Preventing Overfilling With Fuel; Burn-Back Protection Device (Rhe); Reignition Protection (Rzs); Temperature And Flame Monitor (Tüf, Füf) - Viessmann VITOFLEX 300-UF Technical Manual

Design information
Extinguishing device with cold water supply
For part no., see pricelist
A B
A Combustion
B Dosing container with barrier layer
KW Cold water supply DN 15 ½"
min. 2.0 bar (0.2 MPa), max. 3.0 bar (0.3 MPa)
Note
■ The lines must be secured in metal pipes (½").
■ It must not be possible to shut off the cold water supply without the
aid of tools.

Preventing overfilling with fuel

To avoid overfilling the combustion chamber, install a fill level moni-
tor in accordance with TRVB H-118. The light barrier installed in the
boiler is used for this purpose.

Burn-back protection device (RHE)

A sensor located directly on the feed pipe detects any sign of burn-
back risk. Briefly increasing the output (increasing the infeed of the
material) counteracts the risk in good time.

Reignition protection (RZS)

In accordance with TRVB H-118 and EN 303-5, automatic wood
combustion systems in which there is a risk of reignition due to a
shower of sparks or the ignition of combustible gases flowing back
into the conveyor pipe must be equipped with reignition protection.
Protection against solid fuel boiler reignition
■ Permanent and monitored barrier layer
■ Permanent monitored negative pressure operation
■ Combination with the RSE (rotary lock valve or shut-off gate valve)
Temperature and flame monitor (TÜF, FÜF)
In accordance with TRVB H-118, the solid fuel boiler is monitored for
falling below the temperature limit. If the initial burn does not
develop, the system is stopped.
VITOFLEX 300-UF
(cont.)
KW
KW
A B
Note
Alternative or additional safety equipment
A shut-off gate valve is standard for an unpressurised material store
or a rotary lock valve for a material store with overpressure (charging
with fan, e.g. wood processing operations).
By combining with the fuel overfill protection, activation of any speci-
fied protection device is prevented and standard mode is maintained
to ensure extremely reliable heat supply.
Note
The RSE is not included in the standard delivery and must be
ordered separately.
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Viesmann
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