Electronically controlled instantaneous water heater
DEX: 27931 - 60 °C models
Instructions for the user
1. Overview
When ordering spare parts, please always specify the appliance model and serial number.
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MADE IN GERMANY
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Pos. Part.-No. Description
1 801097 Hot water connection
2 Outlet pipe
3 801107 DEX control panel
4 801098
5 801100
6 801101
DSX / DEX thermal sensor set 2.1
Flow sensor
Non-return valve
7 DEX hood
8 Wall bracket
9 Bottom part
10 DBX / DEX connecting pipe
11 801102 PCB cover 2.1
12 Control panel support
13 Connecting terminal
14 Inlet pipe
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2021
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Pos. Part.-No. Description
15 Frame
16 801108
17 801104
Flow limiter 8 l/min
Fine filter
18 801105 Cold water connection
19 Water splash protection sleeve
20 Grommet
21 Screw-in nipples 1/2”
22 801109 Faceplate
not shown:
23 801106 Set of small spare parts
24 Operating foil
Parts in Bold Type are available as Spare Parts.
Other parts are available on request.
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Contents
1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Environment and recycling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
4. Technical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
5. Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
6. Typical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
7. Description of appliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
8. Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
9. Additional features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
10. Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
11. Fault finding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2. Environment and recycling
This symbol on the products and / or accompanying documents means that used electrical and electronic products 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 otherwise 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.
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Instructions for user - 9120-34313 - DEX - 801047 - November 2012 v1.00
3. Safety instructions
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 experience 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.
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Instructions for user - 9120-34313 - DEX - 801047 - November 2012 v1.00
4. Technical specifications
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10,2
2)
2)
Model DEX ELECTRONIC MPS
Part no. 27931 - 60 °C models
Rated capacity / rated current
18 kW..27 kW (26 A..39 A)
Chosen capacity / current 18 kW (26 A) 21 kW (30 A) 24 kW (35 A) 27 kW (39 A)
Electrical connection 3/PE 380..415 V AC 3/PE 400 V AC
Min. required cable size See note 1)
Hot water (l/min)
max. at Δt = 28 K 9,2
2)
10,7
2)
max. at Δt = 38 K 6,8 7,9 9,0
Rated volume 0,4 l
Type Pressure type 1 MPa (10 bar)
Heating system Bare wire heating system IES
Required spec. water
resistance @ 15 °C ≥ 1100 Ωcm
Spec. electrical conductivity ≤ 90 mS/m
Inlet temperature ≤ 70 °C
Flow rate to switch on – max.
flow rate
2,5 – 8,0 l/min
Pressure loss 20kPa at 2,5 l/min 130kPa at 9,0 l/min
Temperature choice 20 °C – 60 °C
Water connection G ½“
Weight (when filled with
water)
3,70 kg
VDE class of protection I
Noise level test certificate PA-IX 6762/I
Type of protection / safety
1) 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.
2) Mixed water
3) Flow rate limited to achieve optimum temperature rise
4) Without flow regulator
IP25
WMKA30016
AS 3498
5. Dimensions
231
170
363
466
Dimensions in mm
97
56
100
231
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Instructions for user - 9120-34313 - DEX - 801047 - November 2012 v1.00
6. Typical installations
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6. Typical installations
363 56
466
550
shut-o
upper edge of the wash basin approx. 850
valve
231
170
rear
cable
entry
100
upper edge of the shower cabin approx. 1950
alternative
rear cable entry
depth of
the unit: 97
min. 10
dimensions in mm
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7. Description of applicance
The instantaneous water heater DEX 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.
8. Operation
Temperature setting
The required hot water temperature can be increased or decreased in increments of 1°C by briefl y pressing the up arrow and down arrow function keys.
Depressing the function key for a longer time changes the temperature continuously.
The temperature can be adjusted between 20°C and 60°C.
Note. Reducing the temperature below 20°C displays ‘- -’ and the heating function will not operate.
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 be-
comes available each time the corresponding program key is pressed.
Set temperature
-1°C
Select preset temperature
A1
B1
Store temperature
Set required
1
temperature
4
+1°C
A2
B2
2
Press > 3 seconds
3
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Instructions for user - 9120-34313 - DEX - 801047 - November 2012 v1.00
9. Additional features
Reset to factory settings
To reset to factory settings press the up arrow and down arrow
function keys simultaneously.
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.
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 DEX heater is insuffi cient to heat the
volume of hot water being drawn off to the required temperature, this will be
indicated by the LCD decimal point on the display.
Reducing the fl ow rate will enable the required temperature to be delivered
indicated by the decimal point remaining solid.
Reset to factory settings
1 2
Press + hold
3
Reset complete
Power limit
Operation with solar systems
Type DEX are 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 70°C.
If the inlet temperature exceeds the set point, the fl ashing decimal point on the
display indicates that the heating power is switched off.
Unit provides no output
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10. Maintenance
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 or chloric 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 competent person to ensure proper functioning and opera-
tional 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.
Cleaning and replacing the fi lter strainer
The cold water connection of the appliance is fi tted with an integral
shut-off valve and fi lter strainer. Soiling of the strainer may reduce
hot water output from the unit.
The strainer should be cleaned or replaced as follows:
Fig 12
1. Isolate the electrical supply to the unit.
2. Remove the appliance cover and close the shut-off valve (see
Fig 12) in the cold water connection piece to position II.
3. Unscrew the screw plug (A) from the cold water connection
piece and take out the strainer (B) (see Fig 13).
4. The strainer can now be cleaned or replaced.
5. After re-fi tting the strainer tighten the screw plug.
6. Slowly open the shut-off valve in the cold water connection
piece to position 1.
7. Vent the unit by carefully opening and closing the hot water tap
several times until all air has been eliminated from the water
heater and no more air emerges.
8. Re-fi t the appliance cover and restore power to the unit.
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Fig 13
Instructions for user - 9120-34313 - DEX - 801047 - November 2012 v1.00
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.
Problem Cause Solution
Water stays cold
Digital display does not light up
Circuit breaker tripped Reset circuit breaker
STCO tripped Contact Zip Service to reset STCO
Display fl ashes error
message ‘ER’
Poor hot water fl ow rate
Control system has switched off
Outlet fi tting dirty or
calcifi ed
Switch power supply off and on. If ‘ER’ still fl ashes
contact Zip Service
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
Decimal point fl ashes
Selected temperature not achieved
Decimal point does not fl ash
Excessive water fl ow rate Reduce water fl ow rate at the outlet
Cold water has been added at the outlet
temperature and tap hot water only
Set for required
Decimal point fl ashes Inlet temperature exceeding set point Reduce inlet temperature
No response to key press Appliance cover not fi tted correctly Contact Zip Service
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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
Programme button 1 Programme button 2
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.
Quick reference guide
Arrow keys up and down
Set temperature
1
–1 °C
Select preset temperature
A1 A2
B1 B2
Store temperature
1
Set required
temperature
(e.g. 43 °C)
+1 °C
2
Press
≥ 3 secs
1
Press + hold!
+
Reset
Power limit
2
3
Unit provides no output
Reset completed
4 3
Display of new value (e.g. 43 °C)
Instructions for user - 9120-34313 - DEX - 801047 - November 2012 v1.00
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