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3. Installation
For the installation of air heaters for preheat in duct sys-
tems, see the individual instructions entitled: Installation
Instructions for Duct Accessories.
Always connect the liquid circuit for counter-flow circula-
tion to ensure optimal air heater performance. Connect
the inlet water pipe to the upper or lower air heater con-
nection depending on the direction of airflow. See Fig. 1.
Make sure that the frost guard connection is always near-
est to the return water pipe connection (applicable to air
heaters with rectangular connections).
Fig. 1
Connection for
1)
frost guard sensor
(applies to air heat-
ers with rectangu-
lar connections)
Fig. 2
Pipe connection example
Applicable to air heaters
with circular connections
T piece
Frost guard sensor
Commission-
ing valve
Non-return valve
Secondary pump
Frost guard sensor. Applicable to air heaters with
rectangular connections
2
www.swegon.com
1)
1)
2(3)-way valve
Shut-off valve
A
AB
B
Heating
water
Shut-off valve
To install the frost guard sensor:
Circular connections:
The frost guard sensor must be mounted on the return
water pipe from the air heater, as near to the air heater
as possible. A T-piece is supplied with the air heater for
installing an insertion sensor. See fig. 2 and 3. Make sure
that the frost guard sensor is protected to prevent inad-
vertent damage. This can be done, for example, by fitting
a pipe extension piece to the air heater's outgoing header.
Rectangular connections:
Install the frost guard sensor on the air heater in the con-
nection intended for an insertion sensor. See Fig. 1.
Fig. 3
Swegon reserves the right to alter specifications.
GB.TBLF.170215
Measuring element, sensor
T piece
Cable gland
Spacer nut for adjusting the
insertion depth.
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