Lennox 20 Instruction manual

CHILLED

WATER

CASSETTE

INSTALLATION-OPERATION

MAINTENANCE MANUAL

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

4-5

7-8

11-12

13-14

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.

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

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

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

(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

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

CWC 050

2000 3500

kPa(1)

W(1)

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

2800 4400

kPa(2)

5100

345 600 745

11 17 26

W(2)

l/h(2)

9446 46 69

0,5

----

A(4)

0,2 0,2 0,3

1,5 2 2

6,5 8,7 8,7

W(4)

9600

825

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

298x575x575

3 3 3

21 22 23

HxLxW(mm)

48x720x720 48x720x720 48x720x720 48x720x720

298x575x575 298x575x575 298x575x575

0,8

0,68

0,77

0,9

0,85

0,86

Chilled water pressure drop

Hot water pressure drop

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

8,3

13,6

17 9,8

17 17,8

19 20,5

21 23 14

24 26 16

29,5 17,5

33 19.5

36,3 22

26----

----

---- ----

--------

----

5 7 81 2 3

0 1 2 3 42 51 2

230V/50HZ 1Ph + N

4 6

6 7 8

THERMOSTAT

CASSETTE UNIT

CHILLED WATER CHILLED WATER AND HOT WATER

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.

3 X 1,5mm 2

3 X 1,5mm

7 X 1,5mm 2

8 X 1,5mm

23,5

121

247

32 72

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

720

489,74

540

720

DETAIL A

30,6 54,66

17,5

489,74

54,66 30,6

(**) INSTALLATION CLEARANCES

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

• 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

Min. 500 (**)

Cassette

unit

Diffuser panel

308

Setting up

template

489,74

54,66

30,6

575

30,6

54,66

540

17,5 17,5

575

Cassette

unit

Diffuser panel

Suspension rots M-8

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.

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

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)

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