Bedienungsanleitung Wodtke Family.nrg (Seite 29 von 68) (Englisch)

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Manual_S5_Airplus_2015_04_20 Page 29 / 68

9.4 wodtke Air Volume Sensor

An air volume sensor sits in the central air intake

which measures the current flow velocity of the

combustion air in the intake, compares it to the tar-

get value specifications and, in case of deviations,

automatically corrects the speed of the exhaust

fan up or down. This allows the unit to automati-

cally adjust itself within the possible adjustment

range to changes to the chimney draft, changes to

the internal resistances (e.g. due to contamination

of the hot gas flues or the burner pot) and differing

resistance in the air intake. The unit is thus always

supplied with the optimal air volume.

Note:

In the case of differing draft ratios in the chimney

and differing air temperatures, the wodtke air vol-

ume sensor can also cause differences in the

flame pattern because the fan speed necessarily

changes. This is completely normal, however, and

does not represent a defect. Instead, this provides

for optimal combustion.

The air volume sensor also responds if the door of

the unit is opened, and interrupts the pellet feed.

This, together with the additional contact switch of

the combustion chamber door, prevents operation

with the door open and the units are classified as

type 1 (self-closing door).

The temperature of the air volume sensor (TL) in

the intake is also measured via the air volume sen-

sor. If this temperature is above the target value,

the unit is switched to fault. The same occurs if the

temperature rises too quickly (gradient).

9.5 Pellet chute temperature sen-

sor (TP)

A temperature sensor sits directly in the pellet

chute and monitors the temperature to the pellet

container. If the target temperature stored in the

programme is exceeded, a safety shut-down of

the unit occurs. The unit can only be reactivated

following sufficient cooling.

If the sensor should be defective and require re-

placing, the adjusting stop ring (A) of the defective

sensor must be installed on the new sensor. Push

the adjusting stop ring of the old sensor over the

new sensor and position precisely (22 mm from

the sensor tip), as measurement errors can other-

wise occur. Never install sensor without the adjust-

ing stop ring! Tighten all adjusting screws by hand

only (not with force / screwdriver) as the sensor

can otherwise be damaged.

Fig. 54: TP sensor

9.6 Flue Gas Temperature Sen-

sor (TR)

A temperature sensor sits directly in the flue gas

(above the deflection plate of the combustion

chamber) and monitors the temperature for igni-

tion and continuous operation. After starting, it is

monitored here whether the ignition was success-

ful. If no more pellets are supplied (e.g. container

empty), this is also detected via this TR sensor

and the unit shuts down. When operating with pel-

lets having a heat value / bulk density that is too

high, the output released from the unit can be

above the rated heating output. This is also de-

tected and balanced by the TR. The unit modu-

lates to low-load until the specified values are up-

held again.

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