Riello NXHP Series Manual

INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
Doc-0218882 rev. 0 04/2023
NXHP

2
1 - INTRODUCTION............................................................................................................................................................................ 6
1.1 - Introduction................................................................................................................................................................................6
1.2 - Safety ........................................................................................................................................................................................6
1.3 - Preliminary checks ..................................................................................................................................................................14
1.4 - Dimensions and clearance for NXHP 4-14 units..................................................................................................................... 15
1.5 - Physical data and electrical data of NXHP units .....................................................................................................................17
1.6 - Accessories .............................................................................................................................................................................19
2 - INSTALLATION OF UNIT ...........................................................................................................................................................20
2.1 - General....................................................................................................................................................................................20
2.2 - Moving and placing the unit.....................................................................................................................................................20
2.3 - Water connections...................................................................................................................................................................23
2.4 - Electrical connections..............................................................................................................................................................27
2.5 - Water ow rate control ............................................................................................................................................................29
2.6 - Commissioning modes............................................................................................................................................................ 32
2.7 - Check before start the unit ......................................................................................................................................................33
3 - INSTALLATION OF SYSTEM...................................................................................................................................................... 34
3.1 - General customer electrical connection on terminal block...................................................................................................... 34
3.2 - First step of conguration: Setting the time and day ...............................................................................................................34
3.3 - Second step of conguration: Parameter menu...................................................................................................................... 35
3.4 - Installation with electrical booster heaters...............................................................................................................................37
3.5 - Unit with remote user interface................................................................................................................................................39
3.6 - Remote OAT sensor................................................................................................................................................................42
3.7 - Master/Slave installation .........................................................................................................................................................42
4 - OPERATION ................................................................................................................................................................................47
4.1 - Unit range - NXHP...................................................................................................................................................................47
4.2 - Operating modes ....................................................................................................................................................................47
4.3 - Major system components ......................................................................................................................................................60
5 - MAINTENANCE........................................................................................................................................................................... 62
5.1 - Standard maintenance ............................................................................................................................................................62
5.2 - Tightening torques...................................................................................................................................................................63
5.3 - Air heat exchanger ..................................................................................................................................................................64
5.4 - Water heat exchanger maintenance .......................................................................................................................................64
5.5 - Unit maintenance ....................................................................................................................................................................64
5.6 - Refrigerant volume.................................................................................................................................................................. 64
5.7 - Characteristics of R-290..........................................................................................................................................................65
6 - ALARM DESCRIPTION...............................................................................................................................................................66
6.1 - Alarm listing............................................................................................................................................................................. 66
7 - PARAMETERS OVERVIEW ........................................................................................................................................................69
7.1 - Parameters list ........................................................................................................................................................................69
7.2 - Description of customized DI/DO congurations..................................................................................................................... 80
8 - START-UP CHECKLIST FOR NXHP HEAT PUMPS (USE FOR JOB FILE).............................................................................. 81
8.1 - General information.................................................................................................................................................................81
8.2 - Available options and accessories ..........................................................................................................................................81
8.3 - Checks before start of unit ......................................................................................................................................................81
8.4 - Checks during operation of unit...............................................................................................................................................82
8.5 - Maintenance checks................................................................................................................................................................82
CONTENTS

3
FIGURES CONTENT
Figure 1: Transport conguration.......................................................................................................................................................20
Figure 2: O󰀪oading conguration .....................................................................................................................................................20
Figure 3: Forklift position ..................................................................................................................................................................20
Figure 4 : How to remove front panel for 4 to 10 units ......................................................................................................................21
Figure 5 : How to remove front panel for 12 and 14 units .................................................................................................................22
Figure 6 : Water connection on unit...................................................................................................................................................24
Figure 7: Typical diagram of the hydraulic circuit .............................................................................................................................. 25
Figure 8: Hydraulic module equipped with variable speed single pump low available pressure....................................................... 26
Figure 9: Power supply connection ...................................................................................................................................................27
Figure 10: Password screen..............................................................................................................................................................35
Figure 11: Electrical connection of remote interface..........................................................................................................................39
Figure 12: Electrical connection of OAT sensor ................................................................................................................................42
Figure 13: Winter position for unit with hydraulic module.................................................................................................................. 55
Figure 14: Operation of booster and backup..................................................................................................................................... 56
Figure 15: Activation and conguration for drying mode ...................................................................................................................59
TABLES CONTENT
Table 1: Minimum and maximum wire section (per phase) for connection to NXHP units ................................................................ 28
Table 2: Steps to clean, purge, and dene a ow rate for hydraulic circuit .......................................................................................30
Table 3: Actions in WUI parameter menu or Service tools to activate the cleaning purge and control of ow rate for hydraulic circuit .. 31
Table 4: Di󰀨erent operating modes....................................................................................................................................................49
Table 5: Possible switches to install on system.................................................................................................................................50
Table 6: Alarms listing........................................................................................................................................................................66
The illustrations in this document are for illustrative purposes only and not part of any o󰀨er for sale or contract. The manufacturer reserves the right to change the design
at any time without notice.

4
Acronyms
IAT Indoor Air Temperature
BPHE Brazed Plate Heat Exchanger
CHWS Chiller Water System
DHW Domestic Hot Water
EHS Electric Heater Stage
EWT Entering Water Temperature
FCU Fan Coil Unit
LWT Leaving Water Temperature
NHC New Hydraulic Control (refer to wiring diagram 'Main control card')
OAT Outdoor Air Temperature
PMV Pulse Modulating Valve
SHC Space Heating / Cooling Control
TR Refrigerant Temperature
UFC Underoor Cooling
UFH Underoor Heating
WUI Wall-mounted User Interface
Control Conguration Legend
Steps Table Par. Designation Description Range Default Ex. Unit
Number of
parameter
Value by Default
of parameter
Unit of
parameter
Description of di󰀨erent value
which can take the parameter
Di󰀨erent steps to be done
to congure the unit
Name of the table to be
used in Customer Com. Bus
Name of parameter to be
used in Customer Com. Bus
Value given in example and
adapted at the described case
Range of
parameter
Possible to congure by direct access on WUI. Refer to WUI end user Manual.
Check to be done
Advanced Conguration Level (for basic operation no need to modify the setting)
ACRONYMS AND LEGEND

5
Standard installation Legend
Label Symbol Designation Notes
- Device Field supplied
-
Acc
Accessory Field mounted
-
Acc
Option Factory mounted
- Balancing valve Field supplied
Balancing to adjust the water ow rate
- Stop valve Field supplied
-Automatic Air vent
Field supplied
Automatic air vent outside of building on the exit
side of the unit
Add EXP-T Additional expansion tank
Field supplied
Expansion tank depending on the total
water loop volume
- Boiler Boiler used to boost or backup the heat pump
for comfort
EH1 & EH2 Electrical Heater (1 or 2)
Electrical heaters up to two with a max. stages
up to 3
Used to boost or backup the heat pump for
comfort
EH3
EH3
DHW-Electrical Heater Backup (1 stage)
Domestic Hot Water Electrical Heater - one
stage used to backup DHW (when condtions
are out of heat pump map)
DHW-T Domestic Hot Water - Tank Field supplied
DHW-S Domestic Hot Water - Sensor Accessory to mount on top of the DHW-Tank
Measure DHW-Temperature
DHW-V
B
AB
A
Domestic Hot Water - Valve or Diverting
valve
Accessory to be eld mounted, it will position
the valve to send either to comfort loop or
DHW-T, the processed water
add_pmp Additional Water Pump Field Supplied, it is used for comfort loop as a
secondary loop
De-Coupling
Tank De-Coupling Tank
Field Supplied, it is used to connect di󰀨erent
water loop rates as well as to receive the boiler
loop
Backup-EH
EH1 EH2
Backup electrical heater
Field Supplied, it is used for comfort loop as a
Booster Heater (HP+EH) or Backup (EH only)
when HP is out of the map.
- Flexible Field supply, it is used to lower vibrations
transmissions if necessary
HTSS
HTSS
T>Tmax High Temperature Safety Switch Field supplied, use to stop system when UFH
max, water temperature is triggered
ACRONYMS AND LEGEND

6
1 - INTRODUCTION
1.1 - Introduction
Prior to the initial start-up of the NXHP units, the
people involved should be thoroughly familiar with
these instructions and technical data for the
installation.
The instaler must conduct his own risk analysis
before starting the installation of this unit.
The NXHP outdoor systems are designed to
provide a very high level of safety and reliability
making installation, start-up, operation and
maintenance easier and more secure. They will
provide safe and reliable service when operated
within their application range.
They are designed for an operating life of 15 years
by assuming a 75% utilisation factor; that is
approximately 100,000 operating hours.
The procedures in this manual are arranged in
the sequence required for machine installation,
start-up, operation and maintenance.
Be sure you understand and follow the procedures
and safety precautions contained in the instructions
supplied with the machine, as well as those listed
in this guide, such as: protective clothing such as
gloves, safety glasses, safety shoes and
appropriate tools, and suitable qualifications
(electrical, air conditioning, local legislation).
To find out, if these products comply with
European directives (Machinery, low voltage,
electromagnetic compatibility, pressure
equipment, etc.) check the declarations of
conformity for these products.
1.2 - Safety
General warning: this unit uses very pure propane
as a refrigerant. Do not try to replace the
refrigerant with domestic propane. In the event
of a leak, refrigerant and air mixture may form a
ammable atmosphere. Any ignition source, such
as open amme, hot surfaces (Above 370°C) or
any device potentially source of electric arc
(sockets, electrical switches, static discharge, ...)
must be kept at least one meter distance from
the unit.
Take protective measures to prevent all
electrostatic discharges.
ISO 7010-
W021
(2011-05) Flammable
material
Warning relative to the
association of
ammable material
and propane
refrigerant
ISO 7010-
P003 No open
ame
Do not smoke, use
ignition source
material or open
amme near the unit
ISO 7000-
1659
(2004-01)
Read
service
manual
Read and understand
service and technical
documents relative to
the unit
ISO 7000-
0790
(2004-01)
Read
operator's
manual
Read and understand
operator's manual
before the power up of
the unit
ISO 7010-
W012
Electricity
hazard
Death or serious injury
can be caused by the
unit under tension,
always make sure to
service the unit
without power or
wearing the proper
safety equipement
ISO 7010-
W017
Hot surface
Serious injury can be
caused by di󰀨erents
hot surfaces present
close to the unit,
always make sure to
service the unit o󰀨 or
wearing the proper
safety equipement

7
1.2.1 - Installation safety considerations
After the unit has been received, and before it is
started up, it must be inspected for damage. Check
that the refrigerant circuits are intact, especially
that no components or pipes have shifted or been
damaged (e.g. following a shock). If in doubt, carry
out a leak tightness check. If damage is detected
upon receipt and before signature, immediately
le a claim with the shipping company.
In case of damage, carry out a leak detection test
before removing the cardboard box.
The unit must be stored outside or in a controled
environment (R290 sensors and non ignition
source area).
The units can not be stacked.
The unit must be installed outdoors following
clearance from §1.4.2. A minimum distance of one
meter around the unit must be cleared of any
obstacles for safe use.
This appliance can be used by children aged from
8 years and above and persons with reduced
physical, sensory or mental capabilities or lack of
experience and knowledge if they have been given
supervision or instruction concerning use of the
appliance in a safe way and understand the
hazards involved.
Children shall not play with the appliance.
Cleaning and user maintenance shall not be made
by children without supervision.
Do not remove the pallet or the packaging
until the unit is in its nal position. These units
can be moved with a fork lift truck, as long as
the forks are positioned in the right place and
direction on the unit see gure 3.
The units can also be lifted with slings (refer to
Figure 1 and 2).
Use slings with the correct capacity, and
always follow the lifting instructions on the
certied drawings supplied for the unit.
The coil of this unit can reach a temperature
above 50 °C and can present a burn risk.
The water pipings can also reach temperatures
up to 75 °C and be a source of burn if touched.
Safety is only guaranteed, if these instructions
are carefully followed. If this is not the case,
there is a risk of material deterioration and
injuries to personnel.
DO NOT COVER ANY PROTECTION DEVICES.
This applies to relief valves and rupture disks
in the refrigerant or heat transfer medium
circuits. Check if the original protection plugs
are still present at the valve outlets. These
plugs are generally made of plastic and
should not be used. If they are still present,
please remove them. Install devices at the
valve outlets or drain piping that prevent the
penetration of foreign bodies (dust, building
debris, etc.) and atmospheric agents (water
can form rust or ice).
These devices, as well as the drain piping,
must not impair operation and not lead to a
pressure drop that is higher than 10% of the
control pressure.
Control
When the unit is subjected to re, the uid may
then be decomposed into toxic residues when
subjected to the ame :
■Stay away from the unit as far as possible.
■Set up warnings and recommendations for
personnel in charge to stop the re.
■Make sure to precise that the unit contain
propane refrigerant as well as lubricant oil.
■Fire extinguishers appropriate to the system
and the refrigerant type must be easily
accessible.
All precautions concerning handling of
refrigerant must be observed in accordance
with local regulations.
Accumulation of refrigerant in an enclosed
space can displace oxygen and cause
asphyxiation or explosions.
1 - INTRODUCTION

8
1 - INTRODUCTION
Inhalation of high concentrations of vapour
is harmful and may cause heart irregularities,
unconsciousness, or death. Vapour is heavier
than air and reduces the amount of oxygen
available for breathing. These products cause
eye and skin irritation. Decomposition
products can be hazardous.
Short-circuit power (3-phase models only)
It is the responsibility of the installer or user
of the equipment to ensure, by consultation
with the distribution network operator if
necessary, that the equipment is connected
only to a supply with a short-circuit power Ssc
greater than or equal to 3,8 MVA.
1.2.2 - Pressurized equipment and
components
These products incorporate pressurized
equipment or components, produced by
manufacturers. We recommend that you consult
your appropriate national trade association or the
owner of the pressure equipment or component
(declaration, re-qualication, retesting, etc.). The
characteristics of this equipment/these
components are given on the nameplate or in the
required documentation, supplied with the
products.
The units are intended to be stored and operate
in an environment where the ambient temperature
must not be less than the lowest allowable
temperature indicated on the nameplate.
Do not introduce signicant static or dynamic
pressure with regard to the operating pressures
used during operation or for tests in the
refrigerant circuit or in the heat exchange
circuits.
NOTES:
Monitoring during operation, re-qualication,
re-testing, exemption from retesting:
■Follow local regulations on the monitoring
of pressure-containing equipment.
■The user or the operator is usually requested
to create and maintain a monitoring and
maintenance register.
■Follow the local professional
recommendations, whenever they exist.
■Regularly monitor the surface of the
components to detect cavernous corrosion.
To do this check an uninsulated part of the
pressure vessel or at a joint in the insulation.
■Regularly check for possible presence of
impurities (e.g. silicon grains) in the heat
exchange fluids. These impurities can
cause wear and/or pitting corrosion.
■Filter the heat exchange uid.
■The reports of the periodical checks by the
user or the operator must be included in the
monitoring and maintenance register.
REPAIR:
Any repair or modification of a pressure
vessel is prohibited.
Only the replacement of the vessel by an
original part from the manufacturer is allowed.
In this case, the replacement must be carried
out by a qualied technician. The replacement
of the vessel must be entered in the monitoring
and maintenance register.
RECYCLING:
The pressure equipment can be recycled in
whole or in part. After use they may contain
refrigerant vapours and oil residue. Some
parts are painted.

9
1.2.3 - Maintenance safety considerations
Professional technicians working on the electric
or refrigeration components must be authorized,
trained and fully qualied to do so.
All refrigerant circuit work must be carried out by
a trained person, fully qualied to work on these
units. The operator must have been trained and
be familiar with the equipment and the installation.
All welding operations must be carried out by
qualied specialists.
The units use R-290 refrigerant (propane). The
unit operating pressure is above 20 bar when the
outside air temperature is 35 °C.
Be aware that the refrigerant does not contain an
odour.
Special equipment must be used when working
on the refrigerant circuit (pressure gauge,
recovery unit, vaccum pump, etc.).
Equipment must be compatible with the use of
R-290.
Do not clean the unit with hot water or steam.
This may cause a pressure increase of the
refrigerant.
Do not use means to accelerate the defrosting
process or to clean, other than those
recommended by the manufacturer.
Any manipulation (opening or closing) of a
shut-off valve must be carried out by a
qualied and authorised technician, observing
applicable standards (e.g. during draining
operations). The unit must be switched off
while this is done.
During any handling, maintenance and service
operations the qualied technician working on
the unit must be equipped with safety gloves,
safety glasses, shoes and protective clothing.
Personal protective equipment (PPE)
Operation
Manutention Maintenance,
service
Welding,
brazing
Hand protection (gloves), eye protection
(safety googles), foot protection (safety
shoes), clothing protection
X X X
Ear protection X X
Filtering respirator X
Never work on a unit that is still energized.
Never work on any of the electrical components,
until the general power supply to the unit has
been cut.
If any maintenance operations are carried out
on the unit, lock the power supply circuit in
the open position and secure the machine
upstream with a padlock.
If the work is interrupted, always ensure that
all circuits are still de-energized before
resuming the work.
CAUTION:
Even if the unit has been switched o, the
power circuit remains energized, unless the
unit or customer circuit disconnect switch is
open. Refer to the wiring diagram for further
details. Attach appropriate safety labels. When
working in a fan area, specically if the grilles
have to be removed, isolate the power supply
to the fans to prevent their operation.
1 - INTRODUCTION

10
CAUTION:
The variable frequency drives (VFD) tted to
the units have circuit capacitors whose
discharge time is five (5) minutes after
disconnecting the power supply.
Therefore, after disconnecting the power
supply of the control box, wait for 5 minutes
before access it.
Before any intervention, verify that there is
no voltage present at any accessible
conducting parts of the power circuit.
Moreover be careful of contact with zones at
hot temperature inside the unit, which can
exist after the operation of unit (refrigerant,
electronic parts, compressor and water
piping).
Risk of fatal injury from magnetic eld for
people with medical implants (e.g. pacemakers)
due to permanent magnets installed in the
pump or the fan motor.
Follow the general behavioural guidelines that
apply to handling electrical devices!
The fan or pump motors must never be
disasembled.
The presence of oil at the outlet orice of the
Schrader valve is a useful indicator that
refrigerant has leaked. Keep this orice clean
to ensure that any leaks can be easily detected
OPERATING CHECKS:
■IMPORTANT INFORMATION REGARDING
THE REFRIGERANT USED:
Refrigerant type: R-290
Global Warming Potential (GWP): 3
Periodic inspections for refrigerant leaks may
be required depending on European or local
legislation. Please contact your local dealer
for more information.
Damage limitation
accessory(1) in case
of an external re
Refrigerant side
Internal relief valve (2) X
Heat transfer uid side
External relief valve (3)
(1) Classied for protection in abnormal service situations.
(2) The instantaneous over-pressure limited to 10% of the operating pressure does
not apply to this abnormal service situation. The control pressure can be higher
than the service pressure. In this case the design temperature ensures that the
service pressure is not exceeded in normal service situations.
(3) The classication of these relief valves must be made by the personnel that
completes the whole hydraulic installation.
CAUTION:
1. Any intervention on the refrigerant circuit
of this product should be performed in
accordance with the applicable legislation.
In the EU, the regulation is called F-Gas.
2. Ensure that the refrigerant is never released
to the atmosphere during installation,
maintenance or equipment disposal.
3. The deliberate gas release into the
atmosphere is not allowed.
4. If a refrigerant leak is detected, ensure that
it is stopped and repaired as quickly as
possible.
5. Only a qualied and certied personnel can
perform installation operations,
maintenance, refrigerant circuit leak test
as well as the equipment disposal and the
refrigerant recovering.
6. The gas recovery for recycling, regeneration
or destruction is at customer charge.
1 - INTRODUCTION

11
7. Periodic leak tests have to be carried out by the customer or by third parties. The EU
regulation set the periodicity here after:
System WITHOUT
leakage detection No Check 12 Months 6 Months 3 Months
System WITH leakage
detection No Check 24 Months 12 Months 6 Months
Refrigerant charge/
circuit (CO2 equivalent) < 5 Tons 5 ≤ Charge < 50 Tons
50 ≤ Charge <
500 Tons
Charge >
500 Tons(1)
Refrigerant
charge/
Circuit (kg)
R134A
(GWP 1430) Charge < 3,5 kg 3,5 ≤ Charge < 34,9 kg
34,9 ≤ Charge <
349,7 kg
Charge > 349,7
kg
R407C
(GWP 1774) Charge < 2,8 kg 2,8 ≤ Charge < 28,2 kg
28,2 ≤ Charge <
281,9 kg
Charge >
281,9 kg
R410A
(GWP 2088) Charge < 2,4 kg 2,4 ≤ Charge < 23,9 kg
23,9 ≤ Charge <
239,5 kg
Charge > 239,5
kg
R-290 No requirement
(1) From 01/01/2017, units must be equipped with a leakage detection system
8. A logbook must be established for
equipments subject to periodic leak tests.
It should contain the quantity and the type
of fluid present within the installation
(added and recovered), the quantity of
recycled uid, regenerated or destroyed,
the date and output of the leak test, the
designation of the operator and its
belonging company, etc.
9. Contact your local dealer or installer if you
have any questions.
Protection device checks:
■If no national regulations exist, check the
protection devices : every ve years for
external relief valves.
NOTE: The following statements are only
indicated if a pressure switch is available on
the unit.
The company or organisation that conducts a
pressure switch test shall establish and implement
a detailed procedure to x:
■Safety measures
■Measuring equipment calibration
■Validating operation of protective devices
■Test protocols
■Recommissioning of the equipment.
Consult Service for this type of test. The
manufacturer mentions here only the principle of
a test without removing the pressure switch:
■The pressure switch test must always be
carried out with all the panels closed.
■Verify and record the setpoints of pressure
switches and relief devices (valves and possible
rupture discs)
■Be ready to switch-o󰀨 the main disconnect switch
(on the unit or on the installation) of the power
supply if the pressure switch does not trigger
(avoid over-pressure)
■Connect a calibrated pressure gauge (with
Schrader female port of ½ UNF)
CAUTION:
Inspect the protection devices such as valves.
If the machine operates in a corrosive
environment, inspect the protection devices
more frequently.
Check regularly for leaks and repair
immediately. Ensure regularly that the
vibration levels remain acceptable and close
to those at the initial unit start-up.
1 - INTRODUCTION

12
Before opening a refrigerant circuit, transfer
the refrigerant to bottles specically provided
for this purpose and consult the pressure
gauges.
Change the refrigerant after an equipment
failure, following the procedure below. or
carry out a refrigerant analysis in a specic
laboratory.
If the refrigerant circuit remains open after an
intervention (such as a component
replacement, etc.):
■Seal the openings if the duration is less than
a day
■If more than 1 day, charge the circuit with
oxygen free nitrogen (inertia principle).
The objective is to prevent penetration of
atmospheric humidity and the resulting
corrosion.
1.2.4 - Repair safety considerations
All installation parts must be maintained by the
personnel in charge to avoid deterioration and
injury. Faults and leaks must be repaired
immediately. The authorized technician must
have the responsibility to repair the fault
immediately. After each unit repair check the
operation of the protection devices and create a
100% parameter operation report.
Comply with the regulations and recommendations
in unit and HVAC installation safety standards.
If the supply cord is damaged, it must be
replaced by the manufacturer, its service
agent or similarly qualied persons in order
to avoid a hazard.
RISK OF EXPLOSION
Never use air or a gas containing oxygen
during leak tests to purge lines or to pressurise
a machine. Pressurised air mixtures or gases
containing oxygen can be the cause of an
explosion. Oxygen reacts violently with oil
and grease.
Only use dry nitrogen for leak tests, possibly
with an appropriate tracer gas.
If the recommendations above are not
observed, this can have serious or even fatal
consequences and damage the installation.
Never exceed the specified maximum
operating pressures. Verify the allowable
maximum high- and low-side test pressures
by checking the instructions in this manual
and the pressures given on the unit name
plate.
Do not unweld or amecut the refrigerant lines
or any refrigerant circuit component until all
refrigerant (liquid and vapour) as well as the
oil have been removed from the heat pump.
Traces of vapour should be displaced with
dry nitrogen. Refrigerant in contact with an
open ame can produce toxic gases or an
explosion.
The necessary protection equipment must be
available, and appropriate re extinguishers
for the system and the refrigerant type used
must be within easy reach.
Do not siphon refrigerant.
Do not store any ammable material at less
than one meter of the unit.
Avoid spilling liquid refrigerant on skin or
splashing it into the eyes. Use safety goggles
and safety gloves. Wash any spills from the
skin with soap and water. If liquid refrigerant
enters the eyes, immediately and abundantly
ush the eyes with water and consult a doctor.
1 - INTRODUCTION

13
The accidental releases of the refrigerant, due
to small leaks or significant discharges
following the rupture of a pipe or an unexpected
release from a relief valve, can cause frostbites
and burns to personnel exposed. Do not
ignore such injuries. Installers, owners and
especially service technicians for these units
must:
■Seek medical attention before treating such
injuries.
■Have access to a rst-aid kit, especially for
treating eye injuries.
Make sure that all the heat or cold generator
on the water loop are turned off before any
intervention on the water loop.
Never apply an open ame or live steam to a
refrigerant circuit. Dangerous overpressure
can result.
During refrigerant removal and storage
operations follow applicable regulations.
These regulations, permitting conditioning
and recovery of halogenated hydrocarbons
under optimum quality conditions for the
products and optimum safety conditions for
people, property and the environment are
described in every applicable standard. The
units must never be modied to add refrigerant
and oil charging, removal and purging
devices. All these devices are provided with
the units.
Refer to the certied dimensional drawings
for the units.
It is dangerous and illegal to re-use disposable
(non-returnable) cylinders or attempt to rell
them. When cylinders are empty, evacuate the
remaining gas pressure, and move them to a
designated place for recovery. Do not
incinerate.
Do not attempt to remove refrigerant circuit
components or ttings, while the machine is
under pressure or while it is running. Be sure
pressure is at 0 kPa and that the unit has been
shut-down and de-energised before removing
components or opening a circuit.
Do not attempt to repair or recondition any
safety devices when corrosion or build-up of
foreign material (rust, dirt, scale, etc.) is found
within the valve body or mechanism. If
necessary, replace the device. Do not install
safety valves in series or backwards.
CAUTION:
No part of the unit must be used as a walkway,
rack or support. Periodically check and repair
or if necessary replace any component or
piping that shows signs of damage.
Do not step on refrigerant lines. The lines can
break under the weight and release refrigerant,
causing personal injury.
Do not climb on a machine. Use a platform,
or staging to work at higher levels.
Use mechanical lifting equipment (crane,
hoist, winch, etc.) to lift or move heavy
components. For lighter components, use
lifting equipment when there is a risk of
slipping or losing your balance.
Use only original replacement parts for any
repair or component replacement. Consult the
list of replacement parts that corresponds to
the specication of the original equipment.
Do not drain water circuits containing
industrial brines, without informing the
technical service department at the installation
site or a competent body rst.
Close the entering and leaving water shut-o
valves and purge the unit hydraulic circuit,
before working on the components installed
on the circuit (screen lter, pump, water ow
switch, etc.).
1 - INTRODUCTION

14
Periodically inspect all valves, ttings and
pipes of the refrigerant and hydraulic circuits
to ensure that they do not show any corrosion
or any signs of leaks.
It is recommended to wear ear protections,
when working near the unit and the unit is in
operation.
Always ensure you are using the correct
refrigerant type before recharging the unit.
Charging any refrigerant other than the
original charge type (R-290) will impair
machine operation and can even lead to a
destruction of the compressors. The
compressors operate with R-290 and are
charged with mineral oil.
Before any intervention on the refrigerant
circuit, the complete refrigerant charge must
be recovered.
The machine is operated from the human
machine interface.
The maintenance is done in the following
position (schéma avec technicien sur le côté
de la machine).
1.3 - Preliminary checks
Check equipment received :
■Inspect the unit for damage or missing parts. If damage is
detected, or if shipment is incomplete, immediately le a claim
with the shipping company.
■ Conrm that the unit received is the one ordered. Compare the
name plate data with the order.
■ The name plate is attached to the unit in two locations:
-on the outside on one of the unit sides
■ The unit name plate must include the following information:
-Model number - size
-CE marking
-Serial number
-Year of manufacture, pressure and leaktightness test date
-Fluid being transported
-Refrigerant used
-Refrigerant charge per circuit
-PS: Min./max. allowable pressure (high and low pressure
side)
-TS: Min./max. allowable temperature (high and low pressure
side)
-Unit leak test pressure
-Voltage, frequency, number of phases
-Maximum power input
-Unit net weight
■ Conrm that all options ordered for on-site installation have
been delivered, and are complete and undamaged.
The unit must be checked periodically, if necessary removing
the insulation (thermal, acoustic), during its whole operating
life to ensure that no shocks (handling accessories, tools,
etc.) have damaged it. If necessary, the damaged parts must
be repaired or replaced. See also chapter §5. Maintenance.
Always make sure that all the panels of the unit are close before
powering up the unit (fan grid, top panel and compressor side panels).
B
C
D
D
C
B
Legend:
BAir inlet
CFan grid
DNameplate
1 - INTRODUCTION

15
1.4 - Dimensions and clearance for NXHP 4-14 units
1.4.1 - Dimensions and location of hydraulic connections
A
J
H
G
D
E
C
IF
B
B
C
D
B
Water inlet
C
Water oulet
D
Draining water pipe
A
J
H
G
D
F
E
C
I
F
B
B
C
D
B
Water inlet
C
Water oulet
D
Draining water pipe
NXHP A B C D E F G H I J
004 946 927 372 71 341 485 93 150 400 600
006 946 927 372 71 341 485 93 150 400 600
008 946 927 372 71 341 485 93 150 400 600
010 946 927 372 71 341 485 93 150 400 600
012 946 1375 372 83 553 720 102 160 400 600
014 946 1375 372 83 553 720 102 160 400 600
NOTE: Dimensions are given in mm
1 - INTRODUCTION

16
1.4.2 - Clearances to ensure the correct air ow
The picture presents the minimal distances of the wall to ensure the correct air ow on air heat exchanger(1).
The unit should also be kept one meter away from any opening (doors, windows...).
The unit shall not be installed so that, in the event of a leak, the refrigerant may accumulate or stagnate (propane is heavier than air).
150
500
1000
1000
150150 800800 800
200
1000
800
200
800
1000
000200510001 200
300
150
200
008051
500
1000 150
(1) Anticipate di󰀨erent maintenance actions before to place the unit (access of di󰀨erent parts / opening of panel/ part replacement…)
1 - INTRODUCTION

17
1.5 - Physical data and electrical data of NXHP units
1.5.1 - Physical data NXHP 4-14
NXHP
004
(1Ph)
006
(1Ph)
008
(1Ph)
010
(1Ph)
012
(1Ph)
014
(1Ph)
012
(3Ph)
014
(3Ph)
Sound levels
Standard unit
Sound power level (2) dB(A) 49 50 51 51 54 54 54 54
Sound pressure level at 5 m (3) dB(A) 23,5 24,5 25,5 25,5 28,0 28,0 28,0 28,0
Dimensions
Length mm 946 946 946 946 946 946 946 946
Width mm 430 430 430 430 430 430 430 430
Height mm 927 927 927 927 1375 1375 1375 1375
Operating Weight (1)
Standard unit kg 78 84 91 93 126 126 128 128
Compressors Rotary
compressor 11111111
Refrigerant R290
Charge (1) kg 0,39 0,58 0,76 0,76 1,07 1,07 1,07 1,07
Capacity control
Minimum capacity (5) % 40% 32% 34% 27% 25% 21% 25% 21%
Air Heat Exchanger Grooved copper tubes, aluminium ns
Fans Axial type
Quantity 1 1 1 1 2 2 2 2
Maximum total air ow l/s 800 800 800 800 1800 1800 1800 1800
Maximum rotational speed rpm 730 730 820 820 820 820 820 820
Water Heat Exchanger Brazed plate heat exchanger
Water volume l 0,6 0,9 0,9 0,9 1,5 1,5 1,5 1,5
Hydraulic module Circulator, relief valve, paddle ow switch
Circulator Centrifugal pump (variable speed)
Max. water-side operating pressure (4) kPa 300 300 300 300 300 300 300 300
Water connections
Inlet diameter (BSP GAS) inch 1 1 1 1 1 1 1 1
Outlet diameter (BSP GAS) inch 1 1 1 1 1 1 1 1
Chassis paint colour Colour code: RAL
7035
RAL
7035
RAL
7035
RAL
7035
RAL
7035
RAL
7035
RAL
7035
RAL
7035
(1) Values are guidelines only. Refer to the unit nameplate.
(2) In dB ref=10-12 W, (A) weighting. Declared dualnumber noise emission values in accordance with EN 12102-1 (with an associated uncertainty of +/-2dB(A)) as required
by Ecodesign regulation and Eurovent certication. Measured in accordance with ISO 9614-1 at ErP C condition (A7/W55)
(3) In dB ref 20 μPa, (A) weighting. Declared dualnumber noise emission values in accordance with EN 12102-1 (with an associated uncertainty of +/-2dB(A)). For information,
calculated from the sound power level Lw(A) at ErP C condition (A7/W55).
(4) Min. water-side operating pressure with variable speed hydraulic module is 110 kPa.
(5) Heating Eurovent condition
1.5.2 - Electrical data NXHP 4-14
NXHP
004
(1Ph)
006
(1Ph)
008
(1Ph)
010
(1Ph)
012
(1Ph)
014
(1Ph)
012
(3Ph)
014
(3Ph)
Power circuit
Nominal power supply V-ph-Hz 230-1+N-
50
230-1+N-
50
230-1+N-
50
230-1+N-
50
230-1+N-
50
230-1+N-
50
400-3+N-
50
400-3+N-
50
Voltage range V 220-240 220-240 220-240 220-240 220-240 220-240 380-415 380-415
Control circuit supply 24V AC via internal transformer
Maximum unit power input (Un) (1) kW 3,5 4,4 5,0 6,4 7,1 7,1 10,5 10,5
Cos Phi unit at maximum power (1) 1,00 1,00 1,00 1,00 1,00 1,00 0,94 0,94
Maximum unit current drawn (Un-10%) (2) A15,3 19,4 21,8 28,2 31,0 31,0 16,3 16,3
Maximum unit current drawn (Un) (3) A15,1 19,2 21,6 27,9 30,8 30,8 16,1 16,1
Maximum Start-up current, standard unit (4) ANot Applicable (less than the operating current)
(1) Power input, compressors and fans, at the unit operating limits and nominal voltage (data given on the unit nameplate).
(2) Maximum unit operating current at maximum unit power input and at 207 or 360 V.
(3) Maximum unit operating current at maximum unit power input and at 230 or 400 V (values given on the unit nameplate).
(4) Maximum instantaneous start-up current at operating limits (maximum operating current of the smallest compressor(s) + fan current + locked rotor current of the largest
compressor).
.
1 - INTRODUCTION

18
1.5.3 - Inside view
B
B
B
1Ph Electricl Box 004 – 010 012 – 014
C
C
3Ph Electricl Box 012 - 014
1 - INTRODUCTION

19
1.6 - Accessories
Accessories Description Advantages
Flexible hydraulic tubes Tubes are used to decoupling hydraulic circuits and the
units Reduces vibration transmission to hydraulic installation
Anti-vibration mounts Cushion installed under the unit to avoid vibration
trasmission Reduces vibration transmission
Remote human interface Remotely installed user interface
Remote heat pump control with room temperature
sensor used to o󰀨set the water control point.
Possibility to congure the unit on eld.
Additional outdoor ambient
temperature sensor Additional outdoor ambient temperature sensor Better reading of outdoor air temperature
Drain panel heater Electrical heater to prevent condensate freezing (base
panel and drain duct) Condensates proper evacuation for cold climate
Master / Slave sensor
Unit equipped with supplementary water outlet
temperature sensor kit to be eld-installed allowing
master/slave operation of two to four units connected in
parallel
Optimised operation of chillers connected in parallel
with operating time equalisation
Domestic Hot Water 3 way
valve Solenoid valve for domestic hot water production Useful for domestic hot water production
Water lling kit System enabling to ll the hydraulic circuit including:
ball valve, check valve, pressure gauge hydraulic circuit easy lling
Installlation kit
Package for basic installation including:
Anti-vibration mounts, exible hydraulic tubes, valves,
lter, antifreeze valve, lling kit
Ease installation providing common necessary
accessories
1 - INTRODUCTION

20
2 - INSTALLATION OF UNIT
2.1 - General
To install an unit NXHP 4-14 the following steps are requested
1. Place the unit
2. Make hydraulic connections to ll the system with water or
brine uid
3. Make electrical connections
4. Check for water leaks and the water ow rate control
5. Verify that al the panels are in place and tightly secured in
place. Make sure that the fan blade protection is installed and
locked in place
6. Finally, make commissioning of the unit
2.2 - Moving and placing the unit
2.2.1 - Moving
See §1.2.1 Installation safety considerations.
Figure 1: Transport conguration
In the case of manual lifting of the unit, it is needed at least three
(3) persons for the 004 - 010 units and four (4) persons for the
012 - 014 units. In both situations, at least one person must lift
the fan side and the others must lift the compressor side. This
conguration permits to limit the load per lifter to 40 kg.
Figure 2: Ofoading conguration
CAUTION: The lifting sling must always slide through the feet.
Figure 3: Forklift position
2.2.2 - Placing the unit
In case of extra-high units the machine environment must
permit easy access for maintenance operations.
Always refer to § 1.4. Dimensions and clearances to conrm
that there is adequate space for all connections and service
operations. For the centre of gravity coordinates, the position
of the unit mounting holes, and the weight distribution points,
refer to the certied dimensional drawing supplied with the
unit.
Typical applications of these units do not require earthquake
resistance. Earthquake resistance has not been veried.
CAUTION:
Only use slings at the designated lifting points (refer to Figure
2 to ooad the unit).
Before siting the unit check that:
■The permitted loading at the site is adequate or that appropriate
strengthening measures have been taken.
■If the unit has to operate as a heat pump in temperatures below
0°C it must be raised at least 300 mm from the ground. This is
necessary to avoid ice build-up on the unit chassis and also to
permit correct unit operation in locations where the snow level
may reach this height.
■The unit is installed level on an even surface (maximum
tolerance is 5 mm in both axes).
■There is adequate space above the unit for air ow and to
ensure access to the components (see dimensional drawings).
■The number of support points is adequate and that they are in
the right places.
■ It is mandatory to use 4 (four) bolts with su󰀩cient strength in
the 4 (four) foot holes
■ The location is not subject to ooding.
■ For outdoor installations, where heavy snowfall is likely and
long periods of sub-zero temperatures are normal, provision
has to be made to prevent snow accumulating by raising the
unit above the height of drifts normally experienced. Ba󰀪es
may be necessary to deect strong winds. They must not restrict
air ow into the unit.
■ OAT sensor, located on the coil, should not be exposed to the
sun or other heat sources.
■ If the unit is installed must be install above the ground, always
make sure to use adapted wall brackets and verify that the
weight allowed is higher than the unit weight.