Manual ATTACK DPX Combi Pellet (page 16 of 100) (English)

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2.4.9 BOILER PROTECTION AGAINST OVERHEATING

Each gasification boiler must be equipped with functional

cooling circuit. The right valve to provide the feature can

be ordered as an accessory. The correct installation of the

cooling circuit valve can be seen in pic. on the right.

WARNING! Following the norm EN 303–5, the

aftercooling circuit against the boiler overheat-

ing must not be used for other purposes than

boiler protection against overheating.

The valve at the cold water inlet into the cooling loop

must be permanently open and the cooling loop of the

boiler must be connected to the functional cold water

distribution (e.g. to the cold water supply into the water

distribution network) with the temperature of 10 – 15 °C

and the operating overpressure of 2 – 6 bar. This valve also

ensure safe operation even in power cut.

The STS20 valve at outlet of the cooling loop with the sen-

sor placed in the rear part of the boiler protects the boiler in the following way. When the tem-

perature of water in the boiler exceeds 95 °C, then the water from the distribution network flows

into the cooling loop to absorb the surplus heat. In the case of boiler overheating and opening

the STS20 valve it is necessary to ensure the permanent outtake of the warmed water from the

boiler aftercooling circuit into the drain.

Functionality of aftercooling circuit and thermostatic valve can be tested each time manually,

with the manual button of the thermostatic valve.

WARNING! If the outtake of cooling water through the cooling loop is not ensured

after opening the STS20 valve, there is a danger of boiler damage! In this case is the

warranty for the boiler not valid!

2.4.10 CONNECTION TO THE ACCUMULATION TANKS

Connection system consists in heating of accumulation tanks heat. Accumulated heat of the ac-

cumulation tanks is gradually taken according to requirements into heated space. When is the

boiler operating at full output, the storage tanks are heated to 80 – 90 °C. Heating with accumu-

lation tanks in connection with the boiler ATTACK DPX COMBI Pellet brings several advantages.

Highlights include the longer boiler life, cleaner operation and minimal creation of acid and

condensate, less frequently of fuel loading, higher comfort, less possibility of overheating of the

boiler and lower fuel consumption.

Recommended capacity of accumulation tank for boiler ATTACK DPX COMBI Pellet is 50 l per

1 kW boiler output, the minimum capacity is 25 l per 1 kW boiler output. When choosing

a capacity of accumulation tank, it is necessary to have on mind that the size of the accumula-

tion tank affects on operation of the boiler. That means, we load the boiler regarding to the size

of accumulation tank to prevent overheating of the system.

Therefore is very important to have on mind that the boiler needs to be load always just with

enough wood, to heat up the accumulation tank, but not overheat. There may be to remove the

surplus heat to waste. This is uneconomical and requires activation of safety element – aftercool-

ing circuit.

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ATTACK DPX Combi Pellet Manual

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