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Spartherm Nova E H2O Manual

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GB 12
2.8 THERMAL DISCHARGE SAFETY DEVICE
As the heating of the Nova E H2O is not automatic, nor can it be quickly
shut-off, the hot water insert must be equipped with a thermal discharge
safety device in accordance with DIN 4751 - Part 2 and DIN EN 12828 to
avoid dangerous situations in the case of malfunction, such as a power
outage. For this, a safety device (safety heat exchanger) is integrated in
the Nova E H2O to prevent overheating. This safety device must not be used
as a water heater. The provided thermal discharge safety device (e.g. SYR,
type 3065) has been tested and approved for a minimum water throughput
of 900 kg/h. The connection can be executed in accordance with Fig. 2. The
sensor of the capillary tube must be pushed into the appropriately marked
connection opening of the Nova E H2O (into the sealed-in immersion sleeve)
and permanently fixed in place.
The following instructions must always be complied with for the installation,
so that the safety device can function:
• For the installation, the instructions in the installation and operating
manual for the thermal discharge safety device provided by the manu-
facturer must always be complied with!
• The fitting of the thermal discharge safety device must only be installed
in the flow line, so that when operated as intended, standing water is not
present in the safety heat exchanger.
• The fitting of the thermal discharge safety device must not be housed
in the hot area of the heating chamber (convection chamber) of the fire-
place system (max. ambient temperature 80°C). Select the position of
the fitting in accordance with the capillary tube length so that it is easily
accessible, should it be necessary to replace the fitting for example!
• At the cold water inlet, a flow pressure of at least 2.0 bar
must be available. This pressure must be constantly ensured.
The possibility of water network fluctuations must be excluded.
For example, this means that a mains voltage-dependent domestic water
supply is not approved!
A separate safety valve must also be installed, if such a safety valve is
installed at a different point in the entire system (comply with TRD 721!)
2.7 RETURN FLOW TEMPERATURE BOOST
The Nova E H2O must only be operated with a return flow boost. In operation,
the return flow temperature must be at least 60°C to prevent damage to
the boiler parts.
Likewise, sooting of the fireplace insert, as well as faster contamination
are also prevented. To ensure a temperature of at least 60°C, a circulation
pump/return flow temperature boost must be installed in such a manner that
it only starts up when a temperature of approx. 62°C has been reached. This
is ensured if a pump thermostat (Afriso, type GTK 7HD) is used. As there
is a danger of undershooting the dew point, a regulated return flow boost
must be installed. In this regard, the control variable - this equals the effec-
tive return flow temperature at the inlet of the water heat exchanger - is
detected and adjusted to the desired value.
The return flow temperature boost should be installed in the direct vicinity
of the heat generator, so that the phase of dew point undershooting at the
flue gas water heat exchanger is kept as short as possible. However, it must
be noted that with installation of the circulation pump within the heating
chamber, operating noises are perceptible.
Please note: For operating malfunctions or corrosion damage (sooting,
deposits, etc.) on the water heat exchanger or chimney, etc. that are
attributed to a missing return flow boost or non-effective return flow boost,
we can accept neither liability nor guarantee.
… 12 …


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Spartherm Nova E H2O User Manual - German - 28 pages

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