Swegon TBLA Installation Instructions Manual
GB.TBLAMT.141001
Swegon reserves the right to alter specifications.
www.swegon.com 1
Installation Instructions for the TBLA Air Heater with
Thermo Guard frost damage protection, GOLD/SILVER C
1. General
The TBLA air heater uses hot water as the heating medium
for post-heating the supply air.
Finned-tube heat exchanger fabricated of copper tubes
and profiled aluminium fins. The headers and the pipework to the water connections are made of copper. The
male threaded pipe connections are made of brass.
Extra accessories
GOLD:
The TBVL valve set with 2(3)-way valve, actuator, connection cable with quick-fit connector, frost guard sensor
(insertion type), and T-piece (for air heaters without outlet
for an insertion sensor). See the individual instructions for
the TBVL valve set.
If you use a valve of your own, you have the option of
instead selecting a set of electrical connection components. This set contains a connection cable with quick-fit
connector, resistor and insertion or strap-on sensor.
SILVER C:
The TBVA Valve set consisting of a 2(3)-way valve including actuator can be ordered. See the instructions for
TBVA accessories. If the air heater/cooler is to be installed
outdoors or in a cold space, take into consideration the
enclosure class of the actuator and the permissible ambient temperature. If necessary, ensure that the required
protection is arranged.
2. Maintenance
Check at least twice a year whether cleaning is necessary.
Cleaning shall only be done by blowing with compressed
air against the ordinary direction of airflow, vacuum cleaning with a soft nozzle or wet cleaning with water and/or
solvent. Before you begin wet cleaning, you should cover
adjacent functional sections to protect them. After wet
cleaning, you should blow the surfaces dry with compressed air to remove every trace of cleaning solvent.
If cleaning solvent is used, this solvent must not contain
ingredients that will corrode aluminium or copper. Swegon’s cleaning agent is recommended. This cleaning agent
is sold by Swegon or Swegon Service.
While cleaning, check whether the liquid circuit needs to
be vented.
GB.TBLAMT.141001
Swegon reserves the right to alter specifications.
2 www.swegon.com
3. Installation
For the installation of air heaters in duct systems, see the
individual instructions entitled: Installation Instructions for
Duct Accessories.
The capacity of the air heater with Thermo Guard is independent on the direction of airflow through the air heater.
See Fig. 1.
The return pipe must always be connected to the connection marked Thermo Guard. See figure. 2.
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 connection. Vent the system before you commission it.
The supply flow temperature should be between 55-70°C.
The available pump pressure must not be higher than 25
kPa if the inlet flow temperature is higher than 65°C. If
the inlet flow temperature is between 55°C and 65°C, the
available pump pressure should be between 12–40 kPa.
If the inlet flow pressure substantially exceeds the recommended pressure, a pressure limiting device, which
reduces the pressure to the recommended level, may be
necessary.
A pressure limiting device should not be installed in ventilation systems that utilize hot water supplied from a district heating plant, since such a device could contribute to
high recirculated water temperatures.
4. Operation
Thermo Guard frost damage protection
Frost damages in the air heater most often cause the tube
bends to burst.
Research has shown that the tubes in the air stream are
the first ones to freeze. When an ice plug forms inside a
tube, it expands longitudinally along the tube and this
increases the water pressure in the bend causing it to
burst. Hence, it is not the ice itself that causes the bend
to burst, but the high water pressure in the bend brought
about by the ice inside the tube.
Thermo Guard frost-damage-protected air heaters operate
according to the principle that involves relieving abnormal
pressure rise in tube bends by draining water from the
tube bends to the return pipe of the air heater.
This enables the air heater to cope with freezing without
damage. However it is important to note that possible
valves installed in the return pipeline must not be closed
since doing so will put the Thermo Guard function out of
action.
Thermo Guard frost damage protection is the only one of
its kind on the market that offers frost damage protection
in the event of a power failure and similar service disruptions.
Fig. 1
TBLA connections with Thermo Guard
Thermo
Guard
Swegon
Thermo Guard
connection
T piece
Frost guard sensor
Shut-off valve (must not be
closed if freezing is likely –
to relieve pressure).
Pressure limiting device,
if required
Heating
water
Shut-off valve
Control
valve
Fig. 2
AB
A
5. Electrical connections
For particulars of the electrical connections of the valve
actuator and circulation pump, see the separate instructions for the TBVL/TBVA valve kit.
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