Zip InLine DEX Next Manual

Zip
InLine
Installation instructions & user manual
Model number:
DEX Next, DEX12 Next
Electronically controlled instantaneous water heaters.
1Installation instructions & user manual
9120-34378 v1.00 Sept 2020 - ZIP DEX Next / DEX12 Next Technical support
Tel: [phone] email: [email protected].uk www.zipwater.co.uk

2Installation instructions & user manual
9120-34378 v1.00 Sept 2020 - ZIP DEX Next / DEX12 Next
Technical support
Tel: [phone] email: ser[email protected].uk www.zipwater.co.uk
Contents
Safety instructions .......................................
Operation instruction
. Description of the appliance ............................
. Environment and recycling .............................
. How to use ...........................................
Main screen...........................................
Main menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
Statistics .............................................
Settings ..............................................
User .................................................
Device Information ....................................
Top-up heating ........................................
How to save energy....................................
Venting after maintenance work.........................
Cleaning and maintenance ..............................
. Trouble-shooting and service...........................
. Product data sheet in accordance with EU regulation -
/ / ...............................
. Warranty ............................................
Installation instruction
. Overview............................................
. Technical specifications ...............................
. Dimensions ..........................................
. Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation site .......................................
Mounting accessories .................................
Installing the wall bracket..............................
Installing connection pieces............................
Installing the appliance ................................
. Direct connection ....................................
. Electrical connection .................................
Wiring diagram DEX Next..............................
Wiring diagram DEX Next ...........................
Structural prerequisites ...............................
Load shedding relay (DEX Next only. . . . . . . . . . . . . . . . . . . . .
Electrical connection from below .......................
Electrical connection from above (DEX Next only) ........
. Initial operation ......................................
Selection of power rating ..............................
Reinstallation ........................................
Shower application ...................................
Locking function .....................................
. Maintenance work ....................................
Cleaning and replacing the filter strainer ................
Cleaning and replacing the filter strainer if direct
connected ...........................................
The documents supplied with the device must be stored carefully.

3Installation instructions & user manual
9120-34378 v1.00 Sept 2020 - ZIP DEX Next / DEX12 Next Technical support
Tel: [phone] email: ser[email protected].uk www.zipwater.co.uk
Safety instructions
IMPORTANT:
PLEASE READ THESE INSTRUCTIONS CAREFULLY. NOTE THE SAFE OPERATIONAL REQUIREMENTS, WARNINGS AND
CAUTIONS. USE THIS PRODUCT CORRECTLY AND WITH CARE FOR THE PURPOSE FOR WHICH IT IS INTENDED. FAILURE
TO DO SO MAY CAUSE DAMAGE AND/OR PERSONAL INJURY, AND WILL INVALIDATE THE WARRANTY. RETAIN THESE
INSTRUCTIONS FOR FUTURE USE.
WARNINGS
• Installation, commissioning and maintenance of this appliance must only be carried out by a
competent installer who will then be responsible for adhering to all relevant standards and regu-
lations.
• If inlet temperature is up to 70°C (eg. fed from a solar supply) mixing with cold water will be
required to ensure a safe temperature at the outlet.
• Do not remove the front cover under any circumstances before switching off the mains electri-
cal supply 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 values stated on the rating plate must be observed.
• In case of malfunction, disconnect the mains power supply immediately. In case of leaks, cut
off the mains water supply instantly. Repairs must only be carried out by the customer service
department or an authorised professional.
• This appliance can be used by children aged 3years and above and persons with reduced physi-
cal, sensory or mental capabilities or lack of experience and knowledge if they have been given
supervision or instruction concerning use of the appliance in a safe way and understand the haz-
ards involved. Children shall not play with the appliance. Cleaning and user maintenance shall not
be performed by children without supervision.
• If the appliance is factory equipped with a power supply cable, it must be replaced with an origi-
nal spare cable from the manufacturer in case of damage by an authorised technician in order to
avoid any hazards.
• In accordance with EN 60335, the appliance must be permanently connected to the supply
through an isolating switch with a contact separation of at least 3 mm in all poles and be protect-
ed by a suitably rated RCD.
• The wall bracket must be secured with the supplied screws and dowels. The appliance must be
secured to the wall bracket. The appliance may only be operated if it has been properly mounted
on the wall bracket.
• The required water resistance may not fall below the value stated on the rating plate at any time.

4Installation instructions & user manual
9120-34378 v1.00 Sept 2020 - ZIP DEX Next / DEX12 Next
Technical support
Tel: [phone] email: ser[email protected].uk www.zipwater.co.uk
Safety instructions
To observe additionally for pressureless installation:
• The water outlet behind the devices must not be blocked, and the water flow must not be
restricted.
• The water outlet facilities, such as shower heads must be decalcified regularly. Deposits must be
removed at regular intervals.
• Only the fittings recommended by the manufacturer may be used.
• If the appliance is exclusively connected to a single shower, only the shower heads recommend-
ed by the manufacturer may be used. No other fittings or appliances which decrease the water
flow to the shower may be installed.
• The Zip InLine is intended for connection to mains supply only. In any other case please contact
Zip on 0345 6 005 005 for advice.
• Zip Water UK cannot be held liable for any damages caused by failure to observe these instruc-
tions.
!CAUTIONS
• Optimum operation is ensured at a water flow pressure of 0.2 to 0.4 MPa (2-4bar). The appli-
ance must not be subjected to pressure exceeding 1.0MPa (10 bar).
• The appliance must only be used when correctly installed and in perfect working order.
• The appliance must be installed in a frost-free room and must never be exposed to frost.
• The DEX and DBX range is not intended for use with thermostatic mixing valves or taps. If ther-
mostatic mixing valves or taps are to be used, their compatibility with the instantaneous water
heater must be verified under site operating conditions.
• The appliance must be completely filled with water before being switched on.
• Before commissioning for the first time and each time the appliance or the piping system is emp-
tied (e.g. due to work on the plumbing system or maintenance), the appliance must be purged by
opening and closing the hot water tap until all air has been eliminated from the water heater and
no more air emerges, before re-connecting to the electrical supply.
• The appliance must only be used for heating wholesome (or cat 1) water. The specific water
resistance must not fall below the required value indicated on the rating plate. The appliance
must not be used for any other purpose.
• Incoming water temperature must not exceed that stated in Technical data.

5Installation instructions & user manual
9120-34378 v1.00 Sept 2020 - ZIP DEX Next / DEX12 Next Technical support
Tel: [phone] email: ser[email protected].uk www.zipwater.co.uk
1. Description of the appliance
As soon as you open the hot water tap, the instantaneous water heater switches on
automatically. When the tap is closed, the appliance automatically switches off. The
water heater is operated at the device itself or with an optional wireless remote con-
trol.
The E-convenience instant water heater DEX Next / DEX 12 Next is a fully electroni-
cally controlled instantaneous water heater with graphics-enabled e-paper display and
sensor keys for a convenient and efficient water supply to one or more tap outlets.
Its electronic control regulates the power consumption depending on the selected
outlet temperature, the respective inlet temperature and the flow rate, thus reaching
the set temperature exactly to the degree and keeping it constant in case of water
pressure fluctuations. The required outlet temperature can be entered via the sensor
keys within a range between 20°C and 60 °C and can be read off the e-paper display.
The DEX Next / DEX12 Next has an intuitive menu guide where different user profiles
can be set up and where collected data can be read out
The inlet temperature can be up to 70 °C so that operation in connection with reheat-
ing, e.g. in solar systems, is possible.
It is possible to use the instantaneous water heater DEX Next in combination with an
external load shedding relay for electronically controlled instantaneous water heaters
(refer to installing instructions).
Your product was manufactured from high-quality, reusable materials and components. 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 collection point that return used electronic devices to the recycling system. Disposing it correctly will support
environmental protection and will prevent any potential negative effects 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 collection point or recycling site.
Business customers: If you wish to discard equipment, please contact your dealer or supplier for further information.
2. Environment and recycling
Operation instruction
Note: Carefully read the enclosed safety instructions through in full before the appliance
is installed, put into service and used and follow them in the further steps and during use!

6Installation instructions & user manual
9120-34378 v1.00 Sept 2020 - ZIP DEX Next / DEX12 Next
Technical support
Tel: [phone] email: ser[email protected].uk www.zipwater.co.uk
Temperature display
The scale ring fills up as the temperature setting is increased. In addition, the target
temperature is displayed in °C in the middle of the display.
Temperature setting
The desired temperature can be selected via the two middle sensor keys within a range
of 20 °C to 60 °C. Tapping once changes the temperature by 1°C, in the comfort range
between 35 and 43°C by 0.5°C. If the temperature is set below 20°C, the symbol
appears in the temperature display and the appliance switches off the heating function.
User selection
Up to four user profiles can be created. Every user has the option to save his desired
temperatures for the different application in his profile. The user profiles can be select-
ed by tapping on the left sensor key and than tap the key under the profile picture (to
adapt profile, see Section “User”).
Applications
Preset applications can be selected here. Simply tap on the right sensor key to open the
selection. Tap on the sensor key under an application symbol to activate it.
The temperatures are set at the factory to the following values: hand wash=35 °C,
shower=38 °C, bath tub=42 °C, hot water=48 °C
To change the values select an application and set the new temperature. Than press and
hold the sensor key under your profile picture or the application for two seconds.
Status display, top
Control lock active (PIN)
The inlet temperature exceeds the target value (appliance does not heat up)
Optional remote control or Home Server is installed. The appliance can be
controlled remotely
Status display, bottom
Display area for functions which require confirmation from the user or which are of
great significance.
Maintenance: The appliance detected an error. Select “Info” in the Main menu
to get further informations.
3. How to use
Main screen
The e-paper display changes automatically to main screen approx. 60 seconds after
activation or operation.
Tab the sensor keys to select user profiles or applications or change the temperature.
Temperature display
Status display, bottom
Status display, top
Sensor keys
Applications
User
Menu button

7Installation instructions & user manual
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Tel: [phone] email: ser[email protected].uk www.zipwater.co.uk
Main menu
Press the menu button to enter the main menu. All function menus and saved values of
the appliance can be selected from here.
Maximum temperature reached: The temperature cannot be increased any fur-
ther since the set temperature limit has been reached. The temperature limit
can be changed in the main menu via “Settings”.
Heating activated: As soon as the appliance heats water, this symbol appears.
Power limit: The full output of the instantaneous water heater does not suffice
to heat the tapped quantity of water to desired temperature. Reduce the quan-
tity of warm water at the tap.
3. How to use
Statistics
In the statistics the consumption and usage data are captured by the appliance and dis-
played in graph format:
Water consumption
Power consumption
Total consumption costs
Select or to scroll through the different periods. The consumptions are dis-
played in diagrams over a period from the last drawing of water or the total consump-
tion.
Note: The consumption data are not suitable for billing purposes.
Settings
This menu is used for the basic configuration on the appliance. Select or to
scroll through the different menu items and tap “OK” to change settings directly or go
to submenus.
Temperature Unit: Defined as °C.
Language: Select the menu language.
Sound: Activate / deactivate operating sounds.
Note: Alarm signals and instruction sounds can not be disabled.
Currency: Select a currency symbol.
Temperature Limit: The temperature limit can be activated / deactivated in this menu
and the maximum warm water temperature can be limited to a desired value within the
temperature setting range.
Note: If the instantaneous water heater supplies a shower, then the maximum tem-
perature was limited during the installation of the appliance and can not be changed.

8Installation instructions & user manual
9120-34378 v1.00 Sept 2020 - ZIP DEX Next / DEX12 Next
Technical support
Tel: [phone] email: ser[email protected].uk www.zipwater.co.uk
3. How to use
Operation Lock: Secure your settings with a four-digit PIN.
Note: The operation lock can only be deactivated with the correct PIN under
“Protected Sections” or under “Delete PIN”. If you should forget your PIN, please
contact Customer Services.
PIN Entry: Use or to select digits from 00 to 99. To move to the next or previ-
ous digit, select or . Once you have selected both digits, confirm by . The
PIN must be reentered and confirmed by “OK” as a security measure.
If both entries match, you can access the section “Protected Sections”.
Protected Sections: Select the areas for a PIN lock.
• Lock Settings: Automatically active as soon as a password has been generated.
Users can only access the settings menu with a PIN. Deactivating it deletes the cur-
rent PIN.
• + Lock Main Menu: Users can only access the main menu with a PIN
• + Lock Temperature: The outlet temperature is set to the current value and can only
be changed with a PIN. User profiles and applications can also only be changed with
a PIN.
Electricity price (currency/kWh): Specify the electricity price of your own electricity
supplier.
Water price (currency/m³): Specify the water price of your own water supplier.
Load Shedding (no function for DEX12 Next): If further three-phase appliances are
connected, a load shedding relay designed for electronic instantaneous water heaters
(CLAGE no. 82250) can be connected to phase conductor L2. This relay ensures the
operation of the water heater by switching off other consumers until the end of heat-
ing operation.
Select “OK” to activate the edit mode. To set a value of “0”, “1” or “2” press and hold
or for two seconds.
Operating mode 1 must be selected first, thus to check the correct operation of the
load shedding relay at low appliance output (35 degree celsius setpoint and low water
flow rate). Mode 2 must be selected if the load shedding relay flickers.
Note: This mode was set during initial operation to “1” or “2” if a load shedding relay
is installed. If mode »1« is active, only an increase to mode »2« is possible.
Factory Settings: All factory settings can be recalled. Temperature limit for showering
and load shedding are not affected.
Note: All customised user profiles and power and water prices entered, are deleted.
Delete Statistics: Use this function to delete all previously collected statistical data.
Deleted statistical data cannot be restored.
Value Description
0Operation without load shedding
relay, factory setting
1Operation with normal
load shedding relay
2Operation with sensitive
load shedding relay

9Installation instructions & user manual
9120-34378 v1.00 Sept 2020 - ZIP DEX Next / DEX12 Next Technical support
Tel: [phone] email: ser[email protected].uk www.zipwater.co.uk
3. How to use
User
Each of the four user profiles can be provided with their own profile image. This image
appears in the main screen.
In the main screen, every user can set up and save his own desired temperatures for
the different applications.
Device Information
The current status and appliance data are listed here. Use the sensor keys to scroll
through the different information values.
• 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 (e.g. jet regulators and shower heads)
should be unscrewed and cleaned at regular intervals. Every three years, the electri-
cal and plumbing components should be inspected by an authorised professional in
order to ensure proper functioning and operational safety at all times.
Cleaning and maintenance
When operating with preheated water (e.g. with solar systems), you must ensure that
the inlet temperature does not exceed 70 °C.
If the inlet temperature exceeds the setpoint, the appliance is not providing any out-
put. The symbol is displayed in the main screen
Top-up heating
Set the exact temperature you need on the appliance and open the hot water tap.
Once you feel that the water is too hot, do not add any cold water and, instead, enter
a lower temperature on the appliance. If you were to add cold water, the water already
heated would cool down again and valuable energy would be wasted. Moreover, the
cold water added in the tap is not covered by the control range of the electronic cir-
cuitry, with the result that temperature constancy is no longer guaranteed.
How to save energy
This instantaneous water heater features an automatic air bubble protection to prevent
it from inadvertently running dry. Nevertheless, 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 re-vented 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 re-connect 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

10 Installation instructions & user manual
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Technical support
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This instantaneous water heater was manufactured conscientiously and checked sev-
eral times before delivery. Should malfunctions nevertheless occur, it is usually only
due to a bagatelle. First attempt to switch the house fuses off and on again in order to
reset the electronics. Next, try to remedy the problem with reference to the following
table. In doing so, you will avoid unnecessary expense of customer service assistance.
DEX Next
Problem Cause Solution
Water stays cold,
touch display shows
power break
screen
Master fuse tripped Renew or activate fuse
Safety pressure cut-out
tripped Contact customer service
Water stays cold, dis-
play shows
error symbol
The appliance has
detected an error
Switch fuses off and on. If sym-
bol “wrench” is still indicated,
contact customer service
Flow rate of hot
water too weak
Outlet fitting dirty or
calcified
Clean shower head, jet regula-
tor or sieves
Fine filter dirty or calci-
fied
Let clean fine filter by customer
service
Selected temperature
is not reached
Power limit reached Decrease the warm water flow
at the tap
Cold water has been
added via the tap
Tap hot water only; set temper-
ature, check outlet temperature
Sensor keys does not
respond correctly or
only sporadically
Display glass is wet Dry display by wiping it with a
soft cloth
4. Trouble-shooting and service
• Repairs should only be carried out by
competent persons familiar with elec-
tric instantaneous water heaters.
• All service work should be performed
by an authorized Zip service engineer
– for details of the full range of ser-
vices available call Zip on 0345 6 005
005.
• When calling for service, please always
specify the appliance model and serial
number.

11Installation instructions & user manual
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5. Product data sheet in accordance with EU regulation - 812/2013 814/2013
a b c d e f h i
b.1 b.2 ηWH AEC °C LWA
%kWh dB(A)
Zip Inline DEX Next 5E-270P-3D S A 38 482 60 15
Zip Inline DEX 12 Next 5E-115G-3D XS A 39 472 60 15
Explanations
aBrand name or trademark
b.1 Model
b.2 Type
cSpecified load profile
dEnergy-efficiency class
eEnergy-efficiency
fAnnual power consumption
gAdditional load profile, the appropriate energy-efficiency and the annual power consumption, if applicable
hTemperature setting for the temperature controller
iSound power level, internal
Additional notes
All specific precautions for assembly, installation, maintenance and use are described in the operating and installa-
tion instructions.
All data in this product data sheet are determined by applying the specifications of the relevant European direc-
tives. Differences to other product information listed elsewhere may result in different test conditions.
The power consumption was determined in compliance with standardized measurement method based on EU
guidelines. The real energy consumption is pending on individual requirements.

12 Installation instructions & user manual
9120-34378 v1.00 Sept 2020 - ZIP DEX Next / DEX12 Next
Technical support
Tel: [phone] email: ser[email protected].uk www.zipwater.co.uk
6. Warranty
The Zip appliance you have chosen is precision-built from the finest materials available and should give many years of trouble free
service.
Certain warranties may be implied by law into your contract with Zip. The warranty provided below is additional to these implied
warranties and nothing set out below shall limit your statutory rights or rights at law.
Zip Water UK warrants that, should any part fail within 12 calendar months of installation, that part will be repaired or replaced free
of charge by Zip or its Distributor or Service Provider, except as set out below, provided the appliance is installed and used strictly
in accordance with the instructions supplied, and that failure is not due to accident, misuse, abuse, unsuitable water conditions, or to
any alteration, modification or repair by any party not expressly nominated by Zip.
No costs are payable by the customer other than any mileage or travelling-time charges incurred by a Zip Service Provider or the
cost of removal, cartage and re-installation of any component of the appliance if it needs to be returned for repair to Zip or its
Distributor.
This warranty does not cover damage resulting from non-operation of the appliance or consequential damage to any other goods,
furnishings or property.
Zip does not exclude, restrict or modify any liability that cannot be excluded, restricted or modified or which cannot, except to a
limited extent, be excluded, restricted or modified as between the owner or user and Zip under the laws applicable.
Furthermore, this warranty does not displace any statutory warranty, but, to the extent to which Zip is entitled to do so, the liability
of Zip under any statutory warranty will be limited at Zip’s option to the replacement of the appliance or supply of equivalent appli-
ance, the payment of the cost of replacing the appliance or acquiring an equivalent appliance, or the payment of the cost of having
the appliance repaired or the repair of the appliance.
Note It is our policy to continually improve products and as such we reserve the right to alter data, specifications and component
parts without prior notice.
To ensure you have the latest revision of this instruction manual, please visit www.zipwater.co.uk to download the latest copy.
IMPORTANT
No liability is accepted for incorrect use of this product.

13Installation instructions & user manual
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Connecting pipe
PCB cover
PCB
Safety pressure cut-out
SDB
Connecting terminal
DEX Next: 3~ /PE
DEX 12 Next: 1~/N/PE
Frame
Cold water connection
Fine filter
Water splash protection sleeve
DEX Next hood
Non-return valve
Flow sensor
Thermal sensor
Thermal sensor
Outlet pipe
Bottom part
Wall bracket
Hot water connection
Flow limiter
1. Overview
Safety thermal cut-out
Heating element
Inlet pipe
Control panel with
bracket
Installation instruction
GrommetScrew-in nipples ½inch

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2. Technical specifications
3. Dimensions
100
170
468 363
56
96
239
Dimensions in mm
Model DEX12 Next DEX Next
Energy efficiency class A *)
Rated capacity / rated current 8.8 kW..11.5 kW (38 A..50 A) 18 kW..27 kW (26 A..39 A)
Chosen capacity / current 8,8 kW / 38 A
11.5 kW / 50 A 18 kW / 26 A 21 kW / 30 A 24 kW / 35 A 27 kW / 39 A
Electrical connection 1/N/PE 220 V .. 240 V 3~ / PE 380..415 V AC 3~ / PE
400 V AC
Min. required cable size 1) 10.0 mm210.0 mm24.0 mm24.0 mm26.0 mm26.0 mm2
Hot water (l/min)
max. at ∆t = 28K
max. at ∆t = 38K
4.5
3.3
5.9 2)
4.3
9.2 2)
6.8
10.7 2)
7.9
12.3 2)
9.0 2)
13.8 2)
10.2 2)
Rated volume 0.4 l
Rated pressure 1.0 MPa (10 bar)
Connecting type pressure-resistant / pressureless
Heating system Bare wire heating system IES®
@ 15 °C:
Required specific water resistance
Specific electrical conductivity
≥ 1100 cm
≤ 90 mS/m
Inlet temperature ≤ 70 °C
Flow rate to switch on – max. flow rate 1.5 l/min – 5.0 3) 1.5 l/min – 8.0 3)
Pressure loss 0.08 bar at 1.5 l/min 1.3 bar at 9.0 l/min 4)
Temperature range 20 °C – 60 °C
Water connection G ½inch
Weight (when filled with water) 4.2 kg
VDE class of protection I
Type of protection / safety IP25
*) The declaration complies with the EU regulation No812/2013.
1) Maximum applicable cable size is 10mm2at electrical connection from above (DEX Next only)
2) Mixed water
3) Flow rate limited to achieve optimum temperature rise
4) Without flow regulator

15Installation instructions & user manual
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For installations under difficult conditions, these mounting accessories are available:
Mounting frame kit RDX3
(Art. no. 36100)
The instant water heater can be installed 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.
When using the RDX the protection class changes from IP25 to IP24.
The following regulations must be observed:
• e.g. VDE 0100
• EN 806
• 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
4. Installation
Mounting accessories
Extension kit VDX
(Art. no. 34120) – RDX / RDX 3 is necessary! –
The instant water heater can be installed 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
(Art. no. 34110) – RDX / RDX 3 is necessary! –
The instant water heater can be installed 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.
RDX3
VDX
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Installation site
• Appliance must only be installed in frost-free rooms. Never expose appliance to
frost.
• The Appliance must be wall mounted and has to be installed with water connectors
downward or alternative transversely with water connections left.
• The appliance complies with protection type IP25 and may therefore be installed in
protection zone 1 according to VDE 0100 part 701 (IEC 60364-7).
• In order to avoid thermal losses, the distance between the instantaneous water
heater and the tap connection should be as small as possible.
• The appliance must be accessible for maintenance work.
• Plastic pipes may only be used if they conform to DIN 16893, Series 2.
• The specific resistance of the water must be at least 1100 cm at 15°C. The specific
resistance can be asked for with your water distribution company.
• When considering the location of the heater, consideration should be given to the
safe and visible disposal of any water resulting from leaks and seepage. This is par-
ticularly relevant when the heater is located in a cupboard or any concealed loca-
tion. For guidance please call Zip on 0345 6 005 005.

16 Installation instructions & user manual
9120-34378 v1.00 Sept 2020 - ZIP DEX Next / DEX12 Next
Technical support
Tel: [phone] email: ser[email protected].uk www.zipwater.co.uk
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 brack-
et, 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 12mm hexagon socket screw key, screw the screw-in nipples into the wall
connections. The seals must be fully screwed into the thread. After tightening, the
double nipples must protrude by 12 – 14mm.
2. Hold the included mounting template on the wall and align it so that the holes in the
template fit over the double nipples. Mark the drill holes according to the template
and drill them using a 6mm drill. Insert the included dowels.
3. Pull down the faceplate and unscrew the main hood screw to open the appliance.
4. Loosen the knurled nut to remove the wall bracket and screw the wall bracket to
the wall. Offset tiling or uneven surfaces can be compensated by up to 30mm with
the aid of the spacers supplied. The spacers are fitted between the wall and the wall
bracket.
4. Installation
Note: Fasten the screw nuts with caution, to avoid damage to the valves or the piping
system.
• As shown in the illustration, screw the cold water connection piece with the union
nut and the ½inch seal onto the cold water connection.
• Screw the hot water connection piece with the union nut and the ½inch seal onto
the hot water connection.
Installing connection pieces
Installing the wall bracket
cold
warm
• Put the water flow reducer “D” into the hot water connection piece.
D

17Installation instructions & user manual
9120-34378 v1.00 Sept 2020 - ZIP DEX Next / DEX12 Next Technical support
Tel: [phone] email: ser[email protected].uk www.zipwater.co.uk
• The electrical power supply cable may be connected in the upper part or is surface
mounted. Only in such case, first follow the steps one through three according to
the description “Electrical connection from above” in chapter “Electrical connec-
tion”.
1. Place the appliance on the heater bracket so that the threaded rod of the wall
bracket fits in the corresponding hole of the appliance. If necessary, slight cor-
rections 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 appli-
ance without applying force.
2. Screw the plastic knurled nut onto the threaded rod of the wall bracket.
3. Screw the two ⅜inch union nuts of the appliance‘s water connection pipes, each
with the ⅜inch seal, onto the fittings.
4. Installation
Installing the appliance
(a)
closed
open
4. Open the water supply line to the unit and slowly open (position “open“) the shut-
off valve (a) in the cold water connection piece. Check all connections for leaks.
5. Next, open and close the hot water tapping valve several times until no more air
emerges from the line and all air has been eliminated from the instantaneous water
heater.

18 Installation instructions & user manual
9120-34378 v1.00 Sept 2020 - ZIP DEX Next / DEX12 Next
Technical support
Tel: [phone] email: ser[email protected].uk www.zipwater.co.uk
5. 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inch screw-in nipples and the ½inch seals must be
screwed into the ½inch union nuts of the hot-water and cold-water connectors. The
two ½inch 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. Put the water
flow reducer “D” into the hot water connection piece. The hot-water and cold-water
connectors must then be screwed into the ⅜inch union nut of the appliance inlet and
outlet pipe, together with the ⅜inch seals.
For direct connection, it may be advisable to mount the appliance at a distance as illus-
trated alongside, using the spacer sleeves supplied. The two fixing holes near the lower
pipe connections are also to be professionally fixed with 6mm dowels and screws.
The flared end of the pipes must be screwed into the ½inch side outlets of the hot-
water and cold-water connectors with ½inch union nuts and ½inch seals. The holes
required for the pipes must then be opened of the housing with the aid of a blunt
implement.
In case of direct connection please note: Put the strainer into the cold water connec-
tion!
D

19Installation instructions & user manual
9120-34378 v1.00 Sept 2020 - ZIP DEX Next / DEX12 Next Technical support
Tel: [phone] email: ser[email protected].uk www.zipwater.co.uk
Load shedding relay (DEX Next only)
If further three-phase appliances are connected, a load shedding relay designed for
electronic instantaneous water heaters (IN. 82250) can be connected to phase con-
ductor L2.
To change the operating mode, after making the electrical connection and the initial
operation call up the settings menu. Then select the point “Load shedding”.
Select “OK” to access the edit mode. To set a value of “0”, “1” or “2” press and hold
or for two seconds. By plugging the jumper in accordance with the locking
function (see chapter »7.Initial operation« section »Locking function«) the load shed-
ding is activated.
Value Description
0 Operation without load shedding relay, factory setting
1 Operation with normal load shedding relay
2 Operation with sensitive load shedding relay
Operating mode 1 must be selected first, thus to check the correct operation of the
load shedding relay at low appliance output (35 degree celsius setpoint and low water
flow rate). Mode “2” must be selected if the load shedding relay flickers.
Only by a specialist!
Please observe:
• e.g. VDE 0100
• 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 specifications
• The appliance must be earthed!
6. Electrical connection
Wiring diagram DEX Next
Wiring diagram DEX12 Next
1. Electronic circuitry
2. Heating element
3. Safety pressure cut-out
4. Connecting terminal
5. Safety thermal cut-out
12
5
3
4
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 with trigger characteristic C must be fitted
with a tripping current commensurate with the nominal current of the appliance.
1
25
3
4

20 Installation instructions & user manual
9120-34378 v1.00 Sept 2020 - ZIP DEX Next / DEX12 Next
Technical support
Tel: [phone] email: ser[email protected].uk www.zipwater.co.uk
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 connection!
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 con-
necting 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 dam-
aged! 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 perfectly
in the recess of the intermediate panel. Adjust the water splash protection sleeve as
illustrated and fix it with the sleeve fixing (A). Reinsert the control panel and lock it
on.
5. Place the hood on the appliance and screw in the fastening screw. After that you
can slide on the faceplate from the bottom up to the stop.
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). For surface-mounted connection cable
additional open the breakout at the right side of the bottom part.
2. Slit the grommet of the accessory set 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. Strip the connection cable so that the sheath extends through the grommet into
the appliance. Hold the prepared appliance so that you can route the cable into the
grommet with the other hand.
4. Place the appliance on the wall bracket so that the threaded rod of the wall bracket
fits in the corresponding hole of the appliance.
5. Open the control panel.
6. Unscrew the fastening screw of the connecting terminal. Displace the connecting
terminal to the upper foot. Affix the connecting terminal again.
7. Strip the individual wires and plug them in the connecting terminals according to
the wiring diagram. The appliance must be earthed.
8. Reinsert the control panel and lock it on.
9. Place the hood on the appliance and screw in the fastening screw. After that you
can slide on the faceplate from the bottom up to the stop.
Note: To ensure IP25 protection class, please don´t remove the bottom water splash
protection sleeve.
6. Electrical connection
Electrical connection from below
Electrical connection from above (DEX Next only)
A
S
DEX Next DEX12 Next