Stiebel Eltron CNS 50 S 15.09.2008 - 25.01.2009: 1 Operation instructions

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 1  Operation instructions 

for the user and the professional

Use of electrical equipment in principle re-

quires care to exclude any potential risks 

from fire, electrical shock or injury. Therefore 

the unit should only be used as described in 

these instructions, where any use outside the 

manufacturer‘s recommendations can lead to 

damage or injury.

The correct match between the heat require-

ment of the room and the heating power of 

the unit must be observed.

Before use of the unit, read the entire instruc-

tions and follow the information given on pro-

per handling of the unit.

!

These instructions should be kept 

carefully and handed to any subse-

quent user of the unit. Please show them to 

the engineer performing any repair work.

1.1 Description

The CNS is an electric direct heater exclusi-

vely for wall installation. It is suitable e.g. for 

heating a bathroom or as transitional or addi-

tional heating for small rooms such as hobby 

rooms or guest rooms.

Series CNS-S

After wall mounting and electrical connection 

via a plug and socket, the unit is ready for use.

Series CNS-U

After wall mounting and electrical connection 

via a fixed connection through a junction box 

(note national regulations), the unit is ready 

for use.

Function

The air in the convector is heated by a heating 

element and emerges by natural convection 

at the top through the air outlet grille (

4

). The 

openings in the underside of the unit provide 

it with cool room air

Safety device

The convector has a protective thermostat 

(STR) which switches the appliance off on

overheating. After eliminating the cause (e.g. 

covered air outlet or inlet opening), after a 

cooling down period of a few minutes the unit 

resumes operation.

1.2 Operation

The convector is switched on and off via the 

switch (

1

) on the right-hand side. The desired 

room temperature is set via the temperature 

selector (

2

) anywhere between around +6°C 

and +30 °C. As soon as the set room tem-

perature has been reached, it is maintained 

constantly by intermittent heating (the heating 

power of the unit must correspond at least to 

the heat requirements of the room).

If several heaters are fitted in a room, the tem-

perature setting on each unit may vary.

To avoid excessive energy consumption with 

the windows open, the unit should be swit-

ched off during ventilation at the switch (

1

).

Frost protection

If the unit is used as a frost guard, set the tem-

perature selector (

2

) to the far right stop (*). In 

this position the thermostat switches the hea-

ting on automatically if the room temperature 

falls to around +6°C.

Limiting the thermostat

Using the two pins on the back of the switch 

housing (

3

), the thermostat can be fixed in a 

particular setting.

3

3

2

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To fix a desired temperature, push pin 

a

 into 

the hole opposite.

To limit the temperature adjustment range, 

set the minimum and maximum values on the 

selector knob and mark these by inserting pin  

b

 into the opposite, slightly offset hole each 

time.

1.2.1 External 

room 

thermostat

If necessary the unit can be operated with a 

commercial external room thermostat. The 

temperature selector (

2

) must be turned to the 

right stop (

MAX

). The room thermostat should 

be located as far as possible from the unit and 

at least 1.5 m high.

1.2.2 Shutting 

Down 

To shut down the unit, move the switch to the 

OFF position and remove the mains plug from 

the wall socket (do not pull out the plug using 

the lead).

1.3 Safety  notes

The unit should not be  

operated 

–  in rooms at risk of explosion or fire from 

chemicals, dust, gas or vapour,

–  in the immediate vicinity of pipes or 

containers which transport or contain 

flammable or explosive substances,

–  if the minimum distances from adjacent 

object surfaces are not observed.

  Installation (electrical installation), first 

operation and maintenance of this unit 

may only be performed by an accredited 

expert according to these instructions.

  The unit must not be operated if in the 

same room work is performed such as 

floor laying, grinding, sealing, cleaning 

with petrol and care (spray, beeswax) and 

similar.

  The housing surfaces of the unit and the 

emerging air are hot during operation 

(over 80 °C).

Do not Cover! 

Risk of burns!

Keep small children away from the unit.

  If it is intended that children or persons 

with restricted physical, sensory, or mental 

capacity should operate the appliance, 

it must be ensured that this is only done 

after appropriate instruction has been 

provided by the person responsible for 

their safety. Children should be supervised 

to ensure that they do not play with the 

device.

  Do not place objects on the unit, lean 

objects against it or store anything bet-

ween the heater and the wall (e.g. drying 

washing).

Also do not place in the immediate vicinity 

of the unit any flammable, combustible or 

heat-insulating objects or substances such 

as laundry, blankets, newspapers, contai-

ners of beeswax or petrol, spray cans or 

similar. Risk of explosion!

To prevent overheating of the unit, it 

must not be covered.

A

 For objects of all types e.g. furniture, 

curtains, hangings or textiles or other 

flammable or non-flammable materials, 

the following minimum distances from the 

unit must be observed: 

To the air outlet grille 

⇒

 500 

mm 

To the sides 

⇒

 100 

mm 

To the top 

⇒

 150 

mm 

To the underside 

⇒

 100 

mm 

To the back wall 

⇒

 26 

mm 

Hot air must be able to escape  

unobstructed. 

Important features in brief

1

 On/off 

switch

2

Temperature selector button

3

 Locking 

pin

3