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Connection to mains
1. The duct heater is designed to operate on single phase, two phase or three phase alternating current. See further the wiring
diagram for the particular heater and the electrical data on the ratings plate, placed on the lid of the duct heater.
2. The duct heater must be connected to the mains supply with a fixed installed round cable. Appropriate cable glands must be
used to retain the electrical protection class. The standard design is IP43. The IP55 design can be manufactured if required,
in which case this is specified on the rating plate. The IP55 design is delivered with factory mounted cable glands.
3. Duct heaters of type -MQ... has a built in electronic interlocking airflow sensor that ensures that the heating elements will not
actuate, unless there is an appropriate airflow through the duct heater. The inlet air must be filtered to reduce the risk of
contamination of the airflow sensor
4. An all phase switch must be included in the fixed installation.
5. The installation must be carried out by an authorized electrician.
6. The heater is S-marked, CE-marked and EMC-marked and designed in accordance with the following standards:
SEMKO 111 FA 1982 / EN 60335-1 / EN 60335-2-30 / EN 61000-6-2 / EN 61000-6-3 / EN 61000-3-11 .
7. The duct heater is equipped with, at least, two overheating cut-outs (of which one is manual reset), to prevent overheating
when the airflow is too low or in case of a fault in the system.
8. 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
heater and its location in the building, together with information about the measures to be taken if the overheating cut-outs is
activated.
9. This appliance is not intended for use by persons (including children) with reduced physical, sensory or mental capabilities, or
lack of experience and knowledge, unless they have been given supervision or instruction concerning use of the appliance by
a person responsible for their safety. Children should be supervised to ensure that they do not play with the appliance.
Fitting
1. The heater is designed to be mounted in a ducting. The heater is meant to be fixed to the ducting by means of screws
or guide joint.
2. The air must flow through the heater in the direction indicated by the arrow on the lid of the connection box.
3. The heater can be fitted in either horizontal or vertical ducting with the connection box facing sideways. Fitting with the
connection box facing upwards or downwards is NOT allowed.
4. The access opening to a room must be equipped with a fixed mesh or an intake air device which makes it impossible to touch
the heating elements, if meshes is not fixed to the heater already .
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 the diagonal dimension
of the heater, i.e. from corner to corner in the duct part of the heater. Otherwise there is a risk that the airflow through the heater
will be uneven which can cause activation of the overheating cut-out. Example: Duct dimension 800x400mm result in a distance
of at least, approximately, 900mm.
7. The duct heater may be insulated in accordance with valid regulations for ventilation ducting. However, the insulation must be
incombustible. The insulation must not cover the lid, since the rating plate must be visible and the lid must be removable.
8. The duct heater must be accessable for replacement and inspection.
9. The distance from the heater metal casing to any wood or other combustible material must be less than 100mm.
10. The maximum ambient temperature allowed is 30°C.
11. The maximum output air temperature allowed is 50°C.
Maintenance
No maintenance is required, except for a periodic functional test and retightening of the mains supply terminals, at least
once a year.
Overheating
If the overheating cut-out with manual reset has been activated, the following should be observed:
1. Only authorized electricians are allowed to remove the lid.
2. The mains supply voltage must be switched off.
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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