RDZ US FLOOR User manual

Chiller and Heat Pumps
US FLOOR / FLOOR-S
HP Split Unit Inverter
INSTALLATION / TECHNICAL MANUAL
Air to water heat pumps with high COP and HP inverter technology
9120488.02
12/2016
bit.ly/rdzwebsite

US FLOOR / FLOOR Minichiller inverter Duo
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FLOOR/FLOOR-S
Internal Unit US 06-09-12-16 External Unit
00 10-2015
Rev Date 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 THIS MANUAL ............................................................................................................... 6
1.1 HOW TO KEEP THIS MANUAL...................................................................................................................................6
1.2 GRAPHIC SYMBOLS ..................................................................................................................................................6
2SAFETY LAWS ...................................................................................................................................................... 6
3PERMITTED USES................................................................................................................................................. 6
4GENERAL SAFETY GUIDELINES ............................................................................................................................. 7
4.1 HEALTH AND SAFETY OF WORKERS..........................................................................................................................7
4.2 PERSONAL PROTECTION EQUIPMENTS....................................................................................................................7
4.3 SAFETY SYMBOLS .....................................................................................................................................................7
4.4 REFRIGERANT SAFETY DATA SHEET.......................................................................................................................... 8
5GENERAL CHARACTERISTICS ................................................................................................................................ 9
5.1 MODELLI DISPONIBILI ..............................................................................................................................................9
5.2 MODEL FLOOR .........................................................................................................................................................9
5.3 MODELS FLOOR-S.....................................................................................................................................................9
6TECHNICAL CHARACTERISTICS ............................................................................................................................. 9
6.1 FRAME......................................................................................................................................................................9
6.2 REFRIGERANT CIRCUIT ...........................................................................................................................................10
6.3 COMPRESSORS.......................................................................................................................................................10
6.4 AIR SIDE EXCHANGERS ...........................................................................................................................................10
6.5 FANS.......................................................................................................................................................................10
6.6 USER HEAT EXCHANGERS.......................................................................................................................................10
6.7 ELECTRIC BOX.........................................................................................................................................................10
6.8 CONTROL SYSTEM..................................................................................................................................................10
6.9 MONITORING AND PROTECTION DEVICES.............................................................................................................10
6.10 HYDRAULIC CIRCUIT...............................................................................................................................................11
6.11 FAN SPEED CONTROLLER .......................................................................................................................................11
6.12 OPTIONAL ACCESSORIES ........................................................................................................................................11
7INSTALLATION................................................................................................................................................... 11
7.1 GENERALITY ...........................................................................................................................................................11
7.2 LIFTING AND HANDLING ........................................................................................................................................12
7.2.1 Indoor unit........................................................................................................................................................12
7.2.2 Outdoor unit.....................................................................................................................................................12
7.3 POSITIONING AND MINIMUM TECHNICAL CLEARANCES.......................................................................................13
7.3.1 Indoor unit........................................................................................................................................................13
7.3.2 Outdoor unit.....................................................................................................................................................13
7.4 HYDRAULIC CONNECTIONS....................................................................................................................................14
7.4.1 Hydraulic circuit................................................................................................................................................15
7.4.2 Connections positions.......................................................................................................................................16
7.4.2.1 Indoor unit..................................................................................................................................................16
7.4.2.2 Outdoor unit...............................................................................................................................................16
7.4.3 Drainage system connection ............................................................................................................................16
7.4.3.1 Indoor unit..................................................................................................................................................16
7.4.3.2 Outdoor unit...............................................................................................................................................17
7.4.4 Installation of the relief valve discharge pipe ..................................................................................................17
7.4.5 Plant circuit water charging .............................................................................................................................17
7.4.6 Discharging of the plant circuit ........................................................................................................................18
7.5 INDICATIVE DIAGRAMS OF THE PLANT CIRCUIT.....................................................................................................19
7.5.1 Standard schematic diagram of the plant........................................................................................................19
7.5.2 Schematic diagram of the plant with DHW recirculation ................................................................................20
7.5.3 Particular schematic diagram of the plant with hydraulic separator and mixing valve ..................................20

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7.5.4 Schema d'esempio RDZ per applicazioni in caldo/freddo con sistemi di ricambio aria/deumidificazione ......21
7.5.5 Schema generico RDZ per applicazioni con SOLARE.........................................................................................21
7.6 REFRIGERANT CONNECTIONS ................................................................................................................................22
7.6.1 Refrigerant diagram for models 06 and 09......................................................................................................23
7.6.2 Refrigerant diagram for models 12 and 16......................................................................................................23
7.7 ELECTRICAL CONNECTIONS....................................................................................................................................23
7.7.1 Indoor unit........................................................................................................................................................24
7.7.1.1 Terminal block connections .......................................................................................................................25
7.7.2 Outdoor unit.....................................................................................................................................................26
7.7.2.1 Terminal block connections .......................................................................................................................26
7.7.3 Wiring between indoor and outdoor units.......................................................................................................27
7.7.4 Removal of the front-right side panel of the outdoor unit models 12 and 16 .................................................28
7.7.5 Safety thermostats ...........................................................................................................................................28
8ARCHITETTURA DEL SISTEMA ............................................................................................................................ 29
9LAYOUT QUADRO ELETTRICO DELL’UNITA’ INTERNA ......................................................................................... 30
10 START UP .......................................................................................................................................................... 30
11 INDICATIONS FOR THE USER.............................................................................................................................. 31
12 SHUTDOWNS FOR LONG PERIODS ..................................................................................................................... 31
13 MAINTENANCE AND PERIODIC CHECKS ............................................................................................................. 31
13.1 ENVIRONMENTAL PROTECTION ............................................................................................................................32
14 WHEN THE UNIT GOES OUT OF SERVICE ............................................................................................................ 32
15 TECHNICAL DATA............................................................................................................................................... 33
15.1 PERFORMANCE DATA ............................................................................................................................................33
15.2 OUTDOOR UNITS....................................................................................................................................................33
15.3 INDOOR UNITS .......................................................................................................................................................34
15.3.1 Models FLOOR/FLOOR-S...................................................................................................................................34
16 ELECTRIC DATA.................................................................................................................................................. 35
16.1 MAXIMUM POWER CONSUMPTION/MAX. INPUT CURRENT OF THE INDOOR UNITS 06-09 .................................35
16.2 MAXIMUM POWER CONSUMPTION /MAXIMUM INPUT CURRENT OF THE INDOOR UNITS 12-16 ......................35
17 PUMPS PERFORMACE CURVES .......................................................................................................................... 35
18 CIRCULATOR PUMPS CURVES ............................................................................................................................ 36
19 READING OF THE INDOOR UNIT MANOMETERS................................................................................................. 36
20 DHW INSTANTANEOUS PREPARER .................................................................................................................... 37
21 SOLAR GROUP (MODELS FLOOR-S) .................................................................................................................... 38
21.1 CIRCULATOR CURVE...............................................................................................................................................39
21.2 CALIBRATION OF THE WATER FLOW BY USING THE FLOW CONTROLLER ..............................................................39
21.3 LOADING OF THE PLANT CIRCUIT...........................................................................................................................39
21.4 WASHING OF THE PLANT .......................................................................................................................................39
21.5 MAINTENANCE OF THE CIRCULATOR PUMP ..........................................................................................................40
21.6 FACTORY SETTINGS OF THE CIRCULATOR PUMP ...................................................................................................40
21.7 TECHNICAL CHARACTERISTICS ...............................................................................................................................40
22 OPTIONAL DHW TECHNICAL SIDE BOILER KIT..................................................................................................... 40
23 PERFORMANCE ................................................................................................................................................. 41
24 OPERATION LIMITS............................................................................................................................................ 43
24.1 EVAPORATOR WATER FLOW RATE ..................................................................................................................................43
24.2 CHILLED WATER PRODUCTION (SUMMER OPERATION) ......................................................................................................43

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24.3 HOT WATER PRODUCTION (WINTER OPERATION) .............................................................................................................43
24.4 AMBIENT AIR TEMPERATURE ........................................................................................................................................43
25 CORRECTION FACTORS FOR OPERAZIONI WITH GLYCOL .................................................................................... 44
26 DIMENSIONS ..................................................................................................................................................... 45
26.1 INDOOR UNITS .......................................................................................................................................................45
26.2 OUTDOOR UNITS....................................................................................................................................................45
27 ACCESS PROCEDURE TO INTERNAL PARTS ......................................................................................................... 46
27.1 INDOOR UNIT .........................................................................................................................................................46
27.2 OUTDOOR UNIT .....................................................................................................................................................46
28 COMPONENTS OF INDOOR AND OUTDOOR UNITS ............................................................................................ 47
28.1 INDOOR UNIT MODEL:FLOOR/FLOOR-S......................................................................................................................47
28.2 INDOOR UNIT TEMPERATURE SENSORS ...........................................................................................................................49
28.3 OUTDOOR UNIT .....................................................................................................................................................49
29 FILTER CLEANING............................................................................................................................................... 50
30 WIRING DIAGRAMS........................................................................................................................................... 50
30.1 INDOOR UNIT ELECTRIC PANEL LAYOUT ................................................................................................................50
30.2 SINGLE-PHASE INDOOR UNIT.................................................................................................................................51
30.3 OUTDOOR UNITS....................................................................................................................................................52
30.3.1 Mod. US 06 - 09................................................................................................................................................52
30.3.2 Mod. US 12 .......................................................................................................................................................53
30.3.3 Mod. US 16 .......................................................................................................................................................54
31 LIMITATION OF WARRANTY .............................................................................................................................. 55

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The US manual 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 THIS MANUAL
This manual provides basic information as for the selection, installation, operation and maintenance of the US units. It is
addressed to the installer and the user of the unit: it allows operating this equipment efficiently, even if the user do not have any
previous specific knowledge of it.
This manual describes the characteristics of the equipment when it was being put on the market; therefore, it may not capture
later technological improvements introduced by the company as part of its constant endeavour to enhance the performance,
ergonomics, safety and functionality.
The company introduces also technological improvements and is not constrained to update the manuals for previous versions of
appliances that could not be compatible. So make sure to use, for the installed unit, the supplied manual.
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. It indicates also general notes.
2SAFETY LAWS
The US units have been designed in compliance with the following Directives and Harmonized 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 Norm
•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 and competent in the existing rules in the
country in which the appliance will be installed.

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4GENERAL SAFETY GUIDELINES
Before beginning to operate on US 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 supply is ‘ON’.
Do not pull, 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 materia
l
s (cardboard, staples, plastic bags,
etc.) as they may represent an environmental and life hazard.
Any routine and
/
or not-routine maintenance operation shall be carried out when the equipment has been shut down,
disconnected from electric and pneumatic power sources and after its pneumatic system has been discharged.
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 has 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 HEALTH AND SAFETY OF WORKERS
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 workers respect them:
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 unauthorized 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 PROTECTION EQUIPMENTS
When operating and maintaining the US units, use the following personal protective equipment.
Protective clothing: Maintenance men and operators has 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 outdoor unit features the following safety signs, which has to be complied with:
General hazard
Electric shock hazard
Presence of moving organs
Presence of surfaces that may cause injures
Presence of hot surfaces which can cause burns

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4.4 REFRIGERANT SAFETY DATA SHEET
Name: R410A (50% Difluoromethane (R32); 50% Pentafluoroethane (R125).
RISKS IN DICATIONS
Major risks: Asphyxia
Specific risks: The rapid evaporation can cause freezing.
FIRST AID
General informations: Never give anything by mouth to an unconscious person.
Inhalation: Outdoors opens transport.
Use oxygen or artificial respiration if necessary.
Do not give 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 clothes.
FIRE PREVENTION
Extinguishing Media: Whatever.
Specifc risks: Increase in pressure.
Specifics methods: Use water spray to cool containers
MISURE IN CASO DI FUORIUSCITA ACCIDENTALE
Personal precautions: Evacuate personnel to safe areas.
Provide adequate ventilation.
Use personal protective equipment.
Environmental precautions: Evaporate.
Cleaning method: Evaporate.
MANIPULATION AND STORAGE
Manipulation
Action/technical precautions: Provide sufficient air exchange and/or exhaust in work rooms.
Recommendations for safe use: Do not breathe vapors or spray mist.
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) = 1000 ml/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: do not ignite.
Density: 1.08 kg/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 powder 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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5GENERAL CHARACTERISTICS
5.1 MODELLI DISPONIBILI
•model FLOOR, 1-phase floor standing version, with technical water puffer tank in 190 L for DHW and technical water puffer
tank in 40 L for plant side
•model FLOOR-S, 1-phase floor standing unit, with technical water puffer tank in 190 L for DHW equipped with solar coil and
technical water puffer tank in 40 L for plant side.
5.2 MODEL FLOOR
As standard:
1) Puffer for technical water of 190 liters for DHW (domestic hot water) and plant technical puffer of 40 liters, with
polyurethane coating of 50 mm thick.
2) Circulator for the heat pump and the rapid preparer of high efficiency according to ErP directive up to values of EEI≤0.21.
3) Pump circulator and rapid preparer of high efficiency according to ErP up to the values EEI≤0,21.
4) Exchangers of the heat pump and of the DHW rapid producer in stainless steel AISI 304.
5) Integrated Y filter.
6) Tap of water charging/discharging for both DHW technical side and plant side.
7) Automatic air vent valves mounted on the plant side and on the DHW technic side.
8) Double manometer 6 bar to measure the water flow/load losses
9) Double expansion vessels of 8 liters, one on the plant circuit side and the other on DHW technic side
10) 3 bar pressure relief valve to be connected with to a collecting system
11) Flow switch for heat exchanger protection
12) Flowmeter for managing the rapid production of DHW
13) Single or three phase electric power supply
14) Electric heater controller logic for plant side in integration and/or substitution
15) Controller logic for boiler or similar source for both plant and DHW technical sides in integration and/or substitution of
the heat pump (digital contact)
16) Integrated climatic system for plant
17) Controller logic for plant remote sensor
18) Integrated controller logic for double set-point of plant side
19) Integrated controller logic for intelligent energy resources
20) Integrable with HNSBox System
Accessories:
1) Mixer’s controller logic for plant side in both heating and cooling operations. controller logic for solar integration.
Controller logic for relaunching circulator (secondary) plant side (optional kit, installed in the factory mod. GI2)
5.3 MODELS FLOOR-S
In addition to the above indicated characteristics:
1) GI2 module for solar integration management logic. Management logic of the relaunching circulator (secondary) plant-
side. Mixing management logic for plant-side for both heating and cooling..
2) Integration and management of solar DHW technical-side equipped with modulating High efficiency circulator according
to ERP Directive with EEi ≤0.21.
3) Flow regulator 2÷12 l/min
4) Compact safety group with safety valve and pressure gauge.
5) Integrated ball valve with thermometer and check valve.
6) Temperature sensors DHW storage technical-side and solar collectors.
7) Expansion vessel not included to be installed externally.
6TECHNICAL CHARACTERISTICS
The reversible heat pumps US 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 63°C using the electric
heaters for environmental heating and sanitary applications.
The new US system, which is the result of the evolution of the previous model, is the ideal solution for the total home climate
control (with the accessories Evo Touch (unscheduled) and HNS Box). For new or already existing house if equipped with a radiant
floor or fan coil as heating system, with feeding from electric power network and a renewable energy sources.
The INVERTER compressor with brushless DC motor technology, matched with electronic expansion valve, pump and variable
speed blower always with brushless motor, as well as the integrated circulators, optimize the power consumption and the
operation efficiency of the refrigerating components and of the entire system.
6.1 FRAME
All US units are made up of hot-galvanized 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 stainless steel. The indoor units also have a self-supporting structure made of galvanized steel with
removable painted panels.

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6.2 REFRIGERANT CIRCUIT
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 gas used in these units is R410A. The refrigerant circuit includes: Safety
device on the gas side, 4 way reverse cycle valve, electronic expansion valve, liquid separator (models 09, 12 and 16), oil separator
(models 12 and 16), liquid receiver, valves for maintenance and control, pressure safety device according to PED regulation (high
pressure switch), pressure transducers to accurately adjust the evaporating and condensing pressures, filters for throttling valve to
avoid its clogging, SAE valves for liquid and gas line.
6.3 COMPRESSORS
The used DC inverter compressors are a rotary hermetic type (for the models 06) and twin rotary (for the models 09, 12 and 16),
and scroll type (for the model 16) 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 shock absorbers.
The compressors are mounted in a separate chamber in order to be separated from the air flow for reducing noises. The crankcase
heater operates when the compressor remains off for duration no less than 30 minutes and when the discharge temperature is
under 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 startup. The checking is possible through the front
panel of the unit that allows the maintenance of the compressors even if the unit is working.
6.4 AIR SIDE EXCHANGERS
The air side exchangers are made up of copper pipes and aluminum fins. The diameter of the copper pipes is 7mm for the model
06 and 09 and 5/16” for the other models 12 and 16, the thickness of the aluminum fins is 0,1mm. The pipes are mechanically
expanded into the aluminum 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 speed (and low noise emission) fan motors.
6.5 FANS
The fans are axial type with aluminum aerofoil blades. They are statically and dynamically balanced and supplied complete of the
safety fan guard according to the CE 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.
6.6 USER HEAT EXCHANGERS
The user heat exchangers are made up of AISI 304 stainless steel braze-welded plate’s type. The user heat exchangers are factory
insulated with flexible close cell material. Each evaporator 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 condition parameters set in the controller have
been occurred.
6.7 ELECTRIC BOX
The electric box is manufactured according to according current European Union laws. The accessibility to the electric board is
possible after removing the side and top panels of the outdoor unit by using an appropriate tool, and by removing the ABS plastic
cover for the indoor units. The protection degree is IP24. The outdoor unit terminal board is supplied with voltage free contacts
for general alarm. The indoor unit terminal board is supplied with contacts for the sanitary water temperature sensor, auxiliary
heater and the handling of the outer 3-way valve.
6.8 CONTROL SYSTEM
All US units are equipped with a microprocessor adopting an overheating control logic program through the electronic
thermostatic valve managed by the pressure transducers signals and temperature sensor. The microprocessor can manage also
the following functions: water temperature regulation, antifreeze protection, compressor’s time setting, compressor automatic
starting sequence, alarm reset, alarm management and operating LED. The control system together with the INVERTER technology
and the on board sensors continuously monitor and adapt the performance of the inverter compressor, and of the fan (2 fans as
for the US 12 and US 16 models).
The INVERTER system allows to reduce the plant’s water content to the minimum, that is from the usual value of cooling 12-16
l/kW to 18 liters for the model US 06, to 25 liters for the model US 09, to 35 liters for the model US 12 and to 45 liters for the
model US 16 in ABSOLUTE, as for the US units can also be installed in plants without water tank with advantages in terms of the
reduced dimensions of the unit, the installation space, the heat loss, the installation costs and the plant maintenance.
6.9 MONITORING AND PROTECTION DEVICES
All internal 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 and on water side a water flow switch is installed to protect the evaporator. All internal units are supplied with high
pressure transducer, low pressure transducer, compressor’s inlet and outlet temperature sensors, compressors thermal protection
device, fans thermal protection device, high pressure flow switch HP.

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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 09 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.
6.10 HYDRAULIC CIRCUIT
The US outdoor units are supplied with an integrated hydraulic circuit including a high efficiency (EEI≤0,23) modulating BRUSHLESS
circulator, suitable also for chilled water utilization and is directly managed by the controller on board the unit, Y filter with a mesh
of 1000 µm, plate heat exchanger, flow switch for protection, 3-way valve for commutation between plant side and DHW technical
side, expansion vessel of 8 liters plant circuit side (standard in FLOOR/FLOOR-S models), expansion vessel of 8 liters plant side, the
automatic air release valve and relief valve (3 bar) to be connected to the collecting system.
6.11 FAN SPEED CONTROLLER
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.
6.12 OPTIONAL ACCESSORIES
NO FACTORY FITTED ACCESSORIES (OPTIONAL)
Rubber shock absorbers to be inserted at the basement of the outdoor unit to dampen possible vibrations.
Antifreeze kit. It uses a self-heating cable wrapped at the basement of the outdoor unit near the condensing coil.
IMPORTANT
ONLY THE NO FACTORY-FITTED OPTIONA ACCESSORIES CAN BE REQUIRED AFTER THE ORDER OF THE UNIT, WHILE THE
FACTORY-FITTED OPTIONAL ACCESSORIES CANNOT BE REQUIRED AFTER ORDERING OF THE UNIT.
7INSTALLATION
WARNING: All the operation described below 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 moto-condensing units are designed for outdoors installation. The installation place should be
enough away. From far risks. Therefore all the necessary measures should be adopted in order to prevent the risk of
fire at the installation place. In any case the outside temperature must not exceed 46°C. Beyond this value, the unit is
no longer covered by the actual regulations in the field of safety of pressure equipment.
WARNING: If they should be installed in an areas of the building subject to low temperatures (attics, basements,
etc.), refer please to the precautions listed in Chapters 12 and 25).
WARNING: The unit must be installed so as to allow for the repair and maintenance operations. The warranty does
not cover costs due to platforms or other lifting systems needed for eventual interventions.
All checks and maintenance operations must be carried out only by qualified personnel.
Before any operation on the unit, make sure that the electric supply is disconnected.
WARNING: Inside the unit, there are some moving components. Be very careful when operating in their surroundings
even if the electric power supply is disconnected.
The top part and discharge pipes of the compressor operating at high temperatures. Be sure to let the unit to become
cool before beginning any maintenance work.
Be especially careful when going to operate in the surrounding of the coils.
The aluminum fins are very sharp and can cause serious injury.
After the maintenance operations, close the panels by fixing them with screws.

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7.2 LIFTING AND HANDLING
The handling must be performed by qualified personnel, properly equipped with appropriate equipment regarding the weight and
the encumbrance of the unit, in compliance with safety regulations of accident preventing.
7.2.1 Indoor unit
•The apparatus is supplied on wooden pallets protected by
carton packing box.
•Do not place anything on the top of the carton box.
•Insert the forks from the indicated side.
•During the unloading of the unit, utmost care must be
taken to avoid abrupt or violent maneuvers in order to
protect the internal electronic components.
•During handling keep the unit vertically.
•Before you remove the packaging, loosen the screws
securing the unit to the pallet.
It is recommended to unpack the unit only with equipment
positioned near the installation place, otherwise take special
care not to damage the unit when handling it.
Removal of the packing box:
•Cut the strap fasteners.
•Lift the carton box upward.
•Remove the corner pieces of polystyrene foam.
•Remove the unit from the pallet using a suitable belt straps
(at least two persons equipped with suitable protective
equipment for the hands and feet)
7.2.2 Outdoor unit
It is recommended to unpack the unit only with equipment
positioned near the installation place, otherwise take special care
not to damage the unit when handling it.
Removal of the packing box:
•Cut the strap fasteners.
•Remove the apparatus by lifting the packing upward.
•Remove the corner pieces of polystyrene foam.
•Remove the unit from the pallet by unscrewing the screws that
hold the feet to the pallet itself.
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.

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7.3 POSITIONING AND MINIMUM TECHNICAL CLEARANCES
7.3.1 Indoor unit
The installation must allow authorized personnel to operate in the
event of maintenance, in an easy manner respecting both the safety
distances between the units and other apparatus that the technical
spaces (expressed in mm) indicated in the table:
(*) Recommended distances for lateral inspection in case of
concealed installation. In case concealed installation, the inspection
side is not required and you can keep up to 5 mm on each side.
MOD. L1* L2* H1
FLOOR/FLOOR-S 06-09/12-16 300 300 300
•Make sure that the equipment is installed and protected from
the weather elements in a clean and dry location.
•Place the unit on the wall.
•The feet should be in horizontal level.
(A) Level
7.3.2 Outdoor unit
All the outdoor units of US series are designed for outdoor installation: any cover over the unit and location near trees (even if
they partially cover the unit) is avoided in order to allow the 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 (expressed in mm):
MOD. AB* C DE**
06 1500 500 400 400 500
09 1500 500 400 400 500
12 1500 500 400 400 500
16 1500 500 400 400 500
* Minimum clearances recommended for installation
and maintenance.
** Minimum clearances recommended for assistance
and maintenance.

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1
Positioning on the floor
Provide lifting from the floor of the unit:
•20 mm without conveying the condensate drain
•90 ÷ 100 mm to allow the conveying of the
condensate drain
In case of installation in areas subjected to extreme cold
or heavy snow, where there is the possibility of freezing,
it’s recommended to provide suitable frost protection
systems.
(A) Level
(1) condensate drain pipe
Suspended positioning
•In the case of suspended installation, adequate
brackets must be used to support the weight of
the unit and also depending also on the type of
the wall to which should be fixed.
•Make sure that the section of the wall doesn’t
overlap to bearing elements of construction,
pipelines or power lines.
(2) brackets for positioning (not supplied with the unit)
Both units must be positioned on a leveled surface, the holders used for installation must be able to support its
weight.
7.4 HYDRAULIC CONNECTIONS
The hydraulic connections have to be installed in accordance with national and/or 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. It is recommended to connect the
indoor unit to the piping using flexible joints. The hydraulic circuit should include the following components:
•Hole thermometers to monitor the circuit’s temperature.
•Manual shut-off valves to separate the chiller from the hydraulic circuit.
•Charging group and discharge valve.
•Anti-vibration joints and supports for the piping where necessary.
WARNING: make sure that the size of the pipes shall not exceed the maximum head loss on the plant side given in
the table in the Paragraph 15.3 (see the available pressure head data).
WARNING: connect the pipes to their attacks a
l
ways by the way of key against key method.
WARNING: The plant side expansion vessel included in the models FLOOR
/
FLOOR-
S
has a limited capacity of 8
liters. The installer should verify that if the expansion vessel is adequate to the real capacity of the plant circuit,
otherwise should be provide an additional expansion vessel.
For the installation position of the expansion vessel (indicated as additional expansion vessel), please refer to
Paragraph 7.5.
WARNING: check that the weight of the pipes does not grave about the structure of the machine.
WARNING: unit water return pipe should be in correspondence with the connection labelled: ”TECHNIC WATER
RETURN”, otherwise the evaporator may freeze.
WARNING: If the water flow switch (factory mounted) is altered or removed, the warranty will no longer be valid.
Please refer to the wiring diagram for the water flow switch electric connections.
The metallic Y-filter with 1 mm mesh must be kept clean, so make sure that it is sti
l
l clean after the installation of
the unit, and then check it periodically.
The water on the charging
/
topping-up pipe must be opportunely pre-filtered from any suspended particles and
impurities through the use cartridge filter (washable, wrapped wire, etc.) of at least 100 microns.
Check the water hardness with which you load and top up the plant circuit. With particularly hard water, in this
case it is necessary to utilize a water softener. For treating water for the plant, please refer to UNI 8065.

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7.4.1 Hydraulic circuit
To the plant
From the plant
Plant side Puffer
FM
R
R
I
N
D
O
O
R
UN
I
T HY
D
R
O
N
I
C
C
I
R
C
U
I
T
(
m
o
de
l
: MA
R
P
/
MA
R
P
S
)
7
3
4
5
6
1
2
F S
Diverter valve
P
P
TP
D
Gas pipe
Liquidpipe
DHW technical
side Puffer
From the boiler (KCACS kit)
To the boiler (OPTIONAL)
To the DHW-R ulity
Water supply inlet
To solar plant
(mod. FLOOR-S) From solar plant
(mod. FLOOR-S)
Exchanger
R410A/water
Key
Circulator pump
FS
Flow switch
FM
Flow meter
3 bar relief valve
8 liters expansion vessel
Air vent valve
Y-filter with metallic mesh of
1000µ
Temperature sensor
R
Oponal auxiliary electric
heater with double
protecon thermostat
Check valve
Manometer 0-6 bar
Dial thermometer
Flow regulator valve
1 Heat exchanger inlet
sensor
2 Heat exchanger outlet
exchanger
3 DHW technical side
sensor
4 Primary circuit inlet sensor
DHW-R
5 Secondary circuit sensor
DHW-R
6 Secondary circuit outlet
sensor DHW-R
7 Solar management sensor
(models MRS – FLOOR-S)

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7.4.2 Connections positions
7.4.2.1 Indoor unit
A. From the plant (1”M)
B. To the plant (1”M)
C. Water supply inlet (3/4”M)
D. The user DHW-R (3/4”M)
I. Liquid line (see Paragraph 15.3)
L. Gas line (see Paragraph 15.3)
F. To the solar plant (3/4”M)
E. From the solar plant (3/4”M)
For DH
W
-R user, it means the point(s) of using of domestic hot water produced by the instantaneous preparer DHW.
The DHW-R means “rapid” production of the domestic hot water.
7.4.2.2 Outdoorunit
Units 06 and 09
A. Power supply cover (to reach the terminal block)
B. Gas connecons cover
C. Gas connecons
Models Liquid pipe Gas pipe
06 1/4 SAE 1/2 SAE
09 3/8 SAE 5/8 SAE
Units 12 and 16
A. To reach the power supply and signal
cables (remove the rear side cover to
reach the terminal block)
B. Gas connecons cover
C. Gas connecons
Models Liquid pipe Gas pipe
12 3/8 SAE 5/8 SAE
16 3/8 SAE 5/8 SAE
7.4.3 Drainage system connection
7.4.3.1 Indoor unit
The connecon of a condensate drainage system is not necessary for the indoor units since all pipes and cold components are
insulated with closed-cell foam of an adequate thickness.
B
A
C
B
A
C
FLOOR
FLOOR-S
FLOOR / FLOOR-S with boiler kit
IL
G. From the boiler (3/4”M) (oponal)
H. To the boiler (3/4”M) (oponal)

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7.4.3.2 Outdoorunit
All the outdoor units have been designed in a way to use their own basement as a drain pan.
•Locate the hole at the basement of the unit between the
finned coil and fan, A.
•Connect to the hole the provided fing joint, B.
•Connect a hose to the nozzle of the supplied fing joint.
•Direct the hose into the disposal place for condensate
water.
•Keep a sufficient slope to ensure the smooth flow of
condensate water.
7.4.4Installation of the relief valve discharge pipe
On the basis of the indoor unit there is a drain pipe in PVC, internally connected to
the unit on both safety valves outlet connecons of the plant side/DHW technical
side and of the solar integraon circuit (FLOOR-S model) in order to ensure the
proper discharge of the water when the relief valve opens in case of overpressure.
•Connect a rubber pipe to the drain pipe by means of hose pipe joint connector of
14 mm (not supplied)
• Secure it with pipe clamp.
• Direct the hose towards an appropriate locaon for unloading.
• A sufficient slope should be maintained to ensure the smooth flow.
• Do not "strangle" the pipe.
• Check for proper water drainage
A) hole for overpressure valve discharge
7.4.5 Plant circuit water 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 al
w
ays 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 reducer and
a relief valve as indicated in the Paragraph 7.5.
WARNING: The water on the charging
/
topping-up pipe must be suitably pre-ltered from any impurities and
suspended particles. Make sure that you have installed a ca rtridge lter removable as indicated in Paragraph 7.5.
WARNING: before proceeding to the charging
/
topping-upof the plant circuit, place in mi
d
-travel the 3-way valve
of the indoor unit by actuating the black lever. Restore the normal position of the black lever after nishing the
charging/topping-up operation of the plant circuit.
WARNING: Before beginning the charging
/
topping-up operation, unscrew the plugs of the air vent valves
(two on FLOOR/FLOOR-S models).Tighten the plugs after nishing the operation of
charging/topping-up of the plant circuit system.
WARNING: instead of using a xed installation of the line lling
/
topping up
,
as indicated in Paragraph 7.5
,
you can
alternatively use the discharge valves of which is already provided with the puer of the indoor unit. In this case, it
is mandatory that the inlet water should be pre-ltered with (with at least 100 microns pre lter) and the pressure
of the water entering should be controlled (max 0.8 to 1 bar).
During the charging/topping-up operaon, the black lever of the 3-way valve (located at
the top of the valve) must be posioned halfway and kept in that posion by making a
pressure toward the valve interior. In this mode all the three ways (AB-A-B) communicate
with each other and consequently the plant side with DHW technical side. To unlock the
valve, aer the end of charging period, push the lever down unl the complete release
(check if the lever returns to its lied posion).
Refer to pos. 10 Paragraph 28.1.
(1) Black lever three-way valve
A
B

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When the three-way valve is de-energized, it is turned to B position (towards the plant side).
Looking at the front side of the valve, the way normally open (B) is in the left side.
7.4.6 Discharging of the plant circuit
If it‘s necessary to drain completely the indoor unit, connect with a pipe to the service valves (both service valves for the models
FLOOR/FLOOR-S). Then unscrew the cap of the service valve and connect to the hose pipe joint connecter a pipe of 14 mm (inner
diameter) which must be connected to the drain water, then proceed to evacuate the plant circuit by unscrewing the knurled nut.
After the end of the process, close again the knurled nut and screw the cap. Refer to the previous paragraph regarding the
position and the utilization mode of the valves.
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.
The models FLOOR/FLOOR-S are equipped with two air vent valves, one on the other DHW
technical side puffer and the other on the puffer of the plant side.
(2) Stopper of the air vent valve
When it’s necessary to top up the circuit of the plant or to adjust
the title of glycol (in the cases described in Chapter 25), you can
use the service valves. Unscrew the cap of the service valve and
connect to joint connector a hose pipe of 14 mm (inner diameter)
which should be connected to the water supply, then unscrew
the knurled nut to load the plant circuit. At the end of the
operation, retighten the knurled nut and screw the cap. At any
case, it‘s recommended to use an external water tap for loading
the plant circuit, this should be done by the installer.
(A) service valve of plant side puffer tank (models
FLOOR/FLOOR-S)
(B) service valve of DHW technical side puffer tank
(3) knurled nut
(4) stopper with gasket

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7.5 INDICATIVE DIAGRAMS OF THE PLANT CIRCUIT
WARNING: The diagrams shown in this paragraph are should be considered only for illustration purpose.
The study and the approval of the specic installation context of the plant is always required by a qualied heating
engineer.
7.5.1 Standard schematic diagram of the plant
BOILER
To DHW ulity
Addional
expansion vessel
(not supplied)
From the solar plant
THIS RECOMMENDED CONNECTIONS
SHOULD BE DONE BY THE INSTALLER
Hydronic circuit
Indoorunit
(models: FLOOR-S)
OUTDOOR UNIT
Piping connecons for
gas and liquid shall be
done by the installer
From the boiler (technicla water)
To the boiler (technical water)
To the solar plant
Solar plant
expansion vessel
(not supplied)
To the plant
To the domesc utili es
Charging/topping up line
Water
supply
inlet
PLANT
To the plant
P T
P T
Key
Filter with extractable
cartridge
Loading group with
pressure reducer
device
Discharging valve
3 bar relief valve
Shut-off valve
Check valve
Manometer 0-6 bar
Dial thermometer
3-way an-scalding
thermostac valve
Domesc water
mixer
NTC temp. sensor for
immersion (solar
collector)
All the components inside the dashed line "CONNECTIONS THAT SHOULD BE DONE BY THE INSTALLER" are
indicated but are not supplied.
WARNING: It is recommended to install a 3 bar relief valv e (not supplied) as shown in the plant diagram. It is
necessary to install one automatic air vent at the highest point of the plant circuit.
An additional expansion vessel is required (not supplied) for absorbing the volume changes in the plant circuit side.
The integrated 8 liters expansion vessel is expected in the models FLOOR/FLOOR-S. Please install an additional
expansion vessel if the integrated one is judged insucient.