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