hergom DERO SE Installation, Use And Maintenance Instructions page 20

3.2 Installation with closed expansion tank and underfloor heating - outline
A Valve
B Minimum thermometer
C Circulator
D Closed expansion vessel
E Bleeder
F Safety valve (3 BAR)
G Tank
H Auto filling and anti-backflow valve
When installing the radiators, do not place area
thermostat valves on all radiators. Part of the insta-
llations (radiators) must always be open to enable
the heater to dissipate any overheating or overs-
peed.
It is obligatory to install a safety valve set at a
pressure of 3 Bar. The installation must be filled at a
pressure of 1 bar.
It is mandatory to include an expansion vessel
(open or closed) in the installation
It is advisable to install a thermostat that will cut
the circulator whenever the water in the boiler is
below 50ºC. This will avoid condensation when ligh-
J Emptying valve
K Adjustment
L 3-way mixing valve
M Temperature Probe
N Safety thermostat at 45 °C
P Underfloor Heating
R Thermal security valve
ting the heater.
It is advisable for all installation components
(safety valve, circulator, expansion vessel...) to be
installed on the backflow.
Industrias Hergom S.A. declines all liability connec-
ted with the installation. The installer must comply
with local regulations in order to install the system
correctly.
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