1 Install the pre-heater in the duct with a minimum of 2 x
the duct diameter from a duct bend, filter unit, or other
objects that can cause turbulence in the airflow.
For products with circular duct connections, do these
steps:
a. Put the duct on the duct joint of duct heater. Pull the
duct over the rubber rings on the duct joint on duct
heater.
b. Use self drilling screws to attach the duct to the duct
joint.
For products with rectangular duct connections, do these
steps:
a. Install the pre-heater on the duct using guide rails.
Guide rails are not supplied by Systemair.
b. Put fireproof insulation on the pre-heater in accord-
ance with local regulations for ventilation ducts.
2 Install the supplied duct sensor (1) in the duct.
a. Use a drill to make a hole for the supplied sensor in
the outdoor air duct.
b. Make sure that the distance between the hole and
the pre-heater (2) is minimum 1.5 m.
c. Put the sensor in the hole, adjust the length and at-
tach the sensor with the supplied screws.
3.3 To use the manual overheat
reset
Warning
Do not touch the heater, there is a risk of
injury.
The duct heater is equipped with manual overheating reset.
The overheat protection is designed to prevent overheating
when the airflow is too low, or if there is a fault in the system.
If the manual overheat protection is released, do these steps:
1 Turn off the power supply and wait until the heater is cool.
2 Investigate the reason for the released overheat
protection.
3 When the problem has been removed, push the over-
heat protection reset button, refer to 1.3 Product over-
view CB and 1.4 Product overview RB.
3