Carrier Idrofan 42NL User manual

Translation of the original document
DUCTED FAN COIL UNITS
42NL & 42NH
INSTALLATION, OPERATING AND
MAINTENANCE INSTRUCTIONS

CONTENTS
1 - PRECAUTIONS ...............................................................................................................................................11
1.1 - Operating limits ........................................................................................................................................... 11
1.2 - Clearances required.................................................................................................................................... 11
1.3 - Receiving a shipment - installation methods............................................................................................... 11
1.4 - Supply voltage.............................................................................................................................................12
2 - SAFETY CONSIDERATIONS ..........................................................................................................................13
2.1 - General........................................................................................................................................................13
2.2 - Protection against electrocution ..................................................................................................................13
2.3 - General installation conditions ....................................................................................................................13
2.4 - Caution for the control of the unit ................................................................................................................14
2.5 - Regulations .................................................................................................................................................14
3 - INSTALLATION OF THE UNIT ........................................................................................................................15
3.1 - Installing the unit in the false ceiling............................................................................................................15
3.2 - Installation procedure..................................................................................................................................15
3.3 - Removal procedure.....................................................................................................................................16
3.4 - Safety considerations relating to nal shut-down........................................................................................16
4 - COMPONENTS AND MAINTENANCE ...........................................................................................................17
4.1 - Fan motor assembly....................................................................................................................................17
4.2 - Drain pan removal ......................................................................................................................................18
4.3 - Water coil ....................................................................................................................................................18
4.4 - Duct connection spigots ..............................................................................................................................18
4.5 - Duct connection rectangular anges...........................................................................................................18
4.6 - Optional lter and lter access ....................................................................................................................19
4.7 - Fresh air controller ......................................................................................................................................19
4.8 - Optional water ow control valves...............................................................................................................19
4.9 - Flexible pipe option .....................................................................................................................................21
4.10 - Optional electric heater .............................................................................................................................22
4.11 - Optional water sensor................................................................................................................................22
4.12 - Optional condensate pump .......................................................................................................................22
3

A B C
42NH/L - size 2 744 300 50
42NH/L - size 3 914 300 50
42NH/L - size 4 1114 300 50
42NH/L - size 5 1314 300 50
42NH/L - size 6 1314 345 50
42NH/L - size 7 1614 345 50
B
C
A
B
A B
42NH/L - size 2 744 300
42NH/L - size 3 914 300
42NH/L - size 4 1114 300
42NH/L - size 5 1314 300
42NH/L - size 6 1314 345
42NH/L - size 7 1614 345
C
A
B
4

A B
42NH/L - size 2 744 300
42NH/L - size 3 914 300
42NH/L - size 4 1114 300
42NH/L - size 5 1314 300
42NH/L - size 6 1314 345
42NH/L - size 7 1614 345
D
A
B
EFG
H I
0.5%
5

±0.5% ±0.5%
+
9a 9b
L
11a
11a
K
10a
10b
M
12b
12a
N
13a 13a
6

O
Ø16
26
Ø16
4w-v
2w-v
2w-v + B
40
40
40
B
B
B
G
G
G
C
C
C
C
C
H
D
I
E
J
F
F
F
F
K
7

R
BAS
60 50
75
100
70
80
90
DOWN
17a
17b
17c
Q
16a 16b 16c 16d
P
15a
15b
15d
15c
15e
8

S
18a
9

Figure titles and legends:
1 Clearance in mm without rectangular ange inlet
2 Clearance in mm with rectangular ange inlet
3 Clearance in mm with small or large plenum
4 Electrical danger pictogram
5 Caution hand hazard pictogram
6 General danger pictogram
7 Lifting unit for installation in a false ceiling
8/9 Levelling the unit
10 Condensate drain pipe
10a 20 mm/m fall in horizontal pipe run
10b 50 mm siphon
11 Several units connected to one condensate collector
11a 20 mm/m fall
12 Fan assembly removal
12a Removing fan access panel
12b Position of torx screws
13 Electric heater removal
13a Location of screw
14 Coil inlet/outlet positions, all sizes
1 Cooling water outlet (4 and 2-pipe coil)
2 Cooling water inlet (4 and 2-pipe coil)
3 Heating water outlet (4-pipe coil)
4 Heating water inlet (4-pipe coil)
5 Air vent
6 Water drain
7 Water outlet of 4w-v
8 Water inlet of 4w-v
9 Water outlet of 2w-v
10 Water outlet of 2w-v + B
2w-v Two-way valve
2w-v+B Two-way valve and balancing function
4w-v Four-way valve (= Three-way valve with integral by-pass)
Connections for two-way valve with balancing function :
- Size 2 and 3 : 3/4’’ diameter
- Size 4 and 5 : 1’’ diameter
Connections for other valves and coils:
- Size 2, 3, 4 and 5 : 1/2’’ diameter
- Size 6 and 7 : 3/4’’ diameter
15 Meaning of wires - proportional valve actuator (not applicable for valves
with balancing functions)
15a Black wire (230 V valve actuator), actuator rod rising
15b Green wire (24 V valve actuator), actuator rod rising
15c Brown wire, Actuator rod lowering
15d Actuator rod in high position
15e Actuator rod in low position
16 Waterow adjustment of optional 2-way valve with balancing function
16a Control knob removal
16b Knurled nut untightening
16c Waterow adjustment (white knob)
16d Knurled nut tightening in initial position
17 Optional airow controller
17a Air Damper
17b Fresh airow setting (in m3/h)
17c Airow adjustment screw
18 Coil protective caps removal
18a Protective caps (factory tted)
10

1 - PRECAUTIONS
Only specially trained and qualied technicians
and installers who have been fully trained on the
product concerned are authorized to install, to
commission and service this equipment.
In particular it is obligatory to disconnect all
power supplies to the unit and its accessories
before carrying out any work.
1.1 - Operating limits
1.1.1 - Cooling mode
Cooling mode - Operating Limits
Water circuit
Min. inlet Temperature >5°C ethylene /
propylene glycol rate < 40% Water side
pressure < 15,5 bar (1550 kPa)
Ambient
temperature and
humidity
T < 27°C / 65% relative humidity or
humidity weight < 14,7 g/kg dry air
Supply air
temperature
T > 12°C with maximum ambient humidity
conditions (14,7 g/kg dry air)
1.1.2 - Heating mode
Heating mode - Operating Limits
Water circuit
Max. inlet Temperature < 80°C ethylene /
propylene glycol rate < 40% Water side
pressure < 15,5 bar (1550 kPa)
Ambient
temperature and
humidity
T < 40°C
Supply air
temperature
T < 60°C with supply plenum and spigots
application
1.1.3 - Operating environment
The 42NH / 42NL has been designed for indoor
application in ‘urban’ conditions having a non-corrosive,
dust-free and non-marine environment.
The concentrations of the following chemicals must not
be exceeded in any event:
■SO2< 0.02 ppm
■H2S < 0.02 ppm
■NO, NO2< 1 ppm
■NH3< 6 ppm
■N2O < 0.25 ppm
Do not install a unit where ammable gases or products
of an acidic or alkaline character may be present. The
copper/aluminium coil or components inside the unit
could suffer irreparable corrosion damage in their
presence.
1.1.4 - Recommended coil water quality
At installation handover, and then periodically every
year, it is advised to analyse the water for bacteria
(detection of ferro-bacteria, H2S-producing and
sulphate-reducing bacteria) and chemicals (in order to
avoid problems due to corrosion and scaling).
The water circuit must include all the necessary
elements for the treatment of the water: lters, additives,
intermediate exchangers, purges, drains, isolating
valves, etc., according to the analysis results.
The results must be in accordance with the values
shown below:
■ Total hardness in mmol/l: 1 < mmol/l < 1.5
■Chloride [CL-] < 10 mg/litre
■Sulphate [SO42-] < 30 mg/litre
■Nitrate [NO3-] = 0 mg/litre
■ Dissolved iron: < 0.5 mg/litre
■ Dissolved oxygen: 4 < [O2] < 9 mg/litre
■Carbon dioxide [CO2] < 30 mg/litre
■Resistivity: 20 Ohm·m< Resistivity
< 50 Ohm·m
■ pH: 6.9 < pH < 8
1.2 - Clearances required
Without rectangular ange inlet : Fig.1
With rectangular ange inlet : Fig.2
With plenum : Fig.2 and Fig. 3
NOTE : All informations about dimensions and
weights are available in the PSD documentation on
Carrier Webportal
1.3 - Receiving a shipment -
installation methods
When receiving a shipment, check the condition of the
goods and report any damage in transit to the shipping
company. Do not unpack the units until just before they
are due to be installed, and make sure they are as close
as possible to the installation site when unpacking them.
Do not place heavy articles of any sort on them.
11

1.4 - Supply voltage
Check that the supply voltage and frequency correspond
to the values of the unit to be installed.
Operating Limits - Electrical input
Low
consumption
- EC brushless
Motor
Min : 207V
Max : 253 V
60 or 50 Hz -1ph
Multispeed -
AC motor
Min : 207V
Max : 253 V
60 or 50 Hz -1ph
(60Hz not available for 42NH3_5)
NOTE: All performances data certied by Eurovent
are based on 50Hz application. Carrier doesn’t
ensure the same performances when the unit
operates at 60Hz; the RPM and power input of the
fan-motor are usually higher.
WARNING: Failure to take proper account of the
above advice and unauthorised modication of the
electrical connections will render the Carrier
warranty on the product null and void.
1 - PRECAUTIONS
12

2 - SAFETY CONSIDERATIONS
WARNING: Switch off the main electrical power
supply to the unit and accessories (if installed)
before doing any work on the unit.
2.1 - General
Installing, commissioning and servicing of the various
component (unit, control system, hot and cold water
system, air distribution system) can be dangerous
unless certain aspects of the installation, such as the
presence of mains electricity and hot or cold water in
the air conditioning equipment, are taken into account.
Only specially trained and qualied technicians and
installers who have been fully trained on the product
concerned are authorised to install, commission and
service this equipment.
During servicing work, it is essential to apply all
recommendations and instructions given in service
leaets, on labels or in the instructions delivered with
the equipment, and to comply with any other relevant
instructions.
Denition of the pictograms used:
■Electrical danger - Fig.4
■Caution hand hazard - Fig.5
■General danger - Fig.6
Comply with all safety rules and regulations currently in
force. Wear eye protectors and work with hand gloves
and any individual protection equipment following local
legislation. Take care when moving or positioning of the
equipment.
2.2 - Protection against electrocution
Only personnel qualified to perform electrical and
maintenance work may make electrical connections. In
particular it is obligatory to disconnect all power supplies
to the unit and its accessories before carrying out any
work. Disconnect the main power supply with an
isolating device (not supplied by Carrier).
IMPORTANT: The components, which make up the
different control loops described in this manual
include electronic items. As such, they may
generate or be harmed by electromagnetic
interference unless they are installed and used in
accordance with these instructions. The components
making up these control systems conform to the
requirements of electromagnetic compatibility in
residential, commercial and light industrial areas.
They also comply with the low-voltage directive.
If the product is supplied without a Carrier control device,
verication of EMC conformity is the responsibility of
the installer.
2.3 - General installation conditions
IMPORTANT: The Carrier numeric controller, power
module, or in general units tted with controls loops
must have an isolating device upstream (for
example a double-pole circuit breaker). If necessary,
an easily operated emergency stop device (such as
a punch-button switch) must cut off the power to
all equipment. The installation must be equipped
with a device to protect against earth faults. The
disconnect device must simultaneously disconnect
the two poles (phase and neutral), and have a
distance of at least 3 mm between the contacts, in
compliance with the installation instructions. The
mains power cable must have 3 conductors (blue,
brown, green/yellow) and its cross section and type
must comply with the specications set out by the
applicable EN or IEC standard. Refer to the selection
sheet or the name plate to determine the maximum
input current. These devices are not supplied by
Carrier.
In general terms the following rules must be applied:
Upstream over voltage protection
Size (42NL & 42NH) Without Elec. Heater
2_5; 2_9 T2A
3_5; 3_9 T2A
4_5; 4_9 T2A
5_5; 5_9 T3A
6_5; 6_9 T3A
7_9; 7_9 T3A
Size (42NL & 42NH)
With Elec. Heater
[0-1400W] [1500-
2400W]
[3000-
3200W]
2_5; 2_9 T10A NA NA
3_5; 3_9 T10A NA NA
4_9 T10A NA NA
4_5 T10A T16A NA
5_5; 5_9 T10A T16A NA
6_5; 6_9 T10A T16A T20A
7_5; 7_9 T10A T16A T20A
■Electrical connections must be made according to
the wiring diagram provided with the unit and the
installation and operation manual of the controller.
■ Units must be provided with over-voltage protection
upstream (not supplied by Carrier).
■The power disconnection device must be clearly
labelled to identify which items of equipment are
connected to it.
■ The wiring of the components which make up the
different control systems and the communication
buses must be carried out in accordance with the
latest rules and regulations by professional installers.
13

■ The power supply cable must be doubly insulated
and xed using a cable clamp. A hole is provided for
this purpose in the plastic Carrier controller housing.
The cable must be clamped on the outer insulation.
■The control loop components must be installed in an
environment, which conforms to their index of
protection (IP).
■The maximum level of pollution is normally pollutant
(level 2) and installation category II.
■The low-voltage wiring (communication bus) must be
kept physically separate from the power wiring.
■In order to avoid interference with the communication
links:
-Keep low-voltage wiring away from power cables
and avoid using the same cable run (a maximum
of 300 mm in common with the 230 V a.c., 30 A
cable).
-Do not pass low-voltage wires through loops in
the power cables.
-Do not connect heavy inductive loads to the same
electrical supply (circuit breaker) used by the
controllers, power modules or speed controllers.
-Use the screened cable type recommended by
Carrier and make sure all cables are connected
to the controllers and power modules.
2.4 - Caution for the control of the
unit
IMPORTANT: It is not permitted to connect several
units to the same control device (electronic NTC
controller, WTC controller, or any other third party
controller). Carrier electronic Thermostat type A&B
for AC motors require additional accessory board
to allow master/slave function. Carrier electronic
Thermostat type C&D for EC motors can be
connected upto 10 units, refer to thermostat
installation manual instructions.
2.5 - Regulations
Declaration of Conformity UE
This unit complies with the provisions of European
Directives:
2006/42/EC (Machinery)
2014/30/EU (EMC)
2011/65/EU (RoHS)
Electronic Equipment Regulations 2012
2009/125/EC (Eco Design) & regulation 327/2011/
UE
REGULATION (EC) No 1907/2006 (REACH)
UK Declaration of Conformity
This unit complies with the requirements of:
Supply of Machinery (Safety) Regulations 2008
Electromagnetic Compatibility Regulations 2016
The Restriction of the Use of Certain Hazardous
Substances in Electrical and Electronic Equipment
Regulations 2012
The Ecodesign for Energy-Related Products and
Energy Information Regulations 2019, and following
amendments
UK REACH Regulations 2019
UK Importer:
Toshiba Carrier UK Ltd, Porsham Close, Roborough,
Plymouth, PL6 7DB
2 - SAFETY CONSIDERATIONS
14

3 - INSTALLATION OF THE UNIT
3.1 - Installing the unit in the false
ceiling
The positioning of the unit must not create an obstacle
that may lead to an unequal distribution and/or return
ow of the air. The ceiling must be sufciently even to
allow a simple installation without danger from the unit.
The supporting structure must be able to carry the unit
weight and prevent deformation, breaks or vibrations
during operation.
INSTALLATION PRECAUTIONS: During the
installation process, remove all debris and
construction material from the ducts to prevent any
damage to the unit.
3.2 - Installation procedure
NOTE: The fan-coil units are delivered upside down
when stacked on a pallet.
■ Position the unit close to where it is to be installed in
the ceiling void. For installation in a false ceiling use
a hydraulic lift and a folding ladder to make the task
easier (Fig. 7).
■Check that the clearances around the unit are
sufcient to allow easy maintenance. Please refer to
the diagram that shows the service clearances.
■Mark the position of the threaded hangers on the
ceiling (if several units need to be installed, it may
be advisable to produce a drilling template). The
method of xing the threaded hangers (not supplied
by Carrier) depends on the ceiling type (maximum
diameter of the threaded hangers is 10 mm). Once
the threaded hangers are xed to the ceiling, tighten
the rst nuts.
WARNING: When moving the units, do not use water
pipes, condensate drain pan, valves or exible pipes
to lift them.
‘Without lter’ unit must be connected to an air
ductwork. It is not allowed to operate the unit
without any lter and with a free inlet at the same
time.
Lift the unit and align it on the threaded hangers, insert
the second nuts and tighten them slightly.
NOTE: At this point do not tighten the nuts fully and
do not clamp the unit up to the ceiling (leave a space
between the ceiling and the unit). The nuts will be
adjusted nally, when the unit has been connected
to the pipework and ducts and levelled.
Level the unit (Figs. 8 and 9).
Adjust the hanger nuts so that the unit is inclined 0.5%
towards the condensate drain pan. In the other direction
(air ow direction) the unit must be perfectly level (Figs.
8 and 9).
Wiring diagram for connecting several units
Incorrect wiring for several units
LL
F4
L
LL N
NN
NN
Correct wiring for several units
L
L
L
L
L
L
L
N
N
N
N
N
N
N
15

Condensate drain pipe (Fig. 10): Use a exible pipe with
an inside diameter of 16 mm and provide a constant fall
of 20 mm/m over the whole horizontal pipe run. Install
a 50 mm (minimum) siphon to prevent gases and odours
from owing back into the ceiling void.
WARNING: After drain pipe connection, control
clamping of the drain pipe and be sure there is no
water leakage.
If several units are connected to a common collector, a
device must be installed (Fig. 11). Before operating the
unit, ensure that the water flows into the internal
condensate drain pan by pouring some water into it. If
problems are detected, check the drain pipe slope and
look for possible obstructions. In all cases the
connection duct(s) at the unit outlet must be insulated
to prevent any condensate formation on the walls.
NOTE: The pressure losses of these ducts must be
compatible with the unit performance. The duct
must be as smooth as possible. Avoid sharp bends.
Check that there are no leaks or kinks, and that there
is no dirt or installation debris inside the ducts.
Debris within the ducts might damage the fan wheel
and the damper in the air di󰀨users.
When installation is complete - i.e. when the unit is
attached to the ceiling, air ducts are complete, water
mani-folds are in position with stop valves ready on the
connection stubs, and electrical installation is prepared
- then connect the water pipe (1/2” gas screw connector
for size 2 to 5 ; 3/4” gas screw connector for size 6 and
7).
WARNING: Be sure that the coil protective caps are
removed before connecting the water pipes (see
Fig. 19).
NOTE : Each fan-coil units shall be connected with
water exible pipes in order to avoid any damage
due to vibrations.
Ensure that a gasket (not supplied by Carrier) is installed
between the screw connector and the stop valve.
When all units are installed, open the stop valves on
the manifolds, bleed and then pressurize the circuits.
To bleed the coils, slightly loosen the bleed screws. The
installation can then be started.
NOTE: Do not switch on the power until all
connections are made and earthed.
3.3 - Removal procedure
Switch o󰀨 the unit power supply at the isolator
provided for the purpose during installation (isolator
not supplied by Carrier).
■Disconnect the power supply and connection cables.
■Close the isolating valves on the manifolds.
■ Disconnect the exible water pipes by unscrewing
the gas connectors.
WARNING: Since the exible water pipes do not
have drain valves, a receiver must be provided to
allow the cooling coil to be drained.
■Disconnect the supply air ducts.
■ Disconnect the exible condensate drain pipe. Drain
the siphon into a suitable vessel.
■ Support the unit lightly and release it by unscrewing
the four nuts on the threaded hangers. Lower the unit
carefully.
3.4 - Safety considerations relating to
nal shut-down
Separate the units from their energy sources, allow them
to cool down and then drain completely.
DISMANTLING: see §3.3.
Respect the local environmental laws and regulations.
Presence of waste electrical and electronic equipment
(WEEE): At the end of its life, units must be disassembled,
with any contaminated uids removed by professionals,
and then processed via approved channels for waste
electrical and electronic equipment (WEEE).
Check whether any part of the unit can be recycled for
another purpose.
Sort the components according to their material for
recycling or disposal, in accordance with regulations in
force.
Materials to be recovered for recycling - Steel - Copper
- Brass - Aluminium - Plastics - Insulation.
The proportions of materials for each unit are listed in
the Product Environmental Prole (PEP) available at
the following website: http://www.pep-ecopassport.org/
fr/consulter-les-pep/ or on request from our departments.
Any contaminated fluids must be disposed of by
specialist professionals.
3 - INSTALLATION OF THE UNIT
16

4 - COMPONENTS AND MAINTENANCE
4.1 - Fan motor assembly
4.1.1 - Fan assembly removal procedure
WARNING: Disconnect the power supply to the unit
before carrying out any work on the unit.
Identify and note the wired fan speeds. If the fan
develops a fault the whole assembly must be removed
and replaced (Fig. 12).
■ Remove the lter.
■Remove the fan access panel.
■ Disconnect the fan assembly power supply cables
(power and control wiring for variable-speed motor).
■If necessary remove the controller (xed with screws)
to gain access to the maintenance screws of the
panel supporting the fan.
■The fan assembly and its panel are held in place by
four screws. Remove these screws and slide the
assembly down.
■Remove the fan motor assembly.
NOTE: Be careful not to touch the fan blades during
the removal process to avoid unbalancing the fans.
■ For units with the electric heater option, disconnect
the power supply cable to the heater. Withdraw the
cable through the cable gland.
■ Unscrew the electric heaters.
■Replacement of the fan motor assembly is by the
reversal of the above procedure.
WARNING: The electrical connections to the fan
motor must be made in accordance with the labels
on the connector block
4.1.2 - Capacitor replacement procedure
Disconnect the power supply to the unit before
carrying any work on the unit.
■ Remove the lter.
■Remove the fan motor assembly access panel.
■Remove the capacitor that is attached to the motor
chassis assembly.
■Disconnect the capacitor by withdrawing the at
spade connectors from the back of the capacitor.
■Replacement of the capacitor assembly is by the
reversal of the above procedure.
4.1.3 - Fan wiring
For any modications of the wiring harness, refer to the
fan wiring diagrams provided with the units.
With the optional electrical box, three of the available
five or six speeds of AC motor are connected -
(maximum speed = R1, minimum speed = R5 for 42NH
/R6 for 42NL).
When the unit is delivered with an WTC or a NTC
controller, for AC motor, three of the 5 or 6 speeds are
connected. Speeds arrangement can be changed on
site according to the electrical diagram.
WARNING: With the optional electric heater a
minimum air ow must be maintained (see tables
below).
Damages may occur if the minimal speed
recommendation is not followed.
Minimum speed 42NH / (Minimum air ow in m3/h)
Size Multispeed AC Motor With Elec. Heater
0-1000W 1600-2000W 3200W
2_5 R5 (70 m3/h) NA NA
3_5 R5 (180 m3/h) NA
4_5 R5 (340 m3/h) NA
5_5 R5 (300 m3/h) NA
6_5 R5 (300 m3/h)
7_5 R5 (460 m3/h)
Minimum speed 42NH / (Minimum air ow in m3/h)
Size EC Motor With Elec. Heater
0-1000W 1500-2400W 3000-3200W
2_9 3V (70 m3/h) NA NA
3_9 3V (180 m3/h) NA
4_9 3V (275m3/h) NA
5_9 3V (300 m3/h) NA
6_9 3V (180 m3/h)
7_9 3V (300 m3/h)
Minimum speed 42NL / (Minimum air ow in m3/h)
Size Multispeed AC Motor With Elec. Heater
0-1000W 1600-2000W 3200W
2_5 R6 (70 m3/h) NA NA
3_5 R6 (180 m3/h) NA
4_5 R6 (340 m3/h) NA
5_5 R6 (300 m3/h) NA
Minimum speed 42NL / (Minimum air ow in m3/h)
Size EC Motor With Elec. Heater
0-1000W 1500-2400W 3000-3200W
2_5 3V (70 m3/h) NA NA
3_5 3V (180 m3/h) NA
4_5 3V (275 m3/h) NA
5_5 3V (300 m3/h) NA
17

4.2 - Drain pan removal
WARNING: Disconnect the power supply to the unit
before carrying out any work on the unit.
■ Disconnect the exible condensate drain pipe held
in place by a collar (the collar is not supplied by
Carrier).
■Remove the metal sheet part under the pan by
loosing the two lateral screws and one additional front
screw (see g. 1, 2 and 3)
■Pull out the drain pan under the unit by sliding it from
its support plate. Remove drain pan from bottom of
unit.
■During the pan removal and maintenance, lay the
end of the coil on the metal support plate to prevent
any damage to the casing (to remove the coil see
procedure in chapter 4.3.).
■Replacement is by the reversal of the procedure
described above (check that the coil lays at the center
of the drain pan as initially)
■Control clamping of the drain pipe and be sure there
is no water leakage.
4.3 - Water coil
4.3.1 - Coil removal procedure
WARNING: Disconnect the power supply to the unit
before carrying out any work on the unit.
■Close the isolating valves on the manifolds.Empty
the water in the unit by opening the drain valve (see
Fig. 14)
■Unscrew the union nuts to disconnect the exible
water pipes.
■Remove the valve actuators taking care to identify
the cooling and heating valves.
■ Disconnect the exible condensate drain pipe held
in place by a collar (the collar is not supplied by
Carrier).
■ Remove the two-way or four-way water ow control
valve bodies. Depending on the unit conguration
the four-way valve coupling may be tted with a
heating/cooling changeover switch. If so, do not
remove it.
■ Loosen the four xing screws. Pull out the drain pan
and coil assembly (the drain pan remains attached
to the unit for approximately 100 mm) until the coil is
completely detached. Then remove the coil from the
drain pan.
■Replacement is by the reversal of the procedure
described above. Ensure that all gaskets are changed
(new gaskets tted) and that the inlet and outlet
connections to the coil are made correctly using an
appropriate sealing compound applied to the valve
body. Bleed all air from the coil during relling.
NOTE : if necessary, the coil can also be removed
from under the unit along with the drain pan (see
chapter 4.2. “Drain pan removal”)
WARNING: Take care when tightening the valve
body to the coils (15 N·m is sufcient) to ensure
they are not damaged.
NOTE: The orientation of the coil cannot be
reversed.
4.3.2 - Coil inlet/outlet and cooling/heating
side positions
Water inlets/outlets, all sizes : Fig. 14.
WARNING: Carefully observe the direction indicated
by the arrow on the valves, based on the valve type.
4.4 - Duct connection spigots
These are manufactured from high density plastic with
a VO re rating, more or less equivalent to class M1
(French standard). They are encased inside the unit.
The ducts should be xed to these spigots using circular
collars or adhesive. Screws and rivets should not be
used.
WARNING: In order to guarantee good air tightness,
the duct should overlap the whole of the spigot.
Make sure that the maximum supply air temperature
does not exceed 60°C.
Do not lift or support the unit using the spigots, place
loads on the spigots during installation or operation.
4.5 - Duct connection rectangular
anges
When connecting rectangular anges to the inlet and
the outlet make sure that the duct is pushed closely the
unit.
4 - COMPONENTS AND MAINTENANCE
18

4.6 - Optional lter and lter access
4.6.1 - Description
The Carrier unit is tted with G1 lter as standard.
A G3 or M5 lter is also available as an option
G3 and M5 lters both comply with the M1 re class.
Different lter access are available:
■ Unit without rectangular ange air inlet (plain inlet):
access is from the rear of the unit.
■ Unit with rectangular ange air inlet or with return air
plenum: access is from below (trapdoor).
4.6.2 - Air lter replacement
Air lters should be changed regularly. Filter life depends
on the rate at which the lter becomes clogged, which
depends upon the cleanliness of the working
environment.
If clogged lters are not changed they can increase the
air pressure drop, trapped dust particles may be given
off and entrained in the air supply, and the general
performance of the unit may be degraded (as the air
ow reduces).
NOTE: When installing a unit in a ceiling void, check
that no T-bars will obstruct filter access and
removal.
4.7 - Fresh air controller
4.7.1 - Fresh air controller with (adjustable)
constant air volume
The unit can be tted with three ranges of constant and
adjustable fresh air ow. The 3 ranges are 15 to 50 m3/h,
50 to 100 m3/h and 100 to 180 m3/h.
The diameter of the spigot housing the fresh air ow
controller is 125 mm. The fresh air controller can be
modied on site by unscrewing and repositioning the
damper of the controller. See g 17.
IMPORTANT: If the unit is tted with a return air
temperature sensor, the constant fresh air ow rate
must not exceed 50% of the supply air ow delivered
by the unit at minimum speed.
NOTE: To operate correctly the constant fresh air
ow controller requires a di󰀨erential pressure in the
range of 60 Pa to 210 Pa.
4.7.2 - Fresh air controller with variable air
volume
The unit can be equipped with a variable fresh air ow
controller from 0 to 55 l/s (0 to 200 m3/h).
This is connected to the numeric Carrier controller and
can regulate the fresh air intake in two ways:
■ Either using a xed rate set by the installer that can
be recongured as required
■Or based on the CO2level; in this case it is connected
to a CO2sensor via the Carrier numeric controller
(the CO2sensor is located opposite the fresh air
inlet).
NOTE: With the variable fresh air ow controller the
upstream pressure in the fresh air duct must be 180
Pa. It is available as an accessory.
4.7.3 - Fresh air ltration
If the unit is provided without any lter or if the fresh air
inlet is tted in the base unit or in the return plenum, it
is the responsibility of the installer to check if the fresh
air is ltered beforehand.
4.8 - Optional water ow control
valves
These valves are either two-way or four-way type (three-
way with integral bypass). The body of the valve is
designed to withstand a 15.5 bar (1550 kPa) bar
operating pressure.
With this option, the couple (valve + actuator) is usually
normally closed (NC).Thus, the water ow is null in case
of power cut. To ll the installation, to equalise the water
circuits and to purge the units, the actuators must be
connected to the power supply and the valves must be
opened via the controller (thermostats or BMS).
For the replacement of these components refer to the
chapter 4.8.4. - ‘‘Actuator replacement procedure’’.
4 - COMPONENTS AND MAINTENANCE
19

4.8.1 - Optional balancing valves
Two-way valve with waterow balancing function is embedded with a differential pressure controller (with or without
pressure test points to control the waterow settings). The setting of the valve is shown in Fig. 16.
The manual control knob (16a) is ready tted to protect valve stem and pre-set mechanism and facilitates manual
control of valve during commissioning.
Setting procedure:
■ Remove control knob from the valve (16a)
■ Loosen knurled nut (16b).
■ Adjust the desired dial setting with the white knob (16c)
-See table below.
■ Retighten knurled nut by hand (16d).
Waterow to adjust [l/h]
1/2’ valve Not Standard
3/4’ valve Available
1’’ valve Available Available
ON/OFF actuator Not Standard Available Available
Moduling / 3p actua. Not Standard Available Available
Waterow range : 200 l/h (*) 600 l/h (*) 1200 l/h (*) 1600 l/h (*)
MINI NA NA NA NA
0,2 NA NA NA NA
0,4 NA NA NA NA
0,5 30 100 NA NA
0,6 35 115 200 220
0,8 40 130 260 290
150 160 310 250
1,2 60 180 380 420
1,4 70 210 430 480
1,6 80 240 490 550
1,8 90 270 550 610
2100 300 610 680
2,2 110 320 660 740
2,4 120 350 730 810
2,6 130 380 780 870
2,8 140 410 840 940
3150 440 900 1000
3,2 160 460 960 1070
3,4 170 490 1010 1130
3,6 180 520 1070 1200
3,8 190 550 1130 1260
MAX 200 575 1190 1330
(*): Maximum specied water ow on the valve body
WARNING: The valves have to be open when ushing or pressure testing the system. Strong pressure
impacts can damage closed valves.
Differential pressure across the valve’s control path is not allowed to exceed 400 kPa.
4 - COMPONENTS AND MAINTENANCE
20