Aircalo MISTRAL M30 Manual

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INSTALLATION AND
MAINTENANCE MANUAL
MINI AIR HANDLING UNIT
« MISTRAL »

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1.Presentation 3
2.Generalities 3
2.1.Warnings 3
2.2.Generalities 4
2.3.Safety instruction 4
3.Reception - Storage 4
4.Installation 4
4.1.The choice of the place 4
4.2.Handling 5
4.3.Ceiling installation 6
4.4.Floor installation 6
4.5.Vertical installation 7
4.6.Outdoor installation 8
4.7.Roof mounting 8
4.8.Assembly of units and accessories 8
4.9.Assembly of flexible flanges 9
5.Hydraulic connection 10
5.1.Coils connection 10
5.2.Evacuation of condensates 11
5.3.Control valves 13
6.Air duct connection 13
7.Electrical connection 19
7.1.Identification plate 19
7.2.Electrical batteries 19
7.3.Fans AC – IE2 20
7.4.Fans EC 21
8.Dimensions and weight 23
9.Maintenance 24
10.User guide 24
11.Electrical diagrams 25
11.1.Electrical batteries 25
11.2.Fan Motor Assembly AC-IE2 25
11.3.Fan Motor Assembly EC 25

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1. Presentation
Mistral is a compact air handling unit for heating and cooling applications essentially on pipework system with
water coils and/or electric batteries supply.
Mainly used in ceiling mounting, it offers the advantages of a compact ceiled device associated to the modularity
of classic air handling units.
Standard units are made with a double-skin casing in steel with 1 mm of thickness + 25 mm of insulation
classified M0. Those units also exist in a superposed configuration with plate heat exchanger.
To the main casing [fan + coil + filters sections] for the long casing, [fan + filters sections] for the short casing,
some optional accessories could be added before and after as:
Flexible flanges and/or dampers
Mixing box 2 or 3 ways
Filter casing with rigid filter
Additional electric battery casing
Additional water coil casing
Sound Attenuators casing (supply and/or return)
Plenum with spigots
Heat recovery exchanger casing
Some constructive options are proposed:
Lacquer-coated RAL 9010
Super insulation acoustic TSR (Technic of spread sound).
The range is composed of 3 sizes and 5 models. The ventilation is provided by a free wheel + motor (AC IE2 or
EC). The speed variation is got by the use of a frequency converter (for AC IE2) or by a signal 0-10V (for EC).
2. Generalities
2.1. Warnings
Read carefully this manual before starting the installation.
Confide the installation to a qualified installer.
The units must be installed and bring into service respecting all instructions giving in this manual and in
compliance with local regulations. The installer will have to establish a declaration of conformity and
mark the installation.
Check that the tension and the frequency of the power supply is like the ones necessary at the unit
which has to be installed. Eventually, take into account of others devices connected up at the same
electric circuit. Also make sure that the safety requirements of national standards have been respected
over the power supply circuit and in particular that you dispose of a connection on the floor with an
adequate size.
After the installation, make a complete test of the system and explain all the functions to the user.
It is recommended to disinfect once by year, condensate drain pan to avoid the development and
spreading of legionella.
Use this unit only as a part of registered applications.
Keep the unit away from frost.
Before any intervention on the system and before handling any intern components cut the power
to the main circuit-breaker.
The manufacturer declines any responsibility for damage caused by the modification or mistake in
electric connections or hydraulic connections. Failing to follow the manufacturer instructions concerning
the installation or the use of the unit in conditions that exceed functioning limits indicated in this manual
can lead to the loss of the unit warranty.
Failing to follow the electrics security rules can caused a risk of fire in the case of an electric short
In case of an unusual functioning, turn off the unit, remove the electricity supply and contact specialized
personnel.
Maintenance must be made only by qualified personnel.
Recycle packaging in accordance with local laws regarding waste

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2.2. Generalities
It should be avoiding the use of mini AHU in an atmosphere that contains oil vapors, sea air, corrosive or
dusty air.
Unless particular conditions, the manufacturer gives one year parts warranty against defects in
conception or production. Are excluded defects of installation and use and also wearing parts and
environment condition which damage the smooth functioning of the device that would not be specified in
the order.
The units should be mounted and bring into service following the instructions giving in this manual in
compliance with local regulations. The installer will have to establish a declaration of conformity and
mark the installation.
2.3. Safety instruction
Installation works and start-up should be made by qualified personnel.
Before any intervention:
Disconnect the power supply
All mobile parts (motors, fans, dampers, etc…) must be turn off.
Wait the drop of temperature of hot parts (heat exchanger, electric batteries, motors, etc…)
Wait pressure balance in unit boxes.
During the intervention or start-up, never exceed the operating range of the unit.
3. Reception - Storage
Ensure that the unit has not been damaged during the transport. If it is the case, it must be done
reserves over the delivery coupon of the transporter and confirm to him by registered letter over 48
hours. Does neither install nor use damaged devices.
Check the conformity of goods delivered in relation to the order. Read and control the instructions over
the identification plate.
The unit must be delivered in a pallet over shrink packaging. Additional casings and accessories could
be packaged in the same pallet or individually
Storage the equipment in a clean, dry place, protected from shocks, vibration and temperature
fluctuation and at a relative humidity level of less than 90%. The period of storage should not exceed 1
year.
Proceed with the unpacking of the device using the protections of accident prevention which are
required.
4. Installation
4.1. The choice of the place
Avoid the following locations:
Areas close by sources of heat.
Humid locations and places where water may penetrate into the unit.
Location advised:
Consider a location where the installation will be easier
Allow required clearances.
It could be easy to connect condensate drain pipe to the appropriated pipework

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Space for maintenance
In the chosen location, check that the clearances (lateral or by the bottom) around the unit offer enough
space for maintenance. If it is needed, make a test by taking out the coils, motors, fans and filters.
Withdraw by the bottom
The filters could be removed laterally (from 2 sides) or by the bottom of
the standard device. In this case, foresee a clearance of 338 mm.
Bottom withdrawal only possible on main casing (not on additional
module)
Withdraw by the side
Minimum distance to keep in order to withdraw by the
side the internal components (filters, coils, or, fan(s))
All the hydraulic arrangements are situated on one same face (following the connection indicated in the
order)
Foresee an access from the two sides for the Mistral M60 model to the fan section in order to access to
each fan.
4.2. Handling
Depending on the unit configuration at the delivery, the handling is carried out by support frame or
suspension fixation, or by delivery pallet.
Pallet configuration
Use forks enough long that can pass under the depth of the pallet.
The center of gravity and the load distribution have to be taking into account.
Rail support/ Hangers configuration
Only use adapted and authorized lift system.
Fasten the lift system to the extremity of the rail support or to hangers
Be careful to the center of gravity during the lifting to avoid sliding or tipping of the load.
The angle formed by the lifting cable and the load do not be inferior to 45°
Move the unit with precaution and avoid abrupt movements
The device doesn’t be fitted brutally or suffer shocks.
No additional load can be lifting with the unit.
MISTRAL M20-M30 M40-M50 M60
A 926 1376 1826
B 975 1425 1885
(Space for maintenance)

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4.3. Ceiling installation
Use a forklift to facilitate the installation of the unit to the ceiling.
Do not handle the device using at the same times pipes or valves as well as the condensate drain pan.
The edges are sharped; carry safety gloves for this operation
Check there is no fragments inside the pipework; it could deteriorate the mini AHU at the starting.
Check also that the surface using as a support (ceiling, wall, floor...) is perfectly flat.
Raise the unit carefully, holding it by its suspension edges.
Fasten the mounting clips (not supplied) with a diameter maximum of 8 mm in the ceiling regarding the
gap of fixation clips (clips are realized with slotted holes to permit a final adjusting). To achieve this, it is
recommended to use a template. The mounting clips and its anchoring system must be adapted to the
nature of the support and all of those have to support the weight of the unit. Introduce the mounting clips
in the fixing holes, add anti vibration rubber / washers / nuts et counternuts (accessories not supplied)
without tighten
Put up the unit horizontally with a spirit level adjusting the nuts and counternuts of threaded mounting
clips. Then, create a slight slope of minimum 2% toward the output of the condensate drain pan in order
to make easier the runoff (Mistral M20 and M30 slope of 5 mm, Mistral M40 and M50, slope of 7 mm,
Mistral M60 slope of 10 mm)
Ensure that when the unit is installed, it has a slight slope (2%) favoring the evacuation of condensates.
A reverse slope would result of a stagnation of water, even an overflowing of the pan
4.4. Floor installation
Handle the unit using the rail support (see the handling section)
Do not handle the device using at the same times pipes or valves as well as the condensate drain pan.
The edges are sharped; carry safety gloves for this operation.
Check there is no fragments inside the pipework; it could deteriorate the mini AHU at the starting.
Check also that the surface using as a support is perfectly flat.
In the case that devices are equipped with a condensate output, it is essential that the height of the
support match at least with the required height of the siphon.
Secure the device to the floor using the oblong holes present on the rail supports.
Ensure that when the unit is installed, it has a slight slope (2%) favoring the evacuation of condensates.
A reverse slope would result of a stagnation of water, even an overflowing of the pan.

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4.5. Vertical installation
When the mini AHU Mistral is in a vertical mounting configuration, is provided with 2 or 3 rail supports (based on
the size of the casing). Those fixations must have to be used for the fulfillment of the supporting and the fixation of
the units on the wall.
All the layout of the Mistral’s operating instructions manual remains applicable.
Check that the mechanical resistance and rigidity of the support or the wall is enough for the weight of the unit or
casing that have to be supported.
The fixations used (no supplied) for anchoring the support frame on the wall, must have to be selected in order to
could taking back the integrality of the weight of the device(s).
The weight of each unit or casing must be taking back by:
Long casing (1050mm)
3 frail supports delivered assembled on the unit
1 fixation at the extremity of each rail support which means 6 fixations in total.
Fixation by threaded rods (or equivalent) M8 mini
Short casing (525mm)
2 rail supports delivered assembled on the unit
1 fixation at the extremity of each rail support which means 4 fixations in total.
Fixation by threaded rods (or equivalent) M8 mini
In addition to the fixation system by rail support, it is necessary to take over the weight of the unit on the front of
the device, using riveted brackets mounting provided for that purpose.
The brackets permit a fixation by threaded rods (M8 o M10). The rods will be hanged or put on the floor to be
used as a support (in all cases, ensure to maintain the accessibility to the filters).
The fitting of the brackets will be made in order to obtain the horizontality of each casing and a correct alignment
of casings among each other.
In the case there are multiples units or casings, it will be imperatively to make the previous operation casing by
casing.

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4.6. Outdoor installation
Choose the place of the installation in order that the fresh air intake doesn’t be oriented toward the
direction of the wind. In areas where there is a lot of snowfall, the place of the installation must be
chosen in order that the snow doesn’t damage the good functioning of the device. The height of the
support must be adapted following those data.
If the device is mounted on the roof, you must ensure before the allowed pressure of the roof and the
frame.
The installation on the ground must permit a correct evacuation of the rainwater
The use of the unit in outdoor configuration requires the roof mounting in order to protect the device
against bad weathers.
All panels which composed the roof are delivered not mounted but as a kit of elements to assemble on
the box of the main unit and on the additional boxes.
4.7. Roof mounting
Take off the protective film of sheet metals.
Install the different sheet metals of the roof over
the unit. Check that the roof overflows
sufficiently the cover of the unit and the
accessories.
The assembly of sheet metals is executed
thanks to self-tapping screws which are
supplied, with a maximum gap of 15cm
between each screw. Put a sealing washer
under each screw.
Staunch the covering and the bond of the
panels. An insufficient impermeability can lead
to a water infiltration in the unit and consecutive
damages. Ensure the impermeability of each
element, especially at the entrance of wiring or
coil connections.
4.8. Assembly of units and accessories
The units and accessories are destined to be assembled by the interior at the junction frame. That’s why it is
necessary to dismount some panels to access to the fixation points.
Do not take off all panels in the same time, to preserve the rigidity of the unit.
Put the adhesive seal on the casing of the main unit or on the casing of the accessory.
Bring casings as much as possible to each other. Before the assembly (do not use the heat exchanger
connectors or the condensate drains to push or pull the units).
Assemble casings to each other thanks to the fastenings supplied at the different fixing points.
Put the panels back together

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4.9. Assembly of flexible flanges
Mini AHU Mistral cannot be used to support the duct and/or support mechanical constraints by third. To avoid
theses constraints it is necessary to use flexible flanges.
Aircalo(s flexible flange is delivered as a kit form.
The kit includes :
1 flexible flange
8 bars (galvanized)
(4 shorts + 4 longs)
Remark : assemble one side first, and after the other side
Slide the long bar into the corresponding
openings on the flexible flange. These must be
oriented flat face side mounting face on the
center. The part with the rounded fold longer be
outside flexible flange.
Slide the short strips into the corresponding
openings on the flexible flange.
Warning: the bar must be selected so that its end
profile can be incorporated into that of the long
bar to form a rigid angle. Present short bar with
long bar in each corner and check their
compatibility.
Points de fixatio
n
Fixation points
Gasket

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Using a mallet , insert the bars in each corner
them until complete locking
Do the same for the opposite side of the flexible flange. Finally, we must obtain a cuff meeting following
the photo below
When the flexible flange was assembled, fix one side against the frame of the Mistral and the other side
against the duct. The assembly is made flanges 2 sides.
Please note that the flexible flange must not be attached to the frame of Mistral (white painted steel).
Fixing is by self-drilling screws with a maximum spacing of 10 cm between each screw. Put a screw in
each corner of the flexible flange. There are no pre-holes in the galvanized steel frames of the Mistral.
The flexible flange should not be tensioned (risk of tearing) and it must not support the mechanical stress
At the end of the installation, check the tightness.
5. Hydraulic connection
5.1. Coils connection
Taille M20-M30 M40-M50 M60
Coil 2 rows Male 15 x 21 Male 20 x 27 Male 20 x 27
Coil 4 rows Male 20 x 27 Male 26 x 34 Male 26 x 34
Coil 6 rows Male 26 x 34 Male 33 x 42 Male 33 x 42
Operating limits
Maximum allowable pressure: 8 bar
Minimum ambient air temperature: 5°C, maximum: 32°C