SDHE.040219
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3
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Installation in the supply air duct
(post heater)
1. Installation
The air heater must be installed in the supply air duct.
Make sure that the flow direction is correct (marked
with an arrow on the air heater). The air heater must
not be installed with the service hatch cover directed
downwards, all other positions are acceptable.
The supply air temperature sensor must be installed in
the air flow after the heater. (min. distance from the
heater is 5 x duct diameter)
NOTE!
The air heater and supply air duct must be
insulated if they are conducted through cold space.
Insulation must be designed according to national re-
gulations, with nonflammamble insulation for example
mineral wool. The insulation may not cover the lid as the
specification plate and warning sign must be visible and
the lid must be accessible for opening.
• Connect SET connection module
(4)
to the ventila-
tion unit
(1)
by connecting the RJ45 cables to the
SET1 and SET2 connectors.
• Install a 0...10V control cable*
(A)
to the heater
(2)
and
connect it to the AO2 connector in SET module
(4)
.
• Install temperature sensor
(5)
to the supply air duct
(min. distance from the heater is 5 x duct diameter).
Connect sensor to the T6, T7, T8 or T9 connector in
SET module
(4)
.
• Connect the power cord via fuse protection and a
service switch*
(3)
to the air heater. The system is
a fixed installation, which means that an electrical
inspection of the connection must be made.
• Install any actuators for duct dampers according to the
manufacturer’s instructions and connect the control
cables to the SET connection module’s relay outputs.
*) Not included.
NOTE!
If the SET module is used for 230 VAC control,
the module must be installed, according to the electri-
cal safety directives, in a separate enclosure.
NOTE!
Make sure that the strain relief is arranged for the
connections according to the electrical safety directives.
2. Electric and control cables
Smart Extension Temperature module
Sensor
T6 T7
T8 T9
Smart unit
SET2 SET1
DI
max 50 VDC
NC NC NC
1 2 3 4 5 6 7 8 9 10 11 12
max 250 V / 6 A
Relay 1
4 3 2 1
max 250 V / 6 A
Relay 2
NC
4 3 2 1
AO3
AO2
AO1
NC
NC NC
SET
1
1
0
230V
2
3
4
5
5
6 7
8
12
AO2
AO1
O1
A
5
3. Commissioning
The commissioning of the air heater is performed with
a Smart control panel.
Main menu/Settings/(1234)/
Heating / cooling.
External electric post heater
Put the air heater for post heating into service from the
menu option
Ext. electric postheater
.
Supply air temperature sensor
Select T6, T7, T8 or T9 to be used as supply air tempera-
ture sensor, depending on which connector the sensor
is connected. The choice is made from
Sensors / controls
menu.
Relay control functions
If you wish to use relay control functions, e.g. for a duct
damper, the SET unit’s relays can be programmed for
the required function from the
Sensors / controls
menu
.
4. Use
Once the air heater has been commissioned it works auto-
matically and maintains optimal ventilation unit efficiency
.
The ventilation unit’s automatic control system controls
and monitors the function of the air heater. If a fault
occur on the heater, this is indicated by the alarm
Elect.
postheater fail
.
The heater is equipped with over temperature protecti-
on, which is located inside the air heater. If an overhea-
ting protection with manual reset trips, it can be reset
by pressing a button on the air heater.
NOTE!
Check why the overheating protection tripped
before resetting the fault.
5. Service
NOTE!
Disconnect the power to air heater and ventilati-
on unit before servicing.
Service should always be carried out on the air heater and
the filter when servicing the ventilation unit. Check that
dirt has not collected in the air heater, clean if necessary.
