GERMAN CEX9-U Instantaneous Water Heater User Manual

GERMAN CEX9-U Instantaneous Water Heater

Overview

When ordering spare parts, please always specify the appliance model and serial number.

Safety Instructions

Warning
Please read these instructions carefully before installing or using the appliance! Keep the instructions handy with the appliance for future use!

Part1-11 is intended for the specialist who is responsible for the installation of the appliance. Part2, 12 and 13 are for the end user. The provided manuals correspond to the technical specifications of the appliance.
The latest version of the instructions can be found online at German Pool website.

• Do not use the appliance until it has been correctly installed and unless it is in perfect working order.
• The appliance is only suitable for domestic use and similar applications inside closed, frost-free rooms, and must only be used to heat incoming 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.
• Do not remove the front cover under any circumstances before switching off the 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.
• The values stated on the rating plate must be observed.
• 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 can be used by children aged from 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 made 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 damaged by an authorized technician in order to avoid any hazards.
• In accordance with VDE 0700, a circuit breaker with a contact opening gap of at least 3 mm for each pole must be provided on the mains side of the connecting box for appliances with a fixed connection.
• 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 prescribed nominal pressure stated on the rating plate may not be exceeded at any time.
• The required water resistance may not fall below the value stated on the rating plate at any time.
• To observe additionally for pressure less 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 head, jet control and other outlet unit, must be decalcified regularly. Deposits must be removed in 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.

Description of Appliance

The instantaneous water heater CEX9/CEX9-U is a microprocessor-controlled, pressure-resistant hot water heater for a decentralised hot water supply to one or more outlets.
Its electronic control regulates the heating 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 on a keypad and can be read off the digital display.
The maximum inlet temperature can be up to 70°C so that operation in connection with solar heating systems is possible.

Technical Specifications

Hot water (l/min)

max. at ∆t = 25 K

| 3.8| 5.0
Rated volume| 0.3 l
Rated pressure| 1.0MPa (10 bar)
Connecting type| Pressure resistant / Pressureless
Heating system| Bare wire heating system IES ®
Required spec. water resistance @ 15 °C

Spec. electrical conductivity

| ≥ 1100 Ωcm

≤ 90.9 mS/m

Inlet temperature| ≤ 70 °C
Flow rate to switch on – max. flow rate| 2.0 – 5.0 l/min1)
Pressure loss| 0.2 bar at 2.5 l/min

1.3 bar at 9.0 l/min2)

Temperature choice| 20 – 55 °C
Water connection| G ½ inch
Weight (when filled w. water)| 2.7 kg
VDE class of protection| I
Type of protection / safety|

*) The declaration complies with the EU regulation No 812/2013

1. Flow rate limited to achieve optimum temperature rise
2. Without flow regulator
3. The cable size may not exceed 10mm2
4. IP24 for the CEX-9-U
   • Specifications are subject to change without prior notice.
   • If there is any inconsistency or ambiguity between the Chinese versionand the English version, the English version shall prevail.
   • Refer to www.germanpool.com for the most up-to-date version of the User Manual.
   • Under normal working conditions, incoming pressure should not exceed 0.6 MPa. Otherwise, a separate pressure control device is necessary. When incoming water pressure exceeds 0.6 MPa, German Pool will not provide any repair service until a pressure control device is installed.

Dimensions

Typical Installation

Installation

The following regulations must be observed:

• 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.

Installation site

• Appliance must only be installed in frost-free rooms. Never expose appliance to frost.
• The CEX9 is designed for wall mounted installation and has to be installed with water connectors downward; the CEX9-U is designed for undersink installation and has to be installed with water connectors upward.
• The appliance CEX-9 complies with protection type IP25, and IP24 for the CEX-9-U.
• In order to avoid thermal losses, the distance between the instantaneous water heater and the tapping point should be as small as possible.
• For maintenance work, a shut-off valve should be installed in the supply line. The appliance must be accessible for maintenance work.
• Copper or steel connecting pipes may be used. Plastic pipes may only be used if they conform to DIN 16893, Series 2. The hot water pipes must be thermally insulated.
• The specific resistance of the water must be at least 1100 Ωcm at 15°C. The specific resistance can be asked for with your water supply company.

Mounting the appliance

1. Thoroughly rinse the water supply pipes before installation to remove soiling from the pipes.
2. Hold the appliance on the wall, and mark the drill lines at top and bottom, right and left, corresponding to the small notches at the edge of the appliance hood (see bottom figure).
3. Connect the top and bottom marks vertically with each other (A-A).
4. Connect the right and left marks horizontally with each other (B-B).
5. The intersections of these lines are the drill points.
6. Drill the holes using a 6 mm drill. Insert the included dowels and screws. The screws have to protrude 5 mm.
7. Hang up the appliance into the rear hanging openings until it clicks into place.

Installing the appliance

1. Attach the water connection pipes to the appliance’s water connection. Use the ½ inch seals.
2. 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.

Electrical Connection

Wiring diagram

1. Electronic circuitry
2. Heating element
3. Safety pressure cut-out
4. Terminal strip
5. Safety thermal cut-out

Only by a specialist! Please observe:

• 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 unit must be earthed!

Structural prerequisites

• The appliance must be installed via a permanent connection. Heater must be earthed! A maximum cable size must be observed: 10 mm2.
• The electric wiring should not be injured. After mounting, the wiring must not be direct accessible.
• An all-pole disconnecting device (e.g. via fuses) with a contact opening width of at least 3 mm per pole should be provided at the installation end.
• To protect the appliance, a fuse element must be fitted with a tripping current commensurate with the nominal current of the appliance.

Electrical connection
Check that the power supply is switched off prior to electrical connection!

1. Dismantle off the power cable so that you can insert the cable with the cladding through the water splash protection sleeve up to the cord grip into the appliance.

2. Lead the cable through the water splash protection sleeve into the appliance so that one can securely fix the cladding of the cable with the cord grip. If necessary, use one of the three predetermined breaking points for the cable entry (at the right, left or bottom). The protective sleeve prevents water from entering the appliance alongside the connection line.
   The protection sleeve has to be used!

3. Mount the cord grip. The cord grip must be used!

4. Strip the cables and plug them in the connecting terminals according to the wiring diagram. The appliance must be earthed.

5. After successful electrical connection, fit the hood of the unit. Make sure not to jam any cables between the appliance hood and the base part of the appliance.

Initial Operation

Before making the electrical connec tion, fill the mains and the appliance with water by carefully opening and closing the hot water tap in order to vent completely.
To ensure a maximum flow, remove any existing aerator from the faucet. 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-vented in this way before starting it up again.
If the water heater cannot be put into operation, the temperature cut-out or the pressure cut-out may have tripped during transport. If necessary, reset the cut-out.

Selection of power rating
Only by authorised specialist, other wise lapse of guarantee!
Upon first connection of the appliance to the supply voltage, select the maximum power rating. Only after having set the power rating, the heater provides its standard ope ration mode.

The maximum allowable power rating at installation site depends on the local situation. It is imperative to observe all data shown in the table “Technical specifications“, in particular the required cable size and fuse protection for the electrical connection. Moreover, the electrical installation must comply with the statutory regulations of the respective country and those of the local electricity supply company (Germany: DIN VDE 0100).

1. Switch on the power supply to the appliance. The digital display on the appliance must light up.
2. When switching on the supply voltage for the first time, the value “88“ flashes in the display. If not, please carefully read the note “Reinstallation“.
3. Select the maximum allowable power rating depending on the local situation via the up and down arrow keys: 8.8 or 6.6 kW (display: “66“) 230 V.
4. Press key to confirm the setting. The appliance starts operating.
5. Mark the set power rating on the rating plate.
6. Open the hot water tap. Check the function of the appliance.
7. After having set the maximum allowable power rating, the heating element will be activated after approx. 10 – 30 seconds of water flow.

Reinstallation
In case the appliance is commissioned again under different installation conditions during its initial operation, it may be necessary to adopt the maximum power rating. A temporary short-circuit of the two pins, e.g. with a screwdriver acc. to EN 60900 (see figure), will reset all heater parameters to works setting and lock the heating.
Value “88“ flashes in the display until the maximum power rating has been selected. This condition will maintain when activating and deactivating the supply voltage.

Shower application
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.

Lock Level
The operating mode of the appliance can be restricted. The service menu can be used to configure the appliance.

1. Set required lock level in the service menu (refer to chapter “Service menu” in this installing instructions).
2. Disconnect the appliance from the power supply (e.g. by switching off the fuses).
3. Move the jumper on the power electronics from pin 2 to pin 1 (see figure).
4. Put the appliance into operation again.

Deactivation of the lock level

1. Disconnect the appliance from the power supply (e.g. by switching off the fuses).
2. Move jumper from pin 1 to pin 2.
3. Put the appliance into operation again.

How to Use

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.

Temperature setting
You can set the required temperature gradually to a lower or higher value with the arrow keys and .
The temperature changes by 1°C, in the convenience zone between 35°C and 42°C by 0.5 °C, if key is pressed shortly one time. Pressing a key for a longer time changes the temperature continuously.

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 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. You can assign your own 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
This 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 affected. Therefore, the fixed values of the programme keys must be checked after changing the temperature limitation.

Reset to factory setting
All factory settings can be recalled:

How to save energy
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 circuitry, with the result that temperature constancy is no longer guaranteed.

ECO mode
The symbol shows that the appliance works in an energy saving mode (i.e. the momentary energy consumption is subject to the selected temperature and to the flow rate in the energy saving mode.

Power limit
If the full output of the instantaneous water heater does not suffice to heat the tapped quantity of water, this will be indicated by MAX on the LCD (e.g. in winter time, when opening several taps at once). When you reduce the hot water flow rate, stops lighting because the output of the appliance is sufficient to reach the set temperature again.

Top-up heating
When operating with preheated water (e.g. with solar systems), you must ensure that the maximum inlet temperature is not exceeded. If the inlet temperature exceeds the setpoint, the icon on the digital display indicates that the heating power is switched off.

Venting after maintenance work
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 revented before it is used again.

1. Disconnect the instantaneous water heater from the mains (e.g. via deactivating the fuses).
2. Unscrew the jet regulator on the outlet fitting and open the cold water tap valve to rinse out the water pipe and avoid contaminating the appliance or the jet regulator.
3. Open and close the hot water tap until no more air emerges from the pipe and all air has been eliminated from the water heater.
4. Only then should you 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.

Cleaning and maintenance

• Plastic surfaces and fittings should only be wiped with a damp cloth. Do not use abrasive or chlorine-based cleaning agents or solvents.
• For a good water supply, the outlet fittings (special tap aerators and shower heads) should be unscrewed and cleaned at regular intervals. Every three years, the electrical and plumbing components should be inspected by an authorised professional in order to ensure proper functioning and operational safety at all times.

Environment and Recycling
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 accepts electronic scrap. 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 electronic equipment, please contact your dealer or supplier for further information.

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. Using the arrow keys and , you can 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 .) You will get back to the drop-down-menu when pressing key again. With key
you will get back to the standard display (nominal value). After two minutes without any key stroke the system automatically switches back to the standard display.

Individual menu items as follows:

• “FL”: Flow
  Indication of current flow rate given in l/min.

• “Po”: Power
  Indication of current power consumption (kW).

• “t1”: Temp in
  Indication of inlet temperature (°C).

• “t2”: Temp out
  Indication of outlet temperature (°C).

• “CA”: Control value
  Indication of calibration value of the control system. Regular range: 40 – 60.

• “PL”: Power limit
  Indication of the current maximum power rating (kW) of the appliance.

• “Er”: Diagnostics
  Indication of the last ten diagnostic messages.
  The error code is indicated by the first displayed value after pressing key 1 (refer to “Abstract for Trouble-Shooting & Diagnostics” in the hood). By using the arrow keys and the last 10 error codes are displayed chronologically. Thereby the display indicates in turns 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
  The operating mode of the appliance can be restricted.

Setting Options:

“0” no restriction (factory setting)
“1” factory reset via key (countdown) not possible, parameters can be seen, but not be modified in setup menu
“2” same as “1”, additionally the setup menu cannot be opened
“3” same as “2” , additionally nominal value memory 1 and 2 not changeable
“4” same as “3”, additionally nominal value not changeable

Note : When the setting 1, 2, 3 or 4 was chosen, the system parameters can no longer be modified in the service menu.
In order to modify these system parameters, it is necessary to remove the jumper on the power electronics, as specified in the chapter “Deactivation of the lock level”.

Menu item order of “Service menu“:

Menu item order of “Service menu“:

• “nr”: Software version
  Information about installed software version.

• “Ch”: Radio channel
  (with wireless module only)
  Information about the current radio channel of the water heater and its remote control.

• “rS”: Received strength
  (with wireless module only)
  Information about the current signal quality of the remote control as percentage. Depending on the distance between remote control and water heater the value varies between 10% and 100%.

• “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.

• “IIC”: Signal
  Information about the quality of the radio contact when a diagnostic display is connected.

Trouble-shooting and Service

Repairs must only be carried out by authorised professionals.
If a fault in your appliance cannot be rectified with the aid of this table, please contact the service organisation of your importer or the Central Customer Service Department. Please have the details of the typeplate at hand.

This instantaneous water heater was manufactured conscientiously and checked several 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.

Water stays cold, digital display does not light up

| Master fuse tripped| Renew or activate fuse
Safety pressure cut- out tripped| Contact customer service
Water stays cold, digital display does light up| Safety thermal cut- out tripped| Contact customer service
Display flashes error message “Er“| Control system has switched off| Switch fuse off and on. If “Er“ still flashes contact customer service

Flow rate of hot water too weak

| Outlet fitting dirty or calcified| Clean shower head, jet

regulator or sieves

Fine filter dirty or calcified| Let clean fine filter by a specialist
Selected temperature is not reached,            lights| Water flow rate too high| Reduce water flow rate at the tap
Selected temp. is not reached,            does not light| Cold water has been added via the tap| Tap hot water only; set temperature for use

Symbol  lights up

| Inlet temperature exceeding nominal temperature|

Reduce inlet temperature

Appliance heats, the display does not light| Display plug not properly connected| Let fix correct position of display plug by customer service

If the connection cable is damaged, it must be replaced with an original spare cable from the manufacturer by an authorised technician in order to avoid any hazards.
If you cannot rectify the fault with the aid of the troubleshooting table, please contact the customer service.

Quick reference guide

Hong Kong, China
Room 113. Newport Centre Phase II. 116 Ma Tau
Kok Road. Tokwawan. Kowloon. Hong Kong.
Tel: +852 2773 2888
Fax:+852 2765 8215

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