Viessmann Vitoflex 300-UF Series Installation And Operating Instructions Manual page 36

Mechanical
Appliance Description
Legend
Safety heat exchanger
A
B Flame tube
Heat exchanger
C
DE Flue outlets
Up to 720 kilowatts: 1 flue outlet, centre
From 950 kilowatts: 1 flue outlet, left or righthand
side (alternative flue outlet is closed off)
Drain outlet
F
Ignition fan connection
G
H Connection, primary air fan 2
Drive, infeed grate
K
L Feed screw conveyor
M Ash removal screw conveyor
Infeed grate
N
O Ash collector trough
36
(continued)
Vitoflex 300-UF Installation & Operating
Controller
The system controller regulates and controls the
combustion system and all associated components.
Fuel supply
The feed system transports fuel from below into the
combustion retort. A feed screw conveyor is installed
at the side for this purpose.
Infeed grate
Burning fuel is pushed out of the combustion retort onto
the sloping grate and from there onto the infeed grate.
The infeed grate has moving parts which can transport
the spent fuel towards the ash removal area.
Ash removal
The infeed grate pushes ash into the ash trough. From
here, an ash removal screw conveyor transports the
ash out of the combustion chamber.
Boiler safety equipment
The heat exchanger contains a high limit safety cut-out
(HLSC) and water pressure switches (positive and/or
vacuum pressure).
Positive pressure limiters are installed in the combustion
chamber.
In the fuel supply area, safety limit switches are installed
on the inspection covers.
Burn-back protection
Burn-back protection on the feed screw conveyor is
provided either by a shut-off gate valve or a rotary lock
valve. The type of locking device used depends on the
position and size of the fuel store and the pressure
conditions in the fuel transport system. An extinguishing
device is also installed which floods the feed screw
conveyor with water when a selectable response
temperature is reached.
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 with the
control panel via the electrical installation. The heating
system installation links the boiler to the heating system
circuit. The energy generated is supplied to the
consumers.