Ferroli RXA User manual

RXA
AIR-WATER CHILLERS AND HEAT PUMPS
WITH AXIAL FANS
TECHNICAL MANUAL

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TABLE OF CONTENTS
GENERAL FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
UNIT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
UNIT IDENTIFICATION CODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
DESCRIPTION OF PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
VERSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
TECHNICAL DATA AND PERFORMANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
TECHNICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
NOMINAL PERFORMANCE IR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
NOMINAL PERFORMANCE IP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
PERFORMANCE IN COOLING (IR AND IP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
PERFORMANCE IN HEATING (IP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
WEIGHTS OF UNITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
ELECTRICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
NOISE LEVELS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
PRESSURE LOSSES (VERSION VB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
USEFUL HEAD (VERSION VP AND VA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
OPERATION LIMITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
PLUMBING CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
EXPANSION TANK SETTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
ELECTRICAL CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

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GENERAL FEATURES
Unit description
This series of air-water chillers and heat pumps has been designed to satisfy the air conditioning requirements of residential and
commercial plants of small and medium size and can be applied both to fan coil plants and to radiant floor plants.
All the units are suitable for outdoor installation. The bearing structure and the panels are realized with galzanized and coated
metal sheets to ensure a good protection against adverse weather conditions.
All the units are equipped with a compressor (rotary or scroll depending on the model), axial fans with safety protection grilles,
finned coil realized with copper tubes and aluminium louvered fins, brazed plate heat exchanger thermically insulated to reduce
heat dispersions and to avoid condensate generation and protected by means of a water differential pressure switch and of an
antifreeze electrical heater.
As part of the standard outfit the units are equipped with variable speed control of the fans in order to allow the units to operate
both with low outdoor temperature in cooling mode and with high outdoor temperature in heating mode as well as to reduce noise
emissions in such operating conditions. All three-phase power supply units are provided with a phase presence and sequence
monitoring device as part of the standard outfit.
Each model is available in 3 versions in order to match the different installation requirements :
- base version
- pump version
- pump and storage tank version.
The units operate with R410A refrigerant gas.
All the units are accurately built and individually tested in the factory. Only electric and hydraulic connections are required for
installation.
IP 14.1 VB AB 0 M 5
VB - Basic Version
VP - Pump Version
VA - Storage Version
Unit version
(1) : Mod. 6 - 7 - 9 - 11
(2) : Mod. 9 - 11 - 14 - 17
1 - 230V - 1 - 50 Hz (1)
5- 400V - 3N - 50Hz (2)
Unit identification code
The codes that identify the units and the meaning of the letters used are described below.
AB - Standard Preparation
Acoustic setting up
0 - R410A
Refrigerant type
M - Average temperatures.
The unit is suitable for
installation in places with
temperate climates.
Operating climate
Power supply
IR - unit for installation in a
hydronic system operating as
a cooler.
IP - unit for installation in a
hydronic system operating as
a heat pump.
Unit type
Unit model
N° of compressors

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GENERAL FEATURES
Description of parts
The supporting structure (1), base and external panelling are
made from hot galvanised steel sheet, painted with epoxy
powers (colour RAL 7035) to ensure good resistance to
atmospheric agents.
The axial-type fans with curved profile blades (2)are housed in
a sheet casing and are complete with safety grille. Fan speed
is controlled in a continuous way by a phase cut device that
allows the condensing pressure (in cooling) and evaporation
pressure (in heating) to be controlled according to the value
read by the temperature probe on the liquid line.
The rotary type hermetic compressor (3) (models 6 or 7) or
scroll (models 9, 11, 14 and 17) is complete with
overtemperature and overcurrent protection. It is fixed to the
base by means of rubber vibration dampers and placed in a
compartment separate from the air flow to facilitate
maintenance and control operations. To prevent reverse
compressor rotation on all the units with three-phase power
supply, a device that controls the presence and correct
sequence of the power phases is fitted. Units in heat pump
version have a heating element that is activated when the
compressor switches off, to keep the compressor crankcase oil
temperature high enough to prevent migration of the refrigerant
during winter stops and to evaporate any liquid present in the
crankcase, in order to prevent possible liquid rushes on
starting.
The braze-welded stainless steel plate-type exchanger on the
user side (4) is adequately insulated to prevent the formation
of condensate and to limit heat loss to the outside. It is protected against the risk of ice forming by an antifreeze heating element
activated according to the water temperature and by a differential pressure switch that detects a possible lack of water flow.
The external side exchanger (5) comprises a finned coil with grooved copper pipes arranged in an equilateral shape and
aluminium fins with notched profile to increase the heat exchange coefficient. A tray is obtained in the base for collecting the
condensate produced during heating operation.
The lamination part comprises a thermostatic valve (6) with external equaliser that allows the unit to adjust to the various
operation conditions, keeping the set level of overheating constant.
The refrigerant circuit of each unit is also complete with :
- hermetic dehydrator filter with solid cartridge (7) : it catches residuals of impurities and any traces of moisture in the circuit;
- high pressure switch (8) : with fixed setting and manual reset;
- low pressure switch (9) : with fixed setting and automatic reset (it becomes manual only in case of frequent activations);
- 4-way reverse cycle valve (10) : it allows the switching of operation mode, reversing the refrigerant flow (for units in heat pump
version only);
- liquid receiver (11): it compensates the variation in refrigerant charge required with the change of operation mode (for units in
heat pump version only);
- pressure test points (12) SAE 5/16” (UNF 1/2” - 20) complete with pin, seal and blind union, as required for the use of
refrigerant R410A. They enable a complete check of the refrigerant circuit : compressor inlet pressure, compressor delivery
pressure, pressure upstream of the thermostatic valve and pressure losses on the dehydrator filter.
1
2
3
10
9
5
4
6
7
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GENERAL FEATURES
Versions
Each model can be supplied in three different versions to meet the application needs of the systems. The unit always comes
assembled, wired and factory-tested.
Basic Version - VB
The unit does not contain a circulating
pump or storage tank. Therefore an
adequate flow of water through the
plate-type exchanger must be
guaranteed to prevent activation of the
internal safety devices. If adequately
sized, the pump can in any case be
connected to the unit’s electrical panel
and managed by the controller.
Pump Version - VP
The unit contains a circulating pump,
metal cartridge filter (to protect the
plate-type exchanger), air vents and
drain cock.
Storage Version - VA
The unit contains a storage tank
(configured as storage on the delivery to
the system), circulating pump, metal
cartridge filter (to protect the plate-type
exchanger), air vents, safety valve,
expansion tank and drain cock.. The
tank is also arranged for fitting
antifreeze or supplementary heating
elements.
The command and control electrical panel incorporated in the
unit contains all the power, adjustment and safety components
necessary to guarantee correct operation. The main switch
and user interface are accessible from the outside by opening
a hermetic door.
The main components are :
- main switch (thermal magnetic)
- microprocessor controller with user interface and
incorporated phase cut card
- compressor contactor
- wiring board with transformer, protection fuses and user
terminal block
- mesh filter
- compressor start condenser (units with single-phase power
supply only)
- start condenser for fans
- device for control of presence and correct power supply
phase sequence (units with three-phase power supply only)
The unit is managed by a microprocessor controller to
which all the loads and control devices are connected by
means of a wiring board. The user interface comprises a
display and 4 buttons for displaying and possibly modifying all
the unit’s operation parameters. A remote keyboard with all the
functions of the interface fitted on the machine is available as
an accessory.
The main functions available are :
- adjustment of treated water temperature (by setting the
setpoint)
- climate control in heating (modification of setpoint according
to the outside air temperature)
- dynamic defrost according to outside air temperature
- display of active alarms and alarms history
- continuous fan speed control
- pump management
- recording of compressor and pump operation hours
- serial communication by Modbus protocol
- remote standby
- remote cooling-heating
- digital output for general alarm

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GENERAL FEATURES
Accessories
Coil protection grilles - GP
It comprises a painted electrowelded grille that protects the finned coil.
Rubber vibration dampers - AVG
These reduce the transmission to the machine support surface of mechanical vibrations generated by the compressor and fans
during their normal operation. The number of vibration dampers depends on the version. To ensure the efficiency of this
accessory it is advisable to use vibration-damping joints on the plumbing connections.
Tank antifreeze heating element - RAG
Activated together with the plate-type exchanger antifreeze heating element, its purpose is to keep the water in the storage tank
at a suitable temperature to prevent ice forming during winter idle periods.
Supplementary heating elements - REL
They supplement or substitute the heating power supplied by the heat pump and are managed by the unit’s controller with two-
step logic. They also substitute the tank antifreeze heating element accessory (RAG).
Remote control - CR
The remote control is suitable for wall mounting and has all the control and display functions available on the unit’s interface. It
therefore enables complete remote control of the unit.
Serial interface - KMB
It enables communication with the unit’s controller and monitoring the operating conditions by means of Modbus communication
protocol. Use of the RS485 serial line ensures the quality of the signal up to distances of approx. 1200 metres (extendable by
means of special repeaters).
Programmer clock - OP
It allows the unit to be turned on and off according to a preset programme by operating on the digital input available on the unit’s
control card (remote on-off).
MODEL
ABBREV. ACCESSORY
Version
VB VP VA
GP Coil protection grilles F F F
AVG Rubber vibration dampers F F F
RAG Tank antifreeze heating element - - F
REL Supplementary heating elements - - M
CR Remote control F F F
KMB Serial interface F F F
OP Programmer clock F F F
M : accessory factory-installed
F : accessory supplied (installation to be carried out by the customer)

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TECHNICAL DATA AND PERFORMANCE
Technical data
Frame 1 2 3
Model 6.1 7.1 9.1 11.1 14.1 17.1 U.M.
Electrical power supply 230-1-50 230-1-50 230-1-50 400-3N-50 230-1-50 400-3N-50 400-3N-50 400-3N-50 V-ph-Hz
Compressor
Type rotativo scroll -
Quantity 1 n°
Capacity steps 0 - 100 %
Oil charge 1,13 1,13 1,20 1,20 1,80 1,80 1,80 1,80 kg
Refrigerant
Type R410A -
Refrigerant
Type axial -
Quantity 1 2 n°
Diameter 450 500 mm
Max. rotation speed 900 rpm
Total installed power 0,15 0,21 0,42 kW
Plate-type heat exchanger
Type braze-welded plates -
Quantity 1 n°
Water content 0,29 0,29 0,46 0,46 0,46 0,46 0,53 0,72 l
Finned coil
Type copper pipes - aluminium fins -
Quantity 1 n°
Front surface 0,60 0,77 0,98 m2
Pump (versions VP and VA)
Type circulating pump multistage centrifugal pump -
Quantity 1 n°
Installed power 0,20 0,75 kW
Storage tank (version VA)
Storage volume 33 50 71 l
Safety valve setting 6 bar
Expansion tank volume 5 l
Tank antifreeze heating element - RAG
Power 0,25 kW
Supplementary heating elements - REL
Power 3,3 3,3 / 6,6 6,6 kW
Capacity steps 2 n°

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TECHNICAL DATA AND PERFORMANCE
Nominal performance IR
Nominal performance IP
Frame 1 2 3
Model 6.1 7.1 9.1 11.1 14.1 17.1 U.M.
Electrical power supply 230-1-50 230-1-50 400-3N-50 230-1-50 400-3N-50 400-3N-50 V-ph-Hz
Cooling (air 35 °C bs / water 12 - 7 °C )
Refrigerating capacity (E) 6,20 7,40 9,40 9,40 10,8 10,8 13,8 17,3 kW
Total input (VB) (E) 2,15 2,85 3,70 3,70 4,15 4,15 5,15 6,65 kW
total EER (VB) (E) 2,88 2,60 2,54 2,54 2,60 2,60 2,68 2,60 -
Water delivery 1066 1273 1617 1617 1858 1858 2374 2976 l/h
Pressure losses (VB) (E) 28 38 26 26 33 33 40 35 kPa
Useful head (VP-VA) 73 58 170 170 152 152 122 96 kPa
Cooling (air 35 °C bs / water 23 - 18 °C )
Refrigerating capacity 7,40 8,90 11,3 11,3 13,0 13,0 16,6 20,8 kW
Total input (VB) 2,20 2,90 3,80 3,80 4,25 4,25 5,30 6,85 kW
Total EER (VB) 3,36 3,07 2,97 2,97 3,06 3,06 3,13 3,04 -
Water delivery 1273 1531 1944 1944 2236 2236 2855 3578 l/h
Pressure losses (VB) (E) 38 53 36 36 46 46 56 49 kPa
Useful head (VP-VA) 58 37 146 146 122 122 82 49 kPa
ESEER(VB)(E) 3,26 2,94 2,88 2,88 2,94 2,94 3,04 2,94 -
Frame 1 2 3
Model 6.1 7.1 9.1 11.1 14.1 17.1 U.M.
Electrical power supply 230-1-50 230-1-50 230-1-50 400-3N-50 230-1-50 400-3N-50 400-3N-50 400-3N-50 V-ph-Hz
Cooling (air 35 °C bs / water 12 - 7 °C )
Refrigerating capacity (E) 6,00 7,10 9,20 9,20 10,6 10,6 13,6 17,1 kW
Total input (VB) (E) 2,15 2,85 3,70 3,70 4,15 4,15 5,15 6,65 kW
Total EER (VB) (E) 2,79 2,49 2,49 2,49 2,55 2,55 2,64 2,57 -
Water delivery 1032 1221 1582 1582 1823 1823 2339 2941 l/h
Pressure losses (VB) (E) 26 35 25 25 32 32 39 34 kPa
Useful head (VP-VA) 75 62 173 173 155 155 124 99 kPa
Cooling (air 35 °C bs / water 23 - 18 °C )
Refrigerating capacity 7,20 8,50 11,0 11,0 12,8 12,8 16,3 20,5 kW
Total input (VB) 2,20 2,90 3,80 3,80 4,25 4,25 5,30 6,85 kW
Total EER (VB) 3,27 2,93 2,89 2,89 3,01 3,01 3,08 2,99 -
Water delivery 1238 1462 1892 1892 2202 2202 2804 3526 l/h
Pressure losses (VB) (E) 36 49 34 34 45 45 54 48 kPa
Useful head (VP-VA) 60 43 150 150 125 125 86 53 kPa
ESEER(VB)(E) 3,16 2,82 2,82 2,82 2,89 2,89 2,99 2,91 -
Heating (air 7 °C bs - 6 °C bu / water 40 - 45 °C )
Heat output (E) 7,00 8,20 10,4 10,4 11,5 11,5 15,3 18,6 kW
Total input (VB) (E) 2,25 2,75 3,65 3,65 4,05 4,05 4,95 6,40 kW
Total COP (VB) (E) 3,11 2,98 2,85 2,85 2,84 2,84 3,09 2,91 -
Water delivery 1204 1410 1789 1789 1978 1978 2632 3199 l/h
Pressure losses (VB) (E) 34 46 31 31 37 37 48 40 kPa
Useful head (VP-VA) 63 47 157 157 143 143 101 79 kPa
Heating (air 7 °C bs - 6 °C bu / water 30 - 35 °C )
Heat output 7,20 8,40 10,6 10,6 11,7 11,7 15,6 19,0 kW
Total input (VB) 1,90 2,35 3,05 3,05 3,40 3,40 4,15 5,40 kW
Total COP (VB) 3,79 3,57 3,48 3,48 3,44 3,44 3,76 3,52 -
Water delivery 1238 1445 1823 1823 2012 2012 2683 3268 l/h
Pressure losses (VB) (E) 36 48 32 32 38 38 50 42 kPa
Useful head (VP-VA) 60 44 155 155 140 140 97 74 kPa
(VB) : only for base version VB
(VP-VA) : only for pump version VP and tank version VA
(E) : data declared according to EUROVENT certification programme