SDHW. 180118
03/06/2015 Swegon reserves the right to make changes.
3
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3.1. Installation of the air heater in the
duct system
The air heater must be installed in the supply air duct.
The ducts are connected to the air heater’s Ø125 mm
or Ø160 mm connection sleeves. The air heater is
supported either with the help of a shelf or another
approved manner. The weight of the air heater in an
operating state is about 5.5 kg. The ducts are pushed
into the sleeves and locked with pop rivets. Keep in
mind that the ducts’ insulation must run right up to the
unit. In cold areas the incoming duct must thermally
insulated after the air heater using 10 cm mineral wool
(general instruction).
The air heater can be installed in horizontal or vertical
ducts with optional direction of airflow.
3. Installation
Separate air heater for installation in ducts, utilises the
heating circuit’s water. Can be used in the supply air
duct to heat the room air.
Heating control can be fully transferred to the CASA
Smart control technology.
1. General Description
2. Planning
To observe during planning: when sizing the pump and
pipe system, find out the heating net’s temperature
and flow and the air heater’s pressure loss. Swegon
recommends its own heating pipe system for air
heaters. Take the pressure loss caused by the air
heater into consideration when sizing the airflows and
selection of the ventilation unit.
A shut-off damper must be installed in the outdoor
duct. The shut-off damper’s relay control is taken from a
SET connection unit.
3.2. Water connection
The following must be taken into consideration when
the air heater is connected to the pipe system:
1. Compression couplings are to be used to connect
the air heater. Valve connection with threaded
couplings: 2-way valve (½" female thread, kvs 0.4)
Belimo R3015-P4-S1
2. The air heater’s connection pipes must not be
subjected to distortion or bending movements
when the connections are made. Counterhold with
a tool when assembling the couplings. The valve’s
actuator can be mounted horizontally or so that the
actuator is above the pipe system.
3. Ensure that the unit’s expansion forces or the pipe
system’s own weight does not load the connections
on the air heater.
4. To facilitate venting of the air heater, water is
generally supplied through the lowermost pipe on
the heater. The venting valve is normally placed on
the air heater or at the unit’s highest point. Heating
pipes must be fitted with filters.
5. The air heater must be connected so that the pipe
system can be drained easily, for example, during
repairs, extended periods of downtime or when
there is a risk of freezing.
6. The air heater and its connections must be checked
for leakage once the pipe system has been
completely filled with water. Any leakage can cause
water damage.
