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STDITR01ADP2090EV TECNOFRIGO TUSCANY srl
Steam connections
Check that the stop valves are installed and closed before connecting the steam heating
coil to a steam source.
Ensure that the flanges are sealed and secured before connecting the steam heating coil
to a steam source.
CAUTION! The steam pipes must be connected by qualified personnel according to local
regulations.
ATTENZIONE! The system must be designed so that the condensation of the steam is
conveyed by gravity into an open condensate tank, which a vacuum breaker is installed in.
This is very important for the life of the steam heating coil. Any condensate remaining within
the heating coil will damage the unit the next time it is started.
Recommended installation.
It is necessary to install the following components as part of the circuit of the steam source so as to
ensure a proper functioning of the system (see example figure below).
A droplet separator for the removal of contaminants and fluids in the inlet steam. The separator
removes fluids that may have a detrimental effect on the surface of heat transfer and also cause
damage by erosion.
To adjust the flow of steam through the heating coil is used a control valve of steam. For all types
of control valves, it is important that they open slowly to reduce the risk of hydraulic shocks,
thermal effects and erosion that can damage the heat exchanger. We recommend using a steam
logarithmic control valve to slow the action of opening. The valve actuator must have an opening
time of not less than 120 seconds.
If a valve is used to control the modulation of the steam, keep in mind that the pressure drop in
the valve affects the pressure of the steam to the heating coil and consequently on the
temperature that can be achieved. Keep in mind this consideration when designing a control
valve.
You must install a vacuum breaker on the input in order to convey the steam condensation when
the unit is shut down or used at low power.
The condensate drain must be of type float, preferably with a integral thermal deaerator and a
filter for dirt. You cannot use drains thermostats.
In the line of the condensate return it is necessary to install a non-return valve to prevent the
entry of the condensate in the heating battery and any malfunctioning of the condensate system.
This measure is necessary when the line of the condensate return receives the condensate from
the most drainages with different pressures and temperatures as well as to prevent a return flow
when the level of condensate in the condensate tank increases.
To compensate for the thermal expansion, it is required the presence of curves of expansion in
the inlet and outlet tubes. All lines must be decompressed individually near the dehumidifier to
reduce the load on the steam heating coil.
In the event of a risk of freezing, it is necessary to install a thermostat immediately after the
heating coil in the direction of airflow. If the temperature drops below +7°C, the thermostat
detects a risk of freezing and therefore stops the dehumidifier unit so that the reactivation air
flow is interrupted and an audible alarm starts to sound.
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