Handleiding Spartherm Nova E H2O (pagina 14 van 28) (Engels)

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controller is approximately 500 W at alternating current AC 230.

The factory settings of the thermostat have been pre-set to approximately

62°C. With this pre-set, the switch-on temperature and switch-off

temperature of the circulation pump of the return flow boost are defined

when the necessary water temperature in the water heat exchanger

is reached or undershot. Optionally, if the conditions so require, the

temperature can be adjusted by the installation company. For this, depend-

ing on the version of the thermostat, the rotary adjuster is adjusted, or the

cover (D=10 mm) is taken off. After removing the cover, the temperature

range can be changed. The pump thermostat must not be housed in the hot

area of the heating chamber (convection chamber) of the fireplace system

(max. ambient temperature 80°C). Select the position in accordance with

the capillary tube length in the cold area!

Please note: At water temperatures below 60°C the danger of undershooting

the dew point increases! This can cause gloss soot. In addition, the clean-

ing interval is shortened. Consequently, we recommend that the switch-on

temperature is not to be set below 60°C and not above 68°C. For some

heating systems, it can be necessary to install a flue gas thermostat in

addition to the pump thermostat. This prevents the buffer tank from cool-

ing above the tiled stove insert. Ask the installation company if there are

questions in this regard

2.10 INTEGRATION IN A HEATING SYSTEM

Please note: The Nova E H2O must only be installed in an overall system

after detailed planning of the overall heating system in accordance with the

relevant rules of technology and the safety standards. The proper configura-

tion of the pumps, fittings, pipeline, buffer tank and the safety components,

such as safety valve and expansion tank, is the responsibility of the planning

firm and/or of the executing installation company. Bear in mind that during

the combustion phase, extremely high water throughput of approx. 25 kW

can briefly occur. The heating installations must be configured accordingly,

among other things.

The following sample calculation can be helpful for dimensioning the buffer

tank:

The following assumptions have been made in this regard:

• PSize of the buffer tank: 500 l (approx. 500 kg water)

• Water temperature in the buffer tank at the beginning: 30 °C

• Water temperature in the buffer tank at the end: 60 °C

• Temperature differential 30 °C (corresponds to 30 K))

• No heat withdrawal from the buffer tank during warm-up by the Nova E

H2O and no heat losses from the syste

This means: To heat up 500 litres of water in a buffer tank, from an assumed

30°C to 60°C a theoretical heat quantity of 62805 kJ (= 62805 kWs) is

required (losses or heat withdrawals in the system have not been taken into

account). This heat quantity corresponds to approx. 17.5 kWh. However,

with an effective setup of the heating system, e.g. of a stratified storage

tank, the heat utilisation can begin shortly after start of circulation in the

Nova E H2O. In this case, only the excess energy will be stored in the buffer

tank, not the energy required for heating.

At an average assumed power of approx. 9 kW of the Nova E H2O, heat-up

of the entire buffer tank takes just under 2 hours.

On extremely cold winter days, it is possible that the fireplace system may

also be in operation for approximately 12 hours. In this case, the thermal

energy thus produced is theoretically 93 kWh. This thermal energy would

then be sufficient to heat just under 2,666 litres of water (from 30°C to

60°C). As a rule, in such a situation heat is also continuously withdrawn so

that overloading of the buffer tank (> 90°C) should not occur.

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