Electronically controlled instantaneous water heater
CEX -U: 27920 - 60 °C models
Instructions for the user
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Instructions for user - 9120-25535 - CEX-U - 801044 - November 2012 v1.00
1. Overview
When ordering spare parts, please always specify the appliance model and serial number.
Pos. Part.-No. Description
1 Grommet
2 Connection terminal
3 801110 Flow sensor
4 801101 Non-return valve
5 801111 PCB CEX / CFX
6 801112 CEX-U control panel
7 Inlet pipe
8 CEX-U cover
Pos. Art.-No. Description
9 Connection piece 1/2“
10 Thermal sensor set
11 Heating element
12 Bottom part
13 801113 Screws and dowels
Parts in Bold Type are available as Spare Parts.
Other parts are available on request.
1
2
3
4
5
6
7
8
9
10
11
12
13
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Instructions for user - 9120-25535 - CEX-U - 801044 - November 2012 v1.00
This symbol on the products and / or accompanying documents means that used electrical and electronic prod-
ucts should not be mixed with general household waste. For proper treatment, recovery and recycling, please take
these products to designated collection points. Alternatively, in some countries you may be able to return your
products to your local retailer upon the purchase of an equivalent new product. Disposing of this product correctly
will help to save valuable resources and prevent any potential negative effects on human health and the environment which could other-
wise arise from inappro priate waste handling. Please contact your local authority for further details of your nearest designated collection
point. Penalties may be applicable for incorrect disposal of this waste, in accordance with national legislation. If you are a business user
and you wish to discard electrical and electronic equipment, please contact your dealer or supplier for further information. This symbol is
only valid in the European Union.
2. Environment and recycling
1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Environment and recycling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
4. Technical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
5. Typical installations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
6. Description of appliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
7. Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
8. Reset to factory setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
9. Additional features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
10. Cleaning and maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
11. Fault finding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Contents
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Instructions for user - 9120-25535 - CEX-U - 801044 - November 2012 v1.00
Installation, initial operation and maintenance of this appliance must only be conducted by an authorised professional, who will then be
responsible for adherence to applicable standards and installation regulations. We assume no liability for any damages caused by failure
to observe these instructions.
• Do not use the appliance until it has been correctly installed and unless it is in perfect working order.
• The appliance is suitable but not limited to domestic use and similar applications inside closed, frost-free rooms, and must only be
used to heat potable water from mains supply.
• The appliance must never be exposed to frost.
• The appliance must be earthed at all times.
• The minimal specific water resistance must not fall below the value stated on the label.
• The maximum water pressure must not exceed the value on the label.
• Before commissioning for the first time and each time the appliance is emptied (e.g. due to work on the plumbing system, if there is a
risk of freezing or in case of maintenance), the appliance must be vented correctly in accordance with the instructions in this manual.
• 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.
• 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.
• Water inlet temperature must not exceed 70 °C.
• In case of malfunction, disconnect the fuses immediately. In case of leaks, cut off the cold water supply instantly. Repairs must only be
carried out by the customer service department or an authorised professional.
• This appliance must not be used by any person (including children) with limited physical, sensorial or mental abilities or failing experi-
ence and/or knowledge unless they are supervised by a person responsible for their safety or received instructions about how to use
the appliance. Children should be supervised in order to make sure that they do not play with the appliance.
3. Safety instructions
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4. Technical specifications
Model
CEX-U
Part no.
27920 - 60 °C models
Rated capacity / rated current
11..13,5 kW (16..19,5 A)
Chosen capacity @ 400 V
11 kW (16 A) 13,5 kW (19,5 A)
Electrical connection
3/PE 380..415 V AC
Min. required cable size
3)
See note 3)
Hot water (l/min) max. at t = 25 K
4,8 5,8
1)
Rated volume
0,3 l
Type
Pressure type 1000kPa (10 bar)
Heating system
bare wire heating system IES
®
Required spec. water
resistance @ 15 °C
Spec. electrical conductivity
≥ 1000 Ωcm
≤ 100 mS/m
Inlet temperature
≤ 70 °C
Flow rate to switch on – max. flow rate
2,0 – 5,0 l/min
2)
Pressure loss
20kPa (0,2 bar) at 2,5 l/min
130kPa (1,3) bar at 9,0 l/min
Temperature range
20 °C – 60 °C
Water connection
G 1/2“
Weight
(when filled w. water)
2,7 kg
VDE class of protection
I
Type of protection / safety
IP24
1) Flow rate limited to achieve optimum temperature rise
2) Without flow regulator
3) The cross sectional area of the connection cable must be in accordance with the power rating of the appliance and the specific requirements
of AS/NZS 3000.
WMKA30016
AS 3498
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Instructions for user - 9120-25535 - CEX-U - 801044 - November 2012 v1.00
5. Typical installations
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Instructions for user - 9120-25535 - CEX-U - 801044 - November 2012 v1.00
6. Description of appliance
The instantaneous water heater CEX -U is a microprocessor-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. The required outlet temperature can be entered between 20 °C and 60 °C and is indicated on the
digital display.
This appliance may be able to be used with a Thermostatic Mixing valve or where serving a fixture that does not require
temperature limitation such as a commercial Kitchen sink or Cleaners sink. Refer to AS/NZS 3500.4.
7. Operation
The appliance switches on automatically when the hot water tap is opened and switches off
automatically when the hot water tap is closed.
Temperature setting
The required outlet temperature can be
adjusted gradually to a higher or lower value with the up arrow and down arrow keys.
Pressing a key once briefl y changes the
temperature by 0.5°C between 35°C and 42°C and by 1°C outside that range.
Pressing a key for a longer time changes the temperature continuously.
The required outlet temperature can be adjusted between 20°C and 60°C.
Note: reducing the temperature below 20°C displays “- -” and the heating function will not oper-
ate.
Program buttons
The two program keys allow a preset
temperature to be selected quickly.
The factory setting is 35°C for program 1 and 48°C for program 2.
The preset temperature can be changed to the current temperature setting by prolonged
pressing of the program key.
The display changes from “P1” or “P2” to the new temperature value which becomes
available each time the corresponding program key is pressed.
Set temperature
35.0 - 42.0°C
A1 A2
B1
B2
Select preset temperature
Store temperatures
2
3
4
1
Set required
temperature
Press >3
seconds
+1 °C
+0,5 °C
-1 °C
-0,5 °C
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Instructions for user - 9120-25535 - CEX-U - 801044 - November 2012 v1.00
To reset to factory settings press the up arrow and down arrow function keys simulta-
neously.
The display will count backwards from “10” to “00” in one second intervals.
The appliance is reset when the counter reaches “00”.
Releasing the function keys earlier will cancel the process.
8. Reset to factory setting
Reset to factory setting
2
3
1
Press +
Reset com-
+
9. Additional features
Energy saving
Set the required hot water temperature on the appliance.
If the water is too hot reduce the temperature on the appliance instead of mixing with
cold water.
Adding cold water wastes valuable energy that has been used producing excessively
hot water.
Also, any cold water added is not controlled by the electronic circuitry meaning that
precise temperature control can no longer be guaranteed when supplying more than
one outlet.
Power limit
If the maximum power available from the appliance is insuffi cient to heat the volume
of hot water being drawn off to the required temperature this will be indicated by
“MAX” on the display.
Reducing the fl ow rate will enable the required temperature to be delivered.
Operation with solar systems
The appliance is suitable for use with solar heating systems providing appropriate
controls are in place to ensure that the temperature of the water entering the unit
does not exceed 70ºC.
If the inlet temperature exceeds the set point, the “SUN” symbol on the display indi-
cates that the heating power is switched off.
Power limit
Energy saving mode
Heating is switched off
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10. Cleaning and maintenance
Problem Cause Solution
Water stays cold
Circuit breaker tripped Reset circuit breaker
STCO tripped Contact Zip Service to reset STCO
Display fl ashes error
message ‘ER’
Control system has switched off
Switch power supply off and on. If ‘ER’ still fl ashes
contact Zip Service
Poor hot water fl ow rate
Outlet fi tting dirty or
calcifi ed
Clean shower head or tap nozzle
Fine fi lter dirty or calcifi ed Contact Zip Service to clean fi ne fi lter
Selected temperature not achieved
‘MAX’ lights up
Excessive water fl ow rate Reduce water fl ow rate at the outlet
Selected temperature not achieved
‘MAX’ does not light
Cold water has been added at the outlet
Set for required
temperature and tap hot water only
Symbol ‘SUN’ fl ashes Inlet temperature exceeding set point Reduce inlet temperature
Water heats up but display fails to
operate
Display lead plug not properly connected
Contact Zip Service to connect display lead
correctly
11. Fault finding
Repairs should only be carried out by qualifi ed tradespersons familiar with electric instantaneous water heaters.
All service work should be performed by an authorized Zip service technician – for details of the full range of services available call Zip
Service on 1800 460 222.
When calling for service, please always specify the appliance model and serial number.
The following table will be helpful in determining the causes of some common problems and their solutions.
N.B. Maintenance work must only be carried out by a qualifi ed tradesperson familiar with instantaneous water heaters.
Plastic surfaces and sanitary fi ttings should only be wiped with a damp cloth.
Never use abrasive cleaning agents or solvents.
Outlet fi ttings (tap nozzles and shower heads) should be unscrewed and cleaned at regular intervals.
The electrical and plumbing components should be inspected regularly by a qualifi ed tradesperson to ensure proper functioning and
operational safety. Water quality should be considered when determining the frequency of inspection.
Each time the appliance is emptied (e.g. due to work on the plumbing system, if there is a risk of freezing or in case of maintenance), the
appliance must be vented 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.
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12. Notes
11. Notizen
11. Notes
11. Notes
11. Notas
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12. Notes
Instructions for user - 9120-25535 - CEX-U - 801044 - November 2012 v1.00
Quick reference guide
MADE IN GERMANY
arrow key down
arrow key up
programme button 1
programme button 2
Head Office
Zip Heaters (Aust) Pty. Ltd.
ABN: 46 000 578 727
67 Allingham Street
Condell Park NSW 2200
Postal: Locked Bag 80
Bankstown 1885 Australia
Website: www.zipheaters.com
Facsimile: (02) 9796 3858
Telephone: (02) 9796 3100
Free Call: 1 800 638 633
As Zip policy is one of continuous
product improvement, changes
to specifications may be made
without prior notice. Images in this
booklet have been modified and
may not be true representations of
the finished goods.
Power limit
+
Reset
1
Press + hold!
Reset completed
3
2
Unit provides no output
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
Convenience zone 35,0.. 42,0 °C
1
–0,5 °C
+0,5 °C
Enter service menu
2
8
4
7
5
3
6
9
+
1
Display flashes
Press
2 sec
12. Quick reference guide
