IV Continuous product development may give rise to specification changes without notice. 2014-11-042 (2)
Product sheet
Operation and MaintenanceFlexomix MIE-EL
Operation and Maintenance
Instructions
The heating coil consists of “unsheathed” electric
heating rods. A substantial accumulation of dust or
other impurities on the heating rods will cause them
to overheat. This could shorten their service life. This
might also entail an odour of burnt dust and in the
worse case, the risk of fire.
Overheated electric heating rods may become
deformed or loosen from their suspension fasteners
and heat the air unevenly.
Inspection
Check that the electric heating rods are correctly posi-
tioned and that they are not deformed in any way.
Cleaning
Vacuum or wipe surfaces with a moist cloth to remove
any dust or impurities.
Function
1. Simulate reduced required output by temporarily
lowering the temperature setting (setpoint), so that
all the electric output steps (contactors) switch out.
2. Then sharply increase the setpoint setting and
check that the electric output steps switch in.
3. Restore the temperature setting.
4. Stop the air handling unit (NB: Do not break the
circuit with the safety switch). All the electric
output steps should switch out (i.e. the contac-
tors in the OFF position). Stopping the unit may
be delayed approximately 2–5 minutes to allow
the fans to cool the heat energy stored in the air
heater.
The electric heater is equipped with dual temperature
limiters. The one that resets itself automatically should
be set to 70 °C.
The overheat protection with manual reset interrupts
operation when the heater reaches approximately
120°C and is located on the cover panel on the side
of the heater. Determine the cause of overheating
and take corrective action before you reset the
protection device.
Please note that the risk of overheating increases as
the air flow through the unit decreases. The air speed
should not be lower than 1.5 m/s.
Wiring instructions
Electric heater without control system (HT)
Ø 1
Ø 2 Overheat protection with automatic reset.
Ø 3
Ø 4 Overheat protection with manual reset.
Ø 5
Ø 6
Ø 7
Connecting the first step: 0,2-3,5 kW 2-phase 400 V.
NB: For output power > 3.5 kW the first step is 3-phase 400 V.
Ø
Ø
Ø
Connecting the second step: 3.6-43 kW 3-phase 400 V
Ø
Ø
Ø
Connecting the third step: 3.6-43 kW 3-phase 400 V
Ø
Ø
Ø
Connecting the fourth step: 3.6-43 kW 3-phase 400 V
Output steps to be connected sequentially, beginning at
terminal no 5.
If any output group exceeds 43 kW, it must be divided into
two groups of an equal size.
Electric heater with integrated control (HS)
Y
G0
PE
L3
L2
L1
L
N
PE
+
–
1
2
3
4
NC
NO
POWER SUPPLY
3×400V~
CONTROL
0-10V=
OPERATION
1×230V~
ALARM (CLOSES
BETWEEN 3-4 IN
EVENT OF ALARM)
