Electra Air-Conditioning MQH 6 Manual

Zertifizierungsstelle / Organismo Notificado No. 0035
Библиотека СОК 

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English

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The units, manufactured to state-of-the-art design and
implementation standards, ensure top performance,
reliability and fitness to any type of air-conditioning
system.
These units are designed for cooling water* or glycoled
water (and for water heating in heating mode) 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.
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.
These units are delivered completely 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 prior written authorisation.
This warranty shall apply provided that the installation
instructions have been complied with (either issued by
the manufacturer, or deriving from the current practice).
In order for this warranty to be valid, the following condi-
tions shall be met:
The chiller installation and maintenance must be carried
out by skilled personnel only (where possible, by Autho-
rised Service Centers).
Use only original manufacturer spare parts.
Carry out all the planned maintenance provided for by
this manual in a timely and proper way.
Unit is used with relative humidity between 0-95%
Unit is used at altitude < 1000 meter
Units is not be used at sites where there is exposure to
blast.
1.2 Warranty
Failure to comply with any of these conditions will automati-
cally void the warranty.
1.3 Emergency stop / Normal stop
1.4 An introduction to the manual
The emergency stop of the unit can be enabled using the
main switch.
For a normal stop, break the relevant connection,or press
the right side button˚on display board for 5 seconds.
To restart the appliance, follow the procedure detailed in this
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.
Common symbols throughout the manual:
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.
The Warning sign precedes those procedures
that, if not followed, may result in serious damage
to the appliance.
The Attention sign contain important observations.
Foreword
1 FOREWORD
1.1 Introduction
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 Authorised
Service Centers).
This manual and its contents, as well as the documentation
which accompanies the unit, are and remain the property of
the manufacturer or its authorised distributor, which reserves
any and all rights thereon. This manual may not be copied, in
whole or in part, without manufacturer's written authorization.
* Note: minimum leaving water temperature from evaporator:
+ 4°C.
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Safety
2 SAFETY
2.1 Foreword
These units must be installed in conformity with the provi-
sions of Machinery Directive 2006/42/EC, Low Voltage Direc-
tive 2006/95/EC, Pressure Vessels Directive 97/23/ EC,
Electromagnetic Interference Directive 89/336/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.
The guards of the fans must be always
mounted and must never be removed before
re-energising the appliance.
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 respecting all the recommendations
provided by this manual. It is important that the
unit is adequately supported, as detailed in this
manual. Non-compliance with these recom-
mendations may create hazardous situations
for the personnel.
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.
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.
The packaging material must not be disposed of in
the surrounding environment or burnt.
The unit must be grounded, and no installation
and/or maintenance operations may be carried out
before deenergising the electrical panel of the unit.
Main fuse must be installed in the main power
line,please refer to the technical data for sizing.
Failure to respect the safety measures mentioned above may
result in electrocution hazard and fire in the presence of any
short-circuit
Inside the heat exchangers, the compressors
and the refrigeration lines, this unit contains
liquid and gaseous refrigerant under pressure.
The release of this refrigerant may be dangerous
and cause injuries.
The units are not designed to be operated with
natural refrigerants, such as hydrocarbons.
The manufacturer may not be held liable for
any problems deriving from the replacement of
original refrigerant or the introduction of
hydrocarbons.
The units are designed and manufactured according to the
requirements of European Standard PED 97/23/EC (pres-
sure vessels).
OPERATOR: means a person authorised by the owner to do
on the 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.
2.2 Definitions
The refrigerants used are included in group II (non-haz-
ardous fluids).
The maximum working pressure values are mentioned on
the unit's data plate.
Suitable safety devices (pressure switches and safety
valves) have been provided, to prevent any anomalous
overpressure inside the plant.
The vents of the safety valves are positioned and ori ented
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.
Dedicated guards (removable panels with tools) avoid
contacts with potential dangerous zones.
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OWNER: means the legal representative of the company,
body or individual who owns the plant where the 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 compa-
ny who has been given by the owner the job of positioning
and performing the hydraulic, electric and other connections
of the 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.
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Safety
ENGINEER: means a person authorised directly by the
agent or, in all EC countries, excluding Italy, under his full
responsibility, by the distributor of the unit, 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 main switch can be used to cut off power during emer-
gency by turning the knob to off position
For no reason shall any unauthorised personnel be left alone
in contact with the unit.
2.4 General precautions
When you approach or work on the unit, follow the precau-
tions listed below:
do not wear loose clothing or jewellery or any other acces-
sory that may be caught in moving parts
if the unit is placed in a closed room, wear ear protection
devices
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
do not use your hands to check for any pressure drops
use tools in a good state of maintenance; be sure to have
understood the instructions before using them
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
be sure to have perfectly understood the operating instruc-
tions before carrying out any operation on the control panel
when you have to work on the control panel, always keep
the operating instructions within reach
start the unit only after you have made sure that the
connection to the plant is perfect.
promptly inform the ENGINEER about any alarm involving
the unit
do not reset manual restoration alarms unless you have
identified and removed their cause
Prevention of residual mechanical risks
install the unit according to the instructions provided in this
manual
carry out all the periodical maintenance operations
prescribed by this manual
do not touch air condensation coils without wearing protec-
tive gloves
do not remove the guards from moving elements while the
unit is running
check the correct position of the moving elements' guards
before restarting the unit
before opening any panelling of the machine, make sure
that it is secured to it by hinges(if available)
Prevention of residual electrical risks
connect the unit to the mains according to the instructions
provided in this manual
periodically carry out all the maintenance operations speci-
fied by this manual
disconnect the unit from the mains by the external discon-
necting switch before opening the electrical board
check the proper grounding of the unit before start-up
periodically check the board's internal wiring
check all the electrical connections, the connecting cables,
and in particular the insulation; replace worn or damaged
cables
do not use cables having an inadequate section or flying
connections, even for limited periods of time or in an emer-
gency
The unit must be placed in an area which can be accessed
by (and only 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.
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.
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
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Safety
Prevention of other residual risks
make sure that the connections to the unit conform to the
instructions provided in this manual and on the unit's
panelling
if you have to disassemble the unit, make sure that it has
been properly mounted again before restarting the unit
do not touch the delivery pipes from the compressor, the
compressor and any other piping or component inside the
machine before wearing protective gloves
on units installed indoor, connect the safety valve of the
refrigeration circuit to a piping network that can channel
any overflowing refrigerant outside
keep a fire extinguisher fit for electrical appliances near
the machine
collect the waste liquids and dry any oil spillage
remove and leak of fluid inside and outside the unit
periodically clean the compressor compartment, to
remove any fouling
do not store flammable liquids near the unit
do not disperse the refrigerant and the lubricating oil into
the environment
weld only empty pipes; do not approach flames or other
sources of heat to refrigerant pipes
do not bend/hit pipes containing fluids under pressure
disconnect the unit from the mains with the external
disconnecting switch
place a warning sign "do not turn on - maintenance in
progress" on the external disconnecting switch
make sure that on-off remote controls are locked out with
active safety lock.
wear suitable personal protective equipment (helmet,
safety gloves, goggles and shoes etc.)
work with the electrical board open only for the necessary
time
close the electrical board as soon as the measurement or
check has been completed
2.6 Precautions during maintenance
operations
Maintenance operations can only be carried out by autho-
rised technicians. Before performing any maintenance
operations:
To carry out any measurements or checks which require the
activation of the machine:
for outdoor units, do not carry out any operations in the
presence of dangerous climatic conditions (rain, snow,
mist etc.)
do not scatter the fluids of the refrigeration circuit in the
surrounding environment
when replacing an EPROM or electronic cards, always
use suitable devices (extractor, antistatic bracelet, etc.)
contact authorised or manufacturer distributor for any
modifications to the refrigeration, hydraulic or wiring
diagram of the unit, as well as to its control logics
contact authorised distributor if it is necessary to perform
very difficult disassembly and assembly operations
use only original spare parts purchased directly from
authorised distributor or the official retailers of the compa-
nies on the recommended spare parts list
contact authorised distributor if it is necessary to handle
the unit one year after its positioning on site or if you wish
to dismantle it.
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"
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
The following precautions must be always adopted:
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Safety
2.7 Safety regulations
Refrigerant data Safety data: R410A
Toxicity Low
Contact with skin R410A vapors can irritate the skin and eyes. In liquid form, it can freeze
skin on contact. If contact with skin occur, flush the exposed area with
lukewarm water until all of the chemical is removed. If there is evidence
of frostbite, bathe in lukewarm water.
Contact with eyes If contact with eyes occur, immediately flush with large amounts of
lukewarm water for at least 15 minutes, lifting eyelids occasionally to
facilitate irrigation. Seek medical attention as soon as possible.
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 atten-
tion.
Inhalation Inhalation of the R41 0A vapor may cause irritation. Vapor inhalation at
high concentrations may result in asphyxiation or the heart may become
sensitized, causing cardiac arrhythmia. When concentration of R410A
reach levels which reduce oxygen to 14-16% by displacement, symptoms
of asphyxiation will occur. An individual exposed to high concentrations of
R410A must be given medical attention immediately. Adequate ventila-
tion must be provided at all times.
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 concen-
trations equal to or lower than professional levels.
Professional levels
Stability R410A is stable under normal operating conditions.
Conditions to avoid Do not use in the presence of high temperatures, flames, burning
surfaces and excess humidity.
R410A: Recommended threshold: 1000 ppm v/v - 8 hours TWA.
Hazardous reactions Contact with certain red-hot metals may result in exothermic or explosive
reactions and yield toxic and/or corrosive decomposition products.
Specific materials to avoid include freshly abraded aluminum surfaces
and active metals such as sodium, potassium, calcium, powdered alumi-
num, magnesium and zinc.
Hazardous decomposition
products
R410A: Halogen acids produced by thermal decomposition and hydroly-
sis.
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Safety
General precautions Do not inhale concentrated vapours. Their concentration in the atmo-
sphere 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. There-
fore, the exhaust system must work at low level.
Respiratory system protection If you are in doubt about the concentration in the atmosphere, it is recom-
mended to wear a respirator approved by an accident-prevention Author-
ity, of the independent or oxygen type.
Storage Cylinders must be stored in a cool, dry and properly ventilated storage
area away from heat, flames, corrosive chemicals, flumes, explosives
and be otherwise protected from damage. Keep a temperature below
52°C.
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 venti-
lated. 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.
Protective clothing Wear overalls, protective gloves and goggles or a mask.
Accidental release measures
Disposal The best method is recovery and recycling. If this method is not practi-
cable, 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.
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Safety
Refrigerant oil data Safety data:Polyvinylether oil (PVE)
Classification Not harmful
Contact with skin May cause slight irritation. Does not require first aid measures. It isrec-
ommended to follow usual personal hygiene measures, including wash-
ing 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.
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).
Accidental release measures
Disposal The refrigerant oil and its waste will be disposed of in an approved incin-
erator, in conformity with the provisions and the local regulations appli-
cable to oil waste.
The cylinders exposed to a fire will be cooled with water jets in case of
fire.
In case of fire, wear an independent respirator.
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
Fire fighting protective equipment
Note: Please refer to the data plate on the unit for detail parameter.
2.8 Nameplate and Safety Label
Nameplate
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Safety
Safety Label
C26081700/02 C26081800/03
C26081700/02 C26081800/03
MQH 06/08M/08T
MQH 10M/10T/12/14/16/18
ʽ
ʽ ʽ
ʽ
Caution
Attention
Vorsicht
Attenzione
Precaución
Do not insert any object into fan grille
Ne pas insérer d’objets dans la grille du ventilateur
Führen Sie keine Gegenstände in das Ventilatorgitter ein
Non intodurre alcun oggetto nella griglia del ventilatore
No introduzca objetos en la rejilla del ventilador
Caution
Attention
Vorsicht
Attenzione
Precaución
Caution
Attention
Vorsicht
Attenzione
Precaución
Caution
Attention
Vorsicht
Attenzione
Precaución
Do not insert any object into fan grille
Ne pas insérer d’objets dans la grille du ventilateur
Führen Sie keine Gegenstände in das Ventilatorgitter ein
Non intodurre alcun oggetto nella griglia del ventilatore
No introduzca objetos en la rejilla del ventilador
Installing a 60 mesh strainer at the unit inlet pipe
Poser un filtre de de 60 mesh au tuyau d’admission de l’unité
Montieren Sie einen 60 Netzfilter an der Einlassröhre des Geräts
Installare un filtro grana 60 sul tubo d’ingresso dell’acqua
Instalar un depurador de malla 60 en la tubería de entrada de unidad
Drain
all water in the water system during non-operating time in winter
Vidangez toute l’eau du système d’eau en hiver, quand le système ne
fonctionne pas Lassen Sie während der Winterzeit, wenn das Gerät außer
Betrieb ist, alles Wasser aus dem Wassersystem ab Drenare tutta l’acqua del
sistema idrico durante il periodo di inattività invernoDrene toda el agua del
sistema durante los meses inactivos en invierno
ʽ
ʽ
Caution
Attention
Vorsicht
Attenzione
Precaución
Caution
Attention
Vorsicht
Attenzione
Precaución
Installing a 60 mesh strainer at the unit inlet pipe
Poser un filtre de de 60 mesh au tuyau d’admission de l’unité
Montieren Sie einen 60 Netzfilter an der Einlassröhre des Geräts
Installare un filtro grana 60 sul tubo d’ingresso dell’acqua
Instalar un depurador de malla 60 en la tubería de entrada de unidad
Drain all water in the water system during non-operating time in winter
Vidangez toute l’eau du système d’eau en hiver, quand le système ne
fonctionne pas Lassen Sie während der Winterzeit, wenn das Gerät außer
Betrieb ist, alles Wasser aus dem Wassersystem ab Drenare tutta l’acqua del
sistema idrico durante il periodo di inattività invernoDrene toda el agua del
sistema durante los meses inactivos en invierno
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Transport, Lifting and Positioning
3 TRANSPORT, LIFTING AND
POSITIONING
Air conditioners are supplied assembled. The equipment are
full of refrigerant and oil (except the condensing unit), in the
quantity required for a proper operation. The unit cannot be
transported at ambient temperature lower than -30°C.
When the unit is delivered, it is recommended to check it
carefully and to identify any damage occurred during trans-
portation. The goods are shipped ex-factory, at the buyer's
risk. Check that the delivery includes all the components
listed in the order.
In case of damage, note it down on the carrier's delivery note
and issue a claim according to the instructions provided in the
delivery note.
In the presence of any serious damage, that does not affect
the surface only, it is recommended to inform the distributor
or your service provider immediately.
Sharp edges and coil surfaces are a potential
hazard. Avoid contact with them.
Please note that the manufacturer may not be held liable for
any damage to the equipment during transportation, even
though the carrier has been appointed by the factory.
3.1 Inspection
3.2 Unit Handling
Picture 2
3.3 Anchoring
3.4 Storage
It is not essential to secure the unit to the foundations, unless
in areas where there is a serious risk of earthquake, or if the
appliance is installed on steel frame.
plug or seal every single opening, such as water fittings
do not store the unit in a room where the temperature will
exceed 70°C and the relative humidity exceed 85%, unit
with R410A,if possible, do not expose to direct sunlight
it is recommended to store the unit in a roof where traffic is
minimized, to prevent the risk of accidental damage
the unit must not be washed with a steam jet
take away and leave to the site manager all the keys
providing access to the control board
When the unit is to be stored before installation, adopt a few
precautions to prevent any damage or risk of corrosion or
wear:
Finally, it is recommended to carry out visual inspections at
regular intervals.
Be careful to avoid rough handling of the unit. Do
not push or pull the unit anything other than the base. Block
the pushing vehicle away from the unit to prevent damage to
the sheet metal cabinet and end frame (see picture 1).
Picture 1
Unit lifting
In case the unit need to be lifted,it shouled be lifted as shown
in picture 2 using belt or wire rope,keep unit balance and
move at speed <0.15m/s during lifting(for information)
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Blocking required
across (full width)

Installation
4 INSTALLATION
4.1 Installation advices
Unit placement
The MQH air-to-water heat pumps must be installed in the
open air, in an area where the flow of air to and from the
condenser coil must not be limited. A space restriction, which
reduces the air flow, will decrease the capacity, increase the
power input and, in some cases, prevent the unit from operat-
ing because of an excess of condensation pressure.
The MQH air cooled heat pumps are equipped with propeller
type condenser fan. Therefore, they will not operate with
ductwork on the fan outlet.
In case of installation in an area subject to be hit by strong
wind, direct effect of the wind on the discharge surface of the
fan should be avoided.
The minimum clearances are shown on chapter 8.4 and must
be considered, both to ensure that the unit operates correctly
and to allow easy access.
The units should be installed on a flat and hard, preferably
concrete base.
Care should be taken, at the time of installation, to leave
enough clearances around the unit for maintenance works.
When fixing the unit, a slope of 1 cm/m is recommended to
allow draining of rain water.
For heating mode, if the outdoor temperature is likely to fall
below +1 °C, provide a system to prevent the condensates
from freezing (e.g. heating cord).
For installation in difficult climates, temperatures below 0°C,
snow or humidity, it is recommended to elevate the unit about
20 cm above the floor.
MQH06 and MQH08M/T and MQH10M/T cannot
be installed with advanced inclination to 10°.
The metal grille is used to protect the operators
from injury risks on heat exchanger at the time of
handling and installation. However, risks of
clogging by freeze or hoar frost can be occured on
the units installed in cold or mountainous regions
and exposed to the elements.To prevent all risks,
a shelter is to be provided or simply remove the
protective grille.
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12
Installation
Fixing dimensions
The fixing dimensions of the unit are shown on picture 3.
Vibration isolators are recommended for all roof mounted installation or wherever vibration transmission is a
consideration.
Picture 3
Maintenance access
After installation, each side of the unit must allow easy access for periodic maintenance works.
The removal of panel 1 allows access to compressor, refrigerant circuit as well as hydronic module.
The fan-motor assembly is accessible after removing the panel 2 .
panel 2 panel 1 panel 2 panel 1
Remark: The panel 1 is removable independently of other panels and allows a start-up by maintaining the
operating characteristics of the unit.
English
Push to Open
w
eas
y
access
f
or periodic maintenance works.
s
so
r
,
refri
g
erant circuit as well as h
y
dronic module.
v
ing t
h
e
p
anel
2
.
p
anel
2
p
anel 1
Push to Open

Installation
4.2 Water connections
Water Piping
Vibration eliminators to reduce vibration and noise trans-
mission to the building. Check the free volume expansion
of the connection piping.
Local authorities can supply the installer with the proper
building and safety codes required for safe and proper instal-
lation.
Safety Differential Pressure Switch
A safety differential pressure switch is factory mounted
between water inlet and outlet piping of evaporator, in order
to ensure adequate water flow to evaporator before starting
up the unit. It comes into operation in case of drop in water
flow owing to the fact that the pump failed to operate. The
safety differential pressure switch is the main protective
device of the machine.
Install piping with minimum bends and changes in
elevation to minimize pressure drop. Consider the
following when installing water piping:
It is not our policy to make recommendations on
water treatment. The general contractor or owner
should contact a local water treatment company
regarding water treatment. However, this is
critical and care should be taken to make sure it is
done properly to prevent problems related to flow.
A fouled water system will lead to premature
component failure.
Water connections could be damaged by an
important stress when screwing them. Use a
second spanner to compensate the stress of
tightening.
Protection from freezing
It is recommended to protect the water system from freezing
whatever the model used. The table below shows the anti-
freeze concentration to be used depending on the minimum
outdoor temperature.
Minimum
outdoor temp.°C
Concentration
in %
1.
A means of maintaining adequate system water pressure
(expansion tank or regulating valve).
4.
Temperature and pressure indicators located at the unit to
aid in unit servicing.
5.
To avoid all risks of penetration of foreign matters
and to keep system performance up, it is mandatory
to install a strainer at the inlet of the unit.
6.
Manual or automatic air vent valves at the highest points
of the chilled water piping.
3.
Shut-off valves to isolate the unit from the piping system
during unit servicing.
2.
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14
Installation
4.3 Pressure Drop in Tubes and
Accessories
The grey area shows pressure drop in mm of water
gauge/m and the velocity in m/s recommended for various
flows and diameters.
Values outside the grey area correspond to excessive
pressure drops and should be avoided.
Table 2 shows the equivalent pipe length with the same
diameter, of a few common accessories for this type of
installation.
Intermediate values are determined through interpolation.
The water inlet/outlet fittings shall conform to the instructions
provided by the plates affixed neat the connection points.
4.4 Hydraulic connection
4.5 Principle Diagram of Water Circuit
Table 1
Pressure drop (mm WG / m)
Velocity (m/s)
Nominal diameter
Flow
(l/h)
Table 2
The MQH are to be connected with the terminal units such
as fan coil units, cassettes or wall mounted units. Each
terminal unit connected with the MQH heat pumps and
provided with its own control is therefore completely
independent of the chiller (see diagram of principle above).
* If the terminal unit is on a lower level than the MQH heat
pumps, make sure the water pressure in the heat pumps
unit is at least 0.5 bar.
When units work in heating mode, during defrosting cycles,
they may discharge water from the base.
The heat pump units must be installed in positions where the
defrosting water cannot create any damage.
4.6 Draining the defrosting waste water
Accessories
Equivalent length (m)
Nominal diameter
Ball check valve
1 mm WG = 9,81 Pa.
T-piece
45° Bend
90° Bend
90° Curve
English
To determine the appropriated pipe section, see table 1
which shows the values of pressure drop for various water
flows and the diameter of standard copper pipes for hydrau-
lic installations.

15
Installation
4.7 Power supply 4.8 Electrical connections
The unit must be installed on site according to the
Machinery Directive (2006/42/EC), the Low Voltage
Directive (2006/95/EC), the Electromagnetic Interference
Directive (89/336/EC) and 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.
Select the suitable cable to connect to the main switch firmly
according to the wire diagram.
Before carrying out any operations on the
electrical system, make sure that the unit is
deenergised.
It is important that the appliance is grounded.
A link for the power supply and the earth connection
The electrical distribution system shall meet the power
absorbed by the appliance.
The disconnecting and magnetothermal switches must be
sized to control the starting current of the unit.
The compressors are supplied through contactors
controlled from the control panel.
Each motor is provided with an internal safety thermal
device .
The power supply cables must be inserted into dedicated
openings on the right side of the unit.
The power supply lines and the insulation devices must be
designed in such a way that every line is independent.
The unit conforms to EN 60204-1.
The following connections shall be provided:
Before connecting the power supply lines, check
that the available voltage value does not exceed
the range specified in the Electric Data (Chapter
8).
Supplying the unit through a line whose unbalance
exceeds the permissible value will automatically
void the warranty.
It's recommended to check the correct sequence
of the three supply phases R-S-T- before the unit
start up.
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.
For MQH06/08M/08T, the wiring diagrams are installed
inside the top plate of the unit. For MQH10M/
10T/12/14/16/18, the wiring diagrams are installed inside
the right front panel of the unit. Any request for wiring
diagrams shall be forwarded to the Authorised Service
Centre.
4.9 Wire Diagram
Please see Appendix A
First of all, turn the knob to off position, then use remote
switch connect to terminals according to the diagram of
connections provided in this manual and according to the
wiring diagram which accompanies the unit. The remote
switch can be used to select ON/OFF or COOL-
ING/HEATING model.
English
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.

16
Start-up
5 START-UP 5.2 Start-up
Start-up sequence:
On MQH heat pump unit the first start up must be
done by an authorized technician. Following
suggestions should be applied in order to do the
operation properly.
5.1 Preliminary check
The checks listed below shall be performed before starting
the unit .
Check the section of power supply and grounding cables;
make sure that terminals are tightened and check the
correct operation of contactors, with the master switch
open.
Check that any voltage and phase variation in the power
supply does not exceed the prefixed thresholds.
Check that the components of the external water circuit
(user equipment, filters, power supply tank and reservoir, if
any) have been installed properly, and according to the
manufacturer's instructions.
Check the filling of the hydraulic circuits, and make sure
that the fluid circulation is correct, without any trace of
leaks and air bubbles.
Check that the direction of rotation of the pumps is correct,
and that fluids have been circulating for at least 4 hours.
Then, clean the filters on the suction side of the pumps.
Adjust the liquid distribution network in such a way that the
flow rate is within the specified range.
Check that the water quality is up to the specifications.
Check that oil heaters, if any, have been turned on at least
4 hours before (It is mandatory if the temperature
is under 15°C).
Turn on the main switch disconnector (at least 4 hours
before).
Check the operation of all the external equipment, and
make sure that the control devices of the plant are
properly calibrated.
Start the pump and check that the water flow is correct.
Set the desired fluid temperature on the control board.
Start the appliance (see Chapter 6).
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.
For 3 phase unit, check the phase monitor. If the green
LED light is on, means that the phase connection is
reverse, need to exchange any two phase connection of
three. When the red LED light is on, the compressor can
start up normally.
English

Start-up
5.3 Checking the operation
Check the following:
The temperature of the water entering the evaporator.
The temperature of the water leaving the evaporator.
The level of the water flow rate in the evaporator, if possible.
The current absorption upon the start of the compressor and in case of stabilised operation.
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
Schreader valves on the refrigeration circuit).
HP side
Approx. 13 to 18°C above the temperature of the air entering the condenser, for R410A units.
LP side Approx. the difference between the temperature of the leaving water and the saturated evapo-
rating temperature must be in the2-4°CforR410Aunits.
5.4 Delivery to the customer
Train the user according to the instructions provided in Section 6.
English

18
Control System
6 MINICHILLER CONTROL 4)
5) If an alarm is occured, the alarm code is displayed, but
after 30', even if the alarm is still active, the display shows
again the mode but "Alar" message is displayed for 2'
every 10' when an alarm is active. When we enter in
Alarm list, the first alarm code displayed is the last
occurred.
Table 4
Alarms Table
Fault description
Fault
code
ADC
CPE
EPF
REF
CPNC
EPNC
EWTH
EWTL
LWTH
LWTL
OATH
OATL
OCTL
OCTH
HP
HPC
LP
LO
HI
Cl
CIH
DEIC
OFF
COOL
HEAT
FS
CF1
OF1
PF
LOu
CONF
CFC1
ADC error
Turn on the main switch of the power line.
1)
For an ideal heating of the oil in the compressor's crank-
case and for a proper removal of the refrigerant from the
oil, the operation described in sub-paragraph 1) above
should be performed several hours before the actual
start-up of the equipment.
2)
6.1.2 Starting and using the Unit
To properly use the unit in full safety, please read and under-
stand the instructions provided below.
1)
2)
3)
Table 3
Status display
Display Description
When compressor is operating
Compressor in heat mode
De-ice in operation
Off mode
Cool mode with no compressors on
Heat mode with no heating on
Not allowed configuration
Low water volume
PF input open, pump internal overload
OF1 input open, outdoor fan overload
CF1 input open, compressor 1 overload
High pressure cut-out
Condensing pressure transducer failure, out of range.
Condensing pressure transducer failure, no change error.
Evaporating pressure transducer failure, no change error.
Entering water temperature sensor short circuited
Entering water temperature sensor disconnected
Leaving water temperature sensor short circuited
Leaving water temperature sensor disconnected
Outdoor air temperature sensor short circuited
Coil temperature sensor disconnected
Outdoor air temperature sensor disconnected
Coil temperature sensor short circuited
High pressure protection, automatic reset for first three
times
Low pressure limit, unit cut out
Leaving water temperature below allowed limits
Entering water temperature is too high
Flow switch opens, low water flow
CP and EP no change,compressor not operating (burn out
or phase change).
Refrigerant leak - low pressures.
Evaporating pressure transducer failure, out of range.
6.1 Operating instructions
6.1.1 Before start-up
Before starting the equipment:
English
To start the unit, close the remote switch according to
requirement, if display show OFF mode, press the right
button on display ^ for 5 seconds, please refer to the
wiredigram (see chapter 4.9). Break the connection the
unit willstop.
During the normal operation,if the connection between
No.6 and No. 7 terminal is closed, the unit will operate in
heating mode. When the connection is opened, the unit
wiu operate in cooling mode.
To modify the set-points, press both ^ and > keys at the
same time for 5s, then the "OPEr" message appears on
the display. The parameters are scrolled using the ^
button and selected using the > button. When selected,
the values can be changed by using the ^ button to scroll
from the present value to max then min and can be
selected by pushing the > button. After selection the menu
will return to the beginning of the same parameter change
menu. If no button is pressed for 10s the display reverts
back to normal mode. Table 5 shows the list of standard
parameters.
During the normal operation the current value of entering
water temperature is displayed flashing alternatively with
the current status. To display other useful data, go to
level l, use the ^ button to scroll the menu, and use the >
button to select the display value. The display data are
shown is Table 6.

Control System
For 3 phase unit, check the phase monitor.
If the green LED light is on, means that the phase connection is reverse, need to exchange
any two phase connection of three.
When the red LED light is on, the compressor can start up normally.
Table 5
Table 6
List of standard parameters
Display Meaning Min Value
COOL COOL
OPER
CSP
HSP
COAL
COAH
CDCO
HDCO
HOAL
HOAH
ND
NFC
ID
gly
HEAt
Max value Step Default value
Cooling/Heating mode selection
Cooling set-point temperature Min cooling setpoint
Heating set point
Glycol %
nigh Night mode configuration
Cooling set point temperature compensation low limit
Cooling set point temperature compensation high limit
Cooling set point temperature compensation cooling mode
Heating set point temperature compensation
Heating set point temperature compensation low limit
Heating set point temperature compensation high limit
Night mode differential
Night mode fan change
Identification address
Display Data
Level 1 Level 2 Level 3
UnIt
DE
PArA (Parameters)
CO or HP
Select to show present value Triac output value
in % from 0 to 100.
TO (triac output)
CSPT (cooling set point temperature)
HSPT (heating set point temperature)
tD (last deicing duration)
EWT (entering water temperature)
SEnS (Sensor)
LWT (leaving water temperature)
Select to show present value (if coonected)
CP (condensing pressure)
EP (evaporating pressure)
CPS (condensing saturated temperature)
EPS (evaporating saturated temperature)
OAT (outdoor air temperature)
OCT (outdoor coil temperature)
RT
ALAr(Existing faults) See alarm list below Scrolls through all active faults (if any)
HRS (Running hours)
Stat
Cl(compressor) xlO hrs Select to show hrs
tC 1 (compressor timer) hrs
Log (Alarm log) Same choice as a alarm list Scrolls through last 10 alarms in order
Cl (compressor) ON or OFF
ON or OFF
ON or OFF
ON or OFF
ON or OFF
rv(reversing valve)
TH (trace heater for frost protection)
Pump
OFAN (outdoor fan)
De-ice in operation
Mode
dEIC ( de-ice)
OFF of COOL or HEAt
English