clage Zip InLine Series Manual

1Installation instructions & user manual
9120-34373 v4.00 Nov 2018 - ZIP DBX DEX Technical support
Tel: [phone] email: [email protected].uk www.zipwater.co.uk
Zip
InLine
Installation instructions & user manual
Model number:
DBX, DEX
Electronically controlled instantaneous water heaters.

2Installation instructions & user manual
9120-34373 v4.00 Nov 2018 - ZIP DBX DEX
Technical support
Tel: [phone] email: [email protected].uk www.zipwater.co.uk
CONTENTS
• Please read these instructions carefully before commencing installation of the instantaneous water heater.
• Please leave these instructions with the end user after installation.
• To ensure you have a copy of the latest instructions visit www.zipwater.co.uk.
SAFETY INSTRUCTIONS...................................................................3
GENERAL PRODUCT DESCRIPTION .........................................................5
APPROVALS .............................................................................5
DIMENSIONS ............................................................................5
SPARE PARTS ...........................................................................6
TECHNICAL DATA ........................................................................7
INSTALLATION ...........................................................................8
Requirements ...........................................................................8
Installing the wall bracket ..................................................................9
Electrical connection ....................................................................11
Electrical connection from below ...........................................................12
Electrical connection from above ...........................................................13
COMMISSIONING........................................................................14
Model DBX ............................................................................14
Temperature Adjustment .................................................................14
Model DEX / DEX12.....................................................................14
Selection of power rating .................................................................14
Lock level .............................................................................16
SERVICE MENU .........................................................................16
MAINTENANCE & CLEANING ..............................................................18
Purging after maintenance work............................................................18
OPERATION ............................................................................20
Model DEX / DEX12 only .................................................................20
Temperature setting .....................................................................20
Programme buttons .....................................................................20
How to save energy .....................................................................21
Power limit ............................................................................21
FAULT FINDING .........................................................................22
END OF LIFE DISPOSAL ..................................................................23
WARRANTY ............................................................................23

3Installation instructions & user manual
9120-34373 v4.00 Nov 2018 - ZIP DBX DEX Technical support
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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 regulations.
• 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
electrical 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
physical, 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 hazards 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
original 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
protected 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.

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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
recommended 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 instructions.
!CAUTIONS
• Optimum operation is ensured at a water flow pressure of 0.2 to 0.4 MPa (2-4bar). The
appliance must not be subjected to pressure exceeding 1.0 MPa (10bar).
• 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 thermostatic 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
emptied (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
9120-34373 v4.00 Nov 2018 - ZIP DBX DEX Technical support
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APPROVALS
Zip InLine DEX and DBX are VDE approved to the LVD and EMC directives and are CE marked.
Zip InLine DEX and DBX have been examined, tested and found when correctly fitted to comply with the
requirements of the United Kingdom Water Regulations / Byelaws (Scotland).
The products are listed under the WRAS (Water Regulations Advisory Scheme) Water Fittings and Materials
Directory.
GENERAL PRODUCT DESCRIPTION
The instantaneous water heater DEX / DBX is a electronically controlled, pressure-resistant water heater for a
decentralised water supply to one or more tap connections.
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 pressure fluctuations.
For DEX the required outlet temperature can be entered on a keypad within the range 20 °C to 60 °C (DEX12
range is 20 °C to 55 °C) and can be read off the digital display.
For type DBX the factory set outlet temperature is 50°C and can be adjusted inside the appliance within the
range 30°C to 60°C.
For DEX (*excluding DEX12) a maximum inlet temperature of 70°C is suitable for use with preheated water
from solar heating systems.
*For DEX12 the maximum inlet temperature is 25°C.
DIMENSIONS
231
231
170
363
466
56
100
97
Dimensions in mm

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SPARE PARTS
Connection pack
IN82506
Front cover
DEX & DEX12 IN82620
DBX IN82522
When ordering spare parts, please always specify the appliance model and serial number.
Spares are available, however they may be on a made to order basis.
Fine filter
IN82162
Flow limiter
IN89108 - DEX12
IN89110 - DEX
IN89109 - DBX27
IN89110 - DBX24 & 21
IN89111 - DBX18
Repair kit
IN83212 - DEX12
IN83227 - DEX
IN83127 - DBX27
IN83125 - DBX24
IN83121 - DBX21
IN83118 - DBX18
Non-return valve
IN82246
Flow sensor
IN82526
Thermal sensor
IN82851
Thermal sensor
IN82851
DEX / DEX12 Control panel
IN82550
Wall bracket
IN82520
Safety thermal cut-out
IN82859

7Installation instructions & user manual
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TECHNICAL DATA
Zip InLine
MODEL DEX12 DEX DBX18 DBX21 DBX24 DBX27
Installation pressure-resistant / pressureless
Declared load profile XS S
Energy efficiency class *)A
Energy efficiency (ηwh) *)%40 38
Annual electricity consumption *)kWh 467 484 486 484 483 484
Thermostat / Temperature setting °C 55 60
Sound power level dB(A) 15
Power rating kW 8.8 / 11.5 1)
18/21/24/27
1)
18 21 24 27
Nominal Supply voltage V AC 220 – 240 3/PE 380 – 400 3/PE 400
Rated current A 38 / 50
26/30/35/39 2) 26 30 35 39
Min. required cable size mm² 10 4 / 4 / 6 / 6 2) 4466
Hot water max. at ∆t = 33 K l/min
Rated volume 0,3 l
Rated pressure MPa 1.0
Heating system Bare wire heating system IES®
@ 15 °C:
Required spec. water resistance
Spec. electrical conductivity
Ωcm
mS/m
≥ 1300
≤ 77
≥ 1100
≤ 90.9
≥ 1300
≤ 77
Inlet temperature °C ≤ 25 ≤ 70 ≤ 30
Flow rate to switch on –
max. flow rate l/min 2,5 – 5,0 3) 2,5 – 8,0 3) 2,5 – 7,0 3) 2,5 – 8,0 3) 2,5 – 9,0 3)
Temperature rise at max. flow °C 25 / 33 32/37/42/48 3) 36 37 42 43
Temperature choice °C 20 – 55 20 – 60 30 – 60
Water connection G ½"
Weight (when filled w. water) kg 3.7
VDE class of protection I
Water protection class IP25
Type of protection / safety
*) The declaration complies with the EU regulation No 812/2013
1) Power rating is selected at time of installation
2) Depending on the selected power rating
3) Flow rate limited to achieve optimum temperature rise
The cable size may not exceed 10 mm²
All data quoted at nominal supply voltage. Standard European voltage tolerances of -6 % to +10 % may be applied.
A minimum water pressure of 0.2MPa (2 bar) is recommended for optimum performance.
Maximum flow rate will be achieved at a water pressure of 0.6 MPa (6 bar).
The appliance must not be subject to more than 1.0 MPa (10 bar).
Temperature rise °C = (Nominal power rating (kW) x 14.3)
Flow per minute (litres)
Instantaneous performance calculations

8Installation instructions & user manual
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INSTALLATION
• Appliance must only be installed in frost-free rooms. Never expose appliance to frost.
• The appliances are designed for wall mounted installation and has to be installed with water connectors
downward.
• DEX & DBX models comply with protection type IP25.
• In order to avoid thermal losses, the distance between the instantaneous water heater and the tapping point
should be as small as possible (< 2m).
• For maintenance work, a shut-off valve should be installed in the supply line. The appliance must be
accessible for maintenance work.
• Hot and cold water connecting pipes should be WRAS approved and of copper or steel construction. Plastic
pipes may only be used if they conform to EN 16893, Series 2. The hot water pipes must be thermally
insulated.
• The specific resistance of the water must be at least 1300 Ωcm at 15 °C for DEX12 / DBX and 1100 Ωcm for
DEX. The specific resistance can be asked for with your water supply 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 particularly relevant when the heater is located in a
cupboard or any concealed location. For guidance please call Zip on 0345 6 005 005.
Installation site
Requirements
The following regulations must be observed:
• EN 806
• The installation must comply with current IEE regulations and relevant Local Authority requirements
• The rating plate and technical specifications
• Only functional and appropriate tools must be used during the installation

9Installation instructions & user manual
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INSTALLATION
Fig. 1
Fig. 2
Installing the wall bracket
Installing connection pieces
Thoroughly flush the water supply pipes before installation to
remove any water borne debris.
• 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 tightening, the double nipples must protrude by
at least 12 mm.
• Hold the mounting template (provided) on the wall and align it so that
the holes in the template fit over the connections. Mark the drill holes
according to the template and drill them using a 6 mm drill. Insert the
dowels (provided).
• 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.
Note: Fasten the fittings with caution, to avoid damage to the
valves or the piping system.
• As shown in the illustration, screw the cold water connection (A)
piece with the union nut and the ½ inch seal onto the cold water
connection.
• Screw the hot water connection piece (B) with the union nut and the
½ inch seal onto the hot water connection.
B
A

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INSTALLATION
Installing the appliance
(a)
closed
open
Fig. 3
Fig. 4 Fig. 5
• Remove the appliance cover by first removing the fascia panel
then unscrewing the fixing screw.
• If the power supply cable is to be connected in the upper part
of the appliance follow instructions “Electrical connection from
above”.
• 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 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.
• Screw the two ⅜ inch union nuts of the appliance‘s water
connection pipes, each with the ⅜ inch seal, onto the fittings.
• Screw the plastic knurled nut onto the threaded rod of the wall
bracket.
• 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.
• Ensure that all air is removed from the water heater by
opening and closing the hot water tap until no more air
emerges.

11Installation instructions & user manual
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INSTALLATION
• The appliance must be installed via a permanent
connection.
• Heater must be earthed!
• A maximum cable size must be observed: 10mm2
(16 mm² for DEX12).
• Take care to protect the wiring from damage during
installation and ensure that the wiring is not directly
accessible after installation.
• 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 protected by a suitably
rated RCD.
Structural prerequisites
Electrical connection
Wiring diagram
Fig. 7
Fig. 6
Only undertaken by a competent person familiar with
electric instantaneous water heaters !
Please observe:
• The electrical installation must comply with current IEE
regulations and relevant Local Authority requirements
• The rating plate and technical specifications
• The appliance must be earthed!
1. Electronic circuitry
2. Heating element
3. Safety pressure cut-
out
4. Terminal strip
5. Safety thermal cut-out
21
4
5
3
3-phase
Single phase
21
4
5
3
Note: Fasten the fittings with caution, to avoid damage to
the valves or the piping system.
For surface mount 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. The hot-water and
cold-water connectors must then be screwed into the 3
/8inch
union nut of the appliance and delivery pipe, together with the
3
/8inch seals.
For surface mount connection, it is advisable to mount the
appliance at a distance as illustrated in Fig. 6, 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 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 broken out of the housing with the aid
of a blunt implement.
In case of direct connection please note: Ensure the line
strainer is inserted into the cold water connection!

12 Installation instructions & user manual
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INSTALLATION
Fig. 8
Fig. 9
Load shedding relay (DEX only)
If further three-phase appliances are connected, a load shedding
relay designed for electronic instantaneous water heaters (IN82250)
can be connected to phase conductor L2.
A special operating mode must be selected on the appliance for this
purpose.
To change the operating mode, press the four keys ( , , and
) simultaneously and wait until the desired mode (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 °C setpoint and low
water flow rate). Mode 2 must be selected if the load shedding relay
flickers.
LCD Description
0Operation without load shedding
relay, manufacturer‘s setting
1Operation with normal load
shedding relay
2Operation with sensitive load
shedding relay
Electrical connection from below
3-phase
Single phase
Note: If necessary, the connecting terminal can be moved to
the upper part of the appliance. To do so, please follow the
instructions in the next section.
Check that the power supply is switched off prior to electrical
connection!
• Remove inner and outer insulation from the connecting cable to
the lengths shown in Fig. 9.
• With the smaller opening foremost, slide the water splash
protection sleeve over the connecting cable until the sleeve is
flush with the wall. This prevents any water leaks from coming
into contact with the electrical leads. The protection sleeve must
be fitted and free from damage.
• Open the control panel rightwards.
• Fit the connecting cables into the terminal block according to
the wiring diagrams on page 11. Ensure all connections are fully
tightened and secure.
• 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. Re-fit the control
panel and lock it on the heating element.
• Re-fit the appliance cover and secure with the fixing screw before
re-fitting the fascia panel.

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INSTALLATION
Fig. 10
Electrical connection from above
Check that the power supply is switched off prior to electrical
connection!
• Open the prepared breaking point (S) in the upper part of the
appliance by pressing with a blunt implement (e.g. srewdriver).
• 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!
• Strip the cable roughly 6 cm above the point where it emerges
from the wall. Support the appliance while the cable is routed
through the grommet.
• Place the appliance on the wall bracket so that the threaded
rod of the wall bracket fits in the corresponding hole of the
appliance.
• Open the control panel rightwards.
• Unscrew the fastening screw of the connecting terminal. Move
the terminal block to the upper position, & screw into place.
• Strip the cables and firmly secure them in the connecting
terminals according to the wiring diagram. The appliance must
be earthed.
• Re-fit the control panel and lock it on the heating element.
• Re-fit the appliance cover and secure with the fixing screw
before re-fitting the fascia panel.

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COMMISSIONING
®
Fig. 11
Fig. 12
To prevent damage to the appliance, the instantaneous
water heater must be purged of air before using it for the
first time.
Before connecting the electrical supply, open and close the hot
water tap until the water runs smoothly and no more air emerges.
To ensure a maximum flow, remove any existing aerator from the
tap. Flush the warm and cold water pipes each at least for one
minute.
After every draining (e.g. after work on the plumbing system or
following repairs to the appliance), the heater must be re-purged
in this way before starting it up again.
If the water heater does not function, the temperature cut-out or the
pressure cut-out may have tripped during transport. If necessary, reset
the cut-out.
Model DBX
Note: DBX 27 kW for connection only to 3/PE 400V AC supply.
• Switch on the power supply to the appliance.
• Open the hot water tap. Check the function of the appliance. The
heating element will be activated after approx. 10 - 30 seconds of
continuous water flow.
• Explain operation of the appliance to the end user and leave the
operating instructions for their reference.
• Complete the product registration card and return it to Zip or register
the product at www.zipwater.co.uk/product-registration.
Temperature Adjustment
• The factory set hot water outlet temperature is 50 °C.
• This factory setting can be modified within the range of approx.
30 °C to 60 °C by turning the potentiometer with a slotted
screwdriver as shown in Fig. 12 (width approx. 2 mm).
• The hot water outlet temperature will be decreased by clockwise
rotation and increased by counterclockwise rotation.
Note: The hot water temperature may not exceed 55 °C if the
appliance is connected to a shower.
Model DEX / DEX12
Selection of power rating
Only undertaken by a competent person familiar with electric
instantaneous water heaters.
• Upon first connection of the appliance to the supply voltage, select
the maximum power rating.
• The maximum power rating of the appliance can be selected
from 18, 21, 24 or 27kW (8.8 or 11.5 kW for DEX12) at the time of
installation. The appliance will only commence normal operation
after selection of the power rating. The maximum power rating
should only be selected with reference to the technical data table,
after ensuring that correct cable sizing and fuse protection is in
place and with regard to local site conditions and IEE electrical
DEX Multiple Power System:
The rated capacity (max. power
consumption) is 27 kW / 400 V and
can be changed internally to 24 kW,
21 kW or 18 kW.
DEX12 Multiple Power System:
The rated capacity (max. power
consumption) is 11.5 kW / 230 V and
can be changed internally to 8.8 kW

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COMMISSIONING
regulations.
• Switch on the power supply to the appliance. The digital display
on the appliance must light up.
• When switching on the power supply for the first time, the
value “21“ (“12” for DEX12) flashes in the display. If not, please
carefully read the Re installation section of these instructions.
• Select the maximum allowable power rating depending on the
local situation via the up and down arrow keys.
Note: DEX set at 27 kW for connection only to 3/PE 400V AC
supply.
• Press key to confirm the setting. The appliance starts
operating.
• Mark the set power rating on the rating plate.
• Open the hot water tap. Check the function of the appliance.
• After having set the maximum allowable power rating, the heating
element will be activated after approx. 10 - 30 seconds of water
flow.
• Explain operation of the appliance to the end user and leave the
operating instructions for their reference.
• Complete the product registration card and return it to Zip or
register the product on line at
www.zipwater.co.uk/product-registration.
DEX
DEX 12
Reinstallation
Shower application
Fig. 13
The water heater’s temperature must be limited to 55 °C, if
it is connected to a shower. The service menu parameter
“Temperature Limit“ (“tL”) must be set to a value less or equal
55 °C (in consultation with the customer) and the lock level must
be activated.
When the device is operated with preheated water, it must be
ensured that this temperature is limited to 55 °C as well.
• If the appliance is to be recommissioned under different
installation conditions it may be necessary to alter the
maximum power rating.
• This should only be done by a competent installer.
• To re-set the maximum power rating use a screwdriver
(compliant to EN 60900, current issue) to short circuit the two
pins as shown in Fig. 13.
• This will reset all heater parameters to factory settings.
• Value “21” (“12” for DEX12) will flash in the display panel until
the maximum power rating has been selected.

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COMMISSIONING
Fig. 14
Lock level
The operating mode of the appliance can be restricted.
Activation of the Lock level
• Disconnect the appliance from the power supply.
• Insert the jumper on the power electronics (see Fig. 14).
• Reconnect the power supply to the appliance.
Deactivation of the Lock level
• Disconnect the appliance from the power supply.
• Remove jumper.
• Reconnect the power supply to the appliance.
SERVICE MENU
The service menu offers an overview of system parameters and
is used for diagnostics.
• Press key and key simultaneously for at least 2 seconds to
call up the service menu, the display confirms by “FL” and by a
flashing point. Use the arrow keys and , to switch between
the individual menu items.
• Press key to see the value of the currently selected menu. The
value flashes in the display. (The values of some menus can be
switched over by using the arrow keys and .) Return to the
drop-down-menu by pressing key again. With key return to
the standard display (nominal value). After two minutes without
any key stroke the system automatically switches back to the
standard display.
2
8
4
7
5
3
6
9
+
1
Open service menu
Display flashes
Press
≥ 2 sec

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Menu item order of “Service menu“:
Flow
Power
Temp in
Temp out
Control value
Power limit
Diagnostics
Lock level
Software version
Radio channel
Received strength
Backlight
Temperature limit
Signal
Flow: Flow rate (l/min)
Power: Power consumption (kW)
Temp in: Inlet temperature (°C)
Temp out: Outlet temperature (°C)
Control value: Calibration value of the control system (40 - 60)
Power limit: Maximum power setting (kW)
Diagnostics: Last ten diagnostic messages (see below)
Lock level: Current lock level setting (see below)
Software version: Installed software version
Radio channel: Radio channel of heater and remote control
Received strength: Signal quality of remote control (10% - 100%)
Backlight: Display illumination can be activated and deactivated
Temperature Limit: Set maximum temperature limitation (°C)
Signal: Quality of radio contact with diagnostic display
SERVICE MENU
“Er“: Diagnostics
Indication of the last ten diagnostic messages.
The error code is indicated by the first displayed value after pressing key (refer to “Trouble-Shooting &
Diagnostics” in the front cover). By using the arrow keys and the last 10 error codes are displayed
chronologically. The display indicates in turn the error numbers from “0” to “9“ and the corresponding error. The
last error will be recorded at position “0” and the former ones each shifted 1 position backwards.
“LL“: Lock level
Setting Options:
• “0” no restriction (factory setting).
• “1” Disables “Reset to factory setting”. Parameters can be seen, but not be modified in setup menu.
• “2” As “1”, additionally service menu cannot be displayed.
• “3” As “2”, additionally program 1 and 2 set temperature values cannot be changed.
• “4” As “3”, additionally set temperature value on appliance cannot be changed.
Note: When lock level 1, 2, 3 or 4 is selected the system parameters cannot be modified in the service
menu.
In order to modify system parameters it is necessary to remove the jumper from the main PCB as
described under “Deactivation of the lock level”.
“bL“: Backlight (optional)
Setting options:
• “0” Backlight always on.
• “1” Backlight switches on automatically, if button is pressed, or water is heated (preset).
• “2” Backlight always off.
“tL”: Temperature limit
• The maximum setable temperature can be reduced to any value within the temperature limit.
• The Lock Level must be activated by placing the jumper to enable the limitation.

18 Installation instructions & user manual
9120-34373 v4.00 Nov 2018 - ZIP DBX DEX
Technical support
Tel: [phone] email: [email protected].uk www.zipwater.co.uk
MAINTENANCE & CLEANING
General cleaning
Purging after maintenance work
This instantaneous water heater features an automatic air bubble protection system to prevent it from
inadvertently running dry. Nevertheless, the appliance must be purged of air 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-purged before it is used again.
• Disconnect the instantaneous water heater from the mains power supply.
• Unscrew the jet regulator on the outlet fitting and open the cold water tap valve to flush out the water pipe
and avoid contaminating the appliance or the jet regulator.
• 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.
• Only then should you re-connect the power supply again to the instantaneous water heater and screw the jet
regulator back in.
• The appliance activates the heater after approx. 10 seconds of continuous water flow.
• 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. Periodically, the electrical and plumbing components should be inspected
by an authorised professional in order to ensure proper functioning and operational safety at all times.
Note: Maintenance work must only be carried out by a competent person familiar with instantaneous
water heaters.
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:
• Disconnect the instantaneous water heater from the mains power
supply and take steps to prevents its inadvertent re-connection.
• To open the cover, take off the small fascia plate, loosen the screw
behind this fascia plate to remove the cover.
• Close the shut-off valve (a) in the cold water connection piece
(position “closed“).
• Unscrew the screw plug (b) from the cold water connection piece
and take out the strainer (c).
• The strainer can now be cleaned or replaced.
• After fitting of the clean strainer tighten the screw plug.
• Slowly reopen the shut-off valve in the cold water connection piece
(position “open“).
• Vent the appliance by carefully opening and closing the warm water
tap several times until air no longer emerges from the pipe.
• Re-fit the front cover. Then switch on the power supply.
(a)
closed
open
(c)(b)
Strainer
Fig. 16
Fig. 15

19Installation instructions & user manual
9120-34373 v4.00 Nov 2018 - ZIP DBX DEX Technical support
Tel: [phone] email: [email protected].uk www.zipwater.co.uk
MAINTENANCE & CLEANING
Fig. 17
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 replace the strainer as follows:
• Disconnect the instantaneous water heater from the mains power supply
and take steps to prevents its inadvertent re-connection.
• Close the shut-off valve in the mains water supply of the instantaneous
water heater.
• To open the cover, take off the small fascia plate, loosen the screw
behind this fascia plate to remove the cover.
• Unscrew mains water inlet from connection piece and take out the
strainer.
• The strainer can now be cleaned or replaced.
• After refitting the clean strainer reconnect the mains water inlet to the
connection piece.
• Slowly reopen the shut-off valve in the mains water supply.
• Vent the appliance by carefully opening and closing the warm water tap
several times until air no longer emerges from the pipe.
• Re-fit the front cover. Then switch on the power supply.

20 Installation instructions & user manual
9120-34373 v4.00 Nov 2018 - ZIP DBX DEX
Technical support
Tel: [phone] email: [email protected].uk www.zipwater.co.uk
OPERATION
Temperature setting
Model DEX / DEX12 only
Set temperature
1
–1 °C +1 °C
Select preset temperature
A1 A2
B1 B2
Store temperature
2
Press
≥ 3 sec
Display of new value (e.g. 43 °C)
Set required
temperature
(e.g. 43 °C)
4 3
1
• Set the required temperature gradually to a lower or higher value
with the arrow keys and . The temperature changes by 1°C if
key is pressed shortly one time. Pressing a key for a longer time
changes the temperature continuously. You can select the outlet
temperature in a range from 20 °C to 60 °C.
Note: If temperature is set below 20 °C with arrow key the
display shows “--“ and the appliance switches off the heating
function.
Note: If the water heater supplies a shower, the maximum
temperature was reduced during initial operation. This limitation
cannot be exceeded.
Programme buttons
The two programme buttons and allow to quickly select the
preset temperature. When pressing a programme key, the preset
temperature is selected and displayed.
The factory setting for programme is 35 °C and for programme it
is 48 °C. To assign settings for the programme keys:
• Prolonged pressing of the programme key stores the previously
selected temperature. The display changes from ”P1” or “P2“ to the
newly stored temperature value. This newly set temperature is now
available to you each time you press the corresponding program
key.
Temperature limitation
The DEX instantaneous water heater is equipped with an optional
temperature limiting function. This scalding protection is deactivated
in the factory setting.
• Switch on: Select the limit temperature, then press and
simultaneously for at least 3 sec. The display briefly confirms the
activation by “HI“.
• Switch off: press program key and simultaneously for at least
3 sec. The display briefly confirms the deactivation by “--“.
Note: By activation of the temperature limit also the programme
keys are limited. Therefore, the fixed values of the programme
keys may be set again after deactivation of the temperature
limitation.
+
Press
≥ 3 sec
12
Temperature limit off
Confirmation
of deactivation
Temperature limit on
+
Press
≥ 3 sec
1 2