STIEBEL ELTRON DHC 6 Bedienungsanleitung

DHC 3, DHC 4, DHC 6, DHC 8

Unvented small instantaneous water heaters

Operation and installation instructions

Operating Instructions 13

Description of the unit 13

Key facts in brief 13

Installation instructions 14 - 20

Technical data, brief description, 15

installation location, regulations and

provisions

Preparing to install the unit 16

Installing the unit

First start-up 20

Servicing instructions 20

Trouble-shooting 21

Guarantee 21

Installation template 39 - 40

Fig. 1

This water heater must be installed (water and electrical installation), commissioned and serviced by approved

service technicians in accordance with these instructions.

Type Power* 2 l/min 4 l/min 6 l/min 8 l/min 10 l/min

7044.01

Fig. 2

* 230 V Volt supply

Table 1

Operating Instructions

(for the user and the qualified installer)

Legend to Figure 2

1 “Power“ light

êÿ

Unit is heating up

2 “Overheating“ light

êÿ

Unit is

overheating

Description of the unit

The DHC hydraulically-controlled

instantaneous water heater heats the water

while it is flowing through the unit. The

heating power is switched on automatically

in the event of the minimum flow rate

being exceeded. The “Power” light (Fig. 2,

Item 1) indicates that the heating system is

switched on.

Key facts in brief

The DHC is equipped with an overheating

protection system. In the event of

overheating, the heating power will be

switched off, and the “Overheating” light

(Fig. 2, Item 2) will come on. After a

cooling-off phase, the unit will automatically

switch the heating power back on, and the

“Overheating” light will go out. If the unit

is overheating, this indicates that the

incoming water volume is too small

êêêÿ

Open the fitting wider.

The outlet temperature can be reduced by

increasing the flow rate or by mixing in cold

water. The hot water output depends on

the capacity of the unit, the cold water

temperature, and the flow rate.

Table 1 shows the temperature rise of

particular units as a function of the flow

rate. If these volumes are added to the cold

water temperatures which prevail at the

installation location, the particular hot water

temperature in each case can be obtained.

Care

A damp cloth is all that is needed to look

after the housing of the unit. Do not use

any effervescent cleaning agents or agents

with a potentially solvent effect.

Maintenance

Maintenance work may only be

carried out by a qualified installer.

Page 21 provides a summary of faults

which you can deal with yourself.

Temperature increase

DHC 8 8,8 kW _ 32 °C 21 °C 16 °C 13 °C

DHC 3 3,0 kW 22 °C 11 °C 7 °C 5 °C 4 °C

DHC 3 U 3,5 kW 25 °C 13 °C 8 °C 6 °C 5 °C

DHC 4 4,4 kW 32 °C 16 °C 11 °C 8 °C 6 °C

DHC 6 6,6 kW _ 24 °C 16 °C 12 °C 10 °C

DHC 6 S

DHC 6 U 6,6 kW _ 24 °C 16 °C 12 °C 10 °C

Fig. 3

7046.01

DHC 3, DHC 4, DHC 6, DHC 6 S, DHC 8

Installation

instructions

(for the qualified installer)

Composition of the unit (Fig. 3)

Under-sink installation

DHC 3 U, DHC 6 U, DHC 6 S

1Hot water connection G 3/8 *

2Cold water connection G 3/8 *

3Thermostat

4Overheating light

5Power light

6Safety thermal cut-out with reset

button

7Differential pressure switch

8Flow rate adjustment screw

9Terminal strip

10 Rear wall

11 Strain relief unit (only DHC 3 U)

12 Connection cable with plug, 800 mm

long (only DHC 3 U, enclosed)

13 Jet regulator for fitting (only DHC 3 U,

enclosed)

14 Cover

15 Function diaphragm

16 Heating system

* The connection pipe for the DHC 6 S

must be connected during installation.

Over-sink installation

DHC 3, DHC 4, DHC 6, DHC 6 S,

DHC 8

17 Terminal strip

18 Overheating light

19 Power light

20 Safety thermal cut-out with reset

button

21 Differential pressure switch

22 Flow rate adjustment screw

23 Rear wall

24 Cold water connection G 1/2, can be

used for surface installation and

concealed installation

25 Hot water connection G 1/2, can be

used for surface installation and

concealed installation

26 Cover

27 Function diaphragm

28 Heating system

29 Thermostat

Important note

All the information in these

Installation and Operating

Instructions must be followed carefully.

These Instructions provide important

details regarding safety, operation,

installation, and maintenance of the unit.

DHC 3 U, DHC 6 U, DHC 6 S

7045.02

Fig. 4

7052.02

Technical data

DHC 3 U DHC 3, DHC 4, DHC 6, DHC 6 S, DHC 8

DHC 6 U

DHC 6 S

7051.01

Brief description

The Stiebel Eltron DHC instantaneous

water heater is a hydraulically-controlled

pressure unit for heating cold water, with

which one or more water taps can be

supplied; see Table 2.

Installation location

The unit is suitable for the

preparation of hot water (potable

water supply), and is to be installed as far

as possible in unvented areas free of the

risk of freezing, as close as possible to

the water tap (dismantled units are to be

stored so as to be free of any risk of

freezing, since there will always be

residual water left in the unit).

The DHC unit is to be installed

vertically, in accordance with Fig. 4.

Under-sink installation:

DHC 3 U, DHC 6 U, and DHC 6 S.

Over-sink installation:

DHC 3, DHC 4, DHC 6, DHC 6 S and

DHC 8.

Regulations and provisions

– Regulations issued by local energy supply

companies.

– Regulations issued by the water supply

companies concerned.

Other data to be taken into

account:

– Currently-applicable data on the unit

rating plate.

– Technical data.

– Install the unit flush with the wall.

– Piped supplementary heating is not

permissible.

– Water installation material:

Cold water pipe:

Steel or copper

Hot water pipe:

Copper.

– Electrical connection to permanently-

installed leads (except for DHC 3 U with

connection lead).

– The unit must be capable of being

isolated from the mains supply, e.g. by

fuses, with a minimum isolation path of

3 mm.

The unit must be connected to the

safety earth terminal (see Fig. 14).

– Fittings for open units are not permitted.

– Safety valves are not required.

1) External thread

2) DHC 6 S by under-sink installation G 3/8

lSuitable

Table 2

Type DHC 3 U DHC 6 U DHC 3 DHC 4 DHC 6 DHC 8

DHC 6 S

Design Unvented

Weight kg 2,1 2,5 2,0 2,1 2,4 2,4

Protection class as per VDE 1

Rated overpressure bar 10

Capacity l 0,5

Protection mode as per VDE IP 24

Test mark See unit rating plate

Water connection 1) G 3/8 G 3/8 G 1/2 G 1/2 G 1/2 2) G 1/2

Electrical connection 1/N/PE ~ 220 . . . 240 V

Rated power 220 V kW 3,2 6,0 2,7 4,0 6,0 8,0

at 230 V kW 3,5 6,6 3,0 4,4 6,6 8,8

Over-sink installation for --llll

supplying one or two

draw-off points

Switch-on volumes l/min 1,6 2,6 1,6 1,6 2,6 3,0

240 V kW 3,8 7,2 3,3 4,8 7,2 9,6

Under-sink installation for ll--l-

supplying one draw-off point

Switch-on flow pressure

Pressure loss bar 0,25 0,3 0,25 0,25 0,25 0,3

Suitable for cold water l/min > 1,6 > 2,6 > 1,6 > 1,6 > 2,6 > 3,0

Suitable for cold water

up to °C 25 25 30 20 30 25

264 mm

7047.02

100 mm

100 mm G 1/2

104 mm

G 1/2

G 3/8

50 mm

9 mm 280 mm59 mm

270 mm

360 mm

5200 mm 35 mm

12 mm 65 mm

Legend to Fig. 5

Connection dimensions in mm.

1Hot water connection DHC 3 U,

DHC 6 U, DHC 6 S

2Cold water connection DHC 3 U,

DHC 6 U, DHC 6 S

3Hot water connection, DHC,

concealed

4Cold water connection, DHC,

concealed

5Hot water connection, DHC, above

work surface

6Cold water connection, DHC,

above work surface

7Electrical connection DHC 3 U,

with connection cable and mains

plug enclosed with the unit

DHC 6 U connection cable to be

provided by client.

8Electrical connection concealed

(DHC)

9Electrical connection above work

surface (DHC)

10, 11 Securing holes

Fig. 5

Fig. 7

7049.01

Fig. 6

Legend to Fig. 6

13-17 Marked connection apertures in unit

rear wall

13 Electrical connection, top

14 Electrical connection, bottom

(aperture for Item 20 also)

15 Water connection, concealed

16 Water connection, above work

surface

17 Water connection DHC 6 S

Preparing to install the unit

– Release securing screw (Item 17).

– Remove unit cover (Item 18).

– DHC 3, DHC 4, DHC 6, DHC 8

– Break through cable conduits

Installation from above: Item 13

Installation from below: Item 14

– Break apertures for water

connections:

Concealed Item 15

Exposed Item 16.

– DHC 6 S - under-sink installation

– Break through cable conduits

Installation from above: Item 13

Installation from below: Item 14

– Break apertures for water

connections Item 15 and 17.

7048.01

20 18

7050.01

15 15

7057.02

7056.02

Æ4 x 35 mm

Æ4,3 mm

Installing the unit

1. Flush the cold water feed pipe

thoroughly.

2. Install water connection components in

accordance with Figs. 12 and 13

respectively.

3. Cut electrical connection lead to length

as per Fig. 16, and strip off the insulation

(not required for DHC 3 U).

4. Determine the position of the drillholes

with the aid of the installation template

(pages 39 and 40). Press the dowels in

and insert the screws (check the depth

to which the screws are inserted; see

Fig. 8).

Note: When replacing an old DHC unit

(old screw holes can be used), do not

screw in the upper screw until after the

new unit has been fitted ( ).

5. For concealed connections, screw the

water connection into the wall

diaphragm in accordance with Fig. 12.

Guide the unit over the screws and push

downwards ( ).

Straighten the unit and tighten the

screws.

Fig. 9

Fig. 8

min. 4,5 mm

max. 5,5 mm

7055.02

6 mm

Æ4 x 35 mm

Æ6 mm

Æ4 x 35 mm

Æ6 mm

Water connection

Under-sink installation

DHC 3 U, DHC 6 U, DHC 6 S

An example of installation with

conventional pressure fitting (Fig. 10).

Items to be provided by client:

1Blender fitting for sink

2Copper pipe Æ10 mm

3Angle valve

4T-piece

– Establish water connection (use

compression fittings provided, Item 5).

– Connect jet regulator unit, Item 6(only

DHC 3 U, enclosed) to the fitting outlet.

Fig. 12

Fig. 11

7053.01

WW KW

7052.02

min. 46

max. 50

Fig. 10

7051.01

7066.02

G 3/8

Fig. 13

Exposed connection (Fig. 12)

– Screw the unit connection nipple

(Item 11) to the water installation (cold

water and hot water; pay attention to

position and installation depth).

– With the connection apertures broken

through, guide the unit over the

connection nipples on the installation

wall.

– Screw the union nut (Item 12) of the

pipe bend (cold water and hot water)

with the gasket (Item 13) onto the

connection nipple.

Connection above work surface

(Fig. 13)

– Guide the connection nipple (Item 14)

through the break-through points on the

rear wall of the unit, and screw the

union nut onto it with the gasket

(Item 15) at the pipe bend (Item 16).

– Connect surface-mounted installation

(Item 17).

Pos. 18 - 20 only with DHC 6 S:

– The washer (20) must be fitted on both

the hot and cold water connection pipe.

Over-sink installation

DHC 3, DHC 4, DHC 6,

DHC 6 S, DHC 8

Examples of installations with

conventional pressure fitting (Fig. 11).

Items to be provided by client:

7Blender fitting for shower

8Blender fitting for sink

9Copper pipe

10 T-piece

7865.01

WW KW

DHC 3,

DHC 4,

DHC 6,

DHC 6 S,

DHC 8

KW 18

DHC 6 S

DHC 3, DHC 4, DHC 6, DHC 6 S, DHC 8

DHC 3, DHC 4, DHC 6,

DHC 6 S, DHC 8

DHC 3 U, DHC 6 U, DHC 6 S

Electrical connection

Legend to Fig. 14

1Heating element

2“Overheating” monitor light

3“Power” monitor light

4Safety thermal cut-out

5Differential pressure switch

6Thermostat

To provide protection against the

penetration of water, the cable

seal (Fig. 16, Item 8, or Fig. 17, Item 14)

must be used. Cut out the sealing

diaphragm to fit the electric cable.

DHC 3 U (Fig. 16)

– Pass the connection cable provided

(Item 7) through the cable seal (Item 8)

and the strain relief collar (Item 9).

– Establish the electrical connection

(Item 10) in accordance with Fig. 14,

and tighten the screws of the strain relief

collar.

A protective earth contact socket is

required to connect the unit. After

concluding the installation (see page 20),

insert the mains plug.

DHC 6 U (Fig. 16):

– Push in the cable seal (Item 8)

– Establish the fixed-position lead (Item 7)

for the electrical connection (Item 10) in

accordance with Fig. 14

See page 20 for concluding the installation.

DHC 3, DHC 4, DHC 6, DHC 6 S,

DHC 8:

– For concealed installation, the

connection lead must project with

insulation at least 65 mm out of the wall

(Fig. 15).

·Connection in the upper part of the

unit/surface installation or concealed

installation (Fig. 17).

– Slide in the cable seal (Item 14)

– Lay the fixed-location lead (Item 15) for

the electrical connection (Item 16) in

accordance with Fig. 14.

See page 20 for concluding the installation.

Alternative:

·Connection in the lower part of the

unit/surface installation

In the conditions as supplied, the unit is

prepared for electrical connection in the

upper part of the unit (terminal strip

upwards).

– Press the locking device of the terminal

strip (Item 12) downwards, draw the

strip out, and push it into the lower area

(Item 13).

Guide the connection leads sideways

between the differential pressure

switch and the rear wall.

– Slide in the cable seal (Item 8)

– Lay the fixed-location lead (Item 7) for

the electrical connection (Item 10) in

accordance with Fig. 14.

See page 20 for concluding the installation.

Fig. 16

7061.01 7059.01

Fig. 15

Fig. 14

7060.01

1/N/PE ~

220 ... 240 V

7058.01

Fig. 17

9 DHC ... U

DHC 3

DHC 3 U

DHC 4

DHC 6

DHC 6 U

DHC 6 S

DHC 8

115 mm

³65 mm

1/N/PE ~

220 ... 240 V

7062.01

°C

Concluding the installation

(Fig. 19)

Fit the cover, and secure it with the centre

screw (Item 1).

With DHC 3 U, DHC 6 U and DHC 6 S,

the cover can also be secured as an

alternative with the hexagonal-headed

screws provided (Item 2), in the event of

only a small gap pertaining between the

unit and the floor. To do this, the marked

parts of the cover (Item 3) are to be

broken through.

First start-up

(may only be carried out by a qualified

installer)

Before screwing in/switching on

the fuses, all the hot water valves

connected are to be opened sufficiently

for the pipe network and the unit to be

rendered free of air.

– Check that the small instantaneous water

heater is functioning properly.

Adjusting the flow rate (Fig. 18)

In the event of the desired temperature not

being attained, the flow rate can be limited

by means of the adjustment screw (take

note of the data in Table 1). The flow rate

should be adjusted such that the desired

temperature 35 – 40 °C is reached.

Handover of the unit

Explain to the user how the unit works, and

familiarise them with its operation.

– Advise the user about possible hazards

(danger of scalding).

– Hand over these instructions to be kept

in a safe place.

Servicing instructions

Applicable to all maintenance work

disconnect unit from the mains circuit.

– Clean the filter, Fig. 20

Release the earthing screw (Item 4,

approx. 2 turns), unscrew the cold water

connection pipe from the differential

pressure switch (Item 5) turn 90 °, and

remove it downwards. Clean the filter

(Item 6). Assemble in reverse order.

Ensure that the earthing screw

(Item 4) is properly tightened.

– Activate the safety thermal cut-out,

Fig. 21

Once tripped, the safety thermal cut-out

can be reactivated after the fault has

been rectified by means of the reset

button (Item 7). The current to the unit

must be disconnected.

Fig. 19

Fig. 18

7063.01

Fig. 21

Fig. 20

7064.017065.01

Elimination of faults by the user

Fault Cause Rectification

Elimination of faults by the qualified installer

Fault Cause Rectification

No hot water despite the hot water fitting

being fully opened.

The water flow rate required for the system

to switch on has not been achieved (see

Table 2).

– Cleaning or descaling of the flow

regulator in the fitting or in the shower

head.

The differential pressure switch is not

switching the heating on despite the hot

water fitting being fully open.

The water flow rate required for the system

to switch on has not been achieved (see

Table 2).

– Clean the filter (Fig. 20, Item 6) after

shutting off the cold water cable entry.

Despite the appropriate sound being

audible from the differential pressure

switch as if it were switched on, no hot

water is flowing.

– The safety thermal cut-out has switched

the unit off for safety reasons.

– Eliminate the cause of the fault. Press

the reset button on the safety thermal

cut-out (Fig. 21, Item 7). The current to

the unit must be disconnected.

– Dirt contamination or limescale

formation in the flow regulator in the

fitting or in the shower head.

– Filter in differential pressure switch is

blocked.

– Flow rate too small. – Correct the flow rate setting (Fig. 18).

Table 3

Table 4

Overheating light is showing. – Flow rate too small. – Correct the flow rate setting (see Fig. 18

and Table 1).

– Heating element clogged with limescale

(caused by heat thermal cut-out build-up).

– Replace heating element

– Heating element defective. – Replace heating element

Guarantee

For guarantees please refer to the

respective terms and conditions of supply

for your country.

The installation, electrical connec-

tion and first operation of this

appliance should be carried out by a

qualified installer.

The company does not accept liability

for failure of any goods supplied which

have not been installed and operated in

accordance with the manufacturer's

instructions.

Environment and

recycling

Please help us to protect the environment

by disposing of the packaging in

accordance with the national regulations

for waste processing.

Dieses Handbuch passt für folgende Modelle

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