Connection to mains
Fitting
Maintenance
Overheating
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 rating 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. The duct heater has a built in electronic 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, EMC-marked and designed in accordance with the following standards:
SEMKO 111 FA 1982 /
/ EN 61000-6-2
.
7. The duct heater is equipped with 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. Since the sensor circuitry, for heaters type MQEM/MQEML and MQU/MQUL, is not galvanic separated from the power
supply, care must be taken when sensors and set value adjuster are connected due to the mains voltage level.
10.
EN 60335-1 / EN 60335-2-30
/ EN 61000-6-3 / EN 61000-3-11
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.
.
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 indicated by the arrow on the side of the connection box.
3. The heater can be fitted in either horizontal or vertical ducting. The heater may only be fitted in ducts that are made of
incombustible and heat-and-cold resistant material. The connection box can be freely placed facing upwards or sideways
to a maximum angle of 90°. Fitting with the connection box facing downwards is
allowed.
NOT
4. The access opening to a room must be equipped with a fixed mesh or an intake air device which makes it im-
possible to touch the heating elements.
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 will be uneven which can cause
activation of the overheating cut-out.
Example: CV 16 result in a distance of at least 320mm, CV 40 result in a distance of at least 800mm, etc.
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. Furthermore, the insulation must not cover any heatsinks, nor the side of the
connection box where the SCR’s (Triac’s) are mounted.
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
30mm.
10.
.
11.
.
NOT
The maximum ambient temperature allowed is 30°C
The maximum output air temperature allowed is 50°C
No maintenance is required, except for a periodic functional test.
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.
10
CV
