 Pa.

Inject the refrigerant fluid before removing the vacuum, then fill the
circuit up to 90% of the total gas requirement (in liquid form). The
appliance must be filled through the filling valve on the liquid line, on
the outlet side of the condenser.

It is recommended to connect the refrigerant cylinder to the filling
valve on the liquid line, and to arrange it in such a way as to inject
only liquid refrigerant.

9.4 Compressor

Compressors are delivered with the necessary charge of lubricating
oil. During normal operation, this charge is sufficient for the whole
life of the unit, providing that the efficiency of the refrigeration circuit
is satisfactory and if it has not been overhauled.

If the compressor needs to be replaced (following a mechanical
failure or if burnt), contact one of authorised Service Centers.

WARNING

Compressors use polyester oil. During
maintenance operations on the compressor,
or if you have to open the refrigerant circuit
in any point, remember that this type of oil
is highly hygroscopic, and accordingly it is
important that it is not left exposed to the
weather for prolonged periods, as this would
require the replacement of the oil.

9.5 Condenser

The condenser’s coils consist of copper pipes and aluminium fins.
In the presence of leaks caused by any damage or shock, the coils
shall be repaired or replaced by one authorised Service Center. To
ensure the effective and correct operation of the condenser coils, it
is important to keep the condenser’s surface perfectly clean, and to
check that there is no foreign matter, such as leafs, wires, insects,
waste etc. If the coil becomes dirty, there is an increase in the
absorption of electric energy. Fur thermore, the maximum pressure
alarm may be activated and may halt the unit.

WARNING

Be careful not to damage the aluminium fins
during cleaning.

The condenser must be cleaned with a LP compressed air jet, parallel
to the aluminium fins, in the direction opposite to the air circulation.

To clean the coil you can use also a vacuum cleaner, or a jet of water
and soap.

9.6 Fans

The fans of the condenser, of axial type, are complete with impeller
with aerodynamic profile blades and a cylindrical nozzle. The
motor’s bearings are lubricated forever.

9.7 Dehydrating filter

The refrigeration circuits are provided with dehydrating filters.
The filter clogging is marked by the presence of air bubbles in the

sight glass, or by the difference between the temperatures measured
downstream from and upstream of the drying filter. If, once the
cartridge has been cleaned, there are still some air bubbles, the
appliance has lost a part of the refrigerant charge in one or more
points, that must be identified and serviced.

44

9 - Maintenance

9.8 Sight glass

The sight glass is used for inspecting the refrigerant flow and the
humidity % of the refrigerant. The presence of bubbles indicates that
the dehydrating filter is clogged or the charge insufficient.

A colour indicator is positioned inside the sight glass. If you compare
the colour of the indicator to the scale on the ring of the sight glass,
you can calculate the percentage of humidity of the refrigerant. If it
is excessive, replace the filter’s cartridge, operate the appliance for
1 day and then check the humidity % again. When the humidity % is
within the pre-determined range, no other operations are required. If
the humidity % is still too high, replace the dehydrating filter again,
start the unit and operate it for another day.

9.9 Electonic expansion valve

The circuit of the unit is equipped with a thermostatic expansion
valve, with external equalizer.

The valve is factory calibrated for an overheating of 5 °C.
Procedure to check for overheating :
– Measure the suction pressure with the pressure gauges on the

board of the unit o using a pressure gauge connected to the
service valve on the suction side.

– From the pressure gauge’s temperature scale, measure the

saturated suction temperature (Tsa) which corresponds to the
pressure value.

– Using a contact pressure gauge affixed to the outlet fitting of the

gas of the evaporator, measure the actual temperature (Tse).

Overheating calculation (S):
S = Tse - Tsa
Overheating is regulated through the driver.
If the expansion valve cannot be regulated, it is probably broken, and

shall be replaced. The replacement must be carried out by a Service
Centre.

9.10 Evaporator

Check at regular intervals that the water side of the heat exchanger
is perfectly clean. To do this, measure the pressure drop, water side
(see Section 8) or measure the temperature of the liquid leaving
and entering the heat exchanger, and compare it to the evaporation
temperature.

To obtain an effective heat exchange, the difference between the
temperature of the leaving water and the saturated evaporating
temperature must be in the 2 - 4 °C range. A greater difference
would indicate a low efficiency of the heat exchanger (i.e. the heat
exchanger is dirty).

In this case, the heat exchanger must be subjected to chemical
cleaning, an operation that shall be carried out by authorised
engineers.

For other maintenance operations (extraordinary overhauling,
replacement of the heat exchanger etc.), contact an authorised
Service Centre.

45

English

10 - Troubleshooting

The table below lists the anomalies of operation of the unit, the relevant causes and the corrective measures. For anomalies of any other type or
not listed, contact one of authorised Service Centre for technical assistance.

Anomaly Cause Operation

The unit continues

to work, but without

cooling

Insufficient charge of refrigerant. Refill.
The dehydrating filter is clogged. Replace.

Ice on the suction line Wrong calibration of overheating.

Increase overheating.
Check the charge.

Excessive noise

Vibration of lines. Check the clamping brackets, if any.

Whistler emitted by the thermostatic expansion
valve.

Refill.
Check the dehydrating filter.

Noisy compressor.

Seized bearings; replace the compressor.
Check that the compressor’s locknuts are tightened.

Low oil level in the

compressor

One or more gas or oil leaks in the circuit. Identify and remove leaks.
Mechanical failure of the compressor. Request the intervention of a Service Centre.

Anomaly of the oil heater of the compressor’s
base.

Check the electric circuit and the resistor of the heater of the
motor base, and replace defective components.

One or both

compressors are not

working

Breaking of the electric circuit.

Check the electric circuit and detect any ground dispersions and
short circuits. Check fuses.

Intervention of the HP pressure switch.

Reset the pressure switch and the control panel and restart
the appliance. Identify and remove the cause that enabled the

pressure switch.
The fuse of the control circuit is broken. Check for ground dispersions and shor t circuits. Replace fuses.
Loosened terminals. Check and tighten.

Halt caused by thermal overload of the electric
circuit.

Check the operation of check and safety devices. Identify and

remove the cause.

Wrong wiring. Check wiring of check and safety devices.

The line voltage is too low.

Check voltage. If problems regard the system, solve them. If

they are caused by the distribution network, inform the Energy

Distributor.
Short-circuit of the compressor’s motor. Check the continuity of the winding.
Seized compressor. Replace the compressor.

Activation of the LP
alarm, stop of the unit

Gas leak. Identify and remove the leak.
Insufficient charge. Refill.

Activation of the HP
alarm, stop of the unit

Failure of the pressure switch.

Check the operation of the pressure switch, replace it if

defective.

The delivery valve is partially closed. Open the valve and replace it, if faulty.

Substances with condensable gases in the
circuit.

Drain the circuit.

The fan of the condenser is stopped. Check cables and motor. If defective, repair or replace.

The liquid line is too hot Insufficient charge. Identify and remove the cause of the loss of charge and refill.

Frosting of the liquid
line

The valve of the liquid line is partially closed. Check that valves are open.
The liquid filter is clogged. Replace the cartridge or the filter.

46

11.1 Spare part list

The table below shows the list of spare parts recommended during
the first two years of operation.

11.2 Oil for compressors

The compressors are lubricated with polyvinil oil (PVE).

11.3 Wiring diagrams

The wiring diagrams are installed inside the doors of the electrical
panels of the unit. Any request for wiring diagrams shall be forwarded
to manufacturer’s Service Centre.

Component Number

Fan 1
High pressure switch 2
Differential water pressure switch 1
High pressure transducer 2
Low pressure transducer 2
Expansion valve 1
Gas filter 1
Four-way valve 1
Electronic main board 1
Auxiliary main board transformer 1
Auxiliary circuit transformer 1
Compressor contactor 2
Pump contactor 1
Water sensor 4
Air sensor 1
Automatic switch compressor protection 2
Automatic switch pump protection 1
Auxiliary contact 4
Fan capacitor 1
Auxiliary switch 1
Fuses 4

11 - Spare Parts

47

English

12 - Dismantling, Demolition and Scrapping

DANGER

During the draining of the refrigeration
circuits, do not let the refrigerant overflow in
the surrounding atmosphere.

The circuit must be drained using suitable
recovery equipment.

DANGER

Do not disperse the waste oil of the
compressors in the environment, since it
contains some dissolved refrigerant.

For the disposal, contact the competent authority for information.

Unless otherwise specified, the maintenance operations listed below
may be carried out by any trained maintenance operator.

12.1 Generalities

Open each line that supplies the unit, including the ones of control
circuits. Make sure that all disconnecting switches are secured
in the off position. The power cables can be disconnected and
disassembled. Refer to Chapter 4 for the position of connection
points.

Remove all the refrigerant from the refrigeration circuits of the
unit and store it in suitable containers, using a recovery unit. If its
characteristics have remained the same, the refrigerant can be used
again. Contact the competent authority to obtain information about
disposal. In NO event shall the refrigerant be discharged into the
atmosphere. The oil in each refrigeration circuit must be drained and
collected into a suitable container; then it shall be disposes of in
conformity with local regulations that apply to the disposal of waste
lubricants. Any oil spillage must be recovered and disposed of in like
manner.

Isolate the unit’s heat exchangers from the external hydraulic circuits
and drain the heat exchange sections of the plant.

DANGER

If no shutoff valves have been provided, it may
be necessary to drain the whole plant.

If a glycoled solution or a similar fluid has been
used in the hydraulic circuits, or if chemical
additives have been added to the circulating
water, the circulating fluid MUST be drained in
a proper way.

For NO reason shall a circuit containing
glycoled water or a similar solution be
discharged directly into the drains or surface
waters.

After draining operations, the piping of the hydraulic networks can be
disconnected and disassembled.

Once they have been disconnected as specified, the packaged units
can be disassembled in a single piece. First of all, disassemble
the anchoring screws and then lift the unit from the position of
installation, and hook it to the lifting points provided, using suitable
lifting equipment.

To this end, refer to Chapter 4 for the installation of these appliances,
to Chapter 9 for their weights and Chapter 3 for handling.

The units that, once disconnected, cannot be removed in a single
piece, must be dismantled on site; in this case, be very careful with
the weight and handling of every single component.

It is always advisable to dismantle the units following the installation
steps, but in reverse.

DANGER

Some residues of oil, glycoled water or similar
solutions may remain in certain parts of the
unit. These residues must be recovered and
disposed of according to the procedures
specified above.

It is very important to ensure that, while a component of the unit is
being removed, all the others are properly supported.

DANGER

Use only lifting means of adequate capacity.

Once disassembled, the components of the unit can be disposed of
in conformity with current regulations.

12.13 Ref. 207384 rev.100

Reserved the right to make changes without previous notice.

HIPLUS AIRE ACONDICIONADO S.L.
C/ Masia Torrents, 2 Tel. [phone] Fax [phone]
08800 VILANOVA I LA GELTRÚ- BARCELONA –ESPAÑA
Internet: http://www.hitecsa.com E-mail: [e-mail]