Stulz Mini-Space DX CCD51A User manual

IT Cooling Solutions
Index G20
Issue 1.2017
Mini-Space DX
Precision Air Conditioning Units
380-415/3/50
Original instructions

2/01.2017/G20EN
Contents
1. Safety ...........................................................................................................................3
1.1 Marking ..............................................................................................................................................3
1.2 Safety instructions .............................................................................................................................3
1.3 Handling refrigerants .........................................................................................................................3
1.4 Safety and environmental requirements ............................................................................................4
2. Residual risks .............................................................................................................5
3. Transport / Storage .....................................................................................................7
3.1 Delivery of units .................................................................................................................................7
3.2 Transport ............................................................................................................................................7
3.3 Storage ..............................................................................................................................................7
4. Description ..................................................................................................................8
4.1 Type code ..........................................................................................................................................8
4.2 Intended use ......................................................................................................................................9
4.3 Function of the A/C unit .....................................................................................................................9
5. Technical data ...........................................................................................................10
5.1 Application limits ..............................................................................................................................10
5.2 Technical Data .................................................................................................................................12
5.3 Dimensional drawings .....................................................................................................................13
6. Installation .................................................................................................................14
6.1 Positioning .......................................................................................................................................14
6.2 Opening the A/C unit .......................................................................................................................15
6.3 Connection of the piping ..................................................................................................................15
6.3.1 Refrigerant piping (A units) .......................................................................................................15
6.3.1.1 Design ..............................................................................................................................15
6.3.1.2 Position of the refrigerant connections .............................................................................16
6.3.1.3 Filling the refrigerant circuit ..............................................................................................20
6.3.2 Water piping .............................................................................................................................21
6.3.3 Condensate drain connection ...................................................................................................25
6.4 Electrical connection ......................................................................................................................26
7. Commissioning .........................................................................................................27
8. Maintenance ..............................................................................................................29
8.1 Safety instructions ...........................................................................................................................29
8.2 Maintenance intervals .....................................................................................................................29
8.3 Refrigerant circuit ............................................................................................................................30
8.4 Air circuit ..........................................................................................................................................31
8.5 Water circuit .....................................................................................................................................32
8.6 Unit in general .................................................................................................................................32
8.7 Competences ..................................................................................................................................32
9. Malfunction ...............................................................................................................33
10. Dismantling and disposal ......................................................................................34
11. Contents of the CE Declaration of Conformity ....................................................35
12. Options
Subject to technical modifications.

/07.2016/DX 3 EN
1.2 Safety instructions
General
These operating instructions contain basic information which is to be complied with for installation, operation and
maintenance. They must therefore be read and complied with by the fitter and the responsible trained staff/operators
before assembly and commissioning. They must be permanently available at the place where the system is used.
This cooling unit contains fluorinated greenhouse gas covered by the Kyoto protocol.
In STULZ units the refrigerant R407C (R410A in units with EC compressor) is used as standard. Refrigerants are
volatile, or highly volatile fluorinated hydrocarbons which are liquefied under pressure. They are incombustible and
not hazardous to health when used as intended.
- Works have to be carried out by competent staff only
- Observance of the regulations for accident prevention
- Stay out of danger when lifting and setting off the unit
- Secure the unit to avoid the risk of overturning
- Safety devices may not be bypassed.
- Respect the corresponding VDE-, EN- and IEC standards for the electrical connection of the unit
and observe the conditions of the power supply companies
- Switch off the voltage from the unit when working on it.
- Observe the national regulations of the country where the unit will be installed
- The refrigerant circuit contains refrigerant and refrigerating plant oil, observe professional dis-
posal for maintenance and when setting the unit out of service.
- Cooling water additives have an acidic effect on skin and eyes, wear safety glasses and safety
gloves
- Observe personal protective equipment when working on the refrigerant circuit.
- The unit may only be used to cool air according to the Stulz specification.
- Respect material compatibility in the whole hydraulic circuit.
- The male triangular wrench is to be placed in a visible location in the immediate vicinity of the
unit.
1.3 Handling refrigerants
According to EN 378, refrigerants are divided in groups in respect of health and safety: R407C and R134a belong
to Group L1.
- Adherence to the regulations by law and guide-lines
- Execution only by competent staff
1. Safety
1.1 Marking
Danger - threatening danger, grievous bodily harm and death
Attention - dangerous situation, light bodily injury and material damage
Information - important information and application notice
ESD note - risk of damaging electronical components

4/07.2016/DXEN
- Responsability for correct disposal of refrigerant and system parts is incumbent on the operator.
- Refrigerants have a narcotic effect when inhaled in high concentrations.
- The room is to be evacuated immediately if high concentrations of refrigerant suddenly occur. The room may only
be entered again after adequate ventilation.
- If unavoidable work is required in the presence of a high concentration of refrigerant, breathing apparatus must
be worn. This does not mean simple filter masks. Comply with breathing protection data sheet.
- Safety glasses and safety gloves are to be worn.
- Do not eat, drink or smoke at work.
- Liquid refrigerant must not get onto the skin (risk of burns).
- Only use in well ventilated areas.
- Do not inhale refrigerant vapours.
- Warn against intentional misuse.
- It is absolutely essential to comply with the first aid measures if accidents occur.
- Refrigerants containing FCs contribute to the global warming and with this to climate changes. The FCs must
therefore be disposed of in accordance with the regulations, i.e. only by companies specially qualified and licensed
as recognised disposal companies for refrigerants.
1.4 Safety and environmental requirements
The following requirements relate to the operation of refrigerating plants within the European Community.
- The used components must correspond to the pressure equipment guide-line EC/97/23 and EN 378 part 1-4.
- Independent of the design, the equipment and inspection before the delivery, also the operator of such plants has
duties according to EN 378 and national regulations.
This concerns the installation, the operation and the repeated inspection:
- Installation: according to EN 378
- Operation: Determination of emergency measures (accidents, malfunctions)
Creation of an abbreviated instruction and notification (template page)
a. A unit protocol must be kept.
b. To be stored in the proximity of the unit
c. Access for competent staff in case of repairs and repeated inspection must be ensured.
- Repeated inspection: according to EN 378
The operator is responsible for the execution.
The operator must ensure that all maintenance, inspection and assembly work is carried out by authorised and
qualified specialist staff who have made an in-depth study of the operating instructions.
It is absolutely essential to comply with the procedure for shutting down the system described in the operating in-
structions. Before maintenance work, the unit must be switched off at the main switch and a warning sign displayed
to prevent unintentional switching-on.
Independent conversion and manufacture of replacement parts
The system may only be converted or modified after consultation with STULZ. Original replacement parts and re-
placement parts/accessories authorised by STULZ are an aid to safety.
Unacceptable operating methods
The operating safety of the system is only guaranteed when it is used as intended. The limit values stipulated in the
technical data must not be exceeded under any circumstances.

/07.2016/DX 5 EN
Transport, Installation
Area Cause Danger Safety note
Under the unit Defective lifting device Bruising Keep away from under the unit
Beside the unit Uneven or insufficient
foundation or raised floor
stand
Bruising by tipping
over of the unit
Make sure, the foundation is even
and stable and that the raised floor
stand is correctly mounted. Wear
protective equipment (helmet,
gloves, safety shoes).
In the lower part of
the unit
Heat by soldering flame,
sharp edges, built-in parts
Burns, cuts, concus-
sion damage
Wear safety glasses and gloves,
don't put your head into the unit.
Electrical box Connection cable under
voltage, sharp edges of
the openings for the cable
introduction
Electric shock, cable
damage at positioning
Check and make sure the unit is de-
energized. Stand on isolated ground.
Take care that sharp edges are al-
ways protected by rubber grommets
Start-up
Area Cause Danger Safety note
In the lower part of
the unit, refrigerant
piping
Defective filling line for
refrigerant, leaks in the
refrigerant piping, closed
stop valves, defective
safety valve
Discharge of refrigerant
under high pressure,
burns in case of contact to
the skin, formation of acid
vapours with open flames
Open stop valves.
Wear safety glasses and
gloves, don't put your head
into the unit.
In the lower part
of the unit, water
piping
Leaks in the water lines,
closed stop valves
Discharge of water under
high pressure, contact with
the skin of ethylen glycol, irri-
tation of eyes and respiratory
system by glycol vapours,
increased risk of electric
shock in combination with
electricity, risk of slipping
Open stop valves.
Wear rubber gloves, ethylen
glycol is absorbed by the
skin. Avoid swallowing water
with glycol additives.
Fan outlet of up-
flow units
Small parts fallen into the
fan
Small parts can be thrown
out of the fan when the unit
starts.
Keep away from above the
fan outlet.
Electrical box Short circuit Electric arc, acid vapours Retighten terminal connec-
tions,
Wear protective gloves
2. Residual risks

6/07.2016/DXEN
Operation
Area Cause Danger Safety note
In the lower part of
the unit, refrigerant
piping
Leaks in the refrigerant
piping, defective safe-
ty valve/high pressure
switch, fire
Discharge of refrigerant under
high pressure, explosion of
pipe sections, formation of acid
vapours with open flames
In case of fire wear pro-
tective mask.
Unit bottom, even-
tually raised floor
Accumulation of conden-
sate and water discharge
by too small or clogged
drain pipe
Corrosion and development of
mould by moistness.
Humidity in combination with
electric connections.
De-energize water dis-
charge area.
Electrical alimen-
tation
Falsely dimensioned cab-
les or protection devices
Short-circuit, fire, acid vapours Correctly design alimen-
tation cables and pro-
tection elements. Wear
protective mask.
Maintenance
Area Cause Danger Safety note
In the lower part of
the unit, refrigerant
piping
Leaks in the refrigerant
piping, defective safe-
ty valve/high pressure
switch.
Discharge of refrigerant
under high pressure,
burns in case of contact to
the skin, formation of acid
vapours with open flames
Wear safety glasses and
gloves, don't put your head
into the unit.
Pressure lines,
compressor, reheat
behind heat ex-
changer
Heat Burns in case of contact to
the skin
Wear safety gloves. Avoid
contact to hot unit parts.
Heat exchanger Sharp edges, fins Injuries by cutting Wear safety gloves.
Steam humidifier Discharge of steam Burns Avoid area around the steam
lance.
Electrical box Live components, sup-
posed to be voltage-free.
Electric shock Secure master switch against
being switched on again.
Dismantling
Area Cause Danger Safety note
In the lower part of
the unit, refrigerant
piping
Soldering off or cutting
the refrigerant pipes still
under pressure.
Discharge of refrigerant
under high pressure,
burns in case of contact to
the skin.
Depressurize pipes before
disconnecting them.
Wear safety glasses and
gloves, don't put your head
into the unit.
In the lower part
of the unit, water
piping
Unscrewing the water
pipes still under pressure.
Discharge of water under
high pressure, contact with
the skin of ethylen glycol, in-
creased risk of electric shock
in combination with electrici-
ty, risk of slipping
Drain of cooling water by
drain valve.
Wear rubber gloves.
Electrical box Live electrical alimentati-
on cable
Electric shock Check de-energized state
of the alimentation before
dismantling,
Wear safety gloves.

/07.2016/DX 7 EN
Unit version A: The refrigerant circuit is filled with nitrogene up to 2.5 - 5.0 bar.
Unit version G: The refrigerant circuit is filled with refrigerant ready for use.
3. Transport / Storage
3.1 Delivery of units
Stulz A/C units are mounted on pallets and packed several times in plastic film. They must always be transported
upright on the pallets.
When delivery is accepted, the unit is to be checked against the delivery note for completeness
and checked for external damage which is to be recorded on the consignment note in the presence
of the freight forwarder.
• The delivery note can be found on the A/C unit when delivered.
• The shipment is made ex works, in case of shipment damages, please assert your claim towards
the carrier.
• Hidden damage is to be reported in writing within 6 days of delivery.
The following information can be found on the packing.
1) Stulz logo
2) Stulz order number
3) Type of unit
4) Packing piece - contents
5) Warning symbols
also upon request
6) Gross weight
7) Net weight
8) Dimensions
9) Customer order number
10) Additional customer requirements
Construction of protective covering
(from inside to outside)
1. Neopolene cushioning
2. Shrink film
3. Additional board in container shipments
3.2 Transport
The Stulz A/C units can be moved by lifting devices with ropes, for this the ropes have to be fixed at the pallet, and
the upper unit edges have to be protected by wooden laths or metal brackets in such a way that they could not be
caved in.
You can move the unit still packaged on the pallet with a fork lift, if you take care that the centre of gravity is within
the fork surface. Take care that the unit is in an upright position at the transport.
3.3 Storage
If you put the unit into intermediate storage before the installation, the following measures have to be carried out to
protect the unit from damage and corrosion:
• Make sure that the water connections are provided with protective hoods. If the intermediate storage exceeds 2
months, we recommend filling the pipes with nitrogen.
• the temperature at the storage point should not be higher than 42°C, and the site should not be exposed to direct
sunlight.
• the unit should be stored packaged to avoid the risk of corrosion especially of the heat exchanger fins.
Never move the unit on rollers and never transport it without pallet on a fork lift, for the risk of
distorting the frame.

8/07.2016/G20
C C D 9 1 A
A, G
1
D, U - Downflow, Upflow
CC = Compact Clima
STULZ GmbH
Klimatechnik
Holsteiner Chaussee 283
22457 Hamburg
Tel: [phone]
Fax: [phone]
B72040
CCD 91 A
---
/ 07.2016 / G20
5, 7, 9, 13, 15, 18, 22, 25
EN
Explanation
Unit variants
Product range
Airflow direction
Output of unit in kW
Number of refrigeration circuits
Cooling system:
A: air-cooled
G: water/glycol-cooled
Page code
Date of issue
month/year
Page code:
DE - German
EN - English
FR - French
ES - Spanish
PL - Polish
IT - Italian
PT - Portuguese
4. Description
4.1 Type code
The type code represents the unit variant of your A/C unit and can be found on the rating plate.
Manufacturer address:
The rating plate is located in the door in
front of the electrical compartment.
Unit type
internal part no.
Order number
+ alternative
Serial no.
EN
Index
number
Manufacturing base:
G - Germany
C - China
I - Italy

/07.2016/G20 9
CCD 51/71/91/131/151 A CCD 181/221/251 A
EN
4.3 Function of the A/C unit
4.2 Intended use
This A/C unit is used to control room temperature and air humidity. The A/C unit is designed for indoor installation.
Any use beyond this is not deemed to be use as intended.
The A/C unit is exclusively operated by the controller in the front panel and the main switch in the electric box.
In the air inlet a temperature/humidity sensor is located which provides the measured values for the temperature/hu-
midity control. The cooling is achieved by compressor operation in the refrigerant circuit.
The A/C unit control is effected by the on board I/O controller. The operational conception is designed such as to
allow to control up to 19 units from one unit. These units can be installed separately with a maximum control line
length of 1000 m.
Dehumidification
A dehumidification is achieved by a reduction of the air flow. With a constant cooling capacity, the temperature of
the air which flows through the heat exchanger coil, passes below the dew point. The moisture contained in the air
condenses on the heat exchanger gathers in the condensate pan and is carried away by the drain.
Expansion valve
Sight glass
HP switch
LP switch
Temp./humidity
sensor
Fire detector
(option)
Smoke detector
(option)

10 /07.2016/G20EN
5.1 Application limits
- Admissible return air conditions:
Temperature:
Lower limit: 18°C
Upper limit: 35°C
Humidity:
Lower limit: 5,5°C dew point
Upper limit: 60% r.h. and 15°C dew point
- Outdoor ambient conditions:
lower limit: –10°C, depending on selected option
down to –45°C
upper limit: depending on selected condenser
- Storage conditions:
Temperature [°C]: –20 - +42
Humidity [% rel. h.]: 5 - 95
Atmosphere pressure [kPa]: 70 - 110
- Cooling water pipes:
max. water head pressure: 16 bar
- Required min thermal load:
20% of nom. cooling cap.
- Hot water conditions for optional heating coil:
max. inlet water temperature: 110°C
max. water head pressure: 16 bar
- Max. length of piping between A/C unit and air-
cooled condenser: 30 m equivalent.
- Max. level difference between condenser and
A/C unit: 5 m (when condenser is below the
A/C unit).
5. Technical data
- Voltage: 380 - 415V / 3ph / 50Hz; N; PE
- Voltage tolerance: +/- 10%
(not for permanent operation)
- Frequency tolerance: +/- 1%
The following voltages are also available for this A/C
unit series:
200V/3Ph/50Hz; PE
(only for 41, 61, 81, 121, 171, 201)
208V/3Ph/60Hz; PE
230V/3Ph/60Hz; PE
380V/3Ph/60Hz; N; PE
460V/3Ph/60Hz; PE
Other voltages on request.
Voltage/frequency tolerances as for 400V/3Ph/50Hz.
The cooling capacity, air flow, water flow, pressure loss,
sound pressure level and valve sizes change with a vol-
tage different from the standard voltage (400V/3Ph/50
Hz). In this case, see the technical data by the help of
the "Stulz Select" planning tool.
The unit design, the external dimensions, the weight,
the position and size of the supply connections are
independent of the supply voltage and can be found in
this manual.
Requirements for UPS systems:
(in case of permanent operation of the EC fans with a
UPS system)
- the output voltage of the UPS system must be grounded
neutral (wye).
- the voltage distortions must be within the limits stated
below and no inadmissibly high DC voltage portions
may exist.
- all-pole sinus filters must be provided at the UPS
system output.
transient peak over-voltage phase to ground:
max. 4 kV (1,2/50µs wave form; Z=12 Ohms in acc. to
ANSI)
transient peak over-voltage phase to phase:
max. 2 kV (1,2/50µs wave form; Z=2 Ohms in acc. to
ANSI)
ripple voltage phase to ground: dV/dt < 1V/µs (≡1000V/ms)
voltage harmonics: THD(V) < 8%
The warranty is invalidated for any possible damage or
malfunction that may occur during or in consequence of
operation outside the application ranges.

/07.2016/G20 11
R407C R134a
bar 1,0 1,0
bar 3,0 3,0
bar 24,5 18,0
bar 18,0 14,0
bar 28 28
EN
Design conditions for technical data:
Electrical connection:
external static pressure for Downflow units:
external static pressure for Upflow units:
Return air conditions for evaporator capacity:
Cooling fluid (G):
Fluid inlet temperature:
Fluid outlet temperature:
Condensation temperature:
400V / 3ph / 50Hz
20 Pa
50 Pa
24°C, 50% rel. humidity
Water, 30% ethylen glycol
30°C
40°C
45°C
The sound pressure levels are valid at a height of 1m and distance of 1m in front of the unit under free field conditions
and with nominal data. The values take into account the effects of all installation and design parts contained in the
standard unit. The values for upflow units assume an installed discharge duct.
Adjustment of the pressure switches:
LP switch:
releases at:
automatic reset at:
HP switch:
releases at:
manual reset possible at:
Safety valve:

12 /07.2016/G20
Modell 51 71 91 131 151 181 221 251
DX-Kälteleistung R407C total
24°C/50% r.F. sensibel kW 6,4 6,4
7,5
7,5
9,6
8,3
12,1
11,1
13,8
11,9
18,1
18,1
21,9
21,9
26,0
24,1
Auslegungsfüllmenge R407C G dm³ 2,4 2,4 2,4 2,6 3,0 3,2 3,4 3,6
Wasservolumenstrom G m³/h 0,8 1,0 1,2 1,5 1,8 2,2 2,7 3,2
Druckverlust Kondensator G kPa < 1 1 1 2 2 19 28 38
Ventilgröße (3-Wege) (Option) Zoll 1/2 1/2 1/2 3/4 3/4 1 1 1
Druckverlust Ventil kPa 9 12 19 8 11 6 10 12
Luftvolumenstrom m³/h 2500 2500 2500 3500 3600 7000 7000 8000
Rückluftfilterklasse G4 G4 G4 G4 G4 G4 G4 G4
Downflow
Schalldruckpegel (1 m Freifeld) dBA 49,3 49,3 49,3 57,1 57,7 57,7 57,7 60,2
Gewicht - A kg 136 138 141 141 151 276 279 282
Gewicht - G kg 145 147 150 150 160 283 286 289
Upflow
Schalldruckpegel (1 m Freifeld) dBA 52,0 52,0 52,0 59,5 60,1 59,4 59,4 62,5
Gewicht - A kg 147 149 152 152 163 297 300 303
Gewicht - G kg 156 158 161 161 172 304 307 310
Baugröße 31 2
CCD/U ... A/G
EN
5.2 Technical Data
* For electrical data, (compressor and fan power consumption) see e-data sheet.
Type
DX-cooling cap. R407C total
24°C/50% r.h. sensible kW
Nominal refrigerant charge, G kg
Water flow G m³/h
Pressure loss, condenser G kPa
Valve size (3-way) (option) inch
Pressure loss, valve kPa
Airflow m³/h
Return air filter class
Downflow
Sound pressure level (1m free field)
dBA
Weight - A
kg
Weight - G
kg
Upflow
Sound pressure level (1m free field)
dBA
Weight - A
kg
Weight - G
kg
Cabinet size 3

/07.2016/G20 13 EN
5.3 Dimensional drawings
Cabinet size 1
Cabinet size 2

14 /07.2016/G20
0,5m
1100 mm
1500 mm
1300 mm
700 mm
EN
6. Installation
6.1 Positioning
Check that the installation site is appropriated for the unit weight, which you can read in the technical data.
The A/C unit is designed for the inside installation on a level base. The solid base frame contributes significantly to
an even weight distribution. When selecting the installation site take into account the necessary clearances for the
maintenance and the air flow.
Children, unauthorized persons and animals may not have access to the installation site of the A/C unit.
Vibrations emanate from the A/C unit due to compressor operation. To avoid such vibrations, install the unit on a
vibration absorbing base, as it is realized in case of a positioning on a raised floor socket e.g. by Mafund strips.
Use a vibration absorbing base for upflow units also.
Do not operate the A/C unit in office rooms or other rooms sensitive to noise.
Maintenance
clearance
Air intake area for Downflow units and air
outlet area for Upflow units without duct
connection
The unit may not be operated in an explosive atmosphere!
Size 1 Size 2
Maintenance clearance

/07.2016/G20 15 EN
6.2 Opening the A/C unit
The A/C unit is opened by opening the elec-
trical compartment door and by removing
two front panels
The panel in front of the low temperature sec-
tion is secured by ball pins and can be remo-
ved without auxiliary equipment. To remove
the front panel in front of the air section, first
open the electrical compartment door using
the male triangular wrench provided.
All maintenance measures can be performed
from the open front of the A/C unit.
6.3 Connection of the piping
6.3.1 Refrigerant piping (A units)
To design the piping between the A/C unit and the condenser follow the instructions in chapter "2. Refrigerant piping"
of document "General-DX". This document is available in the e-Stulz area.
6.3.1.1 Design

16 /07.2016/G20
Gerät 51 71 91 131 151
Druckleitung mm 12 12 12 16 16
Flüssigkeitsleitung mm 10 10 10 10 10
Gerät 51 71 91 131 151
Druckleitung
Px 419 419 419 414 401
Py 224 214 252 266 263
Pz 247 247 247 248 236
Flüssigkeitsleitung
Lx 520 520 520 514 514
Ly 214 214 214 215 215
Lz 224 224 224 222 222
Ly
Py
Px
Pz
Lx
Lz
32 126 46 144 46 146 32
x
z
y
Downflow - CCD 51/71/91/131/151 A
EN
6.3.1.2 Position of the refrigerant connections
Refrigerant line connection
The refrigerant connections are located near the compressor and are la-
belled by the inscriptions "pressure pipe" and "liquid pipe". The lines to be
connected have to be soldered.
Section A-A
Rear view: Front view:
In general the pipes of downflow
units are routed through the raised
floor out of the unit. However you can
route them through openings in the
right side panel. See the position and
dimension of the openings in the right
drawing. The point of reference is the
right, rear corner below.
All dimensions in mm.
Unit
Pressure line mm
Liquid line mm
Unit
Pressure line
Px
Py
Pz
Liquid line
Lx
Ly
Lz

/07.2016/G20 17
Gerät 51 71 91 131 151
Druckleitung mm 12 12 12 16 16
Flüssigkeitsleitung mm 10 10 10 10 10
Gerät 51 71 91 131 151
Druckleitung
Px 296 296 296 293 297
Py 198 208 235 255 281
Pz 304 304 304 321 325
Flüssigkeitsleitung
Lx 244 244 244 241 245
Ly 214 214 214 215 215
Lz 288 288 288 288 288
Px
Pz
Lx
Lz
x
z
y
Ly
Py
AA
Upflow - CCU 51/71/91/131/151 A
EN
Refrigerant line connection
The refrigerant connections are located near the compressor and are la-
belled by the inscriptions "pressure pipe" and "liquid pipe". The lines to be
connected have to be soldered.
Section A-A
Rear view: Front view:
The pipes of upflow units are routed
through openings in the right side
panel. See the position and dimension
of the openings in the right drawing.
The point of reference is the right, rear
corner below.
All dimensions in mm.
Unit
Pressure line mm
Liquid line mm
Unit
Pressure line
Px
Py
Pz
Liquid line
Lx
Ly
Lz

18 /07.2016/G20
Gerät 181 221 251
Druckleitung mm 16 16 16
Flüssigkeitsleitung mm 16 16 16
Gerät 181 / 221 251
Druckleitung
Px 561 566
Py 115 110
Pz 222 288
Flüssigkeitsleitung
Lx 766 771
Ly 88 87
Lz 278 286
Ly
Py
Px
Pz
Lx
Lz
52 187 50 148 50 251 52
x
z
y
55 70 70
120 70
2 x 50
4 x 32
AA
Downflow - CCD 181/221/251 A
EN
Refrigerant line connection
The refrigerant connections are located near the compressor and are la-
belled by the inscriptions "pressure pipe" and "liquid pipe". The lines to be
connected have to be soldered.
Section A-A
Rear view: Front view:
In general the pipes of downflow units
are routed through the raised floor out
of the unit. However you can route
them through openings in the left side
panel. See the position and dimension
of the openings in the right drawing.
The point of reference is the left, rear
corner below.
All dimensions in mm.
Unit
Pressure line mm
Liquid line mm
Unit
Pressure line
Px
Py
Pz
Liquid line
Lx
Ly
Lz

/07.2016/G20 19
Gerät 181 221 251
Druckleitung mm 16 16 16
Flüssigkeitsleitung mm 16 16 16
Gerät 181 / 221 251
Druckleitung
Px 560 560
Py 119 119
Pz 235 282
Flüssigkeitsleitung
Lx 765 765
Ly 96 96
Lz 279 279
Ly
Py
Px
Pz
Lx
Lz
x
z
y
55 70 70
120 70
2 x 50
4 x 32
A A
Upflow - CCU 181/221/251 A
EN
Refrigerant line connection
The refrigerant connections are located near the compressor and are la-
belled by the inscriptions "pressure pipe" and "liquid pipe". The lines to be
connected have to be soldered.
Section A-A
Rear view: Front view:
The pipes of upflow units are routed
through openings in the left side pa-
nel. See the position and dimension
of the openings in the right drawing.
The point of reference is the left, rear
corner below.
All dimensions in mm.
Unit
Pressure line mm
Liquid line mm
Unit
Pressure line
Px
Py
Pz
Liquid line
Lx
Ly
Lz

20 /07.2016/G20
PS- PS+
24V
Komponenten CC.. 51 - 91 A CC.. 131 - 151 A CC.. 181 A CC.. 221 - 251 A
Verdampfer dm³ 3,48 4,28 8,42 8,62
Sammler dm³ 1,5 1,5 5,3 5,3
EN
- Systems without refrigerant receiver or sight glass must always be filled according to weight.
- Systems with refrigerant receiver should be filled according to weight but can also be filled by checking the sight
glass.
If you use the refrigerant R407C, please note that R407C is a ternary blend. Take care that you add
refrigerant in a liquid state, as the ratio of the refrigerant components changes if one of the three
compounds passes over into the gaseous phase.
- Before the system is filled with refrigerant, it must be clean and dry inside. (Refer to evacuation instructions).
Then proceed as follows:
The standing refrigerant bottle is connected to the suction side via a pressure gauge station. The weight is noted
shortly before filling. The specified amount of refrigerant is now added when the system is operating. During
filling the
pressure in the refrigerant bottle will adjust to that of the system. Filling is then no longer necessary.
This can be seen by the icing up of the bottle or by checking the pressure gauge. The bottle valve must then be
closed until a pressure increase has taken place which is above the suction pressure of the system. This pro-
cess can be accelerated if the bottle is wrapped in hot moist towels or it is placed in a water bath at a maximum
temperature of 50°C.
Never heat up the refrigerant bottle with a naked flame as there is a risk of explosion.
6.3.1.3 Filling the refrigerant circuit
Compressor
Condenser
Receiver
Safety valve
Solenoid valve
to expansions
valve
to evaporator
A/C unit
external installation
Non return
valve
Open stop
valves !
for cabinet
size 2 only
for cabinet
size 1 only
1. Solder the pipe ends of the external refrigerant piping coming from the aircooled condenser to the refrigerant pipe
connections of the A/C unit.
2. Connect a 24 V AC voltage or a permanent magnet at the solenoid valve in the liquid line in order to open the
valve. The closed solenoid valve would hamper an even dispersion of refrigerant during the filling.
3. Open the stop valve and in units of size 2 the Rotalock valve on the pressure side of the compressor.
4. The refrigerant circuit is filled with a nitrogene filling under a pressure of 2.5 to 5.0 bar. Evacuate the refrigerant
circuit by the Schrader valves until approximately 0 bar.
5. Fill the refrigerant circuit by the Schrader valves with refrigerant.
6. Disconnect the voltage from the solenoid valve or remove the permanent magnet.
Components
Evaporator dm³
Liquid receiver dm³
To estimate the required refrigerant charge in advance, consider following volumes: