RDZ UM 06 User manual

Chiller and Heat Pumps
UM / UM PLUS
Monoblock Units
INSTALLATION / TECHNICAL MANUAL
High-eciency air-to-water reversible heat pumps
9120487.01
12/2016
bit.ly/rdzwebsite

UM / UM PLUS Chillers and inverter air / water heat pumps with axial fans
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Monoblock Unit HP Inverter
UM 06-08-12-16
UM Plus 06-08-12-16
01 08-2015 A.B.
Rev Date Author Supervisor Notes
Possible wasted electrical or electronic devices/products should not be located together with normal domestic waste, but disposed according to the
current WEEE law in compliance with the European Directive 2012/19/UE. Please inform yourself at your local Administration or at your reseller in case
the product will be replaced with a similar one.

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INDEX
1AIM AND CONTENTS OF THE MANUAL ............................................................................................................... 5
1.1 HOW TO KEEP THIS MANUAL.................................................................................................................................5
1.2 GRAPHIC SYMBOLS ................................................................................................................................................5
2SAFETY LAWS ..................................................................................................................................................... 5
3PERMITTED USES ................................................................................................................................................ 5
4GENERAL SAFETY GUIDELINES ............................................................................................................................ 6
4.1 WORKERS’ HEALTH AND SAFETY............................................................................................................................6
4.2 PERSONAL SAFETY EQUIPMENTS...........................................................................................................................6
4.3 SAFETY SYMBOLS ...................................................................................................................................................6
4.4 REFRIGERANT SAFETY DATA SHEET .......................................................................................................................7
5TECHNICAL CHARACTERISTICS ............................................................................................................................ 8
5.1 FRAME ...................................................................................................................................................................8
5.2 REFRIGERANT CIRCUIT...........................................................................................................................................8
5.3 COMPRESSORS ......................................................................................................................................................8
5.4 AIR SIDE EXCHANGERS ...........................................................................................................................................8
5.5 FANS.......................................................................................................................................................................8
5.6 USER SIDE HEAT EXCHANGERS...............................................................................................................................8
5.7 ELECTRIC BOX.........................................................................................................................................................8
5.8 CONTROL SYSTEM..................................................................................................................................................8
5.9 MONITORING AND PROTECTION DEVICES.............................................................................................................9
5.10 HYDRAULIC CIRCUIT...............................................................................................................................................9
5.11 FAN SPEED CONTROL .............................................................................................................................................9
6AVAILABLE VERSIONS ......................................................................................................................................... 9
6.1 OPTIONAL ACCESSORIES........................................................................................................................................9
7INSTALLATION .................................................................................................................................................. 10
7.1 GENERALITY .........................................................................................................................................................10
7.2 LIFTING AND HANDLING ......................................................................................................................................10
7.3 LOCATION AND MINIMUM TECHNICAL CLEARANCES .........................................................................................10
7.4 HYDRAULIC CONNECTIONS..................................................................................................................................11
7.4.1 Drainage connection ....................................................................................................................................11
7.4.2 Plant circuit charging....................................................................................................................................11
7.4.3 Plant drainage system ..................................................................................................................................12
7.4.4 Hydraulic circuit............................................................................................................................................12
7.5 REFRIGERANT DIAGRAM OF UM/UM PLUS 06-08 ................................................................................................13
7.6 REFRIGERANT DIAGRAM OF UM/UM PLUS 12-16 ................................................................................................13
7.7 ELECTRICAL CONNECTIONS .................................................................................................................................13
7.7.1 Wiring terminal block ...................................................................................................................................14
7.7.2 Removal of protective carter for models 12 and 16 .....................................................................................16
8START UP.......................................................................................................................................................... 16
9SHUTDOWNS FOR LONG PERIODS .................................................................................................................... 17
10 MAINTENANCE AND PERIODICAL CONTROLS ................................................................................................ 17
10.1 ENVIRONMENTAL PROTECTION ..........................................................................................................................18
11 WHEN THE UNIT GOES OUT OF SERVICE ........................................................................................................ 18
12 TECHNICAL DATA .......................................................................................................................................... 19
13 ELECTRIC DATA OF THE UNIT AND AUXILIARIES............................................................................................. 20

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14 HEAT PUMPS AVAILABLE HEAD PRESSURE .................................................................................................... 20
14.1 MODELS UM /UM PLUS........................................................................................................................................20
15 WATER PUMP CURVES .................................................................................................................................. 21
15.1 MODELS UM /UM PLUS 06-08..............................................................................................................................21
15.2 MODELS UM /UM PLUS 12-16..............................................................................................................................22
16 PERFORMANCE ............................................................................................................................................. 23
16.1 MOD. UM /UM PLUS 06 .......................................................................................................................................23
16.2 MOD. UM /UM PLUS 08 .......................................................................................................................................25
16.3 MOD. UM /UM PLUS 12 .......................................................................................................................................27
16.4 MOD. UM /UM PLUS 16 .......................................................................................................................................29
17 OPERATING LIMITS........................................................................................................................................ 31
17.1 EVAPORATOR WATER FLOW RATE.......................................................................................................................31
17.2 COLD WATER TEMPERATURE (SUMMER OPERATION) ........................................................................................31
17.3 HOT WATER TEMPERATURE (WINTER OPERATION) ............................................................................................31
17.4 AMBIENT AIR TEMPERATURE ..............................................................................................................................31
18 CORRECTION FACTORS FOR USE OF GLYCOL.................................................................................................. 32
19 DIMENSIONS................................................................................................................................................. 33
19.1 MODELS UM /UM PLUS 06...................................................................................................................................33
19.2 MODELS UM /UM PLUS 08...................................................................................................................................33
19.3 MODELS UM /UM PLUS 12-16..............................................................................................................................34
20 WIRING DIAGRAMS....................................................................................................................................... 35
20.1 MODELS UM /UM PLUS 06-08..............................................................................................................................35
20.2 MODELS UM /UM PLUS 12...................................................................................................................................36
20.3 MODEL UM /UM PLUS 16.....................................................................................................................................37
21 REMOTE CONTROL (OPTIONAL ACCESSORY).................................................................................................. 38
21.1 CONNECTION OF THE REMOTE CONTROL TO THE MINICHILLER .........................................................................38
22 HYDRAULICS DIAGRAM TYPE ........................................................................................................................ 39
23 CONTROL LOGICS .......................................................................................................................................... 40

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The manual of UM / UM Plus units contains all the necessary information for the better use of the equipment under safety
conditions for the operator thus meeting the requirements listed in the 2006/42/CE Equipment Directive and following
amendments.
1AIM AND CONTENTS OF THE MANUAL
This manual provides basic information as for the installation, the operation and the maintenance of the UM / UM Plus units. It is
addressed to machine operators and it enables them to use the equipment efficiently, even if they do not have any previous
specific knowledge of it.
This manual describes the characteristics of the equipment at the time in which it is being put on the market; therefore, it may not
include technological improvements introduced later by the company as part of its constant endeavour to enhance the
performance, ergonomics, safety and functionality of its products.
The company, therefore, is not constrained to update the manuals for previous versions of machines.
It’s recommended that, the user must follow the instructions contained in this booklet, especially those concerning the safety and
routine maintenance.
1.1 HOW TO KEEP THIS MANUAL
The manual has to be always kept with the unit it refers to. It has to be stored in a safe place, away from the dust and moisture. It
has to be accessible to all users who shall consult it any time they are in doubt on how to operate the equipment.
The company reserves the right to modify its products and related manuals without necessarily updating previous versions of the
reference material. It declines also any responsibility for possible inaccuracies in the manual if due to printing or transcription
errors.
The customer shall store any updated copy of the manual or parts of it delivered by the manufacturer as an attachment to this
manual.
The company is available to give any detailed information about this manual and to give information regarding the use and the
maintenance of its own units.
1.2 GRAPHIC SYMBOLS
Indicates operations that can be dangerous for people and/or disrupts the correct operation of the equipment.
Indicates prohibited operations.
Indicates important information that the operator has to follow in order to guarantee the correct operation of the
equipment in complete safety.
2SAFETY LAWS
The UM / UM Plus units have been designed in compliance with the following Directives and Harmonised Norms:
•97/23/CE, 2014/35/UE, 2014/30/UE, 2011/65/UE, 2012/19/UE Community Directives
•UNI EN 378-1, 378-2, UNI EN 12735-1 Norms
•CEI EN 60335-2-40 Norms
•CEI EN 55014-1, CEI EN 55014-2, CEI EN 61000-3-2, CEI EN 61000-3-3, CEI EN 62233 Norms
3PERMITTED USES
•The company excludes any contractual and extra contractual liabilities for damages caused to persons, animals or objects, by
incorrect installation, setting and maintenance, improper use of the equipment, and the partial or superficial reading of the
information contained in this manual.
•These units have been designed only for heating and/or cooling water. Any other use not expressly authorized by the
manufacturer is considered improper and therefore not allowed.
•The location of the plant, the hydraulic and electrical circuits must be established by the planting designer and must take into
account both technical requirements as well as any applicable local laws and authorized specifications.
•The execution of all works must be performed by skilled and qualified personnel, competent in the existing rules in different
countries.

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4GENERAL SAFETY GUIDELINES
Before beginning to operate on UM / UM Plus units every user has to be perfectly knowledgeable about the functions of the
equipment and its controls and has to have read and understood the information listed in this manual.
It’s strictly forbidden to remove and
/
or tamper with any safety device.
Children or unassisted disabled persons are not allowed to use the appliance.
Do not touch the appliance when barefoot or parts of the body are wet or damp.
Do not clean the unit when the power is ‘ON’.
Do not pul
l
,
remove or twist the electrical cables coming out from the unit, even if it is disconnected from the main
power supply.
Do not step with your feet on the appliance, sit down and/or place any type of object.
Do not spray or pour water directly on the unit.
Do not dispose of, abandon or leave within reach of children packaging materials (cardboard, staples, plastic bags,
etc.) as they may represent a hazard.
Any routine or not-routine maintenance operation shall be carried out when the equipment has been shut down,
disconnected from electric power sources.
Do not put neither your hands nor insert screwdrivers, spanners or other tools into moving parts of the equipment.
The equipment supervisor and the maintenance man have to receive suitable training for the performance of their
tasks in safety.
Operators have to know how to use personal protective devices and have to know the accident-prevention guidelines
contained in national and international laws and norms.
4.1 WORKERS’ HEALTH AND SAFETY
The European Community has adopted a number of directives on workplace’s health and safety, which include 89/391/CEE,
89/686/CEE, 2009/104/CE, 86/188/CEE and 77/576/CEE directives. Every employer shall implement such provisions and ensure
that their workers to respect them. We observe therefore that
Do not tamper with or replace parts of the equipment without the specific consent of the manufacturer. The
manufacturer shall have no responsibility whatsoever in case of unauthorised operations.
Using components, expendable materials or spare parts that do not correspond to those recommended by the
manufacturer and/or listed in this manual may be dangerous for the operators and/or damage the equipment
The operator’s workplace has to be kept clean, tidy and free from objects that may prevent free movements.
Appropriate lighting of the work place shall be provided so as to allow the operator to carry out the required
operations safely. Poor or too strong lighting can cause risks.
Ensure that work places are always adequately ventilated and that aspirators are working, in good condition and in
compliance with the requirements of the laws in force.
4.2 PERSONAL SAFETY EQUIPMENTS
When operating and maintaining the UM / UM Plus units, use the following personal protective equipment.
Protective clothing: Maintenance men and operators have to wear protective clothing that complies with the basic
safety requirements currently in force. In case of slippery floors, users have to wear safety shoes with non-slip soles.
Gloves: During maintenance or cleaning operation protection gloves have to be used
Mask and goggles: Respiratory protection (mask) and eye protection (goggles) should be used during
cleaning and maintenance operations.
4.3 SAFETY SYMBOLS
The unit features the following safety signs, which has to be complied with:
General hazards
Electric shock hazard
Presence of moving organs
Presence of surfaces that may cause injures
Presence of hot surfaces that can cause burns

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4.4 REFRIGERANT SAFETY DATA SHEET
Name: R410A (50% Difluoromethane (R32); 50% Pentafluoroethane (R125).
RISKS INDICATIONS
Major risks: Asphyxia
Specific risks: The rapid evaporation may cause freezing.
FIRST AID
General information: Never give anything by mouth to an unconscious person.
Inhalation: Move to fresh air.
Oxygen or artificial respiration if necessary.
Do not administer adrenaline or similar drugs.
Eyes contact: Rinse carefully with water for at least 15 minutes and consult a doctor.
Contact with skin: Wash immediately with plenty of water.
Take off immediately the contaminated clothing.
FIRE PREVENTION
Extinguishing Media: Whatever.
Specific risks: Increase in pressure.
Specific methods: Use water spray to cool containers
ACCIDENTAL RELEASE ACTIONS
Personal precautions: Evacuate personnel to safe areas.
Provide adequate ventilation.
Use personal protective equipment.
Environmental precautions: Evaporate.
Cleaning method: Evaporate.
HANDLING AND STORAGE
Manipulation
Action/technical precautions: Provide sufficient air exchange and/or suction in work places.
Recommendations for safe use: Do not breathe vapors or aerosol.
Storage: Close tightly and store in a cool, dry and well ventilated place.
Store in original container. Incompatible products: explosive, flammable materials, Organic peroxide
EXPOSURE CONTROL / PERSONAL PROTECTION
Control parameters: AEL (8-h e 12-h TWA) = 1000ml/m³ for each of the two components.
Respiratory protection: For rescue and maintenance operation in storage tanks use self-contained respirator apparatus.
The vapors are heavier than air and can cause suffocation by reducing oxygen available for breathing.
Eyes protection: Safety glasses.
Protection of hands: Rubber gloves.
Hygiene measures: Do not smoke.
PHYSICAL AND CHEMICAL PROPERTIES
Colour: Colourless.
Odor: Light.
Boiling point: -52.8°C at atmospheric pressure.
Lighting point: It does not ignite.
Density: 1.08kg/l at 25°C.
Solubility in water: Negligible.
STABILITY AND REACTIVITY
Stability: No reactivity when used with the appropriate instructions.
Materials to avoid: Highly oxidizing materials. Incompatible with magnesium, zinc, sodium, potassium and aluminum.
The incompatibility is more serious if the metal is present in powdered form or if the surfaces were, recently,
unprotected.
Decomposition products These products are halogenated compounds, hydrogen fluoride, carbon oxides (CO, CO2), carbonyl halides.
Risks:
TOXICOLOGICAL INFORMATION
Acute toxicity: (R32) LC50/ inhalation /4 hours/on rat >760 ml/l
(R125) LC50/ inhalation /4 hours/on rat >3480 mg/l
Local effects: Concentrations substantially above the TLV may cause narcotic effects.
Inhalation of decomposed products of high concentrations may cause respiratory failure (pulmonary edema).
Long term toxicity: Did not show carcinogenic, teratogenic or mutagenic effects in animal experiments.
ECOLOGICAL INFORMATION
Global warming potential 1730
GWP (R11=1):
Potential depletion 0
Ozone ODP (R11=1):
Disposal considerations: usable with reconditioning.

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5TECHNICAL CHARACTERISTICS
The UM / UM Plus water chillers and heat pumps series are designed for applications in residential and commercial areas, These
units are extremely versatile and can operate in heat pump mode with the ability of producing hot water at a temperature of 58°C
for environmental heating and sanitary applications. The INVERTER compressor with brushless DC motor technology, matched
with electronic expansion valve, pump and variable speed blower are generally used for optimizing the power consumption and
efficient operation of the refrigerating components.
5.1 FRAME
All UM / UM Plus units are made up of hot-galvanised thick sheet metal, painted with polyurethane powder enamels at 180°C to
ensure the best resistance against atmospheric agents. The frame is self-supporting with removable panels. All screws and rivets
for outdoor installations are in galvanized steel.
5.2 REFRIGERANT CIRCUIT
The refrigerant gas used in these units is R410A. The refrigerant circuit has been manufactured by means of international primary
brands components and according to the UNI EN 13134 Rule concerning welding procedures. The refrigerant circuit includes: 4
way reverse cycle valve, electronic expansion valve, liquid separator (models 09, 12 and 15), liquid receiver, valves for
maintenance and control, pressure safety device according to PED regulation, pressure transducers to accurately adjust the
evaporating and condensing pressures, filters for throttling valve to avoid its clogging.
5.3 COMPRESSORS
The used DC inverter compressors are a rotary hermetic type (for 06 model) and twin rotary (for 06,12 and 15 models) designed to
be used with R410 refrigerant. The compressors are all supplied with crankcase heater and thermal overload protection. They are
mounted on a rubber material acting as a shock absorber.
The compressors are mounted in a separate chamber in order to be separated from the air stream to reduce the noise. The
crankcase heater operates when the compressor remains off for at least 30 minutes and if the discharge temperature is below
20°C (with hysteresis of 2.0°C). When the compressor restarts, the crankcase heater will stop operation. We recommend to turn
on the unit and to put it in standby mode at least 6 hours before the first start-up.
The checking of the compressors is possible through the frontal panel of the unit that allow the maintenance of the compressors
even if the unit is working.
5.4 AIR SIDE EXCHANGERS
The air side exchangers are made up of copper pipes and aluminium fins. The diameter of the copper pipes is 7mm for the model
09 and 5/16” for the other models 12 and 15, the thickness of the aluminium fins is 0,1mm. The tubes are mechanically expanded
into the aluminium fins to improve the heat exchange factor. The geometry of these condensers guarantee a low air side pressure
drop and, then, the use of low rotation (and low noise emission) fans.
5.5 FANS
The fans are axial type with aluminium aerofoil blades. They are statically and dynamically balanced and supplied complete of the
safety fan guard according to the CEI EN 60335-2-80 Rule (safety for electrical apparatus of domestic and similar use). They are
mounted on the unit frame by interposition of rubber vibration dampers. The electric motors are all brushless DC type with 8
poles (about 200/1000 rpm). The motors are directly driven with an integrated thermal overload protection. The protection class
of the motors is IP X4.
5.6 USER SIDE HEAT EXCHANGERS
The user side heat exchangers are made up of AISI 304 stainless steel braze-welded plates type. The user heat exchangers are
factory insulated with flexible close cell material and can be equipped with antifreeze heater (KA optional). Each heat exchanger is
provided with a temperature sensor working as antifreeze protection that activates the circulator, even in the case when the unit
is turned off when the conditions set in the controller have been occurred.
5.7 ELECTRIC BOX
The electric box is manufactured according to the current European Union laws. The accessibility to the board is possible after
removing the front, side and top panels of the unit using proper tools. The protection degree is IP24. The terminal board is
supplied with voltage free contacts for remote ON-OFF, winter/summer change over, auxiliary heater, sanitary water temperature
sensor control of external 3-way valve and free contacts for remote control panel and for the management of the dual set point of
operation.
5.8 CONTROL SYSTEM
All UM / UM Plus units are standard supplied with a microprocessor adopting an overheating control logic program through the
electronic expansion valve which is driven by the pressure transducers signals. The microprocessor is also capable of controlling
the following functions: water temperature regulation, antifreeze protection, compressors’ time setting, compressor automatic
starting sequence, alarm reset, alarm management and operating LED. Upon request, the microprocessor can be connected to a
BMS remote control system and to the simpler HNS system with our terminal units. The control system together with the
INVERTER technology and the on board sensors continuously monitor and adapt the performance of the inverter compressor, of

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the pump and of the fan (2 fans on models 12 and 16) according to the value of cooling power at any working conditions
requested by the user.
The INVERTER system allows to reduce the plant’s water content to the minimum, that is from the usual value 12-16 l/kW to 18
liters for the 06 model or to 25 liters (for the 08 model) or to 35 liters for the 12 model and to 45 liters for the model 16, in
ABSOLUTE, of the UM / UM Plus units. Because of the reduced water content, the UM / UM Plus units can be also installed in
plants without water tank with advantages in terms of the appliance’s reduced size, the installation space, heat loss and
installation and maintenance costs.
5.9 MONITORING AND PROTECTION DEVICES
All units are standard supplied with the following monitoring and protection devices: return water temperature sensor installed at
the return water pipe line from the plant, operating and antifreeze sensor installed at the outlet pipe of the water to the plant,
high pressure transducer, low pressure transducer, compressor’s inlet and outlet temperature sensors, compressors thermal
protection device, fans thermal protection device, water side installed water flow switch to protect the evaporator, high pressure
HP flow switch.
CAUTION: The INVERTER control system is able to manage in the plant the minimum water contents up to a value
of 18 liters for the 06 model, of 25 liters for the 08 model, of 35 liters for the 12 model, and of 45 liters for the 16
model. This value makes reference to the liters absolute value and not to any kW of installed power.
5.10 HYDRAULIC CIRCUIT
The UM / UM Plus chillers units are supplied with an integrated hydraulic circuit including: circulating pump with high efficiency
DC brushless motor (EEI≤0,23), suitable for chilled water utilization and directly run by a controller on board, plate heat exchanger,
expansion vessel (2 liters), safety valve (6 bar) that have to be connected with a colleting tank, the automatic air release valve and
the flow switch. In the case of V2+ series, there is also a 4-way valve for reversing the flow of the heat exchanger, allowing the
optimization of the yield even in evaporation.
5.11 FAN SPEED CONTROL
This type of control is managed by the microprocessor and is necessary for optimizing the pressure of evaporation/condensation
during summer/winter operation in order to allow proper running of the unit.
6AVAILABLE VERSIONS
UM 06-08-12-16 reversible heat pump with integrated hydronic system (expansion vessel, safety valve, pressure gauge,
modulating pump, flow switch, automatic air release valve, load/unload valve).
UM 06-08-12-16 Plus reversible heat pump with integrated hydronic system (expansion vessel, safety valve, pressure gauge,
modulating pump, flow switch, automatic air release valve, load/unload valve), with antifreezing kit.
Antifreezing kit is made up of an auto-heating cable that wrapped around the base of the unit near the condensing coil and two
PET heaters installed on the sides of the plate heat exchanger.
6.1 OPTIONAL ACCESSORIES
-Remote control panel to be installed in the room for the unit remote controlling, with additional functions in comparison to
the one installed on board; it can also run our hydronic terminal units.
-Anti-vibration rubber pad to be installed in the chassis of the unit for possible shock absorption.
-1” Y Filter
-Sanitary sensor
-1” DHW Diverter valve
-Kit DPI

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7INSTALLATION
WARNING: All the operation described in next chapters MUST BE DONE BY TRAINED PEOPLE ONLY. Before any
operation on the unit, be sure that the electric supply is disconnected.
7.1 GENERALITY
When installing or servicing the unit, it is necessary to strictly follow the rules listed in this manual, to conform to all the
specifications of the labels on the unit, and to take any possible precautions. Not observing the rules reported on this manual can
create dangerous situations.
After receiving the unit, immediately check its integrity. The unit left the factory in perfect condition; any eventual
damage has to be questioned to the carrier and recorded on the Delivery Note before signing it.
The company has to be informed, within 8 days, of the extent of the damage. The Customer should prepare a written statement of
any severe damage.
WARNING: The units are designed for outdoor installation. The place of installation must be entirely far away from
fire risk. All the necessary measures should be adopted in order to prevent the fire risk in the place of installation. The
outdoor ambient temperature shall not exceed 46°C. Above this value, the unit is no longer covered by the directives
in force in the area of pressure equipment.
WARNING: The unit should be installed so that adequate clearance is available for maintenance and repairation. The
warranty does not cover costs related to platforms or handling equipment necessary for any maintenance.
All maintenance and testing operations should be carried out only by QUALIFIED PERSONNEL.
Before any operation on the unit, make sure the power supply is disconnected.
WARNING: MOVING PARTS, RISK OF DEATH.
Disconnect the power supply and ensure that the fan is stopped before opening the front panel.
The temperatures of heads and discharge piping of the compressor are usually high.
Be careful when working near condensing coils.
The aluminum fins are very sharp and can cause serious injuries.
After the maintenance operations, close the panels tightly with the fastening screws.
7.2 LIFTING AND HANDLING
When unloading and installing the unit, it is highly recommended to
avoid any sudden move in order to protect the inner components.
Units can be lifted by means of a forklift or, in alternative, of belts,
being sure not to damage the lateral panels and the cover. It is
important to keep the unit horizontal during these operations.
7.3 LOCATION AND MINIMUM TECHNICAL CLEARANCES
The all UM / UM Plus units are designed for outdoor installation: any cover over the unit and location near trees (even if they
partially cover the unit) has to be avoided in order to prevent air recirculation. It is advisable to create a proper basement, with a
size similar to unit foot-print. Unit vibration level is very low: it is advisable however, to fit a rigid rubber band between basement
and unit base-frame. It is also possible to install anti-vibration supports (springs or rubbers) to keep vibrations at a very low level.
Absolute care has to be taken to ensure adequate air volume to the condenser. Re-circulation of discharge air has to be avoided;
failure to observe this point will result in poor performance or activation of safety controls. For these reasons it is necessary to
observe the following clearances:

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Models A B* C DE**
UM / UM Plus 06 1500 500 400 400 500
UM / UM Plus 08 1500 500 400 400 500
UM / UM Plus 12 1500 500 400 400 500
UM / UM Plus 16 1500 500 400 400 500
* The recommended minimum distance for installation and maintenance.
** The recommended minimum distance for assistance and maintenance
7.4 HYDRAULIC CONNECTIONS
The hydraulic connections have to be installed in accordance with national and local regulations; pipes can be made up of steel,
galvanized steel or PVC. Pipes have to be designed depending on the nominal water flow and on the hydraulic pressure drops of
the system. All pipes have to be insulated with closed-cell material of adequate thickness. Chillers have to be connected to piping
by means of flexible joints. Piping should include:
• Hole thermometers to monitor the system’s temperature.
• Manual gate valves to separate the chiller from the hydraulic circuit.
• Y-shaped metallic filter (to be mounted on the inlet pipe) with a mesh not larger than 1mm.
• Charging group and discharge valve, where necessary.
WARNING: Make sure that, when designing the pipe length and diameter
,
do not exceed the maximum hea
d
loss
on the plant side, please see the technical data given in the table of Paragraph 12 (available pressure head).
WARNING: Connect the pipes to the attacks by using always key against key system.
WARNING: The expansion vessel have a limited volume. The installator have to provide a further expansion vessel
if it is necessary.
WARNING: Unit water inlet pipe have to be in correspondence with the connection labelled: ”WATER INLET”,
otherwise the evaporator may freeze.
WARNING: It is compulsory to install on the WATER INLET connection a metallic filter with a mesh not larger than
1mm. Should the water flow switch be altered or should the filter not be installed, the warranty will no longer be
valid. The filter have to be kept clean, so make sure it is clean after the unit has been installed, and then check it
periodically.
All units are standard supplied with the water flow switch (factory installed). Should the water flow switch be
altered, removed, or should the water filter not be installed on the unit, the warranty will be invalidated. Please
refer to the wiring diagram for the water flow switch electric connections.
7.4.1 Drainage connection
All UM / UM Plus units have been designed to use their own base as a drain pan; a plastic pipe fitting is standard provided to be
installed onto the lower part of the unit in the special housing enabling the connection of a drainage pipe.
Each unit is also provided, on the basement of the hydronic kit (accessible from the right sides panels), with a hole that can allow
to drain any condensation that may escape from plumbing pipes. As well as the pipes are well-insulated, the production of
condensate is however very low and therefore the connection of a drainage pipe to that hole is not required.
7.4.2 Plant circuit charging
WARNING: Verify all the charging/topping up operations.
WARNING: Before beginning the charging
/
topping up operation of the plant circuit, disconnect the unit for the
electric power supply.
WARNING: The charging
/
topping up of the plant circuit must always be done under controlled conditions of
pressure (max 1 bar). Make sure that you have installed on the line of charging/topping up a pressure
reducerdevice and a relief valve.
WARNING: The water on the charging
/
topping up pipe must be suitably pre-filtered from any impurities and
suspended particles. Make sure that you have installed a cartridge filter removable.
WARNING: Before beginning the charging /topping up operation, unscrew the plug of the air vent valve. Tighten
the plug after finishing the operation of charging/topping up of the plant circuit system.
Drainage pipe fitting Drainage pipe fitting housing Drainage pipe fitting connected to the unit

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7.4.3 Plant drainage system
When it is necessary to drain the plant, close at first the inlet and outlet manual gate valves (not supplied) and then remove the
pipes that are disposed externally on the water inlet and on the water outlet in order to spill away the liquid contained in the unit
(for easier operation, it is recommended to install externally two draining valves, on the water inlet and on the water outlet,
between the unit and the manual gate valves).
7.4.4 Hydraulic circuit
Models: UM / UM Plus
A
B
H
F
G
E
D
C
KEY
A Plate heat exchanger F Air vent valve
B Water flow switch G
Safety valve
C Service valve H
Pressure gauge
D Pump with DC brushless motor
E Expansion vessel
During the operations of charging/topping up, the plugs of the air vent valves must
be partially unscrewed to allow air to flow freely out of the valves.
(1) Plug of the air vent valve
You can use the service valve, when it is necessary to refill the plant or adapt the
concentration of glycol. Unscrew the cap of the service valve and connect to the
hose a pipe of 14 mm (inner diameter) connected to the water network, and then
load the system by unscrewing the knurled nut. When the operation is concluded,
retighten the knurled nut and screw on the cap. In any case, we recommend you to
use for the water loading of the plant an external tap whose arrangement is by the
installer.
Cap with gasket
Knurled nut
1

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7.5 REFRIGERANT DIAGRAM OF UM/UM Plus 06-08
SE
EEV
LR
IN OUT
4WV
DT
LP HP
ST
M
P
C
LS
FL FL
CLS
Pr
CCOMPRESSOR
CLS COMPRESSOR LIQUID SEPARATOR
ST COMPRESSOR INLET TEMPERATURE
DT COMPRESSOR OUTLET TEMPERATURE
HP HIGH PRESSURE TRANSDUCER
Pr HIGH PRESSURE FLOW SWITCH
LP LOW PRESSURE TRANSDUCER
LS LIQUID SEPARATOR (only for model 09)
4WV VALVE FO INVERTING CYCLE
LR LIQUID RECEIVER
EEV ELECTRONIC EXPANSION VALVE
FL FILTER
MAXIAL FAN
SE OUTDOOR AIR TEMPERATURE
PCIRCULATOR ON BOARD UNIT
IN WATER INLET TEMPERATURE
OUT WATER OUTLET TEMPERATURE
7.6 REFRIGERANT DIAGRAM OF UM/UM Plus 12-16
SE
EEV
LR
IN OUT
4WV
DT
LP HP
ST
M
P
C
LS
OS
FL FL
NRV
CP
CLS
Pr
CCOMPRESSOR
CLS COMPRESSOR LIQUID SEPARATOR
OS OIL SEPARATOR
ST COMPRESSOR INLET TEMPERATURE
DT COMPRESSOR OUTLET TEMPERATURE
HP HIGH PRESSURE TRANSDUCER
Pr HIGH PRESSURE FLOW SWITCH
LP LOW PRESSURE TRANSDUCER
LS LIQUID SEPARATOR
4WV VALVE FO INVERTING CYCLE
LR LIQUID RECEIVER
EEV ELECTRONIC EXPANSION VALVE
NRV NO RETURN VALVE
FL FILTER
MAXIAL FAN
SE OUTDOOR AIR TEMPERATURE
PCIRCULATOR ON BOARD UNIT
IN WATER INLET TEMPERATURE
OUT WATER OUTLET TEMPERATURE
CP CAPILLARY
7.7 ELECTRICAL CONNECTIONS
Check out that the power supply meets the unit’s electric nominal data (tension, phases, frequency) reported on the label in the
unit’s right-side panel. Power connections have to be made in accordance to the wiring diagram enclosed with the unit and in
conformity with the national and international norms in force (providing equipment as general magnetothermic circuit breaker,
differential circuit breakers for each electric line, proper grounding for the plant, etc.). Power cables, electric protections and line
fuses have to be sized according to the specifications listed in the wiring diagram enclosed with the unit and in the electrical data
contained in the table of technical characteristics (see Paragraph 12).
WARNING: Installer has to provide a general circuit breaker (for example a magnetothermic circuit breaker) at the
beginning of unit circuit system.
WARNING: The supply voltage’s fluctuations cannot exceed ±10% of the nomina
l
value. Should this tolerance not be
respected, please contact our technical department.
WARNING: The power supply have to respect the listed limits: failing this, warranty will terminate immediately.
Before any operation on the unit, be sure that the power supply is disconnected.
WARNING: The water flow switch (B component in the previous hydraulic circuit and factory installed) have ALWAYS
to be connected following the indications listed in the wiring diagram. Never bridge the water flow switch
connections in the terminal board. Should the water flow switch connections altered or not properly made, the
guarantee will be invalidated.
WARNING: The remote control panel is connected to the water chiller by means of no.4 wires having a 1,5 mm2
section. The power supply cables have to be separated from the remote control wires. The maximum distance is 50m.
WARNING: The remote control panel cannot be installed in areas with strong vibrations, corrosive gases, and excess
of dirtiness or high humidity levels. Leave free the area near the cooling openings.

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7.7.1 Wiring terminal block
Electrical wiring have to be done only by qualified personnel.
The electrical connections have to be realized by qualified personnel. The terminal block is located under the plastic cover on the
side of the hydraulic connections (for the models 12 and 16, it is necessary to remove the protective carter). The wiring to the
terminal block has to be realized in accordance to the below notes (the drawing is for illustration).
The connections indicated below are standard. Other connections are shown in the manual of the on board control of the
minichiller UM / UM Plus (see "TABLE OF CONFIGURATIONS ALLOWED TO USER AND INSTALLER"), depending on the configurations
adopted.
Terminal Type Connection
GND Power supply
1-Ph/N/PE
230V, 50Hz
(3-Ph/N/PE
400 Vac, 50Hz for the model of 15kW)
Connect the grounding wire
N1 Power supply
1-Ph/N/PE
230V, 50Hz
(3-Ph/N/PE
400 Vac, 50Hz for the model of 15kW)
Connect the power supply neutral wire;
L1 Power supply
1-Ph/N/PE
230V, 50Hz
(3-Ph/N/PE
400 Vac, 50Hz for the model of 15kW)
Connect the power supply phase wire; (note that, in the three-phases
versions there are two other terminals, L2 and L3)
NC1 Digital output
230 Vac with changeover contact
Power supply NC terminal (230V AC) for 3-way valve for sanitary hot water
boiler (used only for 3-way valve with 3 contacts for power supply
connection to switching-over to the plant side)
N Digital output
230 Vac with changeover contact
Power supply neutral terminal (230V AC) for 3-way valve for sanitary hot
water boiler.
NO1 Digital output
230 Vac with changeover contact
Power supply NO terminal (230V AC) for 3-way valve for sanitary hot wate
r
boiler (to switch-over the valve to the boiler side).
NC2 Digital output
230 Vac with changeover contact
Power supply NC terminal (230V, 50Hz, 5A resistive, 1 A inductive) for 3-
way dual set point valve for radiant panels.
N2 Digital output
230 Vac with changeover contact
Power supply neutral terminal (230V AC) for 3-way dual set point valve for
radiant panels.
NO2 Digital output
230 Vac with changeover contact
Power supply NO terminal (230V, 50Hz, 5A resistive, 1 A inductive) 3-way
valve dual set point for radiant panels.
R+ Serial communication Modbus + signal connection to remote control
R- Serial communication Modbus - signal connection to remote control
GNDR Serial communication connection to modbus ground for remote control
12V+ Power supply output 12Vac, 50Hz Power output for remote control (12V, 50Hz, 500mA)
12V- Power supply output 12Vac, 50Hz Power output for remote control (12V, 50Hz, 500mA)
SE Analogue (ST8)/digital (DI7) input Humidistat terminal for the dual set-point regulation (optional)
SE Analogue (ST8)/digital (DI7) input Humidistat terminal for the dual set-point regulation (optional)
AEHN Digital output (DO3) 230 Vac Neutral output of auxiliary electric heater for plant water (230V, 50Hz, 5A)
AEH Digital output (DO3) 230 Vac Phase output of auxiliary electric heater for plant water (230V, 50Hz, 5A)
SAN Analogue (ST9)/digital (DI8) input Sanitary water boiler sensor terminal

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SAN Analogue (ST9)/digital (DI8) input Sanitary water boiler sensor terminal
DO5N Digital output (DO5) 230 Vac Neutral output (for other configuration)
DO5 Digital output (DO5) 230 Vac Phase output (for other configuration)
DO4N Digital output (DO4) 230 Vac Neutral output (230V, 50Hz, 5A resistive, 1 A inductive) (optional to be
used only on UM unit, without antifreeze kit)
DO4 Digital output (DO4) 230 Vac Phase output (230V, 50Hz, 5A resistive, 1 A inductive) (optional to be used
only on UM unit, without antifreeze kit)
SW Digital input Summer/winter switching mode terminal via remote control (closed =
summer/open = winter);
SW Digital input Summer/winter switching mode terminal via remote control (closed =
summer/open = winter)
onoff Digital input Remote on-off terminal (closed = unit ON/open = unit OFF)
onoff Digital input Remote on-off terminal (closed = unit ON/open = unit OFF)
0-10V+ Analogue input (ST10) Input signal 0-10V (+) for set point adjustment
0-10V- Analogue input (S
T
10) Input signal 0-10V (-) for set point adjustment

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7.7.2 Removal of protective carter for models 12 and 16
The following shows the procedure for removing the protective carter so you can access the terminal block in models 12 and 16.
1)Remove the indicated screws
2) Push down the right side panel
3) Turn the right side panel in the
direction indicated by the arrow to
remove it.
In order to reposition and fix the carter, repeat the procedure on the contrary.
8START UP
Before start-up:
•Check out the availability of the supplied wiring diagrams and manuals of installed apparatus.
•Check out the availability of the electrical and hydraulic diagrams of the plant in which the unit is installed.
•Check that the shut-off valves of the hydraulic circuits are open.
•Verify that the hydraulic circuit has been charged under pressure and air vented.
•Check out that all water connections are properly installed and all indications on unit labels are observed.
•Ensure that arrangements have been provided to drain the condensate.
•Check out that all power cables are properly connected and all terminals are hardly fixed.
•Check that electrical connections are carried out according to the norms in force including grounding.
•Check out that the voltage is the one shown in the unit labels.
•Make sure the voltage is within the limits (±10%) of tolerance range.
•Check out that crankcase heaters are powered correctly.
•Check out that there is no refrigerant leakage.
•Check out that all the cover panels are installed in the proper position and locked with fastening screws before start up.
WARNING: The unit must be connected to the electrical network and should be in STAND-BY mode (powered) closing
the general switch in order to operate the crankcase heaters of the compressor for a minimum of 12 hours before
start up. (the heaters are automatically powered when the main switch is switched off). The crankcase heaters are
working properly if, after some minutes, the temperature of crankcase’s compressor is about 10°C ÷ 15°C higher than
ambient temperature.
WARNING: The weight of the pipes doesn’t load unit structure.
WARNING: Never switch off the unit (for a temporary stop) by switching off the main switch: this component should
be used to disconnect the unit from the power supply only for lengthy stoppages (e.g. seasonal stoppages). Besides,
failing the power supply, the crankcase’s heaters are not supplied thus resulting in a possible breakdown of the
compressors once the unit is switched on.
WARNING: Do not modify the internal wiring of the unit otherwise the warranty will terminate immediately.
WARNING: The summer/winter operating mode have to be selected at the beginning of the related season. Frequent
and sudden changes of this seasonal operating mode have to be avoided in order to prevent severe damages to
compressors.
WARNING: When you first install and start-up the unit make sure that the unit is working properly in both cooling
and heating modes.

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9SHUTDOWNS FOR LONG PERIODS
The types of shutdown depends on the weather of the site where the unit is installed and on the period of the stop. The antifreeze
system, if it’s installed, stay on work also with the on-board control unit in “OFF” position.
If the time of stop is long and the temperature is low, we recommend to drain the hydraulic circuits or use a mixture of water and
glycol.
Drain the hydraulic circuits and shutdown the unit with this passage:
•Turn off the unit by placing the switch of each unit to "OFF" position.
•Close the water valves.
•Place the general differential circuit breaker to "OFF" position, if it is installed.
If the temperature drops below 0°C there is serious danger of frost: add a mixture of water and glycol in the
plant, otherwise drain the hydraulic circuits of the plant and of the heat pump.
WARNING: the operation, although it was transient, with water temperatures below +5°C is not guaranteed on
the basis of the limits set out in Paragraph 17.4. Before you turn the unit on after a long off period, make sure
that the temperature of the mixture of water and glycol is higher than or at least equal to + 5°C.
10 MAINTENANCE AND PERIODICAL CONTROLS
WARNING: All the operations described in this chapter HAVE TO BE CARRIED OUT BY TRAINED STAFF ONLY.
Before any operation or before entering the inner components of the unit, be sure that the power supply is
disconnected. The compressor’s heads and discharge piping are usually at high temperature levels. Be very
careful when operating in their surroundings. Aluminium coil fins are very sharp and can cause serious wounds.
Be very careful when operating in their surroundings. After maintenance operations, re-install the cover panels,
and fix them by means of screws.
The refrigerant circuits must not be filled with different gas other than that indicated on the nameplate. The use
of a different refrigerant can cause severe damage to the compressor.
It’s forbidden to use oils other than those specified in this manual. The use of a different oil can cause serious
damage to the compressor.
The temperatures of heads and discharge piping of the compressor are usually high.
Be careful when working near condensing coils.
The aluminum fins are very sharp and can cause serious injuries.
After the maintenance operations, close the panels tightly with the fastening screws.
It is a good rule to carry out periodic checks in order to verify the proper operation of the unit.
OPERATION 1 month 4 month 6 month
Filling the water circuit. x
Presence of bubbles in the water circuit. x
Check out that safety and control devices work correctly. x
Check out possible oil leakage from compressor. x
Check out possible water leakages from the hydraulic circuit. x
Check out the proper working of the flow switches. x
Check out that the crankcase electric heaters are properly supplied and functioning. x
Clean the metallic filters of the hydraulic circuit. x
Clean the finned coil by means of compressed air or water jet. x
Check out that all the terminals on the electric board as well as on the terminals of the compressor are
properly fixed. x
Tightening of water connections. x
Check out the tightening and the balancing of the fan blades. x
Correct voltage. x
Correct absorption. x
Check the refrigerant charge. x
Check the operating pressure, and superheat and subcooling. x
Check of the efficiency of circulation pump. x
Check the expansion tank. x
If the unit should be out of service for a long period, discharge water from the piping and from heat
exchanger. This operation is necessary if, during seasonal stoppages, ambient temperature is expected to
go down below the freezing point of the employed fluid.
x

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10.1 ENVIRONMENTAL PROTECTION
According to the norms dealing with the use of depleting stratospheric ozone substances, it is forbidden to release refrigerants
fluids in the atmosphere. They have to be collected and delivered to the seller or to proper gathering points at the end of their
operating life. Refrigerant R410A is mentioned among controlled substances and for this reason it has to be subjected to the
mentioned norms. A particular care is recommended during service operations in order to reduce as much as possible any
refrigerant loss.
11 WHEN THE UNIT GOES OUT OF SERVICE
Once the unit is arrived at the end of its life cycle and needs to be removed or replaced, the following operations are
recommended:
• the refrigerant has to be recovered by trained people and sent to proper collecting centre;
• compressors’ lubricating oil has to be collected and sent to proper collecting centre;
• the frame and the various components, if not serviceable any longer, have to be dismantled and divided according to their
nature, particularly copper and aluminium, which are present in conspicuous quantity in the unit. These operations allow easy
material recover and recycling process, thus reducing the environmental impact.

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12 TECHNICAL DATA
TECHNICAL CHARACTERISTICS Unit UM / UM Plus Model
06 08 12 16
Electric data
Power supply V/Ph/Hz 230V/1/50Hz 230V/1/50Hz 230V/1/50Hz 400V/3P+N+T/50Hz
Total power input kW 2,76 4,55 5,67 7,85
Maximum starting current A 7,8 12,9 16,1 7,3
Maximum current input A 12,1 20,0 24,9 11,3
Cooling
Cooling capacity (1) kW 2.46 - 5.09 5.57* 4.42 - 8.31 8.91* 4.88 - 11.57 12.44* 6.48 - 13.17 14.73*
Power input (1) kW 1,27 2,20 2,88 3,44
E.E.R. (1) W/W 4,02 3,78 4,01 3,83
Cooling capacity (2) kW 1.77 - 3.92 4.41* 3.21 - 6.14 7.57* 3.50 - 7.76 10.10* 4.58 - 9.92 12.10*
Power input (2) kW 1,28 2,06 2,60 3,37
E.E.R. (2) W/W 3,07 2,97 2,98 2,94
ESEER (5) W/W 6,20 5,78 6,15 5,98
Heating
Heating capacity (3) kW 2.60 - 5.77 - 6.20* 4.72 - 9.06 - 9.90* 5.09 - 12.40 - 13.19* 6.62 - 14.16 - 15.82*
Power input (3) kW 1.39 2.21 2.95 3.45
C.O.P. (3) W/W 4.15 4.11 4.21 4.11
Heating capacity (4) kW 2.46 - 5.46 - 5.78* 4.48 - 8.80 - 9.28* 4.81 - 11.66 - 12.43* 6.21 - 13.75 - 14.50*
Power input (4) kW 1.63 2.67 3.41 4.25
C.O.P. (4) W/W 3.34 3.30 3.42 3.24
SCOP (6) W/W 3.84 3.83 3.84 3.83
Compressor
Type Single Rotary
DC Inverter
Twin Rotary
DC Inverter
Twin Rotary
DC inverter
Twin Rotary
DC inverter
Number 1 1 1 1
Power input in cooling mode (1) kW 1,20 2,04 2,66 3,12
Power input in cooling mode (2) kW 1,20 1,91 2,38 3,06
Power input in heating mode (3) kW 1,24 2,01 2,72 3,10
Power input in heating mode (4) kW 1,48 2,47 3,18 3,89
Refrigerant oil (type, quantity) mL ESTER OIL VG74, 480 ESTER OIL VG74, 820 FV50S, 1070 FV50S/1400
Fan motor
Type Motore DC Brushless Motore DC Brushless Motore DC Brushless Motore DC Brushless
Number 1 1 2 2
Rated power input kW 0,156 0,188 0,144 (×2) 0,180 (×2)
Rated current input A 0,68 0,82 0,63 (×2) 0,79 (×2)
Speed r/min 900 900 800 1000
Max. air flow m3/s 1,08 1,63 2,11 2,59
Refrigerant
Type R410A R410A R410A R410A
Refrigerant quantity kg 1,55 2,10 3,65 3,90
Design pressure (high/low) MPa 4,2/2,7 4,2/2,7 4,2/2,7 4,2/2,7
Hydraulic
circuit
Water flow rate (3) m3/h 0,99 1,56 2,13 2,44
Available head pressure (3) kPa 56,4 33,4 46,2 38,0
Rated power input of the water pump (3) kW 0,063 0,063 0,087 0,087
Max power input of the water pump kW 0,063 0,063 0,087 0,087
Max. current input of the water pump A 0,47 0,47 0,71 0,71
Energy Efficiency Index (EEI) ≤0.23 ≤0.23 ≤0.23 ≤0.23
Expansion vessel L 2 2 2 2
Hydraulic connections inch 1”M 1”M 1”M 1”M
Minimum volume of water L 18 25 35 45
Noise level Sound pressure (7) dB(A) 44÷50 45÷53 46÷54 46÷54
Dimensions
and weight
Dimensions (L×H×W) mm 1134x719x373 1229x861x368 1258×1402×448 1258×1402×448
Max. Packing dimensions (L×H×W) mm 1310x850x430 1310x1000x430 1430x1546x690 1430x1546x690
Operating weight kg 73 92 147 152
Net/Gross weight kg 69/77 87/96 140/153 145/158
Operating conditions:
(1) Cooling: Outdoor air temperature 35°C; inlet/outlet water temperature 12/7°C.
(2) Cooling : Outdoor air temperature 35°C; inlet/outlet water temperature 23/ 18°C.
(3) Heating: Outdoor air temperature 7°C DB 6°C WB; inlet/outlet water temperature 30/35°C.
(4) Heating: Outdoor air temperature 7°C DB 6°C WB; inlet/outlet temperature 40/45°C.
(5) Cooling: Water temperature inlet/outlet 23/18°C.
(6) Heating: in average climate condition; Tbiv=-7°C; water temperature inlet/outlet 30/35°C.
(7) Sound pressure level measured at 1m from the unit, in free field, according to ISO 3746.
(*)with Hz max function (factory installed). This function can be disabled only with optional kit Evo Touch (unscheduled).
N.B. The performance data are indicative and could be subject to change. In addition, the performances declared in (1), (2), (3) and (4) are to be understood
referring to the instantaneous power according to UNI EN 14511. The declared data in (6) is determinated according to UNI EN 14825.
WARNING: The minimum temperature allowed for storing the unit is 5°C.