Bulex Thema Condens AS 48-A, Руководство пользователя, Страница: 46 / 199

MAKSİCONDENSE 48-65
Notes
01/2018 40 Training 0020260859_00
3.1.4.4 New! Space heater fan
41
–48 kW Pabst Fan
65 kW Pabst Fan
The purpose of the fan is to route the oxygen required for combustion to the burner and to release
the flue gases created by combustion into the atmosphere. The pressure generated when pumping
the volume flow is required to overcome the pressure losses of the air/flue pipe and combustion
chamber and to control the gas-air mixture.
The power of the fan and the diameter of the flue accessories determine the maximum possible
length of the air/flue pipe. Unit output falls slightly as the pressure loss increases (greater resistance)
in the flue system due to the dependency of the fan flow rate on the gas volume.
The speed range of the fan can be restricted. The maximum speed can be decreased under diag-
nostics code "D.051" and the minimum speed can be increased under diagnostics code "D.050".
Changing the factory setting is only required in exceptional cases. The current fan speed can be
read under "D.033" (target value) and "D.034" (actual value).
Heat exchanger freeze protection (fan speed deviation)
If cold combustion air of e.g. -
10 °C is blown from the fan via the primary heat ex-
changer, without the burner being in operation, frost damage may occur in the pri-
mary heat exchanger. To ensure that this fault cannot occur, the following proce-
dure must be followed. If the electronics do not receive a rotational speed signal
within 20 seconds of the "Fan on" target signal, the fan is switched off for 10 sec-
onds. Display
"S.32" . A further two start-up attempts are then carried out. Then
"F.32" . The speed deviation here is > 500 rpm.
This fault can also occur, if:

The fan motor or hall sensor is defective,

The plug is loose or not inserted,

Electronics defective