Technotherm CDE 18-27 VarioSelect User manual

TECHNOTHERM
1
THESE INSTRUCTIONS SHOULD BE READ CAREFULLY AND RETAINED FOR
FUTURE REFERENCE.
BE SURE TO OBSERVE ALL LABELS AND WARNINGS ON THE APPLIANCE
Arcle No.: 911 360 600
Edion: 07/15
Installaon and technical manual
Instant water heater
CDE 18–27 VarioSelect

Table of content
1. Overview ..............................................................................................3
2. Safety Instructions.......................................................................................4
3. Technical datas..........................................................................................5
4. Dimensions.............................................................................................5
5. Installation .............................................................................................6
Installation site .......................................................................................... 6
Mounting accessories ....................................................................................7
Mounting the wall bracket ................................................................................8
Installing connection pieces ...............................................................................9
Installing the appliance ...................................................................................9
6. Direct connection ......................................................................................10
7. Electrical connection ....................................................................................11
Wiring diagram.........................................................................................11
Structural prerequisites..................................................................................11
Electrical connection from below ..........................................................................11
Electrical connection from above ..........................................................................12
8. Initial operation ........................................................................................13
9. Maintenance work .....................................................................................14
Cleaning and replacing the filter strainer....................................................................14
Cleaning and replacing the filter strainer if direct connected ...................................................14
10. Environment and recycling .............................................................................15
11. Device description.....................................................................................15
12 Usage................................................................................................16
13 Self-help / customer service .............................................................................18
14 Guarantee ............................................................................................19

1. Overview
Specify when ordering spare parts device type and serial number

VarioSelectCDE 18-27 TECHNOTHERM
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2. Safety instructions
Please read these instructions carefully before installing or using the appliance! Keep the instructions handy with the applian-
ce for future use!
Instruction manuals are intended for the specialist who is respon-sible for the installation of the appliance. Operation
manuals are for the end user. The latest version of the instructions can be found online at
http://www.technotherm.com/Instantaneous-Water-Heater-varioselect.html
• Do not use the appliance until it has been correctly installed and unless it is in perfect working order.
• Do not remove the front cover under any circum-stances before switching off the mains electrical sup-
ply to the unit.
• Never make technical modifications, either to the appliance itself or the electrical leads and water
pipes.
• The appliance must be earthed at all times.
• Pay attention to the fact that water temperatures in excess of approx. 43 °C are perceived as hot,
especially by children, and may cause a feeling of burning. Please note that the fittings and taps may
be very hot when the appliance has been in use for some time.
• The appliance is only suitable for domestic use and similar applications inside closed rooms, and must
only be used to heat incoming water from the mains supply.
• The appliance must never be exposed to frost.
• The values stated on the rating plate must be observed.
• In case of malfunction, disconnect the fuses imme-diately. In case of leaks, cut off the mains water
supply instantly. Repairs must only be carried out by the customer service department or an authori-
sed professional.
• This appliance can be used by children aged from 8 years and above and persons with reduced physi-
cal, sensory or mental capabilities or lack of experience and knowledge if they have been given super-
vision or ins truction concerning use of the appliance in
a safe way and understand the hazards involved. Children shall not play with the appliance. Cleaning
and user maintenance shall not be made by children without supervision.

TECHNOTHERM
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3. Technical specifications
4. Dimensions
Typ CDE 18 .. 27 Vario Select
Energy efficiency class A *)
Rated capacity / rated current 18 kW (26 A) 21 kW (30 A) 24 kW (35 A) 27kW (39A)
Chosen capacity / current 3/PE 380..415V AC 3/PE 400V
Min. required cable size 1) 4.0 mm26.0 mm2 2)
Hot water (l/min) 1) max. at ∆t = 28 K
max. at ∆t = 38 K
9,23)
6,8
10,73)
7,9
12,23)
9,03)
13,83)
10,23)
Rated volume 0,4 l
Type Pressure type 1,0 MPa (10 bar)
Heating system Bare wire heating sytem
Required spec. water resistance @ 15 °C
Spec. electrical conductivity
≥ 1300 Ωcm
≤ 76 mS/m
Inlet temperature 0 – 30 °C
Flow rate to switch on – max. flow rate 4) 2,5 – 8,0 l/min
Pressure loss 0,2 bar bei 2,5 l/min 1,3 bar bei 9,0 l/min 5)
Temperature choice 35 °C / 38 °C / 42 °C / 48 °C / 55 °C
Water connection G ½“
Weight (when filled with water) 3,65 kg
VDE class of protection I
Type of protection / safety IP25
*) The declaration complies with the requirements of the EU regulation No 812/2013 being binding as of September 2015
1) Maximum applicable cable size is 10mm2
2) then replacing a 21 kW / 380 V appliance the cable size of 4 mm2 can be adopted.
3) Mixed water
4) Flow rate limited to achieve optimum temperature rise
5) Without flow regulator

VarioSelectCDE 18-27 TECHNOTHERM
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Installation site
• Appliance must only be installed in frost-free rooms. Never expose appli-ance
to frost.
• The Appliance must be wall mounted and has to be installed with water
con-nectors downward.
• The appliance complies with protection type IP25 and may therefore be instal-
led in protection zone 1 according to VDE 0100 part 701.
• In order to avoid thermal losses, the distance between the instantaneous water
heater and the tapping point should be as small as possible.
• For maintenance work, a shut-off valve should be installed in the supply line.
The appliance must be accessible for maintenance work.
• Plastic pipes may only be used if they conform to DIN 16893, Series 2. The hot
water pipes must be thermally insulated.
• The specific resistance of the water must be at least 1100 Ω cm at 15 °C. The
specific resistance can be asked for with your water distribution company.
5. Installation
• The following regulations must be observed:VDE 0100
• EN 806-2
• Installation must comply with all statutory regulations, as well as those of the
local electricity and water supply companies.
• The rating plate and technical specifications
• Only intact and appropriate tools must be used

TECHNOTHERM
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For installations under difficult condi-
tions, these mounting accessories are
available:
Mountik kit RDX
The instant water heater can be instal-
led by means of this mounting kit in
the below situations. The power supply
cable is coming out of the wall at any
place from behind the unit, but the
wall has unusual surface conditions,
making it difficult for installing the
water heater. The power supply cable is
coming from elsewhere and has to be
connected to the back of the unit.
Mounting accessories
Extension kit VDX
RDX is necessary!
The instant water heater can be instal-
led by means of this extension kit if the
water pipes are coming displaced or
exchanged out of the wall or if they are
coming edge-wise on the wall to the
unit. The power supply could come out
of the wall at any place under the unit
or the wiring could be installed
surface-mounted.
Extension kit UDX
RDX is necessary!
The instant water heater can be instal-
led by means of this extension kit if the
water-connections are expiring above
the unit. The power supply could come
out of the wall at any place under the
unit or the wiring could be installed
surface-mounted.
5. Installation

VarioSelectCDE 18-27 TECHNOTHERM
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5. Installation
Note: If you install this instantaneous water heater in exchange for a conventional
instantaneous water heater, there is generally no need to drill holes for the wall
bracket, in this case step 2 would not be necessary.
Thoroughly rinse the water supply pipes before installation to remove soiling from
the pipes.
1. Using a 12 mm hexagon socket screw key, screw the screw-in nipples into the
wall connections. The seals must be fully screwed into the thread. After tigh-
tening, the double nipples must protrude by at least 12 mm.
2. Hold the included mounting template on the wall and align it so that the holes
in the template fit over the connections. Mark the drill holes accord-ing to the
template and drill them using a 6 mm drill. Insert the included dowels.
3. Screw in the wall bracket. Offset tiling or uneven surfaces can be compensated
by up to 30 mm with the aid of the spacers supplied. The spacers are fitted
between the wall and the wall bracket.
Installing the wall bracket

TECHNOTHERM
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5. Installation
Note: Fasten the screw nuts with cau-tion, to avoid damage to the valves or the
piping system.
1. As shown in the illustration, screw the cold water connection piece with the
union nut and the ½“ seal onto the cold water connection.
2. Screw the hot water connection piece with the union nut and the ½“ seal onto
the hot water connection.
1. To open the appliance hood, take off the faceplate and unscrew the main hood
screw.
2. When replacing an appliance, the elec-trical power supply cable may be con-
nected in the upper part. Only in such case, follow the instructions “Electrical
connection from above”.
3. Place the appliance on the heater bracket so that the threaded rod of the wall
bracket fits in the provided hole of the appliance. If necessary, slight corrections
are possible by carefully bending the threaded rod of the wall bracket. However,
it must be possible to screw on the water connection pipes of the appliance
without applying force.
4. Screw the two ⅜“ union nuts of the appliance‘s water connection pipes, each
with the ⅜“ seal, onto the fittings.
5. Screw the plastic knurled nut onto the threaded rod of the wall bracket.
Installing connection pieces
Installing the appliance

VarioSelectCDE 18-27 TECHNOTHERM
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6. Direct connection
Note: Fasten the screw nuts with caution, to avoid damage to the valves or the
piping system.
For direct connection, the two ½“ screw-in nipples and the ½“ seals must be
screwed into the ½“ union nuts of the hot-water and cold water connectors. The
two ½“ caps of the side outlets of the hot water and cold-water connectors must
be removed and screwed onto the open end of the screw-in nipples. The hot
water and cold-water connectors must then be screwed into the 3/8“ union nut of
the appliance and delivery pipe, together with the 3/8“ seals.
For direct connection, it is advisable to mount the appliance at a distance as
illus-trated alongside, using the spacer sleeves supplied. It should therefore be
noted that the two fixing holes near the lower pipe connections are also used.
The flared end of the pipes must be screwed into the ½“ side outlets of the
hot-water and cold-water connectors with ½“ union nuts and ½“ seals. The holes
required for the pipes must then be bro-ken out of the housing with the aid of a
blunt implement.
In case of direct connection please note: Put the strainer into the cold water
connection!

TECHNOTHERM
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Structural prerequisites
• The appliance must be installed via a permanent connection. Heater must be
earthed!
• The electric wiring should not be injured. After mounting, the wiring must not
be direct accessible.
• An all-pole disconnecting device (e.g. via fuses) with a contact opening width of
at least 3 mm per pole should be provided at the installation end.
• To protect the appliance, a fuse element must be fitted with a tripping current-
commensurate with the nomi-nal current of the appliance.
(0, 1 or 2) is shown on the display, then release the keys. Operating mode 1 must
be selected first, thus to check the correct operation of the load shedding relay at
low appliance output (35 degree setpoint and low water flow rate). Mode 2 must
be selected if the load shedding relay flickers
Wiring diagram
7. Electrical connection
1. Electronic circuitry
2. Heating element
3. Safety pressure cut-out
4. Therminal strip
5. Safety thermal cut-out
Only by a specialist!Please observe:
• The installation must comply with current IEC and national local regulations or
any particular regulations, specified by the local electricity supply company
• The rating plate and technical speci-fications
• The unit must be earthed!
Note: If necessary, the connecting terminal can be displaced to the upper part
of the appliance. If you want to do so, please follow the instructions in the next
chapter. Check that the power supply is switched off prior to electrical connecti-
on!
1. Dismantle approximately 6 cm off the connecting cable above the wall outlet.
With the smaller opening ahead, slide the water splash protection sleeve over
the connecting cable so that the sleeve is flush with the wall. This prevents
any leaking water from coming into contact with the electrical leads. It must
not become damaged!The protection sleeve must be used!
2. Open the control panel rightwards.
3. Strip the cables and plug them in the connecting terminals according to the
wiring diagram. The appliance must be earthed.
4. Pull the protective sleeve over the connecting cables until the sleeve fits
per-fectly in the recess of the intermediate panel. Adjust the water splash
protection sleeve as illustrated. Reinsert the control panel and lock it on the
heating element.
5. Place the hood on the appliance and screw in the fastening screw. After that
you can reinsert the faceplate.
Electrical connection from below
21
4
5
3

VarioSelectCDE 18-27 TECHNOTHERM
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7. Elektroanschluss
Check that the power supply is switched off prior to electrical
connection
1. Open the prepared breaking point (S) in the upper part of the
appliance by pressing with a blunt implement (e.g. srewdriver).
2. Slit the grommet to match the cable size. The opening in the
grommet should be slightly smaller than the cross-section of the
cable in order to ensure optimum protection against water. Fit the
grommet into the opening. The protection grommet must be used!
3. Dismantle the cable roughly 6 cm above the point where it
emerges from the wall. Hold the prepared appliance so that you
can route the cable into the grommet with the other hand.
4. Place the appliance on the heater bracket so that the threaded rod
of the wall bracket fits in the provided hole of the appliance
5. Unscrew the fastening screw of the connecting terminal. Displace
the connecting terminal to the upper foot. Affix the connecting
terminal again.
6. Strip the cables and plug them in the connecting terminals
according to the wiring diagram. The appliance must be earthed.
7. Place the hood on the appliance and screw in the fastening screw.
After that you can reinsert the faceplate.
Electrical installation from above

TECHNOTHERM
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8. Initial operation
Before making the electrical connection, fill the mains and the appliance with
water by carefully opening and closing the hot water tap in order to vent
completely. After every draining (e.g. after work on the plumbing system or f
ollowing repairs to the appliance), the heater must be revented in this way before
starting it up again.
If the water heater cannot be put into operation, the temperature cut-out or the
pressure cut-out may have tripped during transport. If necessary, reset the
cut-out.
Selection of power rating
Only by authorised specialist, otherwise lapse of guarantee!
Upon first connection of the appliance to the supply voltage, select the maximum
power rating. Only after having set the power rating, the heater provides its
standard operation mode.
The maximum allowable power rating at installation site depends on the local
situ-ation. It is imperative to observe all data shown in the table “Technical specifi-
cations“, in particular the required cable size and fuse protection for the electrical
connection. Moreover, the electrical installation must comply with the statutory
regulations of the respective country and those of the local electricity supply
com-pany (Germany: DIN VDE 0100).
1. Switch on the power supply to the appliance. The digital display on the
appliance must light up.
2. When switching on the supply voltage for the first time, the value “21“ flashes
in the display. If not, please follow the below note “Reinstallation“.
3. Select the maximum allowable power rating depending on the local situation
via the up and down arrow keys (18 kW, 21 kW, 24 kW or 27 kW).
27 kW = red 24 kW = yellow
21 kW = green 18 kW = all three LEDs
4. Press key to confirm the setting. The appliance starts operating.
5. Mark the set power rating on the rating plate.
6. After having set the maximum allowable power rating, the heating element will
be activated after approx. 30 sec of continuous water flow.
7. Open the hot water tap. Check the function of the appliance.
8. Explain the user how the instantaneous water heater works and hand over the
operating instructions.
Fill in the guarantee registration card and send it to the TECHNOTHERM
Customer Service.
Reinstallation
In case the appliance will be commissioned again under different installation
conditions than during its initial operation, it may be necessary to adapt the
maximum power rating.
A temporary short circuit of the two pins, e.g. with a screwdriver acc. to EN 60900
(see figure), will reset all heater parameters to works setting and lock the
heating. Value “21“ flashes in the display until the maximum power rating has
been selected. This condition will maintain when activating and deactivating the
supply voltage.
Abb. 1: connect plug
Abb. 3.1
3 LEDs flashes for approx. 0,5
seconds
electronic
35 °C
38 °C
42 °C
48 °C
55 °C
electronic
Abb. 3.2
3-time flashing for example,
24 kW:
electronic
35 °C
38 °C
42 °C
48 °C
55 °C
electronic
Abb. 2
LED 4 flashes on the electronic
cover
Sicherheitsvorschriften beachten!
Pay attention to safety instructions!
Temp. IN
Art.Nr. 9130-34342
L1
L2
L3
LED 6
LED 5
LED 4
LED 3
LED 2
LED 1
QUALITÄT GEPRÜFT
QUALITY APPROVED
AIR
Temp. OUT
Max. Leistung
18 kW
21 kW (grün )
24 kW (gelb )
27 kW (rot )
– · 18 kW – · · 21 kW
– · · · 24 kW – · · · · 27 kW

VarioSelectCDE 18-27 TECHNOTHERM
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1. De-energize the instantaneous water heater (e.g. via deactivating the fuses) and
prevent inadvertent reactivation of them.
2. To open the hood, take off the small face plate, loose the screw behind this
cover and detach the hood.
3. Close the shut-off valve (a) in the cold water connection piece (position “
closed“).
4. Unscrew the screw plug (b) from the cold water connection piece and take out
the strainer (c).
5. The strainer can now be cleaned or re placed.
6. After fitting of the clean strainer tighten the screw plug.
7. Slowly reopen the shut-off valve in the cold water connection piece
(position “open“).
8. Vent the unit by carefully opening and closing the affiliated warm water tap
valve several times until air no longer emerges from the pipe.
9. Fit the hood of the unit. Then switch on the voltage again (e.g. via activating the
fuses).
9. Maintenance work
Cleaning and replacing the filter strainer if direct connected
The cold water connection of this instantaneous water heater is equipped with a
strainer. Soiling of the strainer may reduce the warm water output. Clean or repla-
ce the strainer as follows:
1. De-energize the instantaneous water heater (e.g. via deactivating the fuses) and
prevent inadvertent reactivation of them.
2. Close the shut-off valve in the mains water supply of the instantaneous water
heater.
3. To open the hood, take off the small face plate, loose the screw behind this
cover and detach the hood.
4. Unscrew mains water inlet from connection piece and take out the strainer.
5. The strainer can now be cleaned or replaced.
6. After refitting the clean strainer reconnect the mains water inlet to the con-nec-
tion piece.
7. Slowly reopen the shut-off valve in the mains water supply.
8. Vent the unit by carefully opening and closing the affiliated warm water tap
valve several times until air no longer emerges from the pipe.
9. Fit the hood of the unit. Then switch on the voltage again (e.g. via activating the
fuses).
Maintenance work must only be conducted by an authorised professional.Cleaning
and replacing the filter strainer. The cold water connection of this instantaneous
water heater is equipped with an integrated shut-off valve and a strainer. Soiling of
the strainer may reduce the warm water output. Clean or replace the strainer as
follows:

TECHNOTHERM
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10. Environment and recycling
The water heater CDE 18-27 Varioselect is a microprocessor controlled, pressure-
resistant water heater for decentralized water supply to one or more points.
Once open the hot water tap on the faucet, the water heater automatically swit-
ches on. When closing the valve, the device switches off automatically. The elec-
tronics adjusts the power to the respective inlet temperature and the flow rate to
reach the preset outlet temperature to the power limit. By pressing the control
key, the outlet temperature can be changed.
Of course it is also possible to determine the outlet temperature by mixing at
the valve of cold water with hot water (55 ° C) from the water heater. Energy and
water saving, however, the adjustment of the respective useful temperature at
water heater to mix on the valve without cold water.
The outlet temperature may then be increased by reducing the amount of hot
water at the faucet.
11. Device description
35 °C
38 °C
42 °C
48 °C
55 °C
electronic
Your product was manufactured from high-quality, reusable materials and
com-ponents. Please respect in case of discarding that electrical devices should
be disposed of separately from household waste at the end of their service life.
Therefore, please take this device to a municipal collecon point that accepts
electronic scrap on a free of charge basis. Disposing it correctly will support
environ-mental protecon and will prevent any potenal negave eects on
human beings and the environment that could arise from inappropriate handling
of these devices at the end of their service life. Please contact your local authority
for further details of your nearest designated collecon point or recycling site.
Business customers: If you wish to discard electronic equipment, please contact
your dealer or supplier for further informaon.

12. Usage
Set the temperature
By pressing the temperature selection button, the flow temperature is changed to
the respective next stage. The substance may have the following five temperature
levels: 35 ° C - 38 ° C - 42 ° C - 48 ° C - 55 ° C.
The LEDs indicate which target temperature is set:
• If only one LED flashes, then the temperature value is set next to the light.
• If two LEDs are lit, then the temperature value is between the illuminating LEDs
set. After 55 ° C when a new key is pressed the set temperature is again 35 ° C.
Of course it is also possible to determine the outlet temperature by mixing at the
valve of cold water with hot water (55 ° C) from the water heater.
electronic
35 °C
38 °C
42 °C
48 °C
55 °C
electronic
electronic
35 °C
38 °C
42 °C
48 °C
55 °C
electronic
electronic
35 °C
38 °C
42 °C
48 °C
55 °C
electronic
electronic
35 °C
38 °C
42 °C
48 °C
55 °C
electronic
electronic
35 °C
38 °C
42 °C
48 °C
55 °C
electronic
Three colored LEDs
electronic
35 °C
38 °C
42 °C
48 °C
55 °C
electronic
16

TECHNOTHERM
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12. Usage
• Plastic surfaces and fittings should only be wiped with a damp cloth. Do not use
abrasive or chlorine-based cleaning agents or solvents.
• For a good water supply, the outlet fittings (special tap aerators and shower
heads) should be unscrewed and cleaned at regular intervals. Every three years,
the electrical and plumbing components should be inspected by an authorised
professional in order to ensure proper functioning and operational safety at all
times.
Cleaning and care
The appliance must be vented before using it for the first time. Each time the
appliance is emptied (e.g. after work on the plumbing system, if there is a risk of
frost or following repair work), the appliance must be revented before it is used
again.
1. Disconnect the instantaneous water heater from the mains (e.g. via
deactivating the fuses).
2. Unscrew the jet regulator on the outlet fitting and open the cold water tap
valve to rinse out the water pipe and avoid contaminating the appliance or the
jet regulator.
3. Open and close the hot water tap until no more air emerges from the pipe and
all air has been eliminated from the water heater.
4. Only then should you reconnect the power supply again (e.g. via activating the
fuses) to the instantaneous water heater and screw the jet regulator back in.
5. The appliance activates the heater after approx. 10 seconds of continuous
water flow.
Venting after maintenance work

VarioSelectCDE 18-27 TECHNOTHERM
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Problem Cause Solution
Water stays cold, display does
not light up
Master fuse tripped Renew or activate fuse
Safety pressure cut-out
tripped Contact customer service
Water stays cold, display does
light up
Safety thermal cut-out
tripped Contact customer service
Flow rate of hot water too
weak
Outlet fitting dirty or
calcified
Clean shower head, jet
regulator or sieves
Fine filter dirty or
calcified Clean fine filter
Selected temperature is not
reached
Excessive water flow
(winter?)
Reduce water flow rate at
the outlet
Elected power too small
Control the set power:
1. Check power selector
plug
2.Carry out a reset, note
blink code
Selected temperature is
perceived as too cold Set temperature too low Increase set temperature by keypress
Selected temperature is
perceived as too hot Set temperature too high Decrease set temperature by keypress
Lucht LHZ Elektroheizung GmbH
Obere Hauptstr. 61
09232 Hartmannsdorf
Germany
Telefon: [phone]
Telefax: [phone]
E-Mail: [e-mail]
13. Self-help and customer service
Repairs must only be carried
out by authorised professio-
nals.
If a fault in your appliance
cannot be reced with the
aid of this table, please con-
tact the service organisa on
of your importer or the Cen-
tral Customer Service Depart-
ment. Please have the details
of the typeplate at hand!

TECHNOTHERM
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Int. Arkelnummer: 9120-34133
Edion: 07/2015
Subject to technical changes, design changes and errors.
We are pleased to oer a 24 month guarantee on your recent purchase of TECHNOTHERM device.
A tow year guarantee is applicable to the electronics. The period of guarantee commences with the day of deli-
very. If within the guarantee period the device is defecve due to faulty components we undertake to repair the
device free of charge.
The guarantee shall not apply to damages caused by natural wear and tear, intenonal misuse, non-observance of
the operaonal instrucons, connecon to incorrect supply voltage, damages caused by corrosion
or rust or use of aggressive cleaning agents or calcied.
The purchaser shall not be entled to any rights and/or remedies under this guarantee if the device has
been repaired, or aempted to be repaired, without wrien authorisaon from us or if a part or parts not
supplied by us have been used in a repair.
Any claims for compensaon of damages beyond the scope of this guarantee are excluded.
The period of guarantee shall not be renewed or extended by repair or substute radiator.
The guarantee shall not be transferrable without approval.
All guarantee claims must be accompanied by a relevant test cercate which is supplied with every
TECHNOTHERM devices.
The guarantee and warranty limitaons require that the device and all accessories be properly installed otherwise
the manufacturer‘s does not accept the guarantee. Warranty claim is made only upon presentaon of proof of
purchase (invoice, purchase receipt, warranty cercate, etc.). Modicaons of the device lead to an exncon of
the manufacturer‘s guarantee obligaon.

VarioSelectCDE 18-27 TECHNOTHERM
20
Lucht LHZ Elektroheizung GmbH
Obere Hauptstr. 61
09232 Hartmannsdorf
Germany
Telefon: [phone]
Telefax: [phone]
E-Mail: [e-mail]