Lennox FLEXY FC 050 Series User manual

INSTALLATION -
OPERATING &
MAINTENANCE MANUEL
ROOFTOP
FLEXY

IOM / ROOF-TOP FLEXY™ Series - Page 1
CONTENTS
TRANSPORT - HANDLING - INSTALLATION-COMMISSIONING
TRANSPORT - HANDLING.................................................................................................... 3
INSTALLATION ...................................................................................................................... 6
INSTALLATION ON ROOF MOUNTING FRAME................................................................... 7
INSTALLATION ON CORNER SUPPORT POSTS ................................................................ 9
COMMISSIONING................................................................................................................ 10
OPERATION
AIR FLOW BALANCING ...................................................................................................... 11
AIRFLOW BALANCING - FXA/FXK .................................................................................... 20
FILTERS ............................................................................................................................... 21
HOT WATER BATTERIES ................................................................................................... 22
GAS BURNERS ................................................................................................................... 23
BELT TENSIONING ............................................................................................................. 30
PULLEYS ............................................................................................................................. 31
CONTROL FUNCTIONS
USING THE KP 17 COMFORT DISPLAY ............................................................................ 32
USING THE KP02 MAINTENANCE DISPLAY ..................................................................... 33
USING THE KP07 REMOTE GRAPHICAL DISPLAY .......................................................... 42
BMS CONTACTS KIT........................................................................................................... 51
CLIMATIC™ PARAMETERS ................................................................................................ 52
WIRING DIAGRAMS
ELECTRICAL WIRING DIAGRAMS..................................................................................... 59
ELECTRICAL WIRING DIAGRAMS LIST OF ITEMS .......................................................... 69
TROUBLESHOOTING
FAULT CODES.....................................................................................................................70
BEFORE CALLING FOR ASSISTANCE .............................................................................. 76
PLANNED MAINTENANCE ................................................................................................. 78
WARRANTY ......................................................................................................................... 81
CERTIFICATS
CE CERTIFICATION OF CONFORMITY ............................................................................. 82
FILTERS FIRE CLASS ......................................................................................................... 83
33 KW GAS BURNER CE CERTIFICATION OF CONFORMITY ........................................ 86
60 KW GAS BURNER CE CERTIFICATION OF CONFORMITY ........................................ 87
120 KW GAS BURNER CE CERTIFICATION OF CONFORMITY ...................................... 88
CE DAD CERTIFICATION.................................................................................................... 89
INSULATION FIRE CLASS .................................................................................................. 91
The present manual applies to the following ROOFTOP versions :
FCA 50 - FCA 60 - FCA 70 - FCA 85 - FCA 100 - FCA 120 - FCA 140 - FCA 160 - FCA 190
FCK 50 - FCK 60 - FCK 70 - FCK 85 - FCK 100 - FCK 120 - FCK 140 - FCK 160 - FCK 190
FHA 50 - FHA 60 - FHA 70 - FHA 85 - FHA 100 - FHA 120 - FHA 140 - FHA 160 - FHA 190
FHK 50 - FHK 60 - FHK 70 - FHK 85 - FHK 100 - FHK 120 - FHK 140 - FHK 160 - FHK 190
FDA 50 - FDA 60 - FDA 70 - FDA 85 - FDA 100 - FDA 120 - FDA 140 - FDA 160 - FDA 190
FDK 50 - FDK 60 - FDK 70 - FDK 85 - FDK 100 - FDK 120 - FDK 140 - FDK 160 - FDK 190
FGA 50 - FGA 60 - FGA 70 - FGA 85 - FGA 100 - FGA 120 - FGA 140 - FGA 160 - FGA 190
FGK 50 - FGK 60 - FGK 70 - FGK 85 - FGK 100 - FGK 120 - FGK 140 - FGK 160 - FGK 190
FXA 25 - FXA 30 - FXA 35 - FXA 40 - FXA 55 - FXA 70 - FXA 85 - FXA 100 - FXA 110 - FXA 140 - FXA 170
FXK 25 - FXK 30 - FXK 35 - FXK 40 - FXK 55 - FXK 70 - FXK 85 - FXK 100 - FXK 110 - FXK 140 - FXK 170
The technical information and specifications contained in this manual are for reference only. The manufacturer reserves the right to modify these without
warning and without obligation to modify equipment already sold.
Ref. IOM-RT F-09-00-E
IOM MANUAL

Page 2 - IOM / ROOF-TOP FLEXY™ Series

IOM / ROOF-TOP FLEXY™ Series - Page 3
TRTR
TRTR
TRANSPORT - HANDLINGANSPORT - HANDLING
ANSPORT - HANDLINGANSPORT - HANDLING
ANSPORT - HANDLING
DELIVERY CHECKS
The equipment is shipped at the customers risk, and
whose responsiblity it is to ensure that the products
are in good working order on receipt by checking the
following:
- The exterior has not been damaged in any way.
- The lifting and handling equipment are suitable
for the equipment and comply with the
specifications of the handling instructions
enclosed herein.
- Accessories ordered for on site installation have
been delivered and are in good working order.
- The equipment supplied corresponds with the
order and matches the delivery note.
If the product is damaged, exact details must be
confirmed in writing by registered post to the shipping
company within 48 hours of delivery (working days). A
copy of the letter must be addressed to Lennox and
the supplier or distributor for information purposes.
Failure to comply will invalidate any claim against the
shippingcompany.
RATING PLATE
The rating plate provides a complete reference for the
model and ensures that the unit corresponds to the
model ordered. It states the electrical power
consumption of the unit on start-up, its rated power
and its supply voltage. The supply voltage must not
deviate beyond +10/-15 %.
The start-up power is the maximum value likely to be
achieved for the specified operational voltage. The
customer must have a suitable electrical supply. It is
thereforeimportanttocheckwhetherthesupplyvoltage
stated on the unit's rating plate is compatible with that
of the mains electrical supply.
The rating plate also states the year of manufacture
aswell as thetype of refrigerantused with therequired
volume capacity of each compressor circuit.
STORAGE
When units are delivered on site they are not always
required immediately and are sometimes put into
storage. In the event of medium to long-term storage,
we recommend the following procedures:
- Ensure that there is no water in the hydraulic
systems.
- Keep the heat exchanger covers in position
(AKILUX cover).
- Keep protective plastic film in position.
- Ensure the electrical panels are closed.
- Keep all items and options supplied in a dry and
clean place for future assembly before using the
equipment.
MAINTENANCE KEY
Ondeliverywerecommendthatyoukeepthekeywhich
isattached to aneyebolt inasafe andaccesible place.
This allows you to open the panels for maintenance
and installation work.
The locks are ¼ turn + then tighter (Figure 2).
Figure 2
Figure 1
N˚ SERIE
SERIAL NUMBER
TYPE
UNITTYPE
Usine Dijon
Z.I. LONGVIC
21600 LONGVIC
FRANCE
ANNEE
YEAR
ALIMENTATION
ELEC. SUPPLY
A. MAXI
MAX. AMP.
REFRIGERANT
FLUIDE Kg/CIRC
C1 C3C2 C4
I. DEMARR.
START UP AMP.
C. COMMANDE.
CONTROL CIR.
V
V
A
Hz
FCK 190
2000
215 900-01/01
400 3 50
140 269 24
111111 11
R407C

Page 4 - IOM / ROOF-TOP FLEXY™ Series
Model Length Rain Cover Width Height Weight Sling Length
(1) (2)
FC*/FH* 050 downflow 2150 - 1780 1090 750 2000
FC*/FH* 050 upflow 2150 - 1780 1120 750 2000
FC*/FH* 050 horizontal flow 2150 - 1780 1120 750 2000
FGA/FDA/FGK/FDK 050 2200 - 1900 1090 850 2000
FC*/FH* 060 downflow 2821 629 2254 1410 1000 2500
FC*/FH* 060 upflow 2821 629 2254 1410 1000 2500
FC*/FH* 060 side discharge 2821 629 2254 1410 1000 2500
FC*/FH* 060 centrif. condensing fan 2821 629 2254 2000 1100 2100
FGA/FDA/FGK/FDK 060 2821 629 2254 1410 1100 2500
FC*/FH* 070 downflow 2821 629 2254 1410 1000 2500
FC*/FH* 070 upflow 2821 629 2254 1410 1000 2500
FC*/FH* 070 side discharge 2821 629 2254 1410 1000 2500
FC*/FH* 070 centrif. condensing fan. 2821 629 2254 2000 1100 2100
FGA/FDA/FGK/FDK 070 2821 629 2254 1410 1150 2500
FC*/FH* 085 downflow 3781 629 2254 1495 1200 2100
FC*/FH* 085 upflow 3781 629 2254 1495 1200 2100
FC*/FH* 085 side discharge 3781 629 2254 1495 1200 2100
FC*/FH* 085 centrif. condensing fan. 3782 629 2254 2010 1430 3400 3100
FGA/FDA/FGK/FDK 085 2821 629 2254 1495 1300 2100
FC*/FH* 100 downflow 3781 629 2254 1495 1200 2100
FC*/FH* 100 upflow 3781 629 2254 1495 1200 2100
FC*/FH* 100 side discharge 3781 629 2254 1495 1200 2100
FC*/FH* 100 centrif. condensing fan. 3782 629 2254 2010 1430 3400 3100
FGA/FDA/FGK/FDK 100 2821 629 2254 1495 1480 2100
FC*/FH* 120 downflow 3582 629 2254 1410 1500 3000
FC*/FH* 120 upflow 3582 629 2254 1410 1500 3000
FC*/FH* 120 side discharge 3582 629 2254 1410 1500 3000
FC*/FH* 120 centrif. condensing fan. 3582 629 2254 1910 1550 3300 3000
FGA/FDA/FGK/FDK 120 4030 629 2254 1410 1750 3200
FC*/FH* 140 downflow 3582 629 2254 1410 1600 3000
FC*/FH* 140 upflow 3582 629 2254 1410 1600 3000
FC*/FH* 140 side discharge 3582 629 2254 1410 1600 3000
FC*/FH* 140 centrif. condensing fan. 3582 629 2254 1910 1650 3300 3000
FGA/FDA/FGK/FDK 140 4030 629 2254 1410 1950 3200
FC*/FH* 160 downflow 3590 900 2254 2050 2000 3000
FC*/FH* 160 upflow 3590 900 2254 2050 2000 3000
FC*/FH* 160 side discharge 3590 900 2254 2050 2000 3000
FC*/FH* 160 centrif. condensing fan. 3590 900 2254 2050 2150 3000 3000
FGA/FDA/FGK/FDK 160 4040 900 2254 2050 2500 3300
FC*/FH* 190 downflow 3590 900 2254 2050 2250 3000
FC*/FH* 190 upflow 3590 900 2254 2050 2250 3000
FC*/FH* 190 side discharge 3590 900 2254 2050 2250 3000
FC*/FH* 190 centrif. condensing fan. 3590 900 2254 2050 2350 3000
FGA/FDA/FGK/FDK 190 4040 900 2254 2050 2750 3300
TRTR
TRTR
TRANSPORT - HANDLINGANSPORT - HANDLING
ANSPORT - HANDLINGANSPORT - HANDLING
ANSPORT - HANDLING
DIMENSIONS AND WEIGHTS

IOM / ROOF-TOP FLEXY™ Series - Page 5
TRTR
TRTR
TRANSPORT - HANDLINGANSPORT - HANDLING
ANSPORT - HANDLINGANSPORT - HANDLING
ANSPORT - HANDLING
Model Length Side Ventil. Width Height Weight Sling
louver louver Length
FX* 25 4070 490 600 1633 1055 950 3000
FX* 30 4070 490 600 1633 1055 980 3000
FX* 35 4750 490 600 2254 1290 1400 3700
FX* 40 4750 490 600 2254 1290 1450 3700
FX* 55 4750 490 600 2254 1290 1600 3700
FX* 70 5050 890 600 2254 1725 1800 3900
FX* 85 5050 890 600 2254 1725 1900 3900
FX* 100 5050 890 600 2254 1725 2000 3900
FX* 110 5650 860 2254 2000 2300 4300
FX* 140 5650 860 2254 2000 2400 4300
FX* 170 5650 860 2254 2000 2600 4300
Figure 3
1
FC*/FH*/FG*/FD* 60-70
with centrifugal condenser fan
1
2
FC*/FH*/FG*/FD* 85 / 160
with centrifugal condenser fan
1
1
FC*/FH*/FG*/FD*
1
FX*
HANDLING
The equipment can be moved using the lifting hooks
on the top of the unit.
The dimension specified in the "sling" column is the
sling length that we recommend for safe handling of
the equipment.
Some units can only be supported by four slings at
right-angles. Others require different lengths (see
Figure 3).
Itis essentialthat all liftinghooks areusedand thatthe
slings are all of the same size to avoid damaging the
equipment.

Page 6 - IOM / ROOF-TOP FLEXY™ Series
PRELIMINARY CHECK
Before installing the equipment, the following items
MUST be checked:
- Is there sufficient space for the equipment?
- Is the surface on which the equipment will be
placed sufficiently solid to withstand its weight? A
detailed study of the frame must be made
beforehand.
- Do the supply and return ductwork openings
excessively weaken the structure?
- Are there any obstructing items which could
hinder the operation of the equipment?
- Does the electrical power available correspond to
the equipment's electrical specifications?
- Does the noise level of the equipment meet the
specification ?
- Is drainage provided for the condensate?
- Is there sufficient access for maintenance?
- Installation of the equipment could require
different lifting methods which may vary with
each installation (helicopter or crane). Have these
been evaluated ?
Ingeneral,make surenoobstacles (walls, treesorroof
ledges) are obstructing the duct connections or
hindering assembly and maintenance access.
INSINS
INSINS
INSTT
TT
TALLAALLA
ALLAALLA
ALLATIONTION
TIONTION
TION
CONNECTIONS DEVICE
- Ensure that all the pipework crossing walls or
roofs are insulated and secure.
- To avoid condensation problems, be sure all
pipes are insulated according to temperatures of
fluids and type of rooms.
NOTE : The AQUILUX covers which protect the finned
surfacesmustbe removed priortounit commissioning.
Figure 4
MODELS ABCD
FC/FH/FG/FD
50 1000 1000 1000 2000
60 è140 1400 1000 1400 2300
160 & 190 2000 1000 2000 2300
FX
25 & 30 * 1100 * 1700
35 è55 * 1300 * 2300
70 è100 * 1700 * 2300
110 è170 * 2000 * 2300
* : according to connection
INSTALLATION DEVICE
The surface on which the equipment is to be installed
must be clean and free of any obstacles which could
hinder the flow of air to the condensers:
- Avoid uneven surfaces
- Avoid installing two units side by side or close to
each other as this may restrict the airflow to the
condensers.
Beforeinstalling apackaged rooftop unitit isimportant
to understand:-
- The direction and position of air flows.
- The external dimensions of the unit and the
dimensions of the supply and return air connec-
tions.
- The arrangement of the doors and the space
required to open them to access the various
components.
Figure 4 shows the required clearances and
dimensions.

IOM / ROOF-TOP FLEXY™ Series - Page 7
2
INSINS
INSINS
INSTT
TT
TALLAALLA
ALLAALLA
ALLATION ON A ROOFMOUNTING FRTION ON A ROOFMOUNTING FR
TION ON A ROOFMOUNTING FRTION ON A ROOFMOUNTING FR
TION ON A ROOFMOUNTING FRAMEAME
AMEAME
AME
As levels are adjustable, observe the following
recommendations for correct installation of the
equipment.
Above all, ensure that all the flaps are facing
outward (1 - Figure 5).
They are sometimes stored inside for transport.
Place the roof mounting frame on the trimmer
beamby firstlining up theinlet andthenthe outlet.
(2 - Figure 6).
After levelling the frame, fix the surface flaps onto
the trimmer.
1
Figure 5
Figure 6
Figure 7

Page 8 - IOM / ROOF-TOP FLEXY™ Series
INSINS
INSINS
INSTT
TT
TALLAALLA
ALLAALLA
ALLATION ON A ROOFMOUNTING FRTION ON A ROOFMOUNTING FR
TION ON A ROOFMOUNTING FRTION ON A ROOFMOUNTING FR
TION ON A ROOFMOUNTING FRAMEAME
AMEAME
AME
When the frame is correctly positioned, it is essential to secure the assembly with a disconnected welding seam
(20 to 30 mm for every 200 mm) along the outside, or by using an alternative method (1 - Figure 8).
Assembly joint (1 - Figure 9)
Insulate the frame before installation. We recommend
the minimum application of 20 mm thick insulation.
Check that the covering is continuous and apply a
seal (2 - Figure 9).
CAUTION : To be effective, the upstream must end
below the drop edge (3 - Figure 9)
Beforeinstalling theequipment, make surethat theassemblyseal orthe puttying isnot damagedand check that
the unit is fixed to the mounting frame so that it is resting flat on the frame.Once in position, the bottom of the
equipment must be horizontal.
The installer must comply to local authority standards and specifications.
1
2
3
Figure 4
1
Figure 8

IOM / ROOF-TOP FLEXY™ Series - Page 9
INSINS
INSINS
INSTT
TT
TALLAALLA
ALLAALLA
ALLATION ON POSTION ON POS
TION ON POSTION ON POS
TION ON POSTSTS
TSTS
TS
The unit can be fitted on corner posts using the frame provided. The minimum height of the posts should be
400mm.
Figure 10

Page 10 - IOM / ROOF-TOP FLEXY™ Series
This work must only be carried out by trained
refrigeration engineers
Before connecting to the power:
- Ensure that the power supply between the
building and the unit meets local authority stan-
dards and that the cable specification satisfies the
start-up and operating conditions.
- Ensure that the electrical connections in the
control panel and on the motors are secure.
- Ensure that all drive motors are secure.
- Ensure that the adjustable pulley blocks are
secure and that the belt is tensioned with the
transmission correctly aligned.
- Using the electrical wiring diagram, check the
conformity of the electrical safety devices (circuit
breaker settings, presence and rating of fuses).
At this point attach the manometers to the refrigerant
circuit
Powering up the system with the unit isolating
switch
- Check the direction of rotation of the fans by
pressing their contactors. Refer to the rotation
arrows situated next to the coils or fans (NOTE:
unlike a coil, a fan rotating in the wrong direction
may fail).
- The fans' direction of rotation is checked during
an end of production test. They should therefore
all turn in either the right or wrong direction.
- If they turn in the opposite direction, disconnect
the power supply to the machine at the building's
mains switch, reverse two phases of the incoming
supply to the machine and try again.
- If only one of the fans rotates in the wrong direc-
tion, disconnect the power supply at the
machine's isolating switch and reverse two of the
component initial phases on the terminal within
the electrical panel.
Using CLIMATIC™ (06 to ON for KP02).
- Check the voltages recorded against the rated
values, in particular on the system supply fans.
- If the readings on the fans are outside the limits,
this indicates excessive air flow which will affect
the thermodynamic performance. Refer to the "Air
Flow Balancing" section.
Thermodynamic readings using manometers and
prevailing environmental conditions
- No rated values are given here. These depend on
the climatic conditions both outside and inside
the building during operation. However, an
experienced refrigeration engineer will be able to
detect any abnormal machine operation.
COMMISSIONINGCOMMISSIONING
COMMISSIONINGCOMMISSIONING
COMMISSIONING
Safety Test
- "Clogged filter" detection test: vary the threshold
value (C89 for the KP02) in respect to the air
pressure value (V16 for KP02). Observe the
response of the CLIMATIC.
- Same procedure for detecting "Missing Filter"
(C90) or "Air Flow Detection" (C88).
- Check the smoke detection function.
- Check the Firestat by pressing the test button.
- Disconnect the circuit breakers of the capacitor
fans and check the high pressure cut-out points
on different refrigerant circuits.
Reverse Cycle Test
On reversible units this test is used to check the
switching of the 4-way valves. Start the reverse cycle
withreference tothe cold orhot temperaturethreshold
data according to the climatic conditions at the time of
testing (C15 or C16).
Your machine is now operational.
You can now proceed to the setting stage. See the
"Control" section.

IOM / ROOF-TOP FLEXY™ Series - Page 11
AIR FLOW BALANCINGAIR FLOW BALANCING
AIR FLOW BALANCINGAIR FLOW BALANCING
AIR FLOW BALANCING
Theactualresistanceofductworksystemsisnotalways
thesameasthecalculatedtheoreticalvalues. To rectify
this, it may be necessary to modify the pulley and belt
setting.Tothiseffect, the motorsarefittedwith variable
pulleys.
TEST
You should already have measured the + ve pressure
experienced on fan discharge, as well as the pressure
experienced in the return duct to the fan.
Measure the motor absorbed power.
Iftheabsorbedpower is greaterandthepressurelower
thantheratedvalues,yoursystemhasalowerpressure
drop than anticipated. Reduce the flow. If the system
resistence is significantly lower than design, there is a
risk that the motor will overheat resulting in an
emergency cut out.
Iftheabsorbedpower is lowerandthepressuregreater
than the rated values, your system has a higher
pressure drop than anticipated. Increase the flow. At
the same time you will increase the absorbed power
which may result in having to fit a larger motor.
To carry out the adjustment and to avoid a time-
consumingre-start, stop themachine andifnecessary
lock the main switch.
First unscrew the 4 Allen screw(s) on the pulley (see
Figure 11).
Slacken the belts, then remove then (see § "BELT
TENSION").
Figure 12
Theflow can nowbeincreased byturningthe flange(s)
tomove them closer(oralternatively, movethemapart
to reduce the flow).
For two-groove pulleys, turn the flanges the same
number of turns.
If necessary, check the pulley diameter by measuring
the outer diameter of a belt positioned in the groove
(Figure 12).
Finally, replace and tension the belts before carrying
outatest.Re-checktheabsorbedpowerlevels. Repeat
the operation until a satisfactory result has been
achieved.
Tominimise the numberof operations, referto the flow
/pressure chartson thefollowing pages for the typeof
fans used. With reference to the following example,
you can estimate your flow and thus calculate the
necessary adjustment.
ALLEN wrench 4
Figure 11

Page 12 - IOM / ROOF-TOP FLEXY™ Series
UNIT/FAN KIT REFERENCE TABLE
Size Fan type A B C D E F
50 FCx or FHx 1
FGx or FDx 1
60 FCx or FHx 1
Centrifugal condensor 1 (*)
FGx or FDx 2
70 FCx or FHx 1
Centrifugal condensor 1 (*)
FGx or FDx 2
85 FCx or standard FHx 1 (*)
FCx or side FHx 2
Centrifugal condensor 2
FGx or FDx 2
100 FCx or standard FHx 1 (*)
FCx or side FHx 2
Centrifugal condensor 2
FGx or FDx 2
120 FCx or standard FHx 2
FCx or side FHx 2
Centrifugal condensor 2 (*)
FGx or FDx 2
140 FCx or standard FHx 2
FCx or side FHx 2
Centrifugal condensor 2 (*)
FGx or FDx 2
160 FCx or standard FHx 2
Centrifugal condensor 4
FGx or FDx 2
190 FCx or standard FHx 2
Centrifugal condensor 4
FGx or FDx 2
ROOF-TOP type FX*
Size Fan type A B C D E F
25 Supply 1
Extract 1
30 Supply 1
Extract 1
35 Supply 1
Extract 1
40 Supply 1
Extract 1
55 Supply 1
Extract 1
70 Supply 1
Extract 1
85 Supply 1
Extract 1
100 Supply 1
Extract 1 (*)
110 Supply 2
Extract 2
140 Supply 2
Extract 2
170 Supply 2
Extract 2
The number indicated in the table refers to the number of fans.
1(*) : In this case the two fans are coupled to the same shaft.
2(*) : Indicates that there are 2 groups of 2 coupled fans.
AIR FLOW BALANCINGAIR FLOW BALANCING
AIR FLOW BALANCINGAIR FLOW BALANCING
AIR FLOW BALANCING

IOM / ROOF-TOP FLEXY™ Series - Page 13
AIR FLOW BALANCINGAIR FLOW BALANCING
AIR FLOW BALANCINGAIR FLOW BALANCING
AIR FLOW BALANCING
EXAMPLE :
You may want to adjust a FHK 120 set to 22 000 m3/h with a system resistance of 150Pa:
The machine has 2 fans (chart D).
Forthis operating point,the unitsuppliedis fittedwith E kitscomprising 112 mm- 131mmvariable pulleyson the
motors and 250 mm pulleys on the fans.
In this case the pulley motor adjustment is 126 mm for a fan speed of 730 rpm.
On the chart, for 11 000 m3/h (2 fans), indicates 730 rpm (point A).
• Total pressure 500 Pa
(150 Pa system pressure + 230 Pa equipment loss + 120 Pa static pressure)
• Absorbed power 2.1 kW, which gives 5.7 A, calculated as follows:
In = (P.kw x Ct / Rm ) / ( 3 x U x cos f) = ( 2100 * 1.2 / 0.8 ) / ( 3 x 400 x 0.8 ) = 5.7A
Motor output
Transmission coefficient
On site you measure:
• System static pressure 70 Pa or total pressure 230 Pa
(the pressure must be measured after 1 m minimun on the return ductwork)
• Absorbed power 6.8A
The theoretical absorbed power will be : P = ( 3 x 400 x 6.8 x 0.8 ) / 0.8(Rm) x 1.2(Ct) = 2,500 W
With reference to the chart data, the operating point B has been highlighted as we note that: the system is exceeding
design airflow rates. 12 700 m3/h and 25 400 m3/h can be read for the two fans instead of the 22,000 m3/h specified.
Toreturn tothe design flow, considerpoint C,whichnow givesa rotation speedof 650rpm, i.e. avariable pulley
adjustment of :
Adjustment = fan speed / motor speed * pulley diameter = 650 / 1450 * 250 = 112 mm.
Alternatively, where there is reduced airflow, i.e.caused by a greater system resistance than anticipated (items
B’ and C’), follow the same procedure, but in this case ensure that the absorbed power at C' is compatible with
the motor fitted.
730tr/mn
2.7kW
12700m3/h
A
B
B'
C
C'
P
ression statique mesurée
Pression statique demandée
Pression totale mesurée
650tr/mn
2.1kW
11500m3/h
Pression dynamique
Pression statique mesurée
Pression statique demandée
Pression totale mesurée

Page 14 - IOM / ROOF-TOP FLEXY™ Series
AIR FLOW BALANCINGAIR FLOW BALANCING
AIR FLOW BALANCINGAIR FLOW BALANCING
AIR FLOW BALANCING
CHART A

IOM / ROOF-TOP FLEXY™ Series - Page 15
REGLAGE DU DEBIT D'REGLAGE DU DEBIT D'
REGLAGE DU DEBIT D'REGLAGE DU DEBIT D'
REGLAGE DU DEBIT D'AIRAIR
AIRAIR
AIR
CHART B

Page 16 - IOM / ROOF-TOP FLEXY™ Series
AIR FLOW BALANCINGAIR FLOW BALANCING
AIR FLOW BALANCINGAIR FLOW BALANCING
AIR FLOW BALANCING
CHART C

IOM / ROOF-TOP FLEXY™ Series - Page 17
AIR FLOW BALANCINGAIR FLOW BALANCING
AIR FLOW BALANCINGAIR FLOW BALANCING
AIR FLOW BALANCING
CHART D

Page 18 - IOM / ROOF-TOP FLEXY™ Series
AIR FLOW BALANCINGAIR FLOW BALANCING
AIR FLOW BALANCINGAIR FLOW BALANCING
AIR FLOW BALANCING
CHART E

IOM / ROOF-TOP FLEXY™ Series - Page 19
AIR FLOW BALANCINGAIR FLOW BALANCING
AIR FLOW BALANCINGAIR FLOW BALANCING
AIR FLOW BALANCING
CHART F