Lennox 20 Instruction manual

CHILLED
WATER
CASSETTE
INSTALLATION-OPERATION
&
MAINTENANCE MANUAL

1
CONTENTS
• PRODUCT RANGE
• GENERAL INFORMATION
• SPECIFICATION
• ELECTRICAL CONNECTIONS
• UNIT DIMENSIONS
• DRAIN PIPEWORK
• INSTALLATION
• CONTROL PANEL
• INSTALATION OF DIFFUSER AND INLET GRILLE
• MAINTENANCE
• AIR DISTRIBUTION
• OPTIONS
• FAULT ANALYSIS
• POINTS TO KEEP IN MIND
PAGE
2
3
4-5
5
6
7
7-8
9
10
11-12
12
13-14
14
15
TABLE OF CONTENTS
Congratulations, you have made a wise choice with the purchase of your Lennox chilled water ceiling
cassette.
This product has been designed, assembled and supplied in one of our world class manufacturing facilities
and we feel sure that it will meet your expectations.
Lennox an international organisation with world wide distribution takes pride in supplying you with this
product.

2
PACKING CONTENT
PRODUCT RANGE
MODEL V / Ph / 50 Hz NOMINAL CAPACITY KW
2,0 2,8
6,0
230 V - 1Ph
CWC 020 230 V - 1Ph
230 V - 1Ph
230 V - 1Ph
CWC 030
CWC 040
CWC 050
COOLING HEATING
3,5
4,4
5,2
4,4
5,1
Cassette unit
Diffuser panel Installation manual Hanging bracket insulation
Screws and washers
MANUAL DE FUNCIONAMIENTO
LENNOX
Setting up
template
(*)
(*) Packed separately

3
GENERAL INFORMATION
The CEILING CASSETTES are designed to operate with chilled and hot water. They
provide both cooling and dehumidification in cooling mode and heating in the latter,
cleaning and filtering the air in the process. Electrical heating elements are available
as an option on all units excluding the CW050. The units are available with cooling
capacities of 2000 to 5200 W and heating capacities of 2800 W to 6000 W.
The unit chassis is made of galvanised steel and is
fully insulated both inside and out.
Made of copper tubes and aluminium fins. Coils
have been designed and manufactured to ensure
maximum efficiency.
The units are supplied with a 3 speed centrifugal
fan. The impellor blades have been designed
specifically for this type of units ensuring
exceptionally low sound levels and the motor is
protected with internal thermal protection.
The air discharge louvres change position in
automatic or manual mode, (according to versions).
In the case that this function has not been
incorporated the position of the louvres can be
adjusted manually.
The unit is designed, with serviceability in mind, and
all components are easily accessible. A drip tray
collects condensate which is removed by means of
a condensate pump.
Made in decorative plastic, with a smooth finish.
Internal insulation prevents condensation from
forming.
Four louvres ensure air distribution.
A polypropylene washable air filter is incorporated
in the unit it is easily accessible for maintenance.
CABINET
ELECTRIC CIRCUIT
HEAT INTERCHANGE
INTERNAL COMPONENTS
OPTIONS
FAN
AIR DISTRIBUTION
The electrical panel is provided with a terminal block
which provides connection of mains power or to a
control box. A fused isolator is not included and
where required shall be installed by others.
-Electric heater. (Excluding CW-050)
-Fresh air kit.
Duct connection.
Fresh air fan.
Duct supports.
-Discharge of air to an adjacent room kit.
Duct connection.
Duct supports.
-Water control valve kit with 2 way or 3 way
proportional control valves.
-Auxiliary drip tray.
DIFFUSER PANEL
AIR FILTER

4
(1)Inlet air temperature:: 27ºC BS / 19ºC BH
(2)Inlet air temperature: 20ºC BS
(3)Inlet air temperature: 20ºC BS
(4)Fan high speed. Power supply 230V-1ph-50Hz 230V-1ph-50Hz
(*)Sound level has been tested at a distance of 2 m from the unit, at standard conditions
CORRECTION FACTORS FOR MEDIUM AND LOW SPEED
The given values have been calculated for a high-speed fan. For a different speed, the given values must be
multiplied by the following correction factors.
Low speed Medium speed High speed
Air flow
Heating capacity
Cooling capacity
Water temperature: 7/12º C
Water temperature: 50º C
Water temperature: 70/60º C
m /h
3
SPECIFICATIONS
UNIT
Total cooling capacity
Sensible total capacity
Chilled water flow rate
Water content
Heating capacity
Hot water flow rate
Air flow (max. / min)
Fan power consumption
Running current
Electric heater power consumption
Running current with electric heater
2 PIPES SYSTEM
Heating capacity
Hot water flowrate
Hot water pressure drop
Pipe connections
Sound level (Lp)
Diffuser dimensions
Cassette dimensions
Diffuser weight
Cassette weight
5200
3750
900
22
CWC 050
2000 3500
kPa(1)
W(1)
l
4400
1650 2750 3400
345 600 745
11 17 26
CWC 020 CWC 030 CWC 040
W(1)
l/h(1)
2,20,7 1,2 1,5
6000
900
22
2800 4400
kPa(2)
5100
345 600 745
11 17 26
W(2)
l/h(2)
9446 46 69
0,5
----
----
A
A(4)
0,2 0,2 0,3
1,5 2 2
6,5 8,7 8,7
W(4)
W
9600
825
18
920/650
4700 7000
kPa(3)
7900
404 600 680
13 17 22
650/445 650/445 880/600
W(3)
l/h(3)
F 1/2'' GF 1/2'' GF 1/2'' GF 1/2'' G
dB(A)(*)
40/32 44/3840/32 48/39
3
Kg
298x575x575
3 3 3
24
Kg
21 22 23
HxLxW(mm)
HxLxW(mm)
48x720x720 48x720x720 48x720x720 48x720x720
298x575x575 298x575x575 298x575x575
0,8
0,68
0,77
0,9
0,85
0,86
1
1
1
Chilled water pressure drop
Hot water pressure drop

5
10% x 1,07
20% x 1,12
30% x 1,20
MODEL COOL WATER COOL AND HOT WATER VOLTAGE
50Hz
CWC020 / CWC030
CWC040 / CWC050
FLOW RATE
l/h
PRESSURE DROP
CWC 020 CWC 030 CWC 050CWC 040
250
400
345
450
500
300
550
650
700
745
600
800
1000
900
950
850
6
8,3
11
13,6
17 9,8
12
14
17 17,8
19 20,5
21 23 14
24 26 16
29,5 17,5
33 19.5
36,3 22
24
26----
----
----
----
----
----
----
---- ----
--------
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
5 7 81 2 3
0 1 2 3 42 51 2
230V/50HZ 1Ph + N
4 6
6 7 8
11
22
THERMOSTAT
CASSETTE UNIT
CHILLED WATER CHILLED WATER AND HOT WATER
1
1
2
2
CWC
5 7 81 2 3
0 1 2 3 42 51 2
230V/50HZ 1Ph + N
4 6
6 7 8
ELECTRIC WIRING DIAGRAM
For electrical connection refer to wiring diagram
in the unit.
SPECIFICATIONS
Ethylene glycol % Pressure drop
ELECTRICAL CONNECTIONS
WATER PRESSURE DROP
Nº OF WIRES X SECTIÓN
230 V / 1Ph
Power supply
Thermostat
connections
As the percentage of glycol increases the
standard pump flow decreases due to the
increased pressure characteristics. This
means that the cooling and heating duties
will decrease. As a result the pressure
drop must be multiplied by the coefficient
shown in the table below.
POWER SUPPLY WIRING
This equipment must be installed in accordance
with national regulations. A suitable means of
disconnecting all supply poles must be provided
in the power supply wiring. The power supply must
incorporate suitably rated fused or circuit breaker
protection.
2
3 X 1,5mm 2
3 X 1,5mm
2
7 X 1,5mm 2
8 X 1,5mm

6
23,5
91
121
247
32 72
40
Air vent
Outlet water connection 1/2” G
Inlet water connection 1/2” G
4 x hanging brackets (M 8)
Electrical cable entry point
Condensate pump flexible
hose 10mm ID 15mm OD
Drain tube
16mm OD
O 150
575
284
123
143
196
273
Fresh air knockout panel
for branch duct.
CASSETTE UNIT
DIFFUSER PANEL
298
Branch duct knockout hole, to
supply air into adjacent area.
O 68
O 150
UNIT DIMENSIONS (mm.)
DETAIL A
30
720
489,74
540
720
DETAIL A
30,6 54,66
17,5
17,5
489,74
54,66 30,6

7
(**) INSTALLATION CLEARANCES
2%
Máx.200mm
DRAIN PIPEWORK
INSTALLATION METHOD
2. Ensure there is sufficient space around the unit to service it.
Where there is a false ceiling ensure that there is enough space
to provide access. Where there is a false, panelled ceiling ensure
that there is sufficient space adjacent to remove the panels.
1. The unit should be positioned centrally within the room. The
ceiling must be horizontal to ensure that the condensate water
can drain away thoroughly. The unit must be installed in a
position where there is sufficient strength in the structure to
support the weight of the unit.
CONDENSATE PUMP
FLEXIBLE HOSE
DRAIN TUBE
DRAIN TUBE
• The drain tube is connected to drip tray.
• This drain tube is supplied with a cap; the cap can be removed when it is necessary to remove any water that
accumulates in the drip tray.
• The unit is fitted with a condensate pump to ensure condensate removal.
• To insure that there is condensate flow, the drain tube must be installed with a fall of 2 % without obstructions,
or without rising sections.
• To avoid any unpleasant odours from the drainage system a trap must be fitted with a trap depth of no less than
50 mm.
• The condensate pump has a maximum lift of 200 mm. The rising tube must always be vertical.
• On completion the drain line must be insulated.
CONDENSATE PUMP FLEXIBLE HOSE
298
720
720
Min. 500 (**)
Min. 500 (**)
2%
50
Cassette
unit
Diffuser panel
308

8
Setting up
template
489,74
489,74
54,66
30,6
575
25
25
30,6
54,66
540
17,5 17,5
575
Cassette
unit
Diffuser panel
Suspension rots M-8
1
2
1
1
2
1
2
Nut
whasers
Fixing points
INSTALLATION METHOD (CONTINUED)
8. The cassette brackets hook over the washer.
Tighten the cassette, with the lower nuts.
7. When lifting the cassette into position care should
be taken not to lift the unit by, the drip tray, water
connection, drain tube; which could be damaged.
The cassette should be lifted by the hanging brackets.
The hanging brackets should be insulated, with
the supplied insulation.
9. Check to ensure the unit is level. The drain will
then automatically be lower than the rest of the drip
tray.
10. Tighten the nuts on the suspended rods to ensure
a distance of 25 mm between the bottom face of the
body of the unit and false ceiling.
4. Install the suspension rods to the ceiling, the rods
should have three nuts and two washers, as in next
figure. The setting up template can be used to
indicate the position for the suspension rods.
5. The condensate connections should be positioned,
before that the unit is installed.
NOTE: Before marking the fixing points to the ceiling,
ensure that the unit is positioned in the correct
orientation taking into account of where the electrical
cabinet is required. Ensure that water pipes can be
run easily. When the unit is fixed it is not easy to
change position.
6. To facilitate the connections of water pipes and
the drain tube is advisable to disassemble the
supporting bracket situated on this corner. Once the
installation is completed; the bracket must be
reassembled.
3. Cut the false ceiling, to a maximum dimension of
625x625 mm. For a panelled ceiling removes one
panel of 600x600 mm.

9
WARNING
Electric shock hazard can cause injury or death. Before
attempting to perform any service or maintenance on the
unit, turn OFF the electrical power, and check that the fan
has stopped.
Cover
plate for
electrical
board
Terminal
plate cover
23
1
CONTROL PANEL
Removing the corresponding plate cover screws gives
access to the electrical board and terminal plate, as indicated
on the drawing.
For electrical connection refer to wiring diagram in the unit.
ELECTRICAL WIRING DIAGRAM
ACCESS TO THE ELECTRICAL COMPONENTS OF THE UNIT
Electrical inlets, power supply and remote
controller
Terminal plate
Electrical connections (it depends on versions)
1
2
3

10
Insulation
WARNING
Electric shock hazard can cause injury or death. Before
attempting to perform any service or maintenance on the unit,
turn OFF the electrical power, and check that the fan has
stopped.
Display unit holder
Diffuser panel
INSTALLATION OF DIFFUSER AND INLET GRILLE
Depending on the control type, the display holder
will either include both the infrared receiver and
indicator or be empty.
(Refer to the corresponding infrared controller
manual)
The display unit holder is mounted by two screws,
on any side of the diffuser panel.
Check that the position in which the diffuser is mounted is
the right one.
1. - Release the air intake grille.
2. - The diffuser panel can then be provisionally positioned
on the cassette using the fixing clips.
3. - The diffuser is fastened with the four bolts supplied.
4. - Make sure that the frame has not been deformed in the
installation, by an excessive tighten of the bolts. There must
be no recirculation of air between intake and outlet air paths.
The diffuser panel is sealed with insulation to avoid air gaps
between the unit and the air panel. The insulation can be
compressed from 8 mm to 3 mm, allowing the panel to be
tightened to the cassette by up to 5 mm.
MOUNTING THE DIFFUSER PANEL TO THE UNIT
IINSTALLATION OF DISPLAY UNIT HOLDER
MOUNTING THE AIR INTAKE GRILLE AND FILTER ASSEMBLY
The position in which the grill is mounted depends on the position
of the display unit holder.
1.- The grill fixing hooks should be fitted into the holes provided.
2.- The stays need to be placed between the diffuser and the
inlet grille.
3.- The grille is mounted on the diffuser via two hand triggers.
Initially pull off the hand triggers, then insert the grille into the
diffuser and release the hand triggers. When this operation is
completed the grille is attached to the diffuser.
Cassette unit
Air grille and
filter
Diffuser panel
Air grille and
filter

11
WARNING
Electric shock hazard can cause injury or death. Before attempting to
perform any service or maintenance on the unit, turn OFF the electrical
power, and check that the fan has stopped.
A
DETAIL A
HAND TRIGGERS
HOOKS
STAYS
AIR FILTER
AIR INTAKE
GRILLE
TERMINAL PLATE
COVER
ELECTRICAL PANEL
COVER
MAINTENANCE
Access to terminal plate
The terminal plate can be accessed by removing
the air intake grille and unscrewing the terminal
cover.
Access to electrical panel
To gain access to the electrical board follow these
instructions:
1.- Disconnect the display unit, and the swing motor
wire.
(Depending on cassette version.)
2.- Disassemble the diffuser panel by removing the
four screws that attaches it to the unit.
3.- Remove the cover of the electrical panel, where
is the PCB, (Depending on cassette version.)
4.- The PCB can be checked or replaced, by
loosening the screws that hold it.
CLEANING THE AIR FILTER
INSTALL THE FILTER
If the unit operates without the filter, there is
a risk of damaging the unit through dust
contamination.
ACCESS TO ELECTRICAL COMPONENTS
1.- Stop the unit.
2.- Open the air intake grille on the unit.
Open the grille by way of two hand triggers, which are close to the
display unit holder. The grille will swing down supported by the
stays and the hooks.
3.-Relese the air intake grille from de unit.
To release the grille pull it down until the stays can be unlock from
the diffuser, then pull it back to an angle greater of 90º and lift it
lightly, finally the grille hooks will come away from the diffuser.
4.-Remove the air filter once the air intake grille have been
released
Clean the air filter depending on the operation conditions and
working time, (approximately once every 6 months).
Use a vacuum cleaner to clean dust off. If the filter is too dirty,
wash it with water and neutral detergent. Dry the filter before re-
fitting.
5.-Replace the filter in the right position.
6.- Close the air intake grille.
Place the hand triggers on position again.

12
1
2
3
4
WARNING
Electric shock hazard can cause injury or death. Before attempting
to perform any service or maintenance on the unit, turn OFF
the electrical power, and check that the fan has stopped.
2
3
4
1
MAINTENANCE
AIR DISTRIBUTION
1
2
Louvre position for correct air flow in heating
mode.
Louvre position for correct air flow in cooling
mode.
When checking or replacing any internal component of
the unit eg coil, fan motor, condensate pump, float switch,
the drip tray and volute must be removed.
• Remove the air intake grille and filter.
• Disconnect the display unit
• Disassembly the diffuser panel by removing the four
screws that attach it to the unit.
• Detach the volute by removing its three screws, and the
electrical panel cover.
• The drip tray can be taken apart by removing its three
screws. As shown in the figure.
Louvres change position to distribute air according to heating
or cooling operation.
• In cooling operation the louvres are positioned to distribute
air outwards from the discharge, which allow airflow close to
the ceiling.
• In heating mode the louvres are repositioned to blow air in a
downward direction. The air should flow towards to the floor to
prevent layers or stationary hot air forming in the upper part of
the room.
Depending on the control, the louvres may be set on intermediate
positions; as well the louvres may be set to move continuously,
sweep mode. (For more information, see the remote control
manual.)
When the Electro-mechanical thermostat is used the louvres
movement is manual, louvres should be positioned manually.
IMPORTANT:
Do not try to move the louvres, when
they are connected to a motor.
ACCESS TO INTERNAL COMPONENTS
DISASSEMBLING DRIP TRAY
Drip tray
Volute
Coil
Fan motor
Condensate pump
Float switch (in option)
1
2

13
Duct connection O 150mmflange and clip(*)
Duct connection Ø75 mm(*)
Reduction
125-75mm(*)
Duct Ø125mm
(*)Elements included in optional kit
Fan(*)
Insulated flexible
duct Ø150
Air inlet
grille
Air inlet grille and filter
Air intake
OPTIONAL ELECTRIC HEATER TECHNICAL DATA
m /h
3
Air flow supplied to an adjacent room in m /h, fresh air fan at high speed.
3
POWER
230 V 1Ph -50Hz
1,5 kW
• Remove the 150 mm insulation material and cut out the
prepunched side knockouts. The two prepunched side
knockouts must not be used at the same time to provide
conditioned air to an adjacent room.
• Cut away the polystyrene around the inside edge of the opened
panel, remove the polystyrene.
• Use a duct connection flange and a suitable duct.
• Air supply to an adjacent room requires that outlet corresponding
with the duct is closed.
• An air inlet grille must be fitted (if possible near the floor)
between the air conditioned room (where the unit is situated)
and the adjacent room.
• Conduits can be of flexible polyester type or corrugate aluminium,
externally covered with anti-condensate material. The duct
length can be calculated by taking into account the pressure
drop through the unit, using the following table.
• Side knockouts panel are provided. One to connect a fresh air inlet duct, and another to connect an air distribution
duct to deliver air to an adjacent room.
MODELS 020
OPTIONS
AIR SUPPLY TO AN ADJACENT ROOM
FRESH AIR MAKE UP
INSTALLATION
INSTALLATION
• Remove the 68 mm insulation material and cut out the
prepunched side knockouts.
• Secure the duct connection flange to the unit. Conduits can
be of flexible polyester type or corrugate aluminium, externally
covered with anti-condensate material.
• Install a supplementary fresh air fan for the introduction of
fresh air into the unit. The fan motor must be controlled by
an ON-OFF switch.
• Fresh air flow must be less than 10% of the total air flow, to
avoid operating problems. A speed controller should be
installed in the supplementary fan motor, for adjusting the
air flow.
Air flow
CWC 020- CWC 030
175
UNIT/MODELS
Available pressure
100 25
08 15
CWC 040
200 100 25
010 20
CWC 050
250 125 25
020 30
Pa.
2 kW
MODELS 030-040

14
Drain tube from
auxiliary drip tray
Connecting flexible hose
Auxiliary drip tray
Drain tube from drip
tray
Main cable
Air vent
Condensate pump flexible hose
Auxiliary drip tray
Water control valve
NOTE THE CORRECT POSITION OF THE
WATER CONTROL VALVE
• Install the auxiliary drip tray as shown in the illustration.
• Connect the drain tube from drip tray to the auxiliary drip tray.
• The condensate drains from auxiliary drip tray will be pumped away.
OPTIONS
WATER CONTROL VALVE KIT (2 AND 4 WAYS, ON/OFF AND PROPORTIONAL)
AUXILIARY DRIP TRAY
PROBLEM ACTION
FAULT ANALYSIS
1.- Unit not operating
• Check power is available at unit.
• Check wiring.
• Check remote control is functioning and set properly ( if any).
2.- Indoor unit fan running to
fast without apparent speed
change
• Check the indoor unit filter is clean.
• Check wiring
• If problem persists then motor may be faulty.
3.- Condensate overflowing
• Check drip tray for blockage, and condensate drains away.
• Check unit is level.
• Check condensate pump is working.
• Check service drain pipework.
Coupling
Water control valve (4 ways)

15
The air filter cleaning operations do not
require technical service; however when
an electrical or mechanical operation
is required call an Engineer.
WARNING
Electric shock hazard can cause injury
or death. Before attempting to perform
any service or maintenance on the
unit, turn OFF the electrical power,
and check that the fan has stopped.
FILTER CLEANING
Check the air filter and make
sure it is not blocked with dust
or dirt. If the filter is dirty, wash it in a bowl with neutral
soap and water, drying it in the shade before
inserting it in the unit.
Standard Guidelines to Lennox Refac equipment
All technical data contained in these operating instructions including the diagrams and technical description
remains the property of Lennox Refac and may not be used (except for the purpose of familiarising the user
with the equipment), reproduced, photocopied, transferred or transmitted to third parties without prior written
authorisation from Lennox Refac.
The data published in the operating instructions is based on the latest information available. We reserve the
right to make modifications without notice.
We reserve the right to modify our products without notice without obligation to modify previously supplied
goods.
These operating instructions contain useful and important information for the smooth operation and maintenance
of your equipment.
The instructions also include guidelines on how to avoid accidents and serious damage before commissioning
the equipment and during its operation and how to ensure smooth and fault-free operation. Read the operating
instructions carefully before starting the equipment, familiarise yourself with the equipment and handling of
the installation and carefully follow the instructions. It is very important to be properly trained in handling the
equipment. These operating instructions must be kept in a safe place near the equipment.
Like most equipment, the unit requires regular maintenance. This section concerns the maintenance personnel
and management.
If you have any queries or would like to receive further information on any aspect relating to your equipment,
do not hesitate to contact us.
Risk of injury with
rotating objects
Low
temperatures High temperatures Risk of injury with moving objects Electrical voltage
Abrasive
surfaces
POINTS TO KEEP IN MIND

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IRELAND:
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UKRAINE :
OTHER EUROPEAN COUNTRIES,
AFRICA,
MIDDLE-EAST :
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e-mail : marketing lennoxind.com
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JANKA RADOTIN AS
tél. : + 420 2 510 88 111
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LENNOX FRANCE
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LENNOX DEUTSCHLAND Gmbh
tél. : + 49 69 42 0979 0
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LENNOX BENELUX B.V.
tél. : + 31 33 2471 800
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LENNOX POLSKA SP z o.o.
tél. : + 48 22 832 26 61
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LENNOX CLIMATIZAÇAO LDA.
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e-mail : marketing lennoxportugal.com
LENNOX DISTRIBUTION MOSCOW
tél. : + 7 095 246 07 46
fax : + 7 502 933 29 55
e-mail : lennox.dist.moscow co.ru
LENNOX SLOVAKIA
tél. : + 421 7 44 88 92 16
fax : + 421 7 44 88 16 88
LENNOX REFAC S.A.
tél. : + 34 902 400 405
fax : + 34 91 542 84 04
e-mail : marketing lennox-refac.com
LENNOX DISTRIBUTION KIEV
tél. : + 380 44 213 14 21
fax : + 380 44 213 14 21
e-mail : jankauk uct,kiev,ua
LENNOX DISTRIBUTION
tél. : + 33 4 72 23 20 14
fax : + 33 4 72 23 20 28
e-mail :marketing lennoxdist.com