6.5 Water connection
Heating connections
Existing systems
Before connecting to an existing heating system, thoroughly flush the
wood boiler to remove dirt and sludge.
Otherwise, these dirt and sludge residues will be deposited in the boiler
and can lead to local overheating, noise and corrosion. Boiler damage
caused by such deposits is excluded from our warranty. Where nec-
essary, install dirt traps.
Connections on the heating water side
On the customer side, it is necessary to ensure that there is a water
supply independent of the power supply. This (redundant) design
guarantees that the boiler is reliably cooled in the event of a power
failure via the thermally activated safety valve. We also refer to the
standards and regulations listed in this document.
Connect all heat consumers and heating circuits to the boiler flow and
return connectors. Never make any connections to the safety flow or
to other connections.
We recommend you install shut-off valves into the heating flow and
return lines, so that the entire water content will not have to be drained
if work is required on the wood boiler or the heating circuits.
Easy installation
For safety temperatures up to 110 ºC, the boiler requires no inter-
mediate flow piece for the connection of safety equipment.
All connections required for the various pieces of equipment, e.g. for
water level or pressure limiters, are provided on the boiler.
Boiler circuit and shunt pumps
In order to reliably prevent boiler corrosion caused by flue gas con-
densation, the boiler return temperature must never fall below 65 °C.
The boiler has variable output control. This requires a constant boiler
flow rate of the water to be heated. The boiler circuit with boiler pump
and boiler mixer should therefore be installed in accordance with the
sizing recommendations.
The sizing of the boiler circuit should be carried out in such a way that
the temperature differential between the flow and return is 15 °C or
smaller. The control of the boiler pump and boiler control valve is inte-
grated in the control unit supplied.
Safety equipment to DIN EN 12828
The safety equipment of the heating installation should be carried out
by the authorised heating installer.
EN 12828 applies to the design of DHW heating systems with safety
temperatures up to max. 110 ºC.
This standard contains safety requirements laid down for boilers and
boiler systems.
■ Sealed expansion vessel
■ A safety valve at the highest point of the boiler or a pipe connected
to the boiler
■ The pipework between the boiler and the safety valve must not be
able to be shut off. Pumps, fittings or restrictions must not be present
in this pipework
■ The discharge pipe should be constructed so as to prevent the pos-
sibility of increases in pressure. Any expelled heating water must be
able to be drained off safely. Arrange the outlet of the discharge pipe
so that any water expelled from the safety valve can be safely
observed and drained off
■ A low water indicator is not required, except in attic heating centres
(water level limiter available as an accessory)
■ Thermometer and pressure gauge
System example
General information
■ In order to reliably prevent boiler corrosion caused by flue gas con-
densation, the boiler return temperature must never fall below 65 °C.
A boiler circuit pump with boiler mixer should be provided with in
accordance with the system scheme
■ The sizing of the boiler circuit should be carried out in such a way
that the temperature differential between the flow and return is
15 °C or smaller
■ Integrating heat consumers
■ The expansion vessel must be connected to the boiler, without shut-
off devices, via the boiler flow
Design information
(cont.)
PYROT
45
5822 516 GB
6
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