Operating Phases - Viessmann VITOFLEX 300-UF Operating Instructions Manual

Appliance description
■ Operating instructions
The operating instructions form part of this product.
All persons working with the product must have read
and understood the contents of these operating
instructions. Pass on the operating instructions to
every user.
■ Integration into an overall system
The Vitoflex 300-UF is part of an overall system. The
boiler's sensors and drive units are connected to the
system control unit via the electrical installation. The
heating system installation links the boiler to the
heating system circuit. The energy generated is sup-
plied to the consumers.

Operating phases

In automatic mode, the boiler enters the following
operating phases. The current operating phase is dis-
played on the programming unit.
The order of the operating phases normally follows the
sequence from "OFF" to "Burnout".
■ Off
The system is switched off.
■ Flush comb. chamber
The combustion chamber is flushed with fresh air so
that sufficient fresh air is available for combustion.
With each normal cycle, the combustion chamber is
purged with ambient air.
■ Fill hopper
The feed screw conveyor is filled with fuel.
The hopper is filled up.
Combustion chamber, fill screw conveyor
■
Fuel is transported into the combustion chamber for
a set duration.
■ Ignition
The ignition system is in operation. The control unit
monitors ignition.
■ Load
The system is in heating mode.
■ Maintaining
If the flow temperature rises above the "Firebed
maintenance ON" value, the boiler switches to the
"Maintaining" operating phase. Output is reduced
and fuel is supplied in a pre-selected amount.
If the flow temperature drops below the "Firebed
maintenance OFF" value, the boiler switches to the
"Load" operating phase.
Commissioning
The commissioning and adjusting of the control unit to
local conditions and to building characteristics must be
carried out by Viessmann Holzheiztechnik GmbH or by
a qualified contractor authorised by Viessmann.
(cont.)
Run screw conveyor until empty
■
After the selected temperature has been reached or
the system has been switched off via the program-
ming unit or due to a fault, a controlled system shut-
down takes place.
The remaining fuel in the feed screw conveyor is
added to the combustion chamber.
■ Burnout
After burnout the control unit switches into operating
phase "OFF".
Exception: A switchover to the "Emergency burnout"
operating phase occurs in the case of faults.
■ Standby ON - OFF
The system is off; the start button is preselected.
■ Emergency burnout
The system has been switched off automatically as a
result of one of the following faults:
"O2 measurement fault"
–
– "Vacuum pressure measurement fault"
– "Fault, combustion chamber sensor"
The feed is run until empty.
After burnout the control unit switches into operating
phase "OFF".
Introductory information
9