Panasonic PAW-FC Manual

INSTALLATION AND
MAINTENANCE MANUAL
“Original Language”
PAW-FC Fan Coils
Cassette
Read through the Installation Instructions before you proceed with the installation. In particular, you will need to read
under the “ IMPORTANT ! ” section at the top of the page.
File name. IMM_PAW-FC_CAS_EN_06.21
June 2021

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−−−−− Contents −−−−−
Page
1. General recommendations..............................................................................5
1.1 Safety directions ............................................................................................ 5
1.2 Warning......................................................................................................... 5
2. Inspection and storage ...................................................................................6
2.1 Disposal information ...................................................................................... 6
3. Warranty..........................................................................................................6
4. Presentation....................................................................................................7
4.1 Operating limits.............................................................................................. 7
4.2 Nomenclature ................................................................................................ 9
4.3 Unit nominal performance .............................................................................. 9
5. Installation.....................................................................................................10
5.1 Unit location – Recommendations ................................................................ 10
5.2 Clearance.................................................................................................... 11
5.3 Mounting the unit ......................................................................................... 11
6. Hydraulic connections ..................................................................................13
6.1 2-way regulating valve - accessory ............................................................... 13
6.2 Installing the 3-way regulating valve - accessory........................................... 14
6.3 Operation of the thermo-electric valve .......................................................... 15
6.4 Connecting the condensate evacuation pipe to the drain tray ........................ 15
7. Installation of the plastic diffuser ................................................................. 16
8. Electrical connections ..................................................................................17
8.1 Fuse protection............................................................................................ 17
8.2 Connecting the power supply cable .............................................................. 17
8.3 Terminal block ............................................................................................. 18
8.4 Connecting a field-supplied controller ........................................................... 19
Wiring diagram - Models PAW- FC*A-U*** ................................................................ 20
Wire colouring code.................................................................................................. 20
Electrical data - Models PAW- FC*A-U***.................................................................. 20
Wiring diagram - Models PAW- FC*E-U*** ................................................................ 21
Wire colouring code.................................................................................................. 21
Electrical data - Models PAW- FC*E-U***.................................................................. 21
8.5 Safety requirements for electric appliances................................................... 22
8.6 Ground requirements ................................................................................... 22
9. Accessories: 2 way or 3 way ON/OFF valves ............................................... 22
10. Optional Wired remote controller: PAW-FC-903TC ...................................... 23
10.1 Specifications .............................................................................................. 24
10.2 Dimensions ................................................................................................. 24
10.3 Functions .................................................................................................... 24
10.4 Installation ................................................................................................... 25
10.5 Mounting ..................................................................................................... 25
10.6 Wiring.......................................................................................................... 25
10.7 Operation instructions .................................................................................. 26
11. Optional Advanced wired remote controller: PAW-FC-RC1 ......................... 27

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11.1 Specifications .............................................................................................. 27
11.2 Dimensions ................................................................................................. 28
11.3 Functions .................................................................................................... 28
11.4 Installation ................................................................................................... 28
11.5 Operation instructions .................................................................................. 28
11.6 Settings ....................................................................................................... 29
11.7 Error messages ........................................................................................... 30
12. Modbus communication protocol PAW-FC-RC1 ..........................................30
12.1 Modbus register types.................................................................................. 30
12.2 Discrete Input Register................................................................................. 30
12.3 Coils Register .............................................................................................. 31
12.4 Input Register .............................................................................................. 31
12.5 Holding Register .......................................................................................... 31
13. Optional Wired remote controller for EC fan: PAW-FC-907TC..................... 33
13.1 Specifications .............................................................................................. 34
13.2 Dimensions ................................................................................................. 34
13.3 Functions .................................................................................................... 34
13.4 Installation ................................................................................................... 35
13.5 Mounting ..................................................................................................... 35
13.6 Wiring.......................................................................................................... 35
13.7 Operation instructions .................................................................................. 36
14. Modbus communication protocol PAW-FC-907TC.......................................36
15. Commissioning.............................................................................................39
15.1 Performing pre-start checks ......................................................................... 39
15.2 Performing a test run ................................................................................... 39
15.3 Performing the final tasks............................................................................. 39
16. Maintenance.................................................................................................. 39
16.1 Regular servicing tasks ................................................................................ 39
Dimensions and weights......................................................................................................................................................... 43
Information requirements for fan coil units ............................................................................................................................ 44

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IMPORTANT!
Please Read Before Starting
This equipment must be installed by the sales dealer or
installer. This information is provided for use only by
authorized persons.
For safe installation and trouble-free
operation, you must:
•Carefully read this instruction booklet before
beginning.
•Follow each installation or repair step exactly as
shown.
•This unit shall be installed in accordance with
National Wiring Regulations.
•This unit complies with the requirements of the
following EU legislation: 2014/30/EU (EMC),
2006/42/EC (Machinery), 2011/65/EU (RoHS),
2014/35/UE (Low Voltage Directive) and all
applicable Standards (see EC Declaration for
details).
•Pay close attention to all warning and caution
notices given in this manual.
WARNING
This symbol refers to a hazard
or unsafe practice which can
result in severe personal
injury or death.
CAUTION
This symbol refers to a hazard
or unsafe practice which can
result in personal injury or
product or property damage.
If Necessary, Get Help
These instructions are all you need for most installation sites
and maintenance conditions. If you require help for a special
problem, contact our sales/service outlet or your certified
dealer for additional instructions.
In Case of Improper Installation
The manufacturer shall in no way be responsible for improper
installation or maintenance service, including failure to follow
the instructions in this document.
Notice
The English text is the ‘Original language’.
The content of this document is intended for use by the
manufacturer professional personnel only.
SPECIAL PRECAUTIONS
WARNING When Wiring
ELECTRICAL SHOCK CAN
CAUSE SEVERE PERSONAL
INJURY OR DEATH. ONLY A
QUALIFIED, EXPERIENCED
ELECTRICIAN SHOULD
ATTEMPT TO WIRE THIS
SYSTEM.
•Do not supply power to the unit until all wiring and
tubing are completed or reconnected and checked.
•Highly dangerous electrical voltages are used in this
system. Carefully see the wiring diagram provided with
the IMM Manual when wiring. Improper connections
and inadequate grounding can cause accidental injury
or death.
•Connect all wiring tightly. Loose wiring may cause
overheating at connection points and a possible fire
hazard.
•ELCB must be incorporated in the fixed wiring.
•Circuit breaker must be incorporated in the fixed wiring
in accordance with the wiring regulations.
When Transporting
•It may need two or more people to carry out the
installation work.
•Care should be taken when lifting or moving the unit to
reduce the chance of serious injury. Do not attempt to
move the equipment without the correct means of
lifting.
When Installing…
Select an installation location which is rigid and strong enough
to support or hold the unit, and select a location for
easy maintenance.
When Servicing
•Turn the power OFF at the main power box (mains), wait
at least 10 minutes until it is discharged, then open the unit
to check or repair electrical parts and wiring.
•Keep your fingers and clothing away from any moving
parts.
•Clean up the site after you finish, remembering to check
that no metal scraps or bits of wiring have been left inside
the unit.
WARNING
•This product must not be modified or disassembled under
any circumstances. Modified or disassembled unit may
cause fire, electric shock or injury.
•Users must not clean inside the unit. Engage authorized
dealer or specialist for cleaning.
•In case of malfunction of this unit, please contact to the
sales dealer or service dealer for a repair and disposal.
•Any operation carried out by unauthorized personnel is
prohibited and can cause serious damage to people and
things.
Others
When disposing of the product, comply with national
Regulations.

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CAUTION
•Do not touch the air inlet or the sharp aluminium fins of
the coil of the unit. You may get injured.
•Do not sit or step on the unit, you may fall down
accidentally.
•Do not stick any object into the FAN CASE.
You may be injured and the unit may be damaged.
POWER SUPPLY MUST BE
SWITCHED OFF BEFORE
STARTING WORK INTHE
ELECTRIC BOX
1. General recommendations
The purpose of this Manual is to provide users with
instructions for installing, commissioning, using the units. It
contains the description of all the maintenance operations
guaranteeing the unit’s long life and reliability. Only the
services of a qualified technician can guarantee the unit’s
safe operation over a long service life. Please read the
following safety precautions very carefully before working on
the unit.
1.1 Safety directions
Follow the safety rules in force when you are working on your
fan coil. This appliance has not been designed for use by
persons (including children) with reduced physical, sensorial
or mental faculties or by persons without any experience or
knowledge of cooling and heating systems, unless they act
under the safety and supervision of a responsible person or
have received prior training concerning the use of the
appliance.
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 to 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.
1.2 Warning
Cut-off power supply before starting to work on the unit.
When making the hydraulic connections, ensure that no
impurities are introduced into the pipe work.
The fan-coil units may contain a small amount of oil
incompatible with plastic polyethylene piping
(PER/HTA/PVC). The coil should be rinsed out before use
to avoid any problem.
It is the installer’s responsibility to contact their pipe
supplier and take into account the general instructions
for the use of plastic pipes.
The manufacturer declines any responsibility and the
warranty becomes void if these instructions are not
respected.
If you meet a problem, please call the Technical Department
for your area. If possible, assemble the compulsory 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 Data Manual (TDM). The
information contained in this manual are subject to
modification without prior notice.

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2. 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 his 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.
Environmental conditions must be within the following limits:
- Minimum ambient temperature : -20°C
- Maximum ambient temperature : +55°C
- Maximum R.H. : 95% not condensing
The equipment must be stored in environments with a
temperature within the limits indicated above. High humidity
atmosphere may damage electrical components.
2.1 Disposal information
Units must be disposed of in accordance with local regulations.
Information for Users on Collection and Disposal of Old Equipment and Used Batteries
These symbols on the products, packaging, and/or accompanying documents mean that used electrical and electronic products and
batteries should not be mixed with general household waste. For proper treatment, recovery and recycling of old products and used
batteries, please take them to applicable collection points, in accordance with your national legislation and the Directives 2012/19/EU of 4
July 2012 on waste electrical and electronic equipment (WEEE).
By disposing of these products and batteries correctly, you will help to save valuable resources and prevent any potential negative effects
on human health and the environment which could otherwise arise from inappropriate waste handling. For more information about
collection and recycling of old products and batteries, please contact your local municipality, your waste disposal service or the point of
sale where you purchased the items. Penalties may be applicable for incorrect disposal of this waste, in accordance with national
legislation.
For business users in the European Union
If you wish to discard electrical and electronic equipment, please contact your dealer or supplier for further information.
[Information on Disposal in other Countries outside the European Union]
These symbols are only valid in the European Union. If you wish to discard these items, please contact your local authorities or dealer and
ask for the correct method of disposal.
Note for the battery symbol (bottom two symbol examples):
This symbol might be used in combination with a chemical symbol. In this case it complies with the requirement set by the Directive for
the chemical involved.
3. Warranty
The appliances are delivered fully assembled, factory tested and ready to operate.
Any modification to the units without the manufacturer’s prior approval, shall automatically render the warranty null and void.
The following conditions must be respected in order to maintain the validity of the warranty:
•Commissioning shall be performed by specialised technicians from technical services approved by the manufacturer.
•Maintenance shall be performed by technicians trained for this purpose.
•Only Original Equipment spare parts shall be used.
•All the operations listed in the present manual shall be performed within the required time limits.
THE WARRANTY SHALL BE NULL AND VOID IN THE EVENT OF NON-COMPLIANCE
WITH ANY OF THE ABOVE CONDITIONS.

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4. Presentation
The range of PAW-FC Fan Coil includes the Cassette (AC / EC) configuration which is available in different sizes.
The cooling capacity is from 1,4 to 9,4 kW and the heating capacity is from 1,1 to 14,0 kW.
The version available is reversible 2-pipes, 4-pipes, with AC fan or EC fan.
Main features and accessories:
−2 and 4-pipe configurations
−Very low acoustic levels
−Quick access, by simply removing the front grille
−All connections: located at the same side
−Galvanized steel sheet with thermal and acoustical insulation, avoiding condensation on the casing and providing good
sound attenuation
−Cleanable synthetic-type air filter
Optional controller for AC fan
Optional controller for EC fan
Optional controller.
Wired remote controller.
PAW-FC-903TC
Optional controller.
Advanced wired remote controller.
PAW-FC-RC1
Optional controller.
Wired remote controller for EC fans.
PAW-FC-907TC
Casing
Made of galvanized steel insulated with closed cell
polyethylene foam.
Access to internal components of the unit is facilitated by easy
dismounting of the plastic cover. All models are equipped with
a 3-top condensate drain pump to ensure optimal condensate
draining and to minimize water retention. Condensate drain
pan is made from galvanized sheet steel coated with closed
cell polyethylene foam on external face. The drain pan is
painted to ensure anticorrosion protection.
Coil
The coil is made of staggered copper tubes, mechanically
expanded into aluminium fins, assuring maximum heat
transfer efficiency.
Each coil is supplied with headers having an air vent at the
highest point and a drain plug at the lowest point.
Filter
Units are equipped with filters consisting of cleanable
synthetic media (sewn on wire frame), which are easily
removable for cleaning or replacement.
Ventilation
The units are fitted with a fan-motor assembly of which the fan
is composed of impeller with aerodynamically profiled blades.
Optimized fan speed staging to reduce sound level.
The AC motor is an asynchrony direct drive type having 5
speeds, 3 of them are factory prewired.
The motor is suitable for nominal voltage of 230 V / 1 Ph / 50-
60 Hz and is equipped with a built-in thermal overload
protection of automatic reset type.
The EC motor is a high efficiency type with low electrical
consumption for significant energy savings. The motor is
suitable for 0 - 10 V input, ensuring variable speed capability.
Power supply
Units are supplied complete with internal electrical wiring
terminating in a junction block protected by a cap.
Cabinet internal space allows for installation of optional control
systems supplied by the distributor or others.
4.1 Operating limits
Power supply Nominal single phase voltage: 230 V – 50/60 Hz
Operating voltage limits: min. 207 V – max. 253 V
Ambient air conditions Minimum ambient temperature / relative humidity: +5 °C / 15% R.H.
Maximum ambient temperature / relative humidity: +32 °C / 70% R.H.
Water circuit conditions Maximum operating pressure 14 bar
Minimum inlet temperature (100 % water) +5 °C
Maximum inlet temperature +80 °C
Water quality
Risk of excessive clogging inside the coil tubes due to inadequate water quality.
Using untreated or unsuitable water can lead to excessive clogging inside the coil tubes (earth and mud deposits, corrosion, etc.)
with major consequences on the thermal efficiency of the unit and irreversible damage to the equipment.
−Contact a specialised water treatment company for advice on establishing a suitable water quality and on any required water
treatment.
−If treatment is required, make sure it works effectively.

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−Ensure that a suitable water quality is maintained at all times, because the manufacturer and its representative decline all
responsibility in the event of untreated or incorrectly treated water being used.
Guidelines for water quality
Substance Condition Effects Recommended content
NH4+No NH4+ammonium ions in the water, highly detrimental to copper. < 10 mg/l
Cl- Cl-chloride ions are detrimental to copper with a risk of puncture by picking corrosion. < 10 mg/l
SO42SO42- sulphate ions may cause perforating corrosion < 30 mg/l
Fluoride ions No fluoride ions < 0.1 mg/l
Fe2+ and Fe3+ No Fe2+ and Fe3+ ions, particularly in case of dissolved oxygen. The presence of these ions with dissolved
oxygen indicates corrosion of steel parts, likely to generate corrosion of copper parts under Fe deposits.
Fe < 5 mg/l;
with dissolved oxygen < 5 mg/l
Dissolved silica Silica is an acid element of water and may also cause corrosion. < 1 mg/l
Total water
hardness (TH)
Values between 10 and 25 may be recommended. This facilitates scaling deposits likely to limit copper
corrosion. Excess TH values may lead to clogging the pipes. 10 °F < TH < 25 °F
Total alkalinity
(TAC) TAC < 100 mg/l
Dissolved
oxygen
Prevent any sudden change in the water's oxygenation conditions. Also, avoid deoxygenating water by
sparging inert gas as well as over oxygenating it by pure oxygen sparging. Disturbing oxygenation
conditions destabilizes copper hydroxides and particle salting-out.
Electrical
Resistivity /
Conductivity
The higher the resistivity, the slower the corrosion. Values above 3000 ohm/cm are preferred. A neutral
environment favours maximum resistivity.
For electrical conductivity, values around 200 ... 600 S/cm can be recommended.
pH neutral pH at 20°C 7 < pH < 8

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4.2 Nomenclature
The nomenclature reflects each model’s type, coil configuration, external static pressure configuration, size and service side.
Example:
PAW-FC
2
A
-
U
040
Unit type PAW-FC = Fan Coil Unit
Number of pipes 2 = 2-pipe configuration
4 = 4-pipe configuration
Fan motor type A = AC fan motor1
E = EC fan motor2(electronically commutated)
Separator -
Model type U = cassette-type model
D = ducted model with low external static pressure (ESP)
F = ducted model with medium external static pressure (ESP)
E = ducted model with high external static pressure (ESP)
T = ceiling-mounted model
P = floor-standing model
U = cassette-type model
K = wall-mounted model
Size
Service side Blank = not applicable4
L = left-hand service side configuration3
R = right-hand service side configuration3
IR compatibility Blank = not applicable
IR = IR receiver integrated5 (supplied with compatible IR controller)
1) AC fan motor not available for F-type models
2) EC fan motor not available for K-type models
3) Service side as seen from the unit‘s air discharge side
4) For U-type models: all connections on one side. For K-type models: connections always on #?left/right-hand?# side
5) Applicable for K-type models only
4.3 Unit nominal performance
PAW-
AC fan 2-pipe
FC2A-U020 FC2A-U030 FC2A-U040 FC2A-U050 FC2A-U060 FC2A-U070
Total cooling capacity1) Lo/Med /Hi kW 1,5 / 1,8 / 2,4 1,9 / 2,7 / 4,0 2,8 / 3,5 / 4,7 3,4 / 4,4 / 6,1 3,7 / 5,4 / 7,2 4,0 / 6,5 / 8,6
Sensible cooling capacity1) Lo/Med/Hi kW 1,3 / 1,5 / 2,0 1,4/ 2,2 / 3,0 2,1 / 2,6 / 3,6 2,6 / 3,4 / 4,8 2,7 / 4,0 / 5,4 3,0 / 4,8 / 6,4
Water flow Lo/Med/Hi l/h 265 / 303 / 404 323 / 493 / 683 478 / 597 / 801 576 / 762 / 1042 636 / 937 / 1233 695 / 1111 / 1476
Water pressure drop Lo/Med/Hi kPa 4,3 / 6,8 / 10,9 3,6 / 8,5 / 14,4 6,9 / 11,2 / 18,3 8,4 / 13,0 / 21,9 3,4 / 7,5 / 11,5 5,6 / 13,0 / 20,5
Heating capacity2) Lo/Med /Hi kW 2,2 / 2,5 / 3,2 2,3 / 3,7 / 4,5 3,7 / 4,6 / 6,2 4,5 / 6,0 / 8,1 4,5 / 7,4 / 10,0 5,2 / 9,2 / 12,0
PAW-
AC fan 4-pipe
FC4A-U020 FC4A-U030 FC4A-U040 - FC4A-U060 FC4A-U070
Total cooling capacity1) Lo/Med /Hi kW 1,4 / 1,5 / 2,0 2,0 / 2,7 / 3,4 2,5 / 3,3 / 4,0 - 3,0 / 4,9 / 6,6 3,2 / 6,0 / 7,5
Sensible cooling capacity1) Lo/Med/Hi kW 1,2 / 1,4 / 1,8 1,5 / 2,1 / 2,6 2,0 / 2,6 / 3,2 - 2,3 / 3,8 / 5,1 2,5 / 4,6 / 5,9
Water flow Lo/Med/Hi l/h 232 / 258 / 359 342 / 465 / 576 437 / 563 / 683 - 511 / 851 / 1137 543 / 1030 / 1294
Water pressure drop Lo/Med/Hi kPa 6,6 / 8,9 / 13,6 4,4 / 8,3 / 11,6 6,7 / 11,2 / 15,3 - 6,0 / 13,9 / 22,2 7,1 / 18,9 / 27,5
Heating capacity2) Lo/Med /Hi kW 0,8 / 0,9 / 1,2 2,2 / 3,1 / 3,8 3,0 / 3,5 / 4,1 - 3,7 / 5,5 / 7,0 4,5 / 7,1 / 8,9
Water flow Lo/Med/Hi l/h 132 / 153 / 201 374 / 530 / 658 521 / 603 / 699 - 636 / 939 / 1210 776 / 1214 / 1540
Water pressure drop Lo/Med/Hi kPa 25,7 / 33,4 / 53,6 13,7 / 24,2 / 35,0 24,2 / 30,9 / 39,8 - 7,6 / 13,8 / 20,7 10,2 / 20,8 / 30,9
1) According to Eurovent standard. Air: 27°C DB / 19°C WB. Water in/out: 7°C / 12°C.
2) According to Eurovent standard. Air: 20°C. Water in/out: 45°C / 40°C.

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PAW-
EC fan 2-pipe
FC2E-U020 FC2E-U030 FC2E-U040 FC2E-U050 FC2E-U060 FC2E-U070
Total cooling capacity1) Lo/Med /Hi kW 1,6 / 1,8 / 2,4 1,9 / 2,9 / 4,0 2,8 / 3,5 / 4,7 3,4 / 4,4 / 6,1 3,7 / 5,5 / 7,2 4,1 / 6,5 / 9,6
Sensible cooling capacity1) Lo/Med/Hi kW 1,3 / 1,5 / 2,0 1,4 / 2,2 / 3,1 2,1 / 2,7 / 3,6 2,6 / 3,5 / 4,7 2,7 / 4,1 / 5,4 3,0 / 4,9 / 7,2
Water flow Lo/Med/Hi l/h 267 / 306 / 409 325 / 497 / 688 481 / 604 / 808 579 / 765 / 1050 640 / 944 / 1243 700 / 1119 / 1649
Water pressure drop Lo/Med/Hi kPa 4,2 / 6,9 / 11,2 3,5 / 8,6 / 14,6 6,8 / 11,4 / 18,6 8,4 / 13,1 / 22,2 3,4 / 7,6 / 11,7 5,8 / 13,1 / 24,6
Heating capacity2) Lo/Med /Hi kW 2,2 / 2,5 / 3,2 2,3 / 3,7 / 4,5 3,7 / 4,6 / 6,2 4,5 / 6,0 / 8,1 4,5 / 7,4 / 10,0 5,2 / 9,2 / 13,0
PAW-
EC fan 4-pipe
FC4E-U020 FC4E-U030 FC4E-U040 - FC4E-U060 FC4E-U070
Total cooling capacity1) Lo/Med /Hi kW 1,4 / 1,5 / 2,0 2,0 / 2,7 / 3,4 2,6 / 3,2 / 4,0 - 3,0 / 5,0 / 6,6 3,2 / 6,1 / 7,9
Sensible cooling capacity1) Lo/Med/Hi kW 1,2 / 1,4 / 1,9 1,5 / 2,1 / 2,6 2,1 / 2,6 / 3,3 - 2,3 / 3,8 / 5,1 2,6 / 4,7 / 6,3
Water flow Lo/Med/Hi l/h 234 / 262 / 344 344 / 464 / 581 442 / 556 / 690 - 516 / 858 / 1144 549 / 1041 / 1366
Water pressure drop Lo/Med/Hi kPa 6,6 / 9,1 / 14,0 4,4 / 8,2 / 11,7 6,7 / 10,9 / 15,5 - 6,0 / 14,1 / 22,4 7,2 / 19,2 / 30,1
Heating capacity2) Lo/Med /Hi kW 0,8 / 0,9 / 1,2 2,2 / 3,1 / 3,8 3,0 / 3,5 / 4,1 - 3,7 / 5,5 / 7,0 4,5 / 7,1 / 9,8
Water flow Lo/Med/Hi l/h 132 / 153 / 201 374 / 530 / 658 521 / 603 / 699 - 636 / 939 / 1210 776 / 1214 / 1686
Water pressure drop Lo/Med/Hi kPa 25,7 / 33,4 / 53,6 13,7 / 24,2 / 35,0 24,2 / 30,9 / 39,8 - 7,6 / 13,8 / 20,7 10,2 / 20,8 / 36
1) According to Eurovent standard. Air: 27°C DB / 19°C WB. Water in/out: 7°C / 12°C.
2) According to Eurovent standard. Air: 20°C. Water in/out: 45°C / 40°C.
5. Installation
CAUTION
- The unit installation work must be done by qualified personnel according to the local rules and this manual.
- The unit should not be installed in a bathroom, a laundry, a sauna or a swimming-pool.
During the installation:
•Take care to avoid any rough handling or impacts when
unloading and moving the appliance.
•Before hoisting into position, test lift to insure stability and
balance. Avoid twisting or uneven lifting of the units.
•The units shall be carefully inspected before unit
installation to make sure that no handling damage has
occurred.
•All these sections have been inspected before leaving the
factory. It is therefore important to insure that no bolts,
screws or other fixing system are loosened or missing
before the commissioning. During the handling of the
machine it is mandatory to provide all the devices
necessary to guarantee personal safety.
5.1 Unit location – Recommendations
Select the unit location with the following aspects in mind:
•Choose an area free from obstructions which may cause
uneven air distribution and/or return.
•Consider using an area where installation is easy.
•Choose a position that allows for the clearances required.
•Look for a position in the room which ensures the best
possible air distribution.
•Install unit in a position where condensate can easily be
piped to an appropriate drain.
Positions to avoid:
•Exposure to direct sunlight.
•Exposure to oil vapours.
•Areas close to heat sources.
•Installation in areas with high frequency waves.
•On damp walls or in positions that may be exposed to
water hazard.
•Where curtains or furniture may obstruct free air circulation.
•Positions too close to heating sources which may damage
the unit.

11
5.2 Clearance
To avoid any obstruction of the unit air intake or supply grilles.
Keep free space for inspection and maintenance.
- Such device is not accessible to the public. It must be installed at least 2.5 m above ground level, unless it is installed
inside engine rooms or in similar environments.
- Install the unit as centrally as possible in the room, the air flow direction can be controlled by manually regulating the
louvres position, according to the operating mode (cooling or heating): this will ensure optimum distribution of the air in the
room.
- During cooling mode operation the best position for the deflecting louvres is one which allows air diffusion close to the
ceiling. In heating mode, the louvres should be positioned so that the air is directed towards the floor, in order to prevent
layers of hot air forming in the upper part of the room.
- In order to allow easy and rapid installation and maintenance, make sure that in the selected position it is possible to
remove the ceiling panels or, if the ceiling is constructed of masonry, that access to the unit is guaranteed.
Max. 2 louvres
closed
5.3 Mounting the unit
All installation equipment and mounting material must be provided by the installer.
Prior to installation
It is advisable to place the unit as close as possible to the installation site before removing it from the packaging. The grille panel and
the control are separately packed for maximum protection.
IMPORTANT:
- Do not lift the unit by the condensate drain discharge
pipe; hold it by its four corners only.
- Unit installation will be facilitated using a stacker.
- Plastic diffuser only: If plaster board ceiling panels
are installed the maximum dimensions of the unit
housing must not exceed:
o660 x 660 mm (mod. PAW-FC**-U020 to
PAW-FC**-U040) and;
o900 x 900 mm (mod. PAW-FC**-U050 to
PAW-FC**-U070).
- In rooms with high humidity, brackets should be
insulated by self-adhesive insulation supplied.

12
Installation
Mark the position of the hangers, connection lines and condensate drain pipe, power supply cables and remote control cable (see
dimensions); the cardboard template (supplied with the kit) may be of assistance for this operation.
1 Depending on the type of ceiling the hangers can be fixed
as shown in the drawing.
2 Once the threaded hangers have been positioned, do not
tighten the nuts, and insert the washers as shown in the
drawing.
3 Once the hydraulic connections are in place, remove the
"T" bar in order to facilitate installation operations – see
figure -.
4
Carefully lift the unit (without the frame) using the four
suspension brackets (or the four corners), inserting it into
the false ceiling.
If the "T" bar cannot be removed the unit may need to be
tilted (this operation may only be carried out with false
ceilings with a minimum height of 300 mm).
5
Align and level the unit by adjusting the nuts and locknuts
on the threaded hangers, maintaining a distance of 25 -30
mm between the sheet metal body and the underside of
the false ceiling.
Reposition the "T" bar and align the unit in relation to the
bar by tightening the nuts and lo
cknuts. After the
condensate drain pipe and the water ducts have been
connected, check to make sure that the unit is level.

13
6. Hydraulic connections
CAUTION:
All installation equipment and mounting material must be provided by the installer.
Flexible pipes are recommended for connecting the coils to prevent transmission of vibration
.
The unit is provided with inlet and outlet female connections for both 2 and 4 pipe models.
An air bleed valve is also provided (See figure), which can be adjusted using an 8 mm wrench.
IMPORTANT
To make water connections to the heat exchanger or the valves use threaded joints and suitable materials that can ensure perfect
tightness.
Models PAW-FC**-U020 to PAW-FC**-U040 Models PAW-FC**-U050 to PAW-FC**-U070
2-pipe
4-pipe
Ref. Description PAW-FC2*-U020 to
PAW-FC2*-U040
PAW-FC2*-U050 to
PAW-FC2*-U070
PAW-FC4*-U020 to
PAW-FC4*-U040
PAW-FC4*-U050 to
PAW-FC4*-U070
1
Water inlet C (C/H)
¾”
¾”
¾”
¾”
2
Water outlet C (C/H)
¾”
¾”
¾”
¾”
3
Air bleeding valves
-
-
-
-
4
Water inlet H
-
-
½”
¾”
5
Water outlet H
-
-
½”
¾”
IMPORTANT
- When making the hydraulic connections, ensure that no impurities are introduced into the pipework.
6.1 2-way regulating valve - accessory
The water flow has to be controlled by installing the motorized thermo-electric valves supplied an accessory or by installing motorized
field supplied valves.
IMPORTANT
Using a 2-way regulating valve MANDATORILY requires the fitting of additional balancing valves in the water circuit, to prevent water
from circulating in the unit when the fan is not operating and to maintain a steady water flow in the rest of the water circuit.
2-pipe
4-pipe
Ref. Description PAW-FC2*-U020 to
PAW-FC2*-U040
PAW-FC2*-U050 to
PAW-FC2*-U070
PAW-FC4*-U020 to
PAW-FC4*-U040
PAW-FC4*-U050 to
PAW-FC4*-U070
1
Actuator
1
1
2
2
2
Valve ½”
-
-
1
-
Valve ¾”
1
-
1
1
Valve 1”
-
1
-
1
3
Shell
1
1
1
1
4
Clips
3
3
3
3
5
Gasket
2
2
4
4

14
6.2 Installing the 3-way regulating valve - accessory
The water flow has to be controlled by installing the motorized thermo-electric valves supplied an accessory or by installing motorized
field supplied valves.
2-pipe
4-pipe
Ref. Description PAW-FC2*-U020 to
PAW-FC2*-U040
PAW-FC2*-U050 to
PAW-FC2*-U070
PAW-FC4*-U020 to
PAW-FC4*-U040
PAW-FC4*-U050 to
PAW-FC4*-U070
1
Actuator
1
1
2
2
2
Valve ½”
-
-
1
-
Valve ¾”
1
-
1
1
Valve 1”
-
1
-
1
3
Shell
1
1
1
1
4
Clips
3
3
3
3
5
Gasket
2
2
4
4
- With 4–pipes models, first install the valve assembly
for the cold circuit followed by the valve assembly for
the hot circuit.
- Connect the valve assemble to the coil and fasten it
by a 30Nm torque.
- Insulate the valve assembly.
Gasket type Torque [Nm]
Rubber 10 / 12
Fibre 25 / 30
- Fit the actuator on the valve body, route the valve
cable through the box and connect it to the terminal
block as shown in the figure below.
N Neutral
Cables routing
L Phase
Lc Condensate Pump phase
H Heating
C Default contact condensate pump
V Cooling valve
V1, V2, V3 Motor speed

15
- To connect the steel pipes to the system, ensure they
are aligned and supported to avoid excess strain on
the unit. If the system is filled with water, check all
fitting seals.
- After ending the hydraulic connections, make sure
there are no leaks Insulate the valve using the shell,
fix it by means of the clips and make sure that all cold
parts are insulated (see figure).
- For 4-pipe hot water, repeat all the operations with
gas adaptors, as per the table on the previous page.
CAUTION:
- When the system is filled with water, verify all couplings for tightness.
- The manufacturer does not accept responsibility for the tightness of the field - installed valve
assembly and this is not tested in the factory. He declines any responsibility for non-functioning of
these assemblies and for damage due to dripping.
6.3 Operation of the thermo-electric valve
- This 2 or 3-way valve is of the OPEN/CLOSE type
with very slow stroke. It is not a modulating valve so
it has no PTC. This valve is driven, as a sensible
element, by the ambient thermostat of the “cassette”
unit.
- The 2-way valve is normally closed to the coil with no
powered actuator side.
The 3-way valve is normally closed to the coil with no
powered actuator side while is open to the bypass
way side.
When the room temperature does not satisfy the
thermostat, the valve opens after about 3 minutes
about to allow water to circulate in the coil.
- If the room temperature satisfies the thermostat or if
the electric power has been switched off, the valve is
closed after about 3 minutes towards the coil and is
opened towards the bypass.
- If an emergency occurs, the valve may be manually
opened, removing the electric head, unscrewing the
ring nut. When the emergency ends, remember to
reset the valve to automatic operation, repositioning
the electric head; failure to do this can result in
condensate formation due the water pipes, even if
the unit is switched off.
6.4 Connecting the condensate evacuation pipe to the drain tray
A condensate tray is supplied with a 5/8" exterior diameter copper drain hole, which must be connected to the main evacuation
pipe, to ensure that the condensed water will drain properly from the tray.
- Connecting condensate piping to sewage system
drain with appropriate trap.
Trap height must be calculated according to the unit
discharge head in order to allow sufficient and
continuous water evacuation (See figure).
- To avoid horizontal sections or curves of condensate
drain piping. The slope must be greater than 2% .
- To avoid ascending sections of condensate drain piping. These may only be used near the unit with a

16
maximum height difference of 200 mm from the
top of the unit (See figure).
IMPORTANT
Non-level installation will cause condensate dripping Do not flatten or crush the condensate drain pipe
7. Installation of the plastic diffuser
Carefully unpack the assembly and check for damage sustained in transit.
Attach the assembly to the unit, fastening it onto its two fixing supports (ref. 1), then locking the four fixing nuts with their spacers
(ref. 3).
CAUTION:
To fasten the frame use only the screws supplied with it.
Ensure that the frame is not distorted by excessive tightening, that it is aligned with the false ceiling and above all that there is a
seal between the air inlet and outlet.
In the drawing gasket "4" prevents return air from mixing with the supply air and gasket "5" prevents the supply air from leaking into
the ceiling void. On completion, the gap between the unit frame and the false ceiling must not be more than 5 mm.

17
8. Electrical connections
WARNING
Danger to life from electric shock.
Before carrying out any work on the equipment, make sure that the electrical power supply is disconnected
and that there is no possibility of the unit being started inadvertently.
Non-compliance with the above instructions can lead to injury or death by electrocution.
The devices are operated with 230-V alternating voltage. Any contact with live conductors can present a danger to life from electric
shock.
- Electrical installation work must be undertaken by a trained electrician.
- Ensure that you have disconnected the electricity supply before you carry out installation work. Secure the electricity
supply against being switched on again unintentionally.
8.1 Fuse protection
All unit must be installed with a fuse for machine protection. Refer to the following table for fuse installation and replacement:
PAW-
AC / EC fan 2-pipe / 4-pipe
FC**-U020 FC**-U030 FC**-U040 FC**-U050 FC**-U060 FC**-U070
Fuse type AC FAN - gF gF gF gF gF gF
Fuse type EC FAN - gG gG gG gG gG gG
Fuse rating Amps
1,0 1,0 1,0 1,0 1,0 1,0
8.2 Connecting the power supply cable
All Cassette units are designed for operation with 230 volts, single phase, 50 or 60 cycles.
Each Cassette unit is supplied with a terminal board.
Mains voltage and extra-low voltage wiring must each be done
in accordance with the applicable local electrical code and the
wiring diagram corresponding to the unit model.
The control box panel is positioned on the external side of
the unit (see figure). Remove the fixing screws and the cover
of the control box panel. The control box panels contain the
terminal blocks for connections as shown in the wiring
diagrams.
1 Electrical box
Control box – internal view
2 Cable holder
3 Terminal block
4 Capacitor
5 Valve cable inlet
The power supply cable shall be selected in accordance with the following criteria:
−Power supply cable length and installation mode.
−Maximum unit starting current draw – the cables shall supply the appropriate voltage to the unit terminals for starting.
−Cables’ capacity to transport the total system current draw.
IMPORTANT
- All cables for connection to the unit, as well as its accessories, must be H05 VV-F with PCV insulation in compliance with
EN60335-2-40.
- Disconnect all circuits from power supply before acting on energized components.
- Make earthing before any other electric connections.

18
N Neutral
1 – Power supply cable
2 – Auxiliary cable
L Phase
Lc Condensate Pump phase
H Heating
C Default contact condensate pump
V Cooling valve
V1, V2, V3 Motor speed
z
Connect power supply L(line), N(neutral) and (earthing) according to the wiring diagram and respect the polarities shown on the
bottom of the electrical boxes.
8.3 Terminal block
The unit can be equipped with two different screw clamp terminal connector types:
1 - U shape
2 - Hook shape
WARNING
When connecting power supply it is forbidden to put more than one wire end per screw clamp terminal with
«hook» shape connector or more than one wire end per screw clamp terminal with “U” shape connector (cf.
Daisy chain section).
Right hook side use is forbidden

19
WARNING
Daisy chain
WARNING: it is forbidden to supply other units from the terminal block.
8.4 Connecting a field-supplied controller
When installing a field-supplied controller, keep the following aspects in mind:
−Make sure the device and the electricity supply are switched off prior to installation / service.
−Do not install the controller in locations that can be affected by radiant heat or in places with high levels of sunlight.
−Do not install the controller behind doors or in corners.
−Install the controller approximately 1.5 m above the floor. In the event that the controller is intended for use by wheelchair
users, please refer to local regulations
−Protect the device from water/debris to avoid damaging the controller.
Mount the controller according to the following instructions:
1. If the controller is not to be embedded into the wall, proceed to the next step. Otherwise, first make sure that the
concealed wiring for the controller and the hole in the wall for installing a hollow installation box have been prepared. Then
lead the controller wiring into the hollow installation box and place the installation box in the hole in the wall.
2. If the controller terminal board is accessible from outside, proceed to the next step. Otherwise, open the controller housing
and separate its front part including the display from its back part including the controller terminal board.
3. Connect the wires of the Fan Coil wiring with the controller terminal board (→ Electrical connections, section 7.1 ).
4. Fix the one-part controller or the back part of the controller housing with screws to the installation box or, if no installation
box is to be used, to the wall.
5. For two-part controllers, re-connect the controller front part to the back part and close the controller housing carefully.
IMPORTANT
If the local control includes a remote ambient temperature sensor and/or a set temperature adjustment module, these shall
be connected with shielded cable and shall not pass through the same conduits as the power supply cables, because the
voltages induced may create reliability faults in the unit’s operation.
If a field-supplied thermostat or temperature sensor is to be used, mount it according to the following instructions:
−Choose the desired mounting position for the
sensor bulb on the Fan Coil unit's water inlet pipe
as shown in the scheme here on the right.
−At the chosen position, coat the pipe with heat
conducting paste to guarantee good thermal
transfer.
−Mount the sensor bulb at the chosen position on
the water inlet pipe.
−Wire the sensor bulb to the Fan Coil unit's terminal
board as described in the sensor's installation
instructions.
1– Cassette unit
2– Water outlet pipe
3– Water inlet pipe

20
Wiring diagram - Models PAW- FC*A-U***
AC Fan motor
Wire colouring code
BK
Black
OG
Orange
BN
Brown
YE
Yellow
RD
Red
GN
Green
BU
Blue
VI
Violet
GY
Grey
WH
White
Electrical data - Models PAW- FC*A-U***
PAW-
AC fan 2/4-pipe FC*A-U020
FC*A-U030 FC*A-U040 FC*A-U050 FC*A-U060 FC*A-U070
Power supply
Voltage V 230 230 230 230 230 230
Phase Single phase Single phase Single phase Single phase Single phase Single phase
Frequency Hz 50 / 60 50 / 60 50 / 60 50 / 60 50 / 60 50 / 60
Power consumption 2-pipe Lo/Med/Hi W 25 / 35 / 38 17 / 34 / 58 38 / 58 / 99 28 / 41 / 66 34 / 61 / 88 44 / 92 / 125
Power consumption 4-pipe Lo/Med/Hi W 25 / 35 / 38 17 / 34 / 58 38 / 58 / 99 - 34 / 61 / 88 44 / 92 / 125