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CONNECTION TO MAINS
GB
1. The duct heaters are designed to operate on single phase, two phase, or three phase alternating current. See the wiring diagram
for the particular heater and the electrical data on the rating plate placed on the cover of the duct heater.
2. The duct heater must be connected to the mains supply with a fixed installed round cable. The heater must be equipped with a
cable grommet or cable fitting designed for the cable, which ensures that the electrical protection class of the heater is retained.
The standard design is IP43. Electrical protection class IP55 can be delivered if required, in which case this is specified on the
cover of the heater. Design IP55 is delivered with factory-mounted cable fittings.
3. It must not be possible to switch on the power to the element unless the fan has started earlier or starts simultaneously.
4. It must not be possible to switch off the power to the fan unless the power to the element has been switched off earlier or is
switched off simultaneously.
5. An all phase breaker with a contact gap of at least 3 mm must be included in the fixed installation.
6. The installation must be carried out by an authorised electrical fitter.
7. The duct heaters are designed in accordance with the following standards:
SEMKO 111 FA 1982 / EN 60335-1 / EN 60335-2-30.
8. The duct heater satisfy the requirements of the currently valid EMC standard CENELEC EN 50081-1. The heaters are CE-marked
and EMC-marked.
9. The duct heaters are S-marked, tested and approved by SEMKO.
10. The duct heater is equipped with two overheating cut-outs (one with manual reset) designed to prevent overheating when the
airflow is too low or in the event of a fault in the system.
11. A drawing must be attached inside the fuse box or on the wall of the service room. The drawing shows the rating of the duct
heaters and their location in the building, together with information about the measures to be taken in the event that the overheat
protection cut-out(s) is activated.
FITTING
1. The heater is designed for insertion into standard spiral ducting and is fixed to the ducting with screws.
2. The air must flow through the heater in the direction of the arrow (located on the side of the heater close to the connection box).
3. The heater can be fitted in either horizontal or vertical ducting.
The electrical connection cabinet can be freely placed facing upwards or sideways to a maximum angle of 90°.
Fitting with the box facing downwards is NOT allowed.
4. The access opening in the heater must be equipped with a fixed mesh or an intake air device which makes it impossible to
touch the element inside.
5. A warning sign must be attached close to the air outlet, stating that the air outlet must not be covered.
6. The distance from (to) the heater to (from) a duct bend, valve, filter, etc., should correspond to at least twice the duct diameter,
otherwise there is a risk that the airflow through the heater is uneven which can cause activation of the overheating cut-out.
Example: model CB 16 => min. 320 mm, CB 40 => min. 800 mm, etc.
7. The heaters may be insulated in accordance with valid regulations for ventilation ducting. However, the insulation material must be
incombustible. The cover of the heater must be free from insulation so that the type plate is visible and the cover can be removed.
8. The parts of the ventilation system where heaters are installed must be kept accessible to allow replacement and service.
9. The distance from the heater's metal casing to any wood or other combustible material must NOT be less than 30 mm.
10. The maximum ambient temperature allowed is 40°C for heaters without integral control.
11. The maximum ambient temperature allowed is 30°C for heaters with integral control.
12. The air flow through the heater must have a speed of at least 1.5 m/s.
13. The maximum output temperature allowed is 40°C.
MAINTENANCE
No maintenance is required except a periodic functional test.
OVERHEATING
When the overheating cut-out with manual reset has been activated, the following should be observed:
1. The heater must not be interfered with in any way, such as removal of the cover, except by an authorised electrical fitter.
2. Turn off the mains power.
3. Investigate carefully the reason for activation of the cut-out.
4. When the fault has been eliminated, the cut-out can be reset.
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