Airwell HRW Series Manual

English
IOM HRW 02-N-11GB
Part number / Code / Teil Nummer / Codice / Código : 3990404GB
Supersedes / Annule et remplace / Annulliert und ersetzt /
Annulla e sostituisce / Anula y sustituye : IOM HRW 02-N-10GB
Français EspañolDeutsch Italiano
Installation and maintenance manual
Manuel d’installation et de maintenance
Installations- und Wartungshandbuch
Manuale di installazione e di manutenzione
Manual de instalación y de mantenimiento
IOM HRW 02-N-11
Part number / Code / Teil Nummer / Codice / Código : 3990404
Supersedes / Annule et remplace / Annulliert und ersetzt /
Annulla e sostituisce / Anula y sustituye : IOM HRW 02-N-10
WATER SOURCE HEAT PUMP
POMPE A CHALEUR SUR BOUCLE D’EAU
WÄRMEPUMPE AN WASSERSCHLEIFE
POMPA DI CALORE SU CIRCUITO DI ACQUA
BOMBA DE CALOR EN CIRCUITO DE AGUA
HRW
1.9
Ü
3 kW
2.6
Ü
3.7 kW
07 ÷ 12

INSTALLATION INSTRUCTION
NOTICE D’INSTALLATION
INSTALLATIONSHANDBUCH
ISTRUZIONI INSTALLAZIONE
INSTRUCCIONES DE INSTALACIÓN

2
CONTENTS
GENERAL RECOMMENDATIONS ...............................................................................................................3
SAFETY DIRECTIONS................................................................................................................................................................ 3
WARNING ............................................................................................................................................................................... 3
INSPECTION AND STORAGE.....................................................................................................................4
GENERALITIES...........................................................................................................................................4
CONTENTS OF PARCEL .............................................................................................................................4
DIMENSIONS ............................................................................................................................................5
HANDLING ...............................................................................................................................................5
NET WEIGHT ........................................................................................................................................................................... 5
TECHNICAL SPECIFICATIONS....................................................................................................................6
OPERATING LIMITS .................................................................................................................................................................. 6
ENVIRONMENT ......................................................................................................................................................................................... 6
TEMPERATURE LIMITS................................................................................................................................................................................. 6
FLOW LIMITS ............................................................................................................................................................................................. 6
ÉLECTRIC SPÉCIFICATIONS .......................................................................................................................7
ELECTRICAL POWER SUPPLY..................................................................................................................................................... 7
INSTALLATION ..........................................................................................................................................7
UNIT LOCATION ..................................................................................................................................................................... 7
DUCTING AND NOISE LEVEL REDUCTION................................................................................................8
CONNECTION FRAME DIMENSIONS....................................................................................................................................... 9
AIR BLOWING FRAME................................................................................................................................................................................ 9
RETURN AIR INTAKE FRAME........................................................................................................................................................................ 9
MODIFYING THE AIR BLOWING DIRECTION.......................................................................................................................... 10
FILTER ACCESS....................................................................................................................................................................... 10
WITHOUT PLENUM.................................................................................................................................................................................. 10
WITH PLENUM......................................................................................................................................................................................... 10
VENTILATION......................................................................................................................................................................... 11
AERAULIC ADJUSTMENT ........................................................................................................................................................ 11
MODEL 07 .............................................................................................................................................................................................. 11
MODEL 09 .............................................................................................................................................................................................. 11
MODEL 12 .............................................................................................................................................................................................. 12
UNCLAMPING THE COMPRESSOR...........................................................................................................12
HYDRAULIC CONNECTIONS...................................................................................................................13
RECOMMENDATIONS FOR HYDRAULIC CONNECTIONS ....................................................................................................... 13
RECOMMENDATIONS FOR CLEANING AND FLUSHING OUT THE SYSTEM ............................................................................. 15
WIRING DIAGRAM AND LEGEND............................................................................................................16
WIRING DIAGRAM................................................................................................................................................................. 16
LEGEND ................................................................................................................................................................................ 16
POWER SUPPLY........................................................................................................................................................................................ 16
DESCRIPTION OF WIRING DIAGRAM REFERENCES................................................................................................................................... 16
PRESSOSTATS SETTINGS........................................................................................................................................................................... 17
COLOUR CODE...................................................................................................................................................................................... 17
ELECTRICAL CONNECTIONS...................................................................................................................17
GENERALITIES........................................................................................................................................................................ 17
RCL AND µBMS CONTROL MODULES WIRING........................................................................................18
RCL ....................................................................................................................................................................................... 18
µBMS..................................................................................................................................................................................... 20
APPLIANCE CONFIGURATION ............................................................................................................................................... 21
FACTORY CONFIGURATION.................................................................................................................................................................... 21
CLIENT SETTINGS.................................................................................................................................................................................... 21
RETURN AIR TEMPERATURE MEASUREMENT ............................................................................................................................ 22
POWER FAILURE..................................................................................................................................................................... 22
REMOTE ON/OFF MAKE/BREAK SWITCH................................................................................................................................ 22
RCL ONLY ............................................................................................................................................................................. 23
µBMS SUPERVISION MODULE ................................................................................................................................................ 23
MODBUS............................................................................................................................................................................... 24
ADDRESSING PROCEDURE .................................................................................................................................................... 25
µBMS SUPERVISION MODULE ................................................................................................................................................ 26
MOTORISED WATER VALVE..................................................................................................................................................... 27
FINAL TASKS ...........................................................................................................................................27
STARTING - RECOMMENDATIONS - SETTINGS .......................................................................................27
COMMISSIONING................................................................................................................................................................. 27
DEMAND FOR COOLING...................................................................................................................................................... 27
DEMAND FOR HEATING ........................................................................................................................................................ 28
MAINTENANCE AND SERVICING............................................................................................................29
FAULT FINDING ..................................................................................................................................................................... 29
NEITHER THE FAN NOR THE COMPRESSOR OPERATE............................................................................................................................... 29
VENTILATION (FAN) MODE OPERATES BUT THE COMPRESSOR DOES NOT OPERATE ............................................................................... 29
INSUFFICIENT COOLING OR HEATING PRODUCTION ............................................................................................................................ 30
INSUFFICIENT WATER FLOW AT THE LEVEL OF THE PLATE EXCHANGER..................................................................................................... 30
APPEARANCE OF WATER DROPLETS IN THE APPLIANCE............................................................................................................................ 30
APPEARANCE OF ABNORMAL NOISES AND VIBRATIONS IN THE CASING ................................................................................................. 30
ALARM CODES ...................................................................................................................................................................... 31
GENERAL CODES .................................................................................................................................................................................... 31
COOLING MODE ................................................................................................................................................................................... 31
HEATING MODE...................................................................................................................................................................................... 32
IN-WARRANTY RETURN MATERIAL PROCEDURE .....................................................................................33
SERVICE AND SPARE PARTS ORDER.........................................................................................................33

3
IT IS MANDATORY TO
CUTOFF POWER SUPPLY
BEFORE STARTING TO
WORK IN THE ELECTRIC
CASING BOXES
GENERAL RECOMMENDATIONS
Please read the following safety precautions very carefully before installing the unit.
SAFETY DIRECTIONS
Follow the safety rules in forces when you are working on your appliance.
The installation, commissioning and maintenance of these units should be performed by qualified personnel having
a good knowledge of standards and local regulations, as well as experience of this type of equipment.
The unit should be handled using lifting and handling equipment appropriate to the unit's size and weight.
Any wiring produced on site must comply with the corresponding national electrical regulations.
Make sure that the power supply and its frequency are adapted to the required electric current of operation, taking
into account specific conditions of the location and the current required for any other appliance connected with
the same circuit.
The unit must be EARTHED to avoid any risks caused by insulation defects.
It is forbidden to start any work on the electrical components if water or high humidity is present on the installation
site.
WARNING
Cutoff power supply before starting to work on the appliance.
When making the hydraulic connections, ensure that no impurities are introduced into the pipe work.
The manufacturer declines any responsibility and the warrantly becomes void if these instructions
are not respected.
If you meet a problem, please call the Technical Department of your area.
If possible, assemble the mandatory or optional accessories before placing the appliance on its final location. (see
instructions provided with each accessory).
In order to become fully familiar with the appliance, we suggest to read also our Technical Instructions.
The information contained in these Instructions are subject to modification without advance notice.

4
INSPECTION AND STORAGE
At the time of receiving the equipment carefully cross check all the elements against the shipping documents in
order to ensure that all the crates and boxes have been received. Inspect all the units for any visible or hidden
damage.
In the event of shipping damage, write precise details of the damage on the shipper’s delivery note
and send immediately a registered letter to the shipper within 48 hours, clearly stating the damage
caused. Forward a copy of this letter to the manufacturer or their representative.
Never store or transport the unit upside down. It must be stored indoors, completely protected from rain, snow etc.
The unit must not be damaged by changes in the weather (high and low temperatures). Excessively high temperatures
(above 60 °C) can harm certain plastic materials and cause permanent damage. Moreover, the performance of
certain electrical or electronic components can be impaired.
CONTENTS OF PARCEL
GENERALITIES
1 - To avoid any damage, this equipment must not be used to supply heating or cooling during building
work.
2 - Check that the voltage, the number of phases and the capacity of the unit comply with the installation
plans.
3 - Check the size of the unit in relation to the plans to ensure that the unit will be installed in the right
location.
4 - After having removed the packing box, take out the suspension kit that is to be found inside the fan
outlet frame.
5 - Before installing the unit, check its height in relation to the available free ceiling height.
6 - Take particular care over the location and routing of the water pipes and the condensate drainage
pipe as well as the electrical wiring. The location and routing of these items must be clearly indicated
on the plans.
7 - It is always advisable for the heat pump installer to consult with all the various entrepreneurs responsible
for the pipe work, partitioning, ceiling and electrical installation on the site.
8 - If necessary, change the direction of the airflow outlet from the front to the side of the appliance, or
vice versa, prior to installing the unit in the ceiling. Refer to the instructions detailed in the section «
AIRFLOW OUTLET MODIFICATION».
9 - We advise the installer to cover the appliances with a plastic sheet to protect it during the final building
work.
This is particularly important if work such as spraying the joists with fire retardant, sanding, spray
painting and plastering has not been completed.
Package contents:
1 appliance
1 suspension kit comprising:
²4 nuts
²4 locknuts
²4 shock mounts
²4 washers
1 installation manual

5
40,50 154
38,10
220 env
111,30
582
175
37.5
DIMENSIONS
HANDLING
NET WEIGHT
Ø1/2" FEMALE GAS
WATER OUTLET
Ø1/2" FEMALE
GAS WATER INLET
ELECTRICAL
CONNECTIONS
CONDENSATES OUTLET
FLEXIBLE HOSE Ø16mm
The appliance may be handled with a pallet truck or a forklift truck.
530
900
239
AIR FILTER
600x200x25
PRESSURE TAP
HP
PRESSURE TAP
BP
MODELS 07 09 12
WEIGTH WITH PLENUM Kg 52 52 52
WITHOUT PLENUM Kg 47 47 47

6
TECHNICAL SPECIFICATIONS
OPERATING LIMITS
ENVIRONMENT
This equipment is designed EXCLUSIVELY for INDOOR installation.
In general, sheltered locations such as garages, roof space, etc, do not provide sufficient protection against extreme
temperatures and/or humidity and may be harmful to the unit’s performance, reliability and service life.
Air = 440 m3/h Water = 418 l/hNominal flow
0
50
100
150
200
250
300
350
400
14
Air inlet temperature (°C)
Air flow (m3/h)
0
50
100
150
200
250
300
350
400
Water inlet temperature (°C)
Water flow (l/h)
15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42
Air = 520 m3/h Water = 511 l/h
50
100
150
200
250
300
350
400
14
50
100
150
200
250
300
350
400
15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42
450 450
500 500
Air inlet temperature (°C)
Air flow (m3/h)
Water inlet temperature (°C)
Water flow (l/h)
Nominal flow
Air = 650 m3/h Water = 698 l/h
125
175
225
275
325
375
425
475
14
150
200
250
300
350
400
450
500
15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42
525 550
575 600
625 650
Air inlet temperature (°C)
Air flow (m3/h)
Water inlet temperature (°C)
Water flow (l/h)
Nominal flow
Cooling Heating
Air inlet
temperature
Minimum 21 °C DB / 15 °C WB 15 °C
Normal * 27 °C DB / 19 °C WB 20 °C
Maximum 32 °C DB / 23 °C WB 27 °C
Water inlet
temperature
Minimum 18 °C 13 °C
Normal * 30 °C 20 °C
Maximum 42 °C 34 °C
TEMPERATURE LIMITS
FLOW LIMITS
DB: dry bulb WB:
bulbe humide
* Conditions in
accordance with the
standard:
EN 14511-2
MODEL 12
MODEL 09
MODEL 07

7
INSTALLATION
ÉLECTRIC SPÉCIFICATIONS
ELECTRICAL POWER SUPPLY
A variance of ±10% is acceptable in relation to the operating voltage marked on the appliance’s Maker’s Plate.
Operating voltages:
²230V / 1 ph / 50 Hz (207 Volts minimum; 253 Volts maximum.)
Comments: the stated voltages represent the accepted range. However, certain components may be subject to
premature wear on appliances operating continuously, for extensive periods, on abnormally low or high voltages.
UNIT LOCATION
1 - Install the unit in a location allowing easy removal of the filter and the access panels
to the electrical box/compressor and fan by leaving sufficient free space for servicing
personnel to perform maintenance
and repairs. Leave sufficient space
for the water, electricity and duct
connections.
2 - The installer must ensure that access
under the suspended ceiling is provided,
and that sufficient space is provided for
the suspension angle brackets, the duct
attachment collars and the water and
electrical connections.
3 - Provide space under the unit for a siphon
on the condensates drainage pipe. Do not
install the unit on top of pipe work.
4 - Each unit is suspended from the ceiling on
four threaded rods. The rods are attached through the shock mounts to the corners of the unit by
suspension angle brackets.
Warning! Do not use rods of a diameter smaller than that stated below. The rods must be solidly
anchored to the ceiling and to the ceiling joists.
5 - Each unit is supplied with a set of pre-fitted suspension angle brackets and a fitting kit contained in
the pouch with the technical manual. The kit comprises 4 shock mounts, 4 washers, 4 nuts and 4
locknuts.
6 - Arrange the threaded rods in accordance with the dimensions stated below. The use of nuts and
locknuts is recommended for attaching the suspension rods to the unit as the unit’s vibrations may
loosen a single nut. The installer is liable for any damage in the event of this recommendation not
being followed.
7 - To facilitate drainage, the unit must be angled in both planes towards the condensates drainage pipe.
(Slope minimum: 2 %)
M8 THREADED ROD
(NOT SUPPLIED))
SHOCK MOUNT
WASHER
NUT
LOCKNUT
453
593
893 39
39
600 mm
600 mm
600 mm
600 mm
200 mm

8
DUCTING AND NOISE LEVEL REDUCTION
Water circuit heat pumps are usually installed in conjunction with an air blowing duct. A return air duct may also
be required. All ductwork shall be compliant with best air conditioning engineering practices.
The air blowing duct system normally consists of a flexible connector mounted on the unit, a bridging section to
link to the size of the main duct, a short section of straight duct, an elbow without a damper and a main duct with
spurs equipped with distribution grilles as illustrated in the drawing below. The sum total of the bridging section
angles must not be higher than 30°, otherwise there will be significant performance losses.
Do not connect the main duct directly to the unit without a bridging section to reduce the duct size to that of the
unit’s connection collar. In the event of using metal ducts, only the sides of the elbow section and all the spur duct
sections should be covered with fibreglass sound insulation for reducing the noise level. Fibreglass duct panels are
more sound absorbent and may enable the flexible canvas connection to be eliminated.
The duct network must be laid out to avoid any rectilinear runs betweens the heat pump outlet and the air distribution
outlets.
The return air intake ducts can be connected to a grille/filter located at the base of a wall, then directed via hollow
partitions towards a ceiling mounted plenum or via ceiling mounted grilles. The ceiling grilles must not be located
directly below the air conditioning unit.
The return air intake duct can be connected directly to the standard filter bracket. (Lateral filter removal
advisable).
Do not drill panel screws directly into the unit’s casing for connecting the blowing and return air intake ducts,
especially on the air return side, as there is a risk of damaging the condensate recovery tray and the battery.
Recommended layout diagram for installation
with several air distribution outlets
Internal cladding on both sides with
glass fibre sound insulation
Adapter part Alignment elbow
Main duct
Canvas
connection
Heat pump Spur with internal glass fibre
sound insulation cladding
Air distributor:
60 x 60 cm (example)

9
RETURN AIR INTAKE
REAR BLOWING
IN LINE BLOWING
(STANDARD CONFIGURATION)
CONNECTION FRAME DIMENSIONS
AIR BLOWING FRAME
RETURN AIR INTAKE FRAME
225
118
236
118
Ø250mm
806,50
239
435
210,5
118
582
175
37.5
WITHOUT PLENUM
WITH PLENUM (OPTION)
RETURN AIR INTAKE
RETURN AIR INTAKE
(IN LINE) RETURN AIR INTAKE
(REAR)
REAR BLOWING
IN LINE BLOWING
(STANDARD CONFIGURATION)
AIR FILTER
600x200x25
FRESH AIR INTAKE
Ø100 OR Ø125
(option)

10
MODIFYING THE AIR BLOWING DIRECTION
The unit sizes 07 to 12 can be supplied configured for either frontal air blowing, known as "IN LINE", or for side air
blowing, known as "REAR". It is also possible to modify the air-blowing configuration on site. To achieve this:
1 - Remove the top panel 1.
2 - Remove the fan motor access panel 2and
release a small length of motor cable.
3 - Remove the fan blower panel 3.
4- Fit the fan blower panel 3in the same location
as the access panel 2.
4 - Refit the fan access panel 2.
5 - Refit the top panel 1.
FILTER ACCESS
1
23
1
2
WITHOUT PLENUM
WITH PLENUM
The filter can be removed ONLY from the top without
having to dismantle the connection duct
The filter can be removed either from the side 1or from
the top 2without having to dismantle the connection
duct.

11
VENTILATION
An outdoor air intake (new air) may be required for ventilation. The blown air temperature must be controlled in
order to avoid the temperature of the mixture of outdoor air and return air at the heat pump inlet exceeding the
appliance’s operating limits. It is also common practice to shut down ventilation during periods of inoccupation
(night time setting of the set temperature).
Each appliance’s ventilation system is generally a sub-system within the building, with its own distribution duct
network. The simple introduction of outdoor air into each return air plenum, quite close to the unit’s return air
intake is sufficient and recommended. New air should not be introduced directly into the appliance. Provide for a
sufficient distance to ensure effective mixing of the outdoor air with the return air. (Refer to "Operating limits").
AERAULIC ADJUSTMENT
MODELS SPEEDS
TERMINALS
AUTOMATIC
TRANSFORMER
07
HS 5
MS 4
LS 3
09
HS 6
MS 5
LS 4
12
HS 7
MS 6
LS 5
MODEL 09
MODEL 07
0
10
20
30
40
50
60
70
80
90
100
Air flow (m3/h)
Available pressure (Pa)
220 240 260 280 300 320 340 360 380 400 420 440 460 480 500 520 540
System characteristics
LS MS HS
0
10
20
30
40
50
60
70
80
90
100
Air flow (m3/h)
Available pressure (Pa)
260 280 300 320 340 360 380 400 420 440 460 480 500 520 540 560 580 600
System characteristics
LS MS HS

12
Before starting the compressor for the first time, take off the panel (1) and then, whilst holding the
compressor, cut and remove the black plastic collar to unclamp the compressor.
UNCLAMPING THE COMPRESSOR
The retention collar must be cut before starting the compressor for the first time; otherwise,
it will vibrate, create considerable noise and result in refrigeration pipe breakages.
BLACK PLASTIC
COLLAR
MODEL 12
0
10
20
30
40
50
60
70
80
90
100
Air flow (m3/h)
Available pressure (Pa)
320 340 360 380 420 440 480 500 540 560 580 600 640 660 680 700 720 740400 460 520 620
System characteristics
LS MS HS

13
RECOMMENDATIONS FOR HYDRAULIC CONNECTIONS
1. It is recommended that all units are connected to a water supply and return pipe system of the Tickelman
Loop type. The Tickelman Loop system is self-balancing and thus only requires manual balancing if
a large number of units with different flow and pressure loss characteristics are connected to a single
hydraulic loop. A very simple way of checking the hydraulic balance is to measure the temperature
difference between the water connections. To ensure a correct water flow, the difference must be in
the region of 3 to 7 °C in Cooling mode and 2 to 5°C in Heating mode.
A system with two parallel pipes can also operate in a perfectly adequate manner, but it is more
difficult to achieve, and to maintain, balance.
2. Steel, copper or P.V.C. pressure pipes may be used.
3. It is advisable to make the unit’s water supply and return conveyance lines with short lengths of high-
pressure hose, as they form excellent shock absorbers for unit operating noise and hydraulic pressure
surges.
One of the hose ends must be fitted with a rotating connector to facilitate removal for maintenance.
Rigid pipes can be connected directly to the unit, but this is not recommended due to their inability
to absorb vibrations and noise.
Rigid pipes must be equipped with removable connectors to facilitate future removal of the unit from
its location.
4. Certain flexible hose threaded connectors are supplied with sealing paste. If this is not the case, use
Teflon tape to create a tight seal.
5. Each unit must be equipped with isolation valves on the water inlet and outlet pipes. The return
isolation valve is used for both cutting off the water supply and balancing the installation’s water flow.
As it is used to establish the balance of the flows, it must be equipped with a lockable position
end stop. This end stop ensures that, after the valve is closed, it can only be re-opened as far as
the position required to maintain a balanced water flow.
HYDRAULIC CONNECTIONS
Main return pipe work
Siphon
Hoses
Spherical dome
valve
Main water supply
pipe work
Main condensate drainage
pipe work
1
0
0

14
6. Never connect a unit to the water supply and return lines without completely
cleaning and flushing out the hydraulic loop beforehand. After performing these
operations, the units must be connected, with all valves completely open, ready for the system
to be filled with water.
COMMENT: In order to limit clogging the plate heat exchanger and to optimise unit operation,
it is advisable to equip the system with a sieve filter (Ø 0.8 mm) on the unit water inlet pipe work.
This filter should be installed between two isolation valves and should remain accessible to the user
for periodic checks.
7. Use steel, copper or P.V.C. pipes for the condensates drainage pipe. Each unit is supplied with a
connector for condensates drainage.
8. The condensates drainage line must comprise a siphon and run from the unit on a downward slope
of at least 2%. Generally, the siphon is connected directly to the unit’s condensates drainage outlet.
A length of plastic pipe can be used between the siphon and the condensates drainage line.
A complete condensates drainage system with copper or P.V.C. pipe can also be used.
Screw-on connectors shall be fitted to facilitate drainage pipe removal if copper pipe is used for the
drainage pipe work.
9. No point of the condensates drainage pipe work should be located above the level of one of the
units’ condensate drainage outlet connection.
10. The circuits’ high points must be bled of air.
11. Comply with current regulations in terms of dielectric isolation of the connectors and the pipe
work.
40mm
2%mini
40mm
Ø 16mm

15
RECOMMENDATIONS FOR CLEANING AND FLUSHING OUT THE SYSTEM
1. Before commissioning an appliance for the first time, the water loop must be cleaned and rinsed out
to remove any dirt and manufacturing debris.
If the appliances are equipped with isolation valves
(either electric or pressostatic), the water supply and
return conveyance circuits to and from each machine
must be connected to each other. This will avoid any
dirt being introduced into the units.
Flushing water through the units is acceptable if they
are not equipped with water flow control devices.
2. The system must be filled from the mains water
supply. All air bleeds must be open during filling.
Close the air bleeds once the system is filled.
The installer must start the main circulation pump
with the water top-up tap on the pressure reduction
valve in the open position. Check the air bleeds by
increasing order of height to ensure water flows freely
throughout the entire system.
Power supply to the cooling tower must be shut
down, and the water loop temperature regulation
thermostat must be set at 27 °C.
As the water circulates through the system, the installer must seek out and repair any possible pipe
work leaks. The drain cocks, on the lowest points on the circuit, must be open for flushing out and
chasing out any impurities. Ensure that the mains water valves are adjusted to allow water to enter at
the same speed as it exits. Check the pump inlet pressure gauge and manually adjust the compensating
valve to maintain the same pressure before and after the opening of the drain taps. Flushing must
be performed for at least two hours, or longer if necessary, until clear and clean water is obtained at
the drain taps.
3. Stop the additional heating and the water circulation pump. Open all the bleed points and the drain
taps to empty the system completely. The short-circuited water supplies and returns must now be
connected to the units’ inlet and outlet connections. It is recommended to use Teflon tape on the
pipe connector threads. Do not use sealing paste on the hoses’ rotating connecters.
4. Formerly, sodium tri-phosphate used to be recommended as a cleaning agent for flushing.
However, nowadays numerous countries forbid the introduction of phosphates into their wastewater
networks. Therefore, it is now recommended that the system is flushed out with hot water
(30 °C).
5. Fill the system again with clean water. Test the water acidity level (litmus paper), and treat as required
to obtain a slightly alkaline water quality (pH 7.5 to 8.5).
At this stage, the recommended percentage of anti-freeze can be added. Use commercial quality
anti-freeze specifically intended for air conditioning systems. Do not use automobile radiator anti-
freeze.
6. On the main electrical cabinet, adjust the heater set temperature point at 20 °C and the cooling tower
set temperature at 30 °C. Connect the power supply to all motors and start the circulation pumps.
When the normal flow level has been reached through all components, including the cooler (irrespective
of the season) and when the air is bled form the system and the loop temperature has stabilised, each
appliance is ready to be checked, tested and started for balancing the air and water flows.
Rubber
hose
Return conveyance
Supply conveyance
Main circuits
INTERCONNECTED
CONVEYANCES

16
LEGEND
N 752
POWER SUPPLY
The power supply must be protected by an FFG mains circuit breaker.
All the electrical installations and wiring associated with this equipment must comply with local installations
regulations.
CHART 1:
SE 4248 models 07/09/012 cooling only or heatpump 230V +/-10% 50Hz
230 Single phase models:
Connection to the terminals N, L and of the regulation board.
²- L : phase
²- N : neutral
²- : P-E ground
WIRING DIAGRAM AND LEGEND
WIRING DIAGRAM
SEE APPENDIX
MODELS Fuse aM
(without heating) Full load cur-
rent (max)
(without heating)
Fuse aM
(with heating) Full load cur-
rent (max)
(with heating)
Starting
amperage
230V
07 6A aM 4.7A 8A aM 7A 16A
09 6A aM 5A 10A aM 9.5A 16A
12 8A aM 6.3A 12A aM 12A 18.9A
DESCRIPTION OF WIRING DIAGRAM REFERENCES
FFG : Fuses according to chart 1 (not supplied)
COOLING
M1 : Refrigeration compressor.
F1 : External safety compressor
LP : Automatic reset Low Pressure pressostat.
HP : Automatic reset High Pressure pressostat.
C1 : M1 compressor condenser.
RV1 : 4 way valve for cycle inversion.
SW : Detector of condensed water level
VENTILATION
MV : Treated air fan motor.
TV : Auto-transformer
FV : MV motor internal safety device.
C : MV motor condenser.
WATER CIRCUIT
Y1 : Water circuit by-pass valve (not supplied).
FS : Flow switch

17
ELECTRICAL CONNECTIONS
GENERALITIES
Ensure that the available electrical power supply and the network frequency are matched to the required operating
current, taking account of the appliance’s specific location and the current required to supply any other appliances
connected to the same circuit.
1. Ensure that the unit is supplied with the specified voltage. Two stuffing boxes and one grommet hole
are provided on the side of the appliance. They are used respectively for the power and the control
wiring. The power supply line must be properly dimensioned with a motor supply type fuse or a mains
circuit breaker to protect the circuit against voltage surges. (Refer to the Maker’s Plate for the voltages
to be taken into consideration).
2. Always shut down the power supply to the unit before connecting the thermostat wiring.
PRESSOSTATS SETTINGS
LP : Low Pressure fixed setting: 1.5 bar (20 PSI) reset at 2.4bar (35 PSI)
HP : High Pressure fixed setting: 29 bar (420 PSI) reset at 21 bar (305 PSI).
COLOUR CODE
BK : Black OG : Orange GNYE : Green/Yellow
BN : Brown WH : White RD : Red
BU : Blue GY : Grey VT : Violet
YE : Yellow GN : Green
CONTROL AND REGULATION
RCL : Local control module.
ICT : Anti-freezing protection sensors.
RT : Intake air temperature sensor.
LWT : Outlet water temperature sensor.
SM : Remote ON/OFF switch, 100 m maximum (Not supplied -Please consult us for longer distances).
CLK : CLOCK input remote ON/OFF
KA3 : Flow switch relay
REMOTE MANAGEMENT AND PROGRAMMING MODULE KIT (<100M)
µBMS : Supervision module
FAULT REPORTING OPTION
KA2 : Remote fault reporting relay (3 A max / 230 V)
FAST CONNECTION OPTION AND SEEING "UNDER TENSION"
H1 : Seeing "under tension"
ELECTRIC HEATING BATTERY OPTION
EC1 : Stage 1 heating elements
EC2 : Stage 2 heating elements.
FA : Automatic reset safety thermostats.
FM : Manual reset safety thermostats.

18
RCL AND µBMS CONTROL MODULES WIRING
RCL
Unscrew the lower screw on the RCL control.
Separate the RCL control from its support bracket with the help
of a flat bladed screwdriver
Checking the support bracket :
Ensure that the wall surface is completely flat at the point where you wish to install the RCL control, as it is important
that the support bracket is not twisted on installation, because any bending could lead to the control not clipping
together properly and result in operating difficulties.
Fitting the support bracket :
²Present the support bracket to the desired location and align it with a spirit level.
²Mark the screw locations.
²Make a hole or install appropriate plugs according to the material (wood, concrete, plasterboard etc.).
²Screw the support bracket to the wall, preferably with round head screws matching the following
characteristics :
- Minimum length : 15 mm,
- Maximum head diameter : 7 mm,
- Maximum thread diameter : 3.5 mm,
- Head protrusion : 3.5 mm.
Lower screw
LED
The RCL control module must be connected in accordance with the diagram
below.
Use twisted pair telephone wire with a section of between 0.12 and 0.5 mm²
for wiring the control modules.
Take care to comply with the terminal connection reference numbers.
Support
bracket
RCL
1 2 3 4