Lennox AIRCOOLAIR ASC Series User guide

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AIRCOOLAIR
APPLICATION
GUIDE
ASC/ASH + CIC/CIH
Large ducted split
19 134 kW
ASC/ASH
Air cooled condensing unit
20230 kW
AIRCOOLAIR-AGU-1603-E

• 1 •
AIRCOOLAIR
1. 2
2. 7
3. 13
4. 16
5.
22
44
6. 45
7. 49
8. 54
9. 58
10. 59
Application Guide • AIRCOOLAIR-AGU-1603-E
APPLICATION GUIDE
Ref : AIRCOOLAIR- AGU-1603-E
TABLE OF CONTENTS
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 operation of this product), reproduced, issued to or made
available to third parties without the prior written agreement of Lennox.
Product designed and manufactured under a
quality management system certified ISO 9001. Our company’s products comply with European standards.
GENERAL DESCRIPTION
OPTIONS
GENERAL DATA
VENTILATION DATA
PERFORMANCES
Cooling and heating capacities
Auxiliary heaters selection
ACOUSTIC DATA
ELECTRICAL DATA
DIMENSIONAL DATA
WEIGHTS DATA
REFRIGERANT CONNECTIONS

• 2 •
AIRCOOLAIR 20S 140D 200D & 230D
ASC/ASH + CIC/CIH A NA
ASC/ASH A
ASC / ASH 020S 025S 030S 035S 040S 045D 055D 070D 085D 100D 120D 140D 200D 230D
AB C DE
CIC / CIH 020S 025S 030S 035S 040S 045D 055D 070D 085D 100D 120D 140D
ABCD
AC
SI
CC
020
S
N
MR410A
3
M
Application Guide • AIRCOOLAIR-AGU-1603-E
GENERAL DESCRIPTION
MODEL NUMBER DESCRIPTION
EXAMPLE : ASC 020S NM3M + CIC 020S NM3M
A BOX
OUTDOOR UNIT
INDOOR UNIT
A BOX
B BOX
B BOX
C BOX
C BOX
D BOX
D BOX
Split
Condensing unit
Box
Box
OUTDOOR UNIT INDOOR UNIT
AIRCOOLAIR Common to AIRCOOLAIR and COMPACTAIR ranges
Single split Indoor unit
C = Cooling only
H = Heat pump C = Cooling only H = Heat pump
COMMON TO AIRCOOLAIR AND COMPACTAIR RANGES
Cooling capacity in kW
S = 1 circuit
D = 2 circuits
Not used
Revision number
400 V / 3 / 50 Hz

• 3 •
Application Guide • AIRCOOLAIR-AGU-1603-E
GENERAL DESCRIPTION
INTRODUCTION
AIRCOOLAIR range is developed from ECOLEAN liquid chiller range and
exists in two versions:
• AIRCOOLAIR SPLIT UNIT
it can be used for medium to large commercial cooling and heating
applications when the premises are not directly accessible from the roof.
AIRCOOLAIR split unit exist in cooling only and heat pump versions.
• AIRCOOLAIR CONDENSING UNIT
It is the outdoor unit without the supply section. This unit is available as
cooling only or as heat pump and can be combined with air handling
units. It provides you with a low noise level, high efficiency and almost
customized units.
Casing
- Casing made of galvanized steel sheet metal painted with a
white RAL 9002 powdered polyester paint and a RAL3003
red stripe.
- Rigid, hot dipped galvanized chassis.
- Unit lifting and handling via the base frame.
- State of the art design with hidden compressors, fans and
pump for perfect architectural integration.
- Sidegrillesasoptionto protect theunit during transportation
and against human aggressions.
High efficiency multiscroll technology
- ExclusiveCompliantScroll®designwithbothaxialandradial
compliance to increase compressor operation tolerance
to liquid refrigerant, substantially improving durability and
reliability.
- Motor cooled by suction gas.
- Motor protection device against high temperature or over
current situations.
- Discharge non-return valve.
- Crankcase heater as standard on heat pump and optional
with winter operation down 0°C for cooling only units.
- Direct on line start.
- Low noise scroll compressors insulated with a compressor
acoustic jacket.
- Compressorsmountedonhighefficiencycellularpolyurethane
vibration absorbers.
Advanced condenser fan design
Fan-motorassemblyusingexternalrotortechnologyassociated
withOWLEThighperformancealuminumfanbladesofthelatest
fan technology to improve energy consumption and airflow rate
ontheoutdoorcoilswhilereducingsoundpowerlevel.Axialfans
speed are 700 or 900 rpm according to models, direct coupling,
with available static pressure up to 75 Pa as standard.
Pressure version for size 100 to 230 : speed axial fans are
1450 RPM, direct coupling, with available static pressure up to
250 Pa. For small sizes, COMPACTAIR is the appropriate unit
for technical room.
.
Heat exchanger
Made of copper tubes and aluminum corrugated swirl fins, the
coil heat exchanger are designed to maximize the output.
Refrigerant circuit:
AIRCOOLAIR outdoor units operate with R410A refrigerant.
For cooling only outdoor units, each circuit includes in stan-
dard:
- High pressure switch with automatic reset.
- Low and high pressure transducers.
On heat pumps outdoor units, each circuit includes in addition,
as standard :
- Four-way valve
- Liquid receiver
- Thermostatic expansion valve
- Filter drier
Each refrigerant circuit is pressure and leak tested with a
Hydrogen/Nitrogenmixture,andvacuumedbeforebeingcharged
withnitrogen.Allunitsarethensubjectedtoacompletefunctional
and operational run test to guarantee perfect sealing before
leaving the factory.
Electrical box:
- Unit wiring in compliance with standard EN 60204-1.
- IP54 water protection.
- Circuit breaker protection for compressors and fans.
- Compressor and fan working contactors.
- Terminal block and wiring for power supply to the unit.
- Power supply 400V/3/50Hz without neutral except for size
20S with neutral.
OUTDOOR SECTION
ASC & ASH

• 4 • Application Guide • AIRCOOLAIR-AGU-1603-E
GENERAL DESCRIPTION
Casing
Casing made of galvanized steel sheet metal painted with a
white RAL 9002 powdered polyester paint.
Fan
Indoor sections are supplied with one or two double-inlet
centrifugal fans. Double fans are fitted with a common axle with
one motor. Equipped with adjustable drive, variable pulley and
belt, to set up the right airflow on site.
Air filter
G4 washable air filter; auto extinguishable material with M1
classification.
Heat exchanger
Made of copper tubes and aluminum corrugated swirl fins.
Refrigerant circuit:
On cooling only and heat pumps indoor units, each circuit
includes as standard :
- Thermostatic expansion valve
- Filter drier
Each refrigerant circuit is pressure and leak tested with a
Hydrogen/Nitrogenmixture,andvacuumedbeforebeingcharged
withnitrogen.Allunitsarethensubjectedtoacompletefunctional
and operational run test to guarantee perfect sealing before
leaving the factory.
R410A refrigerant
Efficient systems such as AIRCOOLAIR are designed around
R410A refrigerant to achieve the best performances.
- Energy efficient refrigerant thanks with pressure drop in the
pipes: Higher evaporating pressure and lower condensing
pressure improve compressor EER & COP.
- R410Acompressors have a better isentropic efficiency.
- Environmentally friendly refrigerant: It contains No Chlorine
(ODP = 0).
Free cooling: economizer for Split Unit
Indoor sections are supplied with one or two double-inlet
centrifugal fans. Double fans are fitted with a common axle with
one motor. Equipped with adjustable drive, variable pulley and
belt, to set up the right airflow on site.
Dynamic and alternate defrost
Defrost is necessary to ensure efficient operation of heat
pumps in winter. The unit starts defrost cycle when the outside
temperature is below a set temperature and repeat the defrost
cyclesperiodically.Itresultssometimesin startingan expensive
defrost cycle when it is very cold outside but very dry, or too
warm, in other words when the coil is not frozen.
- Dynamic defrost is Lennox’answers to unnecessary defrost
cycles.Dynamicdefrostdetectsicingofthecoilbymonitoring
the difference between refrigerant and outside temperature
andstartsthedefrostcycleonlywhenrequired.Undercertain
conditions a rooftop unit equipped with this built in dynamic
defrost feature can run several hours in heat pump mode
withoutstartingany defrost cycle.Dynamicdefrostcan save
up to 15% on annual energy consumption.
- Alternate defrost saves energy by reducing the need for
auxiliaryheatingduringdefrostcycles.WithAlternatedefrost
when one circuit starts a defrost cycle the other circuit is
running in heat pump at full capacity to minimize the need
for auxiliary heating.
Morning anticipation and dynamic set point for Split
Unit :
Theunitcanbeprogrammedtoswitch-oninthemorningtoreach
the occupied zone temperature set point just in time.
Dynamic set point can be used in summer to offset the ambient
temperature set point according to the outdoor temperature.
Thisistoavoidlargetemperaturedifferencebetweenindoorand
outdoor. The indoor temperature set point would then increase
withtheoutdoortemperatureimprovingcomfortandsavinglarge
amount of energy
Scheduling / Time zone Management:
Inordertoensuretheunitperfectlymatchestherequirementsof
themost difficultapplications intermsofoccupationand varying
internal loads, the CLIMATIC 60 offers now up to 7 time zones
per day (Z0 to Z6) adjustable by steps of 10 minutes. Each time
zonecanbeprogrammedtofollowoneoffourpossibleoperating
modes: A,B,C & D
INDOOR SECTION
CIC & CIH
ENERGY SAVINGS

• 5 •
Application Guide • AIRCOOLAIR-AGU-1603-E
GENERAL DESCRIPTION
Thenewgenerationofmicroprocessorbasedcontrol,CLIMATIC
60 equip the AIRCOOLAIR range.
It inherits more than 20 years of technology and field operating
experience from its predecessors Climatic control platforms.
CLIMATIC 60 controller intelligently improves efficiency and
helps set up and service operations to guarantee long lasting
performance.
CLIMATIC 60 is designed to provide the best energy efficiency
throughoutunit’slifecyclewhileensuringreliableandconsistent
operation with user friendly interfaces.
Thisnewcontrollerconstantlymonitorsmoremachineparameters
than ever to improve unit operation and maximize efficiency
and reliability
The PI algorithm of the CLIMATIC 60 controls the supply air
temperature and a temperature difference between supply and
return. It is able to optimize the refrigeration circuit operation to
match perfectly the required cooling or heating load maximizing
efficiency and comfort.
It will also improve reliability with features such as compressor
operating limits monitoring, (High and Low refrigerant pressure
and temperature now measured and displayed on DS60 and
Bus) refrigerant leak detection or compressor operating time
equalization and protection against excessive short cycling.
Faults and alarms
CLIMATIC60managesmorethan 90differentfaults andalarms
codes and can store the last 32 with time and date. The stored
faults and alarms can then be displayed on the DS60 and on
the communication bus with the full text detail.
Intelligent air quality management
With accurate percentage of fresh air the dampers are regularly
calibratedtointroducejusttherequiredamountoffreshairinthe
buildingtoreduceannualenergyconsumption.Thefreshairratio
can also be controlled using the indoor CO2 level as an input.
Intelligent heating priority optimization
This feature allows the user to program the priority between the
different heating elements (thermodynamic, electric heaters or
auxiliary heating). This is particularly interesting on units with
electrical pre-heaters. This feature maximizes energy efficiency
by optimizing heat pump operation depending on the outdoor
temperature.
Filtration
Twofiltrationlevelsareavailable.ThestandardequipmentisG4
washable and refillable filters with metallic frame. This type of
configuration allows to extend the lifecycle of filters and reduce
the cost of replacement, changing only the media. G4 pre-filter/
F7 filter is optional.
Fire Insulation
AirtreatmentsectionsareinsulatedwithM1material:thisinsures
that the insulation doesn’t burn and doesn’t create toxic smoke.
M0 insulation is in option mechanically fitted.
CONTROL
COMFORT AND AIR QUALITY OF SPLIT UNIT

• 6 • Application Guide • AIRCOOLAIR-AGU-1603-E
GENERAL DESCRIPTION
Power supply
Tomakeinstallationeasier,AIRCOOLAIRpowersupplydoesnot
require «neutral» connection. It is powered by 400 V, 3 phases,
50 Hz except size 20S
Circuit breakers
To improve the safety of the AIRCOOLAIR and extend its life,
circuit breakers protect against over-loading, over intensity and
a disconnected supply phase. Maintenance is also improved as
there is no requirement to change fuses. The electrical panel is
manufactured in accordance with EN60204-1 (1998) electrical
directive.
Adjustable ventilation for Split Unit
Airflow and external static pressure characteristics are adjusted
inthefactoryto deliver the right pulleyandbeltto be the nearest
tothesite needs. However, onceonsite, the realcharacteristics
of ventilation requirement might be slightly different than theory
measured on drawings: therefore, AIRCOOLAIR Split unit
is delivered as standard with adjustable pulley opened. This
remains the possibility to adjust the airflow accurately at the
commissioning and find the perfect airflow for the site comfort
and system efficiency.
Refrigerant pressure reading :
No need to access to refrigerant pressure gauges.
Refrigerantpressuresandsuperheatoneachcircuitcanberead
directly on the service display DS60 or a BMS as all units are
equippedwithhighandlowpressuretransducersandrefrigerant
suction temperature probes
Easy access
Allaccesstointernal components of theAIRCOOLAIRunits are
closed by panels equipped by locks and handle for quick and
easy dismounting. No more screws are used as panel fixtures.
Assembly quality, compliance to PED 97-23, EN 60204-1, CE,
made in an ISO 9001v2000 factory. Whatmakesthedifferencearethesmalldetailswhichhavegiven LENNOX its reputation. Electrical components are selected to
thehigheststandards,refrigerationcomponentsaregenerously
sized to ensure maximum performance and reliability. Quality
manufacturing procedures together with a culture of continuous
improvementat allLENNOX factories,ensurestheproductsare
built to the highest standards.
AIRCOOLAIRcompliestoEN60204norms,PED97-23directive,
isCEcompliantandisbuiltinanISO9001v2000certifiedFactory
PLUG AND PLAY UNIT
EXTENDED LIFECYCLE

• 7 •
020S - 045D 055D - 140D
020S - 045D 055D - 140D
Application Guide • AIRCOOLAIR-AGU-1603-E
OPTIONS
FRESH AIR OPTIONS
Economizer
Free cooling is provided through the use of fresh air when it’s
appropriateratherthancoolingthereturnair.Usinganeconomizer
is the easiest and most efficient way to modulate fresh volumes
andreducerunningcostsfor airconditioningapplication,aswell
as improving air quality. Fully controlled by the CLIMATIC, it is
also able to ensure that minimum fresh air is provided in line
with IndoorAir Quality Regulations. Economizer operates using
a «sensible» control. It is possible to prevent the economizer
from supplying air below a certain temperature (adjustable set
point, 10°C as default).
On sizes 20S to 45D, the economizer is factory fitted on unit
and tested prior to shipment. It includes 2 dampers operating
from a 24V actuator.
On sizes 55D to 140D,theeconomizerisdeliveredasaseparate
module that can be installed as monobloc on site. It includes 3
dampers operating from 3x 24V actuators
Exhaust module
The exhaust fans eliminate the air overpressure in the room. It
is driven by the Climatic controller.
On sizes 20S to 45D, it is delivered as a separate module that
can be connected to the return duct.
On sizes 55D to 140D, this exhaust fan is in built in the
economizer casing
Return Module
The RETURN FAN module is necessary when the return duct
circuit creates high pressure drops. It offers available static
pressure up to 250-300 Pa.
Itincludesa separate casingtobe connected totheeconomizer
casing with the ductworks.
The return module drives the opening and closure of the 3
dampers regarding the amount of fresh air introduced.
eDrive: available in Non Standard Request
eDrive, direct transmission on return fan and supply fan :
variable speed fans adjust airflow rate to the exact needs
and during unoccupied period. This feature saves up to 30%
annual energy consumption and reduces maintenance costs.
CLIMATIC manages air flow rate passing through the unit
following 3 possible strategies.
eDrive control strategies can be changed with each time zone
in occupied or unoccupied mode. Whatever the control stra-
tegy, soft starter is still available to inflate flexible ducts and
reduce inrush current during fan starts.
- Standard mode : Constant air flow rate
- Dead Zone mode : Reduced air flow rate in “dead zone”.
- Part Load mode : Variable air flow rate during part load and
dead zone.

• 8 • Application Guide • AIRCOOLAIR-AGU-1603-E
OPTIONS
High filtration level - G4 pre-filter / F7 filtration
G4pre-filter50mm/F7filter100mmarebothinmetallicrefillable
frames.Thisconfigurationallowsextendingthelifecycleoffilters
and reducing the cost of replacement, changing only the media.
100 mm filters have been selected also to reduce the energy
consumption due to:
- lower pressure drop especially when the filters start being
dirty.
- decrease of the replacement frequency.
Analog dirty filter and fan control :
This analog pressure sensor analyses the clogging of the filters
to inform the user and to allow preventive replacement of the
filters that will decrease the energy consumption and increase
the air quality.
Air Quality sensor :
Thisfunctionallowstoadapttheminimumfreshairtothebuilding
occupancy. It measures the CO2 level and adjust the fresh air
volume accordingly.
IndoorairqualityiscontrolledfromtheCLIMATICmaincontroller.
AVOC(VolatileOrganicComponent)sensordetectstheamount
of CO2 in the ambient air between 0 and 2000PPM. The VOC
sensor sends a proportional signal (0-20mA) to the CLIMATIC
controller which will then modulate the fresh air damper.
Stepped or modulating Electrical heaters
Additionalorinsteadofheatpumps,Lennoxoffersmanyauxiliary
heaters on every air-to-air units. This helps to adapt to local
climaterequirement,localregulationpreferencesandapplications
variable heating needs.
Standard,MediumandHighheatingpowercapacityareavailable
on each unit size
High electrical heater is also available as modulating instead
of 2-stage heater.
Theperformancesofthisoptionareavailableinauxiliaryheaters
selection: page 44
The electric heater comprises of shielded resistance heaters,
which are smooth anticorrosion tubes 8 W/cm² capacity.
3securityelementsareinsuringpermanentcontrolsoftheheaters:
- 2hightemperaturelimitcontrolsofferoverloadprotection.An
automatic reset safety thermostat is set at 75°C – a manual
reset safety thermostat is set at 105 °C; both located at less
than 150 mm over electric heaters. This is provided as a
standardfeatureontheelectricheater,withtheelectricpower
supply cables made of reticulated silicon rubber, resistant to
temperatures up to 200°C.
- an air pressure differential controls the fan activity and dis-
connects the electrical heater in case of critical airflow
- dualcontactorareinsuringsaferedundancyincaseoffailure
of one dry contact
Modulating Hot water coil :
This modulating heater is equipped with a 3 way valve offering
accuratecomfortandelectronicadjustableantifreezeprotection.
This avoids the use of glycol in most of European regions.
The hot water coils and control valves are factory fitted in air
treatment section.
Theperformancesofthisoptionareavailableinauxiliaryheaters
selection page 44.
INDOOR AIR QUALITY OPTIONS
AUXILIARY HEATERS OPTIONS