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accumulation tank to ensure comfortable heating and a maximal utilization of the heat energy. Heating systems
with forced circulation can be secured against overheating e.g. via an open expansion tank or cooling loop. In
case of electricity outage it is recommended to use a backup supply for the circulation pump. We recommend
equipping heaters with thermostatic heads (especially in the area where the fireplace stove is located).
Heating systems with forced circulation are susceptible to overheating, most often due to power outages. If
the circulation pump stops, the water temperature in the exchanger will start to raise rapidly, since the heat is not
being drained anymore. Fischer strongly recommends installing one of the systems for preventing the
overheating of heating systems.
Recommended systems for preventing the overheating of heating systems:
Cooling loop – in case of a power outage and if the exchanger heats up above a safe bound, the
cooling vent will release cold water from the water supply into the loop located in the exchanger. The
cold water will drain the heat from the exchanger into waste water (see Connection chart with
cooling loop).
DBV cooling valve – in case of power outage and if the exchanger heats up above a safe bound, the
overheated water is drained as waste water and cold water is released simultaneously into the heating
system (see Connection chart with DBV cooling valve).
Backup generator – allows the pump to operate for a short while during power outages to let the
fireplace insert to cool off.
Warning: The cooling exchanger (loop) and the DBV cooling valve are designed to fully protect the
exchanger against overheating. Its proper operation and connection is conditioned by a cold water intake with a
permanent minimal pressure of 2 bars and temperature of up to 15°C, i.e. the water supply must not depend on
power outages (preferably the water system). Cooling water from the cooling exchanger is drained as waste
water.
Securing the heating system against high pressure
We recommend using a safety valve for securing the heating system against high pressure. It is placed on the
hot water outlet from the exchanger. No closable piping may be installed between the exchanger and the safety
valve. The maximal distance of the safety valve from the source is 20xDN. The safety valve should be easily
accessible to allow regular inspection of functionality.
Installation of this safety valve is a required condition for the warranty of fireplace stoves with a warm
water exchanger.
Protecting the exchanger from low-temperature corrosion
To prevent the creation of condensate on the walls of the exchanger, it is necessary to always equip the
heating system of warm water fireplace stoves with a thermostat mixing valve, which keeps the water
temperature at the inlet to the exchanger at a minimal value of 65°C. Protection from low-temperature corrosion
will increase the service life of the exchanger. To improve the heat-up and combustion phases in forced systems,
we recommend installing a switchable thermostat for the pump.
Installation of thermostat exchanger valve is a required condition for the warranty of fireplace stoves
with a warm water exchanger.
Warning: The outlet vent must be installed in the lowest part of the heating system.
Warning: The fireplace stove with exchanger may not be used without connection to the warm water system
and when not filled with the heat carrying medium, i.e. water or frost-resistant filling recommended for this
purpose. These fillings must adhere to norm ČSN 07 7401/1992 (Water and steam for thermal energy
equipment) to keep a long service life.
5. Operation manual
5.1 Fuel
It is only allowed to burn wood and wood briquettes in fireplace stoves in accordance with law 201/2012. To
reach the nominal parameters of the heater, we recommend using dry logs with a diameter of 5-8 cm and length
of 20-30 cm and with a humidity below 20% (ideally 10%). Oven wood and chopped pieces of wood should be
used only when starting the fire. Recommended humidity can be obtained by storing the chopped logs for at
least two years in a ventilated shelter.
The fireplace stove should be heated to a nominal output stated in the technical sheet, i.e. the burning of a
given amount of allowed fuel per 1 hour. Long-term excessive output could damage the fireplace stove.
Never use flammable fluids, coke, coal or any of the following types of waste as fuel: chipboards,
plastics, plastic bags, soaked wood or wood-shavings, saw-dust or pellets!
!!!Burning of the abovementioned material not only highly pollutes our environment but also damages
the fireplace stove and the chimney!!!
5.2 Starting the fireplace stove for the first time
Before the first use all remaining stickers must be removed, all accessories must be taken out of the ashpan or
fireplace and the same applies for the transport safety pins. Check that bulk shutters for directing the draft,
chamotte tiles and the barrier are set correctly (as they might have slipped from their correct positions during
transport or installation). Repair any defects you might find in setting, otherwise the proper functioning of the
heater is endangered. After setting the fireplace stove, connecting it to the chimney and, if need be, connecting
the exchanger to the warm-water set and filling it with a heat-carrying medium, start heating slowly and
continue for at least one hour. Leave the stoves and ashpan doors open (approx 1-2mm) before and during the
first heating in order to prevent the sealing material to mix with the paint. The fireplace surface is covered with
heat-resistant paint. During the first heating, after becoming temporarily soft, the paint will eventually become
hardened. During the soft phase the paint surface is more vulnerable to being damaged by a hand or other object.
During the first heating the fireplace stove should be "heated up" with a small flame, burning only a small
amount of fuel with a lower temperature. All materials must get used to the heat load. You will prevent cracks in
chamotte bricks, damage of the paint or deformation of the insert materials by a careful first heating. Hardening
of the paint on the fireplace stove might be accompanied by a temporary smell, which will disappear after a
while.
Make sure the room is properly aired when burning the paint. Furthermore, ensure that no small
animals or birds are present in the room containing paint exhausts. We also recommend turning off
aquariums air intakes during the first heating.
5.3 Kindling and firing
1. Fireplace stoves with grate - first put crumpled paper into the chamber and then lay chopped wood on it.
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