Viessmann FT 0700 Installation and operating instructions

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CT and FT ceiling-mounted
refrigeration units
Page 1 GB Right reserved to make technical changes! Valid 10.14
Assembly and
operation manual
6008521-01 GB
Work on the refrigeration unit is only permitted when the plug
is disconnected from the power supply. The unit must be
protected from reactivation using suitable warning signs.
Regulations VDE 0105 for work on electrical installations must
be observed.
Prior to beginning work on the refrigeration unit, please pay attention to the following:
Only a refrigeration specialist is permitted to carry out the
assembly, maintenance, and cleaning of the unit.
Technical changes are prohibited.
The guarantee is invalidated if these conditions are not kept to.

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Contents
1. Description
1.1 Deep-freeze unit
FT 0700, FT 1000, FT 1200, FT 1500
1.2 Refrigeration unit
CT 0900, CT 1200, CT 1500, CT 2000, CT 3000
2. General Notes
2.1 Extract from our general conditions of guarantee
2.2 Norms and regulations
2.3 Requirements for the room where unit is to be installed
2.4 Transport
2.5 Condition at time of delivery
2.6 Unpacking and handling
2.7 Energy savings
3. Cleaning and maintenance of the refrigeration unit
3.1 Disposal of coolant
4. Installation of the refrigeration unit
in a Viessmann coldroom
4.1 Connections for remote control
4.2 Connecting a bus line
5. Condensation drainage
6. Electrical power supply of the coldroom
6.1 Connecting the door contact switch
6.2 Connection of the fault warning contact
6.3 Connection to the power supply and activation
7. Controls
7.1 Normal operation
7.2 Input of parameters
7.2.1 Entering temperature setting
7.2.2 Entering defrosting times
7.2.3 Selecting Humidity in the coldroom
7.2.4 Selecting language of the display
7.2.5 Control lock
7.2.6 Operator access
7.3 Fault warning
7.4 Deactivation of refrigeration unit
8. Types of operational parameters
8.1 Parameter list
8.2 Description of the operational types and their
parameters
8.2.1 Defrosting
8.2.2 Condenser Fan (for units with rotational speed control)
8.2.3 Setting the parameters for the speed control
8.2.4 Resetting the parameters to plant values
8.2.5 DCF Signal
8.2.6 Adjustment of the temperature sensors
9. Drawings
9.1 Schematics of the refrigeration circulation
9.2 Electrical circuit diagram for
CT 0900 to CT 2000, FT 0700 to FT 1200
9.3 Electrical circuit diagram for CT 3000 and FT 1500
10. Faults
10.1 Fault codes
10.2 Emergency operation
10.3 Trouble-shooting
11. Scale Drawings
12. Technical Data

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1. Description
The units have been designed for the temperature range
given. If they have been operating outside of the given
range for a number of days, a serious fault in the unit must
be considered.
1.1 Deep-freezer refrigeration units
FT 0700, FT 1000, FT 1200, FT 1500
The units are designed for refrigeration of rooms in which
goods are kept at temperatures between -1°C and -25°C.
1.2 Refrigeration unit
CT 0900, CT1200, CT1500, CT 2000, CT 3000
These units are designed for refrigeration of rooms in which
goods are kept at temperatures between -5°C and +19°C.
2. General Notes
2.1 Extract from our conditions of guarantee
The guarantee is for one year. The period begins on the day
of delivery, as shown in the delivery note or invoice. Within
the period of guarantee, functional faults resulting from bad
quality or materials will be repaired free of charge.
Other claims resulting, especially those relating to
consequential damages, cannot be recognized.
No guarantee will be assumed for damage resulting form
improper use or operation, or improper assembly on the
part of the buyer or other parties, or for natural
depreciation, improper or careless handling, or for chemical,
electrochemical or electrical damage insofar as these do not
result from our own actions , or from non-attention to the
directions for assembly, operation and maintenance, or
from improper changes or repairs to the equipment by the
buyer or third parties, or resulting from parts supplied by
other companies. The guarantee is invalid if the coolant
circulation system is opened by unauthorized personnel, or
by interference with the system, or if the serial number of
the unit is changed or made unreadable.
2.2 Norms and regulations
At the time of production, the unit has been built and
tested according to the valid norms and regulations.
It complies with the
EMC Directive 2004/108/EC,
machinery directive 2006/42/EG.
The unit has been inspected at the factory for refrigerati-
on circulation leakage and for function.
2.3 Requirements for installation area / Intended use
The refrigeration unit may not be installed outdoors.
For economical operation, the temperature of the
surroundings of the unit should be from +5°C to +25°C.
The relative humidity of the room should not exceed
80%.
The room must be well-ventilated in order to ensure
release of heat. Avoid a direct source of heat near the
unit. Heating of the room must be avoided as this will
reduce the cooling efficiency and increase power usage.
The refrigeration unit is designed to allow open suction
and blow-off of air. If air ducts are required, a
refrigeration specialist must be consulted.
Sufficient free space must be provided for the ventilation
openings of the unit to guarantee proper ventilation.
- at least 600 mm from all ventilation openings
If this distance cannot be maintained, suitable measures
must be taken to guarantee proper ventilation
(air deflectors, ducts, additional fans).
Do not use the unit in areas in which strong magnetic
impulses can be expected or near radio antennae.

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Do not install the unit in areas where danger of explosion
exists.
Do not install the unit in areas where excessive danger of
fire exists.
According to DIN VDE 0100-482 (VDE 0100 Part 482):
1997-08, these are:
Rooms, or locations in rooms, or outdoors in which the
danger exists that easily flammable materials in dangerous
quantities can be near enough to electrical devices such that
higher temperatures or sparks could produce danger of fire.
These include: workshops, drying rooms, storerooms or parts
of rooms, as well as such areas outdoors: e.g. paper, textiles,
or wood processing plants, hay, straw, jute or flax storage
areas.
- According to BGR 500, chapter 2.35 or local regulations
for operation and maintenance. (qualified staff)
2.4 Transport
Due to the oil in the compressor, the refrigeration unit
may only be transported in the position in which it will be
used later.
2.5 Condition at time of delivery
The refrigeration unit is supplied in three parts.
The units consist of evaporation ventilation unit with the
ceiling cut-out enclosure, insulation housing and the
machine part of the ready-wired refrigeration unit.
2.6 Unpacking and handling
- Prior to and during unpacking, a visual check should be
made to determine if there has been any damage during
transportation.
- Please note all loose parts, dents, scratches or visible loss
of oil.
- During handling, grip the unit only on the lower part.
- Do not pick up the unit on the evaporation unit!
- Before the packing material is disposed of, check to
ensure that no loose parts are enclosed.
- To properly process claims with regard to the guarantee,
we request exact details of the damage (pictures) as well
as the type designation and serial number of the
machine.
- To protect the unit from damage, it may only be
transported and stored in the position of use. Ensure that
condenser and evaporator are not damaged. Otherwise
the guarantee can be invalidated.
2.7 Energy Savings
Do not install the unit near heat sources; high
temperatures in the surroundings will cause the unit to
operate more often.
Direct sunlight will also increase energy use.
Avoid non-essential opening and closing of doors.
Monitor temperature of storage. Clean the refrigeration
unit regularly. A clean unit saves energy and has a longer
life.
Observe proper intervals between cleanings (See Section
„Cleaning and maintenance of Refrigeration Units“).
Regular maintenance increases unit life.
Machine part
Insulation housing
Ceiling cut-out enclosure
Evaporation ventilation unit

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3. Cleaning and maintenance of the refrigeration unit
Attention!
Remove the plug from the power source during
cleaning and maintenance, and ensure it cannot be
accidentally reinserted.
The refrigeration unit should be inspected periodically
after beginning of operation and if necessary cleaned.
Depending on the degree of contamination, the time
between inspections and cleanings should be determined.
The intervals between cleanings will depend on the
conditions of the surroundings.
The condenser and evaporator can be cleaned either with
a soft cleaning brush, air compressor, or, in case of oily
contamination, with industrial cleansers. Do not use sharp
or pointed objects. The thin fins may not be bent or
damaged during cleaning.
Do not spray the unit with water or steam!
3.1 Disposal of refrigerant
If the refrigeration unit must be replaced by another one,
ensure that the pipe connectors on the unit are not
damaged such that refrigerant could escape.
Defective refrigeration units or refrigerant removed from
the device must be disposed of according to the
regulations applying.
4. Installation of the refrigeration unit in a Viessmann
coldroom
Attention!
Prior to assembly, the load capacity of the coldroom
ceiling must be checked.
The weights of the refrigeration units are listed in the
technical data.
There must be enough room in front of the suction and
exhaust openings of the refrigeration unit to ensure
proper ventilation.
- at least 600 mm in front of all such suction and exhaust
openings. The suction and exhaust units are shown in
the dimensional drawings.
Ceiling panels which the units are to be installed in should
be laid with the inside surface up.
Fix the enclosed assembly template on the surface in the
appropriate position using adhesive tape.
Mark the middle of the drilling holes and the corners of
the pattern.
Marking points on the template.
Remove the template and drill the fastening holes for the
enclosed dowels.
Draw the cutting lines by connecting the corner markings
with a pencil.
Using a sabre saw cut out the frame for the unit.
Attention!
The cut edges and drill holes must be protected
against corrosion with galvanising paint.

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Place the enclosed neoprene dowels M4 in the 8mm drill holes.
Assemble the evaporation fan unit on the inside plating so that the
exhaust opening is pointing in the right direction.
Screw the evaporation fan unit on with the enclose M4 screws.
Put the air jet in place and screw on tight on both sides with 3
screws each.
Turn the ceiling panel over.

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Seal the space between frame and cut-out with silicon.
and adhere with armaflex tape.
Mount the ceiling panel on the coldroom.
Lift the machine section of the refrigeration unit up to the
ceiling of the coldroom and position it on the cutout section
such that the insulating wall of the unit is approx 10mm over the
frame and the distance between frame and unit wall is about
50mm.
Do not lift the unit by the evaporator!
Carefully push the insulation cover over the evaporator and
connect it with the insulating wall of the unit using the excenter
locks.
The two lock holes on the cover must be closed with the
enclosed stoppers.
The cover and the unit wall should be approx 10mm over the
ceiling cut-out, such that any dripping defrosting water can run
off.
10mm

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Screw the air guide onto the ventilation box with three M6
screws such that the angled plate is pointing in the
direction of the fan and is lying on the defrost water pan.
Plug in the 4-pole plug of the electrical connection
(located between evaporator and separating wall) in the
socket in the evaporator ventilation unit, and lock in.
4.1 Connections for remote control
If the unit has been ordered with a remote control, mount
this on the proper location and connect to the 9-pin plug
on the front of the unit. Plug in the connector on the front
of the unit. Secure the plug connection with two screws.
3x

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4.2 Connecting a Bus Line
If several units are being operated (max 31) in one
coldroom, the remote control will be connected to the left
socket (plug with pins), and the right-hand socket will
be used to make the bus connection to the next unit. The
other plug of the bus connector is plugged into the left
socket of the next unit. The blind plug will be inserted into
the right socket of the last unit.
The addressing of the individual units will be done
automatically in the order they are connected to the bus.
If a unit is to be switched off it is removed from the bus,
and the addresses of the following units are reduced
automatically by one.
The power supply for the remote control is supplied by
the first unit. If the power for this unit is switched off, the
next unit takes over.
5. Drainage of defrost condensation
The refrigeration units have an integrated condensation
water pan with overflow safety.
In case of high condensation, it may be necessary to
provide an additional condensation drain. The 12mm
plugs for this are on the side of the condenser, on the
right side of the unit.
6. Coldroom electrical power supply
There is a 4-pin socket on the refrigeration unit on the
suction side of the evaporator for the electrical power
supply of devices in the coldroom with a total power
supply of 250 Watt (lighting, door frame heating). This
socket can also be used for a door contact switch.
Adress 1 Adress 2 Blind plug on the
last unit
Adress 3
Adress 0
If several units are being operated (max 31) in one coldroom,
the remote control will be connected to the left socket (plug
with pins), and the right-hand socket will be used to make the
bus connection to the next unit. The other plug of the bus
connector is plugged into the left socket of the next unit.
The blind plug will be inserted into the right socket of the last
unit.

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6.1 Connecting the door contact switch
The evaporation fan should be switched off when the door
is open. We recommend installing a potential-free door
contact switch. (Switching power 230VAC, min. 0.5A)
The connection is made to the 4-pin socket on the suction
side of the evaporator fan.
On delivery, the unit is ready for operation without an
external door contact switch. The door contact switch is
not part of the material delivered with the unit.
If a unit is connected to a door contact switch, the
parameter P29 on the regulator has to be set to „1“. (See
8.1, Parameter List)
6.2 Connection to the fault indicator
The regulator has a potential-free fault indicator to
be connected to such a system at the site (Max 10A,
230 VAC).
In case of fault, the contacts C and NC are closed.
The socket is on the plate. (Plug connector A3 orange)
6.3 Connecting to power supply and operation
Attention!
Do not switch electrical power supply on until
beginning operation – Danger!
Work on the power supply connection and protective
measure must be undertaken by a specialist according to
IEC 364, local regulations and the conditions of the local
power supply company.
Plugs must be placed in regulationgrounded sockets
(230VAC, 50Mz,16A).
The device will start after a self-test by the regulator with a
delay of approx 3 minutes (adjustable according to
parameter P34). For initial operation, this delay can be
avoided by switching the Start/Stop switch off and then
on again.
CNCNO
A
3
L1
22
33
11
PEPE
N
PE
230VAC
max. 250 VA
Door contact switch
Drawing shows open door
4-pin connector
on the unit from the coldroom

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7. Operating the SD regulator
7.1 Normal operation
The current coldroom temperature is shown on the
display. If one of the buttons is activated [ ] or [ ] the
current temperature setting is shown. The right decimal
point on the display lights up. If there is not further
activation of the button within ten seconds, the room
temperature is shown again.
By pressing the „Stop-Start-Enter“ button, the unit can be
switched off or on again. In the switched-off state, the
display shows „OFF“.
If, in the switched-off state, the two buttons [ ] and [ ]
are pressed and held, and the button „Stop-Start-Enter“ is
subsequently activated, the unit will begin a defrosting
cycle. If the two buttons [ ] and [ ] are not activated on
starting the unit, the unit will begin refrigeration. If a
defrosting cycle has been started prior to this, it will be
interrupted.
Do not activate the buttons with pointed objects
such as pens or screwdrivers.
Display during operation
Function German English French
StandBy OFF
Defrost Abt. dEF. dEg.
Display with
Button Activation and
Active Key-Lock
Bo.L
Fault (x= fault number) F.x E.x d.x
Version Display „Sd“ -> „5.13“

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7.2 Entering parameters
If during operation the two buttons [ ] and [ ] are
activated simultaneously, the parameter function is
activated.
In this function, the temperature settings and defrosting
times can be entered or changed. The type of operation
for the evaporator fan for high or low humidity in the
coldroom can be set.
On the display, the designation of the selected parameter
will appear, and at the same time the yellow LED will light
up on the button „Stop-Start-Enter“, and the Stop-Start
function is switched off.
Using this button, the display can be switched between
parameter designation and the value of the respective
parameter.
Using the button [ ] or [ ] the parameter address can be
changed, or the value of the parameter can be entered
within the given limits.
The parameters are protected from unauthorized changes
by means of a password.
To have access to the parameters available to the
operator, the value 05 must be entered in Parameter P01.
While operating press both buttons[ ] and [ ] at the
same time,
- the display shows up P01, concurrently the yellow LED is
blinking in the button „Stop-Start-Enter“.
Press button „Stop-Start-Enter“
- the display shows up 1.
- Select value 5 via the buttons [ ] resp. [ ]
Press button „Stop-Start-Enter“
- the display shows up P01 again.
Now the favoured parametres P02 – P09 resp. P02 – P23
(see 7.2.6 ) can be selected via the buttons [ ] and [ ].
Parameter entry is ended after 10 seconds if no button is
pressed. It will also be ended if the value 0 is entered in
P01.
7.2.1 Entering temperature setting
After entering the password, select Parameter P02 (Display
will read SL.t), press Enter button and current temperature
setting will be shown in °C. The setting can be changed
using [ ] or the [ ] button within the range previously
determined for the respective refrigeration unit type
(-5°C to +20°C; -25°C to -5°C for deep freezers)
7.2.2 Entering defrosting times
Defrosting according to set cycle times
- entering the interval between cycles
After entering the password, select parameter P03 (Display
will read „Ab.h“), press Enter button, and the current
setting for defrosting interval will be shown in hours. It
can be changed using the [ ] or the[ ] in the range of
1 to 24 hours.
The interval between defrosting cycles should be reduced
if the humidity in the coldroom is so high that the
evaporator is completely iced up.
Defrosting at set times:
If a DCF signal receiver is connected to the regulator, 12
switching points can be entered in the parameters P12 –
P23, at which the defrosting will start. This requirements a
setting for the P30 parameter, which may only be done
by a specialist.
After entering the password, select parameters P12 – P23
(Display will read „t.01 .. t.12), press Enter button, and the
current setting for starting the defrosting will be shown as
hh.m(x10). You can change the settings using the [ ] or
the [ ] button from 0.00 to 23.5. The numbers before the
decimal point show the hours, the number after the
decimal point shows the number of tens of minutes.
Entering the defrosting time:
After entering the password, select parameter P04 (Display
will read „Ab.d“), press Enter button, and the current
setting for defrosting time will be shown. It can be
changed using the [ ] or the [ ] button in the range of 5
to 60 minutes.
Defrosting will automatically cease prior to end of the
defrosting time set if the evaporator exceeds 10°C.
The defrosting time should be extended if the evaporator
is not completely defrosted at the end of the cycle.

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7.2.3 Selecting humidity in the coldroom
After entering the password, select parameter P05 (Display
will read „rF“), press Enter button, and the current type of
operation of the evaporation fan will be shown. Using
button [ ] the evaporator fan will begin constant
operation (high relative humidity) display will show „HI“;
using button [ ], the fan will run with the compressor
(low relative humidity, display will show „LO“.
7.2.4 Selecting language of the display
After entering the password, select parameter P06, press
the Enter button, and the language setting will be shown.
(d=German, gb = English, f=French). The setting can be
changed using the [ ] or the [ ] button.
7.2.5 Control Lock
If the value 0 is entered in parameter P07, the buttons [ ]
and [ ], and the Start-Stop button are locked. This
function can be used if the danger exists that the
regulator can be accessed by unauthorized personnel.
The Control Lock is active if the display shows „Bo.L” when
a button is pushed
Activating or Deactivating the control lock:
Press [ ] and [ ]simultaneously.
P01 is shown.
Press Enter button.
Select value 5.
Press Enter button.
Select P07.
Press Enter button.
Select value 01 (to switch off the Control Lock). After ten
seconds the current coldroom temperature will be shown,
and all the buttons are unlocked.
or
Select 00 (to switch on the Control Lock). After ten
seconds the current coldroom temperature is shown
again, and all the buttons are locked.

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7.2.6 Operator access
The parameters P02 .. P23 can only be accessed if the password 5 is entered in parameter P01 or if the password for the
operations parameters has been selected.
The parameters shown in italics cannot be changed.
Display reading of the selected parameter during entry of parameters
Function Parameter German English French Unit Range
Password P01 P01 P01 P01 0-99
Temperature setting P02 SL.t. n.t. t.n. °C P31..P32
Defrost cycle (h) P03 Ab.h dE.C c.dE hours 1-24
Defrost time (Min) P04 Ab.d dE.t d.dE minutes 5-60
Humidity (Evaporator fan)
LO=Operating Time with compressor
(low relative humidity)
HI=Constant Running (High relative humidity)
P05 r.F. HU. HU.
Language
d = German
e = English
f = French
P06 P06 P06 P06
Control lock
0 = Locked
1 = Released
P07 tA.F bo.E bo.E 0-1
Display of evaporator temp P08 P08 P08 P08 °C -50 .. 50/OFF
Display of condenser temp P09 P09 P09 P09 °C 0 .. 99/OFF
The following parameters can only be shown if the value x3 is set in P30 and a DCF signal
receiver is connected.
Current time (h) P10 P10 P10 P10 Std. 0 .. 23
Current time (Min) P11 P11 P11 P11 Min. 0 .. 59
Defrosting Time 1 P12 t.01 t.01 t.01 hh.m(x10) 00.0 ..23.5
Defrosting Time 2 P13 t.02 t.02 t.02 hh.m(x10) 00.0 ..23.5
Defrosting Time 3 P14 t.03 t.03 t.03 hh.m(x10) 00.0 ..23.5
Defrosting Time 4 P15 t.04 t.04 t.04 hh.m(x10) 00.0 ..23.5
Defrosting Time 5 P16 t.05 t.05 t.05 hh.m(x10) 00.0 ..23.5
Defrosting Time 6 P17 t.06 t.06 t.06 hh.m(x10) 00.0 ..23.5
Defrosting Time 7 P18 t.07 t.07 t.07 hh.m(x10) 00.0 ..23.5
Defrosting Time 8 P19 t.08 t.08 t.08 hh.m(x10) 00.0 ..23.5
Defrosting Time 9 P20 t.09 t.09 t.09 hh.m(x10) 00.0 ..23.5
Defrosting Time 10 P21 t.10 t.10 t.10 hh.m(x10) 00.0 ..23.5
Defrosting Time 11 P22 t.11 t.11 t.11 hh.m(x10) 00.0 ..23.5
Defrosting Time 12 P23 t.12 t.12 t.12 hh.m(x10) 00.0 ..23.5
Access for Specialist Firms
Access to P29 and above is only possible if the password for the operational parameters is entered in P01
(see special parameters list)
EIf no button is pushed within ten seconds, parameter entry is ended, and coldroom temperature will be displayed. The yellow LED in
the button „Stop-Start-Enter“ goes out, and this button resumes the function „Stop-Start“ Using some parameters, the functions of the
regulator can be monitored constantly. In this case, the yellow LED in the button „Stop-Start-Enter“ will blink. By activating the button
„Stop-Start-Enter“, the LED will operate for 10 seconds, and the button will subsequently return to normal operation.

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7.3 Fault Display
7.4 Deactivating the refrigeration unit
In case of longer periods of non-use or maintenance and
cleaning, deactivate the refrigeration unit by pulling the
plug. A short deactivation of the refrigeration unit can be
initiated by pushing the Start/Stop button
(StandBy Mode).
The refrigeration unit and the other users connected to it
are still connected to the electrical power supply while in
StandBy mode.
Note:
In case of loss of power, all the parameter settings are
retained.
Display Meaning
F01 Short-circuit in room sensor
F02 Room sensor broken
F03 Pressostat fault
F04 Coldroom temperature too high
F05 Coldroom door open
F06 Coldroom temperature too low
F07 Refrigeration capacity too low
F08 Evaporator sensor faulty
F09 Condenser sensor faulty
F10 Emergency Switch ON
F11 Fault in EEPROM

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8. Types of operational parameters
8.1 Parameter list
Attention!
The following parameters are important for the operation of the refrigeration unit. They may only be changed by
specialists. It is therefore recommended that the password for the access to the parameters be kept secret.
If the parameters are changed, the new ones should be entered in the column „Changed Values“.
Parameter for mode of operating (enabling by codeword P01 = 22)
The following parameters are as parameter for mode of operating for cooler resp. freezer prepared.
They can be adjust. If neccessary they can restore through P 50 and P 51 to the factory setting (see 7.5.2.3).
Parameter Description Unit Range Changed
values
Recommended
Normal
cooling
Deep-
freezer
P28 Signal Display from DCF Antenna seconds 0-59
P29 Door contact switch (0=without/1=with) 0-1 0 0
P30
Defrosting
00-03;
10-13 00
x0=according to set cycle times
x1 = according to set cycle times, but dependent on running time
of compressor
x2=dependent on set switch-on times (only with DCF Antenna)
x3=defrosting as required
0y=“Defrost Start“, door contact switched off
1y=“Defrost Start“, door contact switched on
P31 Max allowable room temperature °C -50 .. +50 20 -5
P32 Min allowable room temperature °C -50 .. +50 -5 -25
P33 Room temperature differential K 1-8 2 2
P34 Minimum stop time, compressor minutes 3-10 3 3
P35 Initiation delay, evaporation fan minutes 0-10 3 3
P36 Running time after stop, evaporator fan minutes 0-20 0 0
P37 Running time after stop, evaporator fan, to determine degree
of icing minutes 0-10 3 3
P38 Temperature difference to allow switch-on of defrosting K 10-40 25 25
P39 Defrost temperature limit °C +5 .. +50 20 20
P40 Drainage time, evaporator minutes 0-10 3 3
P41 Start temperature, evaporator fan °C -20 .. +10 -5 -15
P42 Delay time, temperature alarm minutes 0-99 60 60
P43 Upper temperature alarm (Setting + P43) K 0-20 10 10
P44 Lower temperature alarm (Setting – P44) K 0-20 5 5
P45 Delay time, door contact alarm minutes 0-99 4 4
P46 Temperature setting , condenser for rotation speed regulator °C 0-50 20 20
P47 Rotation speed, condenser fan in % OFF/
10..100
P48 Min rotation speed, condenser fan in % 10 .. 100 40 40
P49 Conductivity, rotation speed regulator, condenser fan 1-100 10 10
P50 Unit type, 1=normal refrigeration, 2=Deepfreezer 1-2 1 2
P51 Revert to plant settings (P=78)

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Parameter Description Unit Range Changed
values
Recommended
Normal
cooling
Deep-
freezer
P52 Running time, compressor, last cycle (hours) hours
P53 Running time, compressor, last cycle (minutes) minutes
P54 Running time, compressor, next to last cycle (hours) hours
P55 Running time, compressor, next to last cycle (min) minutes
P56 Running time, compressor, third-to-last cycle (hours) hours
P57 Running time, compressor r, third-to-last cycle (min) minutes
P58 Running time, compressor, fourth-to-last cycle (hours) hours
P59 Running time, compressor, fourth-to-last cycle (min) minutes
P60 Stop time, compressor, last cycle (hours) hours
P61 Stop time, compressor, last cycle (min) minutes
P62 Stop time, compressor, next-to-last cycle (hours) hours
P63 Stop time, compressor, next to last cycle (min) minutes
P64 Stop time, condenser, third-to-last cycle (hours) hours
P65 Stop time, condenser, third-to-last cycle (min) minutes
P66 Stop time, condenser, fourth-to-last cycle (hours) hours
P67 Stop time, compressor, fourth-to-last cycle (min) minutes
P68 Average running time, four cycles, condenser (hours) hours
P69 Average running time, four cycles, compressor (min) minutes
P70 Average stop time, four cycles, compressor (hours) hours
P71 Average stop time, four cycles, compressor (min) minutes
P72 Number of switch-ons, compressor (xxyy00-xxyy99)
P73 Number of switch-ons, compressor (xx00zzxx99zz)
P74 Number of switch-ons, compressor (00yyzz-99yyzz)
P75 Number of switch-ons after new start (xxyy00-xxyy99)
P76 Number of switch-ons after new start (xx00zzxx99zz)
P77 Number of switch-ons after new start (00yyzz-99yyzz)
P78 Number of pressostat faults (xxyy00-xxyy99)
P79 Number of pressostat faults (xx00zz-xx99zz)
P80 Number of pressostat faults (00yyzz-99yyzz)
P81 Running time, compressor, after end of defrosting hours
P82 Running time, compressor, after end of defrosting minutes

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Parameter Description Unit Range Changed
values
Recommended
Normal
cooling
Deep-
freezer
P83 Current bus address
P84 Running time, defrosting break hours
P85 Running time, defrosting break minutes
P86 Calibration of room sensor K -20..+20
P87 Calibration of evaporator sensor K -20..+20
P88 Calibration of condenser sensor K -20..+20
Regulator parameters (access if P01 = factory-password)
P90 Room sensor -50° adjustment
P91 Room sensor, conductivity
P92 Evaporator sensor -50° adjustment
P93 Evaporator sensor, conductivity
P94 Condenser sensor -50° adjustment
P95 Condenser sensor, conductivity
P96 Switch-on delay after door contact switch is closed minutes [0..20] 0 0
P101 Temperature setting +50
P102 Status byte 1
P103 Status byte 2
P104 Status byte 3
P105 Sensor byte 7
P106 Selected unit number (for remote control)
P107 Number of devices on the bus

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8.2 Description of the operational types and their
parameters
8.2.1 Defrosting
During the defrosting process, the display shows either
Abt or dEF or dEg.
Defrosting occurs generally by means of the electrical
heating. On completion of defrosting, the compressor
switches itself on after the time given in P40 for drainage.
The evaporator fan starts if the evaporator temperature
entered in P41 is not exceeded, or if the time entered in
P35 is completed following activation of the compressor.
The evaporator temperature can be shown in P08. If no
temperature sensor is connected to the evaporator, P08
will show „OFF“.
Defroster operational types
Using the P30 parameter, the type of operation of the
defroster can be selected.
- Defrosting initiated in a constant cycle
P30 =x0
Defrosting will be initiated if the time entered in P03 has
elapsed since the initiation of the last cycle.
Defrosting is completed if the evaporator temperature
exceeds the value entered in P39, or if the defrosting
time exceeds the value in P04.
- Defrosting initiated dependent on the running time
of the compressor
P30 = x1
At the end of defrosting, the running time of the
compressor is set to 0. When the running time of the
compressor reaches the value entered in P03, defrosting
is initiated.
Defrosting is completed when the evaporator
temperature exceeds the value entered in P39, or if the
defrosting time exceeds the value entered in P04.
- Defrosting is initiated at set times
P30 = x2
Defrosting is initiated if the internal clock reaches one of
the values entered in the parameters P12 – P23. If one of
the values in P12 – P23 is at OFF, this switch- on time is
skipped.
Defrosting is ended when the evaporator temperature
exceeds the value entered in P39, or if the defrosting
time entered in P04 is exceeded.
This parameter is only available if a regulator with DCF
signal receiver is connected.
- Defrosting is initiated dependent on the degree of
icing of the evaporator.
P30 = x3
The defrosting starts, if the evaporator temperature is
below the ambient temperature less the value entered in
P38.
Example:
Coldroom temperature = 5°C, P38 = 25
The defrosting starts, if the evaporator temperature falls
under -20°C.
For safety reasons, defrosting will also be initiated if the
running time of the compressor exceeds the value
entered in P03. It is therefore recommended that the
value of approx 10 hours be entered in P03.
Defrosting is ended when the evaporator temperature
exceeds the value entered in P39, or if the defrosting
time exceeds the value entered in P04.
- Additional defrosting is initiated if the coldroom
door is open for more than four minutes.
P30 = 1y
Defrosting will be initiated in addition to the type of
operation entered in the value y if the fault „coldroom
door open“ is displayed.

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8.2.2 Condenser Fan (for units with rotational speed control)
The condenser fan is equipped with a rotational speed
control in some unit types. The liquefaction temperature is
recorded by means of a temperature sensor on the
exhaust pipe of the condenser. If the sensor is not
connected for reasons of cost, the rotational speed control
is bridged over a relay and the fan runs at top speed.
The liquefaction temperature can be shown in P09. If the
rotational speed control is not active, or if no temperature
sensor is connected to the condenser, P09 shows OFF.
If the rotational speed control should break down, high
pressure pressostat will be activated if the fan is not
working. When the fault is recognized, the relay shuts the
fan on. Since the high pressure switch can also be
activated otherwise, the rotational speed control will be
reactivated after the refrigeration unit has run for one
hour. If the high pressure switch should be activated again
within one hour, the rotational speed control will be
bypassed and a fault shown. The fault can be confirmed
by pushing the [ ] or the [ ] button. The rotational speed
control remains bypassed until the power supply to the
unit is switched off and switched on again.
8.2.3 Setting the parameters for the speed control
The rotational speed control is set using the parameters
P46 … P49. In parameter P46 the liquefaction temperature
is set which is supposed to be maintained using the
rotational speed control.
In P48, the minimum rotational speed in% is set. P49 sets
the speed of reaction of the control. The smaller the value
is, the slower the speed control reacts to a change in
temperature; the higher the value, the faster it reacts.
8.2.4 Resetting the parameters to plant values
In P50, the unit type is selected
1 = Normal refrigeration
2 = Deep-Freezing
If the value 78 is selected in P51, the parameters P29 to
P49 will be set to the plant parameters according to the
unit type.
8.2.5 DCF Signal
Using the parameter P28, the DCF signal can be observed,
if the DCF Antenna is connected.
The display shows the seconds, and the decimal point of
the hundreds position blinks with the signal.
If the clock time has been correctly recognized twice in a
row, dCF shows on the display and the time is accepted.
While the DCF signal is being shown, the display will not
be reset.
The current time is shown in the parameters P10(h) and
P11(Min).
8.2.6 Adjustment of the temperature sensors
The temperature sensors can be compared using the P86
to P88 parameters.
Example:
The display shows a coldroom temperature of -15°C,
but the temperature in the coldroom is -18°C;
i.e. the display should show 3°K less. The value of the P86
parameter must be reduced by 3. If the display shows less
than the measured value, P86 must be increased
accordingly.