Lennox FLATAIR KFC Series User manual

1
1.1.- PHYSICAL DATA
1.2.-FAN SERVICES
1.3.- ELECTRICAL DATA
1.4.- OPERATING LIMITS
1.5.- UNIT DIMENSIONS
1.6.- SIZES OF STANDARD AND OPTIONAL OPENINGS
1.7.- AVAILABLE OPTIONS
DATA PAGE FOR UNIT COMMISSIONING
4.- MAINTENANCE
4.1.- PREVENTIVE MAINTENANCE
4.2.- CORRECTIVE MAINTENANCE
4.3.- FAILURE DIAGNOSIS
2.- INSTALLATION
3.- COMMISSIONING AND OPERATION
1.- GENERAL CHARACTERISTICS PAGE
PAGE
PAGE
PAGE
3
3
4
5
6-8
9-10
11
12
12
13-14
15
16
16
17-20
21-22
23
24
25
26
27
TABLE OF CONTENTS
PAGE 2
2.1.- INSTALLATION GUIDELINES
2.2.- UNIT INSTALLATION
2.3.- OPTIONAL TASK PRIOR TO UNIT INSTALLATION:
CHANGING THE POSITION OF BLOWERS AND AIR INTAKE
2.4.- UNIT LOCATION AND WEIGHT DISTRIBUTION
2.5.- INSTALLATION CLEARANCES
2.6.- DRAINS
2.7.- REFRIGERANT CONNECTIONS
2.8.- ELECTRICAL CONNECTIONS
3.1.- PRELIMINARY CHECKS
3.2.- STEPS TO FOLLOW FOR COMMISSIONING THE UNIT

2
UNIT: SERIAL No.:
INSTALLATION ADDRESS:
INSTALLER: INSTALLER TEL.:
CHECKS:
SUPPLY VOLTAGE:
DATA INPUT:
Air Intake Temperature to the coil: ºC
DATE OF COMMISSIONING:
INSTALLER ADDRESS:
RATED VOLTAGE OF THE UNIT:
YES NO
GENERAL POWER SUPPLY CONNECTION
CONTROL PANEL CONNECTION
COOLING CYCLE HEATING CYCLE
Air Output Temperature to the Coil: ºC
High Pressure:
Low Pressure:
Options Installed:
ºC
High Pressure:
Low Pressure:
ºC
Comments:
COMPRESSOR OIL LEVEL INDICATOR
UNIT ON SHOCK ABSORBERS
DRAINAGE WITH TRAP
CONTROL PANEL IDENTIFICATION CODE
DATA PAGE FOR UNIT COMMISSIONING
ELECTRIC POWER CONSUMPTION
Compressor
Fan
Compressor
Fan
(Amps)
Air Intake Temperature to the coil:
Air Output Temperature to the Coil:

3
1.- GENERAL CHARACTERISTICS
1.2.- FAN SERVICES
3
m /h
3
AIR FLOW
REFRIGERANT CHARGE NITROGEN (*)
KFHA: Heat pump unit R-22
KFCK: Cooling only unit R-407C
KFHK: Heat pump unit R-407C
NET WEIGHT
Cooling only units KFC
Heat pump units KFH
1.1.- PHYSICAL DATA
COMPRESSOR Nº / Type
130 135
Kg
180
1 / Scroll 1 / Scroll 1 / Scroll 1 / Scroll
195 265 285
1 / Scroll 1 / Scroll
275
1 / Scroll
10 12 16 22 24 28 30
Kg
135 140 185 200 270 285280
NOMINAL
AIR FLOW
MODELS
AVAILABLE STATIC PRESSURE Pa.
(*) The units are supplied with nitrogen gas, this must be removed and charge the unit with refrigerant R-22 or R-
407C, depends on unit model.
(See page 20, to calculate model refrigerant charge)
6600 6400 64003500 3400 4950 59000
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
6490 6300 63003410 3325 4850 5800
6340 6200 62003300 3160 4750 5700
6225 6100 61003190 3075 4625 5600
6100 5980 59803080 2980 4525 5495
5960 5870 58702970 2890 4425 5390
5850 5725 57252840 2790 4325 5280
5710 5600 56002700 2690 4225 5180
5600 5490 54902560 2580 4125 5075
5480 5375 53752410 2400 4040 4975
5350 5250 52502350 3940 4875
5200 51003840 4775
5090 50003750 4675
49504575
48004460
46504350
4500
10 12 16 22 24 28 30
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UNIT MODEL

4
1.- GENERAL CHARACTERISTICS
V/f (50 Hz)
V/f (50 Hz)
1.3.- ELECTRICAL DATA
3,21 Kw 3,84 5,65 7,376,25
Total power in Cooling cycle
Total power in heating cycle
Voltage
230V-400V/ 3Ph
230V/ 1Ph
KFHA 12KFHA 10 KFHA 16 KFHA 22 KFHA 24 KFHA 28 KFHA 30
KFCK 12
KFHK 12
KFCK 10
KFHK 10
KFCK 16
KFHK 16
KFCK 22
KFHK 22
KFCK 24
KFHK 24
KFCK 30
KFHK 30
KFCK 28
KFHK 28
Kw
Kw
Kw
Maximum current
Rated absorbed power
2,03 2,54 Kw 2,94 3,70 4,85 6,485,48
Total power in cooling cycle
Total power in heating cycle
Voltage
230V-400V/ 3Ph
230V/ 1Ph
Kw
Kw
Kw
0,52 0,52 1,10 1,60 1,60 1,601,60
Maximum current
Total current
Start up current
0,52 0,52 1,10 1,60 1,60 1,601,60
2,60 3,41 Kw 4,11 5,02 5,85 8,837,41
Rated absorbed power
2,26 3,60
2,79 3,68 Kw 4,41 5,20 6,05 9,257,43
Total Current
Start up current
UNIT MODELS
UNIT MODELS
A
A
16,7/7,2 19,3/8,7 19,9/11,5 22,4/12,9 25,3/14,6 36,5/21,028,5/16,3
A
A
177/109183/83181/109193/110148/77102/5496/47
99
3,1 3,1
4,8/2,8 7,4/4,3 8,1/4,7 8,1/4,7 8,1/4,7
18,6
A
A
A
A
177/109183/83181/109193/110148/77102/5496/47
99
3,1 3,1
4,8/2,8 7,4/4,3 8,1/4,7 8,1/4,7 8,1/4,7
16,7/7,2 19,3/8,7 19,9/11,5 22,4/12,9 25,3/14,6 36,5/21,028,5/16,3
18,6
Fan
Compressor (heating cycle)
Fan
Compressor
Fan
Compressor (cooling cycle)
Compressor (heating cycle)
Compressor (Cooling cycle)
Compressor
Fan
3,12 3,93 5,21 6,62
2,55 3,06 3,50 5,30
7,45 10,43
6,45 8,08
9,01
7,08
44,6/25,736,6/21,033,4/19,329,8/17,224,7/14,3
22,4/11,819,8/10,3
21,7
3,31 4,20 5,51 6,80
2,78 3,73 4,70 5,44
7,65 10,85
7,25 8,97
9,03
7,85
44,6/25,736,6/21,033,4/19,329,8/17,224,7/14,3
22,4/11,819,8/10,3
21,7

5
1.- GENERAL CHARACTERISTICS
(To install with LFXO / LFCK / LFHK / LFHA indoor unit)
INDOOR
TEMPERATURE
MAXIMUM TEMPERATURES MINIMUM TEMPERATURES
32º C DB / 23ºC WB
COOLING CYCLE
OPERATION
21º C DB / 15ºC WB
OUTDOOR
TEMPERATURE 0º C (MODELS 22/24/28/30)
19º C (MODELS 10/12/16) (*)
INDOOR
TEMPERATURE
MAXIMUM TEMPERATURES MINIMUM TEMPERATURES
32º C DB / 23ºC WB 21º C DB / 15ºC WB
OUTDOOR
TEMPERATURE
INDOOR
TEMPERATURE 27º C DB 21º C BD / 15ºC WB
OUTDOOR
TEMPERATURE 24º C DB / 18ºC WB -10º C DB / -11ºC WB
0º C (MODELS 22/24/28/30)
19º C (MODELS 10/12/16) (*)
COOLING CYCLE
OPERATION
heating CYCLE
OPERATION
OPERATING LIMITS FOR (COOLING ONLY) UNITS
OPERATING LIMITS FOR (heating PUMP) UNITS
DB.- Dry Bulb Temperature
WB.- Wet Bulb Temperature
1.4.- OPERATING LIMITS
(*) With condensation pressure control (optional), 0 ºC minimum outdoor operating temperature
DEPENDING ON MODEL
(TABLE 1)
TABLE 1-COOLING CYCLE MAXIMUM OUTDOOR OPERATING TEMPERATURES
MODELS
With rated outdoor flow
With minimum outdoor flow
10 12 16 22 24 28 30
MODELS WITH REFRIGERANT R-407C
45
43
43
43
44
41
45
41
46
42
42
39
41
38
MODELS
With rated outdoor flow
With minimum outdoor flow
10 12 16 22 24 28 30
48
46
48
45
47
45
48
46
48
44
46
42
44
40
(*) With condensation pressure control (optional), 0 ºC minimum outdoor operating temperature
DEPENDING ON MODEL
(TABLE 1)
MODELS WITH REFRIGERANT R-22

1.5.- UNIT DIMENSIONS
1.- GENERAL CHARACTERISTICS
6
Detail drawing of
unit anchor support
25
60
40
25
80
50
20 x12
Oval hole
Control panel connection
Power supply connection
Drainage
outside thread
3/4'' Male
Electrical box
Unit anchor
support
820
349
27
303
333
25
123
6
SIDE A
SIDE B
830
324
27
355
333
25
123
6
SIDE A
SIDE B
UNITES MODEL 10-12
UNIT MODEL 16
711,6
721,6
SIDE A
SIDE B
Distance between holes
MODELS 10-12: 1300 mm
MODEL 16 = 1350 mm
184 452
425 32
1250
495
249 422
500 32
1300
595
Indoor unit
electrical
connection
Control panel connection
Power supply connection
Drainage
outside thread
3/4'' Male
Electrical box
Unit anchor
support
Connection pipes
Connection pipes
Connection pipes

7
1.5.- UNIT DIMENSIONS
1.- GENERAL CHARACTERISTICS
Detail drawing of
unit anchor support
25
60
40
25
80
50
20 x12
Oval hole
Distance between holes1500
900
900
324 92
SIDE A
SIDE B
47
355
25
300 30
SIDE C
SIDE D
UNIT MODEL 22
SIDE A
SIDE B
SIDE D
SIDE C
Liquid pipe
Gas pipe
1450
595
262 462
497 36,5
1450
595
791
Control panel
connection
Power supply
connection
Drainage
outside thread
3/4'' Male
Electrical box
Unit anchor
support
Indoor unit
electrical
connection
Connection pipes
Connection pipes
Indoor unit
electrical
connection

8
1.5.- UNIT DIMENSIONS
1.- GENERAL CHARACTERISTICS
Detail drawing of
unit anchor support
25
60
40
25
80
50
20 x12
Oval hole
1025
103
SIDE A
SIDE B
25
355
1025
SIDE C
SIDE D
677
537
124
SIDE A
SIDE B
SIDE C
SIDE D
UNITES MODEL 24-28-30
916
490 398
1500
645
410
1500
645
76
Liquid pipe
Gas pipe
Control panel
connection Power supply
connection
Drainage
outside thread
3/4'' Male
Electrical box
Unit anchor
support
Distance between holes1550
Connection pipes
Indoor unit
electrical
connection
Indoor unit
electrical
connection

1.- GENERAL CHARACTERISTICS
9
A1A0
B0 B1
A1A0
B0 B1
A0
A1
B0
B1
A0
A1
B0
B1
1.6.- UNIT OPENING SIZES
ELECTRICAL BOX
STANDARD CONFIGURATION
OPTIONAL CONFIGURATION
UNITS MODELS 10-12
UNIT MODEL 16
ELECTRICAL BOX
STANDARD CONFIGURATION
OPTIONAL CONFIGURATION
STANDARD
EXTRACTOR
OPENING
OPTIONAL
EXTRACTOR
OPENING
STANDARD
BLOWER
OPENING
OPTIONAL
BLOWER
OPENING
STANDARD
EXTRACTOR
OPENING
OPTIONAL
EXTRACTOR
OPENING
STANDARD
BLOWER
OPENING
OPTIONAL
BLOWER
OPENING
C.E.
452 269
452184
C.E.
422 304
422249
COIL
COMPRESSOR
FAN
C.E.
COIL
COMPRESSOR
FAN
C.E.
170 303
349
495
349
495
303
38
368
425
495
425
495
123
43
43
355
324
595
324
595
355
58
428
123
213
500
595
500
595
63
63

10
1.- GENERAL CHARACTERISTICS
1.6.- UNIT OPENING SIZES
ELECTRICAL BOX
STANDARD CONFIGURATION
OPTIONAL CONFIGURATION
ELECTRICAL BOX
STANDARD CONFIGURATION
OPTIONAL CONFIGURATION
STANDARD
EXTRACTOR
OPENING
OPTIONAL
EXTRACTOR
OPENING
STANDARD
BLOWER
OPENING
OPTIONAL
BLOWER
OPENING
STANDARD
EXTRACTOR
OPENING
OPTIONAL
EXTRACTOR
OPENING
STANDARD
BLOWER
OPENING
OPTIONAL
BLOWER
OPENING
C.E.
A0
A1
B0
B1
A0
A1
B0
C.E.
B1
COIL
COMPRESSOR
FAN
COIL
COMPRESSOR
FAN
UNIT MODEL 22
UNITS MODELS 24-28-30
A1A0
B0 B1
A1A0
B0 B1
355
324
595
324
595
355
391,5
92
193
497
595
497
595
61
61
193
355
410
645
410
645
355
537
40
645
214
214
103
103
537
645
462 384
462262
677 222 677
40
174

11
1.- GENERAL CHARACTERISTICS
1.7.- AVAILABLE OPTIONS
SOUND MUFFLER
Available for models 16, 22, 24, 28, 30.
Field assembled, designed to be installed at the extractor
opening of the outdoor unit in order to reduce noise, particularly
when the outdoor unit is installed without ducts, free discharge.
This kit contains the sound muffler and adapter parts for fixing
it to the unit.
OUTDOOR MOUNTING KIT
Field assembly.
This kit is comprised of an air filter and grille for outdoor air
intake which should be installed on the suction side of the
outdoor unit, and the anti-rain hood which should be installed
on the discharge side of the outdoor fan.
OUTDOOR AIR FILTER KIT
Field assembly.
The outdoor air filter should be installed on the outdoor air inlet
of the outdoor unit and is recommended when working in
heavily contaminated areas that may soil or clog the coil.
MAIN SWITCH
The main switch is located on the access panel to the electrical box in such a way that the unit is disconnected
when the panel is opened.
(Refer to the size diagram on pages 7 to 10 to see the position of the electrical box access panel).
Check to make sure that the main switch is large enough to handle the current for the unit if electric heaters are
installed.
PHASE SEQUENCER (THREE-PHASE UNIT)
The phase sequencer is located in the electrical box in the outdoor section, thus assuring that the unit will not
begin operation while the phase connection of the compressor is not correct. Should this occur, then just switch
two phase connections.
ON/OFF CONDENSATION PRESSURE CONTROL (MODELS 10-12-16)
The condensation pressure control consists of a pressure switch, which starts and stops the outdoor fan regulating
the condensation temperature, thus the unit will be able to operate in the cooling cycle when the outdoor
temperature is below 19ºC.
HOT GAS BYPASS VALVE
The purpose of the BYPASS valve is to make it possible for the unit to operate at low outdoor temperatures (under
0°C), to be used in cooling-only and head-pump units.
It regulates the capacity of the compressor by injecting hot gas from the compressor discharge side to the
evaporator.
CRANKCASE HEATER (COOLING-ONLY UNITS)
When the unit is operating at low outdoor temperatures it is advisable to fit a crankcase heater.
The purpose of the heater is to keep the oil in the compressor at the correct temperature while the compressor is
stopped so that it can be properly lubricated when started again.
Sound muffler Adapter parts
Anti-rain hood
Outdoor air intake
Air filter

12
2.- INSTALLATION
Wood
block
Securing
screw
If unloading and placement require the use of a
crane, then secure the suspension cables as
shown in the figure.
The unit must be transported in a HORIZONTAL POSITION on its metal bedplate profiles and TRANSPORTATION
BLOCKS. Any other position may cause serious damage to the machine. When the unit is received, it should be
checked to assure that there are no bumps or other damage, following the instructions on the packaging. If there
is damage, the unit may be rejected by notifying the LENNOX Distribution Department and reporting why the
machine is unacceptable on the transport agent’s delivery notice. Any later complaint or claim made to the
LENNOX Distribution Department, for this type of anomaly, cannot be considered under the Guarantee.
Sufficient space must be allowed to facilitate placement of the unit. The unit may be mounted outdoors. There
should be NO possibility of flooding if floor mounted.
2.1.- PRELIMINARY PREPARATIONS
All INSTALLATION, SERVICE and MAINTENANCE operations
must be carried out by QUALIFIED PERSONNEL.
When positioning the unit, be sure that the Rating Plate will always be visible since this
data will be necessary to assure proper maintenance.
The units are designed to be installed with ducts, calculated by qualified technical staff. The joints to be used
between ducts and the openings to the unit should be Elastic Joints. Avoid the use of BYPASS joints between the
extraction air and input air in both the outdoor and indoor sections. The structure where the unit is placed must
be able to support the weight of the unit during operation.
2.2.- UNIT RECEPTION
All the units have Metal Bedplate Profiles and Wooden Blocks for transportation.
These wooden blocks must be removed when positioning the unit in its final position.
To remove the transportation blocks,
remove the screw and slide the block along the metal profile.
PLACEMENT OF THE BEDPLATE
AND TRANSPORTATION BLOCKS
Bedplate profile
Wood
block
How to hoist the unit
Use
separators

13
1) Remove the ceiling of the unit, the Blower Panel with Opening and the Service Panel.
2) Remove the motor-fan assembly from the unit unscrewing the supports from the base, and throwing away the
extension collar, if there is one.
3) Unscrew the supports that have been left on the fan-motor assembly.
4) Turn the fan-motor assembly to its new position 90º horizontally and 180º on its shaft. The motor should now
be accessible from the Service Panel in this new position.
5) Screw down the fan-motor assembly in its new position using the supports.
6) Assemble the Blower Panel with Opening and the Service Panel in its new position, taking special care with the
weather striping.
1) Remove the Intake Opening and the Service Panel.
2) Switch the position of the Opening and Service Panels.
SEE LOCATIONS AND SIZES FOR THE OPENINGS IN THEIR STANDARD AND OPTIONAL
POSITIONS ON THE GENERAL MEASUREMENT DRAWINGS.
Blower Panel
with Opening
Fan-motor assembly
Service
Panel
Intake
Opening
Service
Panel
Extension
Collar
2.- INSTALLATION
2.3.- OPTIONAL OPERATIONS PRIOR TO UNIT INSTALLATION:
CHANGE IN THE POSITION OF BLOWERS AND AIR INTAKE
Motor
Motor
A0
B0
A1
B1
Fan-motor assembly
Service
Panel
Intake
Opening
Blower Panel
with Opening
STANDARD AIR INTAKE AND BLOWERS OPTIONAL AIR INTAKE AND BLOWERS
UNITS MODELS 10-12-16-22
BLOWER:
From the position to the position
A0 A1
INLET:
From the position to the position
B0 B1

14
A0
B0
A1
B1
D'
1) Remove the ceiling of the unit, the Blower Panel with Opening and the Service Panel.
2) Remove the motor-fan assembly from the unit unscrewing the supports from the base, and throwing away the
extension collar, if there is one.
3) Unscrew the supports that have been left on the fan-motor assembly.
4) Turn the fan-motor assembly to its new position 90º horizontally and 180º on its shaft. The motor should now
be accessible from the Service Panel in this new position.
5) Screw down the fan-motor assembly in its new position using the supports.
6) Assemble the Blower Panel with Opening and the Service Panel in its new position, taking special care with the
weather striping.
1) Remove the Intake Opening and the Service Panel.
2) Switch the position of the Opening and Service Panels.
SEE LOCATIONS AND SIZES FOR THE OPENINGS IN THEIR STANDARD AND OPTIONAL
POSITIONS ON THE GENERAL MEASUREMENT DRAWINGS.
2.- INSTALLATION
2.3.- OPTIONAL OPERATIONS PRIOR TO UNIT INSTALLATION:
CHANGE IN THE POSITION OF BLOWERS AND AIR INTAKE
Blower Panel
with Opening
Fan-motor assembly
Service
Panel
Service
Panel
Extension
Collar
Motor
Motor
Fan-motor
assembly
Service
Panel
Intake
Opening
Blower Panel
with Opening
STANDARD AIR INTAKE AND BLOWERS OPTIONAL AIR INTAKE AND BLOWERS
UNITS MODELS 24-28-30
BLOWER:
From the position to the position
A0 A1
INLET:
From the position to the position
B0 B1

15
UNIT INSTALLED ON SHOCK ABSORBERS
Ceiling supports
(shock absorbers)
G POINT: Centre of gravity
TABLE 1:
WEIGHT DISTRIBUTION
AND CENTRE OF
GRAVITY COORDINATES
2.- INSTALLATION
MODELS 10-12-16-22 MODELS 24-28-30
Floor supports
(shock absorbers)
WEIGHT DISTRIBUTION (Kg) CENTRE OF GRAVITY
COORDINATES (G)
(mm.)
Y
X
Y
X
The bedplate is made up of three galvanized metal channels, capable of withstanding the weight of the units
whether hung from the ceiling or mounted on the floor.
If the unit is floor mounted, then the profiles should be isolated with shock absorbing material such as anti-vibration
or pads. If used, consult the weight distribution table below to make the correct selection. Keep in mind that fans
rotate at approximately 850 rpm.
If the unit is hung, M-10 threaded rods should be used along with shock absorbing ceiling supports.
UNIT HUNG WITH RODS
2.4.- UNIT LOCATION AND WEIGHT DISTRIBUTION
XG
Model
Point
10
12
16
22
24
28
30
A B E F Total
40 35 20 40 135
40 45 20 35 140
55 50 35 45 185
55 50 45 50 200
75 70 75 50 270
80 75 75 50 280
80 80 75 50 285
XG
550 340
505 380
570 375
670 425
705 550
660 550
645 550
YG
FAN
Comp.
Coil
BE
A
F
G
YG
BE
A
F
G
XG
YG
FAN
Comp.
Coil

16
Trap
Drain pipe
Clearance around the unit for service and maintenance.
2.- INSTALLATION
2.6.- DRAINS
Consult other options for outdoor mounting or changes in position of the air return duct if the unit
is to be hung.
All heat Pump units have a ¾” steel threaded drain pipe welded to the condensation tray.
One PVC drain trap is supplied with the the heat pump units.
Connect the trap to the drain pipe on the unit and mount the drain pipe with at least a 2% incline from the trap.
Also slightly tip the unit (2%) toward the drainage side. Check that the condensation trays are clean and free from
dirt and other debris from the works and that water drains correctly.
2.5.- INSTALLATION CLEARANCES
1 metro
1 metro
1 metro
1 metro
2%
2%

17
2.- INSTALLATION
2.7.-REFRIGERANT CONNECTIONS
1º Remove the nitrogen gas, through the high and low ¼” service ports locate inside, from both indoor and outdoor
units.
2ª Remove the covers from connecting lines.
3ª Braze the piping connection lines. Refer to installation manual to select the diameter of the lines.
(When brazing refrigerant pipes, is necessary to supply nitrogen gas through the service ports into the pipes to
remove the air)
4º Leak test:
- Add nitrogen gas and check 5 kg/cm2 pressure has been reached, and verify there are not leaks in the circuit
or brazing, applying soapy water on pipes, because the leaks cause soapy water to form bubbles.
To detect small leaks proceed as follow:
Add nitrogen gas and check 32 kg/cm2 pressure has been reached, there is not leak if pressure remain the same
at least during 24 hours and final pressure is not less than 10% from the initial pressure.
5º Be sure gas line is isolated
6º Vacuuming.
Remove the nitrogen gas, connect the gauge manifold and vacuum pump to both liquid and gas line, fully open
the valve of the gauge manifold and switch on the vacuum pump. Check to make sure the gauge shows a pressure
level of –750mm Hg, after a level of –750mm Hg is reached, keep on the vacuum pump at least during an hour.
7º Refrigerant charge
- Refer to installation manual to verify amount and type of refrigerant which must be charged, and the total
amount to be added must be calculated considering the refrigerant charge of the unit, and also the length and sizes
of the refrigerant piping.
- Disconnect the vacuum pump and connect to the refrigerant-charging cylinder. Open the charging cylinder
and purge the air from the hose at the gauge manifold.
- Set up the amount of additional refrigerant on the weighing scale, open the high pressure (liquid) and low
pressure side (suction) of the gauge valve to start the process of refrigerant from outdoor unit. If the total amount
of refrigerant charge have not been reached, because balance pressure, turn off the high side of the gauge manifold,
turn on the unit, and add slowly though low side of the gauge the remain amount of the refrigerant charge needed.
(With R-407C refrigerant, the charging cylinder must be on horizontal position and it is important to charge
in liquid state)
Close the sides of gauge valve from service port of the unit, put the covers on service ports. Then the unit is ready
to work.
The units are supplied with gas and liquid lines sealed with copper covers, and located 60mm from casing
Terminal block
During installation operations, keep gas and liquid pipes covered, in order to provent humidity
and dirt, get into them.
Take special concern about refrigerant pipes are isolated.
Cupper cover
Brazing
60
Service ports
Líquid
Gas
The units are supplied with nitrogen gas, this must be removed
and then proceed as follow:

18
2.- INSTALLATION
2.7.-REFRIGERANT CONNECTIONS
L
OUTDOOR UNIT
INDOOR UNIT
1
2
A
2%
2%
OUTDOOR UNIT INDOOR UNIT
L
B
2%
2
1
OUTDOOR UNIT INDOOR UNIT
L
2
1
C
2%
2%
To locate the outdoor and the indoor units, refer to the following information:
A,B,C : Unit positions
L : Total length
1 = Gas line
2 = Líquid line
- THE GAS LINE ALWAYS MUST BE INSULATED
- THE HORIZONTAL LINES MUST BE TIPED AT LEAST 2% TOWARD THE OUTDOOR UNIT
- THE MAXIMUM SPEED INSIDE LINES, NOT SHOULD BE MORE THAN 15 m/seg.
UNIT - MODEL
Líquid
Total line length
0 to 10 m. Gas
10 to 30 m. 5/8"
11/8"
5/8''
11/8"
3/4''
13/8"
5/8"3/8" 3/8" 5/8"
7/8"
Gas
Líquid
7/8"7/8" 11/8"
24 28 302210 12 16
30 to 50 m.
11/8"7/8"
Gas
Líquid 1/2" 1/2" 5/8" 5/8" 3/4'' 3/4'' 3/4''
7/8" 11/8" 13/8" 13/8" 13/8"
Unit connections Líquid
5/8"
11/8"
5/8''
11/8"
5/8''
11/8"
5/8"
7/8"
3/8"
3/4"
3/8"
3/4"
1/2"
7/8"
5/8" 5/8'' 5/8''5/8"3/8" 3/8" 1/2"
REFRIGERANT LINES
Gas 11/8" 11/8" 11/8"7/8"3/4" 3/4" 7/8"
15 15 15 15 15 15 15
Maximum vertical line length (m.)
POSITION A: A syphon suction must be installed on the vertical line of the gas line, and syphons must be
installed every 8 meters upward.
POSITION B: Tip the lines toward the outdoor unit. Make special atention to line length longer than 10m
POSITION C: Install a syphon at the base of the vertical line, no more syphons are necessary.
TABLE 2: REFRIGERANT LINES SELECTION
12 12 12 12 12 12 12
Maximum number of bends
For other positions and lines lengths between 30 and 50m or longer , consult the commercial
- technical department, the following data will be obtained from that estimation.
Pipe dimensions, Syphon suction, Isolations, Refrigerant load, Line lengths

19
2.- INSTALLATION
2.7.-REFRIGERANT CONNECTIONS
If R-407C Refrigerant is used in the unit, the following precautions characteristic of this gas should
be taken:
- The Vacuum Pump must have a Check Valve or Solenoid Valve.
- Pressure Gauges and Hoses for the exclusive use with R-407C Refrigerant should be used.
- The charge should be carried out in the Liquid Phase.
- Always use scales to weight-in charge- Use the Leak Detector exclusive for R-407C Refrigerant.
- Do not use mineral oil, nonly ynthetic oil to ream, expand or make connections.
- Keep pipes wcappedbefore using them and be very thorough about any possible dirt (dust, filings,
burrs, etc.).
- When there is a leak, gather what is left of the charge, create a vacuum in the unit and completely
recharge with new R-407C Refrigerant.
- WBrazingshould always be carried out in a nitrogen atmosphere.
- Reamers should always be well sharpened.
PRECAUTIONS TO BE TAKEN IN THE USE OF R-407C Refrigerant

20
TABLE 4: CHARGE OF REFRIGERANT FOR OUTDOOR UNIT + INDOOR UNIT LF
CHARGE OF REFRIGERANT FOR THE SET:
EXAMPLE:
To install a KFHK 16 + LFXO 16 set, with a 22m refrigerant line lenght between outdoor and indoor unit, then the
refrigerant charge must be calculated as follow:
1º Type of refrigerant R-22 or R-407C, in this case, R-407C .
2º The TABLE 2 shows, that for 22m of line legth between indoor unit and outdoor unit, the line sizes are, liquid
5/8", and gas 7/8".
3º TABLE 3 shows, for line sizes of 5/8"-7/8", the charge per meter line is: 150 gr/m.
4º TABLE 4 shows, charge of refrigerant for the set with 0m of line leght is 4000gr.
5º To determinate the charge of the set:
Add charge of the refrigerant lines + charge of refrigerant indoor unit and outdoor unit
MODEL 10
MODEL 12
MODEL 16
MODEL 22
MODEL 24
MODEL 28
MODEL 30
Total charge for the set: (150 gr/m) x 22m + 4.000 gr = 4.300 gr
2.- INSTALLATION
KFHA 12
+
LFXO 12
KFHA 10
+
LFXO 10
KFHA 16
+
LFXO 16
KFHA 22
+
LFHA 22
KFHA 24
+
LFHA 24
KFHA 28
+
LFHA 28
KFHA 30
+
LFHA 30
KFCK 12
+
LFXO 12
KFCK 10
+
LFXO 10
KFCK 16
+
LFXO 16
KFCK 22
+
LFCK 22
KFCK 24
+
LFCK 24
KFCK 30
+
LFCK 30
KFCK 28
+
LFCK 28
Charge of refrigerant R-22
for 0 meters of line.
2.240 2.560 3.550 5.000 --- 7.000---
KFHK 12
+
LFXO 12
KFHK 10
+
LFXO 10
KFHK 16
+
LFXO 16
KFHK 22
+
LFHK 22
KFHK 24
+
LFHK 24
KFHK 30
+
LFHK 30
KFHK 28
+
LFHK 28
2.620 2.920 4.000 5.500 7.500 8.2008.000
2.7.-REFRIGERANT CONNECTIONS
Charge of refrigerant R-407C
for 0 meters of line.
Charge of refrigerant R-407C
for 0 meters of line.
TABLE 3: WEIGHT OF REFRIGERANT PER METER LINE
FROM 0 TO 10M FROM 10 TO 30M FROM 30 TO 50M
gr/m gr/m gr/m
3/8"
1/2"
5/8"
3/4"
7/8"
1-1/8"
50
50
95
150
155
155
155
3/4"
7/8"
1-1/8"
1-1/8"
3/8"
5/8"
5/8"
5/8"
3/8"
5/8"
7/8"
1-1/8"
50
50
150
155
155
155
235
1-1/8"
1-3/8"
3/8"
5/8"
5/8"
1/2"
5/8"
1-1/8"
95
95
155
155
235
235
235
1-1/8"
5/8"
1-1/8"
7/8"
7/8"
3/4"
5/8"
7/8"
7/8"
1-3/8"
1-3/8"
1-3/8"
1/2"
3/4"
3/4"
3/4"
Suction Liquid Suction Liquid Suction Liquid
UNIT MODELS
gr.
2.900 3.100 3.900 5.400 8.400 8.7008.600
gr.
gr.
UNIT MODELS
UNIT MODELS