Lennox CWC 090-4P Instruction manual

WATER
CASSETTE
INSTALLATION-OPERATION
&
MAINTENANCE MANUAL

1
CONTENTS
• PRODUCT RANGE
• GENERAL INFORMATION
• SPECIFICATION
• COOLING CAPACITIES
• HEATING CAPACITIES
• WATER PRESSURE DROP
• 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
6
7
8
8
9
10
10-11
12
13
14-15
15
16-17
17
18
TABLE OF CONTENTS
Congratulations, you have made a wise choice with the purchase of your Lennox chilled water ceiling
cassette CWC/CWC-D.
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.
CONTENTS
• PRODUCT RANGE
• GENERAL INFORMATION
• SPECIFICATION
• COOLING CAPACITIES
• HEATING CAPACITIES
• WATER PRESSURE DROP
• 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
6
7
8
8
9
10
10-11
12
13
14-15
15
16-17
17
18
TABLE OF CONTENTS
Congratulations, you have made a wise choice with the purchase of your Lennox chilled water ceiling
cassette CWC/CWC-D.
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
Units 2P : 2 pipes system
Units 4P : 4 pipes system
PRODUCT RANGE
MODEL V / Ph / 50 Hz NOMINAL CAPACITY W
6750 9150
8650
230 V - 1Ph
CWC 070-2P 230 V - 1Ph
230 V - 1Ph
230 V - 1Ph
CWC 090-2P
CWC 070-4P
CWC 090-4P
COOLING HEATING
8450
5800
7050
10600
6450
LENNOX
Cassette unit
Difusser Installation manual Hanging bracket insulation
Screws and washers
Setting up
template
(*)
(*) Packed separately
PRODUCT RANGE
MODEL V / Ph / 50 Hz NOMINAL CAPACITY W
6750 9150
8650
230 V - 1Ph
CWC 070-2P 230 V - 1Ph
230 V - 1Ph
230 V - 1Ph
CWC 090-2P
CWC 070-4P
CWC 090-4P
COOLING HEATING
8450
5800
7050
10600
6450
LENNOX

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,
and filtering the air in the process. Electrical heating elements are available as an
option on all units.
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, two, 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 CIRCUITHEAT INTERCHANGE
INTERNAL COMPONENTS
OPTIONSFAN
AIR DISTRIBUTION
The electrical panel is provided with a terminal block
which provides connection of mains power .
- Electric heater.
- 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.
- Thermostat.
- Float switch.
DIFFUSER PANEL
AIR FILTER
CABINET
ELECTRIC CIRCUITHEAT INTERCHANGE
INTERNAL COMPONENTS
OPTIONSFAN
AIR DISTRIBUTION
The electrical panel is provided with a terminal block
which provides connection of mains power .
- Electric heater.
- 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.
- Thermostat.
- Float switch.
DIFFUSER PANEL
AIR FILTER

4
m /h
3
(1)Inlet air temperature: 27ºC BS / 19ºC BH
Water temperature: 7/12º C
(2)Inlet air temperature: 20ºC BS
Water temperature: 50º C
(3)Inlet air temperature: 20ºC BS
Water temperature: 70/60º C
(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
6750 8450
kPa(1)
W(1)
l
5190 6600
1160 1450
24 28
CWC 070-2P CWC 090-2P
W(1)
l/h(1)
42 54
9150 10600
kPa(2)
1160 1450
24 28
W(2)
l/h(2)
0.18 0.2
A
A(4)
0.8 0.9
4 4
17.4 17.4
W(4)
KW
14930 17300
kPa(3)
1280 1490
28 29
1400 / 1020 1650 / 1200
W(3)
l/h(3)
F 3/4'' GF 3/4'' G
dB(A)(*)
51/4247/41
Kg
298x1175x575
55
Kg
43 45
HxLxW(mm)
HxLxW(mm)
48x1320x720 48x1320x720
298x1175x575
SPECIFICATIONS
UNIT
Total cooling capacity
Sensible cooling capacity
Chilled water flow rate
Water content
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
Hot water flowrate
Hot water pressure drop
Pipe connections
Sound level (Lp)
Diffuser dimensions
Cassette dimensions
Diffuser weight
Cassette weight
Chilled water pressure drop
Hot water pressure drop
Total heating capacity
Total heating capacity
(*)Sound level has been tested at a distance of 2 m from the unit, at standard conditions
6750 8450
kPa(1)
W(1)
l
5190 6600
1160 1450
24 28
CWC 070-2P CWC 090-2P
W(1)
l/h(1)
42 54
9150 10600
kPa(2)
1160 1450
24 28
W(2)
l/h(2)
0.18 0.2
A
A(4)
0.8 0.9
4 4
17.4 17.4
W(4)
KW
14930 17300
kPa(3)
1280 1490
28 29
1400 / 1020 1650 / 1200
W(3)
l/h(3)
F 3/4'' GF 3/4'' G
dB(A)(*)
51/4247/41
Kg
298x1175x575
55
Kg
43 45
HxLxW(mm)
HxLxW(mm)
48x1320x720 48x1320x720
298x1175x575
SPECIFICATIONS
UNIT
Total cooling capacity
Sensible cooling capacity
Chilled water flow rate
Water content
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
Hot water flowrate
Hot water pressure drop
Pipe connections
Sound level (Lp)
Diffuser dimensions
Cassette dimensions
Diffuser weight
Cassette weight
Chilled water pressure drop
Hot water pressure drop
Total heating capacity
Total heating capacity

5
m /h
3
(1)Inlet air temperature: 27ºC BS / 19ºC BH
Water temperature: 7/12º C
(2)Inlet air temperature: 20ºC BS
Water temperature: 70/60º C
(3)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
5800 7050
kPa(1)
W(1)
l
4350 5270
1000 1210
11 25
CWC 070-4PCWC 090-4P
W(1)
l/h(1)
42 54
6450 8650
kPa(2)
555 745
24 17
W(2)
l/h(2)
0.18 0.2
A
A(3)
0.8 0.9
4 4
17.4 17.4
W(3)
KW
1400 / 1020 1650 / 1200
dB(A)(*)
51/4247/41
Kg
298x1175x575
55
Kg
43 45
HxLxW(mm)
HxLxW(mm)
48x1320x720 48x1320x720
298x1175x575
Cold water F 3/4'' G
Hot water F 1/2'' G
SPECIFICATIONS
UNIT
Total cooling capacity
Sensible cooling 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
4 PIPES SYSTEM
Pipe connections
Sound level (Lp)
Diffuser dimensions
Cassette dimensions
Diffuser weight
Cassette weight
Chilled water pressure drop
Hot water pressure drop
5800 7050
kPa(1)
W(1)
l
4350 5270
1000 1210
11 25
CWC 070-4PCWC 090-4P
W(1)
l/h(1)
42 54
6450 8650
kPa(2)
555 745
24 17
W(2)
l/h(2)
0.18 0.2
A
A(3)
0.8 0.9
4 4
17.4 17.4
W(3)
KW
1400 / 1020 1650 / 1200
dB(A)(*)
51/4247/41
Kg
298x1175x575
55
Kg
43 45
HxLxW(mm)
HxLxW(mm)
48x1320x720 48x1320x720
298x1175x575
Cold water F 3/4'' G
Hot water F 1/2'' G
SPECIFICATIONS
UNIT
Total cooling capacity
Sensible cooling 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
4 PIPES SYSTEM
Pipe connections
Sound level (Lp)
Diffuser dimensions
Cassette dimensions
Diffuser weight
Cassette weight
Chilled water pressure drop
Hot water pressure drop

6
CORRECTION FACTORS
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:
Total cooling capacity W
Sensible cooling capacity W
Room air temperature
with DB ºC
Room air temperature
with WB ºC
Low
speed Medium
speed
Cooling
Capacity
Water inlet temperature ºC
T water ºC
COOLING CAPACITIES
3
4
9 8 7 6 5
10
4
98765 10
11
12 13
3000
22
21
20
19
1817161514
22
21
20
19
18
25
24
23
28 27 26 30 29
4000 5000 6000 7000 8000 9000
4000 5000 6000 7000 8000 9000 10000 11000 12000
070-2P
070-4P
090-4P
090-2P
070-4P
070-2P
090-4P
090-2P
EXAMPLE: For the unit CWC 090-2P with chilled water rise of T = 5
ºC, chilled water temperature 7 ºC and entering air temperature 27
ºC DB/19 ºC WB, according to the diagram the cooling capacity is:
Total cooling capacity = 8450 W
Sensible cooling capacity= 6600 W
To estimate the water flow use the formula Qw=Pt x 0.86
Qw = Water flow (l/h) T
Pt = Total cooling capacity (W)
T = Inlet water temperature - outlet water temperature (ºC)
For the example given Qw =1453 l/h and water pressure drop in page
8 is 28 Kpa.
DB : Dry bulb
WB : Wet bulb
0,8 0,9
COOLING CAPACITIES
3
4
9 8 7 6 5
10
4
98765 10
11
12 13
3000
22
21
20
19
1817161514
22
21
20
19
18
25
24
23
28 27 26 30 29
4000 5000 6000 7000 8000 9000
4000 5000 6000 7000 8000 9000 10000 11000 12000
070-2P
070-4P
090-4P
090-2P
070-4P
070-2P
090-4P
090-2P
EXAMPLE: For the unit CWC 090-2P with chilled water rise of T = 5
ºC, chilled water temperature 7 ºC and entering air temperature 27
ºC DB/19 ºC WB, according to the diagram the cooling capacity is:
Total cooling capacity = 8450 W
Sensible cooling capacity= 6600 W
To estimate the water flow use the formula Qw=Pt x 0.86
Qw = Water flow (l/h) T
Pt = Total cooling capacity (W)
T = Inlet water temperature - outlet water temperature (ºC)
For the example given Qw =1453 l/h and water pressure drop in page
8 is 28 Kpa.
DB : Dry bulb
WB : Wet bulb

7
50
200 800 1600
50403020 60 70
070-4P
070-2P
090-4P
090-2P
40 30 20 10
400 600 1000 1200 1400
5
10
15
20
25
Water pressure drops (Kpa)
(Hot water coil)
Entering water temperature ºC - entering air temperature ºC
Heating capacity (Kw) 1800 2000
070-4P
070-2P
090-4P
090-2P
Water flow (l/h)
Low speed Medium
speed
Cooling
Capacity
80
CORRECTION FACTORS
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:
HEATING CAPACITY
EXAMPLE: For the unit CWC 090-2P, with entering water temperature - entering air temperature equal to 50 ºC
and water flow 1490 l/h in the diagram we get:
Total heating capacity = 17300 W
Water pressure drops = 29 KPa
(high speed fan)
0,77 0,85
HEATING CAPACITY
EXAMPLE: For the unit CWC 090-2P, with entering water temperature - entering air temperature equal to 50 ºC
and water flow 1490 l/h in the diagram we get:
Total heating capacity = 17300 W
Water pressure drops = 29 KPa
(high speed fan)

8
2
3 X 1,5mm
2
3 X 1,5mm
2
7 X 1,5mm 2
8 X 1,5mm
2
3 X 1,5mm
2
7 X 1,5mm
1 1
22
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.
2 PIPES SYSTEM 4 PIPES SYSTEM
WATER PRESSURE DROP
Ethylene glycol % Pressure drop
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.
MODEL VOLTAGE
50Hz
CWC070-2P /
CWC090-2P
CWC070-4P /
CWC090-4P
230 V / 1Ph
230 V / 1Ph ---- ----
COOL WATER COOL AND HOT WATER
Nº OF WIRES X SECTION
ELECTRICAL CONNECTIONS
10% x 1,07
20% x 1,12
30% x 1,20
5 7 81 2 3
0 1 2 3 42 51 2
230V/50HZ 1Ph + N
4 6
6 7 8
5 7 81 2 3
0 1 2 3 42 51 2
230V/50HZ 1Ph + N
4 6
6 7 8
THERMOSTAT
RC-311-X2
CASSETTE UNIT
Power supply
Thermostat connections
1
1
2
2
CHILLED WATER
CWC 070-4P / CWC 090-4P
CWC 070-2P / CWC 090-2P
CHILLED WATER AND HOT WATER
CWC 070-2P / CWC 090-2P
PRESSURE DROP Kpa
CWC 070-2P CWC 090-2P
800
1100
1000
1200
1300
900
1400
1600
1700
1800
1500
1900
14
16
19
22
19
22
FLOW
RATE
l/h
2000
25
28
32
35
38
---
---
---
---
25
29
31
35
38
42
46
9
11
14
16
1160 24 18
1450 33 28
CWC 070-4P CWC 090-4P CWC 090-4PCWC 070-4P
400
900
500
1000
1200
700
600
800
24
27
COOL WATER HOT WATER
7
9
11
21
15
16
18
PRESSURE DROP Kpa
1100
1300
1400
1500
1600
35
38
14
16
19
32
22
25
28
35
43
53
14
20
27
15
19
24
29
11
34
40
46
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
FLOW
RATE
l/h
555 24--- --- ---
745 --- --- 41 17
1210 16 25 40---
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.
MODEL VOLTAGE
50Hz
CWC070-2P /
CWC090-2P
CWC070-4P /
CWC090-4P
230 V / 1Ph
230 V / 1Ph ---- ----
COOL WATER COOL AND HOT WATER
Nº OF WIRES X SECTION
ELECTRICAL CONNECTIONS
10% x 1,07
20% x 1,12
30% x 1,20
5 7 81 2 3
0 1 2 3 42 51 2
230V/50HZ 1Ph + N
4 6
6 7 8
5 7 81 2 3
0 1 2 3 42 51 2
230V/50HZ 1Ph + N
4 6
6 7 8
THERMOSTAT
RC-311-X2
CASSETTE UNIT
Power supply
Thermostat connections
1
1
2
2
CHILLED WATER
CWC 070-4P / CWC 090-4P
CWC 070-2P / CWC 090-2P
CHILLED WATER AND HOT WATER
CWC 070-2P / CWC 090-2P
PRESSURE DROP Kpa
CWC 070-2P CWC 090-2P
800
1100
1000
1200
1300
900
1400
1600
1700
1800
1500
1900
14
16
19
22
19
22
FLOW
RATE
l/h
2000
25
28
32
35
38
---
---
---
---
25
29
31
35
38
42
46
9
11
14
16
1160 24 18
1450 33 28
CWC 070-4P CWC 090-4P CWC 090-4PCWC 070-4P
400
900
500
1000
1200
700
600
800
24
27
COOL WATER HOT WATER
7
9
11
21
15
16
18
PRESSURE DROP Kpa
1100
1300
1400
1500
1600
35
38
14
16
19
32
22
25
28
35
43
53
14
20
27
15
19
24
29
11
34
40
46
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
---
FLOW
RATE
l/h
555 24--- --- ---
745 --- --- 41 17
1210 16 25 40---

9
Inlet cool water
connection 3/4''G
30
90
Inlet hot water
connection 1/2''G
Outlet cool water connection 3/4''G
Outlet hot water connection 1/2''G
4 PIPES SYSTEM
2 PIPES SYSTEM
575
196
273
Fresh air knockout panel for
branch duct
CASSETTE UNIT
DIFFUSER PANEL
298
37
152
197
Outlet cool water connection 3/4''G
Inlet cool water connection 3/4''G
75
63
24
Drain tube
16 mm O.D.
Condensate pump
flexible hose 10 mm
I.D. 15 mm O.D.
Electrical cable entry point
Branch duct knockout hole, to supply
air into adjacent area
4x Hanging brackets
123
284,8
O 150
251
1140
17,5
29,5 51,9
493,6
527 121 527
1320
720
Auxiliary electrical board Main electrical
board
17,5
UNIT DIMENSIONS (mm.)
143
46,5
O 68