CIAT MAGISTER Series User manual

Instruction manual
MAGISTER
10 - 2015
NA 14.54 B

EN
EN - 1 N 14.54 B
SOMMAIRE PAGE
1 - INTRODUCTION 2
2 - RECEIPT OF GOODS 2
2.1 Checking the equipment 2
2.2 Identifying the equipment 2
2.3 Documents 3
3 - SAFETY INSTRUCTIONS 3
4 - WARRANTY 3
5 - STORAGE OF EQUIPMENT 3
6 - HANDLING 3
6.1 Weights and dimensions: 4
7 - SUPPLY AIR TYPE 5
8 - LOCATION & INSTALLATION 5
9 -
LOCATION AND MARKING OF COMPONENTS 6
10 - CONNECTIONS 9
10.1 Hydraulic connections (CW) 9
10.2 Refrigerant connections (DXA model) 10
10.3 Electrical connections 12
11 - TECHNICAL SPECIFICATIONS 15
11.1 Basic component 15
11.1.1 Control 15
11.1.2 Fan motor assembly (FMA) 15
11.1.3 Cooling Coil: CW model 17
11.1.4 Direct Expansion Coil and Refrigerant Circuit : 17
11.1.5 Filter 19
11.1.6 Standard control elements: 19
11.2 Optional components 19
11.2.1 Heating Coil 19
11.2.2 Electric heater 20
11.2.3 Humidifier 21
11.2.4 Condensate drain pump 22
11.2.5 Bases: 23
11.2.6 Plenums: 24
11.2.7 Intake damper on the vertical unit: 25
11.2.8 Optional control elements 25
11.2.9 Lon gateway 28
12 - COMMISSIONING 28
13 - MAINTENANCE 29
13-1 Filters 30
13-2 Cooling coil 31
13-3 Electric heater 31
13-4 Humidifier 32
13-5 Fans 33
13-6 Electrics box 39
14 - SERVICE INTERVALS 39
15 - OPERATING READINGS 39
Original text: English Version

EN - 2 N 14.54 B
1 - INTRODUCTION
2.1 Checking the equipment
In accordance with Article 133-3 of the French Code of Commerce, the recipient is entirely responsible for checking the condition
of the goods received.
In the event of missing items, the customer must provide the exact number of parcels delivered.
Any damaged or missing items must be specified on the delivery note in the presence of the driver before signing the delivery
note.
These comments must be confirmed to the carrier by registered letter within three business days.
The comments "conditional" and "pending unwrapping" shall have no value.
The client must unwrap the goods in the presence of the driver.
Claims must be made at the time of delivery and be described in detail.
Introduction to the range:
Magister is a range of precision close control units (temperature and humidity) that is specifically adapted to meet the needs of
premises with high heat loads or of sensitive locations (data centers, computer rooms, metrology laboratories, etc.).
The MAGISTER range is available with two types of operation:
- Chilled water (CW)
- Direct expansion (DXA) linked to two air-cooled condensers
The description of the unit is indicated using the following format:
MAGISTER X X X
Example of description: MAGISTER CW40 UNDER1 123 4
1Range
2Unit type
3Cooling capacity
4Assembly type (direction of air ow)
2 - RECEIPT OF GOODS
2.2 Identifying the equipment
Each unit has a name plate located at the bottom of the electrics box that bears an identification number. This number must be
quoted in all correspondence.
Designation/Description
30, av Jean Falconnier
01300 CULOZ (FRANCE)
Tél.: [phone]
www.ciat.com Made in France
Ref. produit/Item Nbr
An(Year) N. Serie/Serial Nbr
Fluide - Charge/Fluid - Load Froid/Cold Tension/Voltage
Intensité/CurrentRegimeBP/LP Mini
HP Maxi Chaud/Heat Poids/Weight
N° Declaration CERegime - TypeTemp. Maxi (°C)
Repere/Part
02183458/0008
7323226.333462 MAGISTER CW030 3OVER
7033238.12
2014
8
2
76
4
1
3
5
- CW: chilled water
- DXA: direct expansion
- UNDER: downwards
- OVER: upwards
1
2
3
4
5
6
7
8
Product reference
Product description
Year manufactured
Serial no. (to be quoted in all
correspondence)
Type of fluid used in the exchanger and
operating pressure.
Cooling capacity + water temperature used
- Heating capacity + water temperature used (if heating coil option)
+ usage type (2 stages or TRIAC, if electric heater option)
Cabinet information
- Supply voltage
- Max. current
- Weight of the device

EN
EN - 3 N 14.54 B
Appropriate PPE (Personal Protective Equipment)
must be worn when servicing the units
Warning
The unit must be installed and maintained by a qualified, experienced technician. Follow the operating
precautions to the letter when carrying out work on the unit. Labels have been placed on the unit to remind you
of the safety instructions. As a general rule, follow all applicable safety regulations and standards.
3 - SAFETY INSTRUCTIONS
2.3 Documents
The following documents should be inside the cabinet:
- Instruction manual
- Control manual
- Electrical diagram of the cabinet
- Key to the electrical diagram
- Dimensional drawing with connection diagram
- Additional diagrams depending on options
4 - WARRANTY
See general terms and conditions of sale.
5 - STORAGE OF EQUIPMENT
The cabinet must be stored in a dry, sealed area, away from moisture and frost. The temperature in this area must not exceed 50°C.
6 - HANDLING
The unit must be handled either with a pallet truck or using a spreader beam and slings. This operation must be carried out by
qualified personnel: refer to the information on the label affixed to the equipment.
Warning: The unit must be handled with care and kept vertical.
In all cases, the vertical unit must be raised by its base.
Handling with a pallet truck
==

EN - 4 N 14.54 B
SIZE Dimensions
H x W x D Weight (kg)
CW 40 1990 x 1190 x 890 350
CW 53 1990 x 1520 x 890 385
CW 78 1990 x 2070 x 890 545
CW 100 1990 x 2620 x 890 635
CW 115 1990 x 3000 x 890 730
Indoor unit Outdoor unit
Size Dimensions
H × W × D
Weight
(kg) Size Quantity Dimensions
H × W × D
Empty unit
weight (kg)
DXA 59 1990 x 2070 x 890 510 CD 100 2 1393 x 1543 x 1053 290
DXA 65 1990 x 2070 x 890 510 CD 120 2 1393 x 1543 x 1053 290
DXA 70 1990 x 2620 x 890 620 CD 120 2 1393 x 1543 x 1053 290
DXA 85 1990 x 2620 x 890 620 CD 150 2 1393 x 1543 x 1053 350
6.1 Weights and dimensions:
Outdoor unit: please refer to the Condenciat CD N06.130 manual
1100
2500 mini
If the unit is lifted using a spreader beam and slings:
- Protect the panels.
- First remove all the caps covering the holes for the tubing on the lower section of the equipment. (Fig. 1).
- Use tubing (Ø max. = 40mm) with a sufficient lifting capacity (see weight table).
- Use fabric slings.
Handling with a spreader beam
and slings
To be removed while handling,
then replaced once the vertical
unit is in place

EN
EN - 5 N 14.54 B
7 - SUPPLY AIR TYPE
3 supply air types:
1000 mm
1000 mm
500 mm
Fitting UNDER
Return air above
supply air underneath
You must leave space for access to the front and to the right of the unit for maintenance and installation operations.
For free air intake, there must be at least 500 mm above the unit.
8 - LOCATION & INSTALLATION
Fitting OVER
Return air on front, supply
air above except CW115
Return air underneath, supply air
above except CW115 and DXA

EN - 6 N 14.54 B
9 - LOCATION AND MARKING OF COMPONENTS
CW40 to CW100, Under Assembly
Filters
FMA
FMA access
hatch
Control valve
(cooling coil)
Humidifier
(option)
Heating coil
(option)
Control valve
(Heating coil)
Cooling coil
Electrics Box
Cooling coil
Electric heater
(option)
Additional cabinet
Drain pump (option)
Condensate drain
pump (option)
Under no circumstances should these vertical units be installed in an atmosphere that is:
- Explosive
- Flammable
- Corrosive
or dusty.
Once at the place of installation, remove the wooden blocks.
● Different configuration options are possible:
The unit can be placed directly on the floor. In this case:
The unit must be placed on a flat, smooth surface which is as level as possible (ratio of approx. one to one thousand).
The cabinet frame must rest fully on its contact surface.
The unit need not be anchored to the floor if it is operated under normal conditions.
Or on one of the following bases:
Support base, cased base with grids, cased base with damper.
(See the technical characteristics for these options in paragraph 12.2).
It should be placed on a floor that is as level as possible.
Each base comes with feet, which allow the height to be adjusted (in the event of a raised floor) and the base to be levelled
before placing the unit on top.
Before placing the vertical unit on top, an adhesive seal (supplied with the option) is to be placed on the aluminium casing frame
to ensure its tightness.
The cabinet can also come with a plenum with grids or a free-cooling plenum.
(See the technical specifications for these options in paragraph 12.2)
Before placing the plenum on the vertical unit, apply the adhesive seal (supplied with the option) to its tightness.
For some models (CW115 and DXA) and for practical reasons, when the unit is in its final position, the horizontal gussets (with
oblong stamped holes), located at the bottom of the unit, can be removed (see photo).
Horizontal
gussets

EN
EN - 7 N 14.54 B
CW40 to CW100, Over Assembly
FMA
Electrics Box
Control valve
(Heating coil)
Cooling coil
Heating coil
(option)
Control valve
(cooling coil)
Humidifier
(option)
Filters
Cooling coil
Electric heater
(option)
Condensate drain
pump (option)
Additional cabinet
Drain pump (option)
CW115, Under Assembly
Electric heater
(option)
Access
hatches
Filters
Electrics Box
Cooling coil
Control valve
FMA

EN - 8 N 14.54 B
Electrics Box
FMA
Direct
expansion coil
Expansion valve
Liquid sight glass
Solenoid valve
Tank
Humidifier (option)
FMA
access hatches
Filters
Direct
expansion
coil
Electric
heater
(option)
Additional cabinet
for pump (option) Condensate drain
pump (optional)
DXA 59 to 85, Over Assembly
Filters
Direct
expansion coil
Expansion valve
Liquid sight glass
Solenoid valve
Liquid tank
Humidifier
FMA
Electrics Box
FMA
access hatches
Condensate drain
pump (optional)
Additional cabinet
Drain pump
(option)
Electric
heater
(option)
Direct
expansion coil
DXA 59 to 85, Under Assembly
Electrics Box
Electrics Box

EN
EN - 9 N 14.54 B
Foam
panel
10 - CONNECTIONS
side plate
When following these steps, please consult the dimensional drawing and connection diagram as well as the wiring diagram found
inside the vertical unit.
10.1 Hydraulic connections (CW)
The hydraulic pipes must be routed through the plates provided for this purpose in the vertical unit frame. This is either done to
the right of the unit or directly underneath.
These plates must be drilled (water circuit + condensate draining) then refitted in place before the hydraulic pipes are routed
through them.
For the CW115 and DXA models, the pipes on the right are routed through a fixed insulated panel.
please see the dimensional drawing and connection diagram to locate the routing areas and connection positions.
CW connection diameters:
CW 40 CW 53 CW 78 CW 100 CW 115
Cooling coil
Inlet G 1"1/4 (M) G 1"1/4 (M) G 1"1/2 (M) G 1"1/2 (M) G 2" (M)
Outlet G 1"1/4 (F) G 1"1/4 (F) G 1"1/2 (F) G 1"1/2 (M) G 2" (F)
CW 40 CW 53 CW 78 CW 100
Heating coil
Inlet G 3/4" (M) G 3/4" (M) G 3/4" (M) G 3/4" (M)
Outlet G 3/4" (M) G 3/4" (M) G 3/4" (M) G 3/4" (M)
Always use two spanners when connecting or tightening the hydraulic couplings to avoid twisting the pipes and applying stress
on the welds.
To avoid the risk of condensation, the hydraulic pipes and elements must be carefully insulated.
Before insulating, check the tightness of the couplings.
Warning: The operating pressure on the chilled or hot water network must not exceed 8 bar.
Once all the connections have been made, the access holes must be sealed.
Insulated flexible connections are available on request for carrying out hydraulic connections. Ensure these are not bent too
acutely to avoid pinching the inner tube and restricting the flow of water.
Condensate drain
The condensate drain pan should include a siphon to avoid any risk of overflowing. (See position and connection diameter on
the dimensional drawing).
In these vertical units, the pan is depressed due to its position in relation to the fan motor assembly.
To enable correct drainage, the height must be equal to at least twice the unit's depression.
67
67

EN - 10 N 14.54 B
Refrigerant connection diameters
Size DXA 59
2 x CD100
DXA 65
2 x CD120
DXA 70
2 x CD120
DXA 85
2 x CD150
Indoor unit
øliquid 7/8" F 7/8" F
øgas 1"1/8 F 1"3/8 F
Outdoor unit
øliquid 7/8" M 7/8" M 7/8" M 7/8" M
øgas 1"3/8 M 1"3/8 M 1"5/8 M 1"5/8 M
Connection tube øliquid 7/8" 7/8"
Connection tube øgas 1"1/8 1"3/8
A condensate drain pump option is available (see technical specifications in paragraph 12), provided that the humidifier option
has not been requested.
If the humidifier option is selected, the discharge must not drain into the unit's drain pan. To have a single discharge for both,
connect the humidifier drain downstream of the unit's drain pan.
Warning: the condensates from the humidifier can reach 100°C.
10.2 Refrigerant connections (DXA model)
Installation precautions:
The refrigerant connections between the indoor unit and the condenser (outdoor unit) must be made by qualified personnel.
Only insulated copper refrigeration pipes must be used.
This network must be designed and constructed correctly in order to ensure the entire system operates correctly.
The pipes must be sufficiently flexible to withstand fluctuations in length, expansion and contraction. The fluid line must be angled
in order to always carry the fluid to the unit.
It is important to avoid:
• Excessive refrigerant fluid loss,
• Accumulation of oil,
• Liquid ingress into the compressor, either when operating or idle,
The pipe route must:
• Not hinder, nor be hindered by, the existing installation,
• Be protected against accidental shocks,
• Be visible in its entirety, and not be encased in plaster or concrete.
• The height differences and equivalent lengths between the indoor and outdoor unit must be in accordance with the
recommendations (see Table at the end of this paragraph)
• The pipe dimensions must ensure a minimum pressure drop, and the minimum and maximum speeds must be complied with
to ensure correct circulation of the gas and movement of the oil.
• Fit oil traps every 4 metres on the vertical columns to ensure the oil is returned to the compressor.
• Check that no contamination has fallen into the tube.
• Carry out all brazing operations using a nitrogen purge.
Please see the dimensional drawing and connection diagram to locate the routing areas and connection positions.

EN
EN - 11 N 14.54 B
Note: Electrical and refrigerant connections not supplied by CIAT.
3-ph 400V-50Hz +E power supply
Remote control + fault summary
3-ph 400V-50Hz +E power supply
3-ph 400V-50Hz +E power supply
Indoor/outdoor unit electrical
connection (ready-to-run +
outdoor unit fault report)
Intake pipes (insulated)
Liquid pipes
PRINCIPLE FOR INSTALLATION
Table of the maximum lengths for refrigerant connections
The tables below show the permitted lengths for the pipers and the corresponding maximum height difference.
The values in the tables show the reduction in cooling capacity as compared to the nominal capacity as a percentage.
Outdoor unit refrigerant connection
Refer to the instructions contained in the outdoor unit

EN - 12 N 14.54 B
10.3 Electrical connections
The electrical connections and wiring must be set up as shown on the wiring diagram included with the unit and in accordance
with applicable standards and regulations.
The unit's power supply cable must be determined according to the power of the unit, the length of the cable, the protection, and
the operating mode.
Check that the characteristics of the electrical power supply conform with the indications on the name plate.
Please ensure the unit is connected to earth, and that the power supply is always able to supply the necessary power.
▪ INDOOR UNIT electrical specifications:
TRI 400V power supply + Earth - 50Hz
Additional information concerning the refrigerating circuit characteristics is provided in paragraph 12 on
refrigerant fluid used and loads.
Total length (m)
Height difference (m)
6 20 30 40 50
00 -5 -6 -7 -8
10 - -5 -6 -7 -8
20 - -5 -6 -7 -8
25 - - -6 -7 -8
DXA 85 + 2 CD 150/7/8'' liquid line, 1''3/8 gas line
Total length (m)
Height difference (m)
6 20 30 40 50
00 -4 -5 -6 -7
10 - -4 -5 -6 -7
20 - -4 -5 -6 -7
25 - - -5 -6 -7
DXA 70 + 2 CD 120/7/8'' liquid line, 1''3/8 gas line
Total length (m)
Height difference (m)
6 20 30 40 50
00 -5 -6 -7 -8
10 - -5 -6 -7 -8
20 - -5 -6 -7 -8
25 - - -6 -7 -8
DXA 65 + 2 CD 120/7/8'' liquid line, 1''1/8 gas line
Total length (m)
Height difference (m)
6 20 30 40 50
00 -4 -5 -6 -7
10 - -4 -5 -6 -7
20 - -4 -5 -6 -7
25 - - -5 -6 -7
DXA 59 + 2 CD 100/7/8'' liquid line, 1''1/8 gas line

EN
EN - 13 N 14.54 B
Table of currents (CW)
CW 40 CW 53 CW 78 CW 100 CW 115
Fan motor assembly
Voltage (V) 400
Power (kW) 3,4 6,8 9,3
Current (A) 5,4 10,8 14,7
Control circuit (transformer) Voltage (V) 24
Current (A) 1
Humidifier (option)
Voltage (V) 400
Power (kW) 6
Current (A) 8,7
Electric heater (option)
Voltage (V) 400
Power (kW) 12 18 24 33,6 32,4 43,2
Current (A) 17,4 26 34,6 48,4 46,8 62,3
Total current without option
Current (A) 6,4 11,8 15,7
Rating of main switch (A) 16 32
Total current with humidifier
Current (A) 15,1 20,5 24,4
Rating of main switch (A) 25 40 32
Total current with electric
heater
Current (A) 23,8 32,4 46,4 60,2 62,5 78
Rating of main switch (A) 40 63 80
Total current all options
Current (A) 32,5 41,1 55,1 68.9* 71,2 86,7
Rating of main switch (A) 40 63 80 125
Table of currents (DXA)
DXA 59 DXA 65 DXA 70 DXA 85
Fan motor assembly Voltage (V) 400
Power (kW) 6,2
Current (A) 9,8
Control circuit (transformer) Voltage (V) 24
Current (A) 1
Humidifier (option)
Voltage (V) 400
Power (kW) 6
Current (A) 8,7
Electric heater (option) Voltage (V) 400
Power (kW) 18 24
Current (A) 26 26 34,6 34,6
Total current without option Current (A) 10,8
Rating of main switch (A) 16
Total current with humidifier Current (A) 19,5
Rating of main switch (A) 25
Total current with electric
heater
Current (A) 36,8 45,4
Rating of main switch (A) 40 63
Total current all options Current (A) 45,5 54,1
Rating of main switch (A) 63
▪ OUTDOOR UNIT electrical specifications:
TRI 400V power supply + Earth - 50Hz
Refer to the instructions contained in the outdoor unit

EN - 14 N 14.54 B
For the indoor unit/outdoor unit electrical connections please see the wiring diagram.
Recommendations concerning electrical connections of the indoor unit.
Connect the indoor unit so that the main power supply comes from underneath the unit.
Either on the right side of the unit (1 or 2) or from underneath (3). If using a cased base, pass it through one of the grommets on
the right side intended for this purpose (See technical characteristics in paragraph 12.2.5).
2
1
3
Then follow the routing shown in the gures below.
When wiring via management systems (CMS) or master/slave control, as well as room sensors, go through the top of the cabinet
and the top section of the box, through the grommets shown in the box views.
In all cases, avoid following the power supply cables, to avoid interference to the signals sent.
Cable routing
for management (CMS)
or room sensors.
Power supply
cable route
CW model DXA & CW115 models
• Recommendations concerning the cables and routing in the box.
For communication cables:
• BUS RS485 cable: Multiconductor cable, shielded, jacketed (shielding with braiding)
- BUS RS485 cable for MODBUS or master/slave communication.
- LON BUS cable for LON communication (see LON specification)
For room sensor cables:
• Multipolar shielded cables of 3 to 5 wires with a maximum cross section of 1.5 mm2.
Please refer to the control manual and electrical diagram for more details concerning connection.

EN
EN - 15 N 14.54 B
11.1.2 Fan motor assembly (FMA)
EC motor (electronic communication) with "plug fan" type direct drive.
Thanks to their technology, these fans have low energy consumption.
Type of FMA control:
- With µRC2.1 controls
• On CW40 to 100 cabinets: MODBUS control as the FMAs are equipped with a MODBUS card which allows the following
information to be communicated to the controls: rotation speed, current used and power input.
CIAT µ Air Connect 2
11.1 Basic component
11.1.1 Control
The vertical units are equipped with an automatic CIAT control: µAIR CONNECT2.
11 - TECHNICAL SPECIFICATIONS
All the cable routings in the unit must be sealed tight.
On the CW115 and DXA models, the vertical units are supplied with caps that must be put back on the side and front sections
of the casing.
The heart of the vertical unit, this manages the unit and ensures it functions correctly. It is incorporated into the display and is
mandatory for DXA models.
It can be connected to control systems so that the vertical unit can be controlled remotely, or to allow for master/slave control
with several vertical units.
For adjustment and configuration, refer to the corresponding manual (N09.41).
Inputs Input
CW model DXA model
Recommended
route for BUS
RS 485 cable Raceways
Raceways
Route for LON
BUS cable
LON
gateway

EN - 16 N 14.54 B
DIRECT EXPANSION
DXA 59 DXA 65 DXA 70 DXA 85
Nominal flow rate
(m³/h) 15000 15700 18500 21000
Min flow rate
(m³/h) 9000 10000 9000 12000
Table of operating pressures downstream of the filters
CW CW 40 CW 53 CW 78 CW 100 CW 115
Air ow (m3/h)
Nominal Maximum Nominal Maximum Nominal Maximum Nominal Maximum Nominal Maximum
10 000 13 300 13 300 13 300 18 800 20 500 24 500 27000 27 000 27 500
Max. operating pressure
with G4 lter (Pa) 400 171 229 229 400 400 343 157 400 400
Max. operating pressure
with F7 lter (Pa) 400 60 140 140 400 400 261 68 400 385
DXA DXA59 DXA65 DXA70 DXA85
Air ow (m3/h) 15 000 15 700 18 500 21 000
Max. operating pressure
with G4 lter (Pa) 400 400 400 355
Max. operating pressure
with F7 lter (Pa) 400 400 400 345
Nominal flow rates of cabinets:
CHILLED WATER
CW 40 CW 53 CW 78 CW 100 CW 115
Nominal flow rate (m³/h) 10000 13300 18800 24500 27000
Max. flow rate (m³/h) 13300 13300 20500 27000 27500
CHILLED WATER
CW 40 CW 53 CW 78 CW 100 CW 115
Number 11223
Max.
power (KW) 3.4 3.4 6.8 6.8 9.3
Max.
current (A) 5.4 5.4 10.8 10.8 14.7
DIRECT EXPANSION
DXA 59 DXA 65 DXA 70 DXA 85
Number 2
Max.
power (kW) 6.2
Maximum
current (A) 9.8
• On CW115 and DXA 59 to 85 vertical units: progressive 0-10V control.
- Without control (CW only)
• Progressive 0-10V control via a manual voltage potentiometer located inside the electrics box (graduated from 0 to 100%)
If the unit does not function immediately after installation, it is recommended that you run the equipment at full speed for
a minimum of one hour every three months so that condensates that have potentially entered inside can evaporate and
so that the bearings are put into motion.

EN
EN - 17 N 14.54 B
The coil is regulated by a two-way or three-way valve equipped with a 0-10V servomotor (mounted and connected)
● Coil specifications:
CHILLED WATER
CW 40 CW 53 CW 78 CW 100 CW 115
Coil (4-row coil)
Number of coils 1 1 1 1 1
Capacity (l) 11.8 15.8 21 27.4 50.8
Coil (6-row coil)
Number of coils 1
Capacity (l) 73.8
● Cooling capacity:
COOLING COIL
CW CW 40 CW 53 CW 78 CW 100 CW 115
Air ow (m³/h)
Nominal * Maximum
**
Nominal * Maximum
**
Nominal * Maximum
**
Nominal * Maximum
**
Nominal * Maximum
**
10 000 13 300 13 300 13 300 18 800 20 500 24 500 27 000 27 000 27 500
Sensible cooling capacity (kW) 40 45 55 53 78 78 100 100 127 130
* Conditions: return air 24°C 45%, water temperature 7/12°C
** Conditions: return air 26°C 40%, water temperature 10/15°C
● Flow rate and pressure drop for valve + coil:
CHILLED WATER
No. of rows CW 40 CW 53 CW 78 CW 100 CW 115
Nominal water
flow rate (m³/h)
4 rows 7.02 9.65 13.6 17.6 20.2
6 rows 24.7
KV valve 16 16 25 40 40
∆P (Pa) Valve
only (mWC)
4 rows 2 3.7 3 2 2.6
6 rows 3.9
∆P (Pa) Valve +
coil (mWC)
4 rows 6.5 9.2 9 6.9 4.9
6 rows 7.2
Maximum permitted differential pressure on cold water valve
CW40 CW53 CW78 CW100 CW115
KV 16 16 25 40 40
∆P max. Three-way valve 300 300 300 260 260
∆P max. Two-way valve 1200 1200 1000 260 260
11.1.4 Direct Expansion Coil and Refrigerant Circuit :
DXA model
The indoor and outdoor units are delivered with a nitrogen safety load. Evacuation and freon charging must be carried out by
the installer.
The refrigerant fluid used is R410A.
The sealing test must be carried out in compliance with EC regulation no. 842/2006 relating to certain greenhouse gases.
R410A type refrigerant fluid is a gas which has the following impact on the environment:
1/ No impact on the ozone layer.
2/ Impact on the greenhouse effect: GWP (Global Warming Potential) relating to each gas.
- R410A ------GWP = 2088
- Users must have systems containing refrigerant periodically checked for leaks by qualified personnel. The frequency of checks
depends on the refrigerant charge:
- Every 12 months for units containing 3 to 30 kg of refrigerant.
(2 kg in France, according to the decree and order of 7 May 2007)
Make sure that the chilled water supply pipes are insulated.
Moderately tighten the coil supply connections to avoid damaging the manifolds
11.1.3 Cooling Coil: CW model

EN - 18 N 14.54 B
6 7 8
Outdoor unit
Indoor unit
5
DXA 2 circuit schematic diagram
1-Evaporator coil
2-Thermostatic expansion valve
3-Compressor
4-Dryer filter
5-Condenser coil
6-Solenoid valve
7-Liquid sight glass
8-Liquid tank
- Every 6 months for units containing 30 to 300 kg of refrigerant.
- Every 3 months for units containing more than 300 kg of refrigerant.
(Implementation of leak detection system)
- For all systems which contain over 3 kg of refrigerant (2 kg in France), users are required to keep a log of the quantities and
types of fluids used in, added to and recovered from the system, as well as the dates and results of the sealing tests. The name
of the technician and his company must also be recorded.
- A leak test must be carried out one month after any leak repairs.
- System users are responsible for collecting used refrigerant and having it recycled, regenerated or destroyed.
The table below shows the loads to be used for each circuit
Unit/CD distance = 0 metres
DXA 59
2xCD100
DXA 65
2 x CD120
DXA 70
2 x CD120
DXA 85
2 x CD150
Load in kg per circuit
(connection = 6 metres) 12.35 10.47 10.89 12.68
Additional load
per metre 0.35 Kg/m additional tube
3
4
3
4
2
1