Lennox CL50-RoofTop, CLIMATIC 50 Maintenance Manual

Providing indoor climate comfort

CLIMATIC™ 50

ROOFTOP & AIRCOOLAIR

CL50-ROOFTOP-IOM-1107-E

User manual

CLIMATIC™50 – IOM – Rooftops/ Aircoolair CL50-ROOFTOPS-IOM-1107-E

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Climatic 50
Roof-Top & Aircoolair

INSTALLATION
OPERATING &
MAINTENANCE MANUAL

Ref : CL50-RoofTop-IOM-1107-E

LENNOX have been providing environmental solutions since 1895, our range of Baltic TM rooftop contin ues 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 becomes a standard. Further Information on
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 used (except in operation of this product), reproduced,
issued to or made available to third parts without the prior written agreement of Lennox.

The technical informations 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.

CLIMATIC™50 – IOM – Rooftops/ Aircoolair CL50-ROOFTOPS-IOM-1107-E

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TABLE OF CONTENTS

Page

INTRODUCTION 3
CONNECTION 4
CONFIGURATION 8
SCHEDULING – CLOCK SETTING 10

VENTILATION 13
THERMOSTAT / HYGROSTAT – SET POINTS 15
THERMOSTAT / HYGROSTAT – CONTROL PRINCIPLE 17
FRESH AIR DAMPER - FREE-COOLING 18
COMPRESSORS 20
DEFROST – HEAT PUMP 22
SUPPLEMENT OF HEATING (OPTION) 23
CUSTOMIZED INPUT/OUTPUT 25

FAULT CODES

Insufficient airflow 28
Filters Clogged or Missing 29
Ambient Temperature and Humidity, Outside Limits 30
Blowing temperature, outside limits 31
Overheating of Electrical Heating Elements 32
Gas Burner Faults 33
External Humidifier fault 34
Hot Water Circulator Fault 34
Fault in Real Time Clock 35
Extension card fault (BE50) 35
Faulty Probes and Sensors 36
Blowing fan 37
Condenser fans 38
Water Condenser Faults 39
Smoke Detector 40
Compressors shut down on LP cut off 41
Compressor shut down onHP cut off or electrical protection 42

COMMUNICATION 43

MASTER/SLAVE 43
BMS 45

CONFIGURING THE BM50 PLAN ADDRESS 46
ALLOCATION OF DISPLAYS TO THE BM50 47
DC50 COMFORT & DM50 MULTI CUSTOMER DISPLAY 48
DS50 SERVICE DISPLAY 53

DS50 MENU TREE 59
CLIMATIC™50 INPUT/OUTPUT MAPPING 67

MODBUS, LONTALK ADRESS TABLES 70

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INTRODUCTION

CLIMATIC™50

The new generation of microprocessor based control, CLIMATICTM 50 may be fitted to the Lennox Roof-Top or
AirCooler range. It inherits 20 years of technology and field operating experience from its predecessors the
CLIMATICTM1 and CLIMATICTM 2.
LENNOX has found the latest hardware technology available on the market place and developed a software
specifically designed for Roof-Top and AirCooler applications, maximising the LENNOX units efficiency and
performance.

Compatibility

This documentation is compatible with the programs Roof Top and AirCooler:

• Ranges Baltic, Flexy I, Flexy II, FX and AC, starting from the version 20.0

Warning

Any parameter modification should be carried out by trained and licensed competent technician.
Before start-up or restart of a unit controlled by Climatic 50, it is mandatory to check adequacy between

Climatic 50 and the unit with its options.

• 38xx menus for unit and options

• 39xx menux for communication

In case of wrong parameters, I/O links could be incorrect and may create some operation problems for
the units and ultimately breakdowns.
Lennox cannot be held responsible for any claims on the units due to a wrong parameters sequence or a
parameters modification carried out by non competent technicians. In this case, the warranty will be
legally null and void.

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WIRING CONNECTIONS

IMPORTANT WARNING

Any wiring modification on the CLIMATIC 50 must be done by Lennox technician or employees having valid
electrical qualification and authorisation.

For any modification of wiring on the 24V supply or on 4-20mA sensor, check the polarity prior to apply
the power. Wrong polarity may cause serious damage and destroy the Plan network. Lennox will not
accept liability for damage caused by wrong power connection or any wiring modification done by
people without valid training and qualifications.

Any external connection with the unit, using 24Vac voltage should not exceed a length of more than 30m.
It concerns external contacts connected to Climatic™50 logical inputs or humidifier control connection
to the output 0-10v.
Over 30 m, the installer must interface this information with relays or converters.
In any case, the 24Vac control voltage must not be used to drive external function with Climatic™50
logical output

WARNING: Separate as much as possible probes, displays, logical input cables from power cables with strong inductive load, in

order to avoid possible electromagnetic perturbations

.

CONNECTION

SENSORS AND PROBES

External sensors or probes connection must be carried out with the following cable:

- Cable length up to 20m: AWG22 (0.34 mm ²), 1 pair crossed with screen (2 pairs for CO2 sensor).

- Cable length up to 50m: LiYCY-P (0.34 mm ²), 1 pair with general shield. (2 pairs for CO2 sensor).
The cable length should not exceed 50m.
For a better electromagnetic protection, Lennox recommends the use of LiYCY-P cable

ROOM TEMPERATURE PROBE (NTC)

The room temperature probe (- BT10) is connected to the Climatic™ main board BM50 50 entry B7 connector J6 (refer to the unit
electrical wiring diagram).

ROOM HUMIDITY SENSOR (0-20mA/Option)

The room humidity sensor (- BH10) is connected to the Climatic™ extension board BE50 entry B1 connector J9 (refer to the unit
electrical wiring diagram).

ROOM AIR QUALITY SENSOR CO² (4-20mA / Option)

The room air quality sensor (-BG10) is connected to Climatic™ main board BM50 entry B2 connector (refer to the unit electrical
wiring diagram).

DISPLAY DS50

The Display DS50 can be connected to the Climatic™ either on one of the RJ12 connectors located on the board DT50, or
directly on the main board BM50 connector J10.
Connection is carried out by the flat 1.5m cable delivered with this DS50.
In any the case, Display DS50 cannot be remotely connected.
In case of Master/Slave installation, one, and only one, display DS50 must be connected on the pLan bus.

DISPLAY DC50 or DM50 (Remote CONNECTION)

Warning:
A wrong wiring of the display immediately damage it and/or the main board BM50.

The optional DC50/DM50 is designed to be mounted on the wall.
Fit the cable from the DT50 board through the back piece
Fasten the back piece to the wall using the rounded head screws supplied in the packaging
Connect the cable from the main board on the connector on the back of the DC50 display
Fasten the front panel on the back piece using the flush head screws supplied
Finally fit the click-on frame

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Display DC50 or DM50 is connected to the Climatic™ with the DT50 screw connector.
Connection must be carried out by the following cable:

- Cable length up to 300m: AWG22 (0.34 mm ²), 2 pairs crossed with screen.

- Cable length up to 500m: LiYCY-P (0.34 mm ²), 2 pairs with general shield.
The cable length should not exceed 500m.
For a better electromagnetic protection, Lennox recommends the use of LiYCY-P cable

CONNECTION ON DT50 REPARTITOR

Terminal connection board installation guide DT 50

The board is fitted with three "telephone" RJ12 plugs. Ensure the board is correctly connected.
Standard connection is:

BM50 on connector C
DC50/DM50 on connector A or SC
DS50 on connector B

Jumpers:
"Displays" are supplied directly by the Climatic board with 30Vdc. Take particular care at the path this 30V is taking when several
boards are being used.

J14 and J15 can switch on or off the direct current from the power supply:

- +

GND

VL

DC50 / DM50

DT50

1

1

2

2

4

4

3

3

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J14 and J15 set between1-2 :
Connectors A, B, C and screw connector SC are in parallel. Power is supplied to all connectors.

J14 and J15 set between2-3 :
Connectors B and C are powered in parallel but connector A and screw connector SC are not.
Displays connected to these ports will not be powered.

If J14 and J15 are set in different positions the "terminal connection board" DT50 DOES NOT WORK and so the
connected displays do not operate.

DM50 and COMMUNICATION MASTER/SLAVE

The intercard bus (pLan) is connected to Climatic™ on the J11 connector of board BM50.
A star connection is not recommended, for an optimum operation it is advised to connect a maximum of two cables per unit.
Connection must be carried out by the following cable:

- Cable length up to 300m: AWG22 (0.34 mm ²), 2 pairs crossed with screen.

- Cable length up to 500m: LiYCY-P (0.34 mm ²), 2 pairs with general shield.
The cable length should not exceed 500m.
For a better electromagnetic protection, Lennox recommends the use of LiYCY-P cable

Warning:
The power 24Vac of boards BM50 should not be connected to the earth

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BMS COMMUNICATION

The communication bus is connected to Climatic™ Serial Card daughter board on the BM50.
A star connection is not recommended, for an optimum operation it is advised to connect a maximum of two cables per unit.
In case of RS485bus, a resistance of 120Ω 1/4W can be connected on the last unit between the terminals + and -.
Connection must be carried out by the following cable:

- Cable length up to 300m: AWG22 (0.34 mm ²), 2 pairs crossed with screen.

- Cable length up to 1000m: LiYCY-P (0.34 mm ²), 2 pairs with general shield.
The cable length should not exceed 1000m.
For a better electromagnetic protection, Lennox recommends the use of LiYCY-P cable

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CONFIGURATION

Function

LENNOX© proposes a single software for the whole ranges of Roof-Top and Aircooler.
For a first use, before any operation of the unit, Climatic™ must be set with parameters in accordance to the range, the size and
the various options of the unit.

Description

The unit configuration is done with following menus (refer also to Menu Tree chapter):
3811 ! Unit range choice

[BC] Baltic, cooling only
[BH] Baltic, reversible (heat pump)
[BG] Baltic, gas
[BD] Baltic, gas and reversible (heat pump)
[BGN] Baltic, gas, without compressor
[FC] Flexy 1, cooling only
[FC²] Flexy 2, cooling only
[FH] Flexy 1, reversible (heat pump)
[FH²] Flexy 2, reversible (heat pump)
[FG] Flexy 1, gas
[FG²] Flexy 2, gas
[FD] Flexy 1, gas and reversible (heat pump)
[FD²] Flexy 2, gas and reversible (heat pump)

[FGN] Flexy, gas, without compressor

[FW] Flexy, cool water coil, without compressor

[FX] Roof-Top with module 4 dampers

[ANC] Aircooler, cooling only
[ANH] Aircooler, reversible (heat pump

[NSR] Unit of nonstandard request

3812 ! Unit size choice

BC BH BG BD BGN FC FC² FH FH² FG FG² FD FD² FGN FWN FX ANC ANH

BCK020NS BHK020NS BGK020SS BDK020SS BGN001S FCK085N FCM085N FHK085N

FHM085N

FGK085S FGM085S FDK085S FDM085S FGN002S FWN002S FXK025N ANCM022E ANHM022E

BCK025NS BHK025NS BGK025SS BDK025SS BGN001H

FCK100N FCM100N FHK100N

FHM100N

FGK100S FGM100S FDK100S FDM100S FGN003S FWN003S FXK030N ANCM026E ANHM026E

BCK030NS BHK030NS BGK030SS BDK030SS

FCK120N FCM120N FHK120N

FHM120N

FGK120S FGM120S FDK120S FDM120S FGN004S FWN004S FXK035N ANCM032E ANHM032E

BCK035NS BHK035NS BGK035SS BDK035SS

FCK140N FCM150N FHK140N

FHM150N

FGK140S FGM150S FDK140S FDM150S FGN005S FWN005S FXK040N ANCM038E ANHM038E

BCK040NS BHK040NS BGK040SS BDK040SS

FCK160N FCM170N FHK160N

FHM170N

FGK160S FGM170S FDK160S FDM170S

FGN002H FWN002H FXK055N ANCM043E ANHM043E

BCK045NS BHK045NS BGK045SS BDK045SS

FCK190N FCM200N FHK190N

FHM200N

FGK190S FGM200S FDK190S FDM200S

FGN003H FWN003H FXK070N ANCM052D ANHM052D

BCK030ND BHK030ND BGK030SD BDK030SD

FCM230N

FHM230N FGK085H

FGM230S FDK085H FDM230S

FGN004H FWN004H FXK085N ANCM064D ANHM064D

BCK035ND BHK035ND BGK035SD BDK035SD

FGK100H FGM085H

FDK100H

FDM085H FGN005H FWN005H FXK100N ANCM076D ANHM076D

BCK040ND BHK040ND BGK040SD BDK040SD

FGK120H FGM100H

FDK120H

FDM100H

FXK110N ANCM086D ANHM086D

BCK045ND BHK045ND BGK045SD BDK045SD

FGK140H FGM120H

FDK140H

FDM120H

FXK140N ANCM112D ANHM112D

BCK050ND BHK050ND BGK050SD BDK050SD

FGK160H FGM150H

FDK160H

FDM150H

FXK170N ANCM128D ANHM128D

BCK060ND BHK060ND BGK060SD BDK060SD

FGK190H FGM170H

FDK190H

FDM170H

ANCM152D ANHM152D

BCK070ND BHK070ND BGK070SD BDK070SD

FGM200H

FDM200H

BHK020HS BGK020HS BDK020HS

FGM230H

FDM230H
BHK025HS BGK025HS BDK025HS
BHK030HS BGK030HS BDK030HS
BHK035HS BGK035HS BDK035HS
BHK040HS BGK040HS BDK040HS
BHK045HS BGK045HS BDK045HS
BHK030HD BGK035HD BDK030HD
BHK035HD BGK040HD BDK035HD
BHK040HD BGK045HD BDK040HD
BHK045HD BGK050HD BDK045HD
BHK050HD BGK060HD BDK050HD
BHK060HD BGK030HD BDK060HD
BHK070HD BGK070HD BDK070HD

3813 ! Activation of the Controls humidity option
3814 ! Activation of the High Efficiency Main fan and/or Variable speed transmission option,
3815 ! Activation of the External Thermostat Temperature Control option,
3821 ! Choice of the type of sensor or probe on the refrigeration circuit

[No] No probe or sensor of installed on the circuits

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[NTC] Temperature probe `NTC' on the sticks of the coils
[0-5V] Transmitter of pressure `Ratiométrique' on the circuits
[4-20mA] Transmitter of pressure `4-20mA ' on the circuits

3822 ! Activation of the Low Ambient Kit option,
3823 ! Unit with water condensation
3824 ! Activation of the Alternate Defrost option for the Flexy1 range sizes 85 and 100
3831 ! Choice of the auxiliary heating type.

[No] No auxillary heating
[Hot W/Coil] Hot water coil
[Gas 2] Gas, 1 slope with 2 steps
[Gas 4] Gas, 2 slopes with 2 steps
[Gas 2 Pro.] Gas, 1 modulating slope
[Gas 4 Pro.] Gas, 2 modulating slope
[ElecH. Ste] Electric heaters, without Triac modulation.
[ElecH. Pro] Electric heaters, with Triac, Positioned after the refrigerant coil
[ElecH. Mix] Electric heaters, with Triac, Positioned before the refrigerant coil

3711 ! Choice of the type of gas valves control board.

[BG50] Board BG50
[EF49] Board EF49
[EF48] Board EF48
[EF45] Board EF45
[MMI No] Block gas with output fault in normally open
[MMI Nc] Block gas with output fault in normally closed

3832 ! Choice of the type air mixing box

[No] No fresh air
[100%] All fresh air
[0%-100%] Economiser proportional
[0%-50%] Economiser proportional, limitation to 50% of opening

3517 ! Activation of the air heat recovery option,
3833 ! Choice of the type of air flow sensor

[No] No option
[500pa] Sensor, 0 to 500 pa
[1000pa] Sensor, 0 to 1000 pa

3834 ! Choice of the air quality sensor

[No] No option
[0-2000] Sensor, 0 to 2000 ppm
[350-2000] Sensor, 350 to 2000 ppm (Carel© brand sensor)

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SCHEDULING – CLOCK SETTING

CLOCK SETTING
Function

Climatic™ has a real time clock board, allowing dates and hours functionalities (weekly Program, event recording,…).

Description

Menus 3121 to 3125 give the possibility of setting the internal clock.
The day of the week is calculated by Climatic™.
For the countries of the Euro a device allows the automatic swing of the hour summer in hour winter and vice versa. This
functionality can be cancelled by menu 3126.

3121 ! Hour.
3122 ! Minute.
3123 ! Day of the month.
3124 ! Month.
3125 ! Year.
3126 ! Enable automatic switch summer time / winter time.

SCHEDULING
Function

Controlling operation of the unit according to the time and day

Description

CLIMATICTM 50 can handle 4 time zones over the 7 days of the week:

• Zone unoccupied « Night »

• Zone A « Day A »

• Zone B « Day B »

• Zone C « Day C »

•

Starting time (hours and minutes) of each of these zones for each days of the week, can be set using menus 3211 to 3214,
(press ‘Prg’ key to change day).
Each set point integrates the hour and minute’s adjustment, thus a value of 8.3 equal 8.30 a.m.

3211 ! Hour, minute of the night starting time (unoccupied)
3212 ! Hour, minute of the “day A” starting time
3213 ! Hour, minute of the “day B” starting time
3214 ! Hour, minute of “day C” starting time

8h00 12h00 13h50 20h30 22h00

Monday

Unoccupied Z :A Z :B Z :C Unoccupied

Tuesday

Wednesday

Thursday

Friday

Saturday

Sunday

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For each time zone, the set following set points following can be modified:

LIST SET POINT BY ZONE Code

DISPLAY

CONFORT

DISPLAY

MAINTENANCE

Ambient temperature

Set point average 3311 Yes Yes

Set point dynamic 3321 Yes Yes

Cooling Set point 3322 Yes

Heating Set point 3323 Yes

Priority of heating 3324 Yes

Reheating of Fresh Air

Enable 3331 Yes

Priority of heating 3332 Yes

Fresh Air

Set point 3312 Yes

Humidity

Dehumidification 3341 Yes

Humidification 3342 Yes

Authorisation

Free Cooling 3353 Yes

Fresh Air by CO² 3354 Yes

Refrigeration by compressor 3355 Yes

Heating by compressor 3356 Yes

Auxiliary heating 3357 Yes

Humidity Control 3358 Yes

Low noise level 3359 Yes

Other

Fan, Activate 3351 Yes

Fan, Activate, in dead zone 3352 Yes

Minimum fresh air (%) 3353 Yes Yes

Programming

Beginning of zone; each day Yes Yes

Start Uno 3211 Yes Yes

Start z.A 3212 Yes Yes

Start z.B 3213 Yes Yes

Start z.C 3214 Yes Yes

With the DS50, for each set point, to press on the key `Prg' to change the periods and to validate the good set point for the good

zone.

Note: “Monday” is considered as the first day of the week for programming the CLIMATIC™50.
Factory settings:

“Day A” activated from Monday to Saturday 6h!22h

Night mode (unoccupied) for the remaining of time, Sunday included

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ANTICIPATION

Function

This allows an anticipated start-up in the morning depending on the outdoor temperature.

Description

This function only works for zone A, and allow the machine to
move from unoccupied zone to zone A earlier if the outdoor
temperature is under a certain value. Use this function to
anticipate the heating start-up during cool days.

This can be adjusted with set point 3221 and 3222.

3221 ! bottom of the slope (°C), Anticipation starting point
3222 ! Slope in Minutes of anticipation per degrees

Example:

Unit with Day A starting at 8.00 am; 3221 set to 3°C and 3222 set to 10 mn/°C;
If the outside temperature is 0°C, then Day A will start at 7.30 a.m.

7h30

8h00

Hour of starting zone A

0°C 3°C

Air Temp. Outside

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VENTILATION

ON / OFF (Start & Stop)
Function

In general, the unit is considered in operation if its supply fan is in operation.
But, according to the set points, the fan may stop in the temperature control dead zone.

Description

To allow the operation of the unit it is necessary that set point 3111 is set to `On' and that the BM50 logical input ID7 on
the J5 connector is closed.
The 3111 set point adjustment is available on the DC/DM50 with the ON/OFF functionality.

For each scheduled zone defined in Climatic™50, it is possible to set the start/stop state. This functionality allows the
unit to stop during a period of time in the day.

When the Room temperature is within the regulation dead zone, for each scheduled zone defined in the Climatic™50 it is
possible run or stop the fan

3111 ! Main On/Off.
3351 ! On/Off, adjustment by zone.
3352 ! On/Off in the temperature control dead zones, adjustment by zone.

STAGGING START
Function

After a power shut-down, you may get the units to restart gradually in order to avoid overloading issues.

Description

The units do not need to be connected; they must simply have different pLan addresses, (see BM50 pLan address
configuration).
This will enable them to restart (10 x their address number) seconds after the resumption of the power.

Example:

If a unit carries the address n°3, it will start again 30s (3 X 10 seconds) after the resumption of the power.

HIGH EFFICIENCY FANS or/and WITH VARIABLE SPEED TRANSMISSION
Function

The supply fan variable speed option allows two functionalities;
Progressive start or stop (used for the textile duct inflation)
The speed reduction, in temperature control dead zone, in order to bring only the necessary fresh air quantity.

Description

The supply fan speed is originally fixed by the set point 3422.
The speed entered in this set point corresponds to nominal air flow of the installation. This set point can only be adjusted
on site.

Progressive Start / Stop

If set point 3423 is activated;

During fan start up, for 30s, the speed is fixed by the threshold set point 3421. Then during the next 30s the fan
accelerates gradually to reach the speed fixed in the set point 3422.
During the fan stop, the speed gradually reduces to stop completely in 1 minute.

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Dead zone reduction speed in

If set point 3424 is activated;
When the room temperature is in the regulation dead zone of regulation (no heating, nor cooling), the speed of the fan is
fixed by the set point 3421 and the fresh air damper is opened at 100%.
If the minimum speed brings a fresh air quantity higher than the defined threshold, the fresh air damper will close
proportionally to reach the desired value.

3421 ! Minimum fan speed threshold (%).
3422 ! Maximum fan speed threshold (%).
3423 ! Activation of progressive Start functionality.
3424 ! Activation of dead zone speed reduction functionality.

EXHAUST FANS
Function

From one to three exhaust fans can be controlled. The start and the stop of these fans depend on the opening of the
fresh air damper.

Description

The fans are activated if the fresh air damper opening percentage is higher than the thresholds fixed by the set points.
3431 ! Fresh air damper threshold, activation of the 1

st

fan (%).

3432 ! Fresh air damper threshold, activation of the 2

nd

fan (%).

3433 ! Fresh air damper threshold, activation of the 3

rd

fan (%).

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Heating Threshold (3323)

Customer set point (3311)

Cooling Threshold

(

3322

)

Ambient Temp °C

Dead zone

Heating Mode

∆

∆

Cooling Mode

THERMOSTAT / HYGROSTAT – Set points

SET POINTS, TEMPERATURE
Function

Climatic™ is programmed in order to maintain a temperature as comfortable as possible with the most economic usage
of the unit.

Description

The room temperature is maintained between a minimum
threshold - corresponding to the heating point - and a maximum
threshold - corresponding to the cooling point. The regulation
“dead zone” is defined between these two thresholds.
In order to be user friendly, one temperature set point is used.
This set point is in the middle of the dead zone.

If this set point is modified, it has priority on the 2 thresholds, but
the dead zone range remains defined by the difference between
the 2 thresholds.
If the Thresholds 3322 and 3323 are modified, set point 3311 is
automatically calculated to their average value.

3311 ! Customer temperature set point (°C), adjustment by zone.
3322 ! Cooling temperature threshold (°C), adjustment by zone.
3323 ! Heating temperature threshold (°C), adjustment by zone.

Set point modification by an external signal

The set point can be remotely modified with a signal 4-20mA (see CUSTOMIZED INPUT / OUTPUT)
For a 4 mA signal the temperature set point is decreased by 5°k
For a 20 mA signal the temperature set point is increased by 5°k
A linear rule is applied between the two signals.

DYNAMIC SET POINT
Function

This function allows to obtain a proportional shift of the cooling threshold according to the outside temperature.

Description

The cooling threshold starts to increase once the outside air temperature is over the cooling threshold plus the value of
the dynamic set point.
If you don’t wish to use this function, allot to the option dynamic set point the value 99.9°c

Example:

If the cooling threshold is equal to 25°C and that the dynamic set point is equal to 6K
The cooling threshold drift will start for an outside temperature of 31°C (25°C + 6K) and then the threshold will follow the
outside temperature evolution keeping a 6K difference.

3321 ! Dynamic set point (K), adjustment by zone.

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FRESH AIR REHEATING SET POINT
Function

Climatic™ may be set to maintain a comfortable blowing temperature, by compensating the cold contribution of fresh air
in winter.

Description

If this function is activated:

• If the room temperature is in regulation dead zone, or heating mode, the blowing air regulation rule will maintain a

blowing temperature at least equivalent to the heating threshold.

• If the room temperature is in cooling mode, the minimum blowing temperature will be equal to the safety low limit

threshold plus 2K.

3331 ! Activation of the control of reheating of the fresh air, adjustment per zone.

HUMIDITY SET POINT (option)
Function

The relative humidity of room is maintained between two thresholds, a minimum threshold corresponding to the point of
humidification and a maximum threshold corresponding to the point of dehumidification.

Description

Dehumidification

It is ensured by the compressors in cooling mode.
It is active in the dead zone and cold mode of room temperature control.
Climatic™ gives priority to the temperature.
To ensure a complement of heating, the fresh air reheating set point must be activated.

Humidification

A signal 0-10v is generated proportionally to the regulation request.

3341 ! Dehumidification threshold - Relative humidity (%hr), adjustment by zone.
3342 ! Humidification threshold - Relative humidity (%Hr), adjustment by zone.
3358 ! Activation or inhibition, humidity control.

CLIMATIC™50 – IOM – Rooftops/ Aircoolair CL50-ROOFTOPS-IOM-1107-E

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THERMOSTAT / HYGROSTAT – Control principle

Function

Adjust and hold the room air temperature or humidity as close as possible to the set point, by controlling the number of
compressor stages depending on the thermal load of the system.

Description

CLIMATICTM50 control constantly calculates the required capacity to reach the temperature set point.
This variable is called “CAPACITY FACTOR” (CF) and its value can vary from 0 to 100%.
It is directly linked to the number of control stages of the unit.
Thus for a unit with 4 stages of regulation, the CF will start and stop a stage with the following values:
0-25-50-75-100.
It then evolves following the principles detailed in the diagram below (case of a cooler):

In order to anticipate, the reference point is recalculated each time the difference between air temperature and set point
reach a minimum or a maximum.

The rate of change of the Capacity Factor (CF) is determined by another parameter called “REACTIVTY” and which
value is in: % of CF / °C (Diff vs Set point) / min

3361 ! REACTIVITY for the cooling mode.
3362 ! REACTIVITY for the heating mode.
3363 ! REACTIVITY for the fresh air reheating mode

For the option of control humidity

3364 ! REACTIVITY for the dehumidification mode.
3365 ! REACTIVITY for the humidification mode.

Permutation, Cold or Heat Mode (Change-Over ; optional)

The choice of the operating mode in cooling or heating is automatically carried out according to the room temperature
and the temperature set points adjustment.
Meanwhile as an option, using free contacts on parametric inputs, it is possible to disable one mode or another. (see
Customized Input / Output (BE.50))

• With a free contact on [Sw Dis.Cool] The contact closing will disable the cooling mode.

• With a free contact on [Sw Dis.Heat] The contact closing will disable the heating mode.

Difference between

the Room

Temperature and the

set point

Room Temperature

Change rate

0°K

+ 2°K

- 1°

K

- 2°

K

FAST

SLOW

CF FROZEN

CF INCREASES

(Start more Capacity Stages)

CF FROZEN

CF DECREASES

(Removes Capacity Stages)

+ 1°K

SLOW FAST

CLIMATIC™50 – IOM – Rooftops/ Aircoolair CL50-ROOFTOPS-IOM-1107-E

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FRESH AIR DAMPER - Free-Cooling

Function

Ensure a minimum fresh air introduction into the room and/or a free-cooling, thus reducing electric consumption.

Description

MINIMUM FRESH AIR

Adjustment by set point

The fresh air rate is adjustable by set point.
3312 ! Minimum opening of the fresh air damper, %, adjustment by zone.

Adjustment by free contacts (optional)

With the customized free contacts, the fresh air rate can be adjusted. (see Customized Input / Output (BE.50))

• With a free contact on [0% F.A.]) The contact closing will close completely the damper.

• With a free contact on [100% F.A.] The contact closing will open completely the damper.

• With a free contact on [10% F.A.], [20% F.A.], [30% F.A.], [40% F.A.] or [50% F.A.] The contact closing will open the

damper to the mentioned rate.
If several contacts are customized with this functionality, the air damper will open according to the sum value of all closed
contacts.
In any case, the minimum fresh air rate will be fixed according to the highest value between the set point and the request

by contacts.

Adjustment by external signal (optional)

The minimum fresh air can be remotely modified by a signal 4-20mA. (See Customized Input / Output (BE.50))

For a signal of 4 mA applied on [F.A Offset] the threshold is set to 0%
For a signal of 20 mA applied on [F.A Offset] the threshold is set to 100%

A linear rule is applied between the two limits.

Air quality sensor, CO² (optional)

If a CO² sensor is connected to the unit, the minimum value of fresh air is calculated according to the CO² rate.
This functionality can be activated, or not, within the 4 day zones.
Two opening mode may be selected:

• Fresh air damper opening between 0% and the minimum fresh air set point [0-Min]

• Fresh air damper opening between the minimum fresh air set point and the maximum fresh air set point. [Min-max]

0

2000 ppm

Set point

3513

Set point

3514

Minimum

Fresf Ai

r

Set point

3512

0 2000

ppm

Set point

3513

Set point

3514

Minimum

Fresh Ai

r

CLIMATIC™50 – IOM – Rooftops/ Aircoolair CL50-ROOFTOPS-IOM-1107-E

19

2132 ! CO² rate measured value of the (ppm).
3354 ! CO² function authorization, adjustment by zone.
3515 ! CO² function mode [0-Min], [Min-Max].
3513 ! CO² rate (ppm), threshold until which the 0% or the minimum fresh air is maintained.
3514 ! CO² rate (ppm), threshold from which the minimum fresh air or the 100% is used.
3512 ! Maximum fresh air damper opening.

Fresh air damper Calibration

The real fresh air volume introduced into the system is not always proportional to the damper opening percentage. That
is particularly true when the return air duct system is sized to give excessive pressure losses.
It results with excessive fresh air input, and thus with an increase of the system exploitation costs. From now on, it is
possible to calibrate the fresh air using three temperature probes: one in the blowing section, another in the return air
and the last one in the outdoor temperature.

Using these three probes, Climatic™50 calculates and memorizes the exact percentage of fresh air for each position of
the damper.

Blowing T° = Return T° x %Return Air + Fresh air T° x %Fresh Air

This adjustment sequence takes place periodically when all heating and cooling elements are off.

3516 ! Fresh air damper calibration authorization.

FREE COOLING

From a room temperature need (Capacity Factor) the damper opens according to a proportional rule on the blowing
temperature.
0% need = Minimum fresh air.
100% need = low limit threshold (3373) + 2K

The user may choose to limit the fresh air damper operation with contacts or set points modification (see minimum fresh
air § above). The outdoor temperature or humidity value may also limit the opening.

Outdoor temperature

The Free-Cooling is stopped if the outside temperature is higher than the return or room temperature.
The Free-Cooling is stopped if the outside temperature is lower or higher than the threshold defined in set point (3511).
Free cooling is forbidden on high limit for a set point adjustment over +20.0°c.
Free cooling is forbidden on low limit for a set point adjustment lower than +20.0°c.

Outdoor humidity (optional)

If humidity control option is selected, the Free-cooling is stopped if the external absolute humidity (water weight) is

higher than the indoor absolute humidity.

Set point

The Free-Cooling is stopped if the set point (3353) is No

Free contact (optional)

Stop of Free-Cooling by closing customized free contacts. (See minimum fresh air § above)

[0% A.N.] = the register of air is completely closed.
[100% A.N.] = the register of air is completely open.

3353 ! Economiser functionauthorization, adjustment by zone.
3373 ! Low limit blowing temperature threshold.
3511 ! Outdoor temperature threshold for authorization of the economiser function.
3512 ! Maximum fresh air damper opening

CLIMATIC™50 – IOM – Rooftops/ Aircoolair CL50-ROOFTOPS-IOM-1107-E

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COMPRESSORS

Function

From a room temperature need (Capacity Factor) the compressors are started and stopped with a determined sequence
in order to minimize the anti short cycle protection effect and to equalize the operating time.

Description

Compressors Start/Stop sequences.

This sequence is set by the memorized compressor operating time and it also includes the other compressors back-up
function, if they are not available. For circuits with tandem compressors, it is possible to favour the unit performance,
COP, rather than the compressor operating time balance (3642).

The compressor starts if all the following conditions are satisfied:

• The unit, the compressor and the circuit do not have major faults.

• The control requires the starting of the compressor.

• The compressor has the lowest operating time among the stand by compressors.

• The compressor has not been brought into service for at least 6 minutes.

Every compressor state can be checked on the following menus: 2512, 2522, 2532…, 2562
To check the operating time of each compressor use menus: 2519, 2529….2569
To reset an operating time counter, put the DS50 cursor on the line and press the key `Enter' during 20 seconds.

Compressor operation authorization.

The user may choose to limit the operation of the compressors by using contacts or set points modification.

Outdoor temperature

Cooling mode

Stop of all compressors if the outdoor temperature is lower than the threshold (3612)
Stop of 50% of the compressors if the outdoor temperature is lower than the threshold (3611)
Note: if the option `Low Ambient Kit' is activated (3822) these two functionalities are disabled.

Heating mode (Heat pump)

Stop of all compressors if the outdoor temperature is higher than the threshold (3613)

Set points

Stop of one or several compressors if the compressor number is not displayed in the address (3641)

Cooling mode

Stop of all compressors if the instruction (3355) is set to [No]
Limitation to 50% of the compressors if the instruction (3359) is set to [Yes]
Immediate stop of 50% of the compressors if the instruction (3643) is set to [Yes]

Heating mode (Heat pump)

Stop of all the compressors if the instruction (3356) is set to [No]

Note: Address 3355 and 3356 can be set differently for zones A, B, C, Uno or BMS
Note: The address 3359 can be set differently for zones Uno or BMS

Free contacts (Optional - See Customized Input / Output (BE.50))

Stop of one or several compressors if the compressor number is not displayed in the address (3641)

Stop of 50% of the compressors if the contact [Dis. 50%Cp] is close.
Stop of all the compressors if the contact [Dis. Cp/Ah] or [Dis. Comp] is close.

High pressure offloading (FLEXY 2 tandem only)

With tandem compressors, it is possible to reduce the circuit capacity by stopping one of the two compressors before the
high pressure reaches its limits in order to keep a partial capacity with high outdoor temperature.
If the condensing pressure is higher than 40b and continuously increases with all the fans in operation at full speed, 1
compressor of the considered circuit is stopped.

CLIMATIC™50 – IOM – Rooftops/ Aircoolair CL50-ROOFTOPS-IOM-1107-E

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3355 ! Compressors authorization in cooling mode, adjustment by zone.
3356 ! Compressors authorization in heating mode, adjustment by zone.
3359 ! Limitation to 50% of the compressors, in Unoccupation and BMS mode.
3611 ! Low outdoor temperature threshold for limitation to 50% of the compressors, in cooling mode
3612 ! Low outdoor temperature threshold for stopping all compressors in cooling mode.
3613 ! High outdoor temperature threshold for stopping all compressors in heating mode..
3641 ! Compressors authorization.
3642 ! Rotation mode choice.
3643 ! Off loading of 50% of the compressors.

CLIMATIC™50 – IOM – Rooftops/ Aircoolair CL50-ROOFTOPS-IOM-1107-E

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DEFROST – Heat Pump

Function

Avoid the evaporator icing (external coil) in heat pump operation in winter time.

Description

To avoid the icing of the external air exchanger in winter operation, it is necessary to reverse the refrigerant cycle on a
regular basis to de-ice by heating the exchanger.
The defrost is activated when the air temperature is under a set point (3422)

When defrost is demanded, the sequence is as following:

1. Pre-heating of supplementary heating elements during 1 minute (Option)

2. Stop compressors and fans

3. Reverse 4 way valve

4. Start compressors.

5. When the fans are started several times (3625) or if compressors are in operation for more than 6 minutes, stop
the compressors.

6. Reverse 4 way valve

7. End of defrost

Two different type of Defrost demand are possible.

• Dynamic defrost (set point 3621 = Dynamic)

• Cycling defrost (set point 3621 = Cyclic)

Cycling defrost

The unit will start a cyclic defrost under a regular period of time (instruction 3624)

Dynamic defrost

This allows the unit to start the defrost cycle only when required. This is achieved through the measurement of the
temperature difference between the coil and the outdoor. The defrost will be initiated shortly after the Climatic50 has
located the largest gradient in the curve.

3621 ! Defrost mode.
3622 ! Outside air temperature under which the defrost cycle is activated.
3623 ! LP temperature under which the defrost cycle is activated for the cyclic mode and defrost cycle activation

sensibility for the dynamic mode (standard ratio between dry coil ∆T and iced coil ∆T) .

3624 ! Minimum compressors operating time between 2 defrosts
3625 ! Number of fans Restart operations according to the pressure.

Temperature difference

between coil and outdoor

Coil

clean

Coil freezing

Coil

frozen

Defrost cycle start

Highest gradient

Time