Lennox FWCK, FWHK Installation, Operating And Maintenance Manual

Providing indoor climate comfort

FWCK/FWHK

Application guide
Installation, operating and
maintenance manual

MIL101E-0105 12-2009
Original manual translation

1

Congratulations you have made a wise choice. 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.

WARNING: Read this manual before installation, reparation o maintenance works.

• PRODUCT RANGE

• GENERAL DESCRIPTION

• PHYSICAL DATA

• ELECTRICAL SPECIFICATIONS

• ELECTRICAL CONNECTIONS

• OPERATING LIMITS

• FAN SPECIFICATIONS

• CAPACITY TABLES

• CORRECTION FACTORS

• DIMENSIONS

• INSTALLATION

• SERVICE AND MAINTENANCE

• OPTIONS

• POINTS TO KEEP IN MIND

• NOTES

1
2
3
3
4
4
5

6-8

9

10
11-12
13-14
15-16

17

18

INDEX

PRODUCT RANGE

COOLING ONLY UNITS

HEAT PUMP UNITS

400 V - 3Ph

MODEL V / Ph / 50 Hz

NOMINAL CAPACITY kW

10,2

13

2,73

3,47

400 V - 3Ph
230 V - 3Ph

400 V - 3Ph

NOMINAL POWER INPUT kW

230 V - 1Ph

230 V - 1Ph

7,3

1,93

230 V - 3Ph

230 V - 1Ph 8,4

2,38

230 V - 1Ph 5,7

1,5

14,9

4,28

230 V - 3Ph
400 V - 3Ph
230 V - 3Ph

20,1

5,91

4

1,12

COOLING

COOLING

FWCK 04
FWCK 06

FWCK 07
FWCK 08

FWCK 10

FWCK 12

FWCK 16
FWCK 22

230 V - 1Ph

400 V - 3Ph

MODEL V / Ph / 50 Hz

NOMINAL CAPACITY kW

400 V - 3Ph
230 V - 3Ph

400 V - 3Ph

NOMINAL POWER INPUT kW

230 V - 1Ph

230 V - 1Ph
230 V - 3Ph

230 V - 1Ph

230 V - 1Ph

230 V - 3Ph
400 V - 3Ph
230 V - 3Ph
400 V - 3Ph

3,15

3,92

2,22
2,75

1,72

4,83

6,65

12,3

15

8,6

10,4

7

18,5

24,5

5,7

1,42

COOLING

HEATING

COOLING

HEATING

FWHK 04
FWHK 06

FWHK 07
FWHK 08

FWHK 10

FWHK 12

FWHK 16
FWHK 22

230 V - 1Ph

10,2

13

7,3
8,4

5,7

14,9

20,1

4

2,73

3,47

1,93
2,38

1,5

4,28

5,91

1,12

CONTENTS PAGE

Lennox have been providing environmental solutions since 1895, our range of FWCK/FWHK continues to meet the standards that have made
LENNOX a household name. Flexible design solutions to meet YOUR needs and uncompromising attention to detail. Engineered to last, simple
to maintain and Quality that comes as standard. Information on local contacts at www.lennoxeurope.com.

All the technical and technological information contained in this manual, including any drawing and technical descriptions provided by us, remain
the property of Lennox and must not be utilised (except in the operation of this product), reproduced, issued to or made available to third parties
without the prior written agreement of Lennox.

ON / OFF

SET TEMP

HOLD

SWING

DAY

ON TIMER

CLOCK

SLEEP

FAN

OFF TIMER

HOUR MINUTE

MODE

SET CLOCK

MON TUE WED THU FRI SAT SUN

KEYLOCK

TIMER ACTIVE SET TIMER

AUTO

HEAT

HEAT
TEMP.
ROOM
TEMP.

AUTO
COOL
TEMP.

DRY

COOL

SLEEP

SWING

FAN

• Electrical heater mounted on fan discharge.

• Hot water coil (for cooling only units).

• Pressostatic valve regulating water flow for cooling only
models.

• Flow switch.

• Water filter.

• Main switch (not available for 04-06-07 models).

• Compressor acoustic jacket.

•

Three phase protection (three phase units).

GENERAL DESCRIPTION

COMPRESSOR

WATER EXCHANGER

WATER CIRCUIT

COOLING/HEATING CIRCUIT

ELECTRIC CIRCUIT

AIR EXCHANGER

CABINET

FAN

OPTIONS

Made of welded dehumidifying copper tube with access
connections.

Cooling only units (FWCK):
They include dehydrator filter, liquid recipient, and
expansion system, high pressure switch for all models
and low pressure switch for modes 08-10-12-16-22.
Heat pump units (FWHK):
They include thermostatic valve as expansion system,
high and low pressure switches for all models. In addition
they includes a security thermostat for low warter
temperatures, 4 ways valve and liquid recipient.
To work properly in heating mode, the unit includes check
valve, restrictor and filter drier.

The unit leaves the factory with R407C refrigerant.

The electrical box includes all the components and terminal
blocks needed for the installation. It includes a printed
board, starting timer and reversible working mode in heat
pump units. In addition alarm, ON/OFF remote and dry
contact for water pump are available too.
The wired remote control manages the unit.

REMOTE CONTROL

2

The air conditioner, horizontal compact, water condensed type FWCK/FWHK, are specially designed for small and average
installation, office, house, etc.
On standard version the unit cleans, filters, cools and dehumidifies the air (FWCK), and in addition heats if it is heat pump unit
(FWHK). You are able to incorporate option elements such as electrical heater or hot water coil.

The unit includes an exchanger plate, compact and resistant
made on stainless steel, specially selected for this type of
unit.

The cabinet is made of galvanised steel with compact
dimensions and features allow the unit to be positioned in
almost any location.
Internally the unit incorporates thermal acoustic insulation
to reduce sound level.

Made of copper tubing with aluminum swirl fins, they are
designed and specially dimensioned to obtain the maximum
output.

The units include a centrifugal three speed motor fan, with
a motor directly fitted (except FWCK/FWHK 22 with belts­pulley), with high performance on air flow.

It includes water threaded connections H-G.
Heat pump units include a differential water switch in order
to stop the unit without water flow.

Rotary compressor for 04 model and Scroll for the rest of
the models, all of them with internal thermic protection. It
is mounted on vibration-absorbent blocks both on the inside
and outside, statically and dynamically balanced.

AIR FILTER

A polypropylene washable air filter is incorporated in the
unit it is accessible for maintenance operations.

The unit includes a wired remote control with LCD display.

OLT-1X Controller

Basic characteristics for the controller:

- 3 fan speeds (High/Medium/Low).

- Different modes of working: Cool, Heat, Auto, Fan and
Dry.

- Sleep mode.

- 7 days programmable timers.

- Real time clock

- Keyblock function

- Alarms display

- Temperature indication ºC ó ºF.

3

MAXIMUM ABSORBED POWER

ELECTRICAL SPECIFICATIONS

kW.

Compressor
Indoor fan

MAXIMUM RUNNING CURRENT

TOTAL

kW.

kW.

2,3

0,33
2,63

2,9

0,33
3,23

3,4

0,46
3,86

4,05
0,46

4,51

4,70

0,83

5,53

5,78
0,83

6,61

A

VOLTAGE

7,60
1,10

8,70

Maximum running current

13,0 16,4 19,5

18,9/9,4

23,3/12,7

23,9/15,5

26,8/16,5

20,8

A

48,6

62,6 78,2

93,2/48,2 102,0/54,0 137,0/70,0 180,5/103,5

97,2

Starting current

PHYSICAL DATA

MODEL

Total cooling capacity

Nominal absorbed power
Cooling

kW (**)

kW (*)

Air flow (max./min.)

20,1
24,5

210

13
15

14,9
18,5

10,2
12,3

8,4

10,4

2350/1000

7,3
8,6

1400/800

5,7

7

FWCK 06
FWHK 06

1550/600

3618

72

168/171

---/56,5

2250/1200 3100/1500 3100/1800 4500/2250

1" G

FWCK 08
FWHK 08

FWCK 10
FWHK 10

FWCK 12
FWHK 12

FWCK 16
FWHK 16

FWCK 22
FWHK 22

FWCK 07
FWHK 07

4

5,7

FWCK 04
FWHK 04

1050/450

Nominal water flow

Water pressure drop

Hydraulic connections

Sound pressure

level (LP) (2)

dB(A)

Dimensions

l/h

kPa

Cooling

(low / high) speed

(mm)

Height
Width

Depth

(mm)
(mm)

Pa

Max. available static pressure(1)

Net weight

Kg

120 120100120100140

2340 26641829150513071019

75 3545836135

147/150

155/158

104/106

101/103

78/80

75/77

47/50 46/4949/5051/5244/4542/49

3/4" G 3/4" G 3/4" G 3/4" G 1" G 1" G

80

713

16

54/56
44/47

440
492

792

3/4" G

Total heating capacity

Nominal absorbed power
Heating

5,91
6,65

3,47
3,92

4,28
4,83

2,73
3,15

2,38
2,75

1,93
2,22

1,5

1,72

1,12
1,42

kW (**)

kW (*)

440
492

792

465
623

1083

505
703

1503

465
623

1083

505
703

1503

505
703

1503

1,4

0,19
1,59

9,7

29,9

FWCK 06
FWHK 06

FWCK 08
FWHK 08

FWCK 10
FWHK 10

FWCK 12
FWHK 12

FWCK 16
FWHK 16

FWCK 22
FWHK 22

FWCK 07
FWHK 07

FWCK 04
FWHK 04

440
492

792

44/47

47/49

51/52

47/50

50/50

46/49

---/56,544/45

Heating

(low / high) speed

Cooling / heating

230V /1Ph

230V / 400V 3Ph

m /h

3

(*) Exchanger air inlet temperature: 27ºC DB / 19ºC WB.
Exchanger water inlet temperature: 30ºC.
(**) Exchanger air inlet temperature: 20ºC DB.
Exchanger water inlet temperature: 20ºC.
(1) With admissible minimum air flow.
(2) Sound pressure level has been tested at a distance of 2 m from the unit, with duct in aspiration and air discharge, normal absorption in

accordance with room size and unit capacity.

DB.- Dry bulb temperature
WB.- Wet bulb temperature

4

Power supply
Thermostat connection
Electrical heater power supply
Connection Electrical heater - control.

2

2
2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2

2
2
2

Electrical heater

ON / OFF

SET TEMP

HOLD

SWING

DAY

ON TIMER

CLOCK

SLEEP

FAN

OFF TIMER

HOUR MINUTE

MODE

SET CLOCK

MON TUE WED THU FRI SAT SUN

KEYLOCK

TIMER ACTIVESET TIMER

AUTO

HEAT

HEAT
TEMP.
ROOM
TEMP.

AUTO
COOL
TEMP.

DRY

COOL

SLEEP
SWING

FAN

(supplied with

the unit)

Length 15m.

4x1mm

2

23

3x1mm

2

ELECTRICAL CONNECTIONS:
Power supply, remote ON/OFF, alarm and
dry contact for water pump.

NOTE: Remote ON/OFF and dry contact for water
pump. Can support 3A for AC3.

ELECTRICAL CONNECTIONS

FOR ELECTRICAL CONNECTION REFER TO WIRING DIAGRAM IN THE

UNIT.

PLEASE, CHECK ELECTRICAL DATA IN ORDER TO SELECT THE

FUSES.

Nº OF WIRES X SECTION

3 X6mm

4 X 6mm
4 X 4mm

4 X 4mm

4 X 6mm

3 X 6mm
4 X 4mm

4 X 2,5mm

1

3 X 4mm

4 X 4mm

5 X 2,5mm

5 X 4mm

4 X 6mm

3 X 4mm
4 X 4mm

5 X 2,5mm

MODEL

FWCK/FWHK 08

FWCK/FWHK

10

FWCK/FWHK

12-16

FWCK/FWHK

22

VOLTAGE

50Hz

230 V / 1Ph
230 V / 1Ph

230 V / 3Ph
400 V / 3Ph
230 V / 3Ph
400 V / 3Ph
230 V / 3Ph

400 V / 3Ph

FWCK/FWHK 04
FWCK/FWHK 06

FWCK/FWHK 07

230 V / 1Ph

230 V / 1Ph

230 V / 1Ph 3 X 2,5mm

3 X 2,5mm
3 X 2,5mm

3 X 2,5mm

3 X 4mm
3 X 4mm

OPERATING LIMITS

WB.- Wet bulb temperature
DB.- Dry bulb temperature

Water inlet temperature

Air inlet temperature into indoor section D.B/W.B

Air inlet temperature into indoor section D.B/W.B

Water inlet temperature

HEATING MODE

(*)

(*)

Up to 35

ºC mimimum or more than minimum water flo

w can be used.

Between 35

ºC and 43ºC nominal or more than nominal water flow can be used.

It is not possible to use minimum water flow for that range of temperatures.

43ºC

1N~230V-50Hz+PE

PE L N 1 2 19 20

ON/OFF

Flow

switch

Dry contact for

water pump

Alarm

12 13

PE

1 2 19 20

ON/OFF

Flow

switch

Dry contact for

water pump

Alarm

12 13

3~230V-50Hz+PE

L1 L2 L3

PE

1 2 19 20

ON/OFF

Flow

switch

Dry contact for

water pump

Alarm

12 13

3N~400V-50Hz+PE

L1 L2 L3 N

INSTALLATION GUIDE FOR CONTROL CABLE (TO AVOID INTERFERENCES):

• Use the screened 15 m cable supplied with terminal (3 wires + screen).

• Wire the cable separated from electrical power wiring by a physical distance of 500 mm.

• Wire the cable separated from halogen lamps/fluorescent tube lighting... by a phyisical distance of 500 mm.

• Wire the cable separated from radio frequency sources such as radio transmitter... at least 500 mm.
NEVER WIND THE REMAINING CABLE AROUND, CUT THE CABLE BY THE TERMINAL END.

Local and national legislation has to be taken into account when the unit will be installed.

1

2

3

4

4

4

1
2

3

COOLING MODE

15ºC

35ºC

21ºC/15ºC 32ºC/23ºC

12ºC

30ºC

17ºC

24°C

5

FANS SPECIFICATIONS

Unit leaves the factory with pulley opened (1-1/2 V) turn.

FWCK/FWHK 22

120

3300

150

3000

180

2750

210

2500

0

4500304200603900903600

3750 3400

4060 3750 3450 3200 2900 2650 2300 ---

2250 --- ---

3100 2800 2550

HIGH SPEED
MEDIUM SPEED
LOW SPEED

HIGH SPEED
MEDIUM SPEED
LOW SPEED

HIGH SPEED
MEDIUM SPEED
LOW SPEED

HIGH SPEED
MEDIUM SPEED
LOW SPEED

HIGH SPEED
MEDIUM SPEED
LOW SPEED

HIGH SPEED
MEDIUM SPEED
LOW SPEED

HIGH SPEED
MEDIUM SPEED
LOW SPEED

Unit leaves the factory with three speeds connected.

Cooling only units leave the factory with three speeds connected. Heat pump units leave the factory with HIGH and MEDIUM speeds connected.

Unit leaves the factory with HIGH and MEDIUM speeds connected (the unit can not work in LOW speed).

Cooling only units leave the factory with three speeds connected. Heat pump units leave the factory with HIGH and MEDIUM speeds connected.

Unit leaves the factory with HIGH and MEDIUM speeds connected.

Unit leaves the factory with HIGH and MEDIUM speeds connected.

Unit leaves the factory with three speeds connected.

m /h

3

AVAILABLE STATIC PRESSURE Pa.

80

1700

100

1350

120

1000

140

---

0

2350202200402050601900

1860 1840 1750 1650

2200 2075 1950 1800

FWCK/FWHK 08

1550 1250 --- --­1375 1050 --- ---

AVAILABLE STATIC PRESSURE

Pa.

80

1500

100

1220

120

---

140

---

0

2250202150402000601800

1850 1820 1700

1525

2100 2000

1875

1675

FWCK/FWHK 10

1400 ---

---

---

1260 ---

---

---

AVAILABLE STATIC PRESSURE Pa.

80

2250

100

2050

120

1800

140

---

0

3100202850402650602450

1900 1800 1700 1600

2450 2300 2150 1975

FWCK/FWHK 12

1800 1600 --- --­1500 --- --- ---

3

m /h

3

m /h

3

m /h

3

m /h

3

m /h

3

3

AVAILABLE STATIC PRESSURE Pa.

AVAILABLE STATIC PRESSURE Pa.

AIR FLOW

AVAILABLE STATIC PRESSURE Pa.

AIR FLOW

AIR FLOW

AIR FLOW

AIR FLOW

AIR FLOW

AIR FLOW

AIR FLOW

80

950

100
800

120

---

140

---

0

1400201300401150601075

---

1100 1050 1000 925

FWCK/FWHK 07

800 --- --- ---

--- --- ------ --- ------

80

2250

100

2050

120

1800

140

---

0

3100202850402650602450

1900 1800

2450 2300 2150 1975

FWCK/FWHK 16

1800 --- --- ---

--- --- ---

--- --- ---

FWCK/FWHK 04

80

1150

100

1000

120
800

140
600

0

1550201450401350601250

675 660 650 640

1175 1160 1140 1050

FWCK/FWHK 06

950 790 600 --­625 --- --- ---

80

500

1000

1050209504085060700

750 700 600 500

950 850 750 650 450

---

---

---

---

COOLING AND HEATING CAPACITIES

FWCK/FWHK 04 -Nominal air flow 750 m3/h

FWCK/FWHK 06-Nominal air flow 1100 m3/h

FWCK/FWHK 07-Nominal air flow 1200 m3/h

6

Nominal capacity conditions: Exchanger air inlet temperature: 27ºC DB/19ºC WB for cooling y 20ºC WB for heating mode.
For another working conditions use correction factor tables.

5,04
5,13
5,24
5,21
5,30
5,39
5,61
5,70
5,79
5,95
6,05
6,17
6,20
6,30
6,42

-----

-----

-----

-----

-----

-----

-----

-----

----­570
713
855
570
713
855
570
713
855
570
713
855
570
713
855

----­713
855

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

-----

-----

----­10
16
24
10
16
24
10
16
24
10
16
24
10
16
24

----­16
24

-----

-----

----­4,92
4,95
4,97
4,68
4,70
4,73
4,35
4,37
4,40
3,97
4,00
4,03
3,60
3,63
3,65

----­3,30
3,32

-----

-----

----­3,31
3,31
3,33
3,24
3,26
3,27
3,13
3,14
3,15
3,02
3,03
3,04
2,91
2,92
2,93

----­2,79
2,79

-----

-----

----­0,92
0,90
0,89
0,99
0,98
0,96
1,07
1,05
1,03
1,15
1,12
1,10
1,22
1,19
1,17

----­1,27
1,24

1,34
1,36
1,37
1,36
1,37
1,39
1,41
1,42
1,44
1,44
1,46
1,48
1,47
1,48
1,50

-----

-----

-----

-----

-----

-----

Water inlet

temperature ºC

Water flow

l/h

Water pressure

drop

kPa

COOLING CAPACITY FWCK/FWHK HEATING CAPACITY FWHK

Total capacity

kW

Sensible capacity

kW

Total power input

kW

Total capacity

kW

Total power input

kW

12°C

15ºC

20ºC

25ºC

30ºC

35ºC

40ºC

6,18
6,30
6,43
6,40
6,51
6,62
6,89
7,00
7,11
7,31
7,43
7,57
7,62
7,74
7,88

-----

-----

-----

-----

-----

-----

-----

-----

-----

815
1019
1223

815
1019
1223

815
1019
1223

815
1019
1223

815
1019
1223

----­1019
1223

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

-----

-----

----­21
35
53
21
35
53
21
35
53
21
35
53
21
35
53

----­35
53

-----

-----

----­7,02
7,05
7,09
6,66
6,70
6,73
6,19
6,23
6,26
5,66
5,70
5,74
5,14
5,17
5,21

----­4,70
4,74

-----

-----

----­4,73
4,73
4,76
4,64
4,65
4,67
4,48
4,49
4,51
4,31
4,33
4,35
4,15
4,17
4,18

----­3,98
3,99

-----

-----

----­1,23
1,21
1,19
1,33
1,31
1,28
1,44
1,40
1,37
1,54
1,50
1,47
1,63
1,60
1,56

----­1,70
1,66

1,62
1,64
1,66
1,65
1,66
1,68
1,70
1,72
1,74
1,75
1,76
1,79
1,78
1,79
1,82

-----

-----

-----

-----

-----

-----

Water inlet

temperature ºC

Water flow

l/h

Water pressure

drop
kPa

COOLING CAPACITY FWCK/FWHK HEATING CAPACITY FWHK

Total capacity

kW

Sensible capacity

kW

Total power input

kW

Total capacity

kW

Total power input

kW

12°C

15ºC

20ºC

25ºC

30ºC

35ºC

40ºC

7,60
7,74
7,90
7,86
8,00
8,13
8,46
8,60
8,74
8,98
9,13
9,30
9,36
9,51
9,68

-----

-----

-----

-----

-----

-----

-----

-----

----­1045
1307
1568
1045
1307
1568
1045
1307
1568
1045
1307
1568
1045
1307
1568

----­1307
1568

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

-----

-----

----­37
61
91
37
61
91
37
61
91
37
61
91
37
61
91

----­61
91

-----

-----

----­8,98
9,03
9,08
8,53
8,58
8,62
7,93
7,98
8,02
7,25
7,30
7,35
6,58
6,62
6,67

----­6,02
6,07

-----

-----

----­5,87
5,88
5,91
5,76
5,78
5,80
5,56
5,58
5,60
5,36
5,38
5,40
5,16
5,18
5,20

----­4,95
4,95

-----

-----

----­1,58
1,56
1,53
1,71
1,68
1,65
1,85
1,81
1,77
1,98
1,93
1,89
2,10
2,05
2,01

----­2,19
2,14

2,10
2,12
2,15
2,13
2,15
2,17
2,20
2,22
2,25
2,25
2,28
2,31
2,29
2,32
2,35

-----

-----

-----

-----

-----

-----

Water inlet

temperature ºC

Water flow

l/h

Water pressure

drop
kPa

COOLING CAPACITY FWCK/FWHK HEATING CAPACITY FWHK

Total capacity

kW

Sensible capacity

kW

Total power input

kW

Total capacity

kW

Total power input

kW

12°C

15ºC

20ºC

25ºC

30ºC

35ºC

40ºC

DB.- Dry bulb.
WB.- Wet bulb.

7

FWCK/FWHK 08 -Nominal air flow 1900 m3/h

FWCK/FWHK 10 -Nominal air flow 2000 m3/h

FWCK/FWHK 12 -Nominal air flow 2500 m3/h

Nominal capacity conditions: Exchanger air inlet temperature:: 27ºC DB/19ºC WB for cooling y 20ºC WB for heating mode.
For another working conditions use correction factor tables.

9,19
9,36
9,55
9,50
9,67

9,84
10,23
10,40
10,57
10,86
11,04
11,25
11,32
11,49
11,71

-----

-----

-----

-----

-----

-----

-----

-----

----­1204
1505
1806
1204
1505
1806
1204
1505
1806
1204
1505
1806
1204
1505
1806

----­1505
1806

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

-----

-----

----­51
83

124

51
83

124

51
83

124

51
83

124

51
83

124

----­83

124

-----

-----

----­10,34
10,39
10,44

9,82
9,87
9,92
9,13
9,18
9,23
8,35
8,40
8,45
7,57
7,62
7,67

-----

6,93
6,98

-----

-----

----­7,17
7,18
7,22
7,03
7,06
7,08
6,79
6,81
6,84
6,55
6,57
6,59
6,30
6,33
6,35

----­6,04
6,05

-----

-----

----­1,95
1,92
1,88
2,11
2,07
2,03
2,28
2,23
2,18
2,44
2,38
2,33
2,59
2,53
2,48

----­2,70
2,64

2,60
2,63
2,66
2,64
2,66
2,68
2,72
2,75
2,78
2,79
2,82
2,86
2,84
2,87
2,91

-----

-----

-----

-----

-----

-----

Water inlet

temperature ºC

Water flow

l/h

Water pressure

drop
kPa

COOLING CAPACITY FWCK/FWHK HEATING CAPACITY FWHK

Total capacity

kW

Sensible capacity

kW

Total power input

kW

Total capacity

kW

Total power input

kW

12°C

15ºC

20ºC

25ºC

30ºC

35ºC

40ºC

10,87
11,07
11,30
11,24
11,44
11,63
12,10
12,30
12,50
12,85
13,06
13,30
13,39
13,59
13,84

-----

-----

-----

-----

-----

-----

-----

-----

----­1463
1829
2195
1463
1829
2195
1463
1829
2195
1463
1829
2195
1463
1829
2195

----­1829
2195

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

-----

-----

----­29
45
66
29
45
66
29
45
66
29
45
66
29
45
66

----­45
66

-----

-----

----­12,55
12,62
12,68
11,92
11,99
12,05
11,08
11,15
11,21
10,14
10,20
10,26

9,19
9,25
9,32

-----

8,41
8,48

-----

-----

----­8,65
8,66
8,71
8,48
8,51
8,54
8,19
8,22
8,25
7,89
7,92
7,95
7,59
7,62
7,65

----­7,28
7,29

-----

-----

----­2,24
2,20
2,16
2,42
2,38
2,33
2,61
2,55
2,50
2,79
2,73
2,67
2,97
2,91
2,85

----­3,09
3,02

2,97
3,01
3,05
3,02
3,05
3,08
3,12
3,15
3,19
3,20
3,23
3,27
3,25
3,29
3,33

-----

-----

-----

-----

-----

-----

Water inlet

temperature ºC

Water flow

l/h

Water pressure

drop
kPa

COOLING CAPACITY FWCK/FWHK HEATING CAPACITY FWHK

Total capacity

kW

Sensible capacity

kW

Total power input

kW

Total capacity

kW

Total power input

kW

12°C

15ºC

20ºC

25ºC

30ºC

35ºC

40ºC

13,25
13,50
13,78
13,71
13,95
14,19
14,76
15,00
15,24
15,67
15,92
16,22
16,32
16,58
16,88

-----

-----

-----

-----

-----

-----

-----

-----

----­1872
2340
2808
1872
2340
2808
1872
2340
2808
1872
2340
2808
1872
2340
2808

----­2340
2808

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

-----

-----

----­48
75

108

48
75

108

48
75

108

48
75

108

48
75

108

----­75

108

-----

-----

----­16,00
16,08
16,16
15,20
15,28
15,36
14,12
14,21
14,29
12,92
13,00
13,08
11,71
11,79
11,88

----­10,72
10,80

-----

-----

----­11,10
11,12
11,18
10,89
10,93
10,97
10,51
10,55
10,59
10,13
10,17
10,21

9,75
9,79
9,83

-----

9,35
9,36

-----

-----

----­2,85
2,80
2,74
3,08
3,02
2,96
3,32
3,25
3,18
3,55
3,47
3,39
3,78
3,69
3,62

----­3,93
3,84

3,70
3,74
3,79
3,76
3,79
3,83
3,88
3,92
3,97
3,98
4,02
4,07
4,05
4,09
4,15

-----

-----

-----

-----

-----

-----

Water inlet

temperature ºC

Water flow

l/h

Water pressure

drop
kPa

COOLING CAPACITY FWCK/FWHK HEATING CAPACITY FWHK

Total capacity

kW

Sensible capacity

kW

Total power input

kW

Total capacity

kW

Total power input

kW

12°C

15ºC

20ºC

25ºC

30ºC

35ºC

40ºC

DB.- Dry bulb.
WB.- Wet bulb.

FWCK/FWHK 16 -Nominal air flow 2500 m3/h

FWCK/FWHK 22 - Nominal air flow 3500 m3/h

8

Nominal capacity conditions: Exchanger air inlet temperature: 27ºC DB/19ºC WB for cooling y 20ºC WB for heating mode.
For another working conditions use correction factor tables.

16,35
16,65
16,99
16,91
17,20
17,50
18,20
18,50
18,80
19,32
19,64
20,01
20,13
20,45
20,82

-----

-----

-----

-----

-----

-----

-----

-----

----­2131
2664
3197
2131
2664
3197
2131
2664
3197
2131
2664
3197
2131
2664
3197

----­2664
3197

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

-----

-----

----­20
35
54
20
35
54
20
35
54
20
35
54
20
35
54

----­35
54

-----

-----

----­18,34
18,43
18,53
17,42
17,51
17,60
16,19
16,28
16,38
14,81
14,90
14,99
13,42
13,52
13,61

----­12,29
12,38

-----

-----

----­12,03
12,05
12,11
11,80
11,84
11,88
11,39
11,43
11,47
10,98
11,02
11,06
10,57
10,61
10,65

----­10,13
10,15

-----

-----

----­3,51
3,45
3,38
3,80
3,73
3,65
4,10
4,00
3,92
4,38
4,28
4,18
4,66
4,56
4,46

----­4,85
4,74

4,56
4,61
4,67
4,63
4,67
4,72
4,78
4,83
4,89
4,90
4,95
5,02
4,99
5,04
5,11

-----

-----

-----

-----

-----

-----

Water inlet

temperature ºC

Water flow

l/h

Water pressure

drop
kPa

COOLING CAPACITY FWCK/FWHK HEATING CAPACITY FWHK

Total capacity

kW

Sensible capacity

kW

Total power input

kW

Total capacity

kW

Total power input

kW

12°C

15ºC

20ºC

25ºC

30ºC

35ºC

40ºC

21,65
22,06
22,51
22,39
22,78
23,17
24,11
24,50
24,89
25,59
26,00
26,50
26,66
27,08
27,57

-----

-----

-----

-----

-----

-----

-----

-----

----­2894
3618
4342
2894
3618
4342
2894
3618
4342
2894
3618
4342
2894
3618
4342

----­3618
4342

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

Minimum

Nominal

Maximum

-----

-----

----­43
72

108

43
72

108

43
72

108

43
72

108

43
72

108

----­72

108

-----

-----

----­24,74
24,87
24,99
23,50
23,62
23,75
21,84
21,96
22,09
19,97
20,10
20,23
18,11
18,24
18,36

----­16,58
16,70

-----

-----

----­16,57
16,59
16,69
16,25
16,31
16,37
15,69
15,75
15,80
15,12
15,18
15,24
14,56
14,61
14,67

----­13,95
13,98

-----

-----

----­4,85
4,76
4,67
5,25
5,15
5,04
5,65
5,53
5,41
6,05
5,91
5,78
6,43
6,29
6,16

----­6,70
6,54

6,28
6,35
6,43
6,37
6,43
6,49
6,58
6,65
6,73
6,75
6,82
6,91
6,87
6,94
7,04

-----

-----

-----

-----

-----

-----

Water inlet

temperature ºC

Water flow

l/h

Water pressure

drop
kPa

COOLING CAPACITY FWCK/FWHK HEATING CAPACITY FWHK

Total capacity

kW

Sensible capacity

kW

Total power input

kW

Total capacity

kW

Total power input

kW

12°C

15ºC

20ºC

25ºC

30ºC

35ºC

40ºC

DB.- Dry bulb.
WB.- Wet bulb.

Dissipated heat for cooling mode:

The heat to dissipate in the water exchanger for cooling mode is near to: Total capacity + total power input.

Absorbed heat for heating mode:

The heat absorbed in the water exchanger for heating mode is near to: Total capacity - total power input.

Water pressure drop has been calculated without water filter an option. With this option, the water pressure drop (kPa) is:

04

31
37
45

06

43
57
74

07

59
83

113

08

72
105
145

10

50
67
87

12

69
96

130

16

42
57
76

22

65
94

130

MODELS
Minimum

Nominal

Maximum

Water flow

l/h

WATER PRESSURE DROP WITH WATER FILTER FWCK/FWHK

AIR FLOW

AIR INLET

9

The data in the capacity tables, have been calculated for nominal air flow; with maximum/minimum air flows use
these correction factors:

TC: Total capacity
SC: Sensible capacity
D.B.: Dry bulb
W.B.: Wet bulb

COOLING MODE FWCK/FWHK

21ºC 24ºC 27ºC 29ºC 32ºC

15ºC
17ºC
19ºC
21ºC
23ºC

0,908
0,956
1,008

-----

-----

0,883
0,722
0,576

-----

-----

0,984
0,993
1,002

-----

-----

0,908
0,956
1,008
1,066

-----

1,124
0,949
0,787
0,662

-----

0,984
0,993
1,002
1,011

------

0,908
0,956
1,000
1,066
1,128

1,211
1,145
1,000
0,885
0,669

0,984
0,993
1,000
1,011
1,019

0,908
0,956
1,000
1,066
1,128

*
1,259
1,143
1,029
0,805

0,984
0,993
1,000
1,011
1,019

0,908
0,956
1,000
1,066
1,128

*
*

*
1,239
1,010

0,984
0,993
1,000
1,011
1,019

FWCK/FWHK 04

FWCK/FWHK 06

TOTAL CAPACITY

TOTAL CAPACITY

AIR FLOW

FWCK/FWHK 07

TOTAL POWER INPUT

SENSIBLE CAPACITY

TOTAL POWER INPUT

Maximum Nominal Minimum Maximum Nominal Minimum Maximum Nominal Minimum

FWCK/FWHK 08

FWCK/FWHK 10

TOTAL CAPACITY

TOTAL CAPACITY

AIR FLOW

FWCK/FWHK 12

TOTAL POWER INPUT

SENSIBLE CAPACITY

TOTAL POWER INPUT

Maximum Nominal Minimum Maximum Nominal Minimum Maximum Nominal Minimum

FWCK/FWHK 16

FWCK/FWHK 22

TOTAL CAPACITY

TOTAL CAPACITY

AIR FLOW

TOTAL POWER INPUT

SENSIBLE CAPACITY

TOTAL POWER INPUT

Maximum Nominal Minimum Maximum Nominal Minimum

CORRECTION FACTORS

The data in the capacity tables has been calculated for air inlet temperature: 20ºC DB. For another conditions use these
correction factors.

The data in the capacity tables has been calculated for air inlet temperature: 27ºC DB and 19ºC WB. For another conditions
use these correction factors.

HEATING MODE FWHK

15ºC
17ºC
20ºC
22ºC
24ºC

TC

kW

Total power input

kW

NOTE: Highlight values: total capacity and sensible capacity are the same value.

1,008
1,005
1,000
0,996
0,993

0,920
0,955
1,000
1,030
1,062

CoolingHeating

1050
1,040
1,139
1,018

1,02
1,01

750
1,000
1,000
1,000

1,00
1,00

450
0,900
0,799
0,982

0,95
1,09

1550
1,040
1,136
1,020

1,02
1,01

1100
1,000
1,000
1,000

1,00
1,00

600
0,904
0,797
0,993

0,94

1,11

1400
1,023
1,063
1,005

1,01
0,99

1200
1,000
1,000
1,000

1,00
1,00

800
0,942
0,861
0,980

0,96
1,07

CoolingHeating

2350
1,004
1,082
1,017

1,02
0,99

1900
1,000
1,000
1,000

1,00
1,00

1000
0,890
0,791
0,983

0,94
1,12

2250
1,013
1,047
1,015

1,01
0,99

2000
1,000
1,000
1,000

1,00
1,00

1200
0,922
0,818
0,985

0,95

1,09

3100
1,022
1,089
1,026

1,02
1,00

2500
1,000
1,000
1,000

1,00
1,00

1500
0,913
0,808
0,980

0,95
1,09

CoolingHeating

3100
1,037
1,090
0,953

1,02
1,00

2500
1,000
1,000
1,000

1,00
1,00

1800
0,946
0,880
0,974

0,97
1,05

4500
1,029
1,110
1,019

1,02
1,00

3500
1,000
1,000
1,000

1,00
1,00

2250
0,918
0,833
0,979

0,96

1,08

Air inlet temperature

ºC-D.B.

TC
kW

Power input

kW

SC
kW

Air inlet temperature

ºC-W.B.

Air inlet temperature

ºC-D.B.

TC

kW

Power input

kW

SC
kW

TC
kW

Power input

kW

SC
kW

TC
kW

Power input

kW

SC
kW

TC

kW

Power input

kW

SC
kW

DIMENSIONS

10

I

H

G

E

F

D

RETURN AIR

Ñ

N

M

K

L

J

20

SUPPLY AIR

38

B

A

C

A

SUPPLY AIR

RETURN AIR

A

B

C

MOTOR FAN
COMPRESSOR
COIL
AIR FILTER
WATER EXCHANGER
ELECTRICAL BOX
DRAIN PAN
INLET/OUTLET WATER CONNECTION
POWER SUPPLY
DRAINAGE TUBE
MOTOR (ONLY MODEL 22)

1
2
3
4

7
8
9

10

11

DRAINAGE TUBE DIAMETER

FWCK/FWHK

04-06-07

FWCK/FWHK

08-10-12-16-22

16 mm 27 mm

STANDARD
OPTION

D
E
F
G
H

I
J

K

L

M

Ñ

N

P

O

WATER INLET/OUTLET

O

P

FWCK/FWHK 04-06-07

FWCK/FWHK 12-16-22

FWCK/FWHK 08-10

(*) (*)

(*)

(*) (*)

(*)

(*)

(*) (*)

(*)

(*) with air outlet

(option)

(*) with air outlet

(option)

(*) ACCESS TO THE UNIT

Inlet

Outlet

6

5

A
B
C

04-06-07 08-10 12-16-22

440
792
492
356
370

66
36

385

19
64

420

8

38

382

20
55

266

505

1503

703
547
910

46
26

460

19
143
523

37

26
459

20

95
266

465

1083

623
541
490

52
26

420

19
122
478

23

26
419

20

55
266

AIR OUTLET

(OPTION) (not for model 22)

AIR INLET

AIR OUTLET

1

2

3

8

9

10

6

5

11

4

7

AIR INLET

AIR OUTLET

AIR OUTLET

(OPTION)

1

2

3

5

8

9

10

6

4

7

AIR OUTLET

AIR INLET

1

2

3

5

8

9

10

6

4

7

11

WATER CONTAINING COPPER

AISI 316

CONCENTRATION

mg/l or ppm

Alcanity (HCNO3)

Sulfate (SO4

2-

)

HCO3 / SO4

2-

Electrical conductivity

pH

Ammonium (NH3)

Chloroides (Cl

-

)

Free chlorine (Cl2)

Hydrogen sulfide (H2S)
Free (aggressive) Carbon Dioxide (CO2)

Total hardness (ºdH)
Nitrate (NO3)

Iron (Fe)
Aluminum (Al)
Manganese (Mn)

0
+
0

+

-

-

+

-

0
+
0
0
0
+
0

+
0

-

+
0

+
0

-

+

­+
0

-

+
0

+
0

+
0

+
0

+

+
+
+

+
+
0

+
+

+
+
+
0

0/+

+
+

+
+
+

+
0

+
+

0/+

+
+
+
+
+

+
+

+
+

+
+

+
+

+

<70

70-300

>300

<70

70-300

>300

>1.0
<1.0

<10 µS/cm

10-500 µS/cm

>500 µS/cm

<6.0

6.0-7.5

7.5-9.0
>9.0

<2

2-20

>20

<50
>50

<1
1-5
>5

<0.05
>0.05

<5

5-20

>20

4.0-8.5

<100
>100

<0.2
>0.2

<0.1
>0.1

<0.2
>0.2

PRE-INSTALLATION
Prior to install the equipment, make sure of the following points:

• Leave enough space for access to air supply, water section, power supply and condensed outlet.

• The water section must have the correspondent valves.

• Easy extraction of the air filter.

• Easy access to lateral panel for easy accessibility to all services of the unit.

• Unit must be mounted with antivibration.

• The electrical section must be done following legal normative

• Check that the tension is the same as installation place.

• Keep in mind power supply for maximum consumption for each unit.

• Check water quality, across analysis according to local normative. If quality of water is not good, it may be necessary to install
a device to decalcify.

• Corrosion resistance of plates exchanger: The resistance guide below is an attempt of give a picture of the corrosion resistance
of the stainless steel of the type AISI 316 and pure copper in the water, to a number of important chemical factors. The actual
corrosion is however a very complex process influenced by many factors in combination. This table is therefore a considerable
simplification and should not be overvalued.

• Keep in mind water inlet temperature to the unit. If this temperature is below 15ºC for cooling only units (FWCK), you will need
to install a water regulation pressostatic valve (as an option element) to keep condensation temperature value between 40
and 45ºC.

Flow switch can be asked as an option. It stops the unit if there no water flow or if the water flow is below minimum value.

• Be sure that air flow is according to the ducts installation.

Explanations:
+ Good resistance under normal conditions.
0 Corrosion problems can occur especially
when the factors are valued as 0.

- Use is not recommended

INSTALLATION

It is very important that the unit works with water flows between maximum and minimum values according to the

tables. You have to calculate water pump and install regulation valve if they are needed, in order to be sure that
the unit works with water flow values indicated in the tables. Specially for heat pump units FWHK in heating mode,
if the unit works with water flow below specified values, the unit can be seriously damaged, water exchanger can
be frozen.

12

• Make sure that water connections are correct, water inlet (upper side), water outlet (down side).

INSTALLATION

• All installation must be carried out by qualified personnel.

Air flow:

• All models include three fan speed motor fan, except for FWCK/FWHK 22 models. The transmission for this model is
done through pulleys and belts.

• Make the motor fan connections for the fan speed required and adjust the pulley for FWCK/FWHK 22 models in order
to adequate the air flow needed for the installation.

• Use the flexible tube connected to the drip tray as a drainage tube. Cause a siphon with this tube in

order to avoid the inlet of scents from the installation to the unit.
Install a siphon from the drainage tube of the drip tray with a difference in height of 80 mm to prevent from
not evacuating due to the negative pressure created by the fans. The pipe will slope down 2% to make it
easier for the condensates to drain off.

Lennox offers this element as an option.

• Install cut off valves at inlet and outlet water connections, because of in case of repairs, the hydraulic circuit can be independent.

• After supply the power to the unit and connect inlet/outlet water:

The unit can be work properly until next maintenance revision.

- Outlet and inlet water temperature are correct according to the water flow which is between specified values.

Drainage tube:

- Connect the gauges in high pressure and low pressure side.

- Use a temperature probe in the compressor gas pipe and another ones in the inlet and outlet water pipes.

- Start water pump.

- Make sure to close the unit all panels have to be correctly situated.

- Start the unit and make sure that the thermostat temperature adjustment is correct.

- Check the correct water flow with a differential gauge device connected between the inlet and outlet water connections
in order to know the pressure difference. Check it according to the capacity table values.

In addition, you can know the correct water flow with ∆t measurement (inlet temperature ºC - outlet temperature ºC).
This value has to be the same as the value calculated with this formula:

- High and low pressure values and in addition saturation temperatures according to the correct working mode of the
unit.

- Gas reheating values are below 12ºC.

If it is not correct, please check expansion system and refrigerant leaks.

• After verify the correct working mode, please stop the unit, disconnect the gauges and temperature probes. and clean water
filter.

Hydraulic circuit:

Installation:

Make sure to disconnect power supply before carrying out any type of work on the unit.

• Install water inlet and water outlet connections with a differential gauge device in order to see the pressure difference between

the outlet an inlet connections.

• At the end Install an adequate water pump, and all the necessary elements for the installation

Use flexible components for the hydraulic connection between the unit and the installation in order to

prevent the transmission of vibrations.

• After a few minutes, when the unit will be stabilised, you have to verify:

a) Cooling mode b) Heating mode

All the data water flow, cooling / heating capacity and power input are on the capacity tables according to each model

and the working conditions.

Water filter in the inlet water connection has to be used. The step of the mesh should be less than

A 0.5 mm which avoids welded and dirty get to the unit.

[Cooling capacity (kW) + Total power input (kW)] x 860

Water flow (l/h)

∆t =

[Heating capacity (kW) - Total power input (kW)] x 860

Water flow (l/h)

∆t =

If the compressor noise is very high and in addition, high and low pressure values are similar, it can

be possible a wrong phase electrical connection. In this case, please change the connection for two
phases.

Inspection and

cleaning stopper.

2%

Min. 80 mm.

13

•The unit under supply, has rotating objects and generates high temperatures into the pipes.

FAILURE DIAGNOSIS

SERVICE AND MAINTENANCE

(*) Reset the unit, turning the power off/on after the cause which produced the cut on high/low pressure switch has been repaired.

• Air filter: Clean the filter periodically (maximum each 6 months), but the clean of the filter depends on the ambient where the
unit is working.

Make sure to turn off electrically the unit before to access for maintenance or revision.

PROBLEMS CAUSES

• Low pressure cut (electrical reset) (*).

• Low cooling capacity.

• Freeze on coil.

• Very low air inlet temperature.

• Low air flow, due to dirty air filter, or wrong design of ducts.

• Very low water inlet temperature.

• There is not enough refrigerant (Check leaks).

• Very high water inlet temperature.

• Low water flow or water flow interruption (check water pump
selection, water valve regulation or water filter cleaning).

• Very high air temperature.

• There is a lot of refrigerant.

• High pressure cut (electrical reset) (*).

• High consumption.

• Thermal compressor protection cut.

• Low pressure cut (electrical reset) (*).

• Low evaporating temperature cut (*).

• Flow water cut (*).

• Low water flow or water flow interruption (check water pump
selection, water valve regulation or water filter cleaning).

• Very low water inlet temperature.

• There is not enough refrigerant (Check leaks).

• Very low air inlet temperature.

• Check expansion valve regulation.

• High pressure cut (electrical reset) (*).

• High consumption.

• Compressor thermic protection cut.

• Very high water inlet temperature.

• Very high air inlet temperature.

• Low air flow, due to dirty air filter or wrong design of ducts.

• There is a lot of refrigerant.

• Security elements: The unit includes electrical elements of security (Internal thermal protections on the compressor and motor
fan, external thermal protections on the compressor and three-phase motor) and cooling elements of security like high and
low pressure switches with electrical reset. Heat pump units include as standard a differential water switch in the water circuit.
If unit operating limits are out of working conditions, some protections will be on.

• Water filter: Clean the filter periodically.

COOLING MODE

(FWCK/FWHK)

HEATING MODE

(FWHK)

Risk of evaporator freezing.

14

OPERATION
On a system operated with refrigerant R-407C, during the evaporation phase at constant pressure the temperature increases;
and during the condensation phase at constant pressure the temperature decreases a certain value. Consequently, the terms
“evaporation temperature” and “condensation temperature” should be redefined.
The refrigerant R-407C is a mixture of other three refrigerants that behave as pure compounds. This fact makes that the
operations of installation, service and maintenance must be special, for the next operations:

COMPRESSOR OIL
With HFC refrigerants as R-407C, the compressors incorporate ester oil instead of mineral oil used for R22 (HCFC).

LEAKS
If a leak takes place in the system that has produced an important evacuation of the refrigerant charge, instead of recharging
the system, it is convenient to eliminate the whole charge completely, the system must be evacuated and charged again or to
introduce the charge according to an specified value.

REFRIGERANT CHARGING
To maintain the mixture composition, the refrigerant must be charged always in liquid phase. For what it is necessary to have
special caution when it is little quantity of refrigerant in the bottle.

VACUUM OF THE SYSTEM (When the unit has loosed refrigerant charge).
Vacuum must be done until 0.225 mm Hg, since the compressor oil high hygroscopic degree can cause corrosion in some
metallic materials.

This unit can only work with R-407C Refrigerant.

Do not use another type of refrigerant.

SERVICE AND MAINTENANCE

PROTECTIONS ADJUSTMENT (FWCK / FWHK)

DESCRIPTION EFFECT

STD high pressure switch. (HP)

UNITS

FWHK FWCK

RATED

OFF ON

X X 28,7 kg/cm224 kg/cm

2

Unit stops

RESET

Manual (electric)

High pressure switch (HP) with
presostatic valve as option.

N/A X 24 kg/cm219 kg/cm

2

Unit stops Manual (electric)

Low pressure switch (LP). X X (*) 1,8 kg/cm22,7 kg/cm

2

Unit stops Manual (electric)

Thermostat anti-freeze (BT). X N/A + 5ºC +7,3ºC

Unit stops Manual (electric)

Differential water switch (DFS). X N/A Without regulation Unit stops Manual (electric)

Flow switch (FS) option. X X

Nominal water flow
(see capacity tables)

Unit stops Manual (electric)

Heat overload sensor (ID). X N/A + 63ºC +46ºC

FWHK unit stops
on heating mode

1º automatic reset.
2º Press ON/OFF button
in the controller

Coil anti-freeze sensor (ID). X X + 0ºC (**) +12ºC

Cooling only units

or heat pump units

on cooling mode

stop.

Automatic

N/A: Not available.
(*) Not available for 04-06-07 models.
(**) With 0ºC during 1 min. and the compressor working during 10 min.
Manual (electric) reset means electrical reset for the unit turning the power off / on after the cause which produced the cut has
been repaired.

15

PRESSURE AIR DROP = 15 Pa.
PRESSURE WATER DROP = 20K Pa
DATA CALCULATED FOR AIR FLOW = 1100 m3/h

PRESSURE AIR DROP =

20 Pa.

PRESSURE WATER DROP =

40 kPa

DATA CALCULATED FOR AIR FLOW =

2000 m3/h

PRESSURE AIR DROP =

13 Pa.

PRESSURE WATER DROP =

50 kPa

DATA CALCULATED FOR AIR FLOW =

2500 m3/h

PRESSURE AIR DROP =

18 Pa.

PRESSURE WATER DROP =

50 kPa

DATA CALCULATED FOR AIR FLOW =

3500 m3/h

Hot water coil

Attachment profiles

THREE PHASE PROTECTION (THREE PHASE UNITS)

Located at the electrical box of the unit, it assures that unit will not begin operation if connection phases of compressor are
not correct. Should this occur, then just switch two phase connections.

COMPRESSOR ACOUSTIC JACKET

Each compressor is fitted with a compressor acoustic jacket this provides attenuation of the compressor noise that radiates
from the unit when in operation.

HOT WATER COIL 1 ROW TECHNICAL DATA

(for cooling only units).

OPTIONS

FWCK/FWHK 12-16

FWCK/FWHK 08-10

FWCK/FWHK 04-06-07

CAPACITY IN kW FOR WATER FLOW OF 250 L/H .

60

50

40

DIFFERENCES BETWEEN WATER INLET

TEMPERATURE AND COIL AIR INLET

TEMPERATURE (ºC)

5,10 4,25 3,40

CAPACITY IN kW FOR WATER FLOW OF

350 L/H .

60

50

40

7,70 6,50 5,20

CAPACITY IN kW FOR WATER FLOW OF

600 L/H .

60

50

40

12,40 10,30 8,30

FWCK/FWHK 22

CAPACITY IN kW FOR WATER FLOW OF

600 L/H .

60

50

40

13,60 11,30 9,00

DIFFERENCES BETWEEN WATER INLET

TEMPERATURE AND COIL AIR INLET

TEMPERATURE (ºC)

DIFFERENCES BETWEEN WATER INLET

TEMPERATURE AND COIL AIR INLET

TEMPERATURE (ºC)

DIFFERENCES BETWEEN WATER INLET

TEMPERATURE AND COIL AIR INLET

TEMPERATURE (ºC)

This option kit includes a hot water coil with two attachment
profiles for coil to the unit.
Make sure to install the hot water coil to the aspiration of
the unit, then:

• Dismount the air filter attachment.

• Fix the attachment profiles with screws to the

aspiration.

• Fix the hot water coil to the attachment profiles.

• Put the air filter again across the profiles.

Air filter

INSTALLATION

16

5 kW 1 Step
6 kW 1 Step

9 kW 1 Step
9 kW 1 Step

12 kW 1 Step

3 kW 1 Step

UNIT

Water exchanger

Valve spindle

of regulation

Connect to high

pressure plug

Presostatic

valve

Flow switch

Water filter

WATER INLET

WATER OUTLET

NOTE:

Install one of then.
You can not use both
in the same unit.

ELECTRICAL HEATER

WATER FIL TER

This option is supplied loose.
The water filter must be fitted in the water
inlet of the unit, it protects the unit against
particles (greater than 1 mm) getting
inside the water circuit, and prevents the
water interchanger gets dirty.
With water filter water pressure drop
has a different value (see table page 8).

FLOW SWITCH

This option is supplied loose.
It should be used for heat pump units
(FWHK).
The flow switch stops the unit if water
flow is lower than the nominal.
Electrical reset.

MAIN SWITCH (Not available for 04/06/07 models)

The main switch is equipped with a gadget, which allows opening the panel of the electrical box, when it is on OFF position.
Verify that the main switch is large enough to handle the current for the unit.

OPTIONS

Power

230 V 1Ph -50Hz

FWCK/FWHK 06-07

FWCK/FWHK

08-10

FWCK/FWHK

12-16-22

230 V /400 V 3Ph -50Hz

230 V /400 V 3Ph -50Hz

Voltage

FWCK/FWHK 04

230 V 1Ph -50Hz

INSTALLATION

• The electrical heater should be installed into the impulsion fan of the unit.

• Fix the electrical heater to the unit with the screws (see the figure above).

• Take out the knock out, and take the electrical supply of the electrical heater to the electrical box of the unit. There is a different

power supply for electrical heater (see page 4).

PRESOSTATIC VALVE (only for units FWCK)

This option is supplied loose.
If water inlet temperature is below 15ºC use a pressostatic valve to keep adequate condensation temperature levels (40º to
45ºC).
The maximum inlet water temperature with this option is 35ºC.

PRESSOSTATIC VALVES REGULATION

• Connect a manometer of high pressure (30 bar) in the refrigerant circuit.

• Turn over the spindle in the head of the valve (turn right: the valve is opened; turn left: the valve is closed) regulating the water

flow which enters into the unit.

• You must leave the unit working at least 10 minutes and see the indication of the manometer. If the condensation pressure
temperature is approximately 45ºC, the valve is correctly regulated. If not, restart the regulation as described before.

INSTALLATION

• Replace the outlet pipe of the plate exchanger inside the unit for a pressostatic valve.

• Keep in mind the row direction indicated in the valve.

• Connect the capillary tube of the valve to the plug of high pressure in the pipe of the unit.

OPERATION
The pressostatic valve keeps the condensation pressure values regulating the inlet water flow in the condenser.
When the condensation pressure is up, the valve will be opened, and more water is entered. And when the pressure is low
the valve will be closed.

Electrical heater

Knock out

Electrical box

17

POINTS TO KEEP IN MIND

Abrasive

surfaces

Low

temperature

High

temperature

Risk of injury with

moving objects

Electrical

voltage

Risk of injury with

rotating objects

All technical data contained in these operating instructions including the diagrams and technical description remains the
property of Lennox and may not be used (except for the purpose of familiarizing the user with the equipment), reproduced,
photocopied, transferred or transmitted to third parties without prior written authorization from Lennox.

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 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, familiarize 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.

STANDARD GUIDELINES TO LENNOX EQUIPMENT

ELECTRICAL CONNECTIONS

Electrical shock hazard can cause
injury or death. Before attempting to
perform any service or maintenance
on the unit, turn OFF the electrical
power.

Check the air filter and
make sure it is not blocked
with dust or dirt

FILTER CLEANING

If the filter is dirty, wash it in a bowl
neutral soap and water, drying it in the
shade before inserting it in the unit.

ATTENTION - WARNING

Make sure to open the power off switch before to install, repair or make maintenance works in the unit, in order to

prevent serious electrical injuries.

To install the unit, keep in mind local and national legislation.

The air filter cleaning operations do not
require technical service; however when
an electrical or mechanical operation
is required call an Engineer.

DANGER AND WARNING SIGNS

18

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Due to Lennox’s ongoing commitment to quality,

the Specifications, Ratings and Dimensions are

subject to change without notice and without

incurring liability.

Improper installation, adjustment, alteration,

service or maintenance can cause property

damage or personal injury.

Installation and service must be performed by a

qualified installer and servicing agency.

BELGIUM, LUXEMBOURG

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OTHER COUNTRIES

MIL101E-0105 12-2009
Original manual translation