hergom DERO, Installation, Use And Maintenance Instructions

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1 - INTRODUCTION
IMPORTANT! All local regulations, including those
that refer to national or European regulations,
must be applied when installing this device.
The way the DERO fireplace is installed will decisively
affect safety issues and its correct operation.
It is important to install the fireplace correctly. For
the correct installation of the DERO and chimney,
we recommend the installation be performed by a
professional.
THE DERO stove has an output of 34,9 kW (21 kW
power transferred to water and 14,9 kW of power
transferred to the environment).
2 - ASSEMBLY
SCHEMATIC VIEW OF CIVIL WORK
• VERSION “A”: CONVECTION with outside air
intake (clean air).
• VERSION “B”: CONVECTION taking the air from
inside the premises (recirculation of same air).
VERSION “A”
Thermostatic safety valve and coil
Depending on your model, the stove can be fitted
with a safety system so that, in the event of any pump
failure in the water circuit, it will eliminate excess
temperature. This safety system uses a probe (not
supplied) that measures the temperature of the
water inside the boiler. If it reaches a temperature
of 97°C, it automatically opens the valve, allowing
cold water from the general network to enter
through the coil.
The coil is an accesory.
The accessory coil doesn’t include the thermostatic
valve.
The probe that activates the discharge valve is
located in the ¾’’ sleeve as shown in the figure
below. Depending on the probe, the ¾” sleeve on
the right can also be used.
It is not advisable to use the coil to produce
domestic hot water.
Although it is chosen to install the coil, it is
advisable to install a thermal valve 95-97 ° C. This
will prevent excessive rise in temperature inside
the pan evacuating hot water to a drain.
NOTE TO INSTALLER:
The rated working pressure is 1 to 1.5 bar. The
tightness of the boiler has been verified at the
factory to 5 bar.
When installing the coil check for leaks at pressure
from 3 bar.
Before connecting the fireplace to the water heater
check that the latter is sealed at a pressure of 3.5
VERSION “B”
IMPORTANT! The ventilation grills of the cap have
to be placed so that they are not stopped.
The air that goes out of the top ventilation grills
can reach high temperatures, do not use materials
that do not resist to the heat in the zone of exit of
the grills. They have to be, in addition, metallic,
do not use grills of wood or plastic.
Do not place objects near the top grills of
ventilation. The warm air that goes out of them
can ruin them.
The minimum recommended size of the grids is
400 cm² free passage of air, one at the bottom and
one at the top of the coating as shown in figure.
3 - INSTRUCTIONS FOR INSTALLING THE
FIREPLACE