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3. Installation
For the installation of air heaters in duct systems, 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.
See to it that the frost guard connection, if fitted, always is
nearest to the return liquid connection.
Use a pipe wrench to restrain the pipe connections of the
air heater when tightening the external pipe connections
to avoid damaging the tubes in the air heater.
Always fill the air heater with liquid from the lower con-
nection. Vent the system before you commission it.
The supply flow temperature should be between 55-70°C.
Continuous circulation through the air heater is required
whenever the outdoor temperature is low, to ensure
satisfactory anti-freeze monitor function in the air heater.
A secondary pump and non-return valve must therefore be
installed as illustrated in Fig. 2. A pump kit consisting of a
pump, non-return valve and commissioning valve is avail-
able as an accessory.
4. Electrical connections
For particulars of the electrical connections of the valve
actuator and circulation pump, see the separate instruc-
tions for the TBVL/TBVA valve kit.
2
www.swegon.com
Fig. 1
Connection for a
1)
frost guard sensor,
if required
Fig. 2
Pipe connection example
Installion of frost guard sensor in the con-
nection for an insertion sensor (if any)
Commission-
ing valve
Non-return valve
Secondary pump
Frost guard sensor.
Installation of frost guard sensor if the air heater
lacks a connection for an insertion sensor
T-piece
Adjustment
valve
Non-return valve
Secondary pump
Swegon reserves the right to alter specifications.
GB.TBLA.180307
1)
1)
Shut-off valve
2(3)-way valve
A
AB
B
Heating
water
Shut-off valve
2(3)-way valve
Shut-off valve
Frost guard
sensor
A
AB
B
Heating
water
Shut-off valve
Measuring element, sensor
T-piece
Spacer nut for adjusting the
insertion depth.
Cable gland
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